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Date: Mon, 10 Jun 2019 16:29:58 -0700
From: Vasily Khoruzhick <anarsoul@...il.com>
To: Yangtao Li <tiny.windzz@...il.com>
Cc: rui.zhang@...el.com, Eduardo Valentin <edubezval@...il.com>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Maxime Ripard <maxime.ripard@...tlin.com>,
Chen-Yu Tsai <wens@...e.org>,
"David S. Miller" <davem@...emloft.net>,
Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Linus Walleij <linus.walleij@...aro.org>,
Nicolas Ferre <nicolas.ferre@...rochip.com>,
paulmck@...ux.ibm.com, devicetree <devicetree@...r.kernel.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
arm-linux <linux-arm-kernel@...ts.infradead.org>,
Linux PM <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v3 1/3] thermal: sun8i: add thermal driver for h6
On Sat, May 25, 2019 at 11:17 AM Yangtao Li <tiny.windzz@...il.com> wrote:
>
> This patch adds the support for allwinner thermal sensor, within
> allwinner SoC. It will register sensors for thermal framework
> and use device tree to bind cooling device.
Hi Yangtao,
Any plans on v4 of this series?
> Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
> ---
> MAINTAINERS | 7 +
> drivers/thermal/Kconfig | 14 +
> drivers/thermal/Makefile | 1 +
> drivers/thermal/sun8i_thermal.c | 437 ++++++++++++++++++++++++++++++++
> 4 files changed, 459 insertions(+)
> create mode 100644 drivers/thermal/sun8i_thermal.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 2336dd26ece4..d312f9eecf0d 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -674,6 +674,13 @@ L: linux-crypto@...r.kernel.org
> S: Maintained
> F: drivers/crypto/sunxi-ss/
>
> +ALLWINNER THERMAL DRIVER
> +M: Yangtao Li <tiny.windzz@...il.com>
> +L: linux-pm@...r.kernel.org
> +S: Maintained
> +F: Documentation/devicetree/bindings/thermal/sun8i-thermal.yaml
> +F: drivers/thermal/sun8i_thermal.c
> +
> ALLWINNER VPU DRIVER
> M: Maxime Ripard <maxime.ripard@...tlin.com>
> M: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> index 9966364a6deb..e5465053d66f 100644
> --- a/drivers/thermal/Kconfig
> +++ b/drivers/thermal/Kconfig
> @@ -262,6 +262,20 @@ config SPEAR_THERMAL
> Enable this to plug the SPEAr thermal sensor driver into the Linux
> thermal framework.
>
> +config SUN8I_THERMAL
> + tristate "Allwinner sun8i thermal driver"
> + depends on ARCH_SUNXI || COMPILE_TEST
> + depends on HAS_IOMEM
> + depends on NVMEM_SUNXI_SID
> + depends on OF
> + depends on RESET_CONTROLLER
> + help
> + Support for the sun8i thermal sensor driver into the Linux thermal
> + framework.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called sun8i-thermal.
> +
> config ROCKCHIP_THERMAL
> tristate "Rockchip thermal driver"
> depends on ARCH_ROCKCHIP || COMPILE_TEST
> diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
> index 74a37c7f847a..fa6f8b206281 100644
> --- a/drivers/thermal/Makefile
> +++ b/drivers/thermal/Makefile
> @@ -31,6 +31,7 @@ thermal_sys-$(CONFIG_DEVFREQ_THERMAL) += devfreq_cooling.o
> obj-y += broadcom/
> obj-$(CONFIG_THERMAL_MMIO) += thermal_mmio.o
> obj-$(CONFIG_SPEAR_THERMAL) += spear_thermal.o
> +obj-$(CONFIG_SUN8I_THERMAL) += sun8i_thermal.o
> obj-$(CONFIG_ROCKCHIP_THERMAL) += rockchip_thermal.o
> obj-$(CONFIG_RCAR_THERMAL) += rcar_thermal.o
> obj-$(CONFIG_RCAR_GEN3_THERMAL) += rcar_gen3_thermal.o
> diff --git a/drivers/thermal/sun8i_thermal.c b/drivers/thermal/sun8i_thermal.c
> new file mode 100644
> index 000000000000..a9cc2197f4cb
> --- /dev/null
> +++ b/drivers/thermal/sun8i_thermal.c
> @@ -0,0 +1,437 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Thermal sensor driver for Allwinner SOC
> + * Copyright (C) 2019 Yangtao Li
> + *
> + * Based on the work of Icenowy Zheng <icenowy@...c.io>
> + * Based on the work of Ondrej Jirman <megous@...ous.com>
> + * Based on the work of Josef Gajdusek <atx@....name>
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/device.h>
> +#include <linux/interrupt.h>
> +#include <linux/wait.h>
> +#include <linux/module.h>
> +#include <linux/nvmem-consumer.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/reset.h>
> +#include <linux/slab.h>
> +#include <linux/thermal.h>
> +
> +#define MAX_SENSOR_NUM 4
> +
> +#define FT_TEMP_MASK GENMASK(11, 0)
> +#define TEMP_CALIB_MASK GENMASK(11, 0)
> +#define TEMP_TO_REG 672
> +#define CALIBRATE_DEFAULT 0x800
> +
> +#define SUN50I_THS_CTRL0 0x00
> +#define SUN50I_H6_THS_ENABLE 0x04
> +#define SUN50I_H6_THS_PC 0x08
> +#define SUN50I_H6_THS_DIC 0x10
> +#define SUN50I_H6_THS_DIS 0x20
> +#define SUN50I_H6_THS_MFC 0x30
> +#define SUN50I_H6_THS_TEMP_CALIB 0xa0
> +#define SUN50I_H6_THS_TEMP_DATA 0xc0
> +
> +#define SUN50I_THS_CTRL0_T_ACQ(x) ((GENMASK(15, 0) & (x)) << 16)
> +#define SUN50I_THS_FILTER_EN BIT(2)
> +#define SUN50I_THS_FILTER_TYPE(x) (GENMASK(1, 0) & (x))
> +#define SUN50I_H6_THS_PC_TEMP_PERIOD(x) ((GENMASK(19, 0) & (x)) << 12)
> +#define SUN50I_H6_THS_DATA_IRQ_STS(x) BIT(x)
> +
> +/* millidegree celsius */
> +#define SUN50I_H6_FT_DEVIATION 7000
> +
> +struct ths_device;
> +
> +struct tsensor {
> + struct ths_device *tmdev;
> + struct thermal_zone_device *tzd;
> + int id;
> + wait_queue_head_t wait_queue;
> +};
> +
> +struct ths_thermal_chip {
> + int sensor_num;
> + int offset;
> + int scale;
> + int ft_deviation;
> + int temp_calib_base;
> + int temp_data_base;
> + int (*calibrate)(struct ths_device *tmdev);
> + int (*init)(struct ths_device *tmdev);
> + irqreturn_t (*irq_thread)(int irq, void *data);
> +};
> +
> +struct ths_device {
> + const struct ths_thermal_chip *chip;
> + struct device *dev;
> + struct regmap *regmap;
> + struct reset_control *reset;
> + struct clk *bus_clk;
> + struct tsensor sensor[MAX_SENSOR_NUM];
> + int data_ready;
> +};
> +
> +/* Temp Unit: millidegree Celsius */
> +static int sun8i_ths_reg2temp(struct ths_device *tmdev,
> + int reg)
> +{
> + return (reg + tmdev->chip->offset) * tmdev->chip->scale;
> +}
> +
> +static int sun8i_ths_get_temp(void *data, int *temp)
> +{
> + struct tsensor *s = data;
> + struct ths_device *tmdev = s->tmdev;
> + int val;
> +
> + wait_event(s->wait_queue, tmdev->data_ready & BIT(s->id));
> + tmdev->data_ready &= ~BIT(s->id);
> +
> + regmap_read(tmdev->regmap, tmdev->chip->temp_data_base +
> + 0x4 * s->id, &val);
> +
> + *temp = sun8i_ths_reg2temp(tmdev, val);
> + /*
> + * XX - According to the original sdk, there are some platforms(rarely)
> + * that add a fixed offset value after calculating the temperature
> + * value. We can't simply put it on the formula for calculating the
> + * temperature above, because the formula for calculating the
> + * temperature above is also used when the sensor is calibrated. If
> + * do this, the correct calibration formula is hard to know.
> + */
> + if (tmdev->chip->ft_deviation)
> + *temp += tmdev->chip->ft_deviation;
> +
> + return 0;
> +}
> +
> +static const struct thermal_zone_of_device_ops ths_ops = {
> + .get_temp = sun8i_ths_get_temp,
> +};
> +
> +static const struct regmap_config config = {
> + .reg_bits = 32,
> + .val_bits = 32,
> + .reg_stride = 4,
> + .fast_io = true,
> +};
> +
> +static irqreturn_t sun50i_h6_irq_thread(int irq, void *data)
> +{
> + wait_queue_head_t *data_wait;
> + struct ths_device *tmdev = data;
> + int i, state;
> +
> + regmap_read(tmdev->regmap, SUN50I_H6_THS_DIS, &state);
> +
> + for (i = 0; i < tmdev->chip->sensor_num; i++) {
> + data_wait = &tmdev->sensor[i].wait_queue;
> +
> + if (state & SUN50I_H6_THS_DATA_IRQ_STS(i)) {
> + /* clear data irq pending */
> + regmap_write(tmdev->regmap, SUN50I_H6_THS_DIS,
> + SUN50I_H6_THS_DATA_IRQ_STS(i));
> +
> + tmdev->data_ready |= BIT(i);
> + wake_up(data_wait);
> + }
> + }
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int sun8i_ths_resource_init(struct ths_device *tmdev)
> +{
> + struct device *dev = tmdev->dev;
> + struct platform_device *pdev = to_platform_device(dev);
> + struct resource *mem;
> + void __iomem *base;
> + int ret, irq;
> +
> + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + base = devm_ioremap_resource(dev, mem);
> + if (IS_ERR(base))
> + return PTR_ERR(base);
> +
> + tmdev->regmap = devm_regmap_init_mmio(dev, base, &config);
> + if (IS_ERR(tmdev->regmap))
> + return PTR_ERR(tmdev->regmap);
> +
> + tmdev->reset = devm_reset_control_get(dev, 0);
> + if (IS_ERR(tmdev->reset))
> + return PTR_ERR(tmdev->reset);
> +
> + tmdev->bus_clk = devm_clk_get(&pdev->dev, "bus");
> + if (IS_ERR(tmdev->bus_clk))
> + return PTR_ERR(tmdev->bus_clk);
> +
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0)
> + return irq;
> +
> + ret = devm_request_threaded_irq(dev, irq, NULL,
> + tmdev->chip->irq_thread,
> + IRQF_ONESHOT, "ths", tmdev);
> + if (ret)
> + return ret;
> +
> + ret = reset_control_deassert(tmdev->reset);
> + if (ret)
> + return ret;
> +
> + ret = clk_prepare_enable(tmdev->bus_clk);
> + if (ret)
> + goto assert_reset;
> +
> + ret = tmdev->chip->calibrate(tmdev);
> + if (ret)
> + goto bus_disable;
> +
> + return 0;
> +
> +bus_disable:
> + clk_disable_unprepare(tmdev->bus_clk);
> +assert_reset:
> + reset_control_assert(tmdev->reset);
> +
> + return ret;
> +}
> +
> +static int sun50i_ths_calibrate(struct ths_device *tmdev)
> +{
> + struct nvmem_cell *calcell;
> + struct device *dev = tmdev->dev;
> + u16 *caldata;
> + size_t callen;
> + int ft_temp;
> + int i, ret = 0;
> +
> + calcell = devm_nvmem_cell_get(dev, "calib");
> + if (IS_ERR(calcell)) {
> + if (PTR_ERR(calcell) == -EPROBE_DEFER)
> + return -EPROBE_DEFER;
> + /*
> + * Even if the external calibration data stored in sid is
> + * not accessible, the THS hardware can still work, although
> + * the data won't be so accurate.
> + *
> + * The default value of calibration register is 0x800 for
> + * every sensor, and the calibration value is usually 0x7xx
> + * or 0x8xx, so they won't be away from the default value
> + * for a lot.
> + *
> + * So here we do not return error if the calibartion data is
> + * not available, except the probe needs deferring.
> + */
> + goto out;
> + }
> +
> + caldata = nvmem_cell_read(calcell, &callen);
> + if (IS_ERR(caldata)) {
> + ret = PTR_ERR(caldata);
> + goto out;
> + }
> +
> + if (!caldata[0] || callen < 2 + 2 * tmdev->chip->sensor_num) {
> + ret = -EINVAL;
> + goto out_free;
> + }
> +
> + /*
> + * efuse layout:
> + *
> + * 0 11 16 32
> + * +-------+-------+-------+
> + * |temp| |sensor0|sensor1|
> + * +-------+-------+-------+
> + *
> + * The calibration data on the H6 is the ambient temperature and
> + * sensor values that are filled during the factory test stage.
> + *
> + * The unit of stored FT temperature is 0.1 degreee celusis.
> + * Through the stored ambient temperature and the data read
> + * by the sensor, after a certain calculation, the calibration
> + * value to be compensated can be obtained.
> + */
> + ft_temp = caldata[0] & FT_TEMP_MASK;
> +
> + for (i = 0; i < tmdev->chip->sensor_num; i++) {
> + int reg = (int)caldata[i + 1];
> + int sensor_temp = sun8i_ths_reg2temp(tmdev, reg);
> + int delta, cdata, calib_offest;
> +
> + /*
> + * To calculate the calibration value:
> + *
> + * X(in Celsius) = Ts - ft_temp
> + * delta = X * 10000 / TEMP_TO_REG
> + * cdata = CALIBRATE_DEFAULT - delta
> + *
> + * cdata: calibration value
> + */
> + delta = (sensor_temp - ft_temp * 100) * 10 / TEMP_TO_REG;
> + cdata = CALIBRATE_DEFAULT - delta;
> + if (cdata & ~TEMP_CALIB_MASK) {
> + /*
> + * Calibration value more than 12-bit, but calibration
> + * register is 12-bit. In this case, ths hardware can
> + * still work without calibration, although the data
> + * won't be so accurate.
> + */
> + dev_warn(dev, "sensor%d is not calibrated.\n", i);
> +
> + continue;
> + }
> +
> + calib_offest = tmdev->chip->temp_calib_base + (i / 2) * 0x4;
> +
> + if (i % 2) {
> + int val;
> +
> + regmap_read(tmdev->regmap, calib_offest, &val);
> + val = (val & TEMP_CALIB_MASK) | (cdata << 16);
> + regmap_write(tmdev->regmap, calib_offest, val);
> + } else {
> + regmap_write(tmdev->regmap, calib_offest, cdata);
> + }
> + }
> +
> +out_free:
> + kfree(caldata);
> +out:
> + return ret;
> +}
> +
> +static int sun8i_ths_register(struct ths_device *tmdev)
> +{
> + struct thermal_zone_device *tzd;
> + int i;
> +
> + for (i = 0; i < tmdev->chip->sensor_num; i++) {
> + tmdev->sensor[i].tmdev = tmdev;
> + tmdev->sensor[i].id = i;
> + tmdev->sensor[i].tzd =
> + devm_thermal_zone_of_sensor_register(tmdev->dev,
> + i,
> + &tmdev->sensor[i],
> + &ths_ops);
> + if (IS_ERR(tmdev->sensor[i].tzd))
> + return PTR_ERR(tzd);
> + }
> +
> + return 0;
> +}
> +
> +static int sun8i_ths_probe(struct platform_device *pdev)
> +{
> + struct ths_device *tmdev;
> + struct device *dev = &pdev->dev;
> + int i, ret;
> +
> + tmdev = devm_kzalloc(dev, sizeof(*tmdev), GFP_KERNEL);
> + if (!tmdev)
> + return -ENOMEM;
> +
> + tmdev->dev = dev;
> + tmdev->chip = of_device_get_match_data(&pdev->dev);
> + if (!tmdev->chip)
> + return -EINVAL;
> +
> + /*
> + * Initialize wait_queue in advance, to avoid calling wake_up
> + * before ths is registered in isr.
> + */
> + for (i = 0; i < tmdev->chip->sensor_num; i++)
> + init_waitqueue_head(&tmdev->sensor[i].wait_queue);
> +
> + platform_set_drvdata(pdev, tmdev);
> +
> + ret = sun8i_ths_resource_init(tmdev);
> + if (ret)
> + return ret;
> +
> + ret = tmdev->chip->init(tmdev);
> + if (ret)
> + return ret;
> +
> + ret = sun8i_ths_register(tmdev);
> + if (ret)
> + return ret;
> +
> + return ret;
> +}
> +
> +static int sun8i_ths_remove(struct platform_device *pdev)
> +{
> + struct ths_device *tmdev = platform_get_drvdata(pdev);
> +
> + clk_disable_unprepare(tmdev->bus_clk);
> + reset_control_assert(tmdev->reset);
> +
> + return 0;
> +}
> +
> +static int sun50i_thermal_init(struct ths_device *tmdev)
> +{
> + int val;
> +
> + /*
> + * clkin = 24MHz
> + * T acquire = clkin / (x + 1)
> + * = 20us
> + */
> + regmap_write(tmdev->regmap, SUN50I_THS_CTRL0,
> + SUN50I_THS_CTRL0_T_ACQ(479));
> + /* average over 4 samples */
> + regmap_write(tmdev->regmap, SUN50I_H6_THS_MFC,
> + SUN50I_THS_FILTER_EN |
> + SUN50I_THS_FILTER_TYPE(1));
> + /* period = (x + 1) * 4096 / clkin; ~10ms */
> + regmap_write(tmdev->regmap, SUN50I_H6_THS_PC,
> + SUN50I_H6_THS_PC_TEMP_PERIOD(58));
> + /* enable sensor */
> + val = GENMASK(tmdev->chip->sensor_num - 1, 0);
> + regmap_write(tmdev->regmap, SUN50I_H6_THS_ENABLE, val);
> + /* thermal data interrupt enable */
> + val = GENMASK(tmdev->chip->sensor_num - 1, 0);
> + regmap_write(tmdev->regmap, SUN50I_H6_THS_DIC, val);
> +
> + return 0;
> +}
> +
> +static const struct ths_thermal_chip sun50i_h6_ths = {
> + .sensor_num = 2,
> + .offset = -2794,
> + .scale = -67,
> + .ft_deviation = SUN50I_H6_FT_DEVIATION,
> + .temp_calib_base = SUN50I_H6_THS_TEMP_CALIB,
> + .temp_data_base = SUN50I_H6_THS_TEMP_DATA,
> + .calibrate = sun50i_ths_calibrate,
> + .init = sun50i_thermal_init,
> + .irq_thread = sun50i_h6_irq_thread,
> +};
> +
> +static const struct of_device_id of_ths_match[] = {
> + { .compatible = "allwinner,sun50i-h6-ths", .data = &sun50i_h6_ths },
> + { /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, of_ths_match);
> +
> +static struct platform_driver ths_driver = {
> + .probe = sun8i_ths_probe,
> + .remove = sun8i_ths_remove,
> + .driver = {
> + .name = "sun8i-thermal",
> + .of_match_table = of_ths_match,
> + },
> +};
> +module_platform_driver(ths_driver);
> +
> +MODULE_DESCRIPTION("Thermal sensor driver for Allwinner SOC");
> +MODULE_LICENSE("GPL v2");
> --
> 2.17.0
>
>
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