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Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1i4FGO-0002jz-ND; Sun, 01 Sep 2019 02:06:44 +0000 Received: from vps.xff.cz ([195.181.215.36]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1i4FGJ-0002in-5b for linux-arm-kernel@lists.infradead.org; Sun, 01 Sep 2019 02:06:42 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=megous.com; s=mail; t=1567303590; bh=7KhoTyooAwT5WgVvu2mnLRyLJZxigkAs46qZpESqWnY=; h=Date:From:To:Cc:Subject:References:X-My-GPG-KeyId:From; b=pjILNVNFTzHnNm0cAJTzluqDMnONzOe2A7r2s/aUYMOgNUKB1Z7gqcveOdSyHpsvG nMv4+4c7nVRzNxeLPGwHFMY49sBfn+qKPtlPb+c4zeZObKFUAfSnmWANLhd18hgCxZ ZTXu9XUWJD4YfD2ERuk50dMx1b0xWp5bWaRRhxlc= Date: Sun, 1 Sep 2019 04:06:29 +0200 From: =?utf-8?Q?Ond=C5=99ej?= Jirman To: Yangtao Li Subject: Re: [PATCH v5 01/18] thermal: sun8i: add thermal driver for h6 Message-ID: <20190901020629.lpzkmjpjs5wgu6e7@core.my.home> Mail-Followup-To: Yangtao Li , rui.zhang@intel.com, edubezval@gmail.com, daniel.lezcano@linaro.org, robh+dt@kernel.org, mark.rutland@arm.com, maxime.ripard@bootlin.com, wens@csie.org, mchehab+samsung@kernel.org, davem@davemloft.net, gregkh@linuxfoundation.org, Jonathan.Cameron@huawei.com, nicolas.ferre@microchip.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org References: <20190810052829.6032-1-tiny.windzz@gmail.com> <20190810052829.6032-2-tiny.windzz@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190810052829.6032-2-tiny.windzz@gmail.com> X-My-GPG-KeyId: EBFBDDE11FB918D44D1F56C1F9F0A873BE9777ED X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190831_190639_554375_889C87F5 X-CRM114-Status: GOOD ( 34.06 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, linux-pm@vger.kernel.org, maxime.ripard@bootlin.com, gregkh@linuxfoundation.org, daniel.lezcano@linaro.org, linux-kernel@vger.kernel.org, edubezval@gmail.com, wens@csie.org, robh+dt@kernel.org, Jonathan.Cameron@huawei.com, mchehab+samsung@kernel.org, rui.zhang@intel.com, davem@davemloft.net, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hello Yangtao, On Sat, Aug 10, 2019 at 05:28:12AM +0000, Yangtao Li 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. > > Signed-off-by: Yangtao Li > --- > MAINTAINERS | 7 + > drivers/thermal/Kconfig | 14 ++ > drivers/thermal/Makefile | 1 + > drivers/thermal/sun8i_thermal.c | 399 ++++++++++++++++++++++++++++++++ > 4 files changed, 421 insertions(+) > create mode 100644 drivers/thermal/sun8i_thermal.c > > diff --git a/MAINTAINERS b/MAINTAINERS > index 47800d32cfbc..89dc43f4064d 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -682,6 +682,13 @@ L: linux-crypto@vger.kernel.org > S: Maintained > F: drivers/crypto/sunxi-ss/ > > +ALLWINNER THERMAL DRIVER > +M: Yangtao Li > +L: linux-pm@vger.kernel.org > +S: Maintained > +F: Documentation/devicetree/bindings/thermal/sun8i-thermal.yaml > +F: drivers/thermal/sun8i_thermal.c > + > ALLWINNER VPU DRIVER > M: Maxime Ripard > M: Paul Kocialkowski > diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig > index 9966364a6deb..f8b73b32b92d 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 > + 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..2ce36fa3fec3 > --- /dev/null > +++ b/drivers/thermal/sun8i_thermal.c > @@ -0,0 +1,399 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Thermal sensor driver for Allwinner SOC > + * Copyright (C) 2019 Yangtao Li > + * > + * Based on the work of Icenowy Zheng > + * Based on the work of Ondrej Jirman > + * Based on the work of Josef Gajdusek > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +#define MAX_SENSOR_NUM 4 > + > +#define SUN50I_H6_SENSOR_NUM 2 > +#define SUN50I_H6_OFFSET -2794 > +#define SUN50I_H6_SCALE -67 > + > +#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; > +}; > + > +struct ths_device { > + struct device *dev; > + struct regmap *regmap; > + struct reset_control *reset; > + struct clk *bus_clk; > + struct tsensor sensor[MAX_SENSOR_NUM]; > +}; > + > +/* Temp Unit: millidegree Celsius */ > +static int sun8i_ths_reg2temp(struct ths_device *tmdev, > + int reg) > +{ > + return (reg + SUN50I_H6_OFFSET) * SUN50I_H6_SCALE; > +} > + > +static int sun8i_ths_get_temp(void *data, int *temp) > +{ > + struct tsensor *s = data; > + struct ths_device *tmdev = s->tmdev; > + int val; > + > + regmap_read(tmdev->regmap, SUN50I_H6_THS_TEMP_DATA + > + 0x4 * s->id, &val); > + > + /* ths have no data yet */ > + if (!val) > + return -EAGAIN; > + > + *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. > + */ > + *temp += SUN50I_H6_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) > +{ > + struct ths_device *tmdev = data; > + int i, state; > + > + regmap_read(tmdev->regmap, SUN50I_H6_THS_DIS, &state); > + > + for (i = 0; i < SUN50I_H6_SENSOR_NUM; i++) { > + > + 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)); > + > + thermal_zone_device_update(tmdev->sensor[i].tzd, > + THERMAL_EVENT_UNSPECIFIED); > + } > + } > + > + return IRQ_HANDLED; > +} > + > +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 * SUN50I_H6_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 < SUN50I_H6_SENSOR_NUM; i++) { > + int reg = (int)caldata[i + 1]; > + int sensor_temp = sun8i_ths_reg2temp(tmdev, reg); > + int delta, cdata, offset; > + > + /* > + * 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; > + } > + > + offset = (i % 2) << 4; > + regmap_update_bits(tmdev->regmap, > + SUN50I_H6_THS_TEMP_CALIB + ((i >> 1) * 4), > + 0xfff << offset, > + cdata << offset); > + } > + > +out_free: > + kfree(caldata); > +out: > + return ret; > +} > + > +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; > + > + 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); > + > + ret = reset_control_deassert(tmdev->reset); > + if (ret) > + return ret; > + > + ret = clk_prepare_enable(tmdev->bus_clk); > + if (ret) > + goto assert_reset; > + > + ret = sun50i_ths_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_h6_thermal_init(struct ths_device *tmdev) > +{ > + int val; > + > + /* > + * clkin = 24MHz > + * T acquire = clkin / (x + 1) > + * = 20us > + */ I suggest something along the lines of: /* * T_acq = 20us * clkin = 24MHz * * x = T_acq * clkin - 1 * = 479 */ Makes it much more clear how the value in SUN50I_THS_CTRL0_T_ACQ was arrived at and how to calculate a new one. > + 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 */ As above, here I suggest: /* * clkin = 24MHz * filter_samples = 4 * period = 0.25s * * x = period * clkin / 4096 / filter_samples - 1 * = 365 */ Also please change this to 365 from 58. I think 4 readings per second are enough. Certainly, 25 are a bit too much. > + regmap_write(tmdev->regmap, SUN50I_H6_THS_PC, > + SUN50I_H6_THS_PC_TEMP_PERIOD(58)); > + /* enable sensor */ > + val = GENMASK(SUN50I_H6_SENSOR_NUM - 1, 0); > + regmap_write(tmdev->regmap, SUN50I_H6_THS_ENABLE, val); > + /* thermal data interrupt enable */ > + val = GENMASK(SUN50I_H6_SENSOR_NUM - 1, 0); > + regmap_write(tmdev->regmap, SUN50I_H6_THS_DIC, val); > + > + return 0; > +} > + > +static int sun8i_ths_register(struct ths_device *tmdev) > +{ > + struct thermal_zone_device *tzd; > + int i; > + > + for (i = 0; i < SUN50I_H6_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); This should return PTR_ERR(tmdev->sensor[i].tzd). Otherwise this succeeds even if tz registration fails, and you get NULL pointer exception tryin to udpate nonexisting tz from the interrupt handler. regards, Ondrej > + } > + > + return 0; > +} > + > +static int sun8i_ths_probe(struct platform_device *pdev) > +{ > + struct ths_device *tmdev; > + struct device *dev = &pdev->dev; > + int ret, irq; > + > + tmdev = devm_kzalloc(dev, sizeof(*tmdev), GFP_KERNEL); > + if (!tmdev) > + return -ENOMEM; > + > + tmdev->dev = dev; > + platform_set_drvdata(pdev, tmdev); > + > + ret = sun8i_ths_resource_init(tmdev); > + if (ret) > + return ret; > + > + irq = platform_get_irq(pdev, 0); > + if (irq < 0) > + return irq; > + > + ret = sun50i_h6_thermal_init(tmdev); > + if (ret) > + return ret; > + > + ret = sun8i_ths_register(tmdev); > + if (ret) > + return ret; > + > + /* > + * Avoid entering the interrupt handler, the thermal device is not > + * registered yet, we deffer the registration of the interrupt to > + * the end. > + */ > + ret = devm_request_threaded_irq(dev, irq, NULL, > + sun50i_h6_irq_thread, > + IRQF_ONESHOT, "ths", 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 const struct of_device_id of_ths_match[] = { > + { .compatible = "allwinner,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"); > -- > 2.17.1 > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel