| Message ID | 20190623164206.7467-2-tiny.windzz@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | add thermal driver for h6 | expand |
Hello Yangtao, On Sun, Jun 23, 2019 at 12:41:56PM -0400, 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 <tiny.windzz@gmail.com> > --- > MAINTAINERS | 7 + > drivers/thermal/Kconfig | 14 ++ > drivers/thermal/Makefile | 1 + > drivers/thermal/sun8i_thermal.c | 405 ++++++++++++++++++++++++++++++++ > 4 files changed, 427 insertions(+) > create mode 100644 drivers/thermal/sun8i_thermal.c > > diff --git a/MAINTAINERS b/MAINTAINERS > index 36a84614d6c3..67e7fcfaded2 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -674,6 +674,13 @@ L: linux-crypto@vger.kernel.org > S: Maintained > F: drivers/crypto/sunxi-ss/ > > +ALLWINNER THERMAL DRIVER > +M: Yangtao Li <tiny.windzz@gmail.com> > +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 <maxime.ripard@bootlin.com> > M: Paul Kocialkowski <paul.kocialkowski@bootlin.com> > 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..d6918c62682b > --- /dev/null > +++ b/drivers/thermal/sun8i_thermal.c > @@ -0,0 +1,405 @@ > +// 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@aosc.io> > + * Based on the work of Ondrej Jirman <megous@megous.com> > + * Based on the work of Josef Gajdusek <atx@atx.name> > + */ > + > +#include <linux/clk.h> > +#include <linux/device.h> > +#include <linux/interrupt.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 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 -EBUSY; You should return -EAGAIN here to avoid the warning (failed to read out thermal zone (%d)) if you believe this error is temporary. regards, o. > + *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, 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 = SUN50I_H6_THS_TEMP_CALIB + (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_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_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(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); > + } > + > + 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_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
diff --git a/MAINTAINERS b/MAINTAINERS index 36a84614d6c3..67e7fcfaded2 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -674,6 +674,13 @@ L: linux-crypto@vger.kernel.org S: Maintained F: drivers/crypto/sunxi-ss/ +ALLWINNER THERMAL DRIVER +M: Yangtao Li <tiny.windzz@gmail.com> +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 <maxime.ripard@bootlin.com> M: Paul Kocialkowski <paul.kocialkowski@bootlin.com> 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..d6918c62682b --- /dev/null +++ b/drivers/thermal/sun8i_thermal.c @@ -0,0 +1,405 @@ +// 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@aosc.io> + * Based on the work of Ondrej Jirman <megous@megous.com> + * Based on the work of Josef Gajdusek <atx@atx.name> + */ + +#include <linux/clk.h> +#include <linux/device.h> +#include <linux/interrupt.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 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 -EBUSY; + + *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, 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 = SUN50I_H6_THS_TEMP_CALIB + (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_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_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(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); + } + + 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_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");
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 <tiny.windzz@gmail.com> --- MAINTAINERS | 7 + drivers/thermal/Kconfig | 14 ++ drivers/thermal/Makefile | 1 + drivers/thermal/sun8i_thermal.c | 405 ++++++++++++++++++++++++++++++++ 4 files changed, 427 insertions(+) create mode 100644 drivers/thermal/sun8i_thermal.c