From: Ondrej Jirman <[email protected]> This patch adds support for the sun8i thermal sensor on Allwinner H3 SoC.
Signed-off-by: Ondřej Jirman <[email protected]> --- v2: - removed incorrect use of SID driver in sun8i_ths - read calibration data directly from iomem - better explanation for the thermal sensor driver - dt documentation fixes - dropped unncecessary macros and init code reorganization - moved resource aquisition from init to probe function - deassert reset after clock rate is set, not before - enable irq after all other registers are configured --- drivers/thermal/Kconfig | 7 ++ drivers/thermal/Makefile | 1 + drivers/thermal/sun8i_ths.c | 260 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 268 insertions(+) create mode 100644 drivers/thermal/sun8i_ths.c diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index 2d702ca..d3209d9 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -351,6 +351,13 @@ config MTK_THERMAL Enable this option if you want to have support for thermal management controller present in Mediatek SoCs +config SUN8I_THS + tristate "Thermal sensor driver for Allwinner H3" + depends on MACH_SUN8I + depends on OF + help + Enable this to support thermal reporting on some newer Allwinner SoCs. + menu "Texas Instruments thermal drivers" depends on ARCH_HAS_BANDGAP || COMPILE_TEST depends on HAS_IOMEM diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index 10b07c1..7261ee8 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -51,3 +51,4 @@ obj-$(CONFIG_TEGRA_SOCTHERM) += tegra/ obj-$(CONFIG_HISI_THERMAL) += hisi_thermal.o obj-$(CONFIG_MTK_THERMAL) += mtk_thermal.o obj-$(CONFIG_GENERIC_ADC_THERMAL) += thermal-generic-adc.o +obj-$(CONFIG_SUN8I_THS) += sun8i_ths.o diff --git a/drivers/thermal/sun8i_ths.c b/drivers/thermal/sun8i_ths.c new file mode 100644 index 0000000..9ba0f96 --- /dev/null +++ b/drivers/thermal/sun8i_ths.c @@ -0,0 +1,260 @@ +/* + * Thermal sensor driver for Allwinner H3 SoC + * + * Copyright (C) 2016 Ondřej Jirman + * Based on the work of Josef Gajdusek <[email protected]> + * + * 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/clk.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/reset.h> +#include <linux/slab.h> +#include <linux/thermal.h> +#include <linux/printk.h> + +#define THS_H3_CTRL0 0x00 +#define THS_H3_CTRL2 0x40 +#define THS_H3_INT_CTRL 0x44 +#define THS_H3_STAT 0x48 +#define THS_H3_FILTER 0x70 +#define THS_H3_CDATA 0x74 +#define THS_H3_DATA 0x80 + +#define THS_H3_CTRL0_SENSOR_ACQ0(x) (x) +#define THS_H3_CTRL2_SENSE_EN BIT(0) +#define THS_H3_CTRL2_SENSOR_ACQ1(x) ((x) << 16) +#define THS_H3_INT_CTRL_DATA_IRQ_EN BIT(8) +#define THS_H3_INT_CTRL_THERMAL_PER(x) ((x) << 12) +#define THS_H3_STAT_DATA_IRQ_STS BIT(8) +#define THS_H3_FILTER_TYPE(x) ((x) << 0) +#define THS_H3_FILTER_EN BIT(2) + +#define THS_H3_CLK_IN 40000000 /* Hz */ +#define THS_H3_DATA_PERIOD 330 /* ms */ + +#define THS_H3_FILTER_TYPE_VALUE 2 /* average over 2^(n+1) samples */ +#define THS_H3_FILTER_DIV (1 << (THS_H3_FILTER_TYPE_VALUE + 1)) +#define THS_H3_INT_CTRL_THERMAL_PER_VALUE \ + (THS_H3_DATA_PERIOD * (THS_H3_CLK_IN / 1000) / THS_H3_FILTER_DIV / 4096 - 1) +#define THS_H3_CTRL0_SENSOR_ACQ0_VALUE 0x3f /* 16us */ +#define THS_H3_CTRL2_SENSOR_ACQ1_VALUE 0x3f + +struct sun8i_ths_data { + struct reset_control *reset; + struct clk *clk; + struct clk *busclk; + void __iomem *regs; + void __iomem *calreg; + struct thermal_zone_device *tzd; + u32 temp; +}; + +static int sun8i_ths_get_temp(void *_data, int *out) +{ + struct sun8i_ths_data *data = _data; + + if (data->temp == 0) + return -EINVAL; + + /* Formula and parameters from the Allwinner 3.4 kernel */ + *out = 217000 - (int)((data->temp * 1000000) / 8253); + return 0; +} + +static irqreturn_t sun8i_ths_irq_thread(int irq, void *_data) +{ + struct sun8i_ths_data *data = _data; + + writel(THS_H3_STAT_DATA_IRQ_STS, data->regs + THS_H3_STAT); + + data->temp = readl(data->regs + THS_H3_DATA); + if (data->temp) + thermal_zone_device_update(data->tzd); + + return IRQ_HANDLED; +} + +static void sun8i_ths_h3_init(struct sun8i_ths_data *data) +{ + u32 caldata; + + caldata = readl(data->calreg) & 0xfff; + if (caldata != 0) + writel(caldata, data->regs + THS_H3_CDATA); + + writel(THS_H3_CTRL0_SENSOR_ACQ0(THS_H3_CTRL0_SENSOR_ACQ0_VALUE), + data->regs + THS_H3_CTRL0); + writel(THS_H3_FILTER_EN | THS_H3_FILTER_TYPE(THS_H3_FILTER_TYPE_VALUE), + data->regs + THS_H3_FILTER); + writel(THS_H3_CTRL2_SENSOR_ACQ1(THS_H3_CTRL2_SENSOR_ACQ1_VALUE) | + THS_H3_CTRL2_SENSE_EN, + data->regs + THS_H3_CTRL2); + writel(THS_H3_INT_CTRL_THERMAL_PER(THS_H3_INT_CTRL_THERMAL_PER_VALUE) | + THS_H3_INT_CTRL_DATA_IRQ_EN, + data->regs + THS_H3_INT_CTRL); +} + +static const struct thermal_zone_of_device_ops sun8i_ths_thermal_ops = { + .get_temp = sun8i_ths_get_temp, +}; + +static int sun8i_ths_probe(struct platform_device *pdev) +{ + struct sun8i_ths_data *data; + struct resource *res; + int ret; + int irq; + + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, "no memory resources defined\n"); + return -EINVAL; + } + + data->regs = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(data->regs)) { + ret = PTR_ERR(data->regs); + dev_err(&pdev->dev, "failed to ioremap THS registers: %d\n", ret); + return ret; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (!res) { + dev_err(&pdev->dev, "no calibration data memory resource defined\n"); + return -EINVAL; + } + + data->calreg = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(data->calreg)) { + ret = PTR_ERR(data->calreg); + dev_err(&pdev->dev, "failed to ioremap THS registers: %d\n", ret); + return ret; + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_err(&pdev->dev, "failed to get IRQ: %d\n", irq); + return irq; + } + + ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, + sun8i_ths_irq_thread, IRQF_ONESHOT, + dev_name(&pdev->dev), data); + if (ret) + return ret; + + data->busclk = devm_clk_get(&pdev->dev, "ahb"); + if (IS_ERR(data->busclk)) { + ret = PTR_ERR(data->busclk); + dev_err(&pdev->dev, "failed to get ahb clk: %d\n", ret); + return ret; + } + + data->clk = devm_clk_get(&pdev->dev, "ths"); + if (IS_ERR(data->clk)) { + ret = PTR_ERR(data->clk); + dev_err(&pdev->dev, "failed to get ths clk: %d\n", ret); + return ret; + } + + data->reset = devm_reset_control_get(&pdev->dev, "ahb"); + if (IS_ERR(data->reset)) { + ret = PTR_ERR(data->reset); + dev_err(&pdev->dev, "failed to get reset: %d\n", ret); + return ret; + } + + ret = clk_prepare_enable(data->busclk); + if (ret) { + dev_err(&pdev->dev, "failed to enable bus clk: %d\n", ret); + return ret; + } + + ret = clk_prepare_enable(data->clk); + if (ret) { + dev_err(&pdev->dev, "failed to enable ths clk: %d\n", ret); + goto err_disable_bus; + } + + ret = clk_set_rate(data->clk, THS_H3_CLK_IN); + if (ret) + goto err_disable_ths; + + ret = reset_control_deassert(data->reset); + if (ret) { + dev_err(&pdev->dev, "reset deassert failed: %d\n", ret); + goto err_disable_ths; + } + + sun8i_ths_h3_init(data); + + data->tzd = thermal_zone_of_sensor_register(&pdev->dev, 0, data, + &sun8i_ths_thermal_ops); + if (IS_ERR(data->tzd)) { + ret = PTR_ERR(data->tzd); + dev_err(&pdev->dev, "failed to register thermal zone: %d\n", + ret); + goto err_assert_reset; + } + + platform_set_drvdata(pdev, data); + return 0; + +err_assert_reset: + reset_control_assert(data->reset); +err_disable_ths: + clk_disable_unprepare(data->clk); +err_disable_bus: + clk_disable_unprepare(data->busclk); + return ret; +} + +static int sun8i_ths_remove(struct platform_device *pdev) +{ + struct sun8i_ths_data *data = platform_get_drvdata(pdev); + + thermal_zone_of_sensor_unregister(&pdev->dev, data->tzd); + reset_control_assert(data->reset); + clk_disable_unprepare(data->clk); + clk_disable_unprepare(data->busclk); + return 0; +} + +static const struct of_device_id sun8i_ths_id_table[] = { + { .compatible = "allwinner,sun8i-h3-ths", }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, sun8i_ths_id_table); + +static struct platform_driver sun8i_ths_driver = { + .probe = sun8i_ths_probe, + .remove = sun8i_ths_remove, + .driver = { + .name = "sun8i_ths", + .of_match_table = sun8i_ths_id_table, + }, +}; + +module_platform_driver(sun8i_ths_driver); + +MODULE_AUTHOR("Ondřej Jirman <[email protected]>"); +MODULE_DESCRIPTION("Thermal sensor driver for Allwinner H3 SoC"); +MODULE_LICENSE("GPL v2"); -- 2.9.0
