Date:	Wed, 18 Nov 2015 21:51:48 +0100
From:	Josef Gajdusek <atx@....name>
To:	linux-sunxi@...glegroups.com
Cc:	linux-clk@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org, gpatchesrdh@...as.com,
	mturquette@...aro.org, hdegoede@...hat.com, sboyd@...eaurora.org,
	mturquette@...libre.com, emilio@...pez.com.ar,
	linux@....linux.org.uk, edubezval@...il.com, rui.zhang@...el.com,
	wens@...e.org, maxime.ripard@...e-electrons.com,
	galak@...eaurora.org, ijc+devicetree@...lion.org.uk,
	mark.rutland@....com, pawel.moll@....com, robh+dt@...nel.org
Subject: [PATCH] thermal: Add support for Sunxi THS on the Allwinner H3

This patch adds support for the Sunxi thermal sensor on the Allwinner H3.
Also adds declaration of the H3 THS clock to clk-sunxi.c ignoring the
dividers as they are not continuous (clk-divider.c cannot be used as it
does not support setting an enable bit).
Should be easily extendable for the A33/A83T/... as they have similar but
not completely identical sensors.

Signed-off-by: Josef Gajdusek <atx@....name>
---
 Documentation/devicetree/bindings/clock/sunxi.txt  |   1 +
 .../devicetree/bindings/thermal/sunxi-ths.txt      |  24 ++
 arch/arm/boot/dts/sun8i-h3.dtsi                    |  27 +++
 drivers/clk/sunxi/clk-sunxi.c                      |  16 ++
 drivers/thermal/Kconfig                            |   7 +
 drivers/thermal/Makefile                           |   1 +
 drivers/thermal/sunxi_ths.c                        | 263 +++++++++++++++++++++
 7 files changed, 339 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/thermal/sunxi-ths.txt
 create mode 100644 drivers/thermal/sunxi_ths.c

diff --git a/Documentation/devicetree/bindings/clock/sunxi.txt b/Documentation/devicetree/bindings/clock/sunxi.txt
index 23e7bce..6d63b35 100644
--- a/Documentation/devicetree/bindings/clock/sunxi.txt
+++ b/Documentation/devicetree/bindings/clock/sunxi.txt
@@ -73,6 +73,7 @@ Required properties:
 	"allwinner,sun8i-h3-usb-clk" - for usb gates + resets on H3
 	"allwinner,sun9i-a80-usb-mod-clk" - for usb gates + resets on A80
 	"allwinner,sun9i-a80-usb-phy-clk" - for usb phy gates + resets on A80
+	"allwinner,sun8i-h3-ths-clk" - for THS on H3
 
 Required properties for all clocks:
 - reg : shall be the control register address for the clock.
diff --git a/Documentation/devicetree/bindings/thermal/sunxi-ths.txt b/Documentation/devicetree/bindings/thermal/sunxi-ths.txt
new file mode 100644
index 0000000..75c9211
--- /dev/null
+++ b/Documentation/devicetree/bindings/thermal/sunxi-ths.txt
@@ -0,0 +1,24 @@
+* sunxi THS
+
+Required properties:
+- compatible : "allwinner,sun8i-h3-ths"
+- reg : Address range of the thermal registers and location of the calibration
+        value
+- resets : Must contain an entry for each entry in reset-names.
+           see ../reset/reset.txt for details
+- reset-names : Must include the name "ahb"
+- clocks : Must contain an entry for each entry in clock-names.
+- clock-names : Must contain "ahb" for the bus gate and "ths" for the THS
+  clock
+
+Example:
+ths: ths@...25000 {
+	#thermal-sensor-cells = <0>;
+	compatible = "allwinner,sun8i-h3-ths";
+	reg = <0x01c25000 0x88>, <0x01c14234 0x4>;
+	interrupts = <GIC_SPI 63 IRQ_TYPE_LEVEL_HIGH>;
+	resets = <&bus_rst 136>;
+	reset-names = "ahb";
+	clocks = <&bus_gates 72>, <&ths_clk>;
+	clock-names = "ahb", "ths";
+};
diff --git a/arch/arm/boot/dts/sun8i-h3.dtsi b/arch/arm/boot/dts/sun8i-h3.dtsi
index 0faa38a..b82881d 100644
--- a/arch/arm/boot/dts/sun8i-h3.dtsi
+++ b/arch/arm/boot/dts/sun8i-h3.dtsi
@@ -77,6 +77,14 @@
 		};
 	};
 
+	thermal-zones {
+		cpu_thermal: cpu_thermal {
+			polling-delay-passive = <1000>;
+			polling-delay = <5000>;
+			thermal-sensors = <&ths 0>;
+		};
+	};
+
 	timer {
 		compatible = "arm,armv7-timer";
 		interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
@@ -236,6 +244,14 @@
 					"ahb1_ephy", "ahb1_dbg";
 		};
 
+		ths_clk: clk@...20074 {
+			#clock-cells = <0>;
+			compatible = "allwinner,sun8i-h3-ths-clk";
+			reg = <0x01c20074 0x4>;
+			clocks = <&osc24M>;
+			clock-output-names = "ths";
+		};
+
 		mmc0_clk: clk@...20088 {
 			#clock-cells = <1>;
 			compatible = "allwinner,sun4i-a10-mmc-clk";
@@ -522,6 +538,17 @@
 			interrupts = <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>;
 		};
 
+		ths: ths@...25000 {
+			#thermal-sensor-cells = <0>;
+			compatible = "allwinner,sun8i-h3-ths";
+			reg = <0x01c25000 0x88>, <0x01c14234 0x4>;
+			interrupts = <GIC_SPI 63 IRQ_TYPE_LEVEL_HIGH>;
+			resets = <&bus_rst 104>;
+			reset-names = "ahb";
+			clocks = <&bus_gates 72>, <&ths_clk>;
+			clock-names = "ahb", "ths";
+		};
+
 		uart0: serial@...28000 {
 			compatible = "snps,dw-apb-uart";
 			reg = <0x01c28000 0x400>;
diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c
index 6293c65..637401a 100644
--- a/drivers/clk/sunxi/clk-sunxi.c
+++ b/drivers/clk/sunxi/clk-sunxi.c
@@ -604,6 +604,13 @@ static void sun7i_a20_get_out_factors(u32 *freq, u32 parent_rate,
 	*p = calcp;
 }
 
+static void sun8i_h3_get_ths_factors(u32 *freq, u32 parent_rate,
+				      u8 *n, u8 *k, u8 *m, u8 *p)
+{
+	/* Ignore the dividers as they are not continuous */
+	*freq = parent_rate;
+}
+
 /**
  * sunxi_factors_clk_setup() - Setup function for factor clocks
  */
@@ -668,6 +675,8 @@ static struct clk_factors_config sun4i_apb1_config = {
 	.pwidth = 2,
 };
 
+static struct clk_factors_config sun8i_h3_ths_config = {};
+
 /* user manual says "n" but it's really "p" */
 static struct clk_factors_config sun7i_a20_out_config = {
 	.mshift = 8,
@@ -734,6 +743,12 @@ static const struct factors_data sun7i_a20_out_data __initconst = {
 	.getter = sun7i_a20_get_out_factors,
 };
 
+static const struct factors_data sun8i_h3_ths_data __initconst = {
+	.enable = 31,
+	.table = &sun8i_h3_ths_config,
+	.getter = sun8i_h3_get_ths_factors,
+};
+
 static struct clk * __init sunxi_factors_clk_setup(struct device_node *node,
 						   const struct factors_data *data)
 {
@@ -1127,6 +1142,7 @@ static const struct of_device_id clk_factors_match[] __initconst = {
 	{.compatible = "allwinner,sun5i-a13-ahb-clk", .data = &sun5i_a13_ahb_data,},
 	{.compatible = "allwinner,sun4i-a10-apb1-clk", .data = &sun4i_apb1_data,},
 	{.compatible = "allwinner,sun7i-a20-out-clk", .data = &sun7i_a20_out_data,},
+	{.compatible = "allwinner,sun8i-h3-ths-clk", .data = &sun8i_h3_ths_data,},
 	{}
 };
 
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index c463c89..0111d4d 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -365,6 +365,13 @@ config INTEL_PCH_THERMAL
 	  Thermal reporting device will provide temperature reading,
 	  programmable trip points and other information.
 
+config SUNXI_THS
+	tristate "Sunxi THS driver"
+	depends on ARCH_SUNXI
+	depends on OF
+	help
+	  Enable this to support thermal reporting on some newer Allwinner SoC.
+
 menu "Texas Instruments thermal drivers"
 depends on ARCH_HAS_BANDGAP || COMPILE_TEST
 source "drivers/thermal/ti-soc-thermal/Kconfig"
diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
index cfae6a6..3a25e3c 100644
--- a/drivers/thermal/Makefile
+++ b/drivers/thermal/Makefile
@@ -48,3 +48,4 @@ obj-$(CONFIG_INTEL_PCH_THERMAL)	+= intel_pch_thermal.o
 obj-$(CONFIG_ST_THERMAL)	+= st/
 obj-$(CONFIG_TEGRA_SOCTHERM)	+= tegra_soctherm.o
 obj-$(CONFIG_HISI_THERMAL)     += hisi_thermal.o
+obj-$(CONFIG_SUNXI_THS)		+= sunxi_ths.o
diff --git a/drivers/thermal/sunxi_ths.c b/drivers/thermal/sunxi_ths.c
new file mode 100644
index 0000000..650cd39
--- /dev/null
+++ b/drivers/thermal/sunxi_ths.c
@@ -0,0 +1,263 @@
+/*
+ * Sunxi THS driver
+ *
+ * Copyright (C) 2015 Josef Gajdusek
+ *
+ * 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-provider.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/printk.h>
+#include <linux/reset.h>
+#include <linux/thermal.h>
+
+#define THS_H3_CTRL0			0x00
+#define THS_H3_CTRL1			0x04
+#define THS_H3_CDAT				0x14
+#define THS_H3_CTRL2			0x40
+#define THS_H3_INT_CTRL			0x44
+#define THS_H3_STAT				0x48
+#define THS_H3_ALARM_CTRL		0x50
+#define THS_H3_SHUTDOWN_CTRL	0x60
+#define THS_H3_FILTER			0x70
+#define THS_H3_CDATA			0x74
+#define THS_H3_DATA				0x80
+
+#define THS_H3_CTRL0_SENSOR_ACQ0		0
+
+#define THS_H3_CTRL1_ADC_CALI_EN		17
+#define THS_H3_CTRL1_OP_BIAS			20
+
+#define THS_H3_CTRL2_SENSE_EN			0
+#define THS_H3_CTRL2_SENSOR_ACQ1		16
+
+#define THS_H3_INT_CTRL_ALARM_INT_EN	0
+#define THS_H3_INT_CTRL_SHUT_INT_EN		4
+#define THS_H3_INT_CTRL_DATA_IRQ_EN		8
+#define THS_H3_INT_CTRL_THERMAL_PER		12
+
+#define THS_H3_STAT_ALARM_INT_STS		0
+#define THS_H3_STAT_SHUT_INT_STS		4
+#define THS_H3_STAT_DATA_IRQ_STS		8
+#define THS_H3_STAT_ALARM_OFF_STS		12
+
+#define THS_H3_ALARM_CTRL_ALARM0_T_HYST		0
+#define THS_H3_ALARM_CTRL_ALARM0_T_HOT		16
+
+#define THS_H3_SHUTDOWN_CTRL_SHUT0_T_HOT	16
+
+#define THS_H3_FILTER_TYPE				0
+#define THS_H3_FILTER_EN				2
+
+struct sunxi_ths_data {
+	struct sunxi_ths_type *type;
+	struct reset_control *reset;
+	struct clk *clk;
+	struct clk *busclk;
+	void __iomem *regs;
+	void __iomem *calreg;
+	struct platform_device *pdev;
+	struct thermal_zone_device *tzd;
+	int irq;
+};
+
+struct sunxi_ths_type {
+	int (*init)(struct sunxi_ths_data *);
+	int (*get_temp)(struct sunxi_ths_data *, int *out);
+};
+
+static int sunxi_ths_reg_to_temperature(int32_t reg, int divisor, int minus)
+{
+	return minus - (reg * 1000000) / divisor;
+}
+
+static int sunxi_ths_get_temp(void *_data, int *out)
+{
+	struct sunxi_ths_data *data = _data;
+
+	return data->type->get_temp(data, out);
+}
+
+static int sunxi_ths_h3_init(struct sunxi_ths_data *data)
+{
+	if (data->calreg)
+		writel(readl(data->calreg) & 0xfff, data->regs + THS_H3_CDATA);
+	/* Magical constants mostly taken from Allwinner 3.4 kernel.
+	 * Seem to work fine, though this could be configurable in DT/sysft
+	 */
+	writel(0xff << THS_H3_CTRL0_SENSOR_ACQ0,
+			data->regs + THS_H3_CTRL0);
+	writel((0x3f << THS_H3_CTRL2_SENSOR_ACQ1) | BIT(THS_H3_CTRL2_SENSE_EN),
+			data->regs + THS_H3_CTRL2);
+	writel((0x390 << THS_H3_INT_CTRL_THERMAL_PER) | BIT(THS_H3_INT_CTRL_DATA_IRQ_EN),
+			data->regs + THS_H3_INT_CTRL);
+	writel(BIT(THS_H3_FILTER_EN) | (0x2 << THS_H3_FILTER_TYPE),
+			data->regs + THS_H3_FILTER);
+	return 0;
+}
+
+static int sunxi_ths_h3_get_temp(struct sunxi_ths_data *data, int *out)
+{
+	*out = sunxi_ths_reg_to_temperature(readl(data->regs + THS_H3_DATA),
+			8253, 217000);
+	return 0;
+}
+
+static const struct thermal_zone_of_device_ops sunxi_ths_thermal_ops = {
+	.get_temp = sunxi_ths_get_temp,
+};
+
+static const struct sunxi_ths_type sunxi_ths_device_h3 = {
+	.init = sunxi_ths_h3_init,
+	.get_temp = sunxi_ths_h3_get_temp,
+};
+
+static const struct of_device_id sunxi_ths_id_table[] = {
+	{
+		.compatible = "allwinner,sun8i-h3-ths",
+		.data = &sunxi_ths_device_h3,
+	},
+	{
+		/* sentinel */
+	},
+};
+MODULE_DEVICE_TABLE(of, sunxi_ths_id_table);
+
+static int sunxi_ths_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	const struct of_device_id *match;
+	struct sunxi_ths_data *data;
+	struct resource *res;
+	int ret;
+
+	match = of_match_node(sunxi_ths_id_table, np);
+	if (!match)
+		return -ENXIO;
+
+	data =
+		devm_kzalloc(&pdev->dev, sizeof(struct sunxi_ths_data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->type = (struct sunxi_ths_type *) match->data;
+	data->pdev = pdev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	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);
+	data->calreg = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(data->calreg))
+		data->calreg = NULL; /* No calibration register */
+
+	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_optional(&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 = reset_control_deassert(data->reset);
+	if (ret) {
+		dev_err(&pdev->dev, "reset deassert failed: %d\n", ret);
+		goto err_disable_ths;
+	}
+
+	ret = data->type->init(data);
+	if (ret)
+		goto err_reset_assert;
+
+	data->tzd = thermal_zone_of_sensor_register(&pdev->dev, 0, data,
+									&sunxi_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_reset_assert;
+	}
+
+	platform_set_drvdata(pdev, data);
+	return 0;
+
+err_reset_assert:
+	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 sunxi_ths_remove(struct platform_device *pdev)
+{
+	struct sunxi_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 struct platform_driver sunxi_ths_driver = {
+	.probe = sunxi_ths_probe,
+	.remove = sunxi_ths_remove,
+	.driver = {
+		.name = "sunxi_ths",
+		.of_match_table = sunxi_ths_id_table,
+	},
+};
+
+module_platform_driver(sunxi_ths_driver);
+
+MODULE_AUTHOR("Josef Gajdusek <atx@....name>");
+MODULE_DESCRIPTION("Sunxi THS driver");
+MODULE_LICENSE("GPL v2");
-- 
2.4.10

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