thermal: Introduce Amazon's Annapurna Labs Thermal Driver (71aa3693) · Commits · 戴 / test

MAINTAINERS

+6 −0

Original line number	Diff line number	Diff line
		@@ -744,6 +744,12 @@ S: Supported
		F: Documentation/networking/device_drivers/amazon/ena.txt
		F: drivers/net/ethernet/amazon/

		AMAZON ANNAPURNA LABS THERMAL MMIO DRIVER
		M: Talel Shenhar <talel@amazon.com>
		S: Maintained
		F: Documentation/devicetree/bindings/thermal/amazon,al-thermal.txt
		F: drivers/thermal/thermal_mmio.c

		AMD CRYPTOGRAPHIC COPROCESSOR (CCP) DRIVER
		M: Tom Lendacky <thomas.lendacky@amd.com>
		M: Gary Hook <gary.hook@amd.com>

drivers/thermal/Kconfig

+10 −0

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		@@ -200,6 +200,16 @@ config THERMAL_EMULATION
		because userland can easily disable the thermal policy by simply
		flooding this sysfs node with low temperature values.

		config THERMAL_MMIO
		tristate "Generic Thermal MMIO driver"
		depends on OF \|\| COMPILE_TEST
		help
		This option enables the generic thermal MMIO driver that will use
		memory-mapped reads to get the temperature. Any HW/System that
		allows temperature reading by a single memory-mapped reading, be it
		register or shared memory, is a potential candidate to work with this
		driver.

		config HISI_THERMAL
		tristate "Hisilicon thermal driver"
		depends on ARCH_HISI \|\| COMPILE_TEST

drivers/thermal/Makefile

+1 −0

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		@@ -29,6 +29,7 @@ thermal_sys-$(CONFIG_DEVFREQ_THERMAL) += devfreq_cooling.o

		# platform thermal drivers
		obj-y += broadcom/
		obj-$(CONFIG_THERMAL_MMIO) += thermal_mmio.o
		obj-$(CONFIG_SPEAR_THERMAL) += spear_thermal.o
		obj-$(CONFIG_ROCKCHIP_THERMAL) += rockchip_thermal.o
		obj-$(CONFIG_RCAR_THERMAL) += rcar_thermal.o

drivers/thermal/thermal_mmio.c

0 → 100644

+129 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		/*
		* Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
		*/

		#include <linux/module.h>
		#include <linux/of_address.h>
		#include <linux/platform_device.h>
		#include <linux/thermal.h>

		struct thermal_mmio {
		void __iomem *mmio_base;
		u32 (read_mmio)(void __iomem mmio_base);
		u32 mask;
		int factor;
		};

		static u32 thermal_mmio_readb(void __iomem *mmio_base)
		{
		return readb(mmio_base);
		}

		static int thermal_mmio_get_temperature(void private, int temp)
		{
		int t;
		struct thermal_mmio *sensor =
		(struct thermal_mmio *)private;

		t = sensor->read_mmio(sensor->mmio_base) & sensor->mask;
		t *= sensor->factor;

		*temp = t;

		return 0;
		}

		static struct thermal_zone_of_device_ops thermal_mmio_ops = {
		.get_temp = thermal_mmio_get_temperature,
		};

		static int thermal_mmio_probe(struct platform_device *pdev)
		{
		struct resource *resource;
		struct thermal_mmio *sensor;
		int (sensor_init_func)(struct platform_device pdev,
		struct thermal_mmio *sensor);
		struct thermal_zone_device *thermal_zone;
		int ret;
		int temperature;

		sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
		if (!sensor)
		return -ENOMEM;

		resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		if (IS_ERR(resource)) {
		dev_err(&pdev->dev,
		"fail to get platform memory resource (%ld)\n",
		PTR_ERR(resource));
		return PTR_ERR(resource);
		}

		sensor->mmio_base = devm_ioremap_resource(&pdev->dev, resource);
		if (IS_ERR(sensor->mmio_base)) {
		dev_err(&pdev->dev, "failed to ioremap memory (%ld)\n",
		PTR_ERR(sensor->mmio_base));
		return PTR_ERR(sensor->mmio_base);
		}

		sensor_init_func = device_get_match_data(&pdev->dev);
		if (sensor_init_func) {
		ret = sensor_init_func(pdev, sensor);
		if (ret) {
		dev_err(&pdev->dev,
		"failed to initialize sensor (%d)\n",
		ret);
		return ret;
		}
		}

		thermal_zone = devm_thermal_zone_of_sensor_register(&pdev->dev,
		0,
		sensor,
		&thermal_mmio_ops);
		if (IS_ERR(thermal_zone)) {
		dev_err(&pdev->dev,
		"failed to register sensor (%ld)\n",
		PTR_ERR(thermal_zone));
		return PTR_ERR(thermal_zone);
		}

		thermal_mmio_get_temperature(sensor, &temperature);
		dev_info(&pdev->dev,
		"thermal mmio sensor %s registered, current temperature: %d\n",
		pdev->name, temperature);

		return 0;
		}

		static int al_thermal_init(struct platform_device *pdev,
		struct thermal_mmio *sensor)
		{
		sensor->read_mmio = thermal_mmio_readb;
		sensor->mask = 0xff;
		sensor->factor = 1000;

		return 0;
		}

		static const struct of_device_id thermal_mmio_id_table[] = {
		{ .compatible = "amazon,al-thermal", .data = al_thermal_init},
		{}
		};
		MODULE_DEVICE_TABLE(of, thermal_mmio_id_table);

		static struct platform_driver thermal_mmio_driver = {
		.probe = thermal_mmio_probe,
		.driver = {
		.name = "thermal-mmio",
		.owner = THIS_MODULE,
		.of_match_table = of_match_ptr(thermal_mmio_id_table),
		},
		};

		module_platform_driver(thermal_mmio_driver);

		MODULE_AUTHOR("Talel Shenhar <talel@amazon.com>");
		MODULE_DESCRIPTION("Thermal MMIO Driver");
		MODULE_LICENSE("GPL v2");

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