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Commit 71aa3693 authored by Talel Shenhar's avatar Talel Shenhar Committed by Eduardo Valentin
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thermal: Introduce Amazon's Annapurna Labs Thermal Driver 



This is a generic thermal driver for simple MMIO sensors, of which
amazon,al-thermal is one.

This device uses a single MMIO transaction to read the temperature and
report it to the thermal subsystem.

Signed-off-by: default avatarTalel Shenhar <talel@amazon.com>
Reviewed-by: default avatarDavid Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: default avatarEduardo Valentin <edubezval@gmail.com>
parent c8044b91

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
Original line number Diff line number Diff line
@@ -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
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// 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");