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Commit a94cb7ee authored by Rafał Miłecki's avatar Rafał Miłecki Committed by Eduardo Valentin
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thermal: broadcom: add Northstar thermal driver 



Northstar is a SoC family commonly used in home routers. This commit
adds a driver for checking CPU temperature. As Northstar Plus seems to
also have this IP block this new symbol gets ARCH_BCM_IPROC dependency.

Signed-off-by: default avatarRafał Miłecki <rafal@milecki.pl>
Signed-off-by: default avatarJon Mason <jon.mason@broadcom.com>
Signed-off-by: default avatarEduardo Valentin <edubezval@gmail.com>
parent ee7cdbec

drivers/thermal/Kconfig

+5 −0
Original line number Diff line number Diff line
@@ -392,6 +392,11 @@ config MTK_THERMAL 
	  Enable this option if you want to have support for thermal management

	  controller present in Mediatek SoCs



menu "Broadcom thermal drivers"

depends on ARCH_BCM || COMPILE_TEST

source "drivers/thermal/broadcom/Kconfig"

endmenu



menu "Texas Instruments thermal drivers"

depends on ARCH_HAS_BANDGAP || COMPILE_TEST

depends on HAS_IOMEM

drivers/thermal/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ thermal_sys-$(CONFIG_CLOCK_THERMAL) += clock_cooling.o 
thermal_sys-$(CONFIG_DEVFREQ_THERMAL) += devfreq_cooling.o



# platform thermal drivers

obj-y				+= broadcom/

obj-$(CONFIG_QCOM_SPMI_TEMP_ALARM)	+= qcom-spmi-temp-alarm.o

obj-$(CONFIG_SPEAR_THERMAL)	+= spear_thermal.o

obj-$(CONFIG_ROCKCHIP_THERMAL)	+= rockchip_thermal.o

drivers/thermal/broadcom/Kconfig

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+8 −0
Original line number Diff line number Diff line 
config BCM_NS_THERMAL

	tristate "Northstar thermal driver"

	depends on ARCH_BCM_IPROC || COMPILE_TEST

	help

	  Northstar is a family of SoCs that includes e.g. BCM4708, BCM47081,

	  BCM4709 and BCM47094. It contains DMU (Device Management Unit) block

	  with a thermal sensor that allows checking CPU temperature. This

	  driver provides support for it.

drivers/thermal/broadcom/Makefile

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+1 −0
Original line number Diff line number Diff line 
obj-$(CONFIG_BCM_NS_THERMAL)		+= ns-thermal.o

drivers/thermal/broadcom/ns-thermal.c

0 → 100644
+105 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2017 Rafał Miłecki <rafal@milecki.pl>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */



#include <linux/module.h>

#include <linux/of_address.h>

#include <linux/platform_device.h>

#include <linux/thermal.h>



#define PVTMON_CONTROL0					0x00

#define PVTMON_CONTROL0_SEL_MASK			0x0000000e

#define PVTMON_CONTROL0_SEL_TEMP_MONITOR		0x00000000

#define PVTMON_CONTROL0_SEL_TEST_MODE			0x0000000e

#define PVTMON_STATUS					0x08



struct ns_thermal {

	struct thermal_zone_device *tz;

	void __iomem *pvtmon;

};



static int ns_thermal_get_temp(void *data, int *temp)

{

	struct ns_thermal *ns_thermal = data;

	int offset = thermal_zone_get_offset(ns_thermal->tz);

	int slope = thermal_zone_get_slope(ns_thermal->tz);

	u32 val;



	val = readl(ns_thermal->pvtmon + PVTMON_CONTROL0);

	if ((val & PVTMON_CONTROL0_SEL_MASK) != PVTMON_CONTROL0_SEL_TEMP_MONITOR) {

		/* Clear current mode selection */

		val &= ~PVTMON_CONTROL0_SEL_MASK;



		/* Set temp monitor mode (it's the default actually) */

		val |= PVTMON_CONTROL0_SEL_TEMP_MONITOR;



		writel(val, ns_thermal->pvtmon + PVTMON_CONTROL0);

	}



	val = readl(ns_thermal->pvtmon + PVTMON_STATUS);

	*temp = slope * val + offset;



	return 0;

}



static const struct thermal_zone_of_device_ops ns_thermal_ops = {

	.get_temp = ns_thermal_get_temp,

};



static int ns_thermal_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct ns_thermal *ns_thermal;



	ns_thermal = devm_kzalloc(dev, sizeof(*ns_thermal), GFP_KERNEL);

	if (!ns_thermal)

		return -ENOMEM;



	ns_thermal->pvtmon = of_iomap(dev_of_node(dev), 0);

	if (WARN_ON(!ns_thermal->pvtmon))

		return -ENOENT;



	ns_thermal->tz = devm_thermal_zone_of_sensor_register(dev, 0,

							      ns_thermal,

							      &ns_thermal_ops);

	if (IS_ERR(ns_thermal->tz)) {

		iounmap(ns_thermal->pvtmon);

		return PTR_ERR(ns_thermal->tz);

	}



	platform_set_drvdata(pdev, ns_thermal);



	return 0;

}



static int ns_thermal_remove(struct platform_device *pdev)

{

	struct ns_thermal *ns_thermal = platform_get_drvdata(pdev);



	iounmap(ns_thermal->pvtmon);



	return 0;

}



static const struct of_device_id ns_thermal_of_match[] = {

	{ .compatible = "brcm,ns-thermal", },

	{},

};

MODULE_DEVICE_TABLE(of, ns_thermal_of_match);



static struct platform_driver ns_thermal_driver = {

	.probe		= ns_thermal_probe,

	.remove		= ns_thermal_remove,

	.driver = {

		.name = "ns-thermal",

		.of_match_table = ns_thermal_of_match,

	},

};

module_platform_driver(ns_thermal_driver);



MODULE_DESCRIPTION("Northstar thermal driver");

MODULE_LICENSE("GPL v2");