kernel: backport Broadcom thermal drivers

This includes driver for Northstar and for Raspberry Pi.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

1 files changed, 173 insertions, 0 deletions

diff --git a/target/linux/generic/patches-4.9/081-0002-thermal-broadcom-add-Northstar-thermal-driver.patch b/target/linux/generic/patches-4.9/081-0002-thermal-broadcom-add-Northstar-thermal-driver.patch
new file mode 100644
index 0000000..8ba8cb5
--- /dev/null
+++ b/target/linux/generic/patches-4.9/081-0002-thermal-broadcom-add-Northstar-thermal-driver.patch
@@ -0,0 +1,173 @@
+From a94cb7eeecc4104a6874339f90c5d0647359c102 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Mon, 3 Apr 2017 17:48:29 +0200
+Subject: [PATCH] thermal: broadcom: add Northstar thermal driver
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+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: Rafał Miłecki <rafal@milecki.pl>
+Signed-off-by: Jon Mason <jon.mason@broadcom.com>
+Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
+---
+ drivers/thermal/Kconfig               |   5 ++
+ drivers/thermal/Makefile              |   1 +
+ drivers/thermal/broadcom/Kconfig      |   8 +++
+ drivers/thermal/broadcom/Makefile     |   1 +
+ drivers/thermal/broadcom/ns-thermal.c | 105 ++++++++++++++++++++++++++++++++++
+ 5 files changed, 120 insertions(+)
+ create mode 100644 drivers/thermal/broadcom/Kconfig
+ create mode 100644 drivers/thermal/broadcom/Makefile
+ create mode 100644 drivers/thermal/broadcom/ns-thermal.c
+
+--- a/drivers/thermal/Kconfig
++++ b/drivers/thermal/Kconfig
+@@ -381,6 +381,11 @@ 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
+--- a/drivers/thermal/Makefile
++++ b/drivers/thermal/Makefile
+@@ -26,6 +26,7 @@ thermal_sys-$(CONFIG_CLOCK_THERMAL)	+= c
+ thermal_sys-$(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-$(CONFIG_ROCKCHIP_THERMAL)	+= rockchip_thermal.o
+--- /dev/null
++++ b/drivers/thermal/broadcom/Kconfig
+@@ -0,0 +1,8 @@
++config BCM_NS_THERMAL
++	tristate "Northstar thermal driver"
++	depends on ARCH_BCM_IPROC || COMPILE_TEST
++	help
++	  Northstar is a family of SoCs that includes e.g. BCM4708, BCM47081,
++	  BCM4709 and BCM47094. It contains DMU (Device Management Unit) block
++	  with a thermal sensor that allows checking CPU temperature. This
++	  driver provides support for it.
+--- /dev/null
++++ b/drivers/thermal/broadcom/Makefile
+@@ -0,0 +1 @@
++obj-$(CONFIG_BCM_NS_THERMAL)		+= ns-thermal.o
+--- /dev/null
++++ b/drivers/thermal/broadcom/ns-thermal.c
+@@ -0,0 +1,105 @@
++/*
++ * 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");