--- /dev/null
+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
+@@ -365,6 +365,11 @@ config INTEL_PCH_THERMAL
+ Thermal reporting device will provide temperature reading,
+ programmable trip points and other information.
+
++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
+ source "drivers/thermal/ti-soc-thermal/Kconfig"
+--- 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");
projects / openwrt / openwrt.git / blobdiff