174 lines
5.3 KiB
Diff
174 lines
5.3 KiB
Diff
From a94cb7eeecc4104a6874339f90c5d0647359c102 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
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Date: Mon, 3 Apr 2017 17:48:29 +0200
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Subject: [PATCH] thermal: broadcom: add Northstar thermal driver
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Northstar is a SoC family commonly used in home routers. This commit
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adds a driver for checking CPU temperature. As Northstar Plus seems to
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also have this IP block this new symbol gets ARCH_BCM_IPROC dependency.
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Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
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Signed-off-by: Jon Mason <jon.mason@broadcom.com>
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Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
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---
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drivers/thermal/Kconfig | 5 ++
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drivers/thermal/Makefile | 1 +
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drivers/thermal/broadcom/Kconfig | 8 +++
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drivers/thermal/broadcom/Makefile | 1 +
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drivers/thermal/broadcom/ns-thermal.c | 105 ++++++++++++++++++++++++++++++++++
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5 files changed, 120 insertions(+)
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create mode 100644 drivers/thermal/broadcom/Kconfig
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create mode 100644 drivers/thermal/broadcom/Makefile
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create mode 100644 drivers/thermal/broadcom/ns-thermal.c
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--- a/drivers/thermal/Kconfig
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+++ b/drivers/thermal/Kconfig
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@@ -381,6 +381,11 @@ config MTK_THERMAL
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Enable this option if you want to have support for thermal management
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controller present in Mediatek SoCs
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+menu "Broadcom thermal drivers"
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+depends on ARCH_BCM || COMPILE_TEST
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+source "drivers/thermal/broadcom/Kconfig"
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+endmenu
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+
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menu "Texas Instruments thermal drivers"
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depends on ARCH_HAS_BANDGAP || COMPILE_TEST
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depends on HAS_IOMEM
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--- a/drivers/thermal/Makefile
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+++ b/drivers/thermal/Makefile
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@@ -26,6 +26,7 @@ thermal_sys-$(CONFIG_CLOCK_THERMAL) += c
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thermal_sys-$(CONFIG_DEVFREQ_THERMAL) += devfreq_cooling.o
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# platform thermal drivers
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+obj-y += broadcom/
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obj-$(CONFIG_QCOM_SPMI_TEMP_ALARM) += qcom-spmi-temp-alarm.o
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obj-$(CONFIG_SPEAR_THERMAL) += spear_thermal.o
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obj-$(CONFIG_ROCKCHIP_THERMAL) += rockchip_thermal.o
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--- /dev/null
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+++ b/drivers/thermal/broadcom/Kconfig
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@@ -0,0 +1,8 @@
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+config BCM_NS_THERMAL
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+ tristate "Northstar thermal driver"
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+ depends on ARCH_BCM_IPROC || COMPILE_TEST
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+ help
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+ Northstar is a family of SoCs that includes e.g. BCM4708, BCM47081,
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+ BCM4709 and BCM47094. It contains DMU (Device Management Unit) block
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+ with a thermal sensor that allows checking CPU temperature. This
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+ driver provides support for it.
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--- /dev/null
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+++ b/drivers/thermal/broadcom/Makefile
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@@ -0,0 +1 @@
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+obj-$(CONFIG_BCM_NS_THERMAL) += ns-thermal.o
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--- /dev/null
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+++ b/drivers/thermal/broadcom/ns-thermal.c
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@@ -0,0 +1,105 @@
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+/*
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+ * Copyright (C) 2017 Rafał Miłecki <rafal@milecki.pl>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/of_address.h>
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+#include <linux/platform_device.h>
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+#include <linux/thermal.h>
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+
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+#define PVTMON_CONTROL0 0x00
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+#define PVTMON_CONTROL0_SEL_MASK 0x0000000e
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+#define PVTMON_CONTROL0_SEL_TEMP_MONITOR 0x00000000
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+#define PVTMON_CONTROL0_SEL_TEST_MODE 0x0000000e
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+#define PVTMON_STATUS 0x08
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+
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+struct ns_thermal {
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+ struct thermal_zone_device *tz;
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+ void __iomem *pvtmon;
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+};
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+
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+static int ns_thermal_get_temp(void *data, int *temp)
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+{
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+ struct ns_thermal *ns_thermal = data;
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+ int offset = thermal_zone_get_offset(ns_thermal->tz);
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+ int slope = thermal_zone_get_slope(ns_thermal->tz);
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+ u32 val;
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+
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+ val = readl(ns_thermal->pvtmon + PVTMON_CONTROL0);
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+ if ((val & PVTMON_CONTROL0_SEL_MASK) != PVTMON_CONTROL0_SEL_TEMP_MONITOR) {
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+ /* Clear current mode selection */
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+ val &= ~PVTMON_CONTROL0_SEL_MASK;
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+
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+ /* Set temp monitor mode (it's the default actually) */
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+ val |= PVTMON_CONTROL0_SEL_TEMP_MONITOR;
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+
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+ writel(val, ns_thermal->pvtmon + PVTMON_CONTROL0);
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+ }
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+
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+ val = readl(ns_thermal->pvtmon + PVTMON_STATUS);
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+ *temp = slope * val + offset;
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+
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+ return 0;
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+}
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+
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+static const struct thermal_zone_of_device_ops ns_thermal_ops = {
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+ .get_temp = ns_thermal_get_temp,
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+};
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+
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+static int ns_thermal_probe(struct platform_device *pdev)
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+{
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+ struct device *dev = &pdev->dev;
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+ struct ns_thermal *ns_thermal;
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+
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+ ns_thermal = devm_kzalloc(dev, sizeof(*ns_thermal), GFP_KERNEL);
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+ if (!ns_thermal)
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+ return -ENOMEM;
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+
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+ ns_thermal->pvtmon = of_iomap(dev_of_node(dev), 0);
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+ if (WARN_ON(!ns_thermal->pvtmon))
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+ return -ENOENT;
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+
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+ ns_thermal->tz = devm_thermal_zone_of_sensor_register(dev, 0,
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+ ns_thermal,
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+ &ns_thermal_ops);
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+ if (IS_ERR(ns_thermal->tz)) {
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+ iounmap(ns_thermal->pvtmon);
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+ return PTR_ERR(ns_thermal->tz);
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+ }
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+
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+ platform_set_drvdata(pdev, ns_thermal);
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+
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+ return 0;
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+}
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+
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+static int ns_thermal_remove(struct platform_device *pdev)
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+{
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+ struct ns_thermal *ns_thermal = platform_get_drvdata(pdev);
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+
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+ iounmap(ns_thermal->pvtmon);
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+
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+ return 0;
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+}
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+
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+static const struct of_device_id ns_thermal_of_match[] = {
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+ { .compatible = "brcm,ns-thermal", },
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+ {},
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+};
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+MODULE_DEVICE_TABLE(of, ns_thermal_of_match);
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+
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+static struct platform_driver ns_thermal_driver = {
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+ .probe = ns_thermal_probe,
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+ .remove = ns_thermal_remove,
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+ .driver = {
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+ .name = "ns-thermal",
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+ .of_match_table = ns_thermal_of_match,
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+ },
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+};
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+module_platform_driver(ns_thermal_driver);
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+
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+MODULE_DESCRIPTION("Northstar thermal driver");
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+MODULE_LICENSE("GPL v2");
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