[PATCH 2/2] thermal: broadcom: add Northstar thermal driver

["Rafał Miłecki" <zajec5-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

From: Rafał Miłecki <rafal-g1n6cQUeyibVItvQsEIGlw@public.gmane.org>

Northstar is a SoC family commonly used in home routers. This commit
adds a driver for checking CPU temperature.

Signed-off-by: Rafał Miłecki <rafal-g1n6cQUeyibVItvQsEIGlw@public.gmane.org>
---
 drivers/thermal/Kconfig               |  5 ++
 drivers/thermal/Makefile              |  1 +
 drivers/thermal/broadcom/Kconfig      |  7 +++
 drivers/thermal/broadcom/Makefile     |  1 +
 drivers/thermal/broadcom/ns-thermal.c | 93 +++++++++++++++++++++++++++++++++++
 5 files changed, 107 insertions(+)
 create mode 100644 drivers/thermal/broadcom/Kconfig
 create mode 100644 drivers/thermal/broadcom/Makefile
 create mode 100644 drivers/thermal/broadcom/ns-thermal.c

diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index 776b34396144..008e173ec825 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -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
diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
index 7adae2029355..549d81b6363c 100644
--- a/drivers/thermal/Makefile
+++ b/drivers/thermal/Makefile
@@ -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-$(CONFIG_ROCKCHIP_THERMAL)	+= rockchip_thermal.o
diff --git a/drivers/thermal/broadcom/Kconfig b/drivers/thermal/broadcom/Kconfig
new file mode 100644
index 000000000000..08457a461794
--- /dev/null
+++ b/drivers/thermal/broadcom/Kconfig
@@ -0,0 +1,7 @@
+config BCM_NS_THERMAL
+	tristate "Northstar thermal driver"
+	depends on ARCH_BCM_5301X || COMPILE_TEST
+	help
+	  Northstar's DMU (Device Management Unit) block contains a thermal
+	  sensor that allows checking CPU temperature. This driver provides
+	  support for it.
diff --git a/drivers/thermal/broadcom/Makefile b/drivers/thermal/broadcom/Makefile
new file mode 100644
index 000000000000..059df9a0ed69
--- /dev/null
+++ b/drivers/thermal/broadcom/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_BCM_NS_THERMAL)		+= ns-thermal.o
diff --git a/drivers/thermal/broadcom/ns-thermal.c b/drivers/thermal/broadcom/ns-thermal.c
new file mode 100644
index 000000000000..1ec710febc55
--- /dev/null
+++ b/drivers/thermal/broadcom/ns-thermal.c
@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2017 Rafał Miłecki <rafal-g1n6cQUeyibVItvQsEIGlw@public.gmane.org>
+ *
+ * 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_STATUS		0x08
+
+struct ns_thermal {
+	void __iomem *pvtmon;
+};
+
+static int ns_thermal_get_temp(void *data, int *temp)
+{
+	struct ns_thermal *ns_thermal = data;
+	u32 val;
+
+	val = readl(ns_thermal->pvtmon + PVTMON_STATUS);
+	*temp = 418000 - (val * 556);
+
+	return 0;
+}
+
+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;
+	struct thermal_zone_device *tzd;
+	u32 val;
+
+	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;
+
+	val = readl(ns_thermal->pvtmon + PVTMON_CONTROL0);
+	if (val & 0xf)
+		writel(val & ~0xf, ns_thermal->pvtmon + PVTMON_CONTROL0);
+
+	tzd = devm_thermal_zone_of_sensor_register(dev, 0, ns_thermal,
+						   &ns_thermal_ops);
+	if (IS_ERR(tzd)) {
+		iounmap(ns_thermal->pvtmon);
+		return PTR_ERR(tzd);
+	}
+
+	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");
-- 
2.11.0

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