[PATCH V3 2/2] thermal: broadcom: add Northstar thermal driver
Rafał Miłecki
zajec5 at gmail.com
Fri Mar 31 00:32:12 PDT 2017
From: Rafał Miłecki <rafal at milecki.pl>
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 at milecki.pl>
Signed-off-by: Jon Mason <jon.mason at broadcom.com>
---
V2: Make it iProc specific as NSP can also use this driver
Select proper symbols in config ARCH_BCM_IPROC
Define PVTMON register bits
Update code selecting temperature monitor mode
Thank you Jon!
V3: More details in help message for BCM_NS_THERMAL
Use slope & offset
Drop arch code change (I'll be submitted using a proper tree)
Thank you Eduardo!
---
drivers/thermal/Kconfig | 5 ++
drivers/thermal/Makefile | 1 +
drivers/thermal/broadcom/Kconfig | 8 +++
drivers/thermal/broadcom/Makefile | 1 +
drivers/thermal/broadcom/ns-thermal.c | 101 ++++++++++++++++++++++++++++++++++
5 files changed, 116 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-$(CONFIG_ROCKCHIP_THERMAL) += rockchip_thermal.o
diff --git a/drivers/thermal/broadcom/Kconfig b/drivers/thermal/broadcom/Kconfig
new file mode 100644
index 000000000000..f0dea8a8e002
--- /dev/null
+++ b/drivers/thermal/broadcom/Kconfig
@@ -0,0 +1,8 @@
+config BCM_NS_THERMAL
+ tristate "Northstar thermal driver"
+ depends on ARCH_BCM_IPROC || COMPILE_TEST
+ help
+ Northstar is a family of SoCs that includes e.g. BCM4708, BCM47081,
+ BCM4709 and BCM47094. It contains DMU (Device Management Unit) block
+ with a thermal sensor that allows checking CPU temperature. This
+ driver provides support for it.
diff --git a/drivers/thermal/broadcom/Makefile b/drivers/thermal/broadcom/Makefile
new file mode 100644
index 000000000000..059df9a0ed69
--- /dev/null
+++ b/drivers/thermal/broadcom/Makefile
@@ -0,0 +1 @@
+obj-$(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..245fe8c6012b
--- /dev/null
+++ b/drivers/thermal/broadcom/ns-thermal.c
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2017 Rafał Miłecki <rafal at 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) {
+ val &= ~PVTMON_CONTROL0_SEL_MASK;
+ 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;
+}
+
+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");
--
2.11.0
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