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Message-Id: <1527486084-4636-4-git-send-email-srinath.mannam@broadcom.com>
Date: Mon, 28 May 2018 11:11:24 +0530
From: Srinath Mannam <srinath.mannam@...adcom.com>
To: Zhang Rui <rui.zhang@...el.com>,
Eduardo Valentin <edubezval@...il.com>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
bcm-kernel-feedback-list@...adcom.com,
Pramod Kumar <pramod.kumar@...adcom.com>,
Srinath Mannam <srinath.mannam@...adcom.com>
Subject: [PATCH 3/3] thermal: broadcom: Add Stingray thermal driver
From: Pramod Kumar <pramod.kumar@...adcom.com>
This commit adds stingray thermal driver to monitor six
thermal zones temperature and trips at critical temperature.
Signed-off-by: Pramod Kumar <pramod.kumar@...adcom.com>
Signed-off-by: Srinath Mannam <srinath.mannam@...adcom.com>
Reviewed-by: Ray Jui <ray.jui@...adcom.com>
Reviewed-by: Scott Branden <scott.branden@...adcom.com>
Reviewed-by: Vikram Prakash <vikram.prakash@...adcom.com>
---
drivers/thermal/Kconfig | 3 +-
drivers/thermal/broadcom/Kconfig | 9 ++
drivers/thermal/broadcom/Makefile | 1 +
drivers/thermal/broadcom/sr-thermal.c | 151 ++++++++++++++++++++++++++++++++++
4 files changed, 163 insertions(+), 1 deletion(-)
create mode 100644 drivers/thermal/broadcom/sr-thermal.c
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index 8297988..26d39d4 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -416,7 +416,8 @@ config MTK_THERMAL
controller present in Mediatek SoCs
menu "Broadcom thermal drivers"
-depends on ARCH_BCM || ARCH_BRCMSTB || ARCH_BCM2835 || COMPILE_TEST
+depends on ARCH_BCM || ARCH_BRCMSTB || ARCH_BCM2835 || ARCH_BCM_IPROC || \
+ COMPILE_TEST
source "drivers/thermal/broadcom/Kconfig"
endmenu
diff --git a/drivers/thermal/broadcom/Kconfig b/drivers/thermal/broadcom/Kconfig
index c106a15..dc9a9bd 100644
--- a/drivers/thermal/broadcom/Kconfig
+++ b/drivers/thermal/broadcom/Kconfig
@@ -22,3 +22,12 @@ config BCM_NS_THERMAL
BCM4708, BCM4709, BCM5301x, BCM95852X, etc). It contains DMU (Device
Management Unit) block with a thermal sensor that allows checking CPU
temperature.
+
+config BCM_SR_THERMAL
+ tristate "Stingray thermal driver"
+ depends on ARCH_BCM_IPROC || COMPILE_TEST
+ default ARCH_BCM_IPROC
+ help
+ Support for the Stingray family of SoCs. Its different blocks like
+ iHost, CRMU and NITRO has thermal sensor that allows checking its
+ temperature.
diff --git a/drivers/thermal/broadcom/Makefile b/drivers/thermal/broadcom/Makefile
index fae10ec..79df69e 100644
--- a/drivers/thermal/broadcom/Makefile
+++ b/drivers/thermal/broadcom/Makefile
@@ -1,3 +1,4 @@
obj-$(CONFIG_BCM2835_THERMAL) += bcm2835_thermal.o
obj-$(CONFIG_BRCMSTB_THERMAL) += brcmstb_thermal.o
obj-$(CONFIG_BCM_NS_THERMAL) += ns-thermal.o
+obj-$(CONFIG_BCM_SR_THERMAL) += sr-thermal.o
diff --git a/drivers/thermal/broadcom/sr-thermal.c b/drivers/thermal/broadcom/sr-thermal.c
new file mode 100644
index 0000000..5baaa6e
--- /dev/null
+++ b/drivers/thermal/broadcom/sr-thermal.c
@@ -0,0 +1,151 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 Broadcom
+ */
+
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/thermal.h>
+
+#define TMON_CRIT_TEMP 105000 /* temp in millidegree C */
+
+struct sr_thermal {
+ struct thermal_zone_device *tz;
+ struct device *dev;
+ void __iomem *regs;
+ unsigned int crit_temp;
+};
+
+static int sr_get_temp(struct thermal_zone_device *tz, int *temp)
+{
+ struct sr_thermal *sr_thermal = tz->devdata;
+
+ *temp = readl(sr_thermal->regs);
+
+ return 0;
+}
+
+static int sr_get_trip_type(struct thermal_zone_device *tz, int trip,
+ enum thermal_trip_type *type)
+{
+ struct sr_thermal *sr_thermal = tz->devdata;
+
+ switch (trip) {
+ case 0:
+ *type = THERMAL_TRIP_CRITICAL;
+ break;
+ default:
+ dev_dbg(sr_thermal->dev,
+ "Driver does not support more than 1 trip point\n");
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int sr_get_trip_temp(struct thermal_zone_device *tz, int trip, int *temp)
+{
+ struct sr_thermal *sr_thermal = tz->devdata;
+
+ switch (trip) {
+ case 0:
+ *temp = sr_thermal->crit_temp;
+ break;
+ default:
+ dev_dbg(sr_thermal->dev,
+ "Driver does not support more than 1 trip point\n");
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int sr_set_trip_temp(struct thermal_zone_device *tz, int trip, int temp)
+{
+ struct sr_thermal *sr_thermal = tz->devdata;
+
+ switch (trip) {
+ case 0:
+ /*
+ * Allow the user to change critical temperature
+ * as per their requirement, could be for debug
+ * purpose, even if it's more than the recommended
+ * critical temperature.
+ */
+ sr_thermal->crit_temp = temp;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static struct thermal_zone_device_ops sr_thermal_ops = {
+ .get_temp = sr_get_temp,
+ .get_trip_type = sr_get_trip_type,
+ .get_trip_temp = sr_get_trip_temp,
+ .set_trip_temp = sr_set_trip_temp,
+};
+
+static int sr_thermal_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct sr_thermal *sr_thermal;
+ struct resource *res;
+
+ sr_thermal = devm_kzalloc(dev, sizeof(*sr_thermal), GFP_KERNEL);
+ if (!sr_thermal)
+ return -ENOMEM;
+ sr_thermal->dev = dev;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ sr_thermal->regs = devm_memremap(&pdev->dev, res->start,
+ resource_size(res), MEMREMAP_WB);
+ if (IS_ERR(sr_thermal->regs)) {
+ dev_err(dev, "failed to get io address\n");
+ return PTR_ERR(sr_thermal->regs);
+ }
+
+ /* initialize tmon value to 0 */
+ writel(0, sr_thermal->regs);
+ sr_thermal->crit_temp = TMON_CRIT_TEMP;
+
+ sr_thermal->tz = thermal_zone_device_register(dev_name(dev), 1, 1,
+ sr_thermal,
+ &sr_thermal_ops,
+ NULL, 1000, 1000);
+ if (IS_ERR(sr_thermal->tz))
+ return PTR_ERR(sr_thermal->tz);
+
+ platform_set_drvdata(pdev, sr_thermal);
+
+ return 0;
+}
+
+static int sr_thermal_remove(struct platform_device *pdev)
+{
+ struct sr_thermal *sr_thermal = platform_get_drvdata(pdev);
+
+ thermal_zone_device_unregister(sr_thermal->tz);
+
+ return 0;
+}
+
+static const struct of_device_id sr_thermal_of_match[] = {
+ { .compatible = "brcm,sr-thermal", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, sr_thermal_of_match);
+
+static struct platform_driver sr_thermal_driver = {
+ .probe = sr_thermal_probe,
+ .remove = sr_thermal_remove,
+ .driver = {
+ .name = "sr-thermal",
+ .of_match_table = sr_thermal_of_match,
+ },
+};
+module_platform_driver(sr_thermal_driver);
+
+MODULE_AUTHOR("Pramod Kumar <pramod.kumar@...adcom.com>");
+MODULE_DESCRIPTION("Stingray thermal driver");
+MODULE_LICENSE("GPL v2");
--
2.7.4
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