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From 9f251fdbaaf3bd895c2901413748679d68a0c644 Mon Sep 17 00:00:00 2001
From: popcornmix <popcornmix@gmail.com>
Date: Tue, 26 Mar 2013 19:24:24 +0000
Subject: [PATCH 044/232] Added hwmon/thermal driver for reporting core
temperature. Thanks Dorian
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
BCM270x: Move thermal sensor to Device Tree
Add Device Tree support to bcm2835-thermal driver.
Add thermal sensor device to Device Tree.
Don't add platform device when booting in DT mode.
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
---
drivers/thermal/Kconfig | 7 ++
drivers/thermal/Makefile | 1 +
drivers/thermal/bcm2835-thermal.c | 141 ++++++++++++++++++++++++++++++++++++++
3 files changed, 149 insertions(+)
create mode 100644 drivers/thermal/bcm2835-thermal.c
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -285,6 +285,13 @@ config INTEL_POWERCLAMP
enforce idle time which results in more package C-state residency. The
user interface is exposed via generic thermal framework.
+config THERMAL_BCM2835
+ depends on RASPBERRYPI_FIRMWARE
+ tristate "BCM2835 Thermal Driver"
+ help
+ This will enable temperature monitoring for the Broadcom BCM2835
+ chip. If built as a module, it will be called 'bcm2835-thermal'.
+
config X86_PKG_TEMP_THERMAL
tristate "X86 package temperature thermal driver"
depends on X86_THERMAL_VECTOR
--- a/drivers/thermal/Makefile
+++ b/drivers/thermal/Makefile
@@ -38,6 +38,7 @@ obj-$(CONFIG_ARMADA_THERMAL) += armada_t
obj-$(CONFIG_IMX_THERMAL) += imx_thermal.o
obj-$(CONFIG_DB8500_CPUFREQ_COOLING) += db8500_cpufreq_cooling.o
obj-$(CONFIG_INTEL_POWERCLAMP) += intel_powerclamp.o
+obj-$(CONFIG_THERMAL_BCM2835) += bcm2835-thermal.o
obj-$(CONFIG_X86_PKG_TEMP_THERMAL) += x86_pkg_temp_thermal.o
obj-$(CONFIG_INTEL_SOC_DTS_IOSF_CORE) += intel_soc_dts_iosf.o
obj-$(CONFIG_INTEL_SOC_DTS_THERMAL) += intel_soc_dts_thermal.o
--- /dev/null
+++ b/drivers/thermal/bcm2835-thermal.c
@@ -0,0 +1,141 @@
+/*****************************************************************************
+* Copyright 2011 Broadcom Corporation. All rights reserved.
+*
+* Unless you and Broadcom execute a separate written software license
+* agreement governing use of this software, this software is licensed to you
+* under the terms of the GNU General Public License version 2, available at
+* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
+*
+* Notwithstanding the above, under no circumstances may you combine this
+* software in any way with any other Broadcom software provided under a
+* license other than the GPL, without Broadcom's express prior written
+* consent.
+*****************************************************************************/
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/thermal.h>
+#include <soc/bcm2835/raspberrypi-firmware.h>
+
+static int bcm2835_thermal_get_property(struct thermal_zone_device *tz,
+ int *temp, u32 tag)
+{
+ struct rpi_firmware *fw = tz->devdata;
+ struct {
+ u32 id;
+ u32 val;
+ } packet;
+ int ret;
+
+ *temp = 0;
+ packet.id = 0;
+ ret = rpi_firmware_property(fw, tag, &packet, sizeof(packet));
+ if (ret) {
+ dev_err(&tz->device, "Failed to get temperature\n");
+ return ret;
+ }
+
+ *temp = packet.val;
+ dev_dbg(&tz->device, "%stemp=%d\n",
+ tag == RPI_FIRMWARE_GET_MAX_TEMPERATURE ? "max" : "", *temp);
+
+ return 0;
+}
+
+static int bcm2835_thermal_get_temp(struct thermal_zone_device *tz,
+ int *temp)
+{
+ return bcm2835_thermal_get_property(tz, temp,
+ RPI_FIRMWARE_GET_TEMPERATURE);
+}
+
+static int bcm2835_thermal_get_max_temp(struct thermal_zone_device *tz,
+ int trip, int *temp)
+{
+ /*
+ * The maximum safe temperature of the SoC.
+ * Overclock may be disabled above this temperature.
+ */
+ return bcm2835_thermal_get_property(tz, temp,
+ RPI_FIRMWARE_GET_MAX_TEMPERATURE);
+}
+
+static int bcm2835_thermal_get_trip_type(struct thermal_zone_device *tz,
+ int trip, enum thermal_trip_type *type)
+{
+ *type = THERMAL_TRIP_HOT;
+
+ return 0;
+}
+
+static int bcm2835_thermal_get_mode(struct thermal_zone_device *tz,
+ enum thermal_device_mode *mode)
+{
+ *mode = THERMAL_DEVICE_ENABLED;
+
+ return 0;
+}
+
+static struct thermal_zone_device_ops ops = {
+ .get_temp = bcm2835_thermal_get_temp,
+ .get_trip_temp = bcm2835_thermal_get_max_temp,
+ .get_trip_type = bcm2835_thermal_get_trip_type,
+ .get_mode = bcm2835_thermal_get_mode,
+};
+
+static int bcm2835_thermal_probe(struct platform_device *pdev)
+{
+ struct device_node *fw_np;
+ struct rpi_firmware *fw;
+ struct thermal_zone_device *tz;
+
+ fw_np = of_parse_phandle(pdev->dev.of_node, "firmware", 0);
+/* Remove comment when booting without Device Tree is no longer supported
+ if (!fw_np) {
+ dev_err(&pdev->dev, "Missing firmware node\n");
+ return -ENOENT;
+ }
+*/
+ fw = rpi_firmware_get(fw_np);
+ if (!fw)
+ return -EPROBE_DEFER;
+
+ tz = thermal_zone_device_register("bcm2835_thermal", 1, 0, fw, &ops,
+ NULL, 0, 0);
+ if (IS_ERR(tz)) {
+ dev_err(&pdev->dev, "Failed to register the thermal device\n");
+ return PTR_ERR(tz);
+ }
+
+ platform_set_drvdata(pdev, tz);
+
+ return 0;
+}
+
+static int bcm2835_thermal_remove(struct platform_device *pdev)
+{
+ thermal_zone_device_unregister(platform_get_drvdata(pdev));
+
+ return 0;
+}
+
+static const struct of_device_id bcm2835_thermal_of_match_table[] = {
+ { .compatible = "brcm,bcm2835-thermal", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, bcm2835_thermal_of_match_table);
+
+static struct platform_driver bcm2835_thermal_driver = {
+ .probe = bcm2835_thermal_probe,
+ .remove = bcm2835_thermal_remove,
+ .driver = {
+ .name = "bcm2835_thermal",
+ .of_match_table = bcm2835_thermal_of_match_table,
+ },
+};
+module_platform_driver(bcm2835_thermal_driver);
+
+MODULE_AUTHOR("Dorian Peake");
+MODULE_AUTHOR("Noralf Trønnes");
+MODULE_DESCRIPTION("Thermal driver for bcm2835 chip");
+MODULE_LICENSE("GPL");
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