[PATCH V4 2/5] thermal: qoriq: Add thermal management support

Jia Hongtao hongtao.jia at freescale.com
Tue Nov 24 17:52:45 AEDT 2015


This driver add thermal management support by enabling TMU (Thermal
Monitoring Unit) on QorIQ platform.

It's based on thermal of framework:
- Trip points defined in device tree.
- Cpufreq as cooling device registered in qoriq cpufreq driver.

Signed-off-by: Jia Hongtao <hongtao.jia at freescale.com>
Reviewed-by: Scott Wood <scottwood at freescale.com>
---
V4 changes:
- Code cleanup:
    * Remove unnecessary comments.
    * Remove unnecessary cpufreq.h inclusion.
    * Remove unnecessary ENABLE mode setting in probe function.
    * Redefine tmu_get_temp function.

V3 changes:
- Using thermal of framework.

 drivers/thermal/Kconfig         |  10 ++
 drivers/thermal/Makefile        |   1 +
 drivers/thermal/qoriq_thermal.c | 262 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 273 insertions(+)
 create mode 100644 drivers/thermal/qoriq_thermal.c

diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index c463c89..43a925c 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -194,6 +194,16 @@ config IMX_THERMAL
 	  cpufreq is used as the cooling device to throttle CPUs when the
 	  passive trip is crossed.
 
+config QORIQ_THERMAL
+	tristate "Freescale QorIQ Thermal Monitoring Unit"
+	depends on CPU_THERMAL
+	depends on THERMAL_OF
+	help
+	  Enable thermal management based on Freescale QorIQ Thermal Monitoring
+	  Unit (TMU). It supports one critical trip point and one passive trip
+	  point. The cpufreq is used as the cooling device to throttle CPUs when
+	  the passive trip is crossed.
+
 config SPEAR_THERMAL
 	bool "SPEAr thermal sensor driver"
 	depends on PLAT_SPEAR || COMPILE_TEST
diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
index cfae6a6..e269979 100644
--- a/drivers/thermal/Makefile
+++ b/drivers/thermal/Makefile
@@ -36,6 +36,7 @@ obj-$(CONFIG_DOVE_THERMAL)  	+= dove_thermal.o
 obj-$(CONFIG_DB8500_THERMAL)	+= db8500_thermal.o
 obj-$(CONFIG_ARMADA_THERMAL)	+= armada_thermal.o
 obj-$(CONFIG_IMX_THERMAL)	+= imx_thermal.o
+obj-$(CONFIG_QORIQ_THERMAL)	+= qoriq_thermal.o
 obj-$(CONFIG_DB8500_CPUFREQ_COOLING)	+= db8500_cpufreq_cooling.o
 obj-$(CONFIG_INTEL_POWERCLAMP)	+= intel_powerclamp.o
 obj-$(CONFIG_X86_PKG_TEMP_THERMAL)	+= x86_pkg_temp_thermal.o
diff --git a/drivers/thermal/qoriq_thermal.c b/drivers/thermal/qoriq_thermal.c
new file mode 100644
index 0000000..2a563f9
--- /dev/null
+++ b/drivers/thermal/qoriq_thermal.c
@@ -0,0 +1,262 @@
+/*
+ * Copyright 2015 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/thermal.h>
+
+#include "thermal_core.h"
+
+#define SITES_MAX	16
+
+/*
+ * QorIQ TMU Registers
+ */
+struct qoriq_tmu_site_regs {
+	__be32 tritsr;		/* Immediate Temperature Site Register */
+	__be32 tratsr;		/* Average Temperature Site Register */
+	u8 res0[0x8];
+} __packed;
+
+struct qoriq_tmu_regs {
+	__be32 tmr;		/* Mode Register */
+#define TMR_DISABLE	0x0
+#define TMR_ME		0x80000000
+#define TMR_ALPF	0x0c000000
+#define TMR_MSITE	0x00008000	/* Core temperature site */
+#define TMR_ALL		(TMR_ME | TMR_ALPF | TMR_MSITE)
+	__be32 tsr;		/* Status Register */
+	__be32 tmtmir;		/* Temperature measurement interval Register */
+#define TMTMIR_DEFAULT	0x0000000f
+	u8 res0[0x14];
+	__be32 tier;		/* Interrupt Enable Register */
+#define TIER_DISABLE	0x0
+	__be32 tidr;		/* Interrupt Detect Register */
+	__be32 tiscr;		/* Interrupt Site Capture Register */
+	__be32 ticscr;		/* Interrupt Critical Site Capture Register */
+	u8 res1[0x10];
+	__be32 tmhtcrh;		/* High Temperature Capture Register */
+	__be32 tmhtcrl;		/* Low Temperature Capture Register */
+	u8 res2[0x8];
+	__be32 tmhtitr;		/* High Temperature Immediate Threshold */
+	__be32 tmhtatr;		/* High Temperature Average Threshold */
+	__be32 tmhtactr;	/* High Temperature Average Crit Threshold */
+	u8 res3[0x24];
+	__be32 ttcfgr;		/* Temperature Configuration Register */
+	__be32 tscfgr;		/* Sensor Configuration Register */
+	u8 res4[0x78];
+	struct qoriq_tmu_site_regs site[SITES_MAX];
+	u8 res5[0x9f8];
+	__be32 ipbrr0;		/* IP Block Revision Register 0 */
+	__be32 ipbrr1;		/* IP Block Revision Register 1 */
+	u8 res6[0x310];
+	__be32 ttr0cr;		/* Temperature Range 0 Control Register */
+	__be32 ttr1cr;		/* Temperature Range 1 Control Register */
+	__be32 ttr2cr;		/* Temperature Range 2 Control Register */
+	__be32 ttr3cr;		/* Temperature Range 3 Control Register */
+};
+
+/*
+ * Thermal zone data
+ */
+struct qoriq_tmu_data {
+	struct thermal_zone_device *tz;
+	struct qoriq_tmu_regs __iomem *regs;
+};
+
+static int tmu_get_temp(void *p, int *temp)
+{
+	u32 val;
+	struct qoriq_tmu_data *data = p;
+
+	val = ioread32be(&data->regs->site[0].tritsr);
+	*temp = (val & 0xff) * 1000;
+
+	return 0;
+}
+
+static int qoriq_tmu_calibration(struct platform_device *pdev)
+{
+	int i, val, len;
+	u32 range[4];
+	const __be32 *calibration;
+	struct device_node *node = pdev->dev.of_node;
+	struct qoriq_tmu_data *data = platform_get_drvdata(pdev);
+
+	/* Disable monitoring before calibration */
+	iowrite32be(TMR_DISABLE, &data->regs->tmr);
+
+	if (of_property_read_u32_array(node, "fsl,tmu-range", range, 4)) {
+		dev_err(&pdev->dev, "TMU: missing calibration range.\n");
+		return -ENODEV;
+	}
+
+	/* Init temperature range registers */
+	iowrite32be(range[0], &data->regs->ttr0cr);
+	iowrite32be(range[1], &data->regs->ttr1cr);
+	iowrite32be(range[2], &data->regs->ttr2cr);
+	iowrite32be(range[3], &data->regs->ttr3cr);
+
+	calibration = of_get_property(node, "fsl,tmu-calibration", &len);
+	if (calibration == NULL) {
+		dev_err(&pdev->dev, "TMU: missing calibration data.\n");
+		return -ENODEV;
+	}
+
+	for (i = 0; i < len; i += 8, calibration += 2) {
+		val = of_read_number(calibration, 1);
+		iowrite32be(val, &data->regs->ttcfgr);
+		val = of_read_number(calibration + 1, 1);
+		iowrite32be(val, &data->regs->tscfgr);
+	}
+
+	return 0;
+}
+
+static void qoriq_tmu_init_device(struct qoriq_tmu_data *data)
+{
+	/* Disable interrupt, using polling instead */
+	iowrite32be(TIER_DISABLE, &data->regs->tier);
+
+	/* Set update_interval */
+	iowrite32be(TMTMIR_DEFAULT, &data->regs->tmtmir);
+
+	/* Enable monitoring */
+	iowrite32be(TMR_ALL, &data->regs->tmr);
+}
+
+static struct thermal_zone_of_device_ops tmu_tz_ops = {
+	.get_temp = tmu_get_temp,
+};
+
+static int qoriq_tmu_probe(struct platform_device *pdev)
+{
+	int ret;
+	const struct thermal_trip *trip;
+	struct qoriq_tmu_data *data;
+
+	if (!pdev->dev.of_node) {
+		dev_err(&pdev->dev, "Device OF-Node is NULL");
+		return -ENODEV;
+	}
+
+	data = devm_kzalloc(&pdev->dev, sizeof(struct qoriq_tmu_data),
+			    GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, data);
+	data->regs = of_iomap(pdev->dev.of_node, 0);
+
+	if (!data->regs) {
+		dev_err(&pdev->dev, "Failed to get memory region\n");
+		ret = -ENODEV;
+		goto err_iomap;
+	}
+
+	ret = qoriq_tmu_calibration(pdev);	/* TMU calibration */
+	if (ret < 0)
+		goto err_tmu;
+
+	qoriq_tmu_init_device(data);	/* TMU initialization */
+
+	data->tz = thermal_zone_of_sensor_register(&pdev->dev, 0,
+				data, &tmu_tz_ops);
+	if (IS_ERR(data->tz)) {
+		ret = PTR_ERR(data->tz);
+		dev_err(&pdev->dev,
+			"Failed to register thermal zone device %d\n", ret);
+		goto err_tmu;
+	}
+
+	trip = of_thermal_get_trip_points(data->tz);
+
+	return 0;
+
+err_tmu:
+	iounmap(data->regs);
+
+err_iomap:
+	platform_set_drvdata(pdev, NULL);
+	devm_kfree(&pdev->dev, data);
+
+	return ret;
+}
+
+static int qoriq_tmu_remove(struct platform_device *pdev)
+{
+	struct qoriq_tmu_data *data = platform_get_drvdata(pdev);
+
+	/* Disable monitoring */
+	iowrite32be(TMR_DISABLE, &data->regs->tmr);
+
+	thermal_zone_of_sensor_unregister(&pdev->dev, data->tz);
+	iounmap(data->regs);
+
+	platform_set_drvdata(pdev, NULL);
+	devm_kfree(&pdev->dev, data);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int qoriq_tmu_suspend(struct device *dev)
+{
+	struct qoriq_tmu_data *data = dev_get_drvdata(dev);
+
+	/* Disable monitoring */
+	iowrite32be(TMR_DISABLE, &data->regs->tmr);
+	data->tz->ops->set_mode(data->tz, THERMAL_DEVICE_DISABLED);
+
+	return 0;
+}
+
+static int qoriq_tmu_resume(struct device *dev)
+{
+	struct qoriq_tmu_data *data = dev_get_drvdata(dev);
+
+	/* Enable monitoring */
+	iowrite32be(TMR_ALL, &data->regs->tmr);
+	data->tz->ops->set_mode(data->tz, THERMAL_DEVICE_ENABLED);
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(qoriq_tmu_pm_ops,
+			 qoriq_tmu_suspend, qoriq_tmu_resume);
+
+static const struct of_device_id qoriq_tmu_match[] = {
+	{ .compatible = "fsl,qoriq-tmu", },
+	{},
+};
+
+static struct platform_driver qoriq_tmu = {
+	.driver	= {
+		.name		= "qoriq_thermal",
+		.pm		= &qoriq_tmu_pm_ops,
+		.of_match_table	= qoriq_tmu_match,
+	},
+	.probe	= qoriq_tmu_probe,
+	.remove	= qoriq_tmu_remove,
+};
+module_platform_driver(qoriq_tmu);
+
+MODULE_AUTHOR("Jia Hongtao <hongtao.jia at freescale.com>");
+MODULE_DESCRIPTION("Freescale QorIQ Thermal Monitoring Unit driver");
+MODULE_LICENSE("GPL v2");
-- 
2.1.0.27.g96db324



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