[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
More information about the Linuxppc-dev
mailing list