[PATCH 7/7] thermal: qoriq: Add thermal management support

[Jia Hongtao]

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@xxxxxxx>
---
 drivers/thermal/Kconfig         |   9 ++
 drivers/thermal/Makefile        |   1 +
 drivers/thermal/qoriq_thermal.c | 328 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 338 insertions(+)
 create mode 100644 drivers/thermal/qoriq_thermal.c

diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index 2d702ca..bef26cd 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -195,6 +195,15 @@ config IMX_THERMAL
 	  cpufreq is used as the cooling device to throttle CPUs when the
 	  passive trip is crossed.
 
+config QORIQ_THERMAL
+	tristate "QorIQ Thermal Monitoring Unit"
+	depends on THERMAL_OF
+	help
+	  Support for Thermal Monitoring Unit (TMU) found on QorIQ platforms.
+	  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
 	tristate "SPEAr thermal sensor driver"
 	depends on PLAT_SPEAR || COMPILE_TEST
diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
index 10b07c1..6662232 100644
--- a/drivers/thermal/Makefile
+++ b/drivers/thermal/Makefile
@@ -37,6 +37,7 @@ obj-$(CONFIG_DB8500_THERMAL)	+= db8500_thermal.o
 obj-$(CONFIG_ARMADA_THERMAL)	+= armada_thermal.o
 obj-$(CONFIG_TANGO_THERMAL)	+= tango_thermal.o
 obj-$(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..644ba52
--- /dev/null
+++ b/drivers/thermal/qoriq_thermal.c
@@ -0,0 +1,328 @@
+/*
+ * Copyright 2016 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 {
+	u32 tritsr;		/* Immediate Temperature Site Register */
+	u32 tratsr;		/* Average Temperature Site Register */
+	u8 res0[0x8];
+};
+
+struct qoriq_tmu_regs {
+	u32 tmr;		/* Mode Register */
+#define TMR_DISABLE	0x0
+#define TMR_ME		0x80000000
+#define TMR_ALPF	0x0c000000
+	u32 tsr;		/* Status Register */
+	u32 tmtmir;		/* Temperature measurement interval Register */
+#define TMTMIR_DEFAULT	0x0000000f
+	u8 res0[0x14];
+	u32 tier;		/* Interrupt Enable Register */
+#define TIER_DISABLE	0x0
+	u32 tidr;		/* Interrupt Detect Register */
+	u32 tiscr;		/* Interrupt Site Capture Register */
+	u32 ticscr;		/* Interrupt Critical Site Capture Register */
+	u8 res1[0x10];
+	u32 tmhtcrh;		/* High Temperature Capture Register */
+	u32 tmhtcrl;		/* Low Temperature Capture Register */
+	u8 res2[0x8];
+	u32 tmhtitr;		/* High Temperature Immediate Threshold */
+	u32 tmhtatr;		/* High Temperature Average Threshold */
+	u32 tmhtactr;	/* High Temperature Average Crit Threshold */
+	u8 res3[0x24];
+	u32 ttcfgr;		/* Temperature Configuration Register */
+	u32 tscfgr;		/* Sensor Configuration Register */
+	u8 res4[0x78];
+	struct qoriq_tmu_site_regs site[SITES_MAX];
+	u8 res5[0x9f8];
+	u32 ipbrr0;		/* IP Block Revision Register 0 */
+	u32 ipbrr1;		/* IP Block Revision Register 1 */
+	u8 res6[0x310];
+	u32 ttr0cr;		/* Temperature Range 0 Control Register */
+	u32 ttr1cr;		/* Temperature Range 1 Control Register */
+	u32 ttr2cr;		/* Temperature Range 2 Control Register */
+	u32 ttr3cr;		/* Temperature Range 3 Control Register */
+};
+
+/*
+ * Thermal zone data
+ */
+struct qoriq_tmu_data {
+	struct thermal_zone_device *tz;
+	struct qoriq_tmu_regs __iomem *regs;
+	int sensor_id;
+	bool little_endian;
+};
+
+static void tmu_write(struct qoriq_tmu_data *p, u32 val, void __iomem *addr)
+{
+	if (p->little_endian)
+		iowrite32(val, addr);
+	else
+		iowrite32be(val, addr);
+}
+
+static u32 tmu_read(struct qoriq_tmu_data *p, void __iomem *addr)
+{
+	if (p->little_endian)
+		return ioread32(addr);
+	else
+		return ioread32be(addr);
+}
+
+static int tmu_get_temp(void *p, int *temp)
+{
+	u32 val;
+	struct qoriq_tmu_data *data = p;
+
+	val = tmu_read(data, &data->regs->site[data->sensor_id].tritsr);
+	*temp = (val & 0xff) * 1000;
+
+	return 0;
+}
+
+static int qoriq_tmu_get_sensor_id(void)
+{
+	int ret, id;
+	struct of_phandle_args sensor_specs;
+	struct device_node *np, *sensor_np;
+
+	np = of_find_node_by_name(NULL, "thermal-zones");
+	if (!np)
+		return -ENODEV;
+
+	sensor_np = of_get_next_child(np, NULL);
+	ret = of_parse_phandle_with_args(sensor_np, "thermal-sensors",
+			"#thermal-sensor-cells",
+			0, &sensor_specs);
+	if (ret) {
+		of_node_put(np);
+		of_node_put(sensor_np);
+		return ret;
+	}
+
+	if (sensor_specs.args_count >= 1) {
+		id = sensor_specs.args[0];
+		WARN(sensor_specs.args_count > 1,
+				"%s: too many cells in sensor specifier %d\n",
+				sensor_specs.np->name, sensor_specs.args_count);
+	} else {
+		id = 0;
+	}
+
+	of_node_put(np);
+	of_node_put(sensor_np);
+
+	return id;
+}
+
+static int qoriq_tmu_calibration(struct platform_device *pdev)
+{
+	int i, val, len;
+	u32 range[4];
+	const u32 *calibration;
+	struct device_node *np = pdev->dev.of_node;
+	struct qoriq_tmu_data *data = platform_get_drvdata(pdev);
+
+	if (of_property_read_u32_array(np, "fsl,tmu-range", range, 4)) {
+		dev_err(&pdev->dev, "missing calibration range.\n");
+		return -ENODEV;
+	}
+
+	/* Init temperature range registers */
+	tmu_write(data, range[0], &data->regs->ttr0cr);
+	tmu_write(data, range[1], &data->regs->ttr1cr);
+	tmu_write(data, range[2], &data->regs->ttr2cr);
+	tmu_write(data, range[3], &data->regs->ttr3cr);
+
+	calibration = of_get_property(np, "fsl,tmu-calibration", &len);
+	if (calibration == NULL || len % 8) {
+		dev_err(&pdev->dev, "invalid calibration data.\n");
+		return -ENODEV;
+	}
+
+	for (i = 0; i < len; i += 8, calibration += 2) {
+		val = of_read_number(calibration, 1);
+		tmu_write(data, val, &data->regs->ttcfgr);
+		val = of_read_number(calibration + 1, 1);
+		tmu_write(data, val, &data->regs->tscfgr);
+	}
+
+	return 0;
+}
+
+static void qoriq_tmu_init_device(struct qoriq_tmu_data *data)
+{
+	/* Disable interrupt, using polling instead */
+	tmu_write(data, TIER_DISABLE, &data->regs->tier);
+
+	/* Set update_interval */
+	tmu_write(data, TMTMIR_DEFAULT, &data->regs->tmtmir);
+
+	/* Disable monitoring */
+	tmu_write(data, TMR_DISABLE, &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;
+	struct device_node *np = pdev->dev.of_node;
+	u32 site = 0;
+
+	if (!np) {
+		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->little_endian = of_property_read_bool(np, "little-endian");
+
+	data->sensor_id = qoriq_tmu_get_sensor_id();
+	if (data->sensor_id < 0) {
+		dev_err(&pdev->dev, "Failed to get sensor id\n");
+		ret = -ENODEV;
+		goto err_iomap;
+	}
+
+	data->regs = of_iomap(np, 0);
+	if (!data->regs) {
+		dev_err(&pdev->dev, "Failed to get memory region\n");
+		ret = -ENODEV;
+		goto err_iomap;
+	}
+
+	qoriq_tmu_init_device(data);	/* TMU initialization */
+
+	ret = qoriq_tmu_calibration(pdev);	/* TMU calibration */
+	if (ret < 0)
+		goto err_tmu;
+
+	data->tz = thermal_zone_of_sensor_register(&pdev->dev, data->sensor_id,
+				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);
+
+	/* Enable monitoring */
+	site |= 0x1 << (15 - data->sensor_id);
+	tmu_write(data, site | TMR_ME | TMR_ALPF, &data->regs->tmr);
+
+	return 0;
+
+err_tmu:
+	iounmap(data->regs);
+
+err_iomap:
+	platform_set_drvdata(pdev, NULL);
+
+	return ret;
+}
+
+static int qoriq_tmu_remove(struct platform_device *pdev)
+{
+	struct qoriq_tmu_data *data = platform_get_drvdata(pdev);
+
+	thermal_zone_of_sensor_unregister(&pdev->dev, data->tz);
+
+	/* Disable monitoring */
+	tmu_write(data, TMR_DISABLE, &data->regs->tmr);
+
+	iounmap(data->regs);
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int qoriq_tmu_suspend(struct device *dev)
+{
+	u32 tmr;
+	struct qoriq_tmu_data *data = dev_get_drvdata(dev);
+
+	/* Disable monitoring */
+	tmr = tmu_read(data, &data->regs->tmr);
+	tmr &= ~TMR_ME;
+	tmu_write(data, tmr, &data->regs->tmr);
+
+	return 0;
+}
+
+static int qoriq_tmu_resume(struct device *dev)
+{
+	u32 tmr;
+	struct qoriq_tmu_data *data = dev_get_drvdata(dev);
+
+	/* Enable monitoring */
+	tmr = tmu_read(data, &data->regs->tmr);
+	tmr |= TMR_ME;
+	tmu_write(data, tmr, &data->regs->tmr);
+
+	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", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, qoriq_tmu_match);
+
+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@xxxxxxx>");
+MODULE_DESCRIPTION("QorIQ Thermal Monitoring Unit driver");
+MODULE_LICENSE("GPL v2");
-- 
2.1.0.27.g96db324