RE: [PATCH V2 7/7] thermal: qoriq: Add thermal management support

From: Hongtao Jia
Date: Fri Aug 05 2016 - 04:04:11 EST

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Hi Eduardo,

If you have any comments please let me know.

Thanks.
-Hongtao.

> -----Original Message-----
> From: Linuxppc-dev [mailto:linuxppc-dev-
> bounces+b38951=freescale.com@xxxxxxxxxxxxxxxx] On Behalf Of Hongtao Jia
> Sent: Tuesday, July 19, 2016 2:54 PM
> To: edubezval@xxxxxxxxx; rui.zhang@xxxxxxxxx; Scott Wood
> <scott.wood@xxxxxxx>
> Cc: devicetree@xxxxxxxxxxxxxxx; linuxppc-dev@xxxxxxxxxxxxxxxx; linux-
> kernel@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linux-
> pm@xxxxxxxxxxxxxxx
> Subject: RE: [PATCH V2 7/7] thermal: qoriq: Add thermal management support
>
> Hi Eduardo,
>
> Any comments on this patch?
>
> Thanks.
> -Hongtao.
>
> > -----Original Message-----
> > From: Jia Hongtao [mailto:hongtao.jia@xxxxxxx]
> > Sent: Thursday, June 30, 2016 11:09 AM
> > To: edubezval@xxxxxxxxx; rui.zhang@xxxxxxxxx; robh+dt@xxxxxxxxxx;
> > galak@xxxxxxxxxxxxxx; Scott Wood <scott.wood@xxxxxxx>;
> > shawnguo@xxxxxxxxxx
> > Cc: linux-pm@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; linux-
> > kernel@xxxxxxxxxxxxxxx; linuxppc-dev@xxxxxxxxxxxxxxxx; linux-arm-
> > kernel@xxxxxxxxxxxxxxxxxxx; Hongtao Jia <hongtao.jia@xxxxxxx>
> > Subject: [PATCH V2 7/7] thermal: qoriq: Add thermal management support
> >
> > 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>
> > ---
> > Changes of V2:
> > * Add HAS_IOMEM dependency to fix build error on UM
> >
> > drivers/thermal/Kconfig | 10 ++
> > drivers/thermal/Makefile | 1 +
> > drivers/thermal/qoriq_thermal.c | 328
> > ++++++++++++++++++++++++++++++++++++++++
> > 3 files changed, 339 insertions(+)
> > create mode 100644 drivers/thermal/qoriq_thermal.c
> >
> > diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index
> > 2d702ca..56ef30d 100644
> > --- a/drivers/thermal/Kconfig
> > +++ b/drivers/thermal/Kconfig
> > @@ -195,6 +195,16 @@ 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
> > + depends on HAS_IOMEM
> > + 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
>
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