On Fri, 25 Oct 2013 17:00:27 -0700, "Wendy Ng" <[email protected]> wrote: > This adds the support for Temperature Monitor (TMON) driver for > Broadcom bcm281xx SoCs. This driver plugs into the Thermal Framework. > > Note that this version of the TMON driver does support interrupt-driven > mode -- only polling-mode of the thermal framework can be used. > > Signed-off-by: Wendy Ng <[email protected]> > Reviewed-by: Markus Mayer <[email protected]> > Reviewed-by: Christian Daudt <[email protected]> > Reviewed-by: Matt Porter <[email protected]> > Reviewed-by: Tim Kryger <[email protected]> > --- > .../bindings/thermal/bcm-kona-thermal.txt | 24 +++ > drivers/thermal/Kconfig | 11 ++ > drivers/thermal/Makefile | 1 + > drivers/thermal/bcm_kona_tmon.c | 173 > ++++++++++++++++++++ > 4 files changed, 209 insertions(+) > create mode 100644 > Documentation/devicetree/bindings/thermal/bcm-kona-thermal.txt > create mode 100644 drivers/thermal/bcm_kona_tmon.c > > diff --git a/Documentation/devicetree/bindings/thermal/bcm-kona-thermal.txt > b/Documentation/devicetree/bindings/thermal/bcm-kona-thermal.txt > new file mode 100644 > index 0000000..225b898 > --- /dev/null > +++ b/Documentation/devicetree/bindings/thermal/bcm-kona-thermal.txt > @@ -0,0 +1,24 @@ > +* Broadcom Kona TMON bindings > + > +This version is for the Kona family of SoCs. The TMON (Temperature Monitor) > +block in a Kona SoC device is used to measure the chip temperature at > constant > +intervals. > +The TMON block asserts an interrupt if temperature exceeds a user programmed > +threshold value. The TMON block would reset the entire device once it > +reaches a critical temperature which is also a programmable setting. > + > +Required properties: > +- compatible : "brcm,bcm11351-tmon", "brcm,kona-tmon" > +- reg : Address range of the thermal register > +- clocks : the clock signal that drives the TMON block > +- interrupts: the interrupt signal associated with the TMON block > + > + > +Example: > + tmon@34008000 { > + compatible = "brcm,bcm11351-tmon", "brcm,kona-tmon"; > + reg = <0x34008000 0x0024>; > + clocks = <&tmon_1m_clk>; > + interrupts = <GIC_SPI 183 IRQ_TYPE_LEVEL_HIGH>; > + status = "disabled";
I would drop the status="disabled" from the example, but otherwise the binding looks fine. g. > + }; > diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig > index 9e7cc3f..02200ad 100644 > --- a/drivers/thermal/Kconfig > +++ b/drivers/thermal/Kconfig > @@ -166,6 +166,17 @@ config DB8500_THERMAL > created. Cooling devices can be bound to the trip points to cool this > thermal zone if trip points reached. > > +config BCM_KONA_TMON_THERMAL > + tristate "Temperature Monitor driver on Broadcom Kona family of SoCs" > + depends on ARCH_BCM_MOBILE > + depends on THERMAL_OF > + default y > + help > + If you say yes here you get support for the TMON > + (Temperature Monitor) in Broadcom Kona family of SoCs. > + This also provides the generic support of the Thermal Framework > + for Broadcom Kona family of SoCs. > + > config ARMADA_THERMAL > tristate "Armada 370/XP thermal management" > depends on ARCH_MVEBU > diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile > index 4b03956..5e85354 100644 > --- a/drivers/thermal/Makefile > +++ b/drivers/thermal/Makefile > @@ -22,6 +22,7 @@ obj-$(CONFIG_SPEAR_THERMAL) += spear_thermal.o > obj-$(CONFIG_RCAR_THERMAL) += rcar_thermal.o > obj-$(CONFIG_KIRKWOOD_THERMAL) += kirkwood_thermal.o > obj-y += samsung/ > +obj-$(CONFIG_BCM_KONA_TMON_THERMAL) += bcm_kona_tmon.o > obj-$(CONFIG_DOVE_THERMAL) += dove_thermal.o > obj-$(CONFIG_DB8500_THERMAL) += db8500_thermal.o > obj-$(CONFIG_ARMADA_THERMAL) += armada_thermal.o > diff --git a/drivers/thermal/bcm_kona_tmon.c b/drivers/thermal/bcm_kona_tmon.c > new file mode 100644 > index 0000000..69ae0b2 > --- /dev/null > +++ b/drivers/thermal/bcm_kona_tmon.c > @@ -0,0 +1,173 @@ > +/* > + * Copyright 2013 Broadcom Corporation. > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License, version 2, > + * as published by the Free Software Foundation (the "GPL"). > + * > + * This program is distributed in the hope that 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. > + * > + * A copy of the GPL is available at > http://www.broadcom.com/licenses/GPLv2.php, > + * or by writing to the Free Software Foundation, Inc., > + * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. > + */ > + > +/** > +* Broadcom Kona Temperature Monitor (TMON) driver > +* > +* Note: The TMON hardware monitors a single sensor. > +*/ > + > +#include <linux/clk.h> > +#include <linux/err.h> > +#include <linux/io.h> > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/platform_device.h> > +#include <linux/thermal.h> > + > + > +/* From TMON Register Database */ > +#define TMON_TEMP_VAL_OFFSET 0x0000001c > +#define TMON_TEMP_VAL_TEMP_VAL_SHIFT 0 > +#define TMON_TEMP_VAL_TEMP_VAL_MASK 0x000003ff > + > +/* Broadcom TMON Private Data Structure */ > +struct bcm_tmon_data_priv { > + void __iomem *base; > + struct clk *external_clk; > + struct thermal_zone_device *therm_dev; > +}; > + > +/* Temperature conversion function for TMON block */ > +static long raw_to_mcelsius(u32 raw) > +{ > + /* > + * According to Broadcom internal Analog Module Specification > + * the formula for converting TMON block output to temperature in > + * degree Celsius is: > + * T = 428 - (0.561 * raw) > + * Note: the valid operating range for the TMON block is -40C to 125C > + */ > + return 428000 - (561 * (long)raw); > +} > + > +/* Get temperature callback function for thermal zone */ > +static int bcm_get_temp(void *sensor_data, long *temp) > +{ > + u32 raw; > + long mcelsius; > + struct bcm_tmon_data_priv *priv = sensor_data; > + > + if (!priv) { > + pr_err("%s: input sensor_data not initialized.\n", __func__); > + return -EINVAL; > + } > + > + raw = (readl(priv->base + TMON_TEMP_VAL_OFFSET) > + & TMON_TEMP_VAL_TEMP_VAL_MASK) >> TMON_TEMP_VAL_TEMP_VAL_SHIFT; > + > + pr_debug("%s: raw temp 0x%x\n", __func__, raw); > + > + mcelsius = raw_to_mcelsius(raw); > + > + /* > + * Since 'mcelsius' might be negative, we need to limit it to smallest > + * unsigned value before returning it to thermal framework. > + */ > + if (mcelsius < 0) > + *temp = 0; > + else > + *temp = mcelsius; > + > + pr_debug("%s: final temp %d\n", __func__, (int) *temp); > + > + return 0; > +} > + > +static const struct of_device_id bcm_kona_tmon_match_table[] = { > + { .compatible = "brcm,kona-tmon" }, > + {}, > +}; > +MODULE_DEVICE_TABLE(of, bcm_kona_tmon_match_table); > + > +static int bcm_kona_tmon_probe(struct platform_device *pdev) > +{ > + struct thermal_zone_device *thermal = NULL; > + struct bcm_tmon_data_priv *priv; > + struct resource *res; > + > + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); > + if (!priv) { > + dev_err(&pdev->dev, "Failed to malloc priv.\n"); > + return -ENOMEM; > + } > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + priv->base = devm_ioremap_resource(&pdev->dev, res); > + if (IS_ERR(priv->base)) > + return PTR_ERR(priv->base); > + > + priv->external_clk = devm_clk_get(&pdev->dev, NULL); > + if (IS_ERR(priv->external_clk)) > + return -ENODEV; > + > + if (clk_prepare_enable(priv->external_clk) != 0) > + return -EINVAL; > + > + /* > + * Note that get_trend() function is NULL. This is OK for now as > + * we can rely on the get_tz_trend() from the Thermal Framework until > + * we come up with a better way to determine the trend. > + */ > + thermal = thermal_zone_of_sensor_register(&pdev->dev, 0, priv, > + bcm_get_temp, NULL); > + > + if (IS_ERR(thermal)) { > + dev_err(&pdev->dev, "Failed to register BCM Kona TMON.\n"); > + clk_disable_unprepare(priv->external_clk); > + return PTR_ERR(thermal); > + } > + > + priv->therm_dev = thermal; > + > + platform_set_drvdata(pdev, priv); > + > + dev_info(&pdev->dev, "BCM Kona TMON Initialized.\n"); > + > + return 0; > +} > + > +static int bcm_kona_tmon_remove(struct platform_device *pdev) > +{ > + struct bcm_tmon_data_priv *priv = platform_get_drvdata(pdev); > + > + thermal_zone_of_sensor_unregister(&pdev->dev, priv->therm_dev); > + > + clk_disable_unprepare(priv->external_clk); > + > + dev_info(&pdev->dev, "BCM Kona TMON Uninitialized.\n"); > + > + return 0; > +} > + > +static struct platform_driver bcm_kona_tmon_driver = { > + .driver = { > + .name = "bcm-kona-tmon", > + .owner = THIS_MODULE, > + .of_match_table = bcm_kona_tmon_match_table, > + }, > + .probe = bcm_kona_tmon_probe, > + .remove = bcm_kona_tmon_remove, > +}; > + > +module_platform_driver(bcm_kona_tmon_driver); > + > +MODULE_DESCRIPTION("Broadcom Kona Temperature Monitor Driver"); > +MODULE_AUTHOR("Broadcom Corporation"); > +MODULE_LICENSE("GPL v2"); > +MODULE_ALIAS("platform:bcm-kona-tmon"); > -- > 1.7.9.5 > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to [email protected] > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
