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Date: Mon, 28 May 2018 11:11:24 +0530 From: Srinath Mannam <srinath.mannam@...adcom.com> To: Zhang Rui <rui.zhang@...el.com>, Eduardo Valentin <edubezval@...il.com>, Rob Herring <robh+dt@...nel.org>, Mark Rutland <mark.rutland@....com> Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, bcm-kernel-feedback-list@...adcom.com, Pramod Kumar <pramod.kumar@...adcom.com>, Srinath Mannam <srinath.mannam@...adcom.com> Subject: [PATCH 3/3] thermal: broadcom: Add Stingray thermal driver From: Pramod Kumar <pramod.kumar@...adcom.com> This commit adds stingray thermal driver to monitor six thermal zones temperature and trips at critical temperature. Signed-off-by: Pramod Kumar <pramod.kumar@...adcom.com> Signed-off-by: Srinath Mannam <srinath.mannam@...adcom.com> Reviewed-by: Ray Jui <ray.jui@...adcom.com> Reviewed-by: Scott Branden <scott.branden@...adcom.com> Reviewed-by: Vikram Prakash <vikram.prakash@...adcom.com> --- drivers/thermal/Kconfig | 3 +- drivers/thermal/broadcom/Kconfig | 9 ++ drivers/thermal/broadcom/Makefile | 1 + drivers/thermal/broadcom/sr-thermal.c | 151 ++++++++++++++++++++++++++++++++++ 4 files changed, 163 insertions(+), 1 deletion(-) create mode 100644 drivers/thermal/broadcom/sr-thermal.c diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index 8297988..26d39d4 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -416,7 +416,8 @@ config MTK_THERMAL controller present in Mediatek SoCs menu "Broadcom thermal drivers" -depends on ARCH_BCM || ARCH_BRCMSTB || ARCH_BCM2835 || COMPILE_TEST +depends on ARCH_BCM || ARCH_BRCMSTB || ARCH_BCM2835 || ARCH_BCM_IPROC || \ + COMPILE_TEST source "drivers/thermal/broadcom/Kconfig" endmenu diff --git a/drivers/thermal/broadcom/Kconfig b/drivers/thermal/broadcom/Kconfig index c106a15..dc9a9bd 100644 --- a/drivers/thermal/broadcom/Kconfig +++ b/drivers/thermal/broadcom/Kconfig @@ -22,3 +22,12 @@ config BCM_NS_THERMAL BCM4708, BCM4709, BCM5301x, BCM95852X, etc). It contains DMU (Device Management Unit) block with a thermal sensor that allows checking CPU temperature. + +config BCM_SR_THERMAL + tristate "Stingray thermal driver" + depends on ARCH_BCM_IPROC || COMPILE_TEST + default ARCH_BCM_IPROC + help + Support for the Stingray family of SoCs. Its different blocks like + iHost, CRMU and NITRO has thermal sensor that allows checking its + temperature. diff --git a/drivers/thermal/broadcom/Makefile b/drivers/thermal/broadcom/Makefile index fae10ec..79df69e 100644 --- a/drivers/thermal/broadcom/Makefile +++ b/drivers/thermal/broadcom/Makefile @@ -1,3 +1,4 @@ obj-$(CONFIG_BCM2835_THERMAL) += bcm2835_thermal.o obj-$(CONFIG_BRCMSTB_THERMAL) += brcmstb_thermal.o obj-$(CONFIG_BCM_NS_THERMAL) += ns-thermal.o +obj-$(CONFIG_BCM_SR_THERMAL) += sr-thermal.o diff --git a/drivers/thermal/broadcom/sr-thermal.c b/drivers/thermal/broadcom/sr-thermal.c new file mode 100644 index 0000000..5baaa6e --- /dev/null +++ b/drivers/thermal/broadcom/sr-thermal.c @@ -0,0 +1,151 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2018 Broadcom + */ + +#include <linux/module.h> +#include <linux/of_address.h> +#include <linux/platform_device.h> +#include <linux/thermal.h> + +#define TMON_CRIT_TEMP 105000 /* temp in millidegree C */ + +struct sr_thermal { + struct thermal_zone_device *tz; + struct device *dev; + void __iomem *regs; + unsigned int crit_temp; +}; + +static int sr_get_temp(struct thermal_zone_device *tz, int *temp) +{ + struct sr_thermal *sr_thermal = tz->devdata; + + *temp = readl(sr_thermal->regs); + + return 0; +} + +static int sr_get_trip_type(struct thermal_zone_device *tz, int trip, + enum thermal_trip_type *type) +{ + struct sr_thermal *sr_thermal = tz->devdata; + + switch (trip) { + case 0: + *type = THERMAL_TRIP_CRITICAL; + break; + default: + dev_dbg(sr_thermal->dev, + "Driver does not support more than 1 trip point\n"); + return -EINVAL; + } + return 0; +} + +static int sr_get_trip_temp(struct thermal_zone_device *tz, int trip, int *temp) +{ + struct sr_thermal *sr_thermal = tz->devdata; + + switch (trip) { + case 0: + *temp = sr_thermal->crit_temp; + break; + default: + dev_dbg(sr_thermal->dev, + "Driver does not support more than 1 trip point\n"); + return -EINVAL; + } + return 0; +} + +static int sr_set_trip_temp(struct thermal_zone_device *tz, int trip, int temp) +{ + struct sr_thermal *sr_thermal = tz->devdata; + + switch (trip) { + case 0: + /* + * Allow the user to change critical temperature + * as per their requirement, could be for debug + * purpose, even if it's more than the recommended + * critical temperature. + */ + sr_thermal->crit_temp = temp; + break; + default: + return -EINVAL; + } + return 0; +} + +static struct thermal_zone_device_ops sr_thermal_ops = { + .get_temp = sr_get_temp, + .get_trip_type = sr_get_trip_type, + .get_trip_temp = sr_get_trip_temp, + .set_trip_temp = sr_set_trip_temp, +}; + +static int sr_thermal_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct sr_thermal *sr_thermal; + struct resource *res; + + sr_thermal = devm_kzalloc(dev, sizeof(*sr_thermal), GFP_KERNEL); + if (!sr_thermal) + return -ENOMEM; + sr_thermal->dev = dev; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + sr_thermal->regs = devm_memremap(&pdev->dev, res->start, + resource_size(res), MEMREMAP_WB); + if (IS_ERR(sr_thermal->regs)) { + dev_err(dev, "failed to get io address\n"); + return PTR_ERR(sr_thermal->regs); + } + + /* initialize tmon value to 0 */ + writel(0, sr_thermal->regs); + sr_thermal->crit_temp = TMON_CRIT_TEMP; + + sr_thermal->tz = thermal_zone_device_register(dev_name(dev), 1, 1, + sr_thermal, + &sr_thermal_ops, + NULL, 1000, 1000); + if (IS_ERR(sr_thermal->tz)) + return PTR_ERR(sr_thermal->tz); + + platform_set_drvdata(pdev, sr_thermal); + + return 0; +} + +static int sr_thermal_remove(struct platform_device *pdev) +{ + struct sr_thermal *sr_thermal = platform_get_drvdata(pdev); + + thermal_zone_device_unregister(sr_thermal->tz); + + return 0; +} + +static const struct of_device_id sr_thermal_of_match[] = { + { .compatible = "brcm,sr-thermal", }, + {}, +}; +MODULE_DEVICE_TABLE(of, sr_thermal_of_match); + +static struct platform_driver sr_thermal_driver = { + .probe = sr_thermal_probe, + .remove = sr_thermal_remove, + .driver = { + .name = "sr-thermal", + .of_match_table = sr_thermal_of_match, + }, +}; +module_platform_driver(sr_thermal_driver); + +MODULE_AUTHOR("Pramod Kumar <pramod.kumar@...adcom.com>"); +MODULE_DESCRIPTION("Stingray thermal driver"); +MODULE_LICENSE("GPL v2"); -- 2.7.4
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