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The driver only provides SoC temperature reading so far. Signed-off-by: Stefan Wahren --- drivers/thermal/broadcom/Kconfig | 8 ++ drivers/thermal/broadcom/Makefile | 1 + drivers/thermal/broadcom/bcm2711_thermal.c | 146 +++++++++++++++++++++++++++++ 3 files changed, 155 insertions(+) create mode 100644 drivers/thermal/broadcom/bcm2711_thermal.c -- 2.7.4 diff --git a/drivers/thermal/broadcom/Kconfig b/drivers/thermal/broadcom/Kconfig index cf43e15..b970295 100644 --- a/drivers/thermal/broadcom/Kconfig +++ b/drivers/thermal/broadcom/Kconfig @@ -1,4 +1,12 @@ # SPDX-License-Identifier: GPL-2.0-only +config BCM2711_THERMAL + tristate "Broadcom AVS RO thermal sensor driver" + depends on ARCH_BCM2835 || COMPILE_TEST + depends on HAS_IOMEM + depends on THERMAL_OF + help + Support for thermal sensors on Broadcom BCM2711 SoCs. + config BCM2835_THERMAL tristate "Thermal sensors on bcm2835 SoC" depends on ARCH_BCM2835 || COMPILE_TEST diff --git a/drivers/thermal/broadcom/Makefile b/drivers/thermal/broadcom/Makefile index 490ab1f..c917b24 100644 --- a/drivers/thermal/broadcom/Makefile +++ b/drivers/thermal/broadcom/Makefile @@ -1,4 +1,5 @@ # SPDX-License-Identifier: GPL-2.0-only +obj-$(CONFIG_BCM2711_THERMAL) += bcm2711_thermal.o obj-$(CONFIG_BCM2835_THERMAL) += bcm2835_thermal.o obj-$(CONFIG_BRCMSTB_THERMAL) += brcmstb_thermal.o obj-$(CONFIG_BCM_NS_THERMAL) += ns-thermal.o diff --git a/drivers/thermal/broadcom/bcm2711_thermal.c b/drivers/thermal/broadcom/bcm2711_thermal.c new file mode 100644 index 0000000..214a305 --- /dev/null +++ b/drivers/thermal/broadcom/bcm2711_thermal.c @@ -0,0 +1,146 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Broadcom AVS RO thermal sensor driver + * + * based on brcmstb_thermal + * + * Copyright (C) 2019 Stefan Wahren + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "../thermal_hwmon.h" + +#define AVS_RO_TEMP_STATUS 0x00 + #define AVS_RO_TEMP_STATUS_valid_msk (BIT(16) | BIT(10)) + #define AVS_RO_TEMP_STATUS_data_msk GENMASK(9, 0) + +struct bcm2711_thermal_priv { + void __iomem *base; + struct device *dev; + struct clk *clk; + struct thermal_zone_device *thermal; +}; + +static int bcm2711_get_temp(void *data, int *temp) +{ + struct bcm2711_thermal_priv *priv = data; + int slope = thermal_zone_get_slope(priv->thermal); + int offset = thermal_zone_get_offset(priv->thermal); + u32 val; + long t; + + val = __raw_readl(priv->base + AVS_RO_TEMP_STATUS); + + if (!(val & AVS_RO_TEMP_STATUS_valid_msk)) { + dev_err(priv->dev, "reading not valid\n"); + return -EIO; + } + + val &= AVS_RO_TEMP_STATUS_data_msk; + + /* Convert a HW code to a temperature reading (millidegree celsius) */ + t = slope * val + offset; + if (t < 0) + *temp = 0; + else + *temp = t; + + return 0; +} + +static const struct thermal_zone_of_device_ops bcm2711_thermal_of_ops = { + .get_temp = bcm2711_get_temp, +}; + +static const struct of_device_id bcm2711_thermal_id_table[] = { + { .compatible = "brcm,bcm2711-thermal" }, + {}, +}; +MODULE_DEVICE_TABLE(of, bcm2711_thermal_id_table); + +static int bcm2711_thermal_probe(struct platform_device *pdev) +{ + struct thermal_zone_device *thermal; + struct bcm2711_thermal_priv *priv; + struct resource *res; + int ret; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + 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->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(priv->clk)) { + ret = PTR_ERR(priv->clk); + if (ret != -EPROBE_DEFER) + dev_err(&pdev->dev, "could not get clk: %d\n", ret); + return ret; + } + + ret = clk_prepare_enable(priv->clk); + if (ret) + return ret; + + priv->dev = &pdev->dev; + platform_set_drvdata(pdev, priv); + + thermal = devm_thermal_zone_of_sensor_register(&pdev->dev, 0, priv, + &bcm2711_thermal_of_ops); + if (IS_ERR(thermal)) { + ret = PTR_ERR(thermal); + dev_err(&pdev->dev, "could not register sensor: %d\n", ret); + goto err_clk; + } + + priv->thermal = thermal; + + thermal->tzp->no_hwmon = false; + ret = thermal_add_hwmon_sysfs(thermal); + if (ret) + return ret; + + return 0; + +err_clk: + clk_disable_unprepare(priv->clk); + + return ret; +} + +static int bcm2711_thermal_remove(struct platform_device *pdev) +{ + struct bcm2711_thermal_priv *priv = platform_get_drvdata(pdev); + + clk_disable_unprepare(priv->clk); + + return 0; +} + +static struct platform_driver bcm2711_thermal_driver = { + .probe = bcm2711_thermal_probe, + .remove = bcm2711_thermal_remove, + .driver = { + .name = "bcm2711_thermal", + .of_match_table = bcm2711_thermal_id_table, + }, +}; +module_platform_driver(bcm2711_thermal_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Stefan Wahren"); +MODULE_DESCRIPTION("Broadcom AVS RO thermal sensor driver");