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Subject[PATCH v3 3/3] thermal: broadcom: Add Stingray thermal driver
Date
On 09/08/2018 14:54, Srinath Mannam wrote:
> From: Pramod Kumar <pramod.kumar@broadcom.com>
>
> Adds stingray thermal driver to monitor six
> thermal zones temperature and trips at critical temperature.

Hi Pramod,

could you elaborate a bit more the description? As you are introducing a
new driver it would be nice to give the sensor details.

> Signed-off-by: Pramod Kumar <pramod.kumar@broadcom.com>
> Signed-off-by: Srinath Mannam <srinath.mannam@broadcom.com>
> Reviewed-by: Ray Jui <ray.jui@broadcom.com>
> Reviewed-by: Scott Branden <scott.branden@broadcom.com>
> Reviewed-by: Vikram Prakash <vikram.prakash@broadcom.com>
> ---
> drivers/thermal/Kconfig | 3 +-
> drivers/thermal/broadcom/Kconfig | 9 ++
> drivers/thermal/broadcom/Makefile | 1 +
> drivers/thermal/broadcom/sr-thermal.c | 216 ++++++++++++++++++++++++++++++++++
> 4 files changed, 228 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..909f80c
> --- /dev/null
> +++ b/drivers/thermal/broadcom/sr-thermal.c
> @@ -0,0 +1,216 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2018 Broadcom
> + */
> +
> +#include <linux/acpi.h>
> +#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 */

I suggest to move this in the DT?

> +#define SR_TMON_MAX_LIST 6
> +
> +/*
> + * In stingray thermal IO memory,
> + * Total Number of available TMONs MASK is at offset 0
> + * temperature registers BASE is at 4 byte offset.
> + * Each TMON temperature register size is 4.
> + */
> +#define SR_TMON_TEMP_BASE(id) ((id) * 0x4)
> +
> +static const char * const sr_tmon_names[SR_TMON_MAX_LIST] = {

It will be more elegant to replace the macro SR_TMON_MAX_LIST by
ARRAY_SIZE(sr_tmon_names) and declare this array as:

static const char *const sr_tmon_name[] = {
...
};

> + "sr_tmon_ihost0",
> + "sr_tmon_ihost1",
> + "sr_tmon_ihost2",
> + "sr_tmon_ihost3",
> + "sr_tmon_crmu",
> + "sr_tmon_nitro",
> +};
> +
> +struct sr_tmon {
> + struct thermal_zone_device *tz;
> + unsigned int crit_temp;
> + unsigned int tmon_id;
> + struct sr_thermal *priv;
> +};
> +
> +struct sr_thermal {
> + struct device *dev;

This field is used for dev_dbg, may be it could be removed along with
the dev_dbg message?

> + void __iomem *regs;
> + struct sr_tmon tmon[SR_TMON_MAX_LIST];
> +};
> +
> +static int sr_get_temp(struct thermal_zone_device *tz, int *temp)
> +{
> + struct sr_tmon *tmon = tz->devdata;
> + struct sr_thermal *sr_thermal = tmon->priv;
> +
> + *temp = readl(sr_thermal->regs + SR_TMON_TEMP_BASE(tmon->tmon_id));
> +
> + return 0;
> +}
> +
> +static int sr_get_trip_type(struct thermal_zone_device *tz, int trip,
> + enum thermal_trip_type *type)
> +{
> + struct sr_tmon *tmon = tz->devdata;
> + struct sr_thermal *sr_thermal = tmon->priv;
> +
> + 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_tmon *tmon = tz->devdata;
> + struct sr_thermal *sr_thermal = tmon->priv;
> +
> + switch (trip) {
> + case 0:
> + *temp = tmon->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_tmon *tmon = 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.
> + */

Couldn't the user harm the hardware with a too high value?

Why not define this value in the DT?

> + tmon->crit_temp = temp;
> + break;
> + default:
> + return -EINVAL;
> + }
> + return 0;
> +}

Is it possible to factor out these 3 functions above and remove the
'switch' in all of them ?

> +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 sr_tmon *tmon;
> + struct resource *res;
> + uint32_t sr_tmon_list = 0;
> + unsigned int i;
> + int ret;
> +
> + 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 = (void __iomem *)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);
> + }
> +
> + ret = device_property_read_u32(dev, "brcm,tmon-mask", &sr_tmon_list);
> + if (ret)
> + return ret;
> +
> + for (i = 0; i < SR_TMON_MAX_LIST; i++) {
> +
> + if (!(sr_tmon_list & BIT(i)))
> + continue;
> +
> + /* Flush temperature registers */
> + writel(0, sr_thermal->regs + SR_TMON_TEMP_BASE(i));
> + tmon = &sr_thermal->tmon[i];

It is possible to initialize tmon to:

tmon = &sr_thermal->tmon;

and then use the pointer increment:
tmon++;


> + tmon->crit_temp = TMON_CRIT_TEMP;
> + tmon->tmon_id = i;
> + tmon->priv = sr_thermal;
> + tmon->tz = thermal_zone_device_register(sr_tmon_names[i],
> + 1, 1,
> + tmon,
> + &sr_thermal_ops,
> + NULL, 1000, 1000);
> + if (IS_ERR(tmon->tz))
> + goto err_exit;
> +
> + dev_info(dev, "%s: registered\n", sr_tmon_names[i]);
> + }
> + platform_set_drvdata(pdev, sr_thermal);
> +
> + return 0;
> +
> +err_exit:
> + while (--i >= 0) {
> + if (sr_thermal->tmon[i].tz)
> + thermal_zone_device_unregister(sr_thermal->tmon[i].tz);
> + }
> +
> + return PTR_ERR(tmon->tz);
> +}
> +
> +static int sr_thermal_remove(struct platform_device *pdev)
> +{
> + struct sr_thermal *sr_thermal = platform_get_drvdata(pdev);
> + unsigned int i;
> +
> + for (i = 0; i < SR_TMON_MAX_LIST; i++)
> + if (sr_thermal->tmon[i].tz)
> + thermal_zone_device_unregister(sr_thermal->tmon[i].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 const struct acpi_device_id sr_thermal_acpi_ids[] = {
> + { .id = "BRCM0500" },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(acpi, sr_thermal_acpi_ids);
> +
> +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,
> + .acpi_match_table = ACPI_PTR(sr_thermal_acpi_ids),
> + },
> +};
> +module_platform_driver(sr_thermal_driver);
> +
> +MODULE_AUTHOR("Pramod Kumar <pramod.kumar@broadcom.com>");
> +MODULE_DESCRIPTION("Stingray thermal driver");
> +MODULE_LICENSE("GPL v2");
>


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