Subject: Re: [PATCH v5 2/2] thermal: add brcmstb AVS TMON driver
To: Markus Mayer <code@mmayer.net>
References: <20170926212800.4879-1-code@mmayer.net>
 <20170926212800.4879-3-code@mmayer.net>
 <4cb98266-6936-7668-fc88-199ac907b437@broadcom.com>
 <CANEuBv7pij+szVQZHZxNr4kXcCT0miTsYzG7g28zOmF9MqXKJQ@mail.gmail.com>
Cc: Zhang Rui <rui.zhang@intel.com>,
        Eduardo Valentin <edubezval@gmail.com>,
        Rob Herring <robh+dt@kernel.org>, Mark Rutland <mark.rutland@arm.com>,
        Doug Berger <opendmb@gmail.com>,
        Brian Norris <computersforpeace@gmail.com>,
        Gregory Fong <gregory.0xf0@gmail.com>,
        Florian Fainelli <f.fainelli@gmail.com>,
        =?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?= <rafal@milecki.pl>,
        Broadcom Kernel List <bcm-kernel-feedback-list@broadcom.com>,
        Power Management List <linux-pm@vger.kernel.org>,
        Device Tree List <devicetree@vger.kernel.org>,
        ARM Kernel List <linux-arm-kernel@lists.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Markus Mayer <mmayer@broadcom.com>
From: Scott Branden <scott.branden@broadcom.com>
Message-ID: <9bdd9959-da47-9adb-e550-31bf06254310@broadcom.com>
Date: Tue, 26 Sep 2017 15:08:28 -0700
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On 17-09-26 02:38 PM, Markus Mayer wrote:
> On 26 September 2017 at 14:32, Scott Branden <scott.branden@broadcom.com> wrote:
>> Hi Markus,
>>
>>
>> On 17-09-26 02:27 PM, Markus Mayer wrote:
>>> From: Brian Norris <computersforpeace@gmail.com>
>>>
>>> The AVS TMON core provides temperature readings, a pair of configurable
>>> high- and low-temperature threshold interrupts, and an emergency
>>> over-temperature chip reset. The driver utilizes the first two to
>>> provide temperature readings and high-temperature notifications to
>>> applications. The over-temperature reset is not exposed to
>>> applications; this reset threshold is critical to the system and should
>>> be set with care within the bootloader.
>>>
>>> Applications may choose to utilize the notification mechanism, the
>>> temperature reading mechanism (e.g., through polling), or both.
>>>
>>> Signed-off-by: Brian Norris <computersforpeace@gmail.com>
>>> Signed-off-by: Doug Berger <opendmb@gmail.com>
>>> Signed-off-by: Markus Mayer <mmayer@broadcom.com>
>>> ---
>>>    drivers/thermal/Kconfig                    |   2 +-
>>>    drivers/thermal/broadcom/Kconfig           |   7 +
>>>    drivers/thermal/broadcom/Makefile          |   1 +
>>>    drivers/thermal/broadcom/brcmstb_thermal.c | 387
>>> +++++++++++++++++++++++++++++
>>>    4 files changed, 396 insertions(+), 1 deletion(-)
>>>    create mode 100644 drivers/thermal/broadcom/brcmstb_thermal.c
>>>
>>> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
>>> index 07002df..96774a7 100644
>>> --- a/drivers/thermal/Kconfig
>>> +++ b/drivers/thermal/Kconfig
>>> @@ -408,7 +408,7 @@ config MTK_THERMAL
>>>            controller present in Mediatek SoCs
>>>      menu "Broadcom thermal drivers"
>>> -depends on ARCH_BCM || COMPILE_TEST
>>> +depends on ARCH_BCM || ARCH_BRCMSTB || COMPILE_TEST
>> No need for this additional depends.  ARCH_BCM is always defined before
>> ARCH_BRCMSTB can be selected.
> ARCH_BCM does not exist in arch/arm64/configs/defconfig. ARCH_BRCMSTB
> does. So, we do need both or the driver won't be built on ARM64.
> (After internal discussions we went with that approach rather than
> defining ARCH_BCM on ARM64.)
Got it.  Looking at our internal iproc tree I see we've done exactly the 
same with ARCH_BCM_IPROC needing to be added.  We haven't upstreamed
the thermal driver needing it yet.

Perhaps we should add ARCH_BCM to ARM64....

>
>>>    source "drivers/thermal/broadcom/Kconfig"
>>>    endmenu
>>>    diff --git a/drivers/thermal/broadcom/Kconfig
>>> b/drivers/thermal/broadcom/Kconfig
>>> index 42c098e..c106a15 100644
>>> --- a/drivers/thermal/broadcom/Kconfig
>>> +++ b/drivers/thermal/broadcom/Kconfig
>>> @@ -6,6 +6,13 @@ config BCM2835_THERMAL
>>>          help
>>>            Support for thermal sensors on Broadcom bcm2835 SoCs.
>>>    +config BRCMSTB_THERMAL
>>> +       tristate "Broadcom STB AVS TMON thermal driver"
>>> +       depends on ARCH_BRCMSTB || COMPILE_TEST
>>> +       help
>>> +         Enable this driver if you have a Broadcom STB SoC and would like
>>> +         thermal framework support.
>>> +
>>>    config BCM_NS_THERMAL
>>>          tristate "Northstar thermal driver"
>>>          depends on ARCH_BCM_IPROC || COMPILE_TEST
>>> diff --git a/drivers/thermal/broadcom/Makefile
>>> b/drivers/thermal/broadcom/Makefile
>>> index c6f62e4..fae10ec 100644
>>> --- a/drivers/thermal/broadcom/Makefile
>>> +++ b/drivers/thermal/broadcom/Makefile
>>> @@ -1,2 +1,3 @@
>>>    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/brcmstb_thermal.c
>>> b/drivers/thermal/broadcom/brcmstb_thermal.c
>>> new file mode 100644
>>> index 0000000..1919f91
>>> --- /dev/null
>>> +++ b/drivers/thermal/broadcom/brcmstb_thermal.c
>>> @@ -0,0 +1,387 @@
>>>
>>> +/*
>>> + * Broadcom STB AVS TMON thermal sensor driver
>>> + *
>>> + * Copyright (c) 2015-2017 Broadcom
>>> + *
>>> + * This software is licensed under the terms of the GNU General Public
>>> + * License version 2, as published by the Free Software Foundation, and
>>> + * may be copied, distributed, and modified under those terms.
>>> + *
>>> + * 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.
>>> + *
>>> + */
>>> +
>>> +#define DRV_NAME       "brcmstb_thermal"
>>> +
>>> +#define pr_fmt(fmt)    DRV_NAME ": " fmt
>>> +
>>> +#include <linux/bitops.h>
>>> +#include <linux/device.h>
>>> +#include <linux/err.h>
>>> +#include <linux/io.h>
>>> +#include <linux/irqreturn.h>
>>> +#include <linux/interrupt.h>
>>> +#include <linux/kernel.h>
>>> +#include <linux/module.h>
>>> +#include <linux/platform_device.h>
>>> +#include <linux/of_device.h>
>>> +#include <linux/thermal.h>
>>> +
>>> +#define AVS_TMON_STATUS                        0x00
>>> + #define AVS_TMON_STATUS_valid_msk     BIT(11)
>>> + #define AVS_TMON_STATUS_data_msk      GENMASK(10, 1)
>>> + #define AVS_TMON_STATUS_data_shift    1
>>> +
>>> +#define AVS_TMON_EN_OVERTEMP_RESET     0x04
>>> + #define AVS_TMON_EN_OVERTEMP_RESET_msk        BIT(0)
>>> +
>>> +#define AVS_TMON_RESET_THRESH          0x08
>>> + #define AVS_TMON_RESET_THRESH_msk     GENMASK(10, 1)
>>> + #define AVS_TMON_RESET_THRESH_shift   1
>>> +
>>> +#define AVS_TMON_INT_IDLE_TIME         0x10
>>> +
>>> +#define AVS_TMON_EN_TEMP_INT_SRCS      0x14
>>> + #define AVS_TMON_EN_TEMP_INT_SRCS_high        BIT(1)
>>> + #define AVS_TMON_EN_TEMP_INT_SRCS_low BIT(0)
>>> +
>>> +#define AVS_TMON_INT_THRESH            0x18
>>> + #define AVS_TMON_INT_THRESH_high_msk  GENMASK(26, 17)
>>> + #define AVS_TMON_INT_THRESH_high_shift        17
>>> + #define AVS_TMON_INT_THRESH_low_msk   GENMASK(10, 1)
>>> + #define AVS_TMON_INT_THRESH_low_shift 1
>>> +
>>> +#define AVS_TMON_TEMP_INT_CODE         0x1c
>>> +#define AVS_TMON_TP_TEST_ENABLE                0x20
>>> +
>>> +/* Default coefficients */
>>> +#define AVS_TMON_TEMP_SLOPE            -487
>>> +#define AVS_TMON_TEMP_OFFSET           410040
>>> +
>>> +/* HW related temperature constants */
>>> +#define AVS_TMON_TEMP_MAX              0x3ff
>>> +#define AVS_TMON_TEMP_MIN              -88161
>>> +#define AVS_TMON_TEMP_MASK             AVS_TMON_TEMP_MAX
>>> +
>>> +enum avs_tmon_trip_type {
>>> +       TMON_TRIP_TYPE_LOW = 0,
>>> +       TMON_TRIP_TYPE_HIGH,
>>> +       TMON_TRIP_TYPE_RESET,
>>> +       TMON_TRIP_TYPE_MAX,
>>> +};
>>> +
>>> +struct avs_tmon_trip {
>>> +       /* HW bit to enable the trip */
>>> +       u32 enable_offs;
>>> +       u32 enable_mask;
>>> +
>>> +       /* HW field to read the trip temperature */
>>> +       u32 reg_offs;
>>> +       u32 reg_msk;
>>> +       int reg_shift;
>>> +};
>>> +
>>> +static struct avs_tmon_trip avs_tmon_trips[] = {
>>> +       /* Trips when temperature is below threshold */
>>> +       [TMON_TRIP_TYPE_LOW] = {
>>> +               .enable_offs    = AVS_TMON_EN_TEMP_INT_SRCS,
>>> +               .enable_mask    = AVS_TMON_EN_TEMP_INT_SRCS_low,
>>> +               .reg_offs       = AVS_TMON_INT_THRESH,
>>> +               .reg_msk        = AVS_TMON_INT_THRESH_low_msk,
>>> +               .reg_shift      = AVS_TMON_INT_THRESH_low_shift,
>>> +       },
>>> +       /* Trips when temperature is above threshold */
>>> +       [TMON_TRIP_TYPE_HIGH] = {
>>> +               .enable_offs    = AVS_TMON_EN_TEMP_INT_SRCS,
>>> +               .enable_mask    = AVS_TMON_EN_TEMP_INT_SRCS_high,
>>> +               .reg_offs       = AVS_TMON_INT_THRESH,
>>> +               .reg_msk        = AVS_TMON_INT_THRESH_high_msk,
>>> +               .reg_shift      = AVS_TMON_INT_THRESH_high_shift,
>>> +       },
>>> +       /* Automatically resets chip when above threshold */
>>> +       [TMON_TRIP_TYPE_RESET] = {
>>> +               .enable_offs    = AVS_TMON_EN_OVERTEMP_RESET,
>>> +               .enable_mask    = AVS_TMON_EN_OVERTEMP_RESET_msk,
>>> +               .reg_offs       = AVS_TMON_RESET_THRESH,
>>> +               .reg_msk        = AVS_TMON_RESET_THRESH_msk,
>>> +               .reg_shift      = AVS_TMON_RESET_THRESH_shift,
>>> +       },
>>> +};
>>> +
>>> +struct brcmstb_thermal_priv {
>>> +       void __iomem *tmon_base;
>>> +       struct device *dev;
>>> +       struct thermal_zone_device *thermal;
>>> +};
>>> +
>>> +static void avs_tmon_get_coeffs(struct thermal_zone_device *tz, int
>>> *slope,
>>> +                               int *offset)
>>> +{
>>> +       *slope = thermal_zone_get_slope(tz);
>>> +       *offset = thermal_zone_get_offset(tz);
>>> +}
>>> +
>>> +/* Convert a HW code to a temperature reading (millidegree celsius) */
>>> +static inline int avs_tmon_code_to_temp(struct thermal_zone_device *tz,
>>> +                                       u32 code)
>>> +{
>>> +       const int val = code & AVS_TMON_TEMP_MASK;
>>> +       int slope, offset;
>>> +
>>> +       avs_tmon_get_coeffs(tz, &slope, &offset);
>>> +
>>> +       return slope * val + offset;
>>> +}
>>> +
>>> +/*
>>> + * Convert a temperature value (millidegree celsius) to a HW code
>>> + *
>>> + * @temp: temperature to convert
>>> + * @low: if true, round toward the low side
>>> + */
>>> +static inline u32 avs_tmon_temp_to_code(struct thermal_zone_device *tz,
>>> +                                       int temp, bool low)
>>> +{
>>> +       int slope, offset;
>>> +
>>> +       if (temp < AVS_TMON_TEMP_MIN)
>>> +               return AVS_TMON_TEMP_MAX; /* Maximum code value */
>>> +
>>> +       avs_tmon_get_coeffs(tz, &slope, &offset);
>>> +
>>> +       if (temp >= offset)
>>> +               return 0;       /* Minimum code value */
>>> +
>>> +       if (low)
>>> +               return (u32)(DIV_ROUND_UP(offset - temp, abs(slope)));
>>> +       else
>>> +               return (u32)((offset - temp) / abs(slope));
>>> +}
>>> +
>>> +static int brcmstb_get_temp(void *data, int *temp)
>>> +{
>>> +       struct brcmstb_thermal_priv *priv = data;
>>> +       u32 val;
>>> +       long t;
>>> +
>>> +       val = __raw_readl(priv->tmon_base + AVS_TMON_STATUS);
>>> +
>>> +       if (!(val & AVS_TMON_STATUS_valid_msk)) {
>>> +               dev_err(priv->dev, "reading not valid\n");
>>> +               return -EIO;
>>> +       }
>>> +
>>> +       val = (val & AVS_TMON_STATUS_data_msk) >>
>>> AVS_TMON_STATUS_data_shift;
>>> +
>>> +       t = avs_tmon_code_to_temp(priv->thermal, val);
>>> +       if (t < 0)
>>> +               *temp = 0;
>>> +       else
>>> +               *temp = t;
>>> +
>>> +       return 0;
>>> +}
>>> +
>>> +static void avs_tmon_trip_enable(struct brcmstb_thermal_priv *priv,
>>> +                                enum avs_tmon_trip_type type, int en)
>>> +{
>>> +       struct avs_tmon_trip *trip = &avs_tmon_trips[type];
>>> +       u32 val = __raw_readl(priv->tmon_base + trip->enable_offs);
>>> +
>>> +       dev_dbg(priv->dev, "%sable trip, type %d\n", en ? "en" : "dis",
>>> type);
>>> +
>>> +       if (en)
>>> +               val |= trip->enable_mask;
>>> +       else
>>> +               val &= ~trip->enable_mask;
>>> +
>>> +       __raw_writel(val, priv->tmon_base + trip->enable_offs);
>>> +}
>>> +
>>> +static int avs_tmon_get_trip_temp(struct brcmstb_thermal_priv *priv,
>>> +                                 enum avs_tmon_trip_type type)
>>> +{
>>> +       struct avs_tmon_trip *trip = &avs_tmon_trips[type];
>>> +       u32 val = __raw_readl(priv->tmon_base + trip->reg_offs);
>>> +
>>> +       val &= trip->reg_msk;
>>> +       val >>= trip->reg_shift;
>>> +
>>> +       return avs_tmon_code_to_temp(priv->thermal, val);
>>> +}
>>> +
>>> +static void avs_tmon_set_trip_temp(struct brcmstb_thermal_priv *priv,
>>> +                                  enum avs_tmon_trip_type type,
>>> +                                  int temp)
>>> +{
>>> +       struct avs_tmon_trip *trip = &avs_tmon_trips[type];
>>> +       u32 val, orig;
>>> +
>>> +       dev_dbg(priv->dev, "set temp %d to %d\n", type, temp);
>>> +
>>> +       /* round toward low temp for the low interrupt */
>>> +       val = avs_tmon_temp_to_code(priv->thermal, temp,
>>> +                                   type == TMON_TRIP_TYPE_LOW);
>>> +
>>> +       val <<= trip->reg_shift;
>>> +       val &= trip->reg_msk;
>>> +
>>> +       orig = __raw_readl(priv->tmon_base + trip->reg_offs);
>>> +       orig &= ~trip->reg_msk;
>>> +       orig |= val;
>>> +       __raw_writel(orig, priv->tmon_base + trip->reg_offs);
>>> +}
>>> +
>>> +static int avs_tmon_get_intr_temp(struct brcmstb_thermal_priv *priv)
>>> +{
>>> +       u32 val;
>>> +
>>> +       val = __raw_readl(priv->tmon_base + AVS_TMON_TEMP_INT_CODE);
>>> +       return avs_tmon_code_to_temp(priv->thermal, val);
>>> +}
>>> +
>>> +static irqreturn_t brcmstb_tmon_irq_thread(int irq, void *data)
>>> +{
>>> +       struct brcmstb_thermal_priv *priv = data;
>>> +       int low, high, intr;
>>> +
>>> +       low = avs_tmon_get_trip_temp(priv, TMON_TRIP_TYPE_LOW);
>>> +       high = avs_tmon_get_trip_temp(priv, TMON_TRIP_TYPE_HIGH);
>>> +       intr = avs_tmon_get_intr_temp(priv);
>>> +
>>> +       dev_dbg(priv->dev, "low/intr/high: %d/%d/%d\n",
>>> +                       low, intr, high);
>>> +
>>> +       /* Disable high-temp until next threshold shift */
>>> +       if (intr >= high)
>>> +               avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_HIGH, 0);
>>> +       /* Disable low-temp until next threshold shift */
>>> +       if (intr <= low)
>>> +               avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_LOW, 0);
>>> +
>>> +       /*
>>> +        * Notify using the interrupt temperature, in case the temperature
>>> +        * changes before it can next be read out
>>> +        */
>>> +       thermal_zone_device_update(priv->thermal, intr);
>>> +
>>> +       return IRQ_HANDLED;
>>> +}
>>> +
>>> +static int brcmstb_set_trips(void *data, int low, int high)
>>> +{
>>> +       struct brcmstb_thermal_priv *priv = data;
>>> +
>>> +       dev_dbg(priv->dev, "set trips %d <--> %d\n", low, high);
>>> +
>>> +       /*
>>> +        * Disable low-temp if "low" is too small. As per thermal
>>> framework
>>> +        * API, we use -INT_MAX rather than INT_MIN.
>>> +        */
>>> +       if (low <= -INT_MAX) {
>>> +               avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_LOW, 0);
>>> +       } else {
>>> +               avs_tmon_set_trip_temp(priv, TMON_TRIP_TYPE_LOW, low);
>>> +               avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_LOW, 1);
>>> +       }
>>> +
>>> +       /* Disable high-temp if "high" is too big. */
>>> +       if (high == INT_MAX) {
>>> +               avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_HIGH, 0);
>>> +       } else {
>>> +               avs_tmon_set_trip_temp(priv, TMON_TRIP_TYPE_HIGH, high);
>>> +               avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_HIGH, 1);
>>> +       }
>>> +
>>> +       return 0;
>>> +}
>>> +
>>> +static struct thermal_zone_of_device_ops of_ops = {
>>> +       .get_temp       = brcmstb_get_temp,
>>> +       .set_trips      = brcmstb_set_trips,
>>> +};
>>> +
>>> +static const struct of_device_id brcmstb_thermal_id_table[] = {
>>> +       { .compatible = "brcm,avs-tmon" },
>>> +       {},
>>> +};
>>> +MODULE_DEVICE_TABLE(of, brcmstb_thermal_id_table);
>>> +
>>> +static int brcmstb_thermal_probe(struct platform_device *pdev)
>>> +{
>>> +       struct thermal_zone_device *thermal;
>>> +       struct brcmstb_thermal_priv *priv;
>>> +       struct resource *res;
>>> +       int irq, ret;
>>> +
>>> +       priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
>>> +       if (!priv)
>>> +               return -ENOMEM;
>>> +
>>> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>> +       priv->tmon_base = devm_ioremap_resource(&pdev->dev, res);
>>> +       if (IS_ERR(priv->tmon_base))
>>> +               return PTR_ERR(priv->tmon_base);
>>> +
>>> +       priv->dev = &pdev->dev;
>>> +       platform_set_drvdata(pdev, priv);
>>> +
>>> +       thermal = thermal_zone_of_sensor_register(&pdev->dev, 0, priv,
>>> &of_ops);
>>> +       if (IS_ERR(thermal)) {
>>> +               ret = PTR_ERR(thermal);
>>> +               dev_err(&pdev->dev, "could not register sensor: %d\n",
>>> ret);
>>> +               return ret;
>>> +       }
>>> +
>>> +       priv->thermal = thermal;
>>> +
>>> +       irq = platform_get_irq(pdev, 0);
>>> +       if (irq < 0) {
>>> +               dev_err(&pdev->dev, "could not get IRQ\n");
>>> +               ret = irq;
>>> +               goto err;
>>> +       }
>>> +       ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
>>> +                                       brcmstb_tmon_irq_thread,
>>> IRQF_ONESHOT,
>>> +                                       DRV_NAME, priv);
>>> +       if (ret < 0) {
>>> +               dev_err(&pdev->dev, "could not request IRQ: %d\n", ret);
>>> +               goto err;
>>> +       }
>>> +
>>> +       dev_info(&pdev->dev, "registered AVS TMON of-sensor driver\n");
>>> +
>>> +       return 0;
>>> +
>>> +err:
>>> +       thermal_zone_of_sensor_unregister(&pdev->dev, thermal);
>>> +       return ret;
>>> +}
>>> +
>>> +static int brcmstb_thermal_exit(struct platform_device *pdev)
>>> +{
>>> +       struct brcmstb_thermal_priv *priv = platform_get_drvdata(pdev);
>>> +       struct thermal_zone_device *thermal = priv->thermal;
>>> +
>>> +       if (thermal)
>>> +               thermal_zone_of_sensor_unregister(&pdev->dev,
>>> priv->thermal);
>>> +
>>> +       return 0;
>>> +}
>>> +
>>> +static struct platform_driver brcmstb_thermal_driver = {
>>> +       .probe = brcmstb_thermal_probe,
>>> +       .remove = brcmstb_thermal_exit,
>>> +       .driver = {
>>> +               .name = DRV_NAME,
>>> +               .of_match_table = brcmstb_thermal_id_table,
>>> +       },
>>> +};
>>> +module_platform_driver(brcmstb_thermal_driver);
>>> +
>>> +MODULE_LICENSE("GPL v2");
>>> +MODULE_AUTHOR("Brian Norris");
>>> +MODULE_DESCRIPTION("Broadcom STB AVS TMON thermal driver");
>>