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SubjectRe: [PATCH v4 2/6] thermal: amlogic: Add thermal driver to support G12 SoCs
On Thu, Aug 22, 2019 at 3:54 AM Guillaume La Roque
<glaroque@baylibre.com> wrote:
>
> Amlogic G12A and G12B SoCs integrate two thermal sensors
> with the same design.
> One is located close to the DDR controller and the other one is
> located close to the PLLs (between the CPU and GPU).

Merge into one paragraph?

> The calibration data for each of the thermal sensors instance is
> stored in a different location within the AO region.
>
> Implement reading the temperature from each thermal sensor.
>
> The IP block has more functionality, which may be added to this driver
> in the future:
> - chip reset when the temperature exceeds a configurable threshold
> - up to four interrupts when the temperature has risen above a
> configurable threshold
> - up to four interrupts when the temperature has fallen below a
> configurable threshold
>
> Signed-off-by: Guillaume La Roque <glaroque@baylibre.com>
> ---
> drivers/thermal/Kconfig | 11 +
> drivers/thermal/Makefile | 1 +
> drivers/thermal/amlogic_thermal.c | 335 ++++++++++++++++++++++++++++++
> 3 files changed, 347 insertions(+)
> create mode 100644 drivers/thermal/amlogic_thermal.c
>
> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> index 9966364a6deb..0f31bb4bc372 100644
> --- a/drivers/thermal/Kconfig
> +++ b/drivers/thermal/Kconfig
> @@ -348,6 +348,17 @@ config MTK_THERMAL
> Enable this option if you want to have support for thermal management
> controller present in Mediatek SoCs
>
> +config AMLOGIC_THERMAL
> + tristate "Amlogic Thermal Support"
> + default ARCH_MESON
> + depends on OF && ARCH_MESON
> + help
> + If you say yes here you get support for Amlogic Thermal
> + for G12 SoC Family.
> +
> + This driver can also be built as a module. If so, the module will
> + be called amlogic_thermal.
> +
> menu "Intel thermal drivers"
> depends on X86 || X86_INTEL_QUARK || COMPILE_TEST
> source "drivers/thermal/intel/Kconfig"
> diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
> index 74a37c7f847a..baeb70bf0568 100644
> --- a/drivers/thermal/Makefile
> +++ b/drivers/thermal/Makefile
> @@ -54,3 +54,4 @@ obj-$(CONFIG_MTK_THERMAL) += mtk_thermal.o
> obj-$(CONFIG_GENERIC_ADC_THERMAL) += thermal-generic-adc.o
> obj-$(CONFIG_ZX2967_THERMAL) += zx2967_thermal.o
> obj-$(CONFIG_UNIPHIER_THERMAL) += uniphier_thermal.o
> +obj-$(CONFIG_AMLOGIC_THERMAL) += amlogic_thermal.o
> diff --git a/drivers/thermal/amlogic_thermal.c b/drivers/thermal/amlogic_thermal.c
> new file mode 100644
> index 000000000000..173d808048d2
> --- /dev/null
> +++ b/drivers/thermal/amlogic_thermal.c
> @@ -0,0 +1,335 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Amlogic Thermal Sensor Driver
> + *
> + * Copyright (C) 2017 Huan Biao <huan.biao@amlogic.com>
> + * Copyright (C) 2019 Guillaume La Roque <glaroque@baylibre.com>
> + *
> + * Register value to celsius temperature formulas:
> + * Read_Val m * U
> + * U = ---------, Uptat = ---------
> + * 2^16 1 + n * U
> + *
> + * Temperature = A * ( Uptat + u_efuse / 2^16 )- B
> + *
> + * A B m n : calibration parameters
> + * u_efuse : fused calibration value, it's a signed 16 bits value
> + */
> +
> +#include <linux/bitfield.h>
> +#include <linux/clk.h>
> +#include <linux/io.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/thermal.h>
> +
> +#include "thermal_core.h"
> +
> +#define TSENSOR_CFG_REG1 0x4
> + #define TSENSOR_CFG_REG1_RSET_VBG BIT(12)
> + #define TSENSOR_CFG_REG1_RSET_ADC BIT(11)
> + #define TSENSOR_CFG_REG1_VCM_EN BIT(10)
> + #define TSENSOR_CFG_REG1_VBG_EN BIT(9)
> + #define TSENSOR_CFG_REG1_OUT_CTL BIT(6)
> + #define TSENSOR_CFG_REG1_FILTER_EN BIT(5)
> + #define TSENSOR_CFG_REG1_DEM_EN BIT(3)
> + #define TSENSOR_CFG_REG1_CH_SEL GENMASK(1, 0)
> + #define TSENSOR_CFG_REG1_ENABLE \
> + (TSENSOR_CFG_REG1_FILTER_EN | \
> + TSENSOR_CFG_REG1_VCM_EN | \
> + TSENSOR_CFG_REG1_VBG_EN | \
> + TSENSOR_CFG_REG1_DEM_EN | \
> + TSENSOR_CFG_REG1_CH_SEL)
> +
> +#define TSENSOR_STAT0 0x40
> +
> +#define TSENSOR_STAT9 0x64
> +
> +#define TSENSOR_READ_TEMP_MASK GENMASK(15, 0)
> +#define TSENSOR_TEMP_MASK GENMASK(11, 0)
> +
> +#define TSENSOR_TRIM_SIGN_MASK BIT(15)
> +#define TSENSOR_TRIM_TEMP_MASK GENMASK(14, 0)
> +#define TSENSOR_TRIM_VERSION_MASK GENMASK(31, 24)
> +
> +#define TSENSOR_TRIM_VERSION(_version) \
> + FIELD_GET(TSENSOR_TRIM_VERSION_MASK, _version)
> +
> +#define TSENSOR_TRIM_CALIB_VALID_MASK (GENMASK(3, 2) | BIT(7))
> +
> +#define TSENSOR_CALIB_OFFSET 1
> +#define TSENSOR_CALIB_SHIFT 4
> +
> +/**
> + * struct amlogic_thermal_soc_calib_data
> + * @A, B, m, n: calibration parameters
> + * This structure is required for configuration of amlogic thermal driver.
> + */
> +struct amlogic_thermal_soc_calib_data {
> + int A;
> + int B;
> + int m;
> + int n;
> +};
> +
> +/**
> + * struct amlogic_thermal_data
> + * @u_efuse_off: register offset to read fused calibration value
> + * @soc: calibration parameters structure pointer

This doesn't match the member below.

> + * @regmap_config: regmap config for the device
> + * This structure is required for configuration of amlogic thermal driver.
> + */
> +struct amlogic_thermal_data {
> + int u_efuse_off;
> + const struct amlogic_thermal_soc_calib_data *calibration_parameters;
> + const struct regmap_config *regmap_config;
> +};
> +
> +struct amlogic_thermal {
> + struct platform_device *pdev;
> + const struct amlogic_thermal_data *data;
> + struct regmap *regmap;
> + struct regmap *sec_ao_map;
> + struct clk *clk;
> + struct thermal_zone_device *tzd;
> + u32 trim_info;
> +};
> +
> +/*
> + * Calculate a temperature value from a temperature code.
> + * The unit of the temperature is degree milliCelsius.
> + */
> +static int amlogic_thermal_code_to_millicelsius(struct amlogic_thermal *pdata,
> + int temp_code)
> +{
> + const struct amlogic_thermal_soc_calib_data *param =
> + pdata->data->calibration_parameters;
> + int temp;
> + s64 factor, Uptat, uefuse;
> +
> + uefuse = pdata->trim_info & TSENSOR_TRIM_SIGN_MASK ?
> + ~(pdata->trim_info & TSENSOR_TRIM_TEMP_MASK) + 1 :
> + (pdata->trim_info & TSENSOR_TRIM_TEMP_MASK);
> +
> + factor = param->n * temp_code;
> + factor = div_s64(factor, 100);
> +
> + Uptat = temp_code * param->m;
> + Uptat = div_s64(Uptat, 100);
> + Uptat = Uptat * BIT(16);
> + Uptat = div_s64(Uptat, BIT(16) + factor);
> +
> + temp = (Uptat + uefuse) * param->A;
> + temp = div_s64(temp, BIT(16));
> + temp = (temp - param->B) * 100;
> +
> + return temp;
> +}
> +
> +static int amlogic_thermal_initialize(struct amlogic_thermal *pdata)
> +{
> + int ret = 0;
> + int ver;
> +
> + regmap_read(pdata->sec_ao_map, pdata->data->u_efuse_off,
> + &pdata->trim_info);
> +
> + ver = TSENSOR_TRIM_VERSION(pdata->trim_info);
> +
> + if ((ver & TSENSOR_TRIM_CALIB_VALID_MASK) == 0) {
> + ret = -EINVAL;
> + dev_err(&pdata->pdev->dev,
> + "tsensor thermal calibration not supported: 0x%x!\n",
> + ver);
> + }
> +
> + return ret;
> +}
> +
> +static int amlogic_thermal_enable(struct amlogic_thermal *data)
> +{
> + int ret;
> +
> + ret = clk_prepare_enable(data->clk);
> + if (ret)
> + return ret;
> +
> + regmap_update_bits(data->regmap, TSENSOR_CFG_REG1,
> + TSENSOR_CFG_REG1_ENABLE, TSENSOR_CFG_REG1_ENABLE);
> +
> + return 0;
> +}
> +
> +static int amlogic_thermal_disable(struct amlogic_thermal *data)
> +{
> + regmap_update_bits(data->regmap, TSENSOR_CFG_REG1,
> + TSENSOR_CFG_REG1_ENABLE, 0);
> + clk_disable_unprepare(data->clk);
> +
> + return 0;
> +}
> +
> +static int amlogic_thermal_get_temp(void *data, int *temp)
> +{
> + unsigned int tval;
> + struct amlogic_thermal *pdata = data;
> +
> + if (!data)
> + return -EINVAL;
> +
> + regmap_read(pdata->regmap, TSENSOR_STAT0, &tval);
> + *temp =
> + amlogic_thermal_code_to_millicelsius(pdata,
> + tval & TSENSOR_READ_TEMP_MASK);
> +
> + return 0;
> +}
> +
> +static const struct thermal_zone_of_device_ops amlogic_thermal_ops = {
> + .get_temp = amlogic_thermal_get_temp,
> +};
> +
> +static const struct regmap_config amlogic_thermal_regmap_config_g12a = {
> + .reg_bits = 8,
> + .val_bits = 32,
> + .reg_stride = 4,
> + .max_register = TSENSOR_STAT9,
> +};
> +
> +static const struct amlogic_thermal_soc_calib_data amlogic_thermal_g12a = {
> + .A = 9411,
> + .B = 3159,
> + .m = 424,
> + .n = 324,
> +};
> +
> +static const struct amlogic_thermal_data amlogic_thermal_g12a_cpu_param = {
> + .u_efuse_off = 0x128,
> + .calibration_parameters = &amlogic_thermal_g12a,
> + .regmap_config = &amlogic_thermal_regmap_config_g12a,
> +};
> +
> +static const struct amlogic_thermal_data amlogic_thermal_g12a_ddr_param = {
> + .u_efuse_off = 0xf0,
> + .calibration_parameters = &amlogic_thermal_g12a,
> + .regmap_config = &amlogic_thermal_regmap_config_g12a,
> +};
> +
> +static const struct of_device_id of_amlogic_thermal_match[] = {
> + {
> + .compatible = "amlogic,g12a-ddr-thermal",
> + .data = &amlogic_thermal_g12a_ddr_param,
> + },
> + {
> + .compatible = "amlogic,g12a-cpu-thermal",
> + .data = &amlogic_thermal_g12a_cpu_param,
> + },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, of_amlogic_thermal_match);
> +
> +static int amlogic_thermal_probe(struct platform_device *pdev)
> +{
> + struct amlogic_thermal *pdata;
> + struct device *dev = &pdev->dev;
> + struct resource *res;
> + void __iomem *base;
> + int ret;
> +
> + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
> + if (!pdata)
> + return -ENOMEM;
> +
> + pdata->data = of_device_get_match_data(dev);
> + pdata->pdev = pdev;
> + platform_set_drvdata(pdev, pdata);
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

Use devm_platform_ioremap_resource instead.

> + base = devm_ioremap_resource(dev, res);
> + if (IS_ERR(base)) {
> + dev_err(dev, "failed to get io address\n");
> + return PTR_ERR(base);
> + }
> +
> + pdata->regmap = devm_regmap_init_mmio(dev, base,
> + pdata->data->regmap_config);
> + if (IS_ERR(pdata->regmap))
> + return PTR_ERR(pdata->regmap);
> +
> + pdata->clk = devm_clk_get(dev, NULL);
> + if (IS_ERR(pdata->clk)) {
> + if (PTR_ERR(pdata->clk) != -EPROBE_DEFER)
> + dev_err(dev, "failed to get clock\n");
> + return PTR_ERR(pdata->clk);
> + }
> +
> + pdata->sec_ao_map = syscon_regmap_lookup_by_phandle
> + (pdev->dev.of_node, "amlogic,ao-secure");
> + if (IS_ERR(pdata->sec_ao_map)) {
> + dev_err(dev, "syscon regmap lookup failed.\n");
> + return PTR_ERR(pdata->sec_ao_map);
> + }
> +
> + pdata->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
> + 0,
> + pdata,
> + &amlogic_thermal_ops);
> + if (IS_ERR(pdata->tzd)) {
> + ret = PTR_ERR(pdata->tzd);
> + dev_err(dev, "Failed to register tsensor: %d\n", ret);
> + return PTR_ERR(pdata->tzd);

return ret;

> + }
> +
> + ret = amlogic_thermal_initialize(pdata);
> + if (ret)
> + return ret;
> +
> + ret = amlogic_thermal_enable(pdata);
> +
> + return ret;
> +}
> +
> +static int amlogic_thermal_remove(struct platform_device *pdev)
> +{
> + struct amlogic_thermal *data = platform_get_drvdata(pdev);
> +
> + return amlogic_thermal_disable(data);
> +}
> +
> +static int __maybe_unused amlogic_thermal_suspend(struct device *dev)
> +{
> + struct amlogic_thermal *data = dev_get_drvdata(dev);
> +
> + return amlogic_thermal_disable(data);
> +}
> +
> +static int __maybe_unused amlogic_thermal_resume(struct device *dev)
> +{
> + struct amlogic_thermal *data = dev_get_drvdata(dev);
> +
> + return amlogic_thermal_enable(data);
> +}
> +
> +static SIMPLE_DEV_PM_OPS(amlogic_thermal_pm_ops,
> + amlogic_thermal_suspend, amlogic_thermal_resume);
> +
> +static struct platform_driver amlogic_thermal_driver = {
> + .driver = {
> + .name = "amlogic_thermal",
> + .pm = &amlogic_thermal_pm_ops,
> + .of_match_table = of_amlogic_thermal_match,
> + },
> + .probe = amlogic_thermal_probe,
> + .remove = amlogic_thermal_remove,
> +};
> +
> +module_platform_driver(amlogic_thermal_driver);
> +
> +MODULE_AUTHOR("Guillaume La Roque <glaroque@baylibre.com>");
> +MODULE_DESCRIPTION("Amlogic thermal driver");
> +MODULE_LICENSE("GPL v2");
> --
> 2.17.1
>

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