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author | Jason M. Bills <jason.m.bills@linux.intel.com> | 2020-12-08 00:38:17 +0300 |
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committer | Jason M. Bills <jason.m.bills@linux.intel.com> | 2020-12-08 00:38:17 +0300 |
commit | 8d6ae7f2a817751fad151168fa10ce28ee0869d8 (patch) | |
tree | 281032f7ec07c41589aa094bd165cc2a98f2d3a7 /meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/0003-Add-basic-support-for-SB-TSI-sensors.patch | |
parent | c16fb8893b19075db4bcf3b5bf33c1db8c3ca2bd (diff) | |
parent | 5da3c2284560a7e08ffafd03c5b5ba44a3242228 (diff) | |
download | openbmc-8d6ae7f2a817751fad151168fa10ce28ee0869d8.tar.xz |
Merge tag '0.26' of ssh://git-amr-1.devtools.intel.com:29418/openbmc-openbmc into update
Diffstat (limited to 'meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/0003-Add-basic-support-for-SB-TSI-sensors.patch')
-rw-r--r-- | meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/0003-Add-basic-support-for-SB-TSI-sensors.patch | 327 |
1 files changed, 327 insertions, 0 deletions
diff --git a/meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/0003-Add-basic-support-for-SB-TSI-sensors.patch b/meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/0003-Add-basic-support-for-SB-TSI-sensors.patch new file mode 100644 index 000000000..b690a9813 --- /dev/null +++ b/meta-quanta/meta-gbs/recipes-kernel/linux/linux-nuvoton/0003-Add-basic-support-for-SB-TSI-sensors.patch @@ -0,0 +1,327 @@ +SB Temperature Sensor Interface (SB-TSI) is an SMBus compatible +interface that reports AMD SoC's Ttcl (normalized temperature), +and resembles a typical 8-pin remote temperature sensor's I2C interface +to BMC. + +This commit adds basic support using this interface to read CPU +temperature, and read/write high/low CPU temp thresholds. + +To instantiate this driver on an AMD CPU with SB-TSI +support, the i2c bus number would be the bus connected from the board +management controller (BMC) to the CPU. The i2c address is specified in +Section 6.3.1 of the spec [1]: The SB-TSI address is normally 98h for socket 0 +and 90h for socket 1, but it could vary based on hardware address select pins. + +[1]: https://www.amd.com/system/files/TechDocs/56255_OSRR.pdf + +Test status: tested reading temp1_input, and reading/writing +temp1_max/min. + +Signed-off-by: Kun Yi <kunyi at google.com> +--- + drivers/hwmon/Kconfig | 10 ++ + drivers/hwmon/Makefile | 1 + + drivers/hwmon/sbtsi_temp.c | 259 +++++++++++++++++++++++++++++++++++++ + 3 files changed, 270 insertions(+) + create mode 100644 drivers/hwmon/sbtsi_temp.c + +diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig +index 05a30832c6ba..9585dcd01d1b 100644 +--- a/drivers/hwmon/Kconfig ++++ b/drivers/hwmon/Kconfig +@@ -1412,6 +1412,16 @@ config SENSORS_RASPBERRYPI_HWMON + This driver can also be built as a module. If so, the module + will be called raspberrypi-hwmon. + ++config SENSORS_SBTSI ++ tristate "Emulated SB-TSI temperature sensor" ++ depends on I2C ++ help ++ If you say yes here you get support for emulated temperature ++ sensors on AMD SoCs with SB-TSI interface connected to a BMC device. ++ ++ This driver can also be built as a module. If so, the module will ++ be called sbtsi_temp. ++ + config SENSORS_SHT15 + tristate "Sensiron humidity and temperature sensors. SHT15 and compat." + depends on GPIOLIB || COMPILE_TEST +diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile +index b0b9c8e57176..cd109f003ce4 100644 +--- a/drivers/hwmon/Makefile ++++ b/drivers/hwmon/Makefile +@@ -152,6 +152,7 @@ obj-$(CONFIG_SENSORS_POWR1220) += powr1220.o + obj-$(CONFIG_SENSORS_PWM_FAN) += pwm-fan.o + obj-$(CONFIG_SENSORS_RASPBERRYPI_HWMON) += raspberrypi-hwmon.o + obj-$(CONFIG_SENSORS_S3C) += s3c-hwmon.o ++obj-$(CONFIG_SENSORS_SBTSI) += sbtsi_temp.o + obj-$(CONFIG_SENSORS_SCH56XX_COMMON)+= sch56xx-common.o + obj-$(CONFIG_SENSORS_SCH5627) += sch5627.o + obj-$(CONFIG_SENSORS_SCH5636) += sch5636.o +diff --git a/drivers/hwmon/sbtsi_temp.c b/drivers/hwmon/sbtsi_temp.c +new file mode 100644 +index 000000000000..e3ad6a9f7ec1 +--- /dev/null ++++ b/drivers/hwmon/sbtsi_temp.c +@@ -0,0 +1,259 @@ ++// SPDX-License-Identifier: GPL-2.0-or-later ++/* ++ * sbtsi_temp.c - hwmon driver for a SBI Temperature Sensor Interface (SB-TSI) ++ * compliant AMD SoC temperature device. ++ * ++ * Copyright (c) 2020, Google Inc. ++ * Copyright (c) 2020, Kun Yi <kunyi at google.com> ++ */ ++ ++#include <linux/err.h> ++#include <linux/i2c.h> ++#include <linux/init.h> ++#include <linux/hwmon.h> ++#include <linux/module.h> ++#include <linux/mutex.h> ++#include <linux/of_device.h> ++#include <linux/of.h> ++ ++/* ++ * SB-TSI registers only support SMBus byte data access. "_INT" registers are ++ * the integer part of a temperature value or limit, and "_DEC" registers are ++ * corresponding decimal parts. ++ */ ++#define SBTSI_REG_TEMP_INT 0x01 /* RO */ ++#define SBTSI_REG_STATUS 0x02 /* RO */ ++#define SBTSI_REG_CONFIG 0x03 /* RO */ ++#define SBTSI_REG_TEMP_HIGH_INT 0x07 /* RW */ ++#define SBTSI_REG_TEMP_LOW_INT 0x08 /* RW */ ++#define SBTSI_REG_TEMP_DEC 0x10 /* RW */ ++#define SBTSI_REG_TEMP_HIGH_DEC 0x13 /* RW */ ++#define SBTSI_REG_TEMP_LOW_DEC 0x14 /* RW */ ++#define SBTSI_REG_REV 0xFF /* RO */ ++ ++#define SBTSI_CONFIG_READ_ORDER_SHIFT 5 ++ ++#define SBTSI_TEMP_MIN 0 ++#define SBTSI_TEMP_MAX 255875 ++#define SBTSI_REV_MAX_VALID_ID 4 ++ ++/* Each client has this additional data */ ++struct sbtsi_data { ++ struct i2c_client *client; ++ struct mutex lock; ++}; ++ ++/* ++ * From SB-TSI spec: CPU temperature readings and limit registers encode the ++ * temperature in increments of 0.125 from 0 to 255.875. The "high byte" ++ * register encodes the base-2 of the integer portion, and the upper 3 bits of ++ * the "low byte" encode in base-2 the decimal portion. ++ * ++ * e.g. INT=0x19, DEC=0x20 represents 25.125 degrees Celsius ++ * ++ * Therefore temperature in millidegree Celsius = ++ * (INT + DEC / 256) * 1000 = (INT * 8 + DEC / 32) * 125 ++ */ ++static inline int sbtsi_reg_to_mc(s32 integer, s32 decimal) ++{ ++ return ((integer << 3) + (decimal >> 5)) * 125; ++} ++ ++/* ++ * Inversely, given temperature in millidegree Celsius ++ * INT = (TEMP / 125) / 8 ++ * DEC = ((TEMP / 125) % 8) * 32 ++ * Caller have to make sure temp doesn't exceed 255875, the max valid value. ++ */ ++static inline void sbtsi_mc_to_reg(s32 temp, u8 *integer, u8 *decimal) ++{ ++ temp /= 125; ++ *integer = temp >> 3; ++ *decimal = (temp & 0x7) << 5; ++} ++ ++static int sbtsi_read(struct device *dev, enum hwmon_sensor_types type, ++ u32 attr, int channel, long *val) ++{ ++ struct sbtsi_data *data = dev_get_drvdata(dev); ++ s32 temp_int, temp_dec; ++ int err, reg_int, reg_dec; ++ u8 read_order; ++ ++ if (type != hwmon_temp) ++ return -EINVAL; ++ ++ read_order = 0; ++ switch (attr) { ++ case hwmon_temp_input: ++ /* ++ * ReadOrder bit specifies the reading order of integer and ++ * decimal part of CPU temp for atomic reads. If bit == 0, ++ * reading integer part triggers latching of the decimal part, ++ * so integer part should be read first. If bit == 1, read ++ * order should be reversed. ++ */ ++ err = i2c_smbus_read_byte_data(data->client, SBTSI_REG_CONFIG); ++ if (err < 0) ++ return err; ++ ++ read_order = (u8)err & BIT(SBTSI_CONFIG_READ_ORDER_SHIFT); ++ reg_int = SBTSI_REG_TEMP_INT; ++ reg_dec = SBTSI_REG_TEMP_DEC; ++ break; ++ case hwmon_temp_max: ++ reg_int = SBTSI_REG_TEMP_HIGH_INT; ++ reg_dec = SBTSI_REG_TEMP_HIGH_DEC; ++ break; ++ case hwmon_temp_min: ++ reg_int = SBTSI_REG_TEMP_LOW_INT; ++ reg_dec = SBTSI_REG_TEMP_LOW_DEC; ++ break; ++ default: ++ return -EINVAL; ++ } ++ ++ if (read_order == 0) { ++ temp_int = i2c_smbus_read_byte_data(data->client, reg_int); ++ temp_dec = i2c_smbus_read_byte_data(data->client, reg_dec); ++ } else { ++ temp_dec = i2c_smbus_read_byte_data(data->client, reg_dec); ++ temp_int = i2c_smbus_read_byte_data(data->client, reg_int); ++ } ++ ++ if (temp_int < 0) ++ return temp_int; ++ if (temp_dec < 0) ++ return temp_dec; ++ ++ *val = sbtsi_reg_to_mc(temp_int, temp_dec); ++ ++ return 0; ++} ++ ++static int sbtsi_write(struct device *dev, enum hwmon_sensor_types type, ++ u32 attr, int channel, long val) ++{ ++ struct sbtsi_data *data = dev_get_drvdata(dev); ++ int reg_int, reg_dec, err; ++ u8 temp_int, temp_dec; ++ ++ if (type != hwmon_temp) ++ return -EINVAL; ++ ++ switch (attr) { ++ case hwmon_temp_max: ++ reg_int = SBTSI_REG_TEMP_HIGH_INT; ++ reg_dec = SBTSI_REG_TEMP_HIGH_DEC; ++ break; ++ case hwmon_temp_min: ++ reg_int = SBTSI_REG_TEMP_LOW_INT; ++ reg_dec = SBTSI_REG_TEMP_LOW_DEC; ++ break; ++ default: ++ return -EINVAL; ++ } ++ ++ val = clamp_val(val, SBTSI_TEMP_MIN, SBTSI_TEMP_MAX); ++ mutex_lock(&data->lock); ++ sbtsi_mc_to_reg(val, &temp_int, &temp_dec); ++ err = i2c_smbus_write_byte_data(data->client, reg_int, temp_int); ++ if (err) ++ goto exit; ++ ++ err = i2c_smbus_write_byte_data(data->client, reg_dec, temp_dec); ++exit: ++ mutex_unlock(&data->lock); ++ return err; ++} ++ ++static umode_t sbtsi_is_visible(const void *data, ++ enum hwmon_sensor_types type, ++ u32 attr, int channel) ++{ ++ switch (type) { ++ case hwmon_temp: ++ switch (attr) { ++ case hwmon_temp_input: ++ return 0444; ++ case hwmon_temp_min: ++ return 0644; ++ case hwmon_temp_max: ++ return 0644; ++ } ++ break; ++ default: ++ break; ++ } ++ return 0; ++} ++ ++static const struct hwmon_channel_info *sbtsi_info[] = { ++ HWMON_CHANNEL_INFO(chip, ++ HWMON_C_REGISTER_TZ), ++ HWMON_CHANNEL_INFO(temp, ++ HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX), ++ NULL ++}; ++ ++static const struct hwmon_ops sbtsi_hwmon_ops = { ++ .is_visible = sbtsi_is_visible, ++ .read = sbtsi_read, ++ .write = sbtsi_write, ++}; ++ ++static const struct hwmon_chip_info sbtsi_chip_info = { ++ .ops = &sbtsi_hwmon_ops, ++ .info = sbtsi_info, ++}; ++ ++static int sbtsi_probe(struct i2c_client *client, ++ const struct i2c_device_id *id) ++{ ++ struct device *dev = &client->dev; ++ struct device *hwmon_dev; ++ struct sbtsi_data *data; ++ ++ data = devm_kzalloc(dev, sizeof(struct sbtsi_data), GFP_KERNEL); ++ if (!data) ++ return -ENOMEM; ++ ++ data->client = client; ++ mutex_init(&data->lock); ++ ++ hwmon_dev = ++ devm_hwmon_device_register_with_info(dev, client->name, data, ++ &sbtsi_chip_info, NULL); ++ ++ return PTR_ERR_OR_ZERO(hwmon_dev); ++} ++ ++static const struct i2c_device_id sbtsi_id[] = { ++ {"sbtsi", 0}, ++ {} ++}; ++MODULE_DEVICE_TABLE(i2c, sbtsi_id); ++ ++static const struct of_device_id __maybe_unused sbtsi_of_match[] = { ++ { ++ .compatible = "amd,sbtsi", ++ }, ++ { }, ++}; ++MODULE_DEVICE_TABLE(of, sbtsi_of_match); ++ ++static struct i2c_driver sbtsi_driver = { ++ .class = I2C_CLASS_HWMON, ++ .driver = { ++ .name = "sbtsi", ++ .of_match_table = of_match_ptr(sbtsi_of_match), ++ }, ++ .probe = sbtsi_probe, ++ .id_table = sbtsi_id, ++}; ++ ++module_i2c_driver(sbtsi_driver); ++ ++MODULE_AUTHOR("Kun Yi <kunyi at google.com>"); ++MODULE_DESCRIPTION("Hwmon driver for AMD SB-TSI emulated sensor"); ++MODULE_LICENSE("GPL"); +-- +2.26.0.292.g33ef6b2f38-goog
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