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[23.128.96.18]) by mx.google.com with ESMTP id r24si7681165edc.286.2020.12.12.19.56.03; Sat, 12 Dec 2020 19:56:26 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20161025 header.b=FDe1RoXm; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404848AbgLKV6v (ORCPT + 99 others); Fri, 11 Dec 2020 16:58:51 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57346 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404842AbgLKV6N (ORCPT ); Fri, 11 Dec 2020 16:58:13 -0500 Received: from mail-qt1-x843.google.com (mail-qt1-x843.google.com [IPv6:2607:f8b0:4864:20::843]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 67E1EC061793 for ; Fri, 11 Dec 2020 13:57:32 -0800 (PST) Received: by mail-qt1-x843.google.com with SMTP id y15so7612891qtv.5 for ; Fri, 11 Dec 2020 13:57:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=7VN0c8q/KDW+v+os7gPmaHox88EUbEUHcVrZL7gfpdk=; b=FDe1RoXmvC5XdzrHdPQwIpaLv8tpQvO6DPdHDEEq8/dYX04ZUzidjvRisHUhUa0MGo oz5+Gv25YOZXI34yxhXZ3XZXMVeP/qcmbPNbJD5yPP6DO1xILfdKW6c6RAR7WISUO8NH z/dmXvK+MpsvaObEoCcFShAdfhawPLIOxV7ef/zvPJ7puU46xzKFVRxAh76LqtjAHlFA dRGCIf9qwyAdC6E8KBqE/89uMo4SdNzHs3Jl9nHAYbT3VOxXTRb5/ABM1JWsIEiCRuSZ GHD1V5jCR28weye4MgCCBocSOK1faK1PVvL7zSWLZjHCcoWPkebJ5eZhttg0pNEUzQJ8 cmaw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=7VN0c8q/KDW+v+os7gPmaHox88EUbEUHcVrZL7gfpdk=; b=e59/h4lvWFGrxilhtCAubfg9TIQl+3GCH7FmWnIP5l7A+sexoMQiDh14+bF8gGh4Wz an+ZdKjdQrB/gkkAi6B63BcLVgpSEqVzjgWw+SKOM7hPY0cfX9pJxAHn6ZI3+LVPugtQ /d/flXfILGMWZGhUZyBskquj2KQB8FR/k9OY/Ia70vTTpMc+5PXTQ480IVpIJBV8SdOj K/s2IT3ypk3GEBfWw5yhiOOpZJgzpphsrGrA1aU9DhGz5Yobl++FhUtB2levLqrbwBN4 1QRlzkVPiuG7LHm1LLltrPhsxR9h2gn/iB8nGluF75Wvr7ROVkoe69se+nhu5AA7jK2z ywZg== X-Gm-Message-State: AOAM5337LGpoGz4Z9wr0neSq/ZJu1omn1PXhPwpZI7rc2iUBxgU8vi5A ee/WVh/h5cPoo9maktpfjBuGnXUGEFPZcYJSzyhrYw== X-Received: by 2002:ac8:57c4:: with SMTP id w4mr18167596qta.163.1607723851165; Fri, 11 Dec 2020 13:57:31 -0800 (PST) MIME-Version: 1.0 References: <20201202165601.1532213-1-kunyi@google.com> <20201202165601.1532213-2-kunyi@google.com> <20201203013748.GA228752@roeck-us.net> In-Reply-To: <20201203013748.GA228752@roeck-us.net> From: Kun Yi Date: Fri, 11 Dec 2020 13:57:04 -0800 Message-ID: Subject: Re: [PATCH linux hwmon-next v4 1/3] hwmon: (sbtsi) Add basic support for SB-TSI sensors To: Guenter Roeck Cc: jdelvare@suse.com, robh+dt@kernel.org, mark.rutland@arm.com, "Venkatesh, Supreeth" , OpenBMC Maillist , linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Thanks Guenter for reviewing! On Wed, Dec 2, 2020 at 5:37 PM Guenter Roeck wrote: > > On Wed, Dec 02, 2020 at 08:55:59AM -0800, Kun Yi wrote: > > 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 > > --- > > drivers/hwmon/Kconfig | 10 ++ > > drivers/hwmon/Makefile | 1 + > > drivers/hwmon/sbtsi_temp.c | 265 +++++++++++++++++++++++++++++++++++++ > > 3 files changed, 276 insertions(+) > > create mode 100644 drivers/hwmon/sbtsi_temp.c > > > > diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig > > index 3c059fc23cd6..3d6a809700ae 100644 > > --- a/drivers/hwmon/Kconfig > > +++ b/drivers/hwmon/Kconfig > > @@ -1522,6 +1522,16 @@ config SENSORS_SL28CPLD > > This driver can also be built as a module. If so, the module > > will be called sl28cpld-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 01ca5d3fbad4..ee8c037919da 100644 > > --- a/drivers/hwmon/Makefile > > +++ b/drivers/hwmon/Makefile > > @@ -160,6 +160,7 @@ 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..6b0a7b9df1f3 > > --- /dev/null > > +++ b/drivers/hwmon/sbtsi_temp.c > > @@ -0,0 +1,265 @@ > > +// 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 > > + */ > > + > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > + > > +/* > > + * 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_CONFIG_READ_ORDER_SHIFT 5 > > + > > +#define SBTSI_TEMP_MIN 0 > > +#define SBTSI_TEMP_MAX 255875 > > + > > +/* 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; > > + bool reading_input; > > + > > + if (type != hwmon_temp) > > + return -EINVAL; > > Unnecessary check. Removed. > > > + > > + reading_input = false; > > + switch (attr) { > > + case hwmon_temp_input: > > + reading_input = true; > > + /* > > + * 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; > > + > > + mutex_lock(&data->lock); > > + if (err & BIT(SBTSI_CONFIG_READ_ORDER_SHIFT)) { > > + temp_dec = i2c_smbus_read_byte_data(data->client, > > + SBTSI_REG_TEMP_DEC); > > + temp_int = i2c_smbus_read_byte_data(data->client, > > + SBTSI_REG_TEMP_INT); > > + } else { > > + temp_int = i2c_smbus_read_byte_data(data->client, > > + SBTSI_REG_TEMP_INT); > > + temp_dec = i2c_smbus_read_byte_data(data->client, > > + SBTSI_REG_TEMP_DEC); > > + } > > + mutex_unlock(&data->lock); > > + 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 (!reading_input) { > > + temp_int = i2c_smbus_read_byte_data(data->client, reg_int); > > + temp_dec = i2c_smbus_read_byte_data(data->client, reg_dec); > > + } > > This adds unnecessary complexity. I would suggest to move the calls > to the case statements and drop reading_input as well as reg_int, > reg_dec. Done. > > Also, I just realized that the mutex is needed here as well, since > the values might be written while being read, which could result in > inconsistent read values. Example: Limit is changed from 100 to 99.75. > Since the integer value is written first, it is possible that 99.0 > is returned. That's a good catch. Modified. > > > + > > + 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; > > This check is really unnecessary. Removed. > > > + > > + 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, > > Line length limit is now 100 columns, so the above line split is unnecessary. Wow I didn't know.. Thanks! Adjusted a couple other lines based on the 100 cols. > > > + &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 "); > > +MODULE_DESCRIPTION("Hwmon driver for AMD SB-TSI emulated sensor"); > > +MODULE_LICENSE("GPL"); > > -- > > 2.29.2.454.gaff20da3a2-goog > > -- Regards, Kun