From patchwork Tue Mar 21 02:26:44 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hal Feng X-Patchwork-Id: 13182167 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 52F64C76195 for ; Tue, 21 Mar 2023 02:27:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=damJiCKNwJL4pqvPD7OV12xhGWHdfqgNyflIR5SCYpg=; b=uVMLACBCT9rqhB qEM8+cYaumGpTnk/QzODf/t7owEN10nRCmvD5dzUXNH2ft3ANlNOFs3tb6B9lFQktDditnK0GFH8K EqgQNh0P2J/gKXwsZZPAT73WmnptMW4eARbIyZsaOCdzcKCZhkDBjLtHQCAArjyUtFX9MaZKl55oJ dsg2Vy7oeJR17FZXVsMNz0UWUzYhkWKE9RfkmSl97/oZoZmvnO+4nZBYj93K07M7wGrGlnwrqJ7lU 1G12WHnSf5zPLWDW81pq6IvpyJ8KHfngnTgMyIlyAXMxMb4cwMYMJjYdQTC4aqXEQmT5zthJNd1Kf 9gUOqdLoV9lQAMurNNug==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1peRiZ-00B0fS-39; Tue, 21 Mar 2023 02:27:19 +0000 Received: from fd01.gateway.ufhost.com ([61.152.239.71]) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1peRiV-00B0ca-2u for linux-riscv@lists.infradead.org; Tue, 21 Mar 2023 02:27:18 +0000 Received: from EXMBX166.cuchost.com (unknown [175.102.18.54]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "EXMBX166", Issuer "EXMBX166" (not verified)) by fd01.gateway.ufhost.com (Postfix) with ESMTP id 6429324E0EA; Tue, 21 Mar 2023 10:26:51 +0800 (CST) Received: from EXMBX172.cuchost.com (172.16.6.92) by EXMBX166.cuchost.com (172.16.6.76) with Microsoft SMTP Server (TLS) id 15.0.1497.42; Tue, 21 Mar 2023 10:26:51 +0800 Received: from ubuntu.localdomain (183.27.97.64) by EXMBX172.cuchost.com (172.16.6.92) with Microsoft SMTP Server (TLS) id 15.0.1497.42; Tue, 21 Mar 2023 10:26:50 +0800 From: Hal Feng To: , , , CC: Jean Delvare , Guenter Roeck , Jonathan Corbet , Rob Herring , "Krzysztof Kozlowski" , Conor Dooley , Paul Walmsley , Palmer Dabbelt , Albert Ou , Emil Renner Berthing , Samin Guo , Hal Feng , Subject: [PATCH v6 2/2] hwmon: (sfctemp) Add StarFive JH71x0 temperature sensor Date: Tue, 21 Mar 2023 10:26:44 +0800 Message-ID: <20230321022644.107027-3-hal.feng@starfivetech.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20230321022644.107027-1-hal.feng@starfivetech.com> References: <20230321022644.107027-1-hal.feng@starfivetech.com> MIME-Version: 1.0 X-Originating-IP: [183.27.97.64] X-ClientProxiedBy: EXCAS064.cuchost.com (172.16.6.24) To EXMBX172.cuchost.com (172.16.6.92) X-YovoleRuleAgent: yovoleflag X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230320_192716_365157_11C8C867 X-CRM114-Status: GOOD ( 27.86 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org From: Emil Renner Berthing Add driver for the StarFive JH71x0 temperature sensor. You can enable/disable it and read temperature in milli Celcius through sysfs. Signed-off-by: Emil Renner Berthing Co-developed-by: Samin Guo Signed-off-by: Samin Guo Signed-off-by: Hal Feng --- Documentation/hwmon/index.rst | 1 + Documentation/hwmon/sfctemp.rst | 33 ++++ MAINTAINERS | 8 + drivers/hwmon/Kconfig | 10 + drivers/hwmon/Makefile | 1 + drivers/hwmon/sfctemp.c | 331 ++++++++++++++++++++++++++++++++ 6 files changed, 384 insertions(+) create mode 100644 Documentation/hwmon/sfctemp.rst create mode 100644 drivers/hwmon/sfctemp.c diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst index f1fe75f596a5..d72bb1df6431 100644 --- a/Documentation/hwmon/index.rst +++ b/Documentation/hwmon/index.rst @@ -184,6 +184,7 @@ Hardware Monitoring Kernel Drivers sch5627 sch5636 scpi-hwmon + sfctemp sht15 sht21 sht3x diff --git a/Documentation/hwmon/sfctemp.rst b/Documentation/hwmon/sfctemp.rst new file mode 100644 index 000000000000..9fbd5bb1f356 --- /dev/null +++ b/Documentation/hwmon/sfctemp.rst @@ -0,0 +1,33 @@ +.. SPDX-License-Identifier: GPL-2.0 + +Kernel driver sfctemp +===================== + +Supported chips: + - StarFive JH7100 + - StarFive JH7110 + +Authors: + - Emil Renner Berthing + +Description +----------- + +This driver adds support for reading the built-in temperature sensor on the +JH7100 and JH7110 RISC-V SoCs by StarFive Technology Co. Ltd. + +``sysfs`` interface +------------------- + +The temperature sensor can be enabled, disabled and queried via the standard +hwmon interface in sysfs under ``/sys/class/hwmon/hwmonX`` for some value of +``X``: + +================ ==== ============================================= +Name Perm Description +================ ==== ============================================= +temp1_enable RW Enable or disable temperature sensor. + Automatically enabled by the driver, + but may be disabled to save power. +temp1_input RO Temperature reading in milli-degrees Celsius. +================ ==== ============================================= diff --git a/MAINTAINERS b/MAINTAINERS index d8ebab595b2a..d958238a82f4 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -18911,6 +18911,14 @@ S: Supported F: Documentation/networking/devlink/sfc.rst F: drivers/net/ethernet/sfc/ +SFCTEMP HWMON DRIVER +M: Emil Renner Berthing +L: linux-hwmon@vger.kernel.org +S: Maintained +F: Documentation/devicetree/bindings/hwmon/starfive,jh71x0-temp.yaml +F: Documentation/hwmon/sfctemp.rst +F: drivers/hwmon/sfctemp.c + SFF/SFP/SFP+ MODULE SUPPORT M: Russell King L: netdev@vger.kernel.org diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 5b3b76477b0e..abb82a73dbaf 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -1929,6 +1929,16 @@ config SENSORS_STTS751 This driver can also be built as a module. If so, the module will be called stts751. +config SENSORS_SFCTEMP + tristate "Starfive JH71x0 temperature sensor" + depends on ARCH_STARFIVE || COMPILE_TEST + help + If you say yes here you get support for temperature sensor + on the Starfive JH71x0 SoCs. + + This driver can also be built as a module. If so, the module + will be called sfctemp. + config SENSORS_SMM665 tristate "Summit Microelectronics SMM665" depends on I2C diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index 88712b5031c8..386f4debe68b 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -181,6 +181,7 @@ obj-$(CONFIG_SENSORS_SBRMI) += sbrmi.o obj-$(CONFIG_SENSORS_SCH56XX_COMMON)+= sch56xx-common.o obj-$(CONFIG_SENSORS_SCH5627) += sch5627.o obj-$(CONFIG_SENSORS_SCH5636) += sch5636.o +obj-$(CONFIG_SENSORS_SFCTEMP) += sfctemp.o obj-$(CONFIG_SENSORS_SL28CPLD) += sl28cpld-hwmon.o obj-$(CONFIG_SENSORS_SHT15) += sht15.o obj-$(CONFIG_SENSORS_SHT21) += sht21.o diff --git a/drivers/hwmon/sfctemp.c b/drivers/hwmon/sfctemp.c new file mode 100644 index 000000000000..d7484e2b8100 --- /dev/null +++ b/drivers/hwmon/sfctemp.c @@ -0,0 +1,331 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2021 Emil Renner Berthing + * Copyright (C) 2021 Samin Guo + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * TempSensor reset. The RSTN can be de-asserted once the analog core has + * powered up. Trst(min 100ns) + * 0:reset 1:de-assert + */ +#define SFCTEMP_RSTN BIT(0) + +/* + * TempSensor analog core power down. The analog core will be powered up + * Tpu(min 50us) after PD is de-asserted. RSTN should be held low until the + * analog core is powered up. + * 0:power up 1:power down + */ +#define SFCTEMP_PD BIT(1) + +/* + * TempSensor start conversion enable. + * 0:disable 1:enable + */ +#define SFCTEMP_RUN BIT(2) + +/* + * TempSensor conversion value output. + * Temp(C)=DOUT*Y/4094 - K + */ +#define SFCTEMP_DOUT_POS 16 +#define SFCTEMP_DOUT_MSK GENMASK(27, 16) + +/* DOUT to Celcius conversion constants */ +#define SFCTEMP_Y1000 237500L +#define SFCTEMP_Z 4094L +#define SFCTEMP_K1000 81100L + +struct sfctemp { + /* serialize access to hardware register and enabled below */ + struct mutex lock; + void __iomem *regs; + struct clk *clk_sense; + struct clk *clk_bus; + struct reset_control *rst_sense; + struct reset_control *rst_bus; + bool enabled; +}; + +static void sfctemp_power_up(struct sfctemp *sfctemp) +{ + /* make sure we're powered down first */ + writel(SFCTEMP_PD, sfctemp->regs); + udelay(1); + + writel(0, sfctemp->regs); + /* wait t_pu(50us) + t_rst(100ns) */ + usleep_range(60, 200); + + /* de-assert reset */ + writel(SFCTEMP_RSTN, sfctemp->regs); + udelay(1); /* wait t_su(500ps) */ +} + +static void sfctemp_power_down(struct sfctemp *sfctemp) +{ + writel(SFCTEMP_PD, sfctemp->regs); +} + +static void sfctemp_run(struct sfctemp *sfctemp) +{ + writel(SFCTEMP_RSTN | SFCTEMP_RUN, sfctemp->regs); + udelay(1); +} + +static void sfctemp_stop(struct sfctemp *sfctemp) +{ + writel(SFCTEMP_RSTN, sfctemp->regs); +} + +static int sfctemp_enable(struct sfctemp *sfctemp) +{ + int ret = 0; + + mutex_lock(&sfctemp->lock); + if (sfctemp->enabled) + goto done; + + ret = clk_prepare_enable(sfctemp->clk_bus); + if (ret) + goto err; + ret = reset_control_deassert(sfctemp->rst_bus); + if (ret) + goto err_disable_bus; + + ret = clk_prepare_enable(sfctemp->clk_sense); + if (ret) + goto err_assert_bus; + ret = reset_control_deassert(sfctemp->rst_sense); + if (ret) + goto err_disable_sense; + + sfctemp_power_up(sfctemp); + sfctemp_run(sfctemp); + sfctemp->enabled = true; +done: + mutex_unlock(&sfctemp->lock); + return ret; + +err_disable_sense: + clk_disable_unprepare(sfctemp->clk_sense); +err_assert_bus: + reset_control_assert(sfctemp->rst_bus); +err_disable_bus: + clk_disable_unprepare(sfctemp->clk_bus); +err: + mutex_unlock(&sfctemp->lock); + return ret; +} + +static int sfctemp_disable(struct sfctemp *sfctemp) +{ + mutex_lock(&sfctemp->lock); + if (!sfctemp->enabled) + goto done; + + sfctemp_stop(sfctemp); + sfctemp_power_down(sfctemp); + reset_control_assert(sfctemp->rst_sense); + clk_disable_unprepare(sfctemp->clk_sense); + reset_control_assert(sfctemp->rst_bus); + clk_disable_unprepare(sfctemp->clk_bus); + sfctemp->enabled = false; +done: + mutex_unlock(&sfctemp->lock); + return 0; +} + +static void sfctemp_disable_action(void *data) +{ + sfctemp_disable(data); +} + +static int sfctemp_convert(struct sfctemp *sfctemp, long *val) +{ + int ret; + + mutex_lock(&sfctemp->lock); + if (!sfctemp->enabled) { + ret = -ENODATA; + goto out; + } + + /* calculate temperature in milli Celcius */ + *val = (long)((readl(sfctemp->regs) & SFCTEMP_DOUT_MSK) >> SFCTEMP_DOUT_POS) + * SFCTEMP_Y1000 / SFCTEMP_Z - SFCTEMP_K1000; + + ret = 0; +out: + mutex_unlock(&sfctemp->lock); + return ret; +} + +static umode_t sfctemp_is_visible(const void *data, enum hwmon_sensor_types type, + u32 attr, int channel) +{ + switch (type) { + case hwmon_temp: + switch (attr) { + case hwmon_temp_enable: + return 0644; + case hwmon_temp_input: + return 0444; + default: + return 0; + } + default: + return 0; + } +} + +static int sfctemp_read(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long *val) +{ + struct sfctemp *sfctemp = dev_get_drvdata(dev); + + switch (type) { + case hwmon_temp: + switch (attr) { + case hwmon_temp_enable: + *val = sfctemp->enabled; + return 0; + case hwmon_temp_input: + return sfctemp_convert(sfctemp, val); + default: + return -EINVAL; + } + default: + return -EINVAL; + } +} + +static int sfctemp_write(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long val) +{ + struct sfctemp *sfctemp = dev_get_drvdata(dev); + + switch (type) { + case hwmon_temp: + switch (attr) { + case hwmon_temp_enable: + if (val == 0) + return sfctemp_disable(sfctemp); + if (val == 1) + return sfctemp_enable(sfctemp); + return -EINVAL; + default: + return -EINVAL; + } + default: + return -EINVAL; + } +} + +static const struct hwmon_channel_info *sfctemp_info[] = { + HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ), + HWMON_CHANNEL_INFO(temp, HWMON_T_ENABLE | HWMON_T_INPUT), + NULL +}; + +static const struct hwmon_ops sfctemp_hwmon_ops = { + .is_visible = sfctemp_is_visible, + .read = sfctemp_read, + .write = sfctemp_write, +}; + +static const struct hwmon_chip_info sfctemp_chip_info = { + .ops = &sfctemp_hwmon_ops, + .info = sfctemp_info, +}; + +static int sfctemp_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device *hwmon_dev; + struct sfctemp *sfctemp; + int ret; + + sfctemp = devm_kzalloc(dev, sizeof(*sfctemp), GFP_KERNEL); + if (!sfctemp) + return -ENOMEM; + + dev_set_drvdata(dev, sfctemp); + mutex_init(&sfctemp->lock); + + sfctemp->regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(sfctemp->regs)) + return PTR_ERR(sfctemp->regs); + + sfctemp->clk_sense = devm_clk_get(dev, "sense"); + if (IS_ERR(sfctemp->clk_sense)) + return dev_err_probe(dev, PTR_ERR(sfctemp->clk_sense), + "error getting sense clock\n"); + + sfctemp->clk_bus = devm_clk_get(dev, "bus"); + if (IS_ERR(sfctemp->clk_bus)) + return dev_err_probe(dev, PTR_ERR(sfctemp->clk_bus), + "error getting bus clock\n"); + + sfctemp->rst_sense = devm_reset_control_get_exclusive(dev, "sense"); + if (IS_ERR(sfctemp->rst_sense)) + return dev_err_probe(dev, PTR_ERR(sfctemp->rst_sense), + "error getting sense reset\n"); + + sfctemp->rst_bus = devm_reset_control_get_exclusive(dev, "bus"); + if (IS_ERR(sfctemp->rst_bus)) + return dev_err_probe(dev, PTR_ERR(sfctemp->rst_bus), + "error getting busreset\n"); + + ret = reset_control_assert(sfctemp->rst_sense); + if (ret) + return dev_err_probe(dev, ret, "error asserting sense reset\n"); + + ret = reset_control_assert(sfctemp->rst_bus); + if (ret) + return dev_err_probe(dev, ret, "error asserting bus reset\n"); + + ret = devm_add_action(dev, sfctemp_disable_action, sfctemp); + if (ret) + return ret; + + ret = sfctemp_enable(sfctemp); + if (ret) + return dev_err_probe(dev, ret, "error enabling temperature sensor: %d\n", ret); + + hwmon_dev = devm_hwmon_device_register_with_info(dev, "sfctemp", sfctemp, + &sfctemp_chip_info, NULL); + return PTR_ERR_OR_ZERO(hwmon_dev); +} + +static const struct of_device_id sfctemp_of_match[] = { + { .compatible = "starfive,jh7100-temp" }, + { .compatible = "starfive,jh7110-temp" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, sfctemp_of_match); + +static struct platform_driver sfctemp_driver = { + .probe = sfctemp_probe, + .driver = { + .name = "sfctemp", + .of_match_table = sfctemp_of_match, + }, +}; +module_platform_driver(sfctemp_driver); + +MODULE_AUTHOR("Emil Renner Berthing"); +MODULE_DESCRIPTION("StarFive JH71x0 temperature sensor driver"); +MODULE_LICENSE("GPL");