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hwmon: (sfctemp) Add StarFive JH71x0 temperature sensor
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 <kernel@esmil.dk> Co-developed-by: Samin Guo <samin.guo@starfivetech.com> Signed-off-by: Samin Guo <samin.guo@starfivetech.com> Signed-off-by: Hal Feng <hal.feng@starfivetech.com> Link: https://lore.kernel.org/r/20230321022644.107027-3-hal.feng@starfivetech.com Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Emil Renner Berthing
Guenter Roeck
parent
d16718fcdd
commit
7f2958e845
@ -184,6 +184,7 @@ Hardware Monitoring Kernel Drivers
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sch5627
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sch5636
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scpi-hwmon
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sfctemp
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sht15
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sht21
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sht3x
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33
Documentation/hwmon/sfctemp.rst
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33
Documentation/hwmon/sfctemp.rst
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@ -0,0 +1,33 @@
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.. SPDX-License-Identifier: GPL-2.0
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Kernel driver sfctemp
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=====================
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Supported chips:
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- StarFive JH7100
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- StarFive JH7110
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Authors:
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- Emil Renner Berthing <kernel@esmil.dk>
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Description
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-----------
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This driver adds support for reading the built-in temperature sensor on the
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JH7100 and JH7110 RISC-V SoCs by StarFive Technology Co. Ltd.
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``sysfs`` interface
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-------------------
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The temperature sensor can be enabled, disabled and queried via the standard
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hwmon interface in sysfs under ``/sys/class/hwmon/hwmonX`` for some value of
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``X``:
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================ ==== =============================================
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Name Perm Description
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================ ==== =============================================
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temp1_enable RW Enable or disable temperature sensor.
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Automatically enabled by the driver,
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but may be disabled to save power.
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temp1_input RO Temperature reading in milli-degrees Celsius.
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================ ==== =============================================
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@ -18908,6 +18908,14 @@ S: Supported
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F: Documentation/networking/devlink/sfc.rst
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F: drivers/net/ethernet/sfc/
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SFCTEMP HWMON DRIVER
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M: Emil Renner Berthing <kernel@esmil.dk>
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L: linux-hwmon@vger.kernel.org
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S: Maintained
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F: Documentation/devicetree/bindings/hwmon/starfive,jh71x0-temp.yaml
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F: Documentation/hwmon/sfctemp.rst
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F: drivers/hwmon/sfctemp.c
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SFF/SFP/SFP+ MODULE SUPPORT
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M: Russell King <linux@armlinux.org.uk>
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L: netdev@vger.kernel.org
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@ -1929,6 +1929,16 @@ config SENSORS_STTS751
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This driver can also be built as a module. If so, the module
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will be called stts751.
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config SENSORS_SFCTEMP
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tristate "Starfive JH71x0 temperature sensor"
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depends on ARCH_STARFIVE || COMPILE_TEST
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help
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If you say yes here you get support for temperature sensor
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on the Starfive JH71x0 SoCs.
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This driver can also be built as a module. If so, the module
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will be called sfctemp.
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config SENSORS_SMM665
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tristate "Summit Microelectronics SMM665"
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depends on I2C
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@ -181,6 +181,7 @@ obj-$(CONFIG_SENSORS_SBRMI) += sbrmi.o
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obj-$(CONFIG_SENSORS_SCH56XX_COMMON)+= sch56xx-common.o
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obj-$(CONFIG_SENSORS_SCH5627) += sch5627.o
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obj-$(CONFIG_SENSORS_SCH5636) += sch5636.o
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obj-$(CONFIG_SENSORS_SFCTEMP) += sfctemp.o
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obj-$(CONFIG_SENSORS_SL28CPLD) += sl28cpld-hwmon.o
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obj-$(CONFIG_SENSORS_SHT15) += sht15.o
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obj-$(CONFIG_SENSORS_SHT21) += sht21.o
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331
drivers/hwmon/sfctemp.c
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331
drivers/hwmon/sfctemp.c
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@ -0,0 +1,331 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2021 Emil Renner Berthing <kernel@esmil.dk>
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* Copyright (C) 2021 Samin Guo <samin.guo@starfivetech.com>
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*/
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#include <linux/bits.h>
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/hwmon.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/reset.h>
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/*
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* TempSensor reset. The RSTN can be de-asserted once the analog core has
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* powered up. Trst(min 100ns)
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* 0:reset 1:de-assert
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*/
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#define SFCTEMP_RSTN BIT(0)
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/*
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* TempSensor analog core power down. The analog core will be powered up
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* Tpu(min 50us) after PD is de-asserted. RSTN should be held low until the
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* analog core is powered up.
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* 0:power up 1:power down
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*/
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#define SFCTEMP_PD BIT(1)
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/*
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* TempSensor start conversion enable.
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* 0:disable 1:enable
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*/
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#define SFCTEMP_RUN BIT(2)
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/*
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* TempSensor conversion value output.
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* Temp(C)=DOUT*Y/4094 - K
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*/
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#define SFCTEMP_DOUT_POS 16
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#define SFCTEMP_DOUT_MSK GENMASK(27, 16)
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/* DOUT to Celcius conversion constants */
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#define SFCTEMP_Y1000 237500L
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#define SFCTEMP_Z 4094L
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#define SFCTEMP_K1000 81100L
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struct sfctemp {
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/* serialize access to hardware register and enabled below */
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struct mutex lock;
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void __iomem *regs;
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struct clk *clk_sense;
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struct clk *clk_bus;
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struct reset_control *rst_sense;
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struct reset_control *rst_bus;
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bool enabled;
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};
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static void sfctemp_power_up(struct sfctemp *sfctemp)
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{
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/* make sure we're powered down first */
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writel(SFCTEMP_PD, sfctemp->regs);
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udelay(1);
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writel(0, sfctemp->regs);
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/* wait t_pu(50us) + t_rst(100ns) */
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usleep_range(60, 200);
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/* de-assert reset */
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writel(SFCTEMP_RSTN, sfctemp->regs);
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udelay(1); /* wait t_su(500ps) */
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}
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static void sfctemp_power_down(struct sfctemp *sfctemp)
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{
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writel(SFCTEMP_PD, sfctemp->regs);
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}
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static void sfctemp_run(struct sfctemp *sfctemp)
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{
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writel(SFCTEMP_RSTN | SFCTEMP_RUN, sfctemp->regs);
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udelay(1);
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}
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static void sfctemp_stop(struct sfctemp *sfctemp)
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{
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writel(SFCTEMP_RSTN, sfctemp->regs);
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}
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static int sfctemp_enable(struct sfctemp *sfctemp)
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{
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int ret = 0;
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mutex_lock(&sfctemp->lock);
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if (sfctemp->enabled)
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goto done;
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ret = clk_prepare_enable(sfctemp->clk_bus);
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if (ret)
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goto err;
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ret = reset_control_deassert(sfctemp->rst_bus);
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if (ret)
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goto err_disable_bus;
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ret = clk_prepare_enable(sfctemp->clk_sense);
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if (ret)
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goto err_assert_bus;
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ret = reset_control_deassert(sfctemp->rst_sense);
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if (ret)
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goto err_disable_sense;
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sfctemp_power_up(sfctemp);
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sfctemp_run(sfctemp);
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sfctemp->enabled = true;
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done:
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mutex_unlock(&sfctemp->lock);
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return ret;
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err_disable_sense:
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clk_disable_unprepare(sfctemp->clk_sense);
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err_assert_bus:
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reset_control_assert(sfctemp->rst_bus);
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err_disable_bus:
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clk_disable_unprepare(sfctemp->clk_bus);
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err:
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mutex_unlock(&sfctemp->lock);
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return ret;
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}
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static int sfctemp_disable(struct sfctemp *sfctemp)
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{
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mutex_lock(&sfctemp->lock);
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if (!sfctemp->enabled)
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goto done;
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sfctemp_stop(sfctemp);
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sfctemp_power_down(sfctemp);
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reset_control_assert(sfctemp->rst_sense);
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clk_disable_unprepare(sfctemp->clk_sense);
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reset_control_assert(sfctemp->rst_bus);
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clk_disable_unprepare(sfctemp->clk_bus);
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sfctemp->enabled = false;
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done:
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mutex_unlock(&sfctemp->lock);
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return 0;
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}
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static void sfctemp_disable_action(void *data)
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{
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sfctemp_disable(data);
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}
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static int sfctemp_convert(struct sfctemp *sfctemp, long *val)
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{
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int ret;
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mutex_lock(&sfctemp->lock);
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if (!sfctemp->enabled) {
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ret = -ENODATA;
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goto out;
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}
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/* calculate temperature in milli Celcius */
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*val = (long)((readl(sfctemp->regs) & SFCTEMP_DOUT_MSK) >> SFCTEMP_DOUT_POS)
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* SFCTEMP_Y1000 / SFCTEMP_Z - SFCTEMP_K1000;
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ret = 0;
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out:
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mutex_unlock(&sfctemp->lock);
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return ret;
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}
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static umode_t sfctemp_is_visible(const void *data, enum hwmon_sensor_types type,
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u32 attr, int channel)
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{
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switch (type) {
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case hwmon_temp:
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switch (attr) {
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case hwmon_temp_enable:
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return 0644;
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case hwmon_temp_input:
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return 0444;
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default:
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return 0;
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}
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default:
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return 0;
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}
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}
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static int sfctemp_read(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, long *val)
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{
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struct sfctemp *sfctemp = dev_get_drvdata(dev);
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switch (type) {
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case hwmon_temp:
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switch (attr) {
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case hwmon_temp_enable:
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*val = sfctemp->enabled;
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return 0;
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case hwmon_temp_input:
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return sfctemp_convert(sfctemp, val);
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default:
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return -EINVAL;
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}
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default:
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return -EINVAL;
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}
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}
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static int sfctemp_write(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, long val)
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{
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struct sfctemp *sfctemp = dev_get_drvdata(dev);
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switch (type) {
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case hwmon_temp:
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switch (attr) {
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case hwmon_temp_enable:
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if (val == 0)
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return sfctemp_disable(sfctemp);
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if (val == 1)
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return sfctemp_enable(sfctemp);
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return -EINVAL;
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default:
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return -EINVAL;
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}
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default:
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return -EINVAL;
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}
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}
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static const struct hwmon_channel_info *sfctemp_info[] = {
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HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
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HWMON_CHANNEL_INFO(temp, HWMON_T_ENABLE | HWMON_T_INPUT),
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NULL
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};
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static const struct hwmon_ops sfctemp_hwmon_ops = {
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.is_visible = sfctemp_is_visible,
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.read = sfctemp_read,
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.write = sfctemp_write,
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};
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static const struct hwmon_chip_info sfctemp_chip_info = {
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.ops = &sfctemp_hwmon_ops,
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.info = sfctemp_info,
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};
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static int sfctemp_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device *hwmon_dev;
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struct sfctemp *sfctemp;
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int ret;
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sfctemp = devm_kzalloc(dev, sizeof(*sfctemp), GFP_KERNEL);
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if (!sfctemp)
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return -ENOMEM;
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dev_set_drvdata(dev, sfctemp);
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mutex_init(&sfctemp->lock);
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sfctemp->regs = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(sfctemp->regs))
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return PTR_ERR(sfctemp->regs);
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sfctemp->clk_sense = devm_clk_get(dev, "sense");
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if (IS_ERR(sfctemp->clk_sense))
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return dev_err_probe(dev, PTR_ERR(sfctemp->clk_sense),
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"error getting sense clock\n");
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sfctemp->clk_bus = devm_clk_get(dev, "bus");
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if (IS_ERR(sfctemp->clk_bus))
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return dev_err_probe(dev, PTR_ERR(sfctemp->clk_bus),
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"error getting bus clock\n");
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sfctemp->rst_sense = devm_reset_control_get_exclusive(dev, "sense");
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if (IS_ERR(sfctemp->rst_sense))
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return dev_err_probe(dev, PTR_ERR(sfctemp->rst_sense),
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"error getting sense reset\n");
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sfctemp->rst_bus = devm_reset_control_get_exclusive(dev, "bus");
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if (IS_ERR(sfctemp->rst_bus))
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return dev_err_probe(dev, PTR_ERR(sfctemp->rst_bus),
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"error getting busreset\n");
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ret = reset_control_assert(sfctemp->rst_sense);
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if (ret)
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return dev_err_probe(dev, ret, "error asserting sense reset\n");
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ret = reset_control_assert(sfctemp->rst_bus);
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if (ret)
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return dev_err_probe(dev, ret, "error asserting bus reset\n");
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ret = devm_add_action(dev, sfctemp_disable_action, sfctemp);
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if (ret)
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return ret;
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ret = sfctemp_enable(sfctemp);
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if (ret)
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return dev_err_probe(dev, ret, "error enabling temperature sensor: %d\n", ret);
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hwmon_dev = devm_hwmon_device_register_with_info(dev, "sfctemp", sfctemp,
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&sfctemp_chip_info, NULL);
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return PTR_ERR_OR_ZERO(hwmon_dev);
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}
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static const struct of_device_id sfctemp_of_match[] = {
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{ .compatible = "starfive,jh7100-temp" },
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{ .compatible = "starfive,jh7110-temp" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, sfctemp_of_match);
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static struct platform_driver sfctemp_driver = {
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.probe = sfctemp_probe,
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.driver = {
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.name = "sfctemp",
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.of_match_table = sfctemp_of_match,
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},
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};
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module_platform_driver(sfctemp_driver);
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MODULE_AUTHOR("Emil Renner Berthing");
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MODULE_DESCRIPTION("StarFive JH71x0 temperature sensor driver");
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MODULE_LICENSE("GPL");
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