+++ /dev/null
-From 4cccec247776311b3d7274368e890704d2d95c9d Mon Sep 17 00:00:00 2001
-From: Emil Renner Berthing <kernel@esmil.dk>
-Date: Sun, 6 Jun 2021 22:31:18 +0200
-Subject: [PATCH 134/135] hwmon: (sfctemp) Add StarFive JH71x0 temperature
- sensor
-
-Register definitions and conversion constants based on sfctemp driver by
-Samin in the StarFive 5.10 kernel.
-
-Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
-Signed-off-by: Samin Guo <samin.guo@starfivetech.com>
----
- Documentation/hwmon/index.rst | 1 +
- Documentation/hwmon/sfctemp.rst | 33 +++
- MAINTAINERS | 8 +
- drivers/hwmon/Kconfig | 10 +
- drivers/hwmon/Makefile | 1 +
- drivers/hwmon/sfctemp.c | 350 ++++++++++++++++++++++++++++++++
- 6 files changed, 403 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 c1d11cf13eef..f7ede608b6e3 100644
---- a/Documentation/hwmon/index.rst
-+++ b/Documentation/hwmon/index.rst
-@@ -179,6 +179,7 @@ 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 <kernel@esmil.dk>
-+
-+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 99d8fe3a58f4..40aa981b3179 100644
---- a/MAINTAINERS
-+++ b/MAINTAINERS
-@@ -18663,6 +18663,14 @@ L: netdev@vger.kernel.org
- S: Supported
- F: drivers/net/ethernet/sfc/
-
-+SFCTEMP HWMON DRIVER
-+M: Emil Renner Berthing <kernel@esmil.dk>
-+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 <linux@armlinux.org.uk>
- L: netdev@vger.kernel.org
-diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
-index a5143d01b95f..ebae09c46639 100644
---- a/drivers/hwmon/Kconfig
-+++ b/drivers/hwmon/Kconfig
-@@ -1911,6 +1911,16 @@ 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 SOC_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 11d076cad8a2..5a4a02c5535c 100644
---- a/drivers/hwmon/Makefile
-+++ b/drivers/hwmon/Makefile
-@@ -179,6 +179,7 @@ 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..e56716ad9587
---- /dev/null
-+++ b/drivers/hwmon/sfctemp.c
-@@ -0,0 +1,350 @@
-+// SPDX-License-Identifier: GPL-2.0
-+/*
-+ * Copyright (C) 2021 Emil Renner Berthing <kernel@esmil.dk>
-+ * Copyright (C) 2021 Samin Guo <samin.guo@starfivetech.com>
-+ */
-+#include <linux/clk.h>
-+#include <linux/completion.h>
-+#include <linux/delay.h>
-+#include <linux/hwmon.h>
-+#include <linux/interrupt.h>
-+#include <linux/io.h>
-+#include <linux/module.h>
-+#include <linux/mutex.h>
-+#include <linux/of.h>
-+#include <linux/platform_device.h>
-+#include <linux/reset.h>
-+
-+/*
-+ * 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;
-+ struct completion conversion_done;
-+ void __iomem *regs;
-+ struct clk *clk_sense;
-+ struct clk *clk_bus;
-+ struct reset_control *rst_sense;
-+ struct reset_control *rst_bus;
-+ bool enabled;
-+};
-+
-+static irqreturn_t sfctemp_isr(int irq, void *data)
-+{
-+ struct sfctemp *sfctemp = data;
-+
-+ complete(&sfctemp->conversion_done);
-+ return IRQ_HANDLED;
-+}
-+
-+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_single(struct sfctemp *sfctemp)
-+{
-+ writel(SFCTEMP_RSTN | SFCTEMP_RUN, sfctemp->regs);
-+ udelay(1);
-+ 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->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_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;
-+ }
-+
-+ sfctemp_run_single(sfctemp);
-+
-+ ret = wait_for_completion_interruptible_timeout(&sfctemp->conversion_done,
-+ msecs_to_jiffies(10));
-+ if (ret <= 0) {
-+ if (ret == 0)
-+ ret = -ETIMEDOUT;
-+ 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;
-+ }
-+ 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);
-+ }
-+ 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);
-+ break;
-+ }
-+ 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);
-+ init_completion(&sfctemp->conversion_done);
-+
-+ 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 = platform_get_irq(pdev, 0);
-+ if (ret < 0)
-+ return ret;
-+
-+ ret = devm_request_irq(dev, ret, sfctemp_isr, 0, pdev->name, sfctemp);
-+ if (ret)
-+ return dev_err_probe(dev, ret, "error requesting irq\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, pdev->name, 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");
---
-2.20.1
-
projects / openwrt / staging / wigyori.git / blobdiff