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Subject[PATCH v1 2/2] hwmon: (sfctemp) Add StarFive JH7100 temperature sensor
Date
Register definitions based on sfctemp driver in the StarFive
5.10 kernel by Samin Guo <samin.guo@starfivetech.com>.

Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
---

@Samin: Only the register definitions and conversion constants are left
from your driver, but still it would be really nice if you could reply
to this mail with your Signed-off-by. Thanks!


drivers/hwmon/Kconfig | 9 ++
drivers/hwmon/Makefile | 1 +
drivers/hwmon/sfctemp.c | 309 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 319 insertions(+)
create mode 100644 drivers/hwmon/sfctemp.c

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 87624902ea80..fa7562920dfa 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1751,6 +1751,15 @@ 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 JH7100 temperature sensor"
+ help
+ If you say yes here you get support for temperature sensor
+ on the Starfive JH7100 SoC.
+
+ 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 59e78bc212cf..3723eb580bf3 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -167,6 +167,7 @@ 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
+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..62a838063e4e
--- /dev/null
+++ b/drivers/hwmon/sfctemp.c
@@ -0,0 +1,309 @@
+// 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/completion.h>
+#include <linux/delay.h>
+#include <linux/hwmon.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/platform_device.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 calibration mode enable.
+ * 0:disable 1:enable */
+#define SFCTEMP_CAL BIT(4)
+
+/* TempSensor signature enable. Generate a toggle value outputting on DOUT for
+ * test purpose.
+ * 0:disable 1:enable */
+#define SFCTEMP_SGN BIT(5)
+
+/* TempSensor test access control.
+ * 0000:normal 0001:Test1 0010:Test2 0011:Test3
+ * 0100:Test4 1000:Test8 1001:Test9 */
+#define SFCTEMP_TM_Pos 12
+#define SFCTEMP_TM_Msk GENMASK(15, 12)
+
+/* TempSensor conversion value output.
+ * Temp(c)=DOUT*Y/4094 - K */
+#define SFCTEMP_DOUT_Pos 16
+#define SFCTEMP_DOUT_Msk GENMASK(27, 16)
+
+/* TempSensor digital test output. */
+#define SFCTEMP_DIGO BIT(31)
+
+/* DOUT to Celcius conversion constants */
+#define SFCTEMP_Y1000 237500L
+#define SFCTEMP_Z 4094L
+#define SFCTEMP_K1000 81100L
+
+struct sfctemp {
+ struct mutex lock;
+ struct completion conversion_done;
+ void __iomem *regs;
+ 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)
+{
+ mutex_lock(&sfctemp->lock);
+ if (sfctemp->enabled)
+ goto done;
+
+ sfctemp_power_up(sfctemp);
+ sfctemp->enabled = true;
+done:
+ mutex_unlock(&sfctemp->lock);
+ return 0;
+}
+
+static int sfctemp_disable(struct sfctemp *sfctemp)
+{
+ mutex_lock(&sfctemp->lock);
+ if (!sfctemp->enabled)
+ goto done;
+
+ sfctemp_power_down(sfctemp);
+ sfctemp->enabled = false;
+done:
+ mutex_unlock(&sfctemp->lock);
+ return 0;
+}
+
+static int sfctemp_convert(struct sfctemp *sfctemp, long *val)
+{
+ long 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)
+ 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 resource *mem;
+ struct sfctemp *sfctemp;
+ long val;
+ 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);
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ sfctemp->regs = devm_ioremap_resource(dev, mem);
+ if (IS_ERR(sfctemp->regs))
+ return PTR_ERR(sfctemp->regs);
+
+ ret = platform_get_irq(pdev, 0);
+ if (ret < 0)
+ return ret;
+
+ ret = devm_request_irq(dev, ret, sfctemp_isr,
+ IRQF_SHARED, pdev->name, sfctemp);
+ if (ret) {
+ dev_err(dev, "request irq failed: %d\n", ret);
+ return ret;
+ }
+
+ ret = sfctemp_enable(sfctemp);
+ if (ret)
+ return ret;
+
+ hwmon_dev = hwmon_device_register_with_info(dev, pdev->name, sfctemp,
+ &sfctemp_chip_info, NULL);
+ if (IS_ERR(hwmon_dev))
+ return PTR_ERR(hwmon_dev);
+
+ /* do a conversion to check everything works */
+ ret = sfctemp_convert(sfctemp, &val);
+ if (ret) {
+ hwmon_device_unregister(hwmon_dev);
+ return ret;
+ }
+
+ dev_info(dev, "%ld.%03ld C\n", val / 1000, val % 1000);
+ return 0;
+}
+
+static int sfctemp_remove(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct sfctemp *sfctemp = dev_get_drvdata(dev);
+
+ hwmon_device_unregister(dev);
+ return sfctemp_disable(sfctemp);
+}
+
+static const struct of_device_id sfctemp_of_match[] = {
+ { .compatible = "starfive,jh7100-temp" },
+ { /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, sfctemp_of_match);
+
+static struct platform_driver sfctemp_driver = {
+ .driver = {
+ .name = "sfctemp",
+ .of_match_table = of_match_ptr(sfctemp_of_match),
+ },
+ .probe = sfctemp_probe,
+ .remove = sfctemp_remove,
+};
+module_platform_driver(sfctemp_driver);
+
+MODULE_AUTHOR("Emil Renner Berthing");
+MODULE_DESCRIPTION("StarFive JH7100 temperature sensor driver");
+MODULE_LICENSE("GPL");
--
2.32.0
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