From: Lars Randers <lranders@xxxxxxx>
Signed-off-by: Lars Randers <lranders@xxxxxxx>
Signed-off-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
---
drivers/hwmon/Kconfig | 12 ++
drivers/hwmon/Makefile | 1 +
drivers/hwmon/tvs-mpfs.c | 379 +++++++++++++++++++++++++++++++++
drivers/mailbox/mailbox-mpfs.c | 1 +
4 files changed, 393 insertions(+)
create mode 100644 drivers/hwmon/tvs-mpfs.c
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index b60fe2e58ad6..2d2bed68dcad 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -2295,6 +2295,18 @@ config SENSORS_TMP513
This driver can also be built as a module. If so, the module
will be called tmp513.
+config SENSORS_TVS_MPFS
+ tristate "PolarFire SoC (MPFS) temperature and voltage sensor"
+ depends on POLARFIRE_SOC_MAILBOX
+ help
+ This driver adds support for the PolarFire SoC (MPFS) Temperature and
+ Voltage Sensor.
+
+ To compile this driver as a module, choose M here. the
+ module will be called tvs-mpfs.
+
+ If unsure, say N.
+
config SENSORS_VEXPRESS
tristate "Versatile Express"
depends on VEXPRESS_CONFIG
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index b1c7056c37db..7f44c2567008 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -220,6 +220,7 @@ obj-$(CONFIG_SENSORS_TMP401) += tmp401.o
obj-$(CONFIG_SENSORS_TMP421) += tmp421.o
obj-$(CONFIG_SENSORS_TMP464) += tmp464.o
obj-$(CONFIG_SENSORS_TMP513) += tmp513.o
+obj-$(CONFIG_SENSORS_TVS_MPFS) += tvs-mpfs.o
obj-$(CONFIG_SENSORS_VEXPRESS) += vexpress-hwmon.o
obj-$(CONFIG_SENSORS_VIA_CPUTEMP)+= via-cputemp.o
obj-$(CONFIG_SENSORS_VIA686A) += via686a.o
diff --git a/drivers/hwmon/tvs-mpfs.c b/drivers/hwmon/tvs-mpfs.c
new file mode 100644
index 000000000000..6f117d0b7db6
--- /dev/null
+++ b/drivers/hwmon/tvs-mpfs.c
@@ -0,0 +1,379 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *
+ * Author: Lars Randers <lranders@xxxxxxx>
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/freezer.h>
+#include <linux/kthread.h>
+#include <linux/hwmon.h>
+#include <linux/io.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#define PFSOC_CONTROL_SCB_TVS_CONTROL 0x08
+#define PFSOC_CONTROL_SCB_TVS_OUTPUT0 0x24
+#define PFSOC_CONTROL_SCB_TVS_OUTPUT1 0x28
+
+#define CTRL_POWEROFF BIT(5)
+#define CTRL_ABORT BIT(4)
+#define CTRL_TEMP BIT(3)
+#define CTRL_2P5 BIT(2)
+#define CTRL_1P8 BIT(1)
+#define CTRL_1P05 BIT(0)
+
+#define OUTPUT0_U1P8_MASK GENMASK(30, 16)
+#define OUTPUT0_U1P8_OFF 16
+#define OUTPUT0_U1P0_MASK GENMASK(14, 0)
+#define OUTPUT0_U1P0_OFF 0
+#define OUTPUT1_TEMP_MASK GENMASK(31, 16)
+#define OUTPUT1_TEMP_OFF 16
+#define OUTPUT1_U2P5_MASK GENMASK(14, 0)
+#define OUTPUT1_U2P5_OFF 0
+
+#define MPFS_TVS_MIN_POLL_INTERVAL_IN_MILLIS 2000
+
+/* The following constant is 273.5 in (16.4) fixedpoint notation */
+#define MPFS_TVS_MIN_TEMP_IN_K 0x1112
+
+typedef struct {
+ long min;
+ long actual;
+ long max;
+} mpfs_tvs_sensor_t;
+
+typedef enum {
+ SN_V1P05 = 0,
+ SN_V1P8,
+ SN_V2P5,
+ SN_TEMP,
+
+ SN_MAX
+} mpfs_tvs_sn_t;
+
+static const char *mpfs_tvs_voltage_labels[] = { "U1P05", "U1P8", "U2P5" };
+
+struct mpfs_tvs {
+ struct device *dev;
+ struct device *hwmon_dev;
+ struct task_struct *poll_task;
+ struct regmap *regmap;
+ bool kthread_running;
+ long update_interval; /* in milli-seconds */
+ mpfs_tvs_sensor_t sensors[SN_MAX];
+};
+
+static int mpfs_tvs_update_sensors(struct mpfs_tvs *data) {
+ u32 temp;
+ u32 work;
+ int ret;
+
+ ret = regmap_read(data->regmap, PFSOC_CONTROL_SCB_TVS_OUTPUT1, &temp);
+ if (ret)
+ return ret;
+
+ work = temp;
+
+ temp = (temp & OUTPUT1_TEMP_MASK) >> OUTPUT1_TEMP_OFF;
+ temp = clamp_val(temp, MPFS_TVS_MIN_TEMP_IN_K, INT_MAX);
+ temp = temp - MPFS_TVS_MIN_TEMP_IN_K; /* Kelvin to Celsius */
+ temp = (1000 * temp) >> 4; /* fixed point (10.4) to millicentigrade */
+ data->sensors[SN_TEMP].actual = temp;
+ data->sensors[SN_TEMP].max =
+ max(data->sensors[SN_TEMP].actual, data->sensors[SN_TEMP].max);
+ data->sensors[SN_TEMP].min =
+ min(data->sensors[SN_TEMP].min, data->sensors[SN_TEMP].actual);
+
+ work &= OUTPUT1_U2P5_MASK;
+ /* fixed point (11.3) adjust; value is already millivolts */
+ work = (1 * work) >> 3;
+ data->sensors[SN_V2P5].actual = work;
+ data->sensors[SN_V2P5].max =
+ max(data->sensors[SN_V2P5].actual, data->sensors[SN_V2P5].max);
+ data->sensors[SN_V2P5].min =
+ min(data->sensors[SN_V2P5].min, data->sensors[SN_V2P5].actual);
+
+ ret = regmap_read(data->regmap, PFSOC_CONTROL_SCB_TVS_OUTPUT0, &temp);
+ if (ret)
+ return ret;
+
+ work = temp;
+ temp = (OUTPUT0_U1P8_MASK & temp) >> OUTPUT0_U1P8_OFF;
+ /* fixed point (11.3) adjust; value is already millivolts */
+ temp = (1 * temp) >> 3;
+ data->sensors[SN_V1P8].actual = temp;
+ data->sensors[SN_V1P8].max =
+ max(data->sensors[SN_V1P8].actual, data->sensors[SN_V1P8].max);
+ data->sensors[SN_V2P5].min =
+ min(data->sensors[SN_V1P8].min, data->sensors[SN_V1P8].actual);
+
+ work &= OUTPUT0_U1P0_MASK;
+ /* fixed point (11.3) adjust; value is already millivolts */
+ work = (1 * work) >> 3;
+ data->sensors[SN_V1P05].actual = work;
+ data->sensors[SN_V1P05].max =
+ max(data->sensors[SN_V1P05].actual, data->sensors[SN_V1P05].max);
+ data->sensors[SN_V1P05].min =
+ min(data->sensors[SN_V1P05].min, data->sensors[SN_V1P05].actual);
+
+ return 0;
+}
+
+
+static int mpfs_tvs_chip_read(struct mpfs_tvs *data, long *val)
+{
+ *val = data->update_interval;
+ return 0;
+}
+
+static int mpfs_tvs_temp_read(struct mpfs_tvs *data, u32 attr,
+ int channel, long *val)
+{
+ switch(attr) {
+ case hwmon_temp_input:
+ *val = data->sensors[SN_TEMP].actual;
+ break;
+
+ case hwmon_temp_max:
+ *val = data->sensors[SN_TEMP].max;
+ break;
+
+ default:
+ return -EOPNOTSUPP;
+ }
+ return 0;
+}
+
+static int mpfs_tvs_voltage_read(struct mpfs_tvs *data, u32 attr,
+ int channel, long *val)
+{
+ dev_dbg(data->dev, "read voltage chan %d\n", channel);
+ switch(attr) {
+ case hwmon_in_input:
+ *val = data->sensors[channel].actual;
+ break;
+
+ case hwmon_in_max:
+ *val = data->sensors[channel].max;
+ break;
+
+ default:
+ return -EOPNOTSUPP;
+ }
+ return 0;
+}
+
+
+static ssize_t mpfs_tvs_interval_write(struct mpfs_tvs *data, long val)
+{
+ data->update_interval =
+ clamp_val(val, MPFS_TVS_MIN_POLL_INTERVAL_IN_MILLIS, INT_MAX);
+ return 0;
+}
+
+
+static umode_t mpfs_tvs_is_visible(const void *data,
+ enum hwmon_sensor_types type,
+ u32 attr, int channel)
+{
+ if(type == hwmon_chip && attr == hwmon_chip_update_interval)
+ return 0644;
+
+ if(type == hwmon_temp) {
+ switch(attr) {
+ case hwmon_temp_input:
+ case hwmon_temp_max:
+ case hwmon_temp_label:
+ return 0444;
+
+ default:
+ return 0;
+ }
+ } else if(type == hwmon_in) {
+ switch(attr) {
+ case hwmon_in_input:
+ case hwmon_in_label:
+ return 0444;
+
+ default:
+ return 0;
+ }
+ }
+ return 0;
+}
+
+static int mpfs_tvs_read(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long *val)
+{
+ struct mpfs_tvs *data = dev_get_drvdata(dev);
+
+ switch(type) {
+ case hwmon_temp:
+ return mpfs_tvs_temp_read(data, attr, channel, val);
+ case hwmon_in:
+ return mpfs_tvs_voltage_read(data, attr, channel, val);
+ case hwmon_chip:
+ return mpfs_tvs_chip_read(data, val);
+
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static int mpfs_tvs_write(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long val)
+{
+ struct mpfs_tvs *data = dev_get_drvdata(dev);
+
+ switch(type) {
+ case hwmon_chip:
+ return mpfs_tvs_interval_write(data, val);
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static int mpfs_tvs_read_labels(struct device *dev,
+ enum hwmon_sensor_types type,
+ u32 attr, int channel,
+ const char **str)
+{
+ switch(type) {
+ case hwmon_temp:
+ *str = "CPU Temp";
+ return 0;
+ case hwmon_in:
+ *str = mpfs_tvs_voltage_labels[channel];
+ return 0;
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+
+static const struct hwmon_ops mpfs_tvs_ops = {
+ .is_visible = mpfs_tvs_is_visible,
+ .read_string = mpfs_tvs_read_labels,
+ .read = mpfs_tvs_read,
+ .write = mpfs_tvs_write,
+};
+
+static const struct hwmon_channel_info *mpfs_tvs_info[] = {
+ HWMON_CHANNEL_INFO(chip,
+ HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL),
+ HWMON_CHANNEL_INFO(temp,
+ HWMON_T_INPUT | HWMON_T_MIN |
+ HWMON_T_MAX | HWMON_T_LABEL),
+ HWMON_CHANNEL_INFO(in,
+ HWMON_I_INPUT | HWMON_I_LABEL,
+ HWMON_I_INPUT | HWMON_I_LABEL,
+ HWMON_I_INPUT | HWMON_I_LABEL),
+ NULL
+};
+
+static const struct hwmon_chip_info mpfs_tvs_chip_info = {
+ .ops = &mpfs_tvs_ops,
+ .info = mpfs_tvs_info,
+};
+
+
+static int mpfs_tvs_poll_task(void *ptr)
+{
+ struct mpfs_tvs *data = ptr;
+ int ret = 0;
+
+ data->kthread_running = true;
+
+ set_freezable();
+
+ while(!kthread_should_stop()) {
+ schedule_timeout_interruptible(data->update_interval);
+ try_to_freeze();
+ ret = mpfs_tvs_update_sensors(data);
+ if(ret)
+ break;
+ }
+
+ data->kthread_running = false;
+ return ret;
+}
+
+static int mpfs_tvs_probe(struct platform_device *pdev)
+{
+ struct device *hwmon_dev;
+ struct mpfs_tvs *data;
+ struct task_struct *task;
+ int err;
+
+ data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+ if(!data)
+ return -ENOMEM;
+
+ data->dev = &pdev->dev;
+
+ data->regmap = syscon_node_to_regmap(data->dev->of_node->parent);
+
+ data->kthread_running = false;
+
+ hwmon_dev = devm_hwmon_device_register_with_info(data->dev, "mpfs_tvs",
+ data,
+ &mpfs_tvs_chip_info,
+ NULL);
+
+ if(IS_ERR(hwmon_dev)) {
+ err = PTR_ERR(hwmon_dev);
+ dev_err(data->dev, "Class registration failed (%d)\n", err);
+ return err;
+ }
+
+ /* enable HW sensor */
+ err = regmap_write(data->regmap, PFSOC_CONTROL_SCB_TVS_CONTROL,
+ CTRL_1P05 | CTRL_1P8 | CTRL_2P5 | CTRL_TEMP);
+
+ data->hwmon_dev = hwmon_dev;
+ data->sensors[SN_TEMP].max = 0;
+ data->sensors[SN_V1P05].min =
+ data->sensors[SN_V1P8].min =
+ data->sensors[SN_V2P5].min = 20000;
+ data->sensors[SN_V1P05].max =
+ data->sensors[SN_V1P8].max =
+ data->sensors[SN_V2P5].max = 0;
+ data->update_interval = MPFS_TVS_MIN_POLL_INTERVAL_IN_MILLIS;
+ mpfs_tvs_update_sensors(data);
+
+ task = kthread_run(mpfs_tvs_poll_task, data, "tvs-mpfs-kthread");
+ if (IS_ERR(task)) {
+ err = PTR_ERR(task);
+ dev_err(data->dev, "Unable to run kthread err %d\n", err);
+ return err;
+ }
+
+ data->poll_task = task;
+
+ dev_info(data->dev, "Registered MPFS TVS auxiliary driver\n");
+ return 0;
+}
+
+static const struct of_device_id mpfs_tvs_of_match[] = {
+ { .compatible = "microchip,mpfs-tvs", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, mpfs_tvs_of_match);
+
+static struct platform_driver mpfs_tvs_driver = {
+ .probe = mpfs_tvs_probe,
+ .driver = {
+ .name = "mpfs-tvs",
+ .of_match_table = mpfs_tvs_of_match,
+ },
+};
+module_platform_driver(mpfs_tvs_driver);
+
+MODULE_AUTHOR("Lars Randers <lranders@xxxxxxx>");
+MODULE_DESCRIPTION("PolarFire SoC temperature & voltage sensor driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/mailbox/mailbox-mpfs.c b/drivers/mailbox/mailbox-mpfs.c
index 20ee283a04cc..0fd83bdd4cee 100644
--- a/drivers/mailbox/mailbox-mpfs.c
+++ b/drivers/mailbox/mailbox-mpfs.c
@@ -262,6 +262,7 @@ static int mpfs_mbox_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "Registering MPFS mailbox controller failed\n");
return ret;
}
+
dev_info(&pdev->dev, "Registered MPFS mailbox controller driver\n");
return 0;
--
2.43.0
