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authorLars Povlsen <lars.povlsen@microchip.com>2020-06-18 15:59:51 +0200
committerGuenter Roeck <linux@roeck-us.net>2020-07-24 07:44:57 -0700
commite4922176e1669f174e101d321d76fdc1a134f7ac (patch)
tree5a0badd8462380caa20b086dc3dd0a8de44c95b4 /drivers/hwmon
parentf5520753c16f2b24610f5f3cef4cc3e8f589b95e (diff)
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hwmon: sparx5: Add Sparx5 SoC temperature driver
This patch adds a temperature sensor driver to the Sparx5 SoC. Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Link: https://lore.kernel.org/r/20200618135951.25441-4-lars.povlsen@microchip.com Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r--drivers/hwmon/Kconfig10
-rw-r--r--drivers/hwmon/Makefile1
-rw-r--r--drivers/hwmon/sparx5-temp.c168
3 files changed, 179 insertions, 0 deletions
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 7b11d622b82d..8dc28b26916e 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -525,6 +525,16 @@ config SENSORS_I5K_AMB
This driver can also be built as a module. If so, the module
will be called i5k_amb.
+config SENSORS_SPARX5
+ tristate "Sparx5 SoC temperature sensor"
+ depends on ARCH_SPARX5 || COMPILE_TEST
+ help
+ If you say yes here you get support for temperature monitoring
+ with the Microchip Sparx5 SoC.
+
+ This driver can also be built as a module. If so, the module
+ will be called sparx5-temp.
+
config SENSORS_F71805F
tristate "Fintek F71805F/FG, F71806F/FG and F71872F/FG"
depends on !PPC
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 18e1ef74ade7..a8f4b35b136b 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -168,6 +168,7 @@ obj-$(CONFIG_SENSORS_SMM665) += smm665.o
obj-$(CONFIG_SENSORS_SMSC47B397)+= smsc47b397.o
obj-$(CONFIG_SENSORS_SMSC47M1) += smsc47m1.o
obj-$(CONFIG_SENSORS_SMSC47M192)+= smsc47m192.o
+obj-$(CONFIG_SENSORS_SPARX5) += sparx5-temp.o
obj-$(CONFIG_SENSORS_STTS751) += stts751.o
obj-$(CONFIG_SENSORS_AMC6821) += amc6821.o
obj-$(CONFIG_SENSORS_TC74) += tc74.o
diff --git a/drivers/hwmon/sparx5-temp.c b/drivers/hwmon/sparx5-temp.c
new file mode 100644
index 000000000000..7d7a060259a8
--- /dev/null
+++ b/drivers/hwmon/sparx5-temp.c
@@ -0,0 +1,168 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Sparx5 SoC temperature sensor driver
+ *
+ * Copyright (C) 2020 Lars Povlsen <lars.povlsen@microchip.com>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/hwmon.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#define TEMP_CTRL 0
+#define TEMP_CFG 4
+#define TEMP_CFG_CYCLES GENMASK(24, 15)
+#define TEMP_CFG_ENA BIT(0)
+#define TEMP_STAT 8
+#define TEMP_STAT_VALID BIT(12)
+#define TEMP_STAT_TEMP GENMASK(11, 0)
+
+struct s5_hwmon {
+ void __iomem *base;
+ struct clk *clk;
+};
+
+static void s5_temp_clk_disable(void *data)
+{
+ struct clk *clk = data;
+
+ clk_disable_unprepare(clk);
+}
+
+static void s5_temp_enable(struct s5_hwmon *hwmon)
+{
+ u32 val = readl(hwmon->base + TEMP_CFG);
+ u32 clk = clk_get_rate(hwmon->clk) / USEC_PER_SEC;
+
+ val &= ~TEMP_CFG_CYCLES;
+ val |= FIELD_PREP(TEMP_CFG_CYCLES, clk);
+ val |= TEMP_CFG_ENA;
+
+ writel(val, hwmon->base + TEMP_CFG);
+}
+
+static int s5_read(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long *temp)
+{
+ struct s5_hwmon *hwmon = dev_get_drvdata(dev);
+ int rc = 0, value;
+ u32 stat;
+
+ switch (attr) {
+ case hwmon_temp_input:
+ stat = readl_relaxed(hwmon->base + TEMP_STAT);
+ if (!(stat & TEMP_STAT_VALID))
+ return -EIO;
+ value = stat & TEMP_STAT_TEMP;
+ /*
+ * From register documentation:
+ * Temp(C) = TEMP_SENSOR_STAT.TEMP / 4096 * 352.2 - 109.4
+ */
+ value = DIV_ROUND_CLOSEST(value * 3522, 4096) - 1094;
+ /*
+ * Scale down by 10 from above and multiply by 1000 to
+ * have millidegrees as specified by the hwmon sysfs
+ * interface.
+ */
+ value *= 100;
+ *temp = value;
+ break;
+ default:
+ rc = -EOPNOTSUPP;
+ break;
+ }
+
+ return rc;
+}
+
+static umode_t s5_is_visible(const void *_data, enum hwmon_sensor_types type,
+ u32 attr, int channel)
+{
+ if (type != hwmon_temp)
+ return 0;
+
+ switch (attr) {
+ case hwmon_temp_input:
+ return 0444;
+ default:
+ return 0;
+ }
+}
+
+static const struct hwmon_channel_info *s5_info[] = {
+ HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
+ HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT),
+ NULL
+};
+
+static const struct hwmon_ops s5_hwmon_ops = {
+ .is_visible = s5_is_visible,
+ .read = s5_read,
+};
+
+static const struct hwmon_chip_info s5_chip_info = {
+ .ops = &s5_hwmon_ops,
+ .info = s5_info,
+};
+
+static int s5_temp_probe(struct platform_device *pdev)
+{
+ struct device *hwmon_dev;
+ struct s5_hwmon *hwmon;
+ int ret;
+
+ hwmon = devm_kzalloc(&pdev->dev, sizeof(*hwmon), GFP_KERNEL);
+ if (!hwmon)
+ return -ENOMEM;
+
+ hwmon->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(hwmon->base))
+ return PTR_ERR(hwmon->base);
+
+ hwmon->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(hwmon->clk))
+ return PTR_ERR(hwmon->clk);
+
+ ret = clk_prepare_enable(hwmon->clk);
+ if (ret)
+ return ret;
+
+ ret = devm_add_action_or_reset(&pdev->dev, s5_temp_clk_disable,
+ hwmon->clk);
+ if (ret)
+ return ret;
+
+ s5_temp_enable(hwmon);
+
+ hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev,
+ "s5_temp",
+ hwmon,
+ &s5_chip_info,
+ NULL);
+
+ return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+const struct of_device_id s5_temp_match[] = {
+ { .compatible = "microchip,sparx5-temp" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, s5_temp_match);
+
+static struct platform_driver s5_temp_driver = {
+ .probe = s5_temp_probe,
+ .driver = {
+ .name = "sparx5-temp",
+ .of_match_table = s5_temp_match,
+ },
+};
+
+module_platform_driver(s5_temp_driver);
+
+MODULE_AUTHOR("Lars Povlsen <lars.povlsen@microchip.com>");
+MODULE_DESCRIPTION("Sparx5 SoC temperature sensor driver");
+MODULE_LICENSE("GPL");