[PATCH v2 3/3] thermal: cv180x: Add cv180x thermal driver support
From: Haylen Chu
Date: Tue Jun 04 2024 - 08:57:15 EST
Add support for cv180x SoCs integrated thermal sensors.
Signed-off-by: Haylen Chu <heylenay@xxxxxxxxxxx>
---
drivers/thermal/Kconfig | 6 +
drivers/thermal/Makefile | 1 +
drivers/thermal/cv180x_thermal.c | 262 +++++++++++++++++++++++++++++++
3 files changed, 269 insertions(+)
create mode 100644 drivers/thermal/cv180x_thermal.c
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index 204ed89a3ec9..f53c973a361d 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -514,4 +514,10 @@ config LOONGSON2_THERMAL
is higher than the high temperature threshold or lower than the low
temperature threshold, the interrupt will occur.
+config CV180X_THERMAL
+ tristate "Temperature sensor driver for Sophgo CV180X"
+ help
+ If you say yes here you get support for thermal sensor integrated in
+ Sophgo CV180X SoCs.
+
endif
diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
index 5cdf7d68687f..5b59bde8a579 100644
--- a/drivers/thermal/Makefile
+++ b/drivers/thermal/Makefile
@@ -65,3 +65,4 @@ obj-$(CONFIG_AMLOGIC_THERMAL) += amlogic_thermal.o
obj-$(CONFIG_SPRD_THERMAL) += sprd_thermal.o
obj-$(CONFIG_KHADAS_MCU_FAN_THERMAL) += khadas_mcu_fan.o
obj-$(CONFIG_LOONGSON2_THERMAL) += loongson2_thermal.o
+obj-$(CONFIG_CV180X_THERMAL) += cv180x_thermal.o
diff --git a/drivers/thermal/cv180x_thermal.c b/drivers/thermal/cv180x_thermal.c
new file mode 100644
index 000000000000..89425e2b75a2
--- /dev/null
+++ b/drivers/thermal/cv180x_thermal.c
@@ -0,0 +1,262 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2021 Sophgo Inc.
+ * Copyright (C) 2024 Haylen Chu <heylenay@xxxxxxxxxxx>
+ */
+
+#include <linux/bits.h>
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/thermal.h>
+
+#define TEMPSEN_VERSION 0x0
+#define TEMPSEN_CTRL 0x4
+#define TEMPSEN_CTRL_EN BIT(0)
+#define TEMPSEN_CTRL_SEL_MASK GENMASK(7, 4)
+#define TEMPSEN_CTRL_SEL_OFFSET 4
+#define TEMPSEN_STATUS 0x8
+#define TEMPSEN_SET 0xc
+#define TEMPSEN_SET_CHOPSEL_MASK GENMASK(5, 4)
+#define TEMPSEN_SET_CHOPSEL_OFFSET 4
+#define TEMPSEN_SET_CHOPSEL_128T 0
+#define TEMPSEN_SET_CHOPSEL_256T 1
+#define TEMPSEN_SET_CHOPSEL_512T 2
+#define TEMPSEN_SET_CHOPSEL_1024T 3
+#define TEMPSEN_SET_ACCSEL_MASK GENMASK(7, 6)
+#define TEMPSEN_SET_ACCSEL_OFFSET 6
+#define TEMPSEN_SET_ACCSEL_512T 0
+#define TEMPSEN_SET_ACCSEL_1024T 1
+#define TEMPSEN_SET_ACCSEL_2048T 2
+#define TEMPSEN_SET_ACCSEL_4096T 3
+#define TEMPSEN_SET_CYC_CLKDIV_MASK GENMASK(15, 8)
+#define TEMPSEN_SET_CYC_CLKDIV_OFFSET 8
+#define TEMPSEN_INTR_EN 0x10
+#define TEMPSEN_INTR_CLR 0x14
+#define TEMPSEN_INTR_STA 0x18
+#define TEMPSEN_INTR_RAW 0x1c
+#define TEMPSEN_RESULT(n) (0x20 + (n) * 4)
+#define TEMPSEN_RESULT_RESULT_MASK GENMASK(12, 0)
+#define TEMPSEN_RESULT_MAX_RESULT_MASK GENMASK(28, 16)
+#define TEMPSEN_RESULT_CLR_MAX_RESULT BIT(31)
+#define TEMPSEN_AUTO_PERIOD 0x64
+#define TEMPSEN_AUTO_PERIOD_AUTO_CYCLE_MASK GENMASK(23, 0)
+#define TEMPSEN_AUTO_PERIOD_AUTO_CYCLE_OFFSET 0
+
+struct cv180x_thermal_zone {
+ struct device *dev;
+ void __iomem *base;
+ struct clk *clk_tempsen;
+ u32 chop_period;
+ u32 accum_period;
+ u32 sample_cycle;
+};
+
+static void cv180x_thermal_init(struct cv180x_thermal_zone *ctz)
+{
+ void __iomem *base = ctz->base;
+ u32 regval;
+
+ writel(readl(base + TEMPSEN_INTR_RAW), base + TEMPSEN_INTR_CLR);
+ writel(TEMPSEN_RESULT_CLR_MAX_RESULT, base + TEMPSEN_RESULT(0));
+
+ regval = readl(base + TEMPSEN_SET);
+ regval &= ~TEMPSEN_SET_CHOPSEL_MASK;
+ regval &= ~TEMPSEN_SET_ACCSEL_MASK;
+ regval &= ~TEMPSEN_SET_CYC_CLKDIV_MASK;
+ regval |= ctz->chop_period << TEMPSEN_SET_CHOPSEL_OFFSET;
+ regval |= ctz->accum_period << TEMPSEN_SET_ACCSEL_OFFSET;
+ regval |= 0x31 << TEMPSEN_SET_CYC_CLKDIV_OFFSET;
+ writel(regval, base + TEMPSEN_SET);
+
+ regval = readl(base + TEMPSEN_AUTO_PERIOD);
+ regval &= ~TEMPSEN_AUTO_PERIOD_AUTO_CYCLE_MASK;
+ regval |= ctz->sample_cycle << TEMPSEN_AUTO_PERIOD_AUTO_CYCLE_OFFSET;
+ writel(regval, base + TEMPSEN_AUTO_PERIOD);
+
+ regval = readl(base + TEMPSEN_CTRL);
+ regval &= ~TEMPSEN_CTRL_SEL_MASK;
+ regval |= 1 << TEMPSEN_CTRL_SEL_OFFSET;
+ regval |= TEMPSEN_CTRL_EN;
+ writel(regval, base + TEMPSEN_CTRL);
+}
+
+static void cv180x_thermal_deinit(struct cv180x_thermal_zone *ct)
+{
+ void __iomem *base = ct->base;
+ u32 regval;
+
+ regval = readl(base + TEMPSEN_CTRL);
+ regval &= ~(TEMPSEN_CTRL_SEL_MASK | TEMPSEN_CTRL_EN);
+ writel(regval, base + TEMPSEN_CTRL);
+
+ writel(readl(base + TEMPSEN_INTR_RAW), base + TEMPSEN_INTR_CLR);
+}
+
+/*
+ * Raw register value to temperature (mC) formula:
+ *
+ * read_val * 1000 * 716
+ * Temperature = ----------------------- - 273000
+ * divider
+ *
+ * where divider should be ticks number of accumulation period,
+ * e.g. 2048 for TEMPSEN_CTRL_ACCSEL_2048T
+ */
+static int cv180x_calc_temp(struct cv180x_thermal_zone *ctz, u32 result)
+{
+ u32 divider = (u32)(512 * int_pow(2, ctz->accum_period));
+
+ return (result * 1000) * 716 / divider - 273000;
+}
+
+static int cv180x_get_temp(struct thermal_zone_device *tdev, int *temperature)
+{
+ struct cv180x_thermal_zone *ctz = thermal_zone_device_priv(tdev);
+ void __iomem *base = ctz->base;
+ u32 result;
+
+ result = readl(base + TEMPSEN_RESULT(0)) & TEMPSEN_RESULT_RESULT_MASK;
+ *temperature = cv180x_calc_temp(ctz, result);
+
+ return 0;
+}
+
+static const struct thermal_zone_device_ops cv180x_thermal_ops = {
+ .get_temp = cv180x_get_temp,
+};
+
+static const struct of_device_id cv180x_thermal_of_match[] = {
+ { .compatible = "sophgo,cv1800-thermal" },
+ { .compatible = "sophgo,cv180x-thermal" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, cv180x_thermal_of_match);
+
+static int
+cv180x_parse_dt(struct cv180x_thermal_zone *ctz)
+{
+ struct device_node *np = ctz->dev->of_node;
+
+ if (of_property_read_u32(np, "accumulation-period",
+ &ctz->accum_period)) {
+ ctz->accum_period = TEMPSEN_SET_ACCSEL_2048T;
+ } else {
+ if (ctz->accum_period < TEMPSEN_SET_ACCSEL_512T ||
+ ctz->accum_period > TEMPSEN_SET_ACCSEL_4096T) {
+ dev_err(ctz->dev, "invalid accumulation period %d\n",
+ ctz->accum_period);
+ return -EINVAL;
+ }
+ }
+
+ if (of_property_read_u32(np, "chop-period", &ctz->chop_period)) {
+ ctz->chop_period = TEMPSEN_SET_CHOPSEL_1024T;
+ } else {
+ if (ctz->chop_period < TEMPSEN_SET_CHOPSEL_128T ||
+ ctz->chop_period > TEMPSEN_SET_CHOPSEL_1024T) {
+ dev_err(ctz->dev, "invalid chop period %d\n",
+ ctz->chop_period);
+ return -EINVAL;
+ }
+ }
+
+ if (of_property_read_u32(np, "sample-cycle-us", &ctz->sample_cycle))
+ ctz->sample_cycle = 1000000;
+
+ return 0;
+}
+
+static int cv180x_thermal_probe(struct platform_device *pdev)
+{
+ struct cv180x_thermal_zone *ctz;
+ struct thermal_zone_device *tz;
+ struct resource *res;
+ int ret;
+
+ ctz = devm_kzalloc(&pdev->dev, sizeof(*ctz), GFP_KERNEL);
+ if (!ctz)
+ return -ENOMEM;
+
+ ctz->dev = &pdev->dev;
+
+ ret = cv180x_parse_dt(ctz);
+ if (ret)
+ return dev_err_probe(&pdev->dev, ret, "failed to parse dt\n");
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ ctz->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(ctz->base))
+ return dev_err_probe(&pdev->dev, PTR_ERR(ctz->base),
+ "failed to map tempsen registers\n");
+
+ ctz->clk_tempsen = devm_clk_get(&pdev->dev, "clk_tempsen");
+ if (IS_ERR(ctz->clk_tempsen))
+ return dev_err_probe(&pdev->dev, PTR_ERR(ctz->clk_tempsen),
+ "failed to get clk_tempsen\n");
+
+ clk_prepare_enable(ctz->clk_tempsen);
+
+ cv180x_thermal_init(ctz);
+
+ tz = devm_thermal_of_zone_register(&pdev->dev, 0, ctz,
+ &cv180x_thermal_ops);
+ if (IS_ERR(tz))
+ return dev_err_probe(&pdev->dev, PTR_ERR(tz),
+ "failed to register thermal zone\n");
+
+ platform_set_drvdata(pdev, ctz);
+
+ return 0;
+}
+
+static int cv180x_thermal_remove(struct platform_device *pdev)
+{
+ struct cv180x_thermal_zone *ctz = platform_get_drvdata(pdev);
+
+ cv180x_thermal_deinit(ctz);
+ clk_disable_unprepare(ctz->clk_tempsen);
+
+ return 0;
+}
+
+static int __maybe_unused cv180x_thermal_suspend(struct device *dev)
+{
+ struct cv180x_thermal_zone *ctz = dev_get_drvdata(dev);
+
+ cv180x_thermal_deinit(ctz);
+ clk_disable_unprepare(ctz->clk_tempsen);
+
+ return 0;
+}
+
+static int __maybe_unused cv180x_thermal_resume(struct device *dev)
+{
+ struct cv180x_thermal_zone *ctz = dev_get_drvdata(dev);
+
+ clk_prepare_enable(ctz->clk_tempsen);
+ cv180x_thermal_init(ctz);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(cv180x_thermal_pm_ops,
+ cv180x_thermal_suspend, cv180x_thermal_resume);
+
+static struct platform_driver cv180x_thermal_driver = {
+ .probe = cv180x_thermal_probe,
+ .remove = cv180x_thermal_remove,
+ .driver = {
+ .name = "cv180x-thermal",
+ .pm = &cv180x_thermal_pm_ops,
+ .of_match_table = cv180x_thermal_of_match,
+ },
+};
+
+module_platform_driver(cv180x_thermal_driver);
+
+MODULE_DESCRIPTION("Sophgo CV180x thermal driver");
+MODULE_AUTHOR("Haylen Chu <heylenay@xxxxxxxxxxx>");
+MODULE_LICENSE("GPL");
--
2.45.2