[PATCH 2/2] drivers: thermal: Introduce sun8i_thermal
qianfanguijin at 163.com
qianfanguijin at 163.com
Mon Feb 13 03:42:56 CET 2023
From: qianfan Zhao <qianfanguijin at 163.com>
Portting sun8i_thermal.c from linux-5.15 drivers and drop interrupt
features. Next is an example from allwinner T3:
=> temperature get thermal-sensor at 1c24c00
thermal-sensor at 1c24c00: 39437 C
=>
thermal-sensor at 1c24c00: 39776 C
=>
thermal-sensor at 1c24c00: 39437 C
Signed-off-by: qianfan Zhao <qianfanguijin at 163.com>
---
drivers/thermal/Kconfig | 8 +
drivers/thermal/Makefile | 1 +
drivers/thermal/sun8i_thermal.c | 368 ++++++++++++++++++++++++++++++++
3 files changed, 377 insertions(+)
create mode 100644 drivers/thermal/sun8i_thermal.c
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index 97d4163e8e..be3118175f 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -41,4 +41,12 @@ config TI_DRA7_THERMAL
Enable thermal support for for the Texas Instruments DRA752 SoC family.
The driver supports reading CPU temperature.
+config SUN8I_THERMAL
+ bool "Temperature sensor driver for allwinner sunxi SOCs"
+ depends on ARCH_SUNXI
+ select REGMAP
+ help
+ Enable thermal support for for the sunxi SoC family.
+ The driver supports reading CPU temperature.
+
endif # if DM_THERMAL
diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
index 8acc7d20cb..9f419962cc 100644
--- a/drivers/thermal/Makefile
+++ b/drivers/thermal/Makefile
@@ -9,3 +9,4 @@ obj-$(CONFIG_IMX_THERMAL) += imx_thermal.o
obj-$(CONFIG_IMX_SCU_THERMAL) += imx_scu_thermal.o
obj-$(CONFIG_TI_DRA7_THERMAL) += ti-bandgap.o
obj-$(CONFIG_IMX_TMU) += imx_tmu.o
+obj-$(CONFIG_SUN8I_THERMAL) += sun8i_thermal.o
diff --git a/drivers/thermal/sun8i_thermal.c b/drivers/thermal/sun8i_thermal.c
new file mode 100644
index 0000000000..51ea81ccf7
--- /dev/null
+++ b/drivers/thermal/sun8i_thermal.c
@@ -0,0 +1,368 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Thermal sensor driver for Allwinner SOC
+ * Based on the linux driver
+ *
+ * Copyright (C) 2023 qianfan Zhao
+ */
+#include <config.h>
+#include <common.h>
+#include <asm/global_data.h>
+#include <asm/io.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/sys_proto.h>
+#include <dm.h>
+#include <dm/device-internal.h>
+#include <dm/device.h>
+#include <errno.h>
+#include <regmap.h>
+#include <reset.h>
+#include <clk.h>
+#include <linux/delay.h>
+#include <dm/device_compat.h>
+#include <malloc.h>
+#include <thermal.h>
+
+#define FT_TEMP_MASK GENMASK(11, 0)
+#define TEMP_CALIB_MASK GENMASK(11, 0)
+#define CALIBRATE_DEFAULT 0x800
+
+#define SUN8I_THS_CTRL0 0x00
+#define SUN8I_THS_CTRL2 0x40
+#define SUN8I_THS_IC 0x44
+#define SUN8I_THS_IS 0x48
+#define SUN8I_THS_MFC 0x70
+#define SUN8I_THS_TEMP_CALIB 0x74
+#define SUN8I_THS_TEMP_DATA 0x80
+
+#define SUN50I_THS_CTRL0 0x00
+#define SUN50I_H6_THS_ENABLE 0x04
+#define SUN50I_H6_THS_PC 0x08
+#define SUN50I_H6_THS_DIC 0x10
+#define SUN50I_H6_THS_DIS 0x20
+#define SUN50I_H6_THS_MFC 0x30
+#define SUN50I_H6_THS_TEMP_CALIB 0xa0
+#define SUN50I_H6_THS_TEMP_DATA 0xc0
+
+#define SUN8I_THS_CTRL0_T_ACQ0(x) (GENMASK(15, 0) & (x))
+#define SUN8I_THS_CTRL2_T_ACQ1(x) ((GENMASK(15, 0) & (x)) << 16)
+#define SUN8I_THS_DATA_IRQ_STS(x) BIT(x + 8)
+
+#define SUN50I_THS_CTRL0_T_ACQ(x) ((GENMASK(15, 0) & (x)) << 16)
+#define SUN50I_THS_FILTER_EN BIT(2)
+#define SUN50I_THS_FILTER_TYPE(x) (GENMASK(1, 0) & (x))
+#define SUN50I_H6_THS_PC_TEMP_PERIOD(x) ((GENMASK(19, 0) & (x)) << 12)
+#define SUN50I_H6_THS_DATA_IRQ_STS(x) BIT(x)
+
+struct ths_device;
+
+struct ths_thermal_chip {
+ bool has_mod_clk;
+ bool has_bus_clk_reset;
+ int sensor_num;
+ int offset;
+ int scale;
+ int ft_deviation;
+ int temp_data_base;
+ int (*init)(struct ths_device *tmdev);
+ int (*calc_temp)(struct ths_device *tmdev,
+ int id, int reg);
+};
+
+struct ths_device {
+ const struct ths_thermal_chip *chip;
+ struct udevice *dev;
+ struct regmap *regmap;
+ struct reset_ctl *reset;
+ struct clk *bus_clk;
+ struct clk *mod_clk;
+};
+
+/* Temp Unit: millidegree Celsius */
+static int sun8i_ths_calc_temp(struct ths_device *tmdev,
+ int id, int reg)
+{
+ return tmdev->chip->offset - (reg * tmdev->chip->scale / 10);
+}
+
+static int sun50i_h5_calc_temp(struct ths_device *tmdev,
+ int id, int reg)
+{
+ if (reg >= 0x500)
+ return -1191 * reg / 10 + 223000;
+ else if (!id)
+ return -1452 * reg / 10 + 259000;
+ else
+ return -1590 * reg / 10 + 276000;
+}
+
+static int sun8i_ths_get_temp(struct udevice *dev, int *temp)
+{
+ struct ths_device *tmdev = dev_get_plat(dev);
+ int val = 0;
+
+ regmap_read(tmdev->regmap, tmdev->chip->temp_data_base, &val);
+
+ /* ths have no data yet */
+ if (!val)
+ return -EAGAIN;
+
+ *temp = tmdev->chip->calc_temp(tmdev, 0, val);
+ /*
+ * According to the original sdk, there are some platforms(rarely)
+ * that add a fixed offset value after calculating the temperature
+ * value. We can't simply put it on the formula for calculating the
+ * temperature above, because the formula for calculating the
+ * temperature above is also used when the sensor is calibrated. If
+ * do this, the correct calibration formula is hard to know.
+ */
+ *temp += tmdev->chip->ft_deviation;
+
+ return 0;
+}
+
+static int sun8i_ths_resource_init(struct ths_device *tmdev)
+{
+ struct udevice *dev = tmdev->dev;
+ int ret;
+
+ tmdev->regmap = devm_regmap_init(dev, NULL, NULL, NULL);
+ if (IS_ERR(tmdev->regmap))
+ return PTR_ERR(tmdev->regmap);
+
+ if (tmdev->chip->has_bus_clk_reset) {
+ tmdev->reset = devm_reset_control_get_by_index(dev, 0);
+ if (IS_ERR(tmdev->reset))
+ return PTR_ERR(tmdev->reset);
+
+ tmdev->bus_clk = devm_clk_get(dev, "bus");
+ if (IS_ERR(tmdev->bus_clk))
+ return PTR_ERR(tmdev->bus_clk);
+ }
+
+ if (tmdev->chip->has_mod_clk) {
+ tmdev->mod_clk = devm_clk_get(dev, "mod");
+ if (IS_ERR(tmdev->mod_clk))
+ return PTR_ERR(tmdev->mod_clk);
+ }
+
+ ret = reset_deassert(tmdev->reset);
+ if (ret)
+ return ret;
+
+ ret = clk_prepare_enable(tmdev->bus_clk);
+ if (ret)
+ goto assert_reset;
+
+ ret = clk_prepare_enable(tmdev->mod_clk);
+ if (ret)
+ goto bus_disable;
+
+ return 0;
+
+bus_disable:
+ clk_disable_unprepare(tmdev->bus_clk);
+assert_reset:
+ reset_assert(tmdev->reset);
+
+ return ret;
+}
+
+static int sun8i_h3_thermal_init(struct ths_device *tmdev)
+{
+ int val;
+
+ /* average over 4 samples */
+ regmap_write(tmdev->regmap, SUN8I_THS_MFC,
+ SUN50I_THS_FILTER_EN |
+ SUN50I_THS_FILTER_TYPE(1));
+ /*
+ * clkin = 24MHz
+ * filter_samples = 4
+ * period = 0.25s
+ *
+ * x = period * clkin / 4096 / filter_samples - 1
+ * = 365
+ */
+ val = GENMASK(7 + tmdev->chip->sensor_num, 8);
+ regmap_write(tmdev->regmap, SUN8I_THS_IC,
+ SUN50I_H6_THS_PC_TEMP_PERIOD(365) | val);
+ /*
+ * T_acq = 20us
+ * clkin = 24MHz
+ *
+ * x = T_acq * clkin - 1
+ * = 479
+ */
+ regmap_write(tmdev->regmap, SUN8I_THS_CTRL0,
+ SUN8I_THS_CTRL0_T_ACQ0(479));
+ val = GENMASK(tmdev->chip->sensor_num - 1, 0);
+ regmap_write(tmdev->regmap, SUN8I_THS_CTRL2,
+ SUN8I_THS_CTRL2_T_ACQ1(479) | val);
+
+ return 0;
+}
+
+/*
+ * Without this undocumented value, the returned temperatures would
+ * be higher than real ones by about 20C.
+ */
+#define SUN50I_H6_CTRL0_UNK 0x0000002f
+
+static int sun50i_h6_thermal_init(struct ths_device *tmdev)
+{
+ int val;
+
+ /*
+ * T_acq = 20us
+ * clkin = 24MHz
+ *
+ * x = T_acq * clkin - 1
+ * = 479
+ */
+ regmap_write(tmdev->regmap, SUN50I_THS_CTRL0,
+ SUN50I_H6_CTRL0_UNK | SUN50I_THS_CTRL0_T_ACQ(479));
+ /* average over 4 samples */
+ regmap_write(tmdev->regmap, SUN50I_H6_THS_MFC,
+ SUN50I_THS_FILTER_EN |
+ SUN50I_THS_FILTER_TYPE(1));
+ /*
+ * clkin = 24MHz
+ * filter_samples = 4
+ * period = 0.25s
+ *
+ * x = period * clkin / 4096 / filter_samples - 1
+ * = 365
+ */
+ regmap_write(tmdev->regmap, SUN50I_H6_THS_PC,
+ SUN50I_H6_THS_PC_TEMP_PERIOD(365));
+ /* enable sensor */
+ val = GENMASK(tmdev->chip->sensor_num - 1, 0);
+ regmap_write(tmdev->regmap, SUN50I_H6_THS_ENABLE, val);
+ /* thermal data interrupt enable */
+ val = GENMASK(tmdev->chip->sensor_num - 1, 0);
+ regmap_write(tmdev->regmap, SUN50I_H6_THS_DIC, val);
+
+ return 0;
+}
+
+static int sun8i_ths_probe(struct udevice *udev)
+{
+ struct ths_device *tmdev = dev_get_plat(udev);
+ int ret;
+
+ tmdev->dev = udev;
+
+ tmdev->chip =
+ (const struct ths_thermal_chip *)dev_get_driver_data(udev);
+ if (!tmdev->chip)
+ return -EINVAL;
+
+ ret = sun8i_ths_resource_init(tmdev);
+ if (ret)
+ return ret;
+
+ ret = tmdev->chip->init(tmdev);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static const struct dm_thermal_ops sun8i_ths_ops = {
+ .get_temp = sun8i_ths_get_temp,
+};
+
+static const struct ths_thermal_chip sun8i_a83t_ths = {
+ .sensor_num = 3,
+ .scale = 705,
+ .offset = 191668,
+ .temp_data_base = SUN8I_THS_TEMP_DATA,
+ .init = sun8i_h3_thermal_init,
+ .calc_temp = sun8i_ths_calc_temp,
+};
+
+static const struct ths_thermal_chip sun8i_h3_ths = {
+ .sensor_num = 1,
+ .scale = 1211,
+ .offset = 217000,
+ .has_mod_clk = true,
+ .has_bus_clk_reset = true,
+ .temp_data_base = SUN8I_THS_TEMP_DATA,
+ .init = sun8i_h3_thermal_init,
+ .calc_temp = sun8i_ths_calc_temp,
+};
+
+static const struct ths_thermal_chip sun8i_r40_ths = {
+ .sensor_num = 2,
+ .offset = 251086,
+ .scale = 1130,
+ .has_mod_clk = true,
+ .has_bus_clk_reset = true,
+ .temp_data_base = SUN8I_THS_TEMP_DATA,
+ .init = sun8i_h3_thermal_init,
+ .calc_temp = sun8i_ths_calc_temp,
+};
+
+static const struct ths_thermal_chip sun50i_a64_ths = {
+ .sensor_num = 3,
+ .offset = 260890,
+ .scale = 1170,
+ .has_mod_clk = true,
+ .has_bus_clk_reset = true,
+ .temp_data_base = SUN8I_THS_TEMP_DATA,
+ .init = sun8i_h3_thermal_init,
+ .calc_temp = sun8i_ths_calc_temp,
+};
+
+static const struct ths_thermal_chip sun50i_a100_ths = {
+ .sensor_num = 3,
+ .has_bus_clk_reset = true,
+ .ft_deviation = 8000,
+ .offset = 187744,
+ .scale = 672,
+ .temp_data_base = SUN50I_H6_THS_TEMP_DATA,
+ .init = sun50i_h6_thermal_init,
+ .calc_temp = sun8i_ths_calc_temp,
+};
+
+static const struct ths_thermal_chip sun50i_h5_ths = {
+ .sensor_num = 2,
+ .has_mod_clk = true,
+ .has_bus_clk_reset = true,
+ .temp_data_base = SUN8I_THS_TEMP_DATA,
+ .init = sun8i_h3_thermal_init,
+ .calc_temp = sun50i_h5_calc_temp,
+};
+
+static const struct ths_thermal_chip sun50i_h6_ths = {
+ .sensor_num = 2,
+ .has_bus_clk_reset = true,
+ .ft_deviation = 7000,
+ .offset = 187744,
+ .scale = 672,
+ .temp_data_base = SUN50I_H6_THS_TEMP_DATA,
+ .init = sun50i_h6_thermal_init,
+ .calc_temp = sun8i_ths_calc_temp,
+};
+
+static const struct udevice_id of_ths_match[] = {
+ { .compatible = "allwinner,sun8i-a83t-ths", .data = (ulong)&sun8i_a83t_ths },
+ { .compatible = "allwinner,sun8i-h3-ths", .data = (ulong)&sun8i_h3_ths },
+ { .compatible = "allwinner,sun8i-r40-ths", .data = (ulong)&sun8i_r40_ths },
+ { .compatible = "allwinner,sun50i-a64-ths", .data = (ulong)&sun50i_a64_ths },
+ { .compatible = "allwinner,sun50i-a100-ths", .data = (ulong)&sun50i_a100_ths },
+ { .compatible = "allwinner,sun50i-h5-ths", .data = (ulong)&sun50i_h5_ths },
+ { .compatible = "allwinner,sun50i-h6-ths", .data = (ulong)&sun50i_h6_ths },
+ { /* sentinel */ },
+};
+
+U_BOOT_DRIVER(sun8i_thermal) = {
+ .name = "sun8i_thermal",
+ .id = UCLASS_THERMAL,
+ .ops = &sun8i_ths_ops,
+ .of_match = of_ths_match,
+ .probe = sun8i_ths_probe,
+ .plat_auto = sizeof(struct ths_device),
+ .flags = DM_FLAG_PRE_RELOC,
+};
--
2.17.1
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