[PATCH v4 11/11] thermal: sun8i: add thermal driver for h3

Yangtao Li
2019-06-23T16:42:37Z

This patch adds the support for allwinner h3 thermal sensor.

Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
---
drivers/thermal/sun8i_thermal.c | 72 +++++++++++++++++++++++++++++++++
1 file changed, 72 insertions(+)

diff --git a/drivers/thermal/sun8i_thermal.c b/drivers/thermal/sun8i_thermal.c
index 260b24340f5b..c8ee291f3b17 100644
--- a/drivers/thermal/sun8i_thermal.c
+++ b/drivers/thermal/sun8i_thermal.c
@@ -27,6 +27,14 @@
#define TEMP_TO_REG 672
#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
@@ -36,6 +44,9 @@
#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 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))
@@ -121,6 +132,21 @@ static const struct regmap_config config = {
.fast_io = true,
};

+static int sun8i_h3_irq_ack(struct ths_device *tmdev)
+{
+ int state, ret = 0;
+
+ regmap_read(tmdev->regmap, SUN8I_THS_IS, &state);
+
+ if (state & BIT(8)) {
+ regmap_write(tmdev->regmap, SUN8I_THS_IS,
+ BIT(8));
+ ret |= BIT(1);
+ }
+
+ return ret;
+}
+
static int sun50i_h6_irq_ack(struct ths_device *tmdev)
{
int i, state, ret = 0;
@@ -154,6 +180,14 @@ static irqreturn_t sun8i_irq_thread(int irq, void *data)
return IRQ_HANDLED;
}

+static int sun8i_h3_ths_calibrate(struct ths_device *tmdev,
+ u16 *caldata, int callen)
+{
+ regmap_write(tmdev->regmap, SUN8I_THS_TEMP_CALIB, *caldata);
+
+ return 0;
+}
+
static int sun50i_h6_ths_calibrate(struct ths_device *tmdev,
u16 *caldata, int callen)
{
@@ -325,6 +359,32 @@ static int sun8i_ths_resource_init(struct ths_device *tmdev)
return ret;
}

+static int sun8i_h3_thermal_init(struct ths_device *tmdev)
+{
+ /* average over 4 samples */
+ regmap_write(tmdev->regmap, SUN8I_THS_MFC,
+ SUN50I_THS_FILTER_EN |
+ SUN50I_THS_FILTER_TYPE(1));
+ /*
+ * period = (x + 1) * 4096 / clkin; ~10ms
+ * enable data interrupt
+ */
+ regmap_write(tmdev->regmap, SUN8I_THS_IC,
+ SUN50I_H6_THS_PC_TEMP_PERIOD(58) | BIT(8));
+ /*
+ * clkin = 24MHz
+ * T acquire = clkin / (x + 1)
+ * = 20us
+ * enable sensor
+ */
+ regmap_write(tmdev->regmap, SUN8I_THS_CTRL0,
+ SUN8I_THS_CTRL0_T_ACQ0(479));
+ regmap_write(tmdev->regmap, SUN8I_THS_CTRL2,
+ SUN8I_THS_CTRL2_T_ACQ1(479) | BIT(0));
+
+ return 0;
+}
+
static int sun50i_thermal_init(struct ths_device *tmdev)
{
int val;
@@ -431,6 +491,17 @@ static int sun8i_ths_remove(struct platform_device *pdev)
return 0;
}

+static const struct ths_thermal_chip sun8i_h3_ths = {
+ .sensor_num = 1,
+ .offset = -1794,
+ .scale = -121,
+ .has_ahb_clk = true,
+ .temp_data_base = SUN8I_THS_TEMP_DATA,
+ .calibrate = sun8i_h3_ths_calibrate,
+ .init = sun8i_h3_thermal_init,
+ .irq_ack = sun8i_h3_irq_ack,
+};
+
static const struct ths_thermal_chip sun50i_h6_ths = {
.sensor_num = 2,
.offset = -2794,
@@ -443,6 +514,7 @@ static const struct ths_thermal_chip sun50i_h6_ths = {
};

static const struct of_device_id of_ths_match[] = {
+ { .compatible = "allwinner,sun8i-h3-ths", .data = &sun8i_h3_ths },
{ .compatible = "allwinner,sun50i-h6-ths", .data = &sun50i_h6_ths },
{ /* sentinel */ },
};
--
2.17.1