[PATCH v4 06/12] thermal: armada: Add support for Armada AP806

[Miquel Raynal]

From: Baruch Siach <baruch at tkos.co.il>

The AP806 component is integrated in the Armada 8K and 7K lines of
processors.

The thermal sensor sample field on the status register is a signed
value. Extend armada_get_temp() and the driver structure to handle
signed values.

Signed-off-by: Baruch Siach <baruch at tkos.co.il>
[<miquel.raynal at free-electrons.com>: Changes when applying over the
previous patches, including the register names changes, also switched
the coefficients values to s64 instead of unsigned long to deal with
negative values and used do_div instead of the traditionnal '/']
Signed-off-by: Miquel Raynal <miquel.raynal at free-electrons.com>
---
 drivers/thermal/armada_thermal.c | 80 ++++++++++++++++++++++++++++++++--------
 1 file changed, 65 insertions(+), 15 deletions(-)

diff --git a/drivers/thermal/armada_thermal.c b/drivers/thermal/armada_thermal.c
index 198485fa77f2..ec29ea76b818 100644
--- a/drivers/thermal/armada_thermal.c
+++ b/drivers/thermal/armada_thermal.c
@@ -47,6 +47,11 @@
 #define CONTROL0_OFFSET			0x0
 #define CONTROL1_OFFSET			0x4
 
+/* TSEN refers to the temperature sensors within the AP */
+#define CONTROL0_TSEN_START		BIT(0)
+#define CONTROL0_TSEN_RESET		BIT(1)
+#define CONTROL0_TSEN_ENABLE		BIT(2)
+
 struct armada_thermal_data;
 
 /* Marvell EBU Thermal Sensor Dev Structure */
@@ -66,15 +71,17 @@ struct armada_thermal_data {
 	bool (*is_valid)(struct armada_thermal_priv *);
 
 	/* Formula coeficients: temp = (b - m * reg) / div */
-	unsigned long coef_b;
-	unsigned long coef_m;
-	unsigned long coef_div;
+	s64 coef_b;
+	s64 coef_m;
+	u32 coef_div;
 	bool inverted;
+	bool signed_sample;
 
 	/* Register shift and mask to access the sensor temperature */
 	unsigned int temp_shift;
 	unsigned int temp_mask;
 	u32 is_valid_bit;
+	bool needs_control0;
 };
 
 static void armadaxp_init_sensor(struct platform_device *pdev,
@@ -154,6 +161,18 @@ static void armada380_init_sensor(struct platform_device *pdev,
 	}
 }
 
+static void armada_ap806_init_sensor(struct platform_device *pdev,
+				     struct armada_thermal_priv *priv)
+{
+	u32 reg;
+
+	reg = readl_relaxed(priv->control0);
+	reg &= ~CONTROL0_TSEN_RESET;
+	reg |= CONTROL0_TSEN_START | CONTROL0_TSEN_ENABLE;
+	writel(reg, priv->control0);
+	msleep(10);
+}
+
 static bool armada_is_valid(struct armada_thermal_priv *priv)
 {
 	u32 reg = readl_relaxed(priv->status);
@@ -165,8 +184,8 @@ static int armada_get_temp(struct thermal_zone_device *thermal,
 			  int *temp)
 {
 	struct armada_thermal_priv *priv = thermal->devdata;
-	unsigned long reg;
-	unsigned long m, b, div;
+	u32 reg, div;
+	s64 sample, b, m;
 
 	/* Valid check */
 	if (priv->data->is_valid && !priv->data->is_valid(priv)) {
@@ -177,6 +196,11 @@ static int armada_get_temp(struct thermal_zone_device *thermal,
 
 	reg = readl_relaxed(priv->status);
 	reg = (reg >> priv->data->temp_shift) & priv->data->temp_mask;
+	if (priv->data->signed_sample)
+		/* The most significant bit is the sign bit */
+		sample = sign_extend32(reg, fls(priv->data->temp_mask) - 1);
+	else
+		sample = reg;
 
 	/* Get formula coeficients */
 	b = priv->data->coef_b;
@@ -184,9 +208,12 @@ static int armada_get_temp(struct thermal_zone_device *thermal,
 	div = priv->data->coef_div;
 
 	if (priv->data->inverted)
-		*temp = ((m * reg) - b) / div;
+		*temp = (m * sample) - b;
 	else
-		*temp = (b - (m * reg)) / div;
+		*temp = b - (m * sample);
+
+	do_div(*temp, div);
+
 	return 0;
 }
 
@@ -198,8 +225,8 @@ static const struct armada_thermal_data armadaxp_data = {
 	.init_sensor = armadaxp_init_sensor,
 	.temp_shift = 10,
 	.temp_mask = 0x1ff,
-	.coef_b = 3153000000UL,
-	.coef_m = 10000000UL,
+	.coef_b = 3153000000ULL,
+	.coef_m = 10000000ULL,
 	.coef_div = 13825,
 };
 
@@ -209,8 +236,8 @@ static const struct armada_thermal_data armada370_data = {
 	.is_valid_bit = BIT(9),
 	.temp_shift = 10,
 	.temp_mask = 0x1ff,
-	.coef_b = 3153000000UL,
-	.coef_m = 10000000UL,
+	.coef_b = 3153000000ULL,
+	.coef_m = 10000000ULL,
 	.coef_div = 13825,
 };
 
@@ -220,8 +247,8 @@ static const struct armada_thermal_data armada375_data = {
 	.is_valid_bit = BIT(10),
 	.temp_shift = 0,
 	.temp_mask = 0x1ff,
-	.coef_b = 3171900000UL,
-	.coef_m = 10000000UL,
+	.coef_b = 3171900000ULL,
+	.coef_m = 10000000ULL,
 	.coef_div = 13616,
 };
 
@@ -231,12 +258,26 @@ static const struct armada_thermal_data armada380_data = {
 	.is_valid_bit = BIT(10),
 	.temp_shift = 0,
 	.temp_mask = 0x3ff,
-	.coef_b = 1172499100UL,
-	.coef_m = 2000096UL,
+	.coef_b = 1172499100ULL,
+	.coef_m = 2000096ULL,
 	.coef_div = 4201,
 	.inverted = true,
 };
 
+static const struct armada_thermal_data armada_ap806_data = {
+	.is_valid = armada_is_valid,
+	.init_sensor = armada_ap806_init_sensor,
+	.is_valid_bit = BIT(16),
+	.temp_shift = 0,
+	.temp_mask = 0x3ff,
+	.coef_b = -150000LL,
+	.coef_m = 423ULL,
+	.coef_div = 1,
+	.inverted = true,
+	.signed_sample = true,
+	.needs_control0 = true,
+};
+
 static const struct of_device_id armada_thermal_id_table[] = {
 	{
 		.compatible = "marvell,armadaxp-thermal",
@@ -255,6 +296,10 @@ static const struct of_device_id armada_thermal_id_table[] = {
 		.data       = &armada380_data,
 	},
 	{
+		.compatible = "marvell,armada-ap806-thermal",
+		.data       = &armada_ap806_data,
+	},
+	{
 		/* sentinel */
 	},
 };
@@ -296,6 +341,11 @@ static int armada_thermal_probe(struct platform_device *pdev)
 	 */
 	if (resource_size(res) == LEGACY_CONTROL_MEM_LEN) {
 		/* ->control0 unavailable in this configuration */
+		if (priv->data->needs_control0) {
+			dev_err(&pdev->dev, "No access to control0 register\n");
+			return -EINVAL;
+		}
+
 		priv->control1 = control + LEGACY_CONTROL1_OFFSET;
 	} else {
 		priv->control0 = control + CONTROL0_OFFSET;
-- 
2.11.0