thermal: rcar_gen3: Reuse logic to read fuses on Gen3 and Gen4

The hardware calibration is fused on some, but not all, Gen3 and Gen4
boards. The calibrations values are the same on both generations but
located at different register offsets.

Instead of having duplicated logic to read the and store the values
create structure to hold the register parameters and have a common
function do the reading.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20250305174631.4119374-3-niklas.soderlund+renesas@ragnatech.se
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

Author: Niklas Söderlund

drivers/thermal/renesas/rcar_gen3_thermal.c

@@ -67,11 +67,17 @@
 
 struct rcar_gen3_thermal_priv;
 
+struct rcar_gen3_thermal_fuse_info {
+	u32 ptat[3];
+	u32 thcode[3];
+	u32 mask;
+};
+
 struct rcar_thermal_info {
 	int scale;
 	int adj_below;
 	int adj_above;
-	void (*read_fuses)(struct rcar_gen3_thermal_priv *priv);
+	const struct rcar_gen3_thermal_fuse_info *fuses;
 };
 
 struct equation_set_coef {
@@ -253,59 +259,31 @@ static irqreturn_t rcar_gen3_thermal_irq(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
-static void rcar_gen3_thermal_read_fuses_gen3(struct rcar_gen3_thermal_priv *priv)
+static void rcar_gen3_thermal_fetch_fuses(struct rcar_gen3_thermal_priv *priv)
 {
-	unsigned int i;
+	const struct rcar_gen3_thermal_fuse_info *fuses = priv->info->fuses;
 
 	/*
 	 * Set the pseudo calibration points with fused values.
 	 * PTAT is shared between all TSCs but only fused for the first
 	 * TSC while THCODEs are fused for each TSC.
 	 */
-	priv->ptat[0] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN3_PTAT1) &
-		GEN3_FUSE_MASK;
-	priv->ptat[1] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN3_PTAT2) &
-		GEN3_FUSE_MASK;
-	priv->ptat[2] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN3_PTAT3) &
-		GEN3_FUSE_MASK;
-
-	for (i = 0; i < priv->num_tscs; i++) {
+	priv->ptat[0] = rcar_gen3_thermal_read(priv->tscs[0], fuses->ptat[0])
+		& fuses->mask;
+	priv->ptat[1] = rcar_gen3_thermal_read(priv->tscs[0], fuses->ptat[1])
+		& fuses->mask;
+	priv->ptat[2] = rcar_gen3_thermal_read(priv->tscs[0], fuses->ptat[2])
+		& fuses->mask;
+
+	for (unsigned int i = 0; i < priv->num_tscs; i++) {
 		struct rcar_gen3_thermal_tsc *tsc = priv->tscs[i];
 
-		tsc->thcode[0] = rcar_gen3_thermal_read(tsc, REG_GEN3_THCODE1) &
-			GEN3_FUSE_MASK;
-		tsc->thcode[1] = rcar_gen3_thermal_read(tsc, REG_GEN3_THCODE2) &
-			GEN3_FUSE_MASK;
-		tsc->thcode[2] = rcar_gen3_thermal_read(tsc, REG_GEN3_THCODE3) &
-			GEN3_FUSE_MASK;
-	}
-}
-
-static void rcar_gen3_thermal_read_fuses_gen4(struct rcar_gen3_thermal_priv *priv)
-{
-	unsigned int i;
-
-	/*
-	 * Set the pseudo calibration points with fused values.
-	 * PTAT is shared between all TSCs but only fused for the first
-	 * TSC while THCODEs are fused for each TSC.
-	 */
-	priv->ptat[0] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN4_THSFMON16) &
-		GEN4_FUSE_MASK;
-	priv->ptat[1] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN4_THSFMON17) &
-		GEN4_FUSE_MASK;
-	priv->ptat[2] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN4_THSFMON15) &
-		GEN4_FUSE_MASK;
-
-	for (i = 0; i < priv->num_tscs; i++) {
-		struct rcar_gen3_thermal_tsc *tsc = priv->tscs[i];
-
-		tsc->thcode[0] = rcar_gen3_thermal_read(tsc, REG_GEN4_THSFMON01) &
-			GEN4_FUSE_MASK;
-		tsc->thcode[1] = rcar_gen3_thermal_read(tsc, REG_GEN4_THSFMON02) &
-			GEN4_FUSE_MASK;
-		tsc->thcode[2] = rcar_gen3_thermal_read(tsc, REG_GEN4_THSFMON00) &
-			GEN4_FUSE_MASK;
+		tsc->thcode[0] = rcar_gen3_thermal_read(tsc, fuses->thcode[0])
+			& fuses->mask;
+		tsc->thcode[1] = rcar_gen3_thermal_read(tsc, fuses->thcode[1])
+			& fuses->mask;
+		tsc->thcode[2] = rcar_gen3_thermal_read(tsc, fuses->thcode[2])
+			& fuses->mask;
 	}
 }
 
@@ -316,7 +294,7 @@ static bool rcar_gen3_thermal_read_fuses(struct rcar_gen3_thermal_priv *priv)
 
 	/* If fuses are not set, fallback to pseudo values. */
 	thscp = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN3_THSCP);
-	if (!priv->info->read_fuses ||
+	if (!priv->info->fuses ||
 	    (thscp & THSCP_COR_PARA_VLD) != THSCP_COR_PARA_VLD) {
 		/* Default THCODE values in case FUSEs are not set. */
 		static const int thcodes[TSC_MAX_NUM][3] = {
@@ -342,7 +320,8 @@ static bool rcar_gen3_thermal_read_fuses(struct rcar_gen3_thermal_priv *priv)
 		return false;
 	}
 
-	priv->info->read_fuses(priv);
+	rcar_gen3_thermal_fetch_fuses(priv);
+
 	return true;
 }
 
@@ -370,25 +349,37 @@ static void rcar_gen3_thermal_init(struct rcar_gen3_thermal_priv *priv,
 	usleep_range(1000, 2000);
 }
 
+static const struct rcar_gen3_thermal_fuse_info rcar_gen3_thermal_fuse_info_gen3 = {
+	.ptat = { REG_GEN3_PTAT1, REG_GEN3_PTAT2, REG_GEN3_PTAT3 },
+	.thcode = { REG_GEN3_THCODE1, REG_GEN3_THCODE2, REG_GEN3_THCODE3 },
+	.mask = GEN3_FUSE_MASK,
+};
+
+static const struct rcar_gen3_thermal_fuse_info rcar_gen3_thermal_fuse_info_gen4 = {
+	.ptat = { REG_GEN4_THSFMON16, REG_GEN4_THSFMON17, REG_GEN4_THSFMON15 },
+	.thcode = { REG_GEN4_THSFMON01, REG_GEN4_THSFMON02, REG_GEN4_THSFMON00 },
+	.mask = GEN4_FUSE_MASK,
+};
+
 static const struct rcar_thermal_info rcar_m3w_thermal_info = {
 	.scale = 157,
 	.adj_below = -41,
 	.adj_above = 116,
-	.read_fuses = rcar_gen3_thermal_read_fuses_gen3,
+	.fuses = &rcar_gen3_thermal_fuse_info_gen3,
 };
 
 static const struct rcar_thermal_info rcar_gen3_thermal_info = {
 	.scale = 167,
 	.adj_below = -41,
 	.adj_above = 126,
-	.read_fuses = rcar_gen3_thermal_read_fuses_gen3,
+	.fuses = &rcar_gen3_thermal_fuse_info_gen3,
 };
 
 static const struct rcar_thermal_info rcar_gen4_thermal_info = {
 	.scale = 167,
 	.adj_below = -41,
 	.adj_above = 126,
-	.read_fuses = rcar_gen3_thermal_read_fuses_gen4,
+	.fuses = &rcar_gen3_thermal_fuse_info_gen4,
 };
 
 static const struct of_device_id rcar_gen3_thermal_dt_ids[] = {