memory: ti-aemif: Create aemif_set_cs_timings()

Create an aemif_set_cs_timings() function to isolate the setting of a
chip select timing configuration and ease its exportation.

Signed-off-by: Bastien Curutchet <bastien.curutchet@bootlin.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20241204094319.1050826-6-bastien.curutchet@bootlin.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

drivers/memory/ti-aemif.c

@@ -69,15 +69,15 @@
 #define ACR_SSTROBE_MASK	BIT(31)
 #define ASIZE_16BIT	1
 
-#define CONFIG_MASK	(TA(TA_MAX) | \
-				RHOLD(RHOLD_MAX) | \
-				RSTROBE(RSTROBE_MAX) |	\
-				RSETUP(RSETUP_MAX) | \
-				WHOLD(WHOLD_MAX) | \
-				WSTROBE(WSTROBE_MAX) | \
-				WSETUP(WSETUP_MAX) | \
-				EW(EW_MAX) | SSTROBE(SSTROBE_MAX) | \
-				ASIZE_MAX)
+#define TIMINGS_MASK	(TA(TA_MAX) | \
+			RHOLD(RHOLD_MAX) | \
+			RSTROBE(RSTROBE_MAX) |	\
+			RSETUP(RSETUP_MAX) | \
+			WHOLD(WHOLD_MAX) | \
+			WSTROBE(WSTROBE_MAX) | \
+			WSETUP(WSETUP_MAX))
+
+#define CONFIG_MASK	(EW(EW_MAX) | SSTROBE(SSTROBE_MAX) | ASIZE_MAX)
 
 /**
  * struct aemif_cs_timings: structure to hold CS timings
@@ -165,6 +165,44 @@ static int aemif_check_cs_timings(struct aemif_cs_timings *timings)
 	return 0;
 }
 
+/**
+ * aemif_set_cs_timings() - Set the timing configuration of a given chip select.
+ * @aemif: aemif device to configure
+ * @cs: index of the chip select to configure
+ * @timings: timings configuration to set
+ *
+ * @return: 0 on success, else negative errno.
+ */
+static int aemif_set_cs_timings(struct aemif_device *aemif, u8 cs, struct aemif_cs_timings *timings)
+{
+	unsigned int offset;
+	u32 val, set;
+	int ret;
+
+	if (!timings || !aemif)
+		return -EINVAL;
+
+	if (cs > aemif->num_cs)
+		return -EINVAL;
+
+	ret = aemif_check_cs_timings(timings);
+	if (ret)
+		return ret;
+
+	set = TA(timings->ta) | RHOLD(timings->rhold) | RSTROBE(timings->rstrobe) |
+	      RSETUP(timings->rsetup) | WHOLD(timings->whold) |
+	      WSTROBE(timings->wstrobe) | WSETUP(timings->wsetup);
+
+	offset = A1CR_OFFSET + cs * 4;
+
+	val = readl(aemif->base + offset);
+	val &= ~TIMINGS_MASK;
+	val |= set;
+	writel(val, aemif->base + offset);
+
+	return 0;
+}
+
 /**
  * aemif_calc_rate - calculate timing data.
  * @pdev: platform device to calculate for
@@ -213,12 +251,7 @@ static int aemif_config_abus(struct platform_device *pdev, int csnum)
 
 	offset = A1CR_OFFSET + (data->cs - aemif->cs_offset) * 4;
 
-	set = TA(data->timings.ta) |
-		RHOLD(data->timings.rhold) | RSTROBE(data->timings.rstrobe) |
-		RSETUP(data->timings.rsetup) | WHOLD(data->timings.whold) |
-		WSTROBE(data->timings.wstrobe) | WSETUP(data->timings.wsetup);
-
-	set |= (data->asize & ACR_ASIZE_MASK);
+	set = (data->asize & ACR_ASIZE_MASK);
 	if (data->enable_ew)
 		set |= ACR_EW_MASK;
 	if (data->enable_ss)
@@ -229,7 +262,7 @@ static int aemif_config_abus(struct platform_device *pdev, int csnum)
 	val |= set;
 	writel(val, aemif->base + offset);
 
-	return 0;
+	return aemif_set_cs_timings(aemif, data->cs - aemif->cs_offset, &data->timings);
 }
 
 /**