mmc: zynq_sdhci: Split set_tapdelay function to in and out

Split arasan_zynqmp_set_tapdelay() to handle input and output tapdelays
separately. This is required to handle zero values for ITAP and OTAP
values. If we dont split, we will have to remove the if() in the
function, which makes ITAP values to be overwritten when OTAP values are
called to set and vice-versa.

Restrict tap_delay value calculated to max allowed 8 bits for ITAP and 6
bits for OTAP for ZynqMP.
Signed-off-by: NAshok Reddy Soma <ashok.reddy.soma@xilinx.com>
Reviewed-by: NJaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>

board/xilinx/zynqmp/tap_delays.c

@@ -50,48 +50,51 @@ void zynqmp_dll_reset(u8 deviceid)
 		zynqmp_mmio_write(SD_DLL_CTRL, SD1_DLL_RST_MASK, 0x0);
 }
 
-void arasan_zynqmp_set_tapdelay(u8 deviceid, u32 itap_delay, u32 otap_delay)
+void arasan_zynqmp_set_in_tapdelay(u8 deviceid, u32 itap_delay)
 {
 	if (deviceid == 0) {
-		zynqmp_mmio_write(SD_DLL_CTRL, SD0_DLL_RST_MASK,
-				  SD0_DLL_RST);
-		/* Program ITAP */
-		if (itap_delay) {
-			zynqmp_mmio_write(SD_ITAP_DLY, SD0_ITAPCHGWIN_MASK,
-					  SD0_ITAPCHGWIN);
-			zynqmp_mmio_write(SD_ITAP_DLY, SD0_ITAPDLYENA_MASK,
-					  SD0_ITAPDLYENA);
-			zynqmp_mmio_write(SD_ITAP_DLY, SD0_ITAPDLYSEL_MASK,
-					  itap_delay);
-			zynqmp_mmio_write(SD_ITAP_DLY, SD0_ITAPCHGWIN_MASK,
-					  0x0);
-		}
+		zynqmp_mmio_write(SD_DLL_CTRL, SD0_DLL_RST_MASK, SD0_DLL_RST);
 
-		/* Program OTAP */
-		if (otap_delay)
-			zynqmp_mmio_write(SD_OTAP_DLY, SD0_OTAPDLYSEL_MASK,
-					  otap_delay);
+		/* Program ITAP delay */
+		zynqmp_mmio_write(SD_ITAP_DLY, SD0_ITAPCHGWIN_MASK,
+				  SD0_ITAPCHGWIN);
+		zynqmp_mmio_write(SD_ITAP_DLY, SD0_ITAPDLYENA_MASK,
+				  SD0_ITAPDLYENA);
+		zynqmp_mmio_write(SD_ITAP_DLY, SD0_ITAPDLYSEL_MASK, itap_delay);
+		zynqmp_mmio_write(SD_ITAP_DLY, SD0_ITAPCHGWIN_MASK, 0x0);
 
 		zynqmp_mmio_write(SD_DLL_CTRL, SD0_DLL_RST_MASK, 0x0);
 	} else {
-		zynqmp_mmio_write(SD_DLL_CTRL, SD1_DLL_RST_MASK,
-				  SD1_DLL_RST);
-		/* Program ITAP */
-		if (itap_delay) {
-			zynqmp_mmio_write(SD_ITAP_DLY, SD1_ITAPCHGWIN_MASK,
-					  SD1_ITAPCHGWIN);
-			zynqmp_mmio_write(SD_ITAP_DLY, SD1_ITAPDLYENA_MASK,
-					  SD1_ITAPDLYENA);
-			zynqmp_mmio_write(SD_ITAP_DLY, SD1_ITAPDLYSEL_MASK,
-					  (itap_delay << 16));
-			zynqmp_mmio_write(SD_ITAP_DLY, SD1_ITAPCHGWIN_MASK,
-					  0x0);
-		}
+		zynqmp_mmio_write(SD_DLL_CTRL, SD1_DLL_RST_MASK, SD1_DLL_RST);
+
+		/* Program ITAP delay */
+		zynqmp_mmio_write(SD_ITAP_DLY, SD1_ITAPCHGWIN_MASK,
+				  SD1_ITAPCHGWIN);
+		zynqmp_mmio_write(SD_ITAP_DLY, SD1_ITAPDLYENA_MASK,
+				  SD1_ITAPDLYENA);
+		zynqmp_mmio_write(SD_ITAP_DLY, SD1_ITAPDLYSEL_MASK,
+				  (itap_delay << 16));
+		zynqmp_mmio_write(SD_ITAP_DLY, SD1_ITAPCHGWIN_MASK, 0x0);
+
+		zynqmp_mmio_write(SD_DLL_CTRL, SD1_DLL_RST_MASK, 0x0);
+	}
+}
+
+void arasan_zynqmp_set_out_tapdelay(u8 deviceid, u32 otap_delay)
+{
+	if (deviceid == 0) {
+		zynqmp_mmio_write(SD_DLL_CTRL, SD0_DLL_RST_MASK, SD0_DLL_RST);
+
+		/* Program OTAP delay */
+		zynqmp_mmio_write(SD_OTAP_DLY, SD0_OTAPDLYSEL_MASK, otap_delay);
+
+		zynqmp_mmio_write(SD_DLL_CTRL, SD0_DLL_RST_MASK, 0x0);
+	} else {
+		zynqmp_mmio_write(SD_DLL_CTRL, SD1_DLL_RST_MASK, SD1_DLL_RST);
 
-		/* Program OTAP */
-		if (otap_delay)
-			zynqmp_mmio_write(SD_OTAP_DLY, SD1_OTAPDLYSEL_MASK,
-					  (otap_delay << 16));
+		/* Program OTAP delay */
+		zynqmp_mmio_write(SD_OTAP_DLY, SD1_OTAPDLYSEL_MASK,
+				  (otap_delay << 16));
 
 		zynqmp_mmio_write(SD_DLL_CTRL, SD1_DLL_RST_MASK, 0x0);
 	}

drivers/mmc/zynq_sdhci.c

@@ -226,7 +226,10 @@ static int sdhci_zynqmp_sdcardclk_set_phase(struct sdhci_host *host,
 
 	tap_delay = (degrees * tap_max) / 360;
 
-	arasan_zynqmp_set_tapdelay(priv->deviceid, 0, tap_delay);
+	/* Limit output tap_delay value to 6 bits */
+	tap_delay &= SDHCI_ARASAN_OTAPDLY_SEL_MASK;
+
+	arasan_zynqmp_set_out_tapdelay(priv->deviceid, tap_delay);
 
 	return 0;
 }
@@ -279,7 +282,10 @@ static int sdhci_zynqmp_sampleclk_set_phase(struct sdhci_host *host,
 
 	tap_delay = (degrees * tap_max) / 360;
 
-	arasan_zynqmp_set_tapdelay(priv->deviceid, tap_delay, 0);
+	/* Limit input tap_delay value to 8 bits */
+	tap_delay &= SDHCI_ARASAN_ITAPDLY_SEL_MASK;
+
+	arasan_zynqmp_set_in_tapdelay(priv->deviceid, tap_delay);
 
 	return 0;
 }

include/zynqmp_tap_delay.h

@@ -10,11 +10,12 @@
 
 #ifdef CONFIG_ARCH_ZYNQMP
 void zynqmp_dll_reset(u8 deviceid);
-void arasan_zynqmp_set_tapdelay(u8 device_id, u32 itap_delay, u32 otap_delay);
+void arasan_zynqmp_set_in_tapdelay(u8 device_id, u32 itap_delay);
+void arasan_zynqmp_set_out_tapdelay(u8 device_id, u32 otap_delay);
 #else
 inline void zynqmp_dll_reset(u8 deviceid) {}
-inline void arasan_zynqmp_set_tapdelay(u8 device_id, u32 itap_delay,
-				       u32 otap_delay) {}
+inline void arasan_zynqmp_set_in_tapdelay(u8 device_id, u32 itap_delay) {}
+inline void arasan_zynqmp_set_out_tapdelay(u8 device_id, u32 otap_delay) {}
 #endif
 
 #endif