net: ethernet: oa_tc6: add helper function to enable zero align rx frame

Zero align receive frame feature can be enabled to align all receive
ethernet frames data to start at the beginning of any receive data chunk
payload with a start word offset (SWO) of zero. Receive frames may begin
anywhere within the receive data chunk payload when this feature is not
enabled.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Parthiban Veerasooran <Parthiban.Veerasooran@microchip.com>
Link: https://patch.msgid.link/20240909082514.262942-13-Parthiban.Veerasooran@microchip.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/oa_tc6.c b/drivers/net/ethernet/oa_tc6.c
index d3510dc1927329a84c6e8c095cd0f51e02326a90..f9c0dcd965c2e7f4c877ca98f056b168fb099b35 100644 (file)
--- a/drivers/net/ethernet/oa_tc6.c
+++ b/drivers/net/ethernet/oa_tc6.c
@@ -23,6 +23,7 @@
 /* Configuration Register #0 */
 #define OA_TC6_REG_CONFIG0                     0x0004
 #define CONFIG0_SYNC                           BIT(15)
+#define CONFIG0_ZARFE_ENABLE                   BIT(12)
 
 /* Status Register #0 */
 #define OA_TC6_REG_STATUS0                     0x0008
@@ -1163,6 +1164,29 @@ static irqreturn_t oa_tc6_macphy_isr(int irq, void *data)
        return IRQ_HANDLED;
 }
 
+/**
+ * oa_tc6_zero_align_receive_frame_enable - function to enable zero align
+ * receive frame feature.
+ * @tc6: oa_tc6 struct.
+ *
+ * Return: 0 on success otherwise failed.
+ */
+int oa_tc6_zero_align_receive_frame_enable(struct oa_tc6 *tc6)
+{
+       u32 regval;
+       int ret;
+
+       ret = oa_tc6_read_register(tc6, OA_TC6_REG_CONFIG0, &regval);
+       if (ret)
+               return ret;
+
+       /* Set Zero-Align Receive Frame Enable */
+       regval |= CONFIG0_ZARFE_ENABLE;
+
+       return oa_tc6_write_register(tc6, OA_TC6_REG_CONFIG0, regval);
+}
+EXPORT_SYMBOL_GPL(oa_tc6_zero_align_receive_frame_enable);
+
 /**
  * oa_tc6_start_xmit - function for sending the tx skb which consists ethernet
  * frame.

diff --git a/include/linux/oa_tc6.h b/include/linux/oa_tc6.h
index 5c7811ac9cbea4e0694921a561c1cbbe5600a792..15f58e3c56c740d9faf9469664e455c8417e3a34 100644 (file)
--- a/include/linux/oa_tc6.h
+++ b/include/linux/oa_tc6.h
@@ -21,3 +21,4 @@ int oa_tc6_read_register(struct oa_tc6 *tc6, u32 address, u32 *value);
 int oa_tc6_read_registers(struct oa_tc6 *tc6, u32 address, u32 value[],
                          u8 length);
 netdev_tx_t oa_tc6_start_xmit(struct oa_tc6 *tc6, struct sk_buff *skb);
+int oa_tc6_zero_align_receive_frame_enable(struct oa_tc6 *tc6);