net: ethernet: mtk_eth_soc: introduce mtk_hw_reset utility routine

This is a preliminary patch to add Wireless Ethernet Dispatcher reset
support.

Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Tested-by: Daniel Golle <daniel@makrotopia.org>
Co-developed-by: Sujuan Chen <sujuan.chen@mediatek.com>
Signed-off-by: Sujuan Chen <sujuan.chen@mediatek.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/ethernet/mediatek/mtk_eth_soc.c

@@ -3517,6 +3517,27 @@ static void mtk_set_mcr_max_rx(struct mtk_mac *mac, u32 val)
 		mtk_w32(mac->hw, mcr_new, MTK_MAC_MCR(mac->id));
 }
 
+static void mtk_hw_reset(struct mtk_eth *eth)
+{
+	u32 val;
+
+	if (MTK_HAS_CAPS(eth->soc->caps, MTK_NETSYS_V2)) {
+		regmap_write(eth->ethsys, ETHSYS_FE_RST_CHK_IDLE_EN, 0);
+		val = RSTCTRL_PPE0_V2;
+	} else {
+		val = RSTCTRL_PPE0;
+	}
+
+	if (MTK_HAS_CAPS(eth->soc->caps, MTK_RSTCTRL_PPE1))
+		val |= RSTCTRL_PPE1;
+
+	ethsys_reset(eth, RSTCTRL_ETH | RSTCTRL_FE | val);
+
+	if (MTK_HAS_CAPS(eth->soc->caps, MTK_NETSYS_V2))
+		regmap_write(eth->ethsys, ETHSYS_FE_RST_CHK_IDLE_EN,
+			     0x3ffffff);
+}
+
 static int mtk_hw_init(struct mtk_eth *eth)
 {
 	u32 dma_mask = ETHSYS_DMA_AG_MAP_PDMA | ETHSYS_DMA_AG_MAP_QDMA |
@@ -3556,22 +3577,9 @@ static int mtk_hw_init(struct mtk_eth *eth)
 		return 0;
 	}
 
-	if (MTK_HAS_CAPS(eth->soc->caps, MTK_NETSYS_V2)) {
-		regmap_write(eth->ethsys, ETHSYS_FE_RST_CHK_IDLE_EN, 0);
-		val = RSTCTRL_PPE0_V2;
-	} else {
-		val = RSTCTRL_PPE0;
-	}
-
-	if (MTK_HAS_CAPS(eth->soc->caps, MTK_RSTCTRL_PPE1))
-		val |= RSTCTRL_PPE1;
-
-	ethsys_reset(eth, RSTCTRL_ETH | RSTCTRL_FE | val);
+	mtk_hw_reset(eth);
 
 	if (MTK_HAS_CAPS(eth->soc->caps, MTK_NETSYS_V2)) {
-		regmap_write(eth->ethsys, ETHSYS_FE_RST_CHK_IDLE_EN,
-			     0x3ffffff);
-
 		/* Set FE to PDMAv2 if necessary */
 		val = mtk_r32(eth, MTK_FE_GLO_MISC);
 		mtk_w32(eth,  val | BIT(4), MTK_FE_GLO_MISC);