board: milkv_duo: Add init code for Milk-V Duo ethernet

Initialize register in cv1800b ethernet phy to make it compatible with
generic phy driver

Signed-off-by: Kongyang Liu <seashell11234455@gmail.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
diff --git a/board/sophgo/milkv_duo/ethernet.c b/board/sophgo/milkv_duo/ethernet.c
new file mode 100644
index 0000000..e997ce1
--- /dev/null
+++ b/board/sophgo/milkv_duo/ethernet.c
@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2024, Kongyang Liu <seashell11234455@gmail.com>
+ */
+
+#include <linux/io.h>
+#include <linux/bitops.h>
+#include <linux/mii.h>
+
+#define REG_EPHY_TOP_WRAP (u32 *)0x03009800
+#define REG_EPHY_BASE     (u32 *)0x03009000
+
+#define REG_EPHY_CTL         REG_EPHY_TOP_WRAP
+#define REG_EPHY_APB_RW_SEL  REG_EPHY_TOP_WRAP + 1
+
+/* Page 0 register */
+#define REG_PHY_ID1          REG_EPHY_BASE + MII_PHYSID1
+#define REG_PHY_ID2          REG_EPHY_BASE + MII_PHYSID2
+#define REG_PHY_PAGE_SEL     REG_EPHY_BASE + 0x1f
+
+/* Page 5 register */
+#define REG_PD_EN_CTL        REG_EPHY_BASE + 0x10
+
+/* REG_EPHY_CTL */
+#define REG_EPHY_SHUTDOWN    BIT(0)
+#define REG_EPHY_ANA_RST_N   BIT(1)
+#define REG_EPHY_DIG_RST_N   BIT(2)
+#define REG_EPHY_MAIN_RST_N  BIT(3)
+
+/* REG_PD_EN_CTL */
+#define REG_EN_ETH_TXRT          BIT(0)
+#define REG_EN_ETH_CLK100M       BIT(1)
+#define REG_EN_ETH_CLK125M       BIT(2)
+#define REG_EN_ETH_PLL_LCKDET    BIT(3)
+#define REG_EN_ETH_RXADC         BIT(4)
+#define REG_EN_ETH_RXPGA         BIT(5)
+#define REG_EN_ETH_RXRT          BIT(6)
+#define REG_EN_ETH_TXCROSSOVER   BIT(7)
+#define REG_PD_ETH_PLL           BIT(8)
+#define REG_PD_ETH_TXDAC         BIT(9)
+#define REG_PD_ETH_TXDACBST      BIT(10)
+#define REG_PD_ETH_TXECHO        BIT(11)
+#define REG_PD_ETH_TXDRV_NMOS    BIT(12)
+#define REG_PD_ETH_TXLDO         BIT(13)
+
+void cv1800b_ephy_init(void)
+{
+	u32 reg;
+	u32 phy_id = 1;
+
+	/* enable direct memory access for phy register */
+	writel(1, REG_EPHY_APB_RW_SEL);
+
+	reg = readl(REG_EPHY_CTL);
+	reg &= ~REG_EPHY_SHUTDOWN;
+	reg |= REG_EPHY_ANA_RST_N | REG_EPHY_DIG_RST_N | REG_EPHY_MAIN_RST_N;
+	writel(reg, REG_EPHY_CTL);
+
+	/* switch to page 5 */
+	writel(5 << 8, REG_PHY_PAGE_SEL);
+	reg = readl(REG_PD_EN_CTL);
+	reg &= ~(REG_PD_ETH_TXLDO | REG_PD_ETH_TXDRV_NMOS | REG_PD_ETH_TXDAC | REG_PD_ETH_PLL);
+	reg |= REG_EN_ETH_TXRT | REG_EN_ETH_CLK100M | REG_EN_ETH_CLK125M
+		| REG_EN_ETH_PLL_LCKDET | REG_EN_ETH_RXADC | REG_EN_ETH_RXPGA | REG_EN_ETH_RXRT;
+	writel(reg, REG_PD_EN_CTL);
+
+	/* switch to page 0 */
+	writel(0 << 8, REG_PHY_PAGE_SEL);
+	/*
+	 * As the phy_id in the cv1800b PHY register is initialized to 0, it
+	 * is necessary to manually initialize the phy_id to an arbitrary
+	 * value so that it could corresponds to the generic PHY driver.
+	 */
+	writel(phy_id >> 16, REG_PHY_ID1);
+	writel(phy_id & 0xffff, REG_PHY_ID2);
+
+	/* switch to MDIO control */
+	writel(0, REG_EPHY_APB_RW_SEL);
+}