1 files changed, 66 insertions, 4 deletions

diff --git a/target/linux/realtek/files-5.4/drivers/net/dsa/rtl83xx/rtl839x.c b/target/linux/realtek/files-5.4/drivers/net/dsa/rtl83xx/rtl839x.c
index b9fdd2c955..b2846deb11 100644
--- a/target/linux/realtek/files-5.4/drivers/net/dsa/rtl83xx/rtl839x.c
+++ b/target/linux/realtek/files-5.4/drivers/net/dsa/rtl83xx/rtl839x.c
@@ -321,6 +321,7 @@ int rtl8390_sds_power(int mac, int val)
 	return 0;
 }
 
+
 int rtl839x_read_phy(u32 port, u32 page, u32 reg, u32 *val)
 {
 	u32 v;
@@ -358,10 +359,9 @@ int rtl839x_write_phy(u32 port, u32 page, u32 reg, u32 val)
 		return -ENOTSUPP;
 
 	mutex_lock(&smi_lock);
-	/* Clear both port registers */
-	sw_w32(0, RTL839X_PHYREG_PORT_CTRL(0));
-	sw_w32(0, RTL839X_PHYREG_PORT_CTRL(0) + 4);
-	sw_w32_mask(0, BIT(port), RTL839X_PHYREG_PORT_CTRL(port));
+
+	// Set PHY to access
+	rtl839x_set_port_reg_le(BIT_ULL(port), RTL839X_PHYREG_PORT_CTRL);
 
 	sw_w32_mask(0xffff0000, val << 16, RTL839X_PHYREG_DATA_CTRL);
 
@@ -383,6 +383,68 @@ int rtl839x_write_phy(u32 port, u32 page, u32 reg, u32 val)
 	return err;
 }
 
+/*
+ * Read an mmd register of the PHY
+ */
+int rtl839x_read_mmd_phy(u32 port, u32 devnum, u32 regnum, u32 *val)
+{
+	int err = 0;
+	u32 v;
+
+	mutex_lock(&smi_lock);
+
+	// Set PHY to access
+	sw_w32_mask(0xffff << 16, port << 16, RTL839X_PHYREG_DATA_CTRL);
+
+	// Set MMD device number and register to write to
+	sw_w32(devnum << 16 | (regnum & 0xffff), RTL839X_PHYREG_MMD_CTRL);
+
+	v = BIT(2) | BIT(0); // MMD-access | EXEC
+	sw_w32(v, RTL839X_PHYREG_ACCESS_CTRL);
+
+	do {
+		v = sw_r32(RTL839X_PHYREG_ACCESS_CTRL);
+	} while (v & BIT(0));
+	// There is no error-checking via BIT 1 of v, as it does not seem to be set correctly
+	*val = (sw_r32(RTL839X_PHYREG_DATA_CTRL) & 0xffff);
+	pr_debug("%s: port %d, regnum: %x, val: %x (err %d)\n", __func__, port, regnum, *val, err);
+
+	mutex_unlock(&smi_lock);
+
+	return err;
+}
+
+/*
+ * Write to an mmd register of the PHY
+ */
+int rtl839x_write_mmd_phy(u32 port, u32 devnum, u32 regnum, u32 val)
+{
+	int err = 0;
+	u32 v;
+
+	mutex_lock(&smi_lock);
+
+	// Set PHY to access
+	rtl839x_set_port_reg_le(BIT_ULL(port), RTL839X_PHYREG_PORT_CTRL);
+
+	// Set data to write
+	sw_w32_mask(0xffff << 16, val << 16, RTL839X_PHYREG_DATA_CTRL);
+
+	// Set MMD device number and register to write to
+	sw_w32(devnum << 16 | (regnum & 0xffff), RTL839X_PHYREG_MMD_CTRL);
+
+	v = BIT(3) | BIT(2) | BIT(0); // WRITE | MMD-access | EXEC
+	sw_w32(v, RTL839X_PHYREG_ACCESS_CTRL);
+
+	do {
+		v = sw_r32(RTL839X_PHYREG_ACCESS_CTRL);
+	} while (v & BIT(0));
+
+	pr_debug("%s: port %d, regnum: %x, val: %x (err %d)\n", __func__, port, regnum, val, err);
+	mutex_unlock(&smi_lock);
+	return err;
+}
+
 void rtl8390_get_version(struct rtl838x_switch_priv *priv)
 {
 	u32 info;