From 32cf73d8c6485b7b97aca7e377a68436d09b7022 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= <noltari@gmail.com>
Date: Sun, 14 Mar 2021 20:03:44 +0100
Subject: [PATCH] net: dsa: b53: add support for BCM63xx RGMIIs
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Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
---
 drivers/net/dsa/b53/b53_common.c | 37 ++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -1174,6 +1174,36 @@ static void b53_force_port_config(struct
 	b53_write8(dev, B53_CTRL_PAGE, off, reg);
 }
 
+static void b53_adjust_63xx_rgmii(struct dsa_switch *ds, int port,
+				  phy_interface_t interface)
+{
+	struct b53_device *dev = ds->priv;
+	u8 rgmii_ctrl = 0, off;
+
+	if (port == 8)
+		off = B53_RGMII_CTRL_IMP;
+	else
+		off = B53_RGMII_CTRL_P(port);
+
+	b53_read8(dev, B53_CTRL_PAGE, off, &rgmii_ctrl);
+
+	rgmii_ctrl &= ~(RGMII_CTRL_DLL_RXC | RGMII_CTRL_DLL_TXC);
+	if (interface == PHY_INTERFACE_MODE_RGMII_ID)
+		rgmii_ctrl |= (RGMII_CTRL_DLL_RXC | RGMII_CTRL_DLL_TXC);
+	else if (interface == PHY_INTERFACE_MODE_RGMII_RXID)
+		rgmii_ctrl |= RGMII_CTRL_DLL_RXC;
+	else if (interface == PHY_INTERFACE_MODE_RGMII_TXID)
+		rgmii_ctrl |= RGMII_CTRL_DLL_TXC;
+
+	if (port != B53_CPU_PORT)
+		rgmii_ctrl |= RGMII_CTRL_ENABLE_GMII;
+
+	b53_write8(dev, B53_CTRL_PAGE, off, rgmii_ctrl);
+
+	dev_info(ds->dev, "Configured port %d for %s\n", port,
+		 phy_modes(interface));
+}
+
 static void b53_adjust_link(struct dsa_switch *ds, int port,
 			    struct phy_device *phydev)
 {
@@ -1200,6 +1230,9 @@ static void b53_adjust_link(struct dsa_s
 			      tx_pause, rx_pause);
 	b53_force_link(dev, port, phydev->link);
 
+	if (is63xx(dev))
+		b53_adjust_63xx_rgmii(ds, port, phydev->interface);
+
 	if (is531x5(dev) && phy_interface_is_rgmii(phydev)) {
 		if (port == dev->imp_port)
 			off = B53_RGMII_CTRL_IMP;
@@ -1386,6 +1419,9 @@ void b53_phylink_mac_link_up(struct dsa_
 {
 	struct b53_device *dev = ds->priv;
 
+	if (is63xx(dev) && port >= 4)
+		b53_adjust_63xx_rgmii(ds, port, interface);
+
 	if (mode == MLO_AN_PHY)
 		return;
 
