linux-kernel - [PATCH] net: dsa: b53: add support for BCM63xx RGMIIs

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Date:   Sun, 19 Mar 2023 19:33:30 +0100
From:   Álvaro Fernández Rojas 
        <noltari@...il.com>
To:     f.fainelli@...il.com, jonas.gorski@...il.com, andrew@...n.ch,
        olteanv@...il.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Álvaro Fernández Rojas 
        <noltari@...il.com>
Subject: [PATCH] net: dsa: b53: add support for BCM63xx RGMIIs

BCM63xx RGMII ports require additional configuration in order to work.

Signed-off-by: Álvaro Fernández Rojas <noltari@...il.com>
---
 drivers/net/dsa/b53/b53_common.c | 36 ++++++++++++++++++++++++++++++++
 drivers/net/dsa/b53/b53_priv.h   |  1 +
 2 files changed, 37 insertions(+)

diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
index 59cdfc51ce06..378327add363 100644
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -1209,6 +1209,36 @@ static void b53_force_port_config(struct b53_device *dev, int port,
 	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 == dev->imp_port)
+		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 != dev->imp_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)
 {
@@ -1235,6 +1265,9 @@ static void b53_adjust_link(struct dsa_switch *ds, int port,
 			      tx_pause, rx_pause);
 	b53_force_link(dev, port, phydev->link);
 
+	if (is63xx(dev) && port >= B53_63XX_RGMII0)
+		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;
@@ -1402,6 +1435,9 @@ void b53_phylink_mac_link_up(struct dsa_switch *ds, int port,
 {
 	struct b53_device *dev = ds->priv;
 
+	if (is63xx(dev) && port >= B53_63XX_RGMII0)
+		b53_adjust_63xx_rgmii(ds, port, interface);
+
 	if (mode == MLO_AN_PHY)
 		return;
 
diff --git a/drivers/net/dsa/b53/b53_priv.h b/drivers/net/dsa/b53/b53_priv.h
index 795cbffd5c2b..4cf9f540696e 100644
--- a/drivers/net/dsa/b53/b53_priv.h
+++ b/drivers/net/dsa/b53/b53_priv.h
@@ -211,6 +211,7 @@ static inline int is58xx(struct b53_device *dev)
 		dev->chip_id == BCM7278_DEVICE_ID;
 }
 
+#define B53_63XX_RGMII0	4
 #define B53_CPU_PORT_25	5
 #define B53_CPU_PORT	8
 
-- 
2.30.2