[net-next RFC PATCH v5 10/10] net: airoha: add phylink support for GDM2/3/4

Christian Marangi
2026-05-05T18:27:47Z

Add phylink support for GDM2/3/4 port that require configuration of the
PCS to make the external PHY or attached SFP cage work.

These needs to be defined in the GDM port node using the pcs-handle
property.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
drivers/net/ethernet/airoha/Kconfig | 1 +
drivers/net/ethernet/airoha/airoha_eth.c | 144 +++++++++++++++++++++-
drivers/net/ethernet/airoha/airoha_eth.h | 3 +
drivers/net/ethernet/airoha/airoha_regs.h | 12 ++
4 files changed, 159 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/airoha/Kconfig b/drivers/net/ethernet/airoha/Kconfig
index ad3ce501e7a5..38dcc76e5998 100644
--- a/drivers/net/ethernet/airoha/Kconfig
+++ b/drivers/net/ethernet/airoha/Kconfig
@@ -20,6 +20,7 @@ config NET_AIROHA
depends on NET_DSA || !NET_DSA
select NET_AIROHA_NPU
select PAGE_POOL
+ select PHYLINK
help
This driver supports the gigabit ethernet MACs in the
Airoha SoC family.
diff --git a/drivers/net/ethernet/airoha/airoha_eth.c b/drivers/net/ethernet/airoha/airoha_eth.c
index 2bd79da70934..ad0328a25422 100644
--- a/drivers/net/ethernet/airoha/airoha_eth.c
+++ b/drivers/net/ethernet/airoha/airoha_eth.c
@@ -8,6 +8,7 @@
#include <linux/of_reserved_mem.h>
#include <linux/platform_device.h>
#include <linux/tcp.h>
+#include <linux/pcs/pcs.h>
#include <linux/u64_stats_sync.h>
#include <net/dst_metadata.h>
#include <net/page_pool/helpers.h>
@@ -71,6 +72,11 @@ static void airoha_qdma_irq_disable(struct airoha_irq_bank *irq_bank,
airoha_qdma_set_irqmask(irq_bank, index, mask, 0);
}

+static bool airhoa_is_phy_external(struct airoha_gdm_port *port)
+{
+ return port->id != 1;
+}
+
static void airoha_set_macaddr(struct airoha_gdm_port *port, const u8 *addr)
{
struct airoha_eth *eth = port->qdma->eth;
@@ -1644,6 +1650,17 @@ static int airoha_dev_open(struct net_device *dev)
struct airoha_qdma *qdma = port->qdma;
u32 pse_port = FE_PSE_PORT_PPE1;

+ if (airhoa_is_phy_external(port)) {
+ err = phylink_of_phy_connect(port->phylink, dev->dev.of_node, 0);
+ if (err) {
+ netdev_err(dev, "%s: could not attach PHY: %d\n", __func__,
+ err);
+ return err;
+ }
+
+ phylink_start(port->phylink);
+ }
+
netif_tx_start_all_queues(dev);
err = airoha_set_vip_for_gdm_port(port, true);
if (err)
@@ -1707,6 +1724,11 @@ static int airoha_dev_stop(struct net_device *dev)
}
}

+ if (airhoa_is_phy_external(port)) {
+ phylink_stop(port->phylink);
+ phylink_disconnect_phy(port->phylink);
+ }
+
return 0;
}

@@ -2883,6 +2905,115 @@ bool airoha_is_valid_gdm_port(struct airoha_eth *eth,
return false;
}

+static void airoha_mac_link_up(struct phylink_config *config, struct phy_device *phy,
+ unsigned int mode, phy_interface_t interface,
+ int speed, int duplex, bool tx_pause, bool rx_pause)
+{
+ struct airoha_gdm_port *port = container_of(config, struct airoha_gdm_port,
+ phylink_config);
+ struct airoha_qdma *qdma = port->qdma;
+ struct airoha_eth *eth = qdma->eth;
+ u32 frag_size_tx, frag_size_rx;
+
+ if (port->id != 4)
+ return;
+
+ switch (speed) {
+ case SPEED_10000:
+ case SPEED_5000:
+ frag_size_tx = 8;
+ frag_size_rx = 8;
+ break;
+ case SPEED_2500:
+ frag_size_tx = 2;
+ frag_size_rx = 1;
+ break;
+ default:
+ frag_size_tx = 1;
+ frag_size_rx = 0;
+ }
+
+ /* Configure TX/RX frag based on speed */
+ airoha_fe_rmw(eth, REG_GDMA4_TMBI_FRAG,
+ GDMA4_SGMII0_TX_FRAG_SIZE_MASK,
+ FIELD_PREP(GDMA4_SGMII0_TX_FRAG_SIZE_MASK,
+ frag_size_tx));
+
+ airoha_fe_rmw(eth, REG_GDMA4_RMBI_FRAG,
+ GDMA4_SGMII0_RX_FRAG_SIZE_MASK,
+ FIELD_PREP(GDMA4_SGMII0_RX_FRAG_SIZE_MASK,
+ frag_size_rx));
+}
+
+static const struct phylink_mac_ops airoha_phylink_ops = {
+ .mac_link_up = airoha_mac_link_up,
+};
+
+static int airoha_setup_phylink(struct net_device *dev)
+{
+ struct airoha_gdm_port *port = netdev_priv(dev);
+ struct device_node *np = dev->dev.of_node;
+ struct phylink_pcs **available_pcs;
+ phy_interface_t phy_mode;
+ struct phylink *phylink;
+ unsigned int num_pcs;
+ int err;
+
+ err = of_get_phy_mode(np, &phy_mode);
+ if (err) {
+ dev_err(&dev->dev, "incorrect phy-mode\n");
+ return err;
+ }
+
+ port->phylink_config.dev = &dev->dev;
+ port->phylink_config.type = PHYLINK_NETDEV;
+ port->phylink_config.mac_capabilities = MAC_ASYM_PAUSE | MAC_SYM_PAUSE |
+ MAC_10 | MAC_100 | MAC_1000 | MAC_2500FD |
+ MAC_5000FD | MAC_10000FD;
+
+ err = fwnode_phylink_pcs_parse(dev_fwnode(&dev->dev), NULL, &num_pcs);
+ if (err)
+ return err;
+
+ available_pcs = kcalloc(num_pcs, sizeof(*available_pcs), GFP_KERNEL);
+ if (!available_pcs)
+ return -ENOMEM;
+
+ err = fwnode_phylink_pcs_parse(dev_fwnode(&dev->dev), available_pcs,
+ &num_pcs);
+ if (err)
+ goto out;
+
+ port->phylink_config.available_pcs = available_pcs;
+ port->phylink_config.num_available_pcs = num_pcs;
+
+ __set_bit(PHY_INTERFACE_MODE_SGMII,
+ port->phylink_config.supported_interfaces);
+ __set_bit(PHY_INTERFACE_MODE_1000BASEX,
+ port->phylink_config.supported_interfaces);
+ __set_bit(PHY_INTERFACE_MODE_2500BASEX,
+ port->phylink_config.supported_interfaces);
+ __set_bit(PHY_INTERFACE_MODE_USXGMII,
+ port->phylink_config.supported_interfaces);
+
+ phy_interface_copy(port->phylink_config.pcs_interfaces,
+ port->phylink_config.supported_interfaces);
+
+ phylink = phylink_create(&port->phylink_config,
+ of_fwnode_handle(np),
+ phy_mode, &airoha_phylink_ops);
+ if (IS_ERR(phylink)) {
+ err = PTR_ERR(phylink);
+ goto out;
+ }
+
+ port->phylink = phylink;
+out:
+ kfree(available_pcs);
+
+ return err;
+}
+
static int airoha_alloc_gdm_port(struct airoha_eth *eth,
struct device_node *np)
{
@@ -2954,6 +3085,12 @@ static int airoha_alloc_gdm_port(struct airoha_eth *eth,
port->id = id;
eth->ports[p] = port;

+ if (airhoa_is_phy_external(port)) {
+ err = airoha_setup_phylink(dev);
+ if (err)
+ return err;
+ }
+
return airoha_metadata_dst_alloc(port);
}

@@ -3081,8 +3218,11 @@ static int airoha_probe(struct platform_device *pdev)
if (!port)
continue;

- if (port->dev->reg_state == NETREG_REGISTERED)
+ if (port->dev->reg_state == NETREG_REGISTERED) {
+ if (airhoa_is_phy_external(port))
+ phylink_destroy(port->phylink);
unregister_netdev(port->dev);
+ }
airoha_metadata_dst_free(port);
}
airoha_hw_cleanup(eth);
@@ -3107,6 +3247,8 @@ static void airoha_remove(struct platform_device *pdev)
if (!port)
continue;

+ if (airhoa_is_phy_external(port))
+ phylink_destroy(port->phylink);
unregister_netdev(port->dev);
airoha_metadata_dst_free(port);
}
diff --git a/drivers/net/ethernet/airoha/airoha_eth.h b/drivers/net/ethernet/airoha/airoha_eth.h
index af29fc74165b..e5c70f1fa4f1 100644
--- a/drivers/net/ethernet/airoha/airoha_eth.h
+++ b/drivers/net/ethernet/airoha/airoha_eth.h
@@ -538,6 +538,9 @@ struct airoha_gdm_port {
struct net_device *dev;
int id;

+ struct phylink *phylink;
+ struct phylink_config phylink_config;
+
struct airoha_hw_stats stats;

DECLARE_BITMAP(qos_sq_bmap, AIROHA_NUM_QOS_CHANNELS);
diff --git a/drivers/net/ethernet/airoha/airoha_regs.h b/drivers/net/ethernet/airoha/airoha_regs.h
index 436f3c8779c1..27f2583e143a 100644
--- a/drivers/net/ethernet/airoha/airoha_regs.h
+++ b/drivers/net/ethernet/airoha/airoha_regs.h
@@ -358,6 +358,18 @@
#define IP_FRAGMENT_PORT_MASK GENMASK(8, 5)
#define IP_FRAGMENT_NBQ_MASK GENMASK(4, 0)

+#define REG_GDMA4_TMBI_FRAG 0x2028
+#define GDMA4_SGMII1_TX_WEIGHT_MASK GENMASK(31, 26)
+#define GDMA4_SGMII1_TX_FRAG_SIZE_MASK GENMASK(25, 16)
+#define GDMA4_SGMII0_TX_WEIGHT_MASK GENMASK(15, 10)
+#define GDMA4_SGMII0_TX_FRAG_SIZE_MASK GENMASK(9, 0)
+
+#define REG_GDMA4_RMBI_FRAG 0x202c
+#define GDMA4_SGMII1_RX_WEIGHT_MASK GENMASK(31, 26)
+#define GDMA4_SGMII1_RX_FRAG_SIZE_MASK GENMASK(25, 16)
+#define GDMA4_SGMII0_RX_WEIGHT_MASK GENMASK(15, 10)
+#define GDMA4_SGMII0_RX_FRAG_SIZE_MASK GENMASK(9, 0)
+
#define REG_MC_VLAN_EN 0x2100
#define MC_VLAN_EN_MASK BIT(0)

--
2.53.0