[RFC PATCH net-next v2 11/11] net: airoha: add phylink support for GDM2/3/4

Christian Marangi
2025-04-06T22:15:17Z

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/airoha_eth.c | 266 +++++++++++++++++++++-
drivers/net/ethernet/airoha/airoha_eth.h | 4 +
drivers/net/ethernet/airoha/airoha_regs.h | 12 +
include/linux/pcs/pcs-airoha.h | 15 ++
4 files changed, 296 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/airoha/airoha_eth.c b/drivers/net/ethernet/airoha/airoha_eth.c
index c0a642568ac1..40d5d7cb1410 100644
--- a/drivers/net/ethernet/airoha/airoha_eth.c
+++ b/drivers/net/ethernet/airoha/airoha_eth.c
@@ -5,9 +5,13 @@
*/
#include <linux/of.h>
#include <linux/of_net.h>
+#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/tcp.h>
+#include <linux/pcs/pcs.h>
+#include <linux/pcs/pcs-airoha.h>
#include <linux/u64_stats_sync.h>
+#include <linux/regmap.h>
#include <net/dst_metadata.h>
#include <net/page_pool/helpers.h>
#include <net/pkt_cls.h>
@@ -76,6 +80,11 @@ static bool airhoa_is_lan_gdm_port(struct airoha_gdm_port *port)
return port->id == 1;
}

+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;
@@ -1535,6 +1544,17 @@ static int airoha_dev_open(struct net_device *dev)
struct airoha_gdm_port *port = netdev_priv(dev);
struct airoha_qdma *qdma = port->qdma;

+ 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)
@@ -1587,19 +1607,36 @@ 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;
}

static int airoha_dev_set_macaddr(struct net_device *dev, void *p)
{
struct airoha_gdm_port *port = netdev_priv(dev);
+ const u8 *mac_addr = dev->dev_addr;
int err;

err = eth_mac_addr(dev, p);
if (err)
return err;

- airoha_set_macaddr(port, dev->dev_addr);
+ airoha_set_macaddr(port, mac_addr);
+
+ /* Update XFI mac address */
+ if (airhoa_is_phy_external(port)) {
+ regmap_write(port->xfi_mac, AIROHA_PCS_XFI_MAC_XFI_MACADDRL,
+ FIELD_PREP(AIROHA_PCS_XFI_MAC_MACADDRL,
+ mac_addr[0] << 24 | mac_addr[1] << 16 |
+ mac_addr[2] << 8 | mac_addr[3]));
+ regmap_write(port->xfi_mac, AIROHA_PCS_XFI_MAC_XFI_MACADDRH,
+ FIELD_PREP(AIROHA_PCS_XFI_MAC_MACADDRH,
+ mac_addr[4] << 8 | mac_addr[5]));
+ }

return 0;
}
@@ -2454,6 +2491,210 @@ static void airoha_metadata_dst_free(struct airoha_gdm_port *port)
}
}

+static void airoha_mac_config(struct phylink_config *config, unsigned int mode,
+ const struct phylink_link_state *state)
+{
+ struct airoha_gdm_port *port = container_of(config, struct airoha_gdm_port,
+ phylink_config);
+
+ /* Frag disable */
+ regmap_update_bits(port->xfi_mac, AIROHA_PCS_XFI_MAC_XFI_GIB_CFG,
+ AIROHA_PCS_XFI_RX_FRAG_LEN,
+ FIELD_PREP(AIROHA_PCS_XFI_RX_FRAG_LEN, 31));
+ regmap_update_bits(port->xfi_mac, AIROHA_PCS_XFI_MAC_XFI_GIB_CFG,
+ AIROHA_PCS_XFI_TX_FRAG_LEN,
+ FIELD_PREP(AIROHA_PCS_XFI_TX_FRAG_LEN, 31));
+
+ /* IPG NUM */
+ regmap_update_bits(port->xfi_mac, AIROHA_PCS_XFI_MAC_XFI_GIB_CFG,
+ AIROHA_PCS_XFI_IPG_NUM,
+ FIELD_PREP(AIROHA_PCS_XFI_IPG_NUM, 10));
+
+ /* Enable TX/RX flow control */
+ regmap_set_bits(port->xfi_mac, AIROHA_PCS_XFI_MAC_XFI_GIB_CFG,
+ AIROHA_PCS_XFI_TX_FC_EN);
+ regmap_set_bits(port->xfi_mac, AIROHA_PCS_XFI_MAC_XFI_GIB_CFG,
+ AIROHA_PCS_XFI_RX_FC_EN);
+}
+
+static int airoha_mac_prepare(struct phylink_config *config, unsigned int mode,
+ phy_interface_t iface)
+{
+ struct airoha_gdm_port *port = container_of(config, struct airoha_gdm_port,
+ phylink_config);
+
+ /* MPI MBI disable */
+ regmap_set_bits(port->xfi_mac, AIROHA_PCS_XFI_MAC_XFI_GIB_CFG,
+ AIROHA_PCS_XFI_RXMPI_STOP |
+ AIROHA_PCS_XFI_RXMBI_STOP |
+ AIROHA_PCS_XFI_TXMPI_STOP |
+ AIROHA_PCS_XFI_TXMBI_STOP);
+
+ /* Write 1 to trigger reset and clear */
+ regmap_clear_bits(port->xfi_mac, AIROHA_PCS_XFI_MAC_XFI_LOGIC_RST,
+ AIROHA_PCS_XFI_MAC_LOGIC_RST);
+ regmap_set_bits(port->xfi_mac, AIROHA_PCS_XFI_MAC_XFI_LOGIC_RST,
+ AIROHA_PCS_XFI_MAC_LOGIC_RST);
+
+ usleep_range(1000, 2000);
+
+ /* Clear XFI MAC counter */
+ regmap_set_bits(port->xfi_mac, AIROHA_PCS_XFI_MAC_XFI_CNT_CLR,
+ AIROHA_PCS_XFI_GLB_CNT_CLR);
+
+ return 0;
+}
+
+static void airoha_mac_link_down(struct phylink_config *config, unsigned int mode,
+ phy_interface_t interface)
+{
+ struct airoha_gdm_port *port = container_of(config, struct airoha_gdm_port,
+ phylink_config);
+
+ /* MPI MBI disable */
+ regmap_set_bits(port->xfi_mac, AIROHA_PCS_XFI_MAC_XFI_GIB_CFG,
+ AIROHA_PCS_XFI_RXMPI_STOP |
+ AIROHA_PCS_XFI_RXMBI_STOP |
+ AIROHA_PCS_XFI_TXMPI_STOP |
+ AIROHA_PCS_XFI_TXMBI_STOP);
+}
+
+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;
+
+ 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 */
+ if (port->id == 4) {
+ airoha_fe_rmw(eth, REG_GDMA4_TMBI_FRAG, GDMA4_SGMII0_TX_FRAG_SIZE,
+ FIELD_PREP(GDMA4_SGMII0_TX_FRAG_SIZE, frag_size_tx));
+
+ airoha_fe_rmw(eth, REG_GDMA4_RMBI_FRAG, GDMA4_SGMII0_RX_FRAG_SIZE,
+ FIELD_PREP(GDMA4_SGMII0_RX_FRAG_SIZE, frag_size_rx));
+ }
+
+ /* BPI BMI enable */
+ regmap_clear_bits(port->xfi_mac, AIROHA_PCS_XFI_MAC_XFI_GIB_CFG,
+ AIROHA_PCS_XFI_RXMPI_STOP |
+ AIROHA_PCS_XFI_RXMBI_STOP |
+ AIROHA_PCS_XFI_TXMPI_STOP |
+ AIROHA_PCS_XFI_TXMBI_STOP);
+}
+
+static const struct phylink_mac_ops airoha_phylink_ops = {
+ .mac_config = airoha_mac_config,
+ .mac_prepare = airoha_mac_prepare,
+ .mac_link_down = airoha_mac_link_down,
+ .mac_link_up = airoha_mac_link_up,
+};
+
+static int airoha_setup_phylink(struct net_device *dev)
+{
+ struct device_node *pcs_np, *np = dev->dev.of_node;
+ struct airoha_gdm_port *port = netdev_priv(dev);
+ struct phylink_pcs **available_pcs;
+ struct platform_device *pdev;
+ 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;
+ }
+
+ pcs_np = of_parse_phandle(np, "pcs-handle", 0);
+ if (!pcs_np)
+ return -ENODEV;
+
+ if (!of_device_is_available(pcs_np)) {
+ of_node_put(pcs_np);
+ return -ENODEV;
+ }
+
+ pdev = of_find_device_by_node(pcs_np);
+ of_node_put(pcs_np);
+ if (!pdev || !platform_get_drvdata(pdev)) {
+ if (pdev)
+ put_device(&pdev->dev);
+ return -EPROBE_DEFER;
+ }
+
+ port->xfi_mac = dev_get_regmap(&pdev->dev, "xfi_mac");
+ if (IS_ERR(port->xfi_mac))
+ return PTR_ERR(port->xfi_mac);
+
+ 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, int index)
{
@@ -2532,6 +2773,23 @@ static int airoha_alloc_gdm_port(struct airoha_eth *eth,
if (err)
return err;

+ if (airhoa_is_phy_external(port)) {
+ const u8 *mac_addr = dev->dev_addr;
+
+ err = airoha_setup_phylink(dev);
+ if (err)
+ return err;
+
+ /* Setup XFI mac address */
+ regmap_write(port->xfi_mac, AIROHA_PCS_XFI_MAC_XFI_MACADDRL,
+ FIELD_PREP(AIROHA_PCS_XFI_MAC_MACADDRL,
+ mac_addr[0] << 24 | mac_addr[1] << 16 |
+ mac_addr[2] << 8 | mac_addr[3]));
+ regmap_write(port->xfi_mac, AIROHA_PCS_XFI_MAC_XFI_MACADDRH,
+ FIELD_PREP(AIROHA_PCS_XFI_MAC_MACADDRH,
+ mac_addr[4] << 8 | mac_addr[5]));
+ }
+
return register_netdev(dev);
}

@@ -2626,6 +2884,9 @@ static int airoha_probe(struct platform_device *pdev)
struct airoha_gdm_port *port = eth->ports[i];

if (port && 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);
}
@@ -2653,6 +2914,9 @@ static void airoha_remove(struct platform_device *pdev)
continue;

airoha_dev_stop(port->dev);
+ 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 60690b685710..bc0cbeb6bd6d 100644
--- a/drivers/net/ethernet/airoha/airoha_eth.h
+++ b/drivers/net/ethernet/airoha/airoha_eth.h
@@ -460,6 +460,10 @@ struct airoha_gdm_port {
struct net_device *dev;
int id;

+ struct phylink *phylink;
+ struct phylink_config phylink_config;
+ struct regmap *xfi_mac;
+
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 8146cde4e8ba..72f7824fcc2e 100644
--- a/drivers/net/ethernet/airoha/airoha_regs.h
+++ b/drivers/net/ethernet/airoha/airoha_regs.h
@@ -356,6 +356,18 @@
#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 GENMASK(31, 26)
+#define GDMA4_SGMII1_TX_FRAG_SIZE GENMASK(25, 16)
+#define GDMA4_SGMII0_TX_WEIGHT GENMASK(15, 10)
+#define GDMA4_SGMII0_TX_FRAG_SIZE GENMASK(9, 0)
+
+#define REG_GDMA4_RMBI_FRAG 0x202c
+#define GDMA4_SGMII1_RX_WEIGHT GENMASK(31, 26)
+#define GDMA4_SGMII1_RX_FRAG_SIZE GENMASK(25, 16)
+#define GDMA4_SGMII0_RX_WEIGHT GENMASK(15, 10)
+#define GDMA4_SGMII0_RX_FRAG_SIZE GENMASK(9, 0)
+
#define REG_MC_VLAN_EN 0x2100
#define MC_VLAN_EN_MASK BIT(0)

diff --git a/include/linux/pcs/pcs-airoha.h b/include/linux/pcs/pcs-airoha.h
index 07797645ff15..947dbcbc5206 100644
--- a/include/linux/pcs/pcs-airoha.h
+++ b/include/linux/pcs/pcs-airoha.h
@@ -5,7 +5,22 @@

/* XFI_MAC */
#define AIROHA_PCS_XFI_MAC_XFI_GIB_CFG 0x0
+#define AIROHA_PCS_XFI_RX_FRAG_LEN GENMASK(26, 22)
+#define AIROHA_PCS_XFI_TX_FRAG_LEN GENMASK(21, 17)
+#define AIROHA_PCS_XFI_IPG_NUM GENMASK(15, 10)
#define AIROHA_PCS_XFI_TX_FC_EN BIT(5)
#define AIROHA_PCS_XFI_RX_FC_EN BIT(4)
+#define AIROHA_PCS_XFI_RXMPI_STOP BIT(3)
+#define AIROHA_PCS_XFI_RXMBI_STOP BIT(2)
+#define AIROHA_PCS_XFI_TXMPI_STOP BIT(1)
+#define AIROHA_PCS_XFI_TXMBI_STOP BIT(0)
+#define AIROHA_PCS_XFI_MAC_XFI_LOGIC_RST 0x10
+#define AIROHA_PCS_XFI_MAC_LOGIC_RST BIT(0)
+#define AIROHA_PCS_XFI_MAC_XFI_MACADDRH 0x60
+#define AIROHA_PCS_XFI_MAC_MACADDRH GENMASK(15, 0)
+#define AIROHA_PCS_XFI_MAC_XFI_MACADDRL 0x64
+#define AIROHA_PCS_XFI_MAC_MACADDRL GENMASK(31, 0)
+#define AIROHA_PCS_XFI_MAC_XFI_CNT_CLR 0x100
+#define AIROHA_PCS_XFI_GLB_CNT_CLR BIT(0)

#endif /* __LINUX_PCS_AIROHA_H */
--
2.48.1