[PATCH net-next v2] net: airoha: configure hw mac address according to the port id

[Lorenzo Bianconi]

GDM1 port on EN7581 SoC is connected to the lan dsa switch.
GDM{2,3,4} can be used as wan port connected to an external
phy module. Configure hw mac address registers according to the port id.

Signed-off-by: Lorenzo Bianconi <lorenzo at kernel.org>
---
Changes in v2:
- improve code readability adding reg offset for {LAN,WAN}_LMIN and
  {LAN,WAN}_LMAX regs
- fix signed-off-by tag
- Link to v1: https://lore.kernel.org/r/20240819-airoha-eth-wan-mac-addr-v1-1-e8d7c13b3182@kernel.org
---
 drivers/net/ethernet/mediatek/airoha_eth.c | 32 +++++++++++++++++++++---------
 1 file changed, 23 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/airoha_eth.c b/drivers/net/ethernet/mediatek/airoha_eth.c
index 1fb46db0c1e9..0c012efca3b0 100644
--- a/drivers/net/ethernet/mediatek/airoha_eth.c
+++ b/drivers/net/ethernet/mediatek/airoha_eth.c
@@ -67,9 +67,11 @@
 #define FE_RST_GDM3_MBI_ARB_MASK	BIT(2)
 #define FE_RST_CORE_MASK		BIT(0)
 
+#define REG_FE_WAN_MAC_H		0x0030
 #define REG_FE_LAN_MAC_H		0x0040
-#define REG_FE_LAN_MAC_LMIN		0x0044
-#define REG_FE_LAN_MAC_LMAX		0x0048
+
+#define REG_FE_MAC_LMIN(_n)		((_n) + 0x04)
+#define REG_FE_MAC_LMAX(_n)		((_n) + 0x08)
 
 #define REG_FE_CDM1_OQ_MAP0		0x0050
 #define REG_FE_CDM1_OQ_MAP1		0x0054
@@ -900,16 +902,28 @@ static void airoha_qdma_irq_disable(struct airoha_qdma *qdma, int index,
 	airoha_qdma_set_irqmask(qdma, index, mask, 0);
 }
 
-static void airoha_set_macaddr(struct airoha_eth *eth, const u8 *addr)
+static bool airhoa_is_lan_gdm_port(struct airoha_gdm_port *port)
 {
-	u32 val;
+	/* GDM1 port on EN7581 SoC is connected to the lan dsa switch.
+	 * GDM{2,3,4} can be used as wan port connected to an external
+	 * phy module.
+	 */
+	return port->id == 1;
+}
+
+static void airoha_set_macaddr(struct airoha_gdm_port *port, const u8 *addr)
+{
+	struct airoha_eth *eth = port->qdma->eth;
+	u32 val, reg;
 
+	reg = airhoa_is_lan_gdm_port(port) ? REG_FE_LAN_MAC_H
+					   : REG_FE_WAN_MAC_H;
 	val = (addr[0] << 16) | (addr[1] << 8) | addr[2];
-	airoha_fe_wr(eth, REG_FE_LAN_MAC_H, val);
+	airoha_fe_wr(eth, reg, val);
 
 	val = (addr[3] << 16) | (addr[4] << 8) | addr[5];
-	airoha_fe_wr(eth, REG_FE_LAN_MAC_LMIN, val);
-	airoha_fe_wr(eth, REG_FE_LAN_MAC_LMAX, val);
+	airoha_fe_wr(eth, REG_FE_MAC_LMIN(reg), val);
+	airoha_fe_wr(eth, REG_FE_MAC_LMAX(reg), val);
 }
 
 static void airoha_set_gdm_port_fwd_cfg(struct airoha_eth *eth, u32 addr,
@@ -2340,7 +2354,7 @@ static int airoha_dev_set_macaddr(struct net_device *dev, void *p)
 	if (err)
 		return err;
 
-	airoha_set_macaddr(port->qdma->eth, dev->dev_addr);
+	airoha_set_macaddr(port, dev->dev_addr);
 
 	return 0;
 }
@@ -2349,7 +2363,7 @@ static int airoha_dev_init(struct net_device *dev)
 {
 	struct airoha_gdm_port *port = netdev_priv(dev);
 
-	airoha_set_macaddr(port->qdma->eth, dev->dev_addr);
+	airoha_set_macaddr(port, dev->dev_addr);
 
 	return 0;
 }

---
base-commit: a99ef548bba01435f19137cf1670861be1c1ee4b
change-id: 20240819-airoha-eth-wan-mac-addr-0463b2bd89aa
prerequisite-change-id: 20240705-for-6-11-bpf-a349efc08df8:v2

Best regards,
-- 
Lorenzo Bianconi <lorenzo at kernel.org>