Subject: [PATCH net-next V1 3/7] net: lan743x: Add SFP support check flag

From: Raju Lakkaraju <[email-masked]>
Date: Tue, 17 Oct 2023 15:12:04 +0530

PCI11x1x chip support the Pluggable module (SFP) depend on Board requirement.
sfp support information programmed in eeprom.
Flag "is_sfp_support_en" update on "STRAP" register.

Signed-off-by: Raju Lakkaraju <[email-masked]>
---
 drivers/net/ethernet/microchip/lan743x_main.c | 27 ++++++++++++++++---
 drivers/net/ethernet/microchip/lan743x_main.h |  3 +++
 2 files changed, 27 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/microchip/lan743x_main.c b/drivers/net/ethernet/microchip/lan743x_main.c
index e47f0ae1770d..eee3fe7e0c66 100644
--- a/drivers/net/ethernet/microchip/lan743x_main.c
+++ b/drivers/net/ethernet/microchip/lan743x_main.c
@@ -25,7 +25,7 @@
 #define PCS_POWER_STATE_DOWN	0x6
 #define PCS_POWER_STATE_UP	0x4
 
-static void pci11x1x_strap_get_status(struct lan743x_adapter *adapter)
+static int pci11x1x_strap_get_status(struct lan743x_adapter *adapter)
 {
 	u32 chip_rev;
 	u32 cfg_load;
@@ -38,7 +38,7 @@ static void pci11x1x_strap_get_status(struct lan743x_adapter *adapter)
 	if (ret < 0) {
 		netif_err(adapter, drv, adapter->netdev,
 			  "Sys Lock acquire failed ret:%d\n", ret);
-		return;
+		return ret;
 	}
 
 	cfg_load = lan743x_csr_read(adapter, ETH_SYS_CONFIG_LOAD_STARTED_REG);
@@ -52,6 +52,11 @@ static void pci11x1x_strap_get_status(struct lan743x_adapter *adapter)
 			adapter->is_sgmii_en = true;
 		else
 			adapter->is_sgmii_en = false;
+
+		if ((strap & STRAP_SFP_USE_EN_) && (strap & STRAP_SFP_EN_))
+			adapter->is_sfp_support_en = true;
+		else
+			adapter->is_sfp_support_en = false;
 	} else {
 		chip_rev = lan743x_csr_read(adapter, FPGA_REV);
 		if (chip_rev) {
@@ -63,8 +68,21 @@ static void pci11x1x_strap_get_status(struct lan743x_adapter *adapter)
 			adapter->is_sgmii_en = false;
 		}
 	}
+
+	if (adapter->is_pci11x1x && !adapter->is_sgmii_en &&
+	    adapter->is_sfp_support_en) {
+		netif_err(adapter, drv, adapter->netdev,
+			  "Invalid eeprom sgmii support configuration\n");
+		return -EINVAL;
+	}
+
 	netif_dbg(adapter, drv, adapter->netdev,
 		  "SGMII I/F %sable\n", adapter->is_sgmii_en ? "En" : "Dis");
+	netif_dbg(adapter, drv, adapter->netdev,
+		  "SFP support %sable\n", adapter->is_sfp_support_en ?
+		  "En" : "Dis");
+
+	return 0;
 }
 
 static bool is_pci11x1x_chip(struct lan743x_adapter *adapter)
@@ -3259,7 +3277,9 @@ static int lan743x_hardware_init(struct lan743x_adapter *adapter,
 		adapter->max_tx_channels = PCI11X1X_MAX_TX_CHANNELS;
 		adapter->used_tx_channels = PCI11X1X_USED_TX_CHANNELS;
 		adapter->max_vector_count = PCI11X1X_MAX_VECTOR_COUNT;
-		pci11x1x_strap_get_status(adapter);
+		ret = pci11x1x_strap_get_status(adapter);
+		if (ret < 0)
+			return ret;
 		spin_lock_init(&adapter->eth_syslock_spinlock);
 		mutex_init(&adapter->sgmii_rw_lock);
 	} else {
@@ -3414,6 +3434,7 @@ static int lan743x_pcidev_probe(struct pci_dev *pdev,
 			      NETIF_MSG_LINK | NETIF_MSG_IFUP |
 			      NETIF_MSG_IFDOWN | NETIF_MSG_TX_QUEUED;
 	netdev->max_mtu = LAN743X_MAX_FRAME_SIZE;
+	adapter->is_sfp_support_en = false;
 
 	of_get_mac_address(pdev->dev.of_node, adapter->mac_address);
 
diff --git a/drivers/net/ethernet/microchip/lan743x_main.h b/drivers/net/ethernet/microchip/lan743x_main.h
index 52609fc13ad9..6a3a45b98140 100644
--- a/drivers/net/ethernet/microchip/lan743x_main.h
+++ b/drivers/net/ethernet/microchip/lan743x_main.h
@@ -34,6 +34,8 @@
 
 #define STRAP_READ			(0x0C)
 #define STRAP_READ_USE_SGMII_EN_	BIT(22)
+#define STRAP_SFP_USE_EN_		BIT(31)
+#define STRAP_SFP_EN_			BIT(15)
 #define STRAP_READ_SGMII_EN_		BIT(6)
 #define STRAP_READ_SGMII_REFCLK_	BIT(5)
 #define STRAP_READ_SGMII_2_5G_		BIT(4)
@@ -1038,6 +1040,7 @@ struct lan743x_adapter {
 	u8			max_tx_channels;
 	u8			used_tx_channels;
 	u8			max_vector_count;
+	bool			is_sfp_support_en;
 
 #define LAN743X_ADAPTER_FLAG_OTP		BIT(0)
 	u32			flags;
-- 
2.34.1