net: rnpgbe: Add n500/n210 chip support with BAR2 mapping

Add hardware initialization foundation for MUCSE 1Gbe controller,
including:
1. Map PCI BAR2 as hardware register base;
2. Bind PCI device to driver private data (struct mucse) and
   initialize hardware context (struct mucse_hw);
3. Reserve board-specific init framework via rnpgbe_init_hw.

Signed-off-by: Dong Yibo <dong100@mucse.com>
Reviewed-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Reviewed-by: MD Danish Anwar <danishanwar@ti.com>
Link: https://patch.msgid.link/20251101013849.120565-3-dong100@mucse.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

3 files changed, 98 insertions, 0 deletions

diff --git a/drivers/net/ethernet/mucse/rnpgbe/rnpgbe.h b/drivers/net/ethernet/mucse/rnpgbe/rnpgbe.h
index d3439d28c654..a121ce4872a6 100644
--- a/drivers/net/ethernet/mucse/rnpgbe/rnpgbe.h
+++ b/drivers/net/ethernet/mucse/rnpgbe/rnpgbe.h
@@ -9,6 +9,16 @@ enum rnpgbe_boards {
 	board_n210
 };
 
+struct mucse_hw {
+	void __iomem *hw_addr;
+};
+
+struct mucse {
+	struct net_device *netdev;
+	struct pci_dev *pdev;
+	struct mucse_hw hw;
+};
+
 /* Device IDs */
 #define PCI_VENDOR_ID_MUCSE               0x8848
 #define RNPGBE_DEVICE_ID_N500_QUAD_PORT   0x8308
diff --git a/drivers/net/ethernet/mucse/rnpgbe/rnpgbe_hw.h b/drivers/net/ethernet/mucse/rnpgbe/rnpgbe_hw.h
new file mode 100644
index 000000000000..3a779806e8be
--- /dev/null
+++ b/drivers/net/ethernet/mucse/rnpgbe/rnpgbe_hw.h
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright(c) 2020 - 2025 Mucse Corporation. */
+
+#ifndef _RNPGBE_HW_H
+#define _RNPGBE_HW_H
+
+#define RNPGBE_MAX_QUEUES 8
+#endif /* _RNPGBE_HW_H */
diff --git a/drivers/net/ethernet/mucse/rnpgbe/rnpgbe_main.c b/drivers/net/ethernet/mucse/rnpgbe/rnpgbe_main.c
index 019e819fb497..305657d73e25 100644
--- a/drivers/net/ethernet/mucse/rnpgbe/rnpgbe_main.c
+++ b/drivers/net/ethernet/mucse/rnpgbe/rnpgbe_main.c
@@ -2,8 +2,11 @@
 /* Copyright(c) 2020 - 2025 Mucse Corporation. */
 
 #include <linux/pci.h>
+#include <net/rtnetlink.h>
+#include <linux/etherdevice.h>
 
 #include "rnpgbe.h"
+#include "rnpgbe_hw.h"
 
 static const char rnpgbe_driver_name[] = "rnpgbe";
 
@@ -22,6 +25,54 @@ static struct pci_device_id rnpgbe_pci_tbl[] = {
 };
 
 /**
+ * rnpgbe_add_adapter - Add netdev for this pci_dev
+ * @pdev: PCI device information structure
+ * @board_type: board type
+ *
+ * rnpgbe_add_adapter initializes a netdev for this pci_dev
+ * structure. Initializes Bar map, private structure, and a
+ * hardware reset occur.
+ *
+ * Return: 0 on success, negative errno on failure
+ **/
+static int rnpgbe_add_adapter(struct pci_dev *pdev,
+			      int board_type)
+{
+	struct net_device *netdev;
+	void __iomem *hw_addr;
+	struct mucse *mucse;
+	struct mucse_hw *hw;
+	int err;
+
+	netdev = alloc_etherdev_mq(sizeof(struct mucse), RNPGBE_MAX_QUEUES);
+	if (!netdev)
+		return -ENOMEM;
+
+	SET_NETDEV_DEV(netdev, &pdev->dev);
+	mucse = netdev_priv(netdev);
+	mucse->netdev = netdev;
+	mucse->pdev = pdev;
+	pci_set_drvdata(pdev, mucse);
+
+	hw = &mucse->hw;
+	hw_addr = devm_ioremap(&pdev->dev,
+			       pci_resource_start(pdev, 2),
+			       pci_resource_len(pdev, 2));
+	if (!hw_addr) {
+		err = -EIO;
+		goto err_free_net;
+	}
+
+	hw->hw_addr = hw_addr;
+
+	return 0;
+
+err_free_net:
+	free_netdev(netdev);
+	return err;
+}
+
+/**
  * rnpgbe_probe - Device initialization routine
  * @pdev: PCI device information struct
  * @id: entry in rnpgbe_pci_tbl
@@ -33,6 +84,7 @@ static struct pci_device_id rnpgbe_pci_tbl[] = {
  **/
 static int rnpgbe_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
+	int board_type = id->driver_data;
 	int err;
 
 	err = pci_enable_device_mem(pdev);
@@ -60,6 +112,10 @@ static int rnpgbe_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		goto err_free_regions;
 	}
 
+	err = rnpgbe_add_adapter(pdev, board_type);
+	if (err)
+		goto err_free_regions;
+
 	return 0;
 err_free_regions:
 	pci_release_mem_regions(pdev);
@@ -69,6 +125,23 @@ err_disable_dev:
 }
 
 /**
+ * rnpgbe_rm_adapter - Remove netdev for this mucse structure
+ * @pdev: PCI device information struct
+ *
+ * rnpgbe_rm_adapter remove a netdev for this mucse structure
+ **/
+static void rnpgbe_rm_adapter(struct pci_dev *pdev)
+{
+	struct mucse *mucse = pci_get_drvdata(pdev);
+	struct net_device *netdev;
+
+	if (!mucse)
+		return;
+	netdev = mucse->netdev;
+	free_netdev(netdev);
+}
+
+/**
  * rnpgbe_remove - Device removal routine
  * @pdev: PCI device information struct
  *
@@ -79,6 +152,7 @@ err_disable_dev:
  **/
 static void rnpgbe_remove(struct pci_dev *pdev)
 {
+	rnpgbe_rm_adapter(pdev);
 	pci_release_mem_regions(pdev);
 	pci_disable_device(pdev);
 }
@@ -89,6 +163,12 @@ static void rnpgbe_remove(struct pci_dev *pdev)
  **/
 static void rnpgbe_dev_shutdown(struct pci_dev *pdev)
 {
+	struct mucse *mucse = pci_get_drvdata(pdev);
+	struct net_device *netdev = mucse->netdev;
+
+	rtnl_lock();
+	netif_device_detach(netdev);
+	rtnl_unlock();
 	pci_disable_device(pdev);
 }