bng_en: Add PCI interface

Add basic pci interface to the driver which supports
the BCM5770X NIC family.

Signed-off-by: Vikas Gupta <vikas.gupta@broadcom.com>
Reviewed-by: Bhargava Chenna Marreddy <bhargava.marreddy@broadcom.com>
Reviewed-by: Rajashekar Hudumula <rajashekar.hudumula@broadcom.com>
Link: https://patch.msgid.link/20250701143511.280702-2-vikas.gupta@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

MAINTAINERS

@@ -4858,6 +4858,12 @@ F:	drivers/firmware/broadcom/tee_bnxt_fw.c
 F:	drivers/net/ethernet/broadcom/bnxt/
 F:	include/linux/firmware/broadcom/tee_bnxt_fw.h
 
+BROADCOM BNG_EN 800 GIGABIT ETHERNET DRIVER
+M:	Vikas Gupta <vikas.gupta@broadcom.com>
+L:	netdev@vger.kernel.org
+S:	Maintained
+F:	drivers/net/ethernet/broadcom/bnge/
+
 BROADCOM BRCM80211 IEEE802.11 WIRELESS DRIVERS
 M:	Arend van Spriel <arend.vanspriel@broadcom.com>
 L:	linux-wireless@vger.kernel.org

drivers/net/ethernet/broadcom/Kconfig

@@ -253,6 +253,14 @@ config BNXT_HWMON
 	  Say Y if you want to expose the thermal sensor data on NetXtreme-C/E
 	  devices, via the hwmon sysfs interface.
 
+config BNGE
+	tristate "Broadcom Ethernet device support"
+	depends on PCI
+	help
+	  This driver supports Broadcom 50/100/200/400/800 gigabit Ethernet cards.
+	  The module will be called bng_en. To compile this driver as a module,
+	  choose M here.
+
 config BCMASP
 	tristate "Broadcom ASP 2.0 Ethernet support"
 	depends on ARCH_BRCMSTB || COMPILE_TEST

drivers/net/ethernet/broadcom/Makefile

@@ -18,3 +18,4 @@ obj-$(CONFIG_BGMAC_PLATFORM) += bgmac-platform.o
 obj-$(CONFIG_SYSTEMPORT) += bcmsysport.o
 obj-$(CONFIG_BNXT) += bnxt/
 obj-$(CONFIG_BCMASP) += asp2/
+obj-$(CONFIG_BNGE) += bnge/

drivers/net/ethernet/broadcom/bnge/Makefile

@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+obj-$(CONFIG_BNGE) += bng_en.o
+
+bng_en-y := bnge_core.o

drivers/net/ethernet/broadcom/bnge/bnge.h

@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (c) 2025 Broadcom */
+
+#ifndef _BNGE_H_
+#define _BNGE_H_
+
+#define DRV_NAME	"bng_en"
+#define DRV_SUMMARY	"Broadcom 800G Ethernet Linux Driver"
+
+extern char bnge_driver_name[];
+
+enum board_idx {
+	BCM57708,
+};
+
+#endif /* _BNGE_H_ */

drivers/net/ethernet/broadcom/bnge/bnge_core.c

@@ -0,0 +1,141 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2025 Broadcom.
+
+#include <linux/init.h>
+#include <linux/crash_dump.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+
+#include "bnge.h"
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION(DRV_SUMMARY);
+
+char bnge_driver_name[] = DRV_NAME;
+
+static const struct {
+	char *name;
+} board_info[] = {
+	[BCM57708] = { "Broadcom BCM57708 50Gb/100Gb/200Gb/400Gb/800Gb Ethernet" },
+};
+
+static const struct pci_device_id bnge_pci_tbl[] = {
+	{ PCI_VDEVICE(BROADCOM, 0x1780), .driver_data = BCM57708 },
+	/* Required last entry */
+	{0, }
+};
+MODULE_DEVICE_TABLE(pci, bnge_pci_tbl);
+
+static void bnge_print_device_info(struct pci_dev *pdev, enum board_idx idx)
+{
+	struct device *dev = &pdev->dev;
+
+	dev_info(dev, "%s found at mem %lx\n", board_info[idx].name,
+		 (long)pci_resource_start(pdev, 0));
+
+	pcie_print_link_status(pdev);
+}
+
+static void bnge_pci_disable(struct pci_dev *pdev)
+{
+	pci_release_regions(pdev);
+	if (pci_is_enabled(pdev))
+		pci_disable_device(pdev);
+}
+
+static int bnge_pci_enable(struct pci_dev *pdev)
+{
+	int rc;
+
+	rc = pci_enable_device(pdev);
+	if (rc) {
+		dev_err(&pdev->dev, "Cannot enable PCI device, aborting\n");
+		return rc;
+	}
+
+	if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
+		dev_err(&pdev->dev,
+			"Cannot find PCI device base address, aborting\n");
+		rc = -ENODEV;
+		goto err_pci_disable;
+	}
+
+	rc = pci_request_regions(pdev, bnge_driver_name);
+	if (rc) {
+		dev_err(&pdev->dev, "Cannot obtain PCI resources, aborting\n");
+		goto err_pci_disable;
+	}
+
+	dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+
+	pci_set_master(pdev);
+
+	return 0;
+
+err_pci_disable:
+	pci_disable_device(pdev);
+	return rc;
+}
+
+static int bnge_probe_one(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	int rc;
+
+	if (pci_is_bridge(pdev))
+		return -ENODEV;
+
+	if (!pdev->msix_cap) {
+		dev_err(&pdev->dev, "MSIX capability missing, aborting\n");
+		return -ENODEV;
+	}
+
+	if (is_kdump_kernel()) {
+		pci_clear_master(pdev);
+		pcie_flr(pdev);
+	}
+
+	rc = bnge_pci_enable(pdev);
+	if (rc)
+		return rc;
+
+	bnge_print_device_info(pdev, ent->driver_data);
+
+	pci_save_state(pdev);
+
+	return 0;
+}
+
+static void bnge_remove_one(struct pci_dev *pdev)
+{
+	bnge_pci_disable(pdev);
+}
+
+static void bnge_shutdown(struct pci_dev *pdev)
+{
+	pci_disable_device(pdev);
+
+	if (system_state == SYSTEM_POWER_OFF) {
+		pci_wake_from_d3(pdev, 0);
+		pci_set_power_state(pdev, PCI_D3hot);
+	}
+}
+
+static struct pci_driver bnge_driver = {
+	.name		= bnge_driver_name,
+	.id_table	= bnge_pci_tbl,
+	.probe		= bnge_probe_one,
+	.remove		= bnge_remove_one,
+	.shutdown	= bnge_shutdown,
+};
+
+static int __init bnge_init_module(void)
+{
+	return pci_register_driver(&bnge_driver);
+}
+module_init(bnge_init_module);
+
+static void __exit bnge_exit_module(void)
+{
+	pci_unregister_driver(&bnge_driver);
+}
+module_exit(bnge_exit_module);