net: tn40xx: add pci driver for Tehuti Networks TN40xx chips

This just adds the scaffolding for an ethernet driver for Tehuti
Networks TN40xx chips.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Link: https://patch.msgid.link/20240623235507.108147-3-fujita.tomonori@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

MAINTAINERS

@@ -22148,7 +22148,13 @@ TEHUTI ETHERNET DRIVER
 M:	Andy Gospodarek <andy@greyhouse.net>
 L:	netdev@vger.kernel.org
 S:	Supported
-F:	drivers/net/ethernet/tehuti/*
+F:	drivers/net/ethernet/tehuti/tehuti.*
+
+TEHUTI TN40XX ETHERNET DRIVER
+M:	FUJITA Tomonori <fujita.tomonori@gmail.com>
+L:	netdev@vger.kernel.org
+S:	Maintained
+F:	drivers/net/ethernet/tehuti/tn40*
 
 TELECOM CLOCK DRIVER FOR MCPL0010
 M:	Mark Gross <markgross@kernel.org>

drivers/net/ethernet/tehuti/Kconfig

@@ -23,4 +23,16 @@ config TEHUTI
 	help
 	  Tehuti Networks 10G Ethernet NIC
 
+config TEHUTI_TN40
+	tristate "Tehuti Networks TN40xx 10G Ethernet adapters"
+	depends on PCI
+	help
+	  This driver supports 10G Ethernet adapters using Tehuti Networks
+	  TN40xx chips. Currently, adapters with Applied Micro Circuits
+	  Corporation QT2025 are supported; Tehuti Networks TN9310,
+	  DLink DXE-810S, ASUS XG-C100F, and Edimax EN-9320.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called tn40xx.
+
 endif # NET_VENDOR_TEHUTI

drivers/net/ethernet/tehuti/Makefile

@@ -4,3 +4,6 @@
 #
 
 obj-$(CONFIG_TEHUTI) += tehuti.o
+
+tn40xx-y := tn40.o
+obj-$(CONFIG_TEHUTI_TN40) += tn40xx.o

drivers/net/ethernet/tehuti/tn40.c

+// SPDX-License-Identifier: GPL-2.0+
+/* Copyright (c) Tehuti Networks Ltd. */
+
+#include <linux/pci.h>
+
+#include "tn40.h"
+
+static int tn40_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	int ret;
+
+	ret = pci_enable_device(pdev);
+	if (ret)
+		return ret;
+	ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+	if (ret) {
+		dev_err(&pdev->dev, "failed to set DMA mask.\n");
+		goto err_disable_device;
+	}
+	return 0;
+err_disable_device:
+	pci_disable_device(pdev);
+	return ret;
+}
+
+static void tn40_remove(struct pci_dev *pdev)
+{
+	pci_disable_device(pdev);
+}
+
+static const struct pci_device_id tn40_id_table[] = {
+	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_TEHUTI, 0x4022,
+			 PCI_VENDOR_ID_TEHUTI, 0x3015) },
+	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_TEHUTI, 0x4022,
+			 PCI_VENDOR_ID_DLINK, 0x4d00) },
+	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_TEHUTI, 0x4022,
+			 PCI_VENDOR_ID_ASUSTEK, 0x8709) },
+	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_TEHUTI, 0x4022,
+			 PCI_VENDOR_ID_EDIMAX, 0x8103) },
+	{ }
+};
+
+static struct pci_driver tn40_driver = {
+	.name = TN40_DRV_NAME,
+	.id_table = tn40_id_table,
+	.probe = tn40_probe,
+	.remove = tn40_remove,
+};
+
+module_pci_driver(tn40_driver);
+
+MODULE_DEVICE_TABLE(pci, tn40_id_table);
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Tehuti Network TN40xx Driver");

drivers/net/ethernet/tehuti/tn40.h

+/* SPDX-License-Identifier: GPL-2.0+ */
+/* Copyright (c) Tehuti Networks Ltd. */
+
+#ifndef _TN40_H_
+#define _TN40_H_
+
+#define TN40_DRV_NAME "tn40xx"
+
+#endif /* _TN40XX_H */