ethernet: bundle module for Motorcomm YT6801

- The Asus XC-LS3A6M motherboard (Loongson 3A6000) comes with two Ethernet
  ports, which uses a yt6801 controller.
- This patch introduces an out of tree module to provide support for this
  NIC. [^1]
- Refactor module tree to make it work with Kconfig. [^2]
- Drop unneeded installation script (yt_nic_install.sh).
- Trim README to remove useless installation instructions.
- enable YT6801 for x86 arm64 and loongarch as module
- Refactor according to the kernel code style

[^1]: Ref: https://www.motor-comm.com/Public/Uploads/uploadfile/files/20240104/yt6801-linux-driver-1.0.27.zip
[^2]: CONFIG_NET_VENDOR_MOTORCOMM =(y)=> CONFIG_YT8601 (tristate).

Co-authored-by: Mingcong Bai <[email protected]>
Co-authored-by: Xiaotian Wu <[email protected]>
Signed-off-by: Yanteng Si <[email protected]>

arch/loongarch/configs/loongson3_defconfig

@@ -871,6 +871,7 @@ CONFIG_8139TOO=m
 # CONFIG_8139TOO_PIO is not set
 CONFIG_8139TOO_8129=y
 CONFIG_R8169=m
+CONFIG_YT6801=m
 # CONFIG_NET_VENDOR_RENESAS is not set
 # CONFIG_NET_VENDOR_ROCKER is not set
 # CONFIG_NET_VENDOR_SAMSUNG is not set

drivers/net/ethernet/Kconfig

@@ -127,6 +127,7 @@ source "drivers/net/ethernet/mediatek/Kconfig"
 source "drivers/net/ethernet/mellanox/Kconfig"
 source "drivers/net/ethernet/micrel/Kconfig"
 source "drivers/net/ethernet/microchip/Kconfig"
+source "drivers/net/ethernet/motorcomm/Kconfig"
 source "drivers/net/ethernet/mscc/Kconfig"
 source "drivers/net/ethernet/microsoft/Kconfig"
 source "drivers/net/ethernet/moxa/Kconfig"

drivers/net/ethernet/Makefile

@@ -61,6 +61,7 @@ obj-$(CONFIG_NET_VENDOR_MEDIATEK) += mediatek/
 obj-$(CONFIG_NET_VENDOR_MELLANOX) += mellanox/
 obj-$(CONFIG_NET_VENDOR_MICREL) += micrel/
 obj-$(CONFIG_NET_VENDOR_MICROCHIP) += microchip/
+obj-$(CONFIG_NET_VENDOR_MOTORCOMM) += motorcomm/
 obj-$(CONFIG_NET_VENDOR_MICROSEMI) += mscc/
 obj-$(CONFIG_NET_VENDOR_MOXART) += moxa/
 obj-$(CONFIG_NET_VENDOR_MYRI) += myricom/

drivers/net/ethernet/motorcomm/Kconfig

@@ -0,0 +1,27 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# Copyright (c) 2023 Motorcomm, Inc.
+
+config NET_VENDOR_MOTORCOMM
+	bool "Motorcomm devices"
+	default y
+	depends on PCI
+	help
+	  If you have a network (Ethernet) card belonging to this class, say Y.
+
+	  Note that the answer to this question doesn't directly affect the
+	  kernel: saying N will just cause the configurator to skip all
+	  the questions about Motorcomm cards. If you say Y, you will be asked
+	  for your specific card in the following questions.
+
+if NET_VENDOR_MOTORCOMM
+
+config YT6801
+	tristate "Motorcomm YT6801 Ethernet support"
+	depends on PCI
+	help
+	  If you have a network (Ethernet) controller of this type, say Y here.
+
+	  To compile this driver as a module, choose M here. The module
+	  will be called forcedeth.
+
+endif # NET_VENDOR_MOTORCOMM

drivers/net/ethernet/motorcomm/Makefile

@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# Copyright (c) 2023 Motorcomm, Inc.
+
+obj-$(CONFIG_YT6801) += yt6801/

drivers/net/ethernet/motorcomm/yt6801/Makefile

@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# Copyright (c) 2023 Motorcomm, Inc.
+
+
+obj-$(CONFIG_YT6801) += yt6801.o
+
+yt6801-objs := fuxi-gmac-common.o \
+	fuxi-gmac-desc.o \
+	fuxi-gmac-ethtool.o \
+	fuxi-gmac-hw.o \
+	fuxi-gmac-net.o \
+	fuxi-gmac-pci.o \
+	fuxi-gmac-phy.o \
+	fuxi-efuse.o \
+	fuxi-gmac-debugfs.o

drivers/net/ethernet/motorcomm/yt6801/fuxi-dbg.h

@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (c) 2021 Motorcomm Corporation. */
+
+#ifndef _MP_DBG_H
+#define _MP_DBG_H
+
+/* Message verbosity: lower values indicate higher urgency */
+#define MP_OFF          0
+#define MP_ERROR        1
+#define MP_WARN         2
+#define MP_TRACE        3
+#define MP_INFO         4
+#define MP_LOUD         5
+
+#endif	/* _MP_DBG_H */