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Message-ID: <20250826031044.563778-3-jchng@maxlinear.com>
Date: Tue, 26 Aug 2025 11:10:44 +0800
From: Jack Ping CHNG <jchng@...linear.com>
To: <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>
CC: <davem@...emloft.net>, <andrew+netdev@...n.ch>, <edumazet@...gle.com>,
<kuba@...nel.org>, <pabeni@...hat.com>, <robh@...nel.org>,
<krzk+dt@...nel.org>, <conor+dt@...nel.org>, <yzhu@...linear.com>,
<sureshnagaraj@...linear.com>, Jack Ping CHNG <jchng@...linear.com>
Subject: [PATCH net-next v2 2/2] net: maxlinear: Add support for MxL LGM SoC
Introduce the build system integration and initial implementation for the
MaxLinear LGM SoC Ethernet driver. This patch adds Kconfig and Makefile
entries, the main driver source file, and documentation.
Signed-off-by: Jack Ping CHNG <jchng@...linear.com>
---
.../device_drivers/ethernet/index.rst | 1 +
.../device_drivers/ethernet/maxlinear/mxl.rst | 61 ++++++
MAINTAINERS | 8 +
drivers/net/ethernet/Kconfig | 1 +
drivers/net/ethernet/Makefile | 1 +
drivers/net/ethernet/maxlinear/Kconfig | 15 ++
drivers/net/ethernet/maxlinear/Makefile | 6 +
drivers/net/ethernet/maxlinear/mxl_eth.c | 189 ++++++++++++++++++
8 files changed, 282 insertions(+)
create mode 100644 Documentation/networking/device_drivers/ethernet/maxlinear/mxl.rst
create mode 100644 drivers/net/ethernet/maxlinear/Kconfig
create mode 100644 drivers/net/ethernet/maxlinear/Makefile
create mode 100644 drivers/net/ethernet/maxlinear/mxl_eth.c
diff --git a/Documentation/networking/device_drivers/ethernet/index.rst b/Documentation/networking/device_drivers/ethernet/index.rst
index 40ac552641a3..13d3cbc96e87 100644
--- a/Documentation/networking/device_drivers/ethernet/index.rst
+++ b/Documentation/networking/device_drivers/ethernet/index.rst
@@ -44,6 +44,7 @@ Contents:
marvell/octeontx2
marvell/octeon_ep
marvell/octeon_ep_vf
+ maxlinear/mxl
mellanox/mlx5/index
meta/fbnic
microsoft/netvsc
diff --git a/Documentation/networking/device_drivers/ethernet/maxlinear/mxl.rst b/Documentation/networking/device_drivers/ethernet/maxlinear/mxl.rst
new file mode 100644
index 000000000000..7954c47347e7
--- /dev/null
+++ b/Documentation/networking/device_drivers/ethernet/maxlinear/mxl.rst
@@ -0,0 +1,61 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===============================================
+MaxLinear Multi-MAC Network Processor (NP)
+===============================================
+
+Copyright(c) 2025 MaxLinear, Inc.
+
+Overview
+========
+
+This document describes the Linux driver for the MaxLinear Network Processor
+(NP), a high-performance controller supporting multiple MACs and
+advanced packet processing capabilities.
+
+The MaxLinear Network processor integrates programmable hardware accelerators
+for tasks such as Layer 2, 3, 4 forwarding, flow steering, and traffic shaping.
+It is designed to operate in high-throughput applications, including data
+center switching, virtualized environments, and telco infrastructure.
+
+Key Features
+============
+
+- Support for up to 4 independent 10 Gbit/s MAC interfaces
+- Full-duplex 10G operation
+- Multiqueue support for parallel RX/TX paths (per MAC)
+
+Supported Devices
+=================
+
+The driver supports the following MaxLinear NPU family devices:
+- MaxLinear LGM
+
+Each device supports multiple MACs and high-performance data pipelines managed
+through internal firmware and programmable engines.
+
+Kernel Configuration
+====================
+
+The driver is located in the menu structure at:
+
+ -> Device Drivers
+ -> Network device support
+ -> Ethernet driver support
+ -> MaxLinear NPU Ethernet driver
+
+Or set in your kernel config:
+ CONFIG_NET_VENDOR_MAXLINEAR=y
+ CONFIG_MAXLINEAR_ETH=y
+
+Maintainers
+===========
+
+See the MAINTAINERS file:
+
+ MAXLINEAR ETHERNET DRIVER
+ M: Jack Ping Chng <jchng@...linear.com>
+ L: netdev@...r.kernel.org
+ S: Supported
+ F: drivers/net/ethernet/maxlinear/
+
diff --git a/MAINTAINERS b/MAINTAINERS
index fe168477caa4..e4765bd73615 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -15102,6 +15102,14 @@ W: https://linuxtv.org
T: git git://linuxtv.org/media.git
F: drivers/media/radio/radio-maxiradio*
+MAXLINEAR ETHERNET DRIVER
+M: Jack Ping Chng <jchng@...linear.com>
+L: netdev@...r.kernel.org
+S: Maintained
+F: Documentation/devicetree/bindings/net/mxl,lgm-eth.yaml
+F: Documentation/networking/device_drivers/ethernet/maxlinear/mxl.rst
+F: drivers/net/ethernet/maxlinear/mxl_eth.c
+
MAXLINEAR ETHERNET PHY DRIVER
M: Xu Liang <lxu@...linear.com>
L: netdev@...r.kernel.org
diff --git a/drivers/net/ethernet/Kconfig b/drivers/net/ethernet/Kconfig
index f86d4557d8d7..3e94ff7922c8 100644
--- a/drivers/net/ethernet/Kconfig
+++ b/drivers/net/ethernet/Kconfig
@@ -121,6 +121,7 @@ config LANTIQ_XRX200
source "drivers/net/ethernet/adi/Kconfig"
source "drivers/net/ethernet/litex/Kconfig"
source "drivers/net/ethernet/marvell/Kconfig"
+source "drivers/net/ethernet/maxlinear/Kconfig"
source "drivers/net/ethernet/mediatek/Kconfig"
source "drivers/net/ethernet/mellanox/Kconfig"
source "drivers/net/ethernet/meta/Kconfig"
diff --git a/drivers/net/ethernet/Makefile b/drivers/net/ethernet/Makefile
index 67182339469a..760d598df197 100644
--- a/drivers/net/ethernet/Makefile
+++ b/drivers/net/ethernet/Makefile
@@ -58,6 +58,7 @@ obj-$(CONFIG_LANTIQ_ETOP) += lantiq_etop.o
obj-$(CONFIG_LANTIQ_XRX200) += lantiq_xrx200.o
obj-$(CONFIG_NET_VENDOR_LITEX) += litex/
obj-$(CONFIG_NET_VENDOR_MARVELL) += marvell/
+obj-$(CONFIG_NET_VENDOR_MAXLINEAR) += maxlinear/
obj-$(CONFIG_NET_VENDOR_MEDIATEK) += mediatek/
obj-$(CONFIG_NET_VENDOR_MELLANOX) += mellanox/
obj-$(CONFIG_NET_VENDOR_META) += meta/
diff --git a/drivers/net/ethernet/maxlinear/Kconfig b/drivers/net/ethernet/maxlinear/Kconfig
new file mode 100644
index 000000000000..b88cdd9675fb
--- /dev/null
+++ b/drivers/net/ethernet/maxlinear/Kconfig
@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config NET_VENDOR_MAXLINEAR
+ bool "MaxLinear devices"
+ help
+ If you have a MaxLinear SoC with ethernet, say Y.
+
+if NET_VENDOR_MAXLINEAR
+
+config MXL_NPU
+ tristate "MaxLinear NPU Ethernet driver"
+ help
+ This driver supports the MaxLinear NPU Ethernet.
+
+endif #NET_VENDOR_MAXLINEAR
+
diff --git a/drivers/net/ethernet/maxlinear/Makefile b/drivers/net/ethernet/maxlinear/Makefile
new file mode 100644
index 000000000000..0577b325494c
--- /dev/null
+++ b/drivers/net/ethernet/maxlinear/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for the MaxLinear network device drivers.
+#
+
+obj-$(CONFIG_MXL_NPU) += mxl_eth.o
diff --git a/drivers/net/ethernet/maxlinear/mxl_eth.c b/drivers/net/ethernet/maxlinear/mxl_eth.c
new file mode 100644
index 000000000000..093ad9b27a81
--- /dev/null
+++ b/drivers/net/ethernet/maxlinear/mxl_eth.c
@@ -0,0 +1,189 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2025 MaxLinear, Inc.
+ */
+#include <linux/clk.h>
+#include <linux/etherdevice.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+
+#define ETH_TX_TIMEOUT (10 * HZ)
+#define MXL_NUM_TX_RING 8
+#define MXL_NUM_RX_RING 8
+#define MXL_NUM_PORT 2
+
+struct mxl_eth_drvdata {
+ struct net_device *ndevs[MXL_NUM_PORT];
+ struct clk *clks;
+};
+
+struct eth_priv {
+ struct platform_device *pdev;
+ struct device_node *np;
+};
+
+static int mxl_eth_open(struct net_device *ndev)
+{
+ netif_carrier_on(ndev);
+ netif_start_queue(ndev);
+ return 0;
+}
+
+static int mxl_eth_stop(struct net_device *ndev)
+{
+ netif_stop_queue(ndev);
+ netif_carrier_off(ndev);
+ return 0;
+}
+
+static int mxl_eth_start_xmit(struct sk_buff *skb, struct net_device *ndev)
+{
+ dev_kfree_skb(skb);
+ return NETDEV_TX_OK;
+}
+
+static const struct net_device_ops mxl_eth_netdev_ops = {
+ .ndo_open = mxl_eth_open,
+ .ndo_stop = mxl_eth_stop,
+ .ndo_start_xmit = mxl_eth_start_xmit,
+};
+
+static int mxl_eth_create_ndev(struct platform_device *pdev,
+ struct device_node *np,
+ struct net_device **ndev_out)
+{
+ struct net_device *ndev;
+ struct eth_priv *priv;
+ int ret;
+
+ ndev = devm_alloc_etherdev_mqs(&pdev->dev, sizeof(struct eth_priv),
+ MXL_NUM_TX_RING, MXL_NUM_RX_RING);
+ if (!ndev) {
+ dev_err(&pdev->dev, "alloc_etherdev_mq failed\n");
+ return -ENOMEM;
+ }
+
+ ndev->netdev_ops = &mxl_eth_netdev_ops;
+ ndev->watchdog_timeo = ETH_TX_TIMEOUT;
+ ndev->max_mtu = ETH_FRAME_LEN;
+ ndev->min_mtu = ETH_MIN_MTU;
+ SET_NETDEV_DEV(ndev, &pdev->dev);
+
+ priv = netdev_priv(ndev);
+ priv->pdev = pdev;
+ priv->np = np;
+
+ ret = register_netdev(ndev);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to register net device\n");
+ return ret;
+ }
+
+ *ndev_out = ndev;
+ return 0;
+}
+
+static void mxl_eth_cleanup(struct mxl_eth_drvdata *drvdata)
+{
+ int i;
+
+ for (i = 0; i < MXL_NUM_PORT && drvdata->ndevs[i]; i++) {
+ unregister_netdev(drvdata->ndevs[i]);
+ drvdata->ndevs[i] = NULL;
+ }
+}
+
+static int mxl_eth_probe(struct platform_device *pdev)
+{
+ struct mxl_eth_drvdata *drvdata;
+ struct reset_control *rst;
+ struct net_device *ndev;
+ struct device_node *np;
+ int ret, i;
+
+ drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
+ if (!drvdata)
+ return -ENOMEM;
+
+ drvdata->clks = devm_clk_get_enabled(&pdev->dev, "ethif");
+ if (IS_ERR(drvdata->clks))
+ return dev_err_probe(&pdev->dev, PTR_ERR(drvdata->clks),
+ "failed to get/enable clock\n");
+
+ rst = devm_reset_control_get_optional(&pdev->dev, NULL);
+ if (IS_ERR(rst)) {
+ dev_err(&pdev->dev,
+ "failed to get optional reset control: %ld\n",
+ PTR_ERR(rst));
+ ret = PTR_ERR(rst);
+ goto err_cleanup;
+ }
+
+ if (rst) {
+ ret = reset_control_assert(rst);
+ if (ret)
+ goto err_cleanup;
+
+ udelay(1);
+
+ ret = reset_control_deassert(rst);
+ if (ret)
+ goto err_cleanup;
+ }
+
+ platform_set_drvdata(pdev, drvdata);
+
+ i = 0;
+ for_each_available_child_of_node(pdev->dev.of_node, np) {
+ if (!of_device_is_compatible(np, "mxl,eth-mac"))
+ continue;
+
+ ret = mxl_eth_create_ndev(pdev, np, &ndev);
+ if (ret)
+ goto err_cleanup;
+
+ drvdata->ndevs[i++] = ndev;
+ if (i >= MXL_NUM_PORT)
+ break;
+ }
+
+ return 0;
+
+err_cleanup:
+ mxl_eth_cleanup(drvdata);
+ return ret;
+}
+
+static void mxl_eth_remove(struct platform_device *pdev)
+{
+ struct mxl_eth_drvdata *drvdata = platform_get_drvdata(pdev);
+
+ mxl_eth_cleanup(drvdata);
+}
+
+/* Device Tree match table */
+static const struct of_device_id mxl_eth_of_match[] = {
+ { .compatible = "mxl,lgm-eth" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mxl_eth_of_match);
+
+/* Platform driver struct */
+static struct platform_driver mxl_eth_drv = {
+ .probe = mxl_eth_probe,
+ .remove = mxl_eth_remove,
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .of_match_table = mxl_eth_of_match,
+ },
+};
+
+module_platform_driver(mxl_eth_drv);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Ethernet driver for MxL SoC");
--
2.34.1
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