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From: Gerhard Engleder <gerhard@engleder-embedded.com>
To: davem@davemloft.net, kuba@kernel.org, robh+dt@kernel.org,
	michal.simek@xilinx.com
Cc: netdev@vger.kernel.org, devicetree@vger.kernel.org,
	Gerhard Engleder <gerhard@engleder-embedded.com>
Subject: [PATCH net-next 4/5] tsnep: Add TSN endpoint Ethernet MAC driver
Date: Mon, 26 Jul 2021 21:46:02 +0200	[thread overview]
Message-ID: <20210726194603.14671-5-gerhard@engleder-embedded.com> (raw)
In-Reply-To: <20210726194603.14671-1-gerhard@engleder-embedded.com>

The TSN endpoint Ethernet MAC is a FPGA based network device for
real-time communication.

It is integrated as Ethernet controller with ethtool and PTP support.
For real-time communcation TC_SETUP_QDISC_TAPRIO is supported.

The device supports multiple TX/RX queue pairs. The first TX/RX queue
pair is used by the driver. All other TX/RX queue pairs shall be used
directly by real-time applications. Each TX/RX queue pair has its own
register set in a separate physical page and can be operated without any
driver interaction. This enables the direct use of TX/RX queue pairs by
real-time and/or safety applications running
- on dedicated CPU cores without any operating system
- on dedicated CPU cores with a separate operating system
- in user space without any Linux kernel interaction

The additional TX queues support timed transmission. The TX descriptor
ring contains relative timing information for every Ethernet frame.
Every TX descriptor defines the transmission time of the next frame with
an increment for the current transmission time (it does not define the
transmission time of its own frame). This way, the controller knows in
advance when a frame will be transmitted and can delay the fetching of the
descriptor and the frame as long as possible. Therefore, a frame can be
assigned to a descriptor as late as possible and the data can be as
up-to-date as possible, which is ideal for closed loop control. The
relative timing information of the next frame requires a periodic schedule
for frame transmission which is known in advance. This is usually the case
for time triggered real-time systems. E.g., for EtherCAT this mode of
timed transmission is used since 2011.

This driver provides a driver specific interface in tsnep_stream.c for
direct access to all but the first TX/RX queue pair. There are two
reasons for this interface. First: It enables the reservation or direct use
of TX/RX queue pairs by real-time application on dedicated CPU cores or
in user space. Second: The periodic schedule for timed transmission does
not fit to TC_SETUP_QDISC_ETF. ETF supports absolute transmission times
which are not known in advance and that is in stark contrast to relative
transmission times which are known in advance. Therefore, ETF cannot be
implemented with this controller. Additionally, this interface is used
for hardware testing.

Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
---
 drivers/net/ethernet/Kconfig                  |    1 +
 drivers/net/ethernet/Makefile                 |    1 +
 drivers/net/ethernet/engleder/Kconfig         |   28 +
 drivers/net/ethernet/engleder/Makefile        |    9 +
 drivers/net/ethernet/engleder/tsnep.h         |  199 +++
 drivers/net/ethernet/engleder/tsnep_ethtool.c |  287 ++++
 drivers/net/ethernet/engleder/tsnep_hw.h      |  276 ++++
 drivers/net/ethernet/engleder/tsnep_main.c    | 1418 +++++++++++++++++
 drivers/net/ethernet/engleder/tsnep_ptp.c     |  224 +++
 drivers/net/ethernet/engleder/tsnep_stream.c  |  489 ++++++
 drivers/net/ethernet/engleder/tsnep_tc.c      |  443 +++++
 drivers/net/ethernet/engleder/tsnep_test.c    |  811 ++++++++++
 12 files changed, 4186 insertions(+)
 create mode 100644 drivers/net/ethernet/engleder/Kconfig
 create mode 100644 drivers/net/ethernet/engleder/Makefile
 create mode 100644 drivers/net/ethernet/engleder/tsnep.h
 create mode 100644 drivers/net/ethernet/engleder/tsnep_ethtool.c
 create mode 100644 drivers/net/ethernet/engleder/tsnep_hw.h
 create mode 100644 drivers/net/ethernet/engleder/tsnep_main.c
 create mode 100644 drivers/net/ethernet/engleder/tsnep_ptp.c
 create mode 100644 drivers/net/ethernet/engleder/tsnep_stream.c
 create mode 100644 drivers/net/ethernet/engleder/tsnep_tc.c
 create mode 100644 drivers/net/ethernet/engleder/tsnep_test.c

diff --git a/drivers/net/ethernet/Kconfig b/drivers/net/ethernet/Kconfig
index 1cdff1dca790..32ad0c903548 100644
--- a/drivers/net/ethernet/Kconfig
+++ b/drivers/net/ethernet/Kconfig
@@ -72,6 +72,7 @@ config DNET
 source "drivers/net/ethernet/dec/Kconfig"
 source "drivers/net/ethernet/dlink/Kconfig"
 source "drivers/net/ethernet/emulex/Kconfig"
+source "drivers/net/ethernet/engleder/Kconfig"
 source "drivers/net/ethernet/ezchip/Kconfig"
 source "drivers/net/ethernet/faraday/Kconfig"
 source "drivers/net/ethernet/freescale/Kconfig"
diff --git a/drivers/net/ethernet/Makefile b/drivers/net/ethernet/Makefile
index cb3f9084a21b..86c1cc2e7d6e 100644
--- a/drivers/net/ethernet/Makefile
+++ b/drivers/net/ethernet/Makefile
@@ -35,6 +35,7 @@ obj-$(CONFIG_DNET) += dnet.o
 obj-$(CONFIG_NET_VENDOR_DEC) += dec/
 obj-$(CONFIG_NET_VENDOR_DLINK) += dlink/
 obj-$(CONFIG_NET_VENDOR_EMULEX) += emulex/
+obj-$(CONFIG_NET_VENDOR_ENGLEDER) += engleder/
 obj-$(CONFIG_NET_VENDOR_EZCHIP) += ezchip/
 obj-$(CONFIG_NET_VENDOR_FARADAY) += faraday/
 obj-$(CONFIG_NET_VENDOR_FREESCALE) += freescale/
diff --git a/drivers/net/ethernet/engleder/Kconfig b/drivers/net/ethernet/engleder/Kconfig
new file mode 100644
index 000000000000..d5d58dd5874b
--- /dev/null
+++ b/drivers/net/ethernet/engleder/Kconfig
@@ -0,0 +1,28 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Engleder network device configuration
+#
+
+config NET_VENDOR_ENGLEDER
+	bool "Engleder devices"
+	default y
+	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 Engleder devices. If you say Y, you will be asked
+	  for your specific card in the following questions.
+
+if NET_VENDOR_ENGLEDER
+
+config TSNEP
+	tristate "TSN endpoint support"
+	select PHYLIB
+	help
+	  Support for the Engleder TSN endpoint Ethernet MAC IP Core.
+
+	  To compile this driver as a module, choose M here. The module will be
+	  called tsnep.
+
+endif # NET_VENDOR_ENGLEDER
diff --git a/drivers/net/ethernet/engleder/Makefile b/drivers/net/ethernet/engleder/Makefile
new file mode 100644
index 000000000000..2e3ac078b24a
--- /dev/null
+++ b/drivers/net/ethernet/engleder/Makefile
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the Engleder Ethernet drivers
+#
+
+obj-$(CONFIG_TSNEP) += tsnep.o
+
+tsnep-objs := tsnep_main.o tsnep_ethtool.o tsnep_ptp.o tsnep_tc.o \
+	      tsnep_stream.o tsnep_test.o
diff --git a/drivers/net/ethernet/engleder/tsnep.h b/drivers/net/ethernet/engleder/tsnep.h
new file mode 100644
index 000000000000..a1c7fc51a353
--- /dev/null
+++ b/drivers/net/ethernet/engleder/tsnep.h
@@ -0,0 +1,199 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2021 Gerhard Engleder <gerhard@engleder-embedded.com> */
+
+#ifndef _TSNEP_H
+#define _TSNEP_H
+
+#include "tsnep_hw.h"
+
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/etherdevice.h>
+#include <linux/phy.h>
+#include <linux/ethtool.h>
+#include <linux/net_tstamp.h>
+#include <linux/ptp_clock_kernel.h>
+#include <linux/miscdevice.h>
+
+#define TSNEP "tsnep"
+
+#define TSNEP_RING_SIZE 256
+#define TSNEP_RING_ENTRIES_PER_PAGE (PAGE_SIZE / TSNEP_DESC_SIZE)
+#define TSNEP_RING_PAGE_COUNT (TSNEP_RING_SIZE / TSNEP_RING_ENTRIES_PER_PAGE)
+
+#define TSNEP_QUEUES 1
+#define TSNEP_MAX_STREAMS 7
+
+struct tsnep_stream {
+	struct tsnep_adapter *adapter;
+	phys_addr_t addr;
+	bool in_use;
+
+	/* DMA buffer */
+	struct mutex dma_buffer_lock;
+	struct rb_root dma_buffer;
+};
+
+struct tsnep_gcl {
+	void *addr;
+
+	u64 base_time;
+	u64 cycle_time;
+	u64 cycle_time_extension;
+
+	struct tsnep_gcl_operation operation[TSNEP_GCL_COUNT];
+	int count;
+
+	u64 change_limit;
+
+	u64 start_time;
+	bool change;
+};
+
+struct tsnep_tx_entry {
+	struct tsnep_tx_desc *desc;
+	struct tsnep_tx_desc_wb *desc_wb;
+	dma_addr_t desc_dma;
+	bool owner_user_flag;
+
+	u32 properties;
+
+	struct sk_buff *skb;
+	DEFINE_DMA_UNMAP_ADDR(dma);
+	DEFINE_DMA_UNMAP_LEN(len);
+};
+
+struct tsnep_tx {
+	struct tsnep_adapter *adapter;
+	void *addr;
+
+	void *page[TSNEP_RING_PAGE_COUNT];
+	dma_addr_t page_dma[TSNEP_RING_PAGE_COUNT];
+
+	/* TX ring lock */
+	spinlock_t lock;
+	struct tsnep_tx_entry entry[TSNEP_RING_SIZE];
+	int write;
+	int read;
+	u32 owner_counter;
+	int increment_owner_counter;
+
+	u32 packets;
+	u32 bytes;
+	u32 dropped;
+};
+
+struct tsnep_rx_entry {
+	struct tsnep_rx_desc *desc;
+	struct tsnep_rx_desc_wb *desc_wb;
+	dma_addr_t desc_dma;
+
+	u32 properties;
+
+	struct sk_buff *skb;
+	DEFINE_DMA_UNMAP_ADDR(dma);
+	DEFINE_DMA_UNMAP_LEN(len);
+};
+
+struct tsnep_rx {
+	struct tsnep_adapter *adapter;
+	void *addr;
+
+	void *page[TSNEP_RING_PAGE_COUNT];
+	dma_addr_t page_dma[TSNEP_RING_PAGE_COUNT];
+
+	struct tsnep_rx_entry entry[TSNEP_RING_SIZE];
+	int read;
+	u32 owner_counter;
+	int increment_owner_counter;
+
+	u32 packets;
+	u32 bytes;
+	u32 dropped;
+	u32 multicast;
+};
+
+struct tsnep_adapter {
+	struct net_device *netdev;
+	u8 mac_address[ETH_ALEN];
+	struct mii_bus *mdiobus;
+	phy_interface_t phy_mode;
+	struct phy_device *phydev;
+	int msg_enable;
+	bool loopback;
+	int loopback_speed;
+
+	struct platform_device *pdev;
+	void *addr;
+	unsigned long size;
+	int irq;
+	bool gmii2rgmii;
+
+	/* interrupt enable lock */
+	spinlock_t irq_lock;
+	u32 irq_enable;
+
+	/* management data lock */
+	struct mutex md_lock;
+	wait_queue_head_t md_wait;
+	bool md_active;
+
+	bool gate_control;
+	/* gate control lock */
+	struct mutex gate_control_lock;
+	bool gate_control_active;
+	struct tsnep_gcl gcl[2];
+	int next_gcl;
+
+	struct hwtstamp_config hwtstamp_config;
+	struct ptp_clock *ptp_clock;
+	struct ptp_clock_info ptp_clock_info;
+	/* ptp clock lock */
+	spinlock_t ptp_lock;
+
+	int num_tx_queues;
+	struct tsnep_tx tx[TSNEP_MAX_QUEUES];
+	int num_rx_queues;
+	struct tsnep_rx rx[TSNEP_MAX_QUEUES];
+
+	struct napi_struct napi;
+
+	int stream_count;
+	int index;
+	char name[16];
+	struct miscdevice misc;
+	/* stream char device lock */
+	struct mutex stream_lock;
+	struct tsnep_stream stream[TSNEP_MAX_STREAMS];
+};
+
+extern const struct ethtool_ops tsnep_ethtool_ops;
+
+int tsnep_ptp_init(struct tsnep_adapter *adapter);
+void tsnep_ptp_cleanup(struct tsnep_adapter *adapter);
+int tsnep_ptp_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd);
+
+int tsnep_tc_init(struct tsnep_adapter *adapter);
+void tsnep_tc_cleanup(struct tsnep_adapter *adapter);
+int tsnep_tc_setup(struct net_device *netdev, enum tc_setup_type type,
+		   void *type_data);
+
+int tsnep_stream_init(struct tsnep_adapter *adapter);
+void tsnep_stream_cleanup(struct tsnep_adapter *adapter);
+
+int tsnep_get_test_count(void);
+void tsnep_get_test_strings(u8 *data);
+void tsnep_self_test(struct net_device *netdev, struct ethtool_test *eth_test,
+		     u64 *data);
+
+int tsnep_read_md(struct tsnep_adapter *adapter, int phy, int reg, u16 *data);
+int tsnep_write_md(struct tsnep_adapter *adapter, int phy, int reg, u16 data);
+int tsnep_enable_loopback(struct tsnep_adapter *adapter, int speed);
+int tsnep_disable_loopback(struct tsnep_adapter *adapter);
+
+void tsnep_enable_irq(struct tsnep_adapter *adapter, u32 mask);
+void tsnep_disable_irq(struct tsnep_adapter *adapter, u32 mask);
+
+void tsnep_get_system_time(struct tsnep_adapter *adapter, u64 *time);
+
+#endif /* _TSNEP_H */
diff --git a/drivers/net/ethernet/engleder/tsnep_ethtool.c b/drivers/net/ethernet/engleder/tsnep_ethtool.c
new file mode 100644
index 000000000000..0341e4fcc52f
--- /dev/null
+++ b/drivers/net/ethernet/engleder/tsnep_ethtool.c
@@ -0,0 +1,287 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2021 Gerhard Engleder <gerhard@engleder-embedded.com> */
+
+#include "tsnep.h"
+
+static const char tsnep_stats_strings[][ETH_GSTRING_LEN] = {
+	"rx_packets",
+	"rx_bytes",
+	"rx_dropped",
+	"rx_multicast",
+	"rx_phy_errors",
+	"rx_forwarded_phy_errors",
+	"rx_invalid_frame_errors",
+	"tx_packets",
+	"tx_bytes",
+	"tx_dropped",
+};
+
+struct tsnep_stats {
+	u64 rx_packets;
+	u64 rx_bytes;
+	u64 rx_dropped;
+	u64 rx_multicast;
+	u64 rx_phy_errors;
+	u64 rx_forwarded_phy_errors;
+	u64 rx_invalid_frame_errors;
+	u64 tx_packets;
+	u64 tx_bytes;
+	u64 tx_dropped;
+};
+
+#define TSNEP_STATS_COUNT (sizeof(struct tsnep_stats) / sizeof(u64))
+
+static const char tsnep_rx_queue_stats_strings[][ETH_GSTRING_LEN] = {
+	"rx_%d_packets",
+	"rx_%d_bytes",
+	"rx_%d_dropped",
+	"rx_%d_multicast",
+	"rx_%d_no_descriptor_errors",
+	"rx_%d_buffer_too_small_errors",
+	"rx_%d_fifo_overflow_errors",
+	"rx_%d_invalid_frame_errors",
+};
+
+struct tsnep_rx_queue_stats {
+	u64 rx_packets;
+	u64 rx_bytes;
+	u64 rx_dropped;
+	u64 rx_multicast;
+	u64 rx_no_descriptor_errors;
+	u64 rx_buffer_too_small_errors;
+	u64 rx_fifo_overflow_errors;
+	u64 rx_invalid_frame_errors;
+};
+
+#define TSNEP_RX_QUEUE_STATS_COUNT (sizeof(struct tsnep_rx_queue_stats) / \
+				    sizeof(u64))
+
+static const char tsnep_tx_queue_stats_strings[][ETH_GSTRING_LEN] = {
+	"tx_%d_packets",
+	"tx_%d_bytes",
+	"tx_%d_dropped",
+};
+
+struct tsnep_tx_queue_stats {
+	u64 tx_packets;
+	u64 tx_bytes;
+	u64 tx_dropped;
+};
+
+#define TSNEP_TX_QUEUE_STATS_COUNT (sizeof(struct tsnep_tx_queue_stats) / \
+				    sizeof(u64))
+
+static void tsnep_ethtool_get_drvinfo(struct net_device *netdev,
+				      struct ethtool_drvinfo *drvinfo)
+{
+	struct tsnep_adapter *adapter = netdev_priv(netdev);
+
+	strscpy(drvinfo->driver, TSNEP, sizeof(drvinfo->driver));
+	strscpy(drvinfo->bus_info, dev_name(&adapter->pdev->dev),
+		sizeof(drvinfo->bus_info));
+}
+
+static int tsnep_get_regs_len(struct net_device *netdev)
+{
+	struct tsnep_adapter *adapter = netdev_priv(netdev);
+	int len;
+	int num_queues;
+
+	len = TSNEP_MAC_SIZE;
+	num_queues = max(adapter->num_tx_queues, adapter->num_rx_queues);
+	len += TSNEP_QUEUE_SIZE * (num_queues - 1);
+	len += TSNEP_QUEUE_SIZE * adapter->stream_count;
+
+	return len;
+}
+
+static void tsnep_get_regs(struct net_device *netdev, struct ethtool_regs *regs,
+			   void *p)
+{
+	struct tsnep_adapter *adapter = netdev_priv(netdev);
+
+	regs->version = 1;
+
+	memcpy_fromio(p, adapter->addr, regs->len);
+}
+
+static u32 tsnep_ethtool_get_msglevel(struct net_device *netdev)
+{
+	struct tsnep_adapter *adapter = netdev_priv(netdev);
+
+	return adapter->msg_enable;
+}
+
+static void tsnep_ethtool_set_msglevel(struct net_device *netdev, u32 data)
+{
+	struct tsnep_adapter *adapter = netdev_priv(netdev);
+
+	adapter->msg_enable = data;
+}
+
+static void tsnep_get_strings(struct net_device *netdev, u32 stringset,
+			      u8 *data)
+{
+	struct tsnep_adapter *adapter = netdev_priv(netdev);
+	int rx_count = adapter->num_rx_queues + adapter->stream_count;
+	int tx_count = adapter->num_tx_queues + adapter->stream_count;
+	int i, j;
+
+	switch (stringset) {
+	case ETH_SS_STATS:
+		memcpy(data, tsnep_stats_strings, sizeof(tsnep_stats_strings));
+		data += sizeof(tsnep_stats_strings);
+
+		for (i = 0; i < rx_count; i++) {
+			for (j = 0; j < TSNEP_RX_QUEUE_STATS_COUNT; j++) {
+				snprintf(data, ETH_GSTRING_LEN,
+					 tsnep_rx_queue_stats_strings[j], i);
+				data += ETH_GSTRING_LEN;
+			}
+		}
+
+		for (i = 0; i < tx_count; i++) {
+			for (j = 0; j < TSNEP_TX_QUEUE_STATS_COUNT; j++) {
+				snprintf(data, ETH_GSTRING_LEN,
+					 tsnep_tx_queue_stats_strings[j], i);
+				data += ETH_GSTRING_LEN;
+			}
+		}
+		break;
+	case ETH_SS_TEST:
+		tsnep_get_test_strings(data);
+		break;
+	}
+}
+
+static void tsnep_get_ethtool_stats(struct net_device *netdev,
+				    struct ethtool_stats *stats, u64 *data)
+{
+	struct tsnep_adapter *adapter = netdev_priv(netdev);
+	int rx_count = adapter->num_rx_queues + adapter->stream_count;
+	int tx_count = adapter->num_tx_queues + adapter->stream_count;
+	struct tsnep_stats tsnep_stats;
+	struct tsnep_rx_queue_stats tsnep_rx_queue_stats;
+	struct tsnep_tx_queue_stats tsnep_tx_queue_stats;
+	u32 reg;
+	int i;
+
+	memset(&tsnep_stats, 0, sizeof(tsnep_stats));
+	for (i = 0; i < adapter->num_rx_queues; i++) {
+		tsnep_stats.rx_packets += adapter->rx[i].packets;
+		tsnep_stats.rx_bytes += adapter->rx[i].bytes;
+		tsnep_stats.rx_dropped += adapter->rx[i].dropped;
+		tsnep_stats.rx_multicast += adapter->rx[i].multicast;
+	}
+	reg = ioread32(adapter->addr + ECM_STAT);
+	tsnep_stats.rx_phy_errors =
+		(reg & ECM_STAT_RX_ERR_MASK) >> ECM_STAT_RX_ERR_SHIFT;
+	tsnep_stats.rx_forwarded_phy_errors =
+		(reg & ECM_STAT_FWD_RX_ERR_MASK) >> ECM_STAT_FWD_RX_ERR_SHIFT;
+	tsnep_stats.rx_invalid_frame_errors =
+		(reg & ECM_STAT_INV_FRM_MASK) >> ECM_STAT_INV_FRM_SHIFT;
+	for (i = 0; i < adapter->num_tx_queues; i++) {
+		tsnep_stats.tx_packets += adapter->tx[i].packets;
+		tsnep_stats.tx_bytes += adapter->tx[i].bytes;
+		tsnep_stats.tx_dropped += adapter->tx[i].dropped;
+	}
+	memcpy(data, &tsnep_stats, sizeof(tsnep_stats));
+	data += TSNEP_STATS_COUNT;
+
+	for (i = 0; i < rx_count; i++) {
+		memset(&tsnep_rx_queue_stats, 0, sizeof(tsnep_rx_queue_stats));
+		tsnep_rx_queue_stats.rx_packets = adapter->rx[i].packets;
+		tsnep_rx_queue_stats.rx_bytes = adapter->rx[i].bytes;
+		tsnep_rx_queue_stats.rx_dropped = adapter->rx[i].dropped;
+		tsnep_rx_queue_stats.rx_multicast = adapter->rx[i].multicast;
+		reg = ioread32(adapter->addr + TSNEP_QUEUE(i) +
+			       TSNEP_RX_STATISTIC);
+		tsnep_rx_queue_stats.rx_no_descriptor_errors =
+			(reg & TSNEP_RX_STATISTIC_NO_DESC_MASK) >>
+			TSNEP_RX_STATISTIC_NO_DESC_SHIFT;
+		tsnep_rx_queue_stats.rx_buffer_too_small_errors =
+			(reg & TSNEP_RX_STATISTIC_BUFFER_TOO_SMALL_MASK) >>
+			TSNEP_RX_STATISTIC_BUFFER_TOO_SMALL_SHIFT;
+		tsnep_rx_queue_stats.rx_fifo_overflow_errors =
+			(reg & TSNEP_RX_STATISTIC_FIFO_OVERFLOW_MASK) >>
+			TSNEP_RX_STATISTIC_FIFO_OVERFLOW_SHIFT;
+		tsnep_rx_queue_stats.rx_invalid_frame_errors =
+			(reg & TSNEP_RX_STATISTIC_INVALID_FRAME_MASK) >>
+			TSNEP_RX_STATISTIC_INVALID_FRAME_SHIFT;
+		memcpy(data, &tsnep_rx_queue_stats,
+		       sizeof(tsnep_rx_queue_stats));
+		data += TSNEP_RX_QUEUE_STATS_COUNT;
+	}
+
+	for (i = 0; i < tx_count; i++) {
+		memset(&tsnep_tx_queue_stats, 0, sizeof(tsnep_tx_queue_stats));
+		tsnep_tx_queue_stats.tx_packets += adapter->tx[i].packets;
+		tsnep_tx_queue_stats.tx_bytes += adapter->tx[i].bytes;
+		tsnep_tx_queue_stats.tx_dropped += adapter->tx[i].dropped;
+		memcpy(data, &tsnep_tx_queue_stats,
+		       sizeof(tsnep_tx_queue_stats));
+		data += TSNEP_TX_QUEUE_STATS_COUNT;
+	}
+}
+
+static int tsnep_get_sset_count(struct net_device *netdev, int sset)
+{
+	struct tsnep_adapter *adapter = netdev_priv(netdev);
+	int rx_count;
+	int tx_count;
+
+	switch (sset) {
+	case ETH_SS_STATS:
+		rx_count = adapter->num_rx_queues + adapter->stream_count;
+		tx_count = adapter->num_tx_queues + adapter->stream_count;
+		return TSNEP_STATS_COUNT +
+		       TSNEP_RX_QUEUE_STATS_COUNT * rx_count +
+		       TSNEP_TX_QUEUE_STATS_COUNT * tx_count;
+	case ETH_SS_TEST:
+		return tsnep_get_test_count();
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int tsnep_ethtool_get_ts_info(struct net_device *dev,
+				     struct ethtool_ts_info *info)
+{
+	struct tsnep_adapter *adapter = netdev_priv(dev);
+
+	info->so_timestamping = SOF_TIMESTAMPING_TX_SOFTWARE |
+				SOF_TIMESTAMPING_RX_SOFTWARE |
+				SOF_TIMESTAMPING_SOFTWARE |
+				SOF_TIMESTAMPING_TX_HARDWARE |
+				SOF_TIMESTAMPING_RX_HARDWARE |
+				SOF_TIMESTAMPING_RAW_HARDWARE;
+
+	if (adapter->ptp_clock)
+		info->phc_index = ptp_clock_index(adapter->ptp_clock);
+	else
+		info->phc_index = -1;
+
+	info->tx_types = BIT(HWTSTAMP_TX_OFF) |
+			 BIT(HWTSTAMP_TX_ON);
+	info->rx_filters = BIT(HWTSTAMP_FILTER_NONE) |
+			   BIT(HWTSTAMP_FILTER_ALL);
+
+	return 0;
+}
+
+const struct ethtool_ops tsnep_ethtool_ops = {
+	.get_drvinfo = tsnep_ethtool_get_drvinfo,
+	.get_regs_len = tsnep_get_regs_len,
+	.get_regs = tsnep_get_regs,
+	.get_msglevel = tsnep_ethtool_get_msglevel,
+	.set_msglevel = tsnep_ethtool_set_msglevel,
+	.nway_reset = phy_ethtool_nway_reset,
+	.get_link = ethtool_op_get_link,
+	.self_test = tsnep_self_test,
+	.get_strings = tsnep_get_strings,
+	.get_ethtool_stats = tsnep_get_ethtool_stats,
+	.get_sset_count = tsnep_get_sset_count,
+	.get_ts_info = tsnep_ethtool_get_ts_info,
+	.get_link_ksettings = phy_ethtool_get_link_ksettings,
+	.set_link_ksettings = phy_ethtool_set_link_ksettings,
+};
diff --git a/drivers/net/ethernet/engleder/tsnep_hw.h b/drivers/net/ethernet/engleder/tsnep_hw.h
new file mode 100644
index 000000000000..83ab4b8daf87
--- /dev/null
+++ b/drivers/net/ethernet/engleder/tsnep_hw.h
@@ -0,0 +1,276 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2021 Gerhard Engleder <gerhard@engleder-embedded.com> */
+
+/* Hardware definition of TSNEP and EtherCAT MAC device */
+
+#ifndef _TSNEP_HW_H
+#define _TSNEP_HW_H
+
+#include <linux/types.h>
+
+/* type */
+#define ECM_TYPE 0x0000
+#define ECM_REVISION_MASK 0x000000FF
+#define ECM_REVISION_SHIFT 0
+#define ECM_VERSION_MASK 0x0000FF00
+#define ECM_VERSION_SHIFT 8
+#define ECM_QUEUE_COUNT_MASK 0x00070000
+#define ECM_QUEUE_COUNT_SHIFT 16
+#define ECM_GATE_CONTROL 0x02000000
+
+/* system time */
+#define ECM_SYSTEM_TIME_LOW 0x0008
+#define ECM_SYSTEM_TIME_HIGH 0x000C
+
+/* clock */
+#define ECM_CLOCK_RATE 0x0010
+#define ECM_CLOCK_RATE_PRESET 500000000
+#define ECM_CLOCK_RATE_OFFSET_MASK 0x7FFFFFFF
+#define ECM_CLOCK_RATE_OFFSET_SIGN 0x80000000
+#define ECM_CLOCK_CONFIG 0x0014
+#define ECM_CLOCK_CONFIG_PRESET 0x50000000
+#define ECM_CLOCK_DIFF 0x0014
+
+/* interrupt */
+#define ECM_INT_ENABLE 0x0018
+#define ECM_INT_ACTIVE 0x001C
+#define ECM_INT_ACKNOWLEDGE 0x001C
+#define ECM_INT_MD 0x00000001
+#define ECM_INT_ACYCLIC 0x00000004
+#define ECM_INT_DELAY 0x00000008
+#define ECM_INT_SYNC 0x00000010
+#define ECM_INT_LINK 0x00000020
+#define ECM_INT_TX_0 0x00000100
+#define ECM_INT_RX_0 0x00000200
+
+/* reset */
+#define ECM_RESET 0x0020
+#define ECM_RESET_COMMON 0x00000001
+#define ECM_RESET_CHANNEL 0x00000100
+
+/* control and status */
+#define ECM_CONTROL 0x0080
+#define ECM_STATUS 0x0080
+#define ECM_ENABLE_CYCLIC 0x00000001
+#define ECM_ENABLE_ACYCLIC 0x00000002
+#define ECM_ENABLE_DELAY 0x00000100
+#define ECM_ENABLE_SYNC 0x00000200
+#define ECM_ENABLE_CYCLIC_RESUME 0x00000400
+#define ECM_ENABLE_FAULT_INJECTION 0x40000000
+#define ECM_DISABLE_FAULT_INJECTION 0x80000000
+#define ECM_CYCLIC_ACTIVE 0x00000001
+#define ECM_ACYCLIC_ACTIVE 0x00000002
+#define ECM_CYCLIC_DMA_ERROR 0x00000004
+#define ECM_CYCLIC_UNDERRUN_ERROR 0x00000008
+#define ECM_CYCLIC_TIMING_ERROR 0x00000010
+#define ECM_ACYCLIC_DMA_ERROR 0x00000020
+#define ECM_ACYCLIC_UNDERRUN_ERROR 0x00000040
+#define ECM_NO_LINK 0x00000080
+#define ECM_DELAY_ACTIVE 0x00000100
+#define ECM_SYNC_ACTIVE 0x00000200
+#define ECM_PHY_NO_LINK 0x01000000
+#define ECM_HALF_DUPLEX 0x02000000
+#define ECM_SPEED_MASK 0x0C000000
+#define ECM_SPEED_10 0x00000000
+#define ECM_SPEED_100 0x04000000
+#define ECM_SPEED_1000 0x08000000
+
+/* management data */
+#define ECM_MD_CONTROL 0x0084
+#define ECM_MD_STATUS 0x0084
+#define ECM_MD_PREAMBLE 0x00000001
+#define ECM_MD_READ 0x00000004
+#define ECM_MD_WRITE 0x00000002
+#define ECM_MD_ADDR_MASK 0x000000F8
+#define ECM_MD_ADDR_SHIFT 3
+#define ECM_MD_PHY_ADDR_FLAG 0x00000100
+#define ECM_MD_PHY_ADDR_MASK 0x00003E00
+#define ECM_MD_PHY_ADDR_SHIFT 9
+#define ECM_MD_BUSY 0x00000001
+#define ECM_MD_DATA_MASK 0xFFFF0000
+#define ECM_MD_DATA_SHIFT 16
+
+/* timeout */
+#define ECM_TIMEOUT 0x008C
+
+/* descriptors */
+#define ECM_CYCLIC_DESC_ADDR 0x0090
+#define ECM_CYCLIC_DMA_TIME 0x0094
+#define ECM_CYCLIC_TX_TIME 0x0098
+#define ECM_ACYCLIC_DESC_ADDR 0x00A0
+
+/* command */
+#define ECM_COMMAND_PARAM 0x00A8
+
+/* statistic */
+#define ECM_STAT 0x00B0
+#define ECM_STAT_RX_ERR_MASK 0x000000FF
+#define ECM_STAT_RX_ERR_SHIFT 0
+#define ECM_STAT_INV_FRM_MASK 0x0000FF00
+#define ECM_STAT_INV_FRM_SHIFT 8
+#define ECM_STAT_FWD_RX_ERR_MASK 0x00FF0000
+#define ECM_STAT_FWD_RX_ERR_SHIFT 16
+
+/* optional Xilinx GMII2RGMII */
+#define ECM_GMII2RGMII_BMCR 0x10
+#define ECM_GMII2RGMII_ADDR 8
+
+/* tsnep */
+#define TSNEP_MAC_SIZE 0x4000
+#define TSNEP_QUEUE_SIZE 0x1000
+#define TSNEP_QUEUE(n) ({ typeof(n) __n = (n); \
+			  (__n) == 0 ? \
+			  0 : \
+			  TSNEP_MAC_SIZE + TSNEP_QUEUE_SIZE * ((__n) - 1); })
+#define TSNEP_MAX_QUEUES 8
+#define TSNEP_MAX_FRAME_SIZE (2 * 1024) /* hardware supports actually 16k */
+#define TSNEP_DESC_SIZE 256
+#define TSNEP_DESC_OFFSET 128
+
+/* tsnep register */
+#define TSNEP_INFO 0x0100
+#define TSNEP_INFO_RX_ASSIGN 0x00010000
+#define TSNEP_INFO_TX_TIME 0x00020000
+#define TSNEP_CONTROL 0x0108
+#define TSNEP_CONTROL_TX_RESET 0x00000001
+#define TSNEP_CONTROL_TX_ENABLE 0x00000002
+#define TSNEP_CONTROL_TX_DMA_ERROR 0x00000010
+#define TSNEP_CONTROL_TX_DESC_ERROR 0x00000020
+#define TSNEP_CONTROL_RX_RESET 0x00000100
+#define TSNEP_CONTROL_RX_ENABLE 0x00000200
+#define TSNEP_CONTROL_RX_DISABLE 0x00000400
+#define TSNEP_CONTROL_RX_DMA_ERROR 0x00001000
+#define TSNEP_CONTROL_RX_DESC_ERROR 0x00002000
+#define TSNEP_TX_DESC_ADDR_LOW 0x0140
+#define TSNEP_TX_DESC_ADDR_HIGH 0x0144
+#define TSNEP_RX_DESC_ADDR_LOW 0x0180
+#define TSNEP_RX_DESC_ADDR_HIGH 0x0184
+#define TSNEP_RESET_OWNER_COUNTER 0x01
+#define TSNEP_RX_STATISTIC 0x0190
+#define TSNEP_RX_STATISTIC_NO_DESC_MASK 0x000000FF
+#define TSNEP_RX_STATISTIC_NO_DESC_SHIFT 0
+#define TSNEP_RX_STATISTIC_BUFFER_TOO_SMALL_MASK 0x0000FF00
+#define TSNEP_RX_STATISTIC_BUFFER_TOO_SMALL_SHIFT 8
+#define TSNEP_RX_STATISTIC_FIFO_OVERFLOW_MASK 0x00FF0000
+#define TSNEP_RX_STATISTIC_FIFO_OVERFLOW_SHIFT 16
+#define TSNEP_RX_STATISTIC_INVALID_FRAME_MASK 0xFF000000
+#define TSNEP_RX_STATISTIC_INVALID_FRAME_SHIFT 24
+#define TSNEP_RX_STATISTIC_NO_DESC 0x0190
+#define TSNEP_RX_STATISTIC_BUFFER_TOO_SMALL 0x0191
+#define TSNEP_RX_STATISTIC_FIFO_OVERFLOW 0x0192
+#define TSNEP_RX_STATISTIC_INVALID_FRAME 0x0193
+#define TSNEP_RX_ASSIGN 0x01A0
+#define TSNEP_RX_ASSIGN_ETHER_TYPE_ACTIVE 0x00000001
+#define TSNEP_RX_ASSIGN_ETHER_TYPE_MASK 0xFFFF0000
+#define TSNEP_RX_ASSIGN_ETHER_TYPE_SHIFT 16
+#define TSNEP_MAC_ADDRESS_LOW 0x0800
+#define TSNEP_MAC_ADDRESS_HIGH 0x0804
+#define TSNEP_RX_FILTER 0x0806
+#define TSNEP_RX_FILTER_ACCEPT_ALL_MULTICASTS 0x0001
+#define TSNEP_RX_FILTER_ACCEPT_ALL_UNICASTS 0x0002
+#define TSNEP_GC 0x0808
+#define TSNEP_GC_ENABLE_A 0x00000002
+#define TSNEP_GC_ENABLE_B 0x00000004
+#define TSNEP_GC_DISABLE 0x00000008
+#define TSNEP_GC_ENABLE_TIMEOUT 0x00000010
+#define TSNEP_GC_ACTIVE_A 0x00000002
+#define TSNEP_GC_ACTIVE_B 0x00000004
+#define TSNEP_GC_CHANGE_AB 0x00000008
+#define TSNEP_GC_TIMEOUT_ACTIVE 0x00000010
+#define TSNEP_GC_TIMEOUT_SIGNAL 0x00000020
+#define TSNEP_GC_LIST_ERROR 0x00000080
+#define TSNEP_GC_OPEN 0x00FF0000
+#define TSNEP_GC_OPEN_SHIFT 16
+#define TSNEP_GC_NEXT_OPEN 0xFF000000
+#define TSNEP_GC_NEXT_OPEN_SHIFT 24
+#define TSNEP_GC_TIMEOUT 131072
+#define TSNEP_GC_TIME 0x080C
+#define TSNEP_GC_CHANGE 0x0810
+#define TSNEP_GCL_A 0x2000
+#define TSNEP_GCL_B 0x2800
+#define TSNEP_GCL_SIZE SZ_2K
+
+/* tsnep gate control list operation */
+struct tsnep_gcl_operation {
+	u32 properties;
+	u32 interval;
+};
+
+#define TSNEP_GCL_COUNT (TSNEP_GCL_SIZE / sizeof(struct tsnep_gcl_operation))
+#define TSNEP_GCL_MASK 0x000000FF
+#define TSNEP_GCL_INSERT 0x20000000
+#define TSNEP_GCL_CHANGE 0x40000000
+#define TSNEP_GCL_LAST 0x80000000
+#define TSNEP_GCL_MIN_INTERVAL 32
+
+/* tsnep TX/RX descriptor */
+#define TSNEP_DESC_SIZE 256
+#define TSNEP_DESC_SIZE_DATA_AFTER 2048
+#define TSNEP_DESC_OFFSET 128
+#define TSNEP_DESC_OWNER_COUNTER_MASK 0xC0000000
+#define TSNEP_DESC_OWNER_COUNTER_SHIFT 30
+#define TSNEP_DESC_LENGTH_MASK 0x00003FFF
+#define TSNEP_DESC_INTERRUPT_FLAG 0x00040000
+#define TSNEP_DESC_EXTENDED_WRITEBACK_FLAG 0x00080000
+#define TSNEP_DESC_NO_LINK_FLAG 0x01000000
+#define TSNEP_DESC_HALF_DUPLEX_FLAG 0x02000000
+#define TSNEP_DESC_SPEED_MASK 0x0C000000
+#define TSNEP_DESC_SPEED_10 0x00000000
+#define TSNEP_DESC_SPEED_100 0x04000000
+#define TSNEP_DESC_SPEED_1000 0x08000000
+
+/* tsnep TX descriptor */
+struct tsnep_tx_desc {
+	u32 properties;
+	u32 more_properties;
+	u32 reserved[2];
+	u64 next;
+	u64 tx;
+};
+
+#define TSNEP_TX_DESC_OWNER_MASK 0xE0000000
+#define TSNEP_TX_DESC_OWNER_USER_FLAG 0x20000000
+#define TSNEP_TX_DESC_LAST_FRAGMENT_FLAG 0x00010000
+#define TSNEP_TX_DESC_DATA_AFTER_DESC_FLAG 0x00020000
+
+/* tsnep TX descriptor writeback */
+struct tsnep_tx_desc_wb {
+	u32 properties;
+	u32 reserved1[3];
+	u64 timestamp;
+	u32 dma_delay;
+	u32 reserved2;
+};
+
+#define TSNEP_TX_DESC_UNDERRUN_ERROR_FLAG 0x00010000
+#define TSNEP_TX_DESC_DMA_DELAY_FIRST_DATA_MASK 0x0000FFFC
+#define TSNEP_TX_DESC_DMA_DELAY_FIRST_DATA_SHIFT 2
+#define TSNEP_TX_DESC_DMA_DELAY_LAST_DATA_MASK 0xFFFC0000
+#define TSNEP_TX_DESC_DMA_DELAY_LAST_DATA_SHIFT 18
+#define TSNEP_TX_DESC_DMA_DELAY_NS 64
+
+/* tsnep RX descriptor */
+struct tsnep_rx_desc {
+	u32 properties;
+	u32 reserved[3];
+	u64 next;
+	u64 rx;
+};
+
+#define TSNEP_RX_DESC_BUFFER_SIZE_MASK 0x00003FFC
+
+/* tsnep RX descriptor writeback */
+struct tsnep_rx_desc_wb {
+	u32 properties;
+	u32 reserved[7];
+};
+
+/* tsnep RX inline meta */
+struct tsnep_rx_inline {
+	u64 reserved;
+	u64 timestamp;
+};
+
+#define TSNEP_RX_INLINE_METADATA_SIZE (sizeof(struct tsnep_rx_inline))
+
+#endif /* _TSNEP_HW_H */
diff --git a/drivers/net/ethernet/engleder/tsnep_main.c b/drivers/net/ethernet/engleder/tsnep_main.c
new file mode 100644
index 000000000000..ce8e64663449
--- /dev/null
+++ b/drivers/net/ethernet/engleder/tsnep_main.c
@@ -0,0 +1,1418 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2021 Gerhard Engleder <gerhard@engleder-embedded.com> */
+
+/* TSN endpoint Ethernet MAC driver
+ *
+ * The TSN endpoint Ethernet MAC is a FPGA based network device for real-time
+ * communication. It is designed for endpoints within TSN (Time Sensitive
+ * Networking) networks; e.g., for PLCs in the industrial automation case.
+ *
+ * It supports multiple TX/RX queue pairs. The first TX/RX queue pair is used
+ * by the driver. All other TX/RX queue pairs shall be used directly by
+ * real-time applications. Every TX/RX queue pairs has its own register set
+ * within a separate physical page. Thus, they are strictly separated from
+ * each other and can be operated without any synchronisation with the driver
+ * or any other TX/RX queue pair. tsnep_stream.c implements an interface for
+ * those TX/RX queue pairs. The real-time applications which use the TX/RX
+ * queue pairs can run in user space or on a dedicated CPU core with or without
+ * an operating system.
+ *
+ * More information can be found here:
+ * - www.embedded-experts.at/tsn
+ * - www.engleder-embedded.com
+ */
+
+#include "tsnep.h"
+#include "tsnep_hw.h"
+
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_net.h>
+#include <linux/of_mdio.h>
+#include <linux/interrupt.h>
+#include <linux/etherdevice.h>
+#include <linux/phy.h>
+#include <linux/iopoll.h>
+
+#define RX_SKB_LENGTH (round_up(TSNEP_RX_INLINE_METADATA_SIZE + ETH_HLEN + \
+				TSNEP_MAX_FRAME_SIZE + ETH_FCS_LEN, 4))
+#define RX_SKB_RESERVE ((16 - TSNEP_RX_INLINE_METADATA_SIZE) + NET_IP_ALIGN)
+#define RX_SKB_ALLOC_LENGTH (RX_SKB_RESERVE + RX_SKB_LENGTH)
+
+#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
+#define DMA_ADDR_HIGH(dma_addr) ((u32)(((dma_addr) >> 32) & 0xFFFFFFFF))
+#else
+#define DMA_ADDR_HIGH(dma_addr) ((u32)(0))
+#endif
+#define DMA_ADDR_LOW(dma_addr) ((u32)((dma_addr) & 0xFFFFFFFF))
+
+int tsnep_read_md(struct tsnep_adapter *adapter, int phy, int reg, u16 *data)
+{
+	u32 md;
+	int retval = 0;
+
+	if (mutex_lock_interruptible(&adapter->md_lock) != 0)
+		return -ERESTARTSYS;
+
+	/* management data frame without preamble */
+	md = ECM_MD_READ;
+	md |= (reg << ECM_MD_ADDR_SHIFT) & ECM_MD_ADDR_MASK;
+	if (phy != -1) {
+		md |= ECM_MD_PHY_ADDR_FLAG;
+		md |= (phy << ECM_MD_PHY_ADDR_SHIFT) & ECM_MD_PHY_ADDR_MASK;
+	}
+	adapter->md_active = true;
+	iowrite32(md, adapter->addr + ECM_MD_CONTROL);
+	retval = wait_event_interruptible(adapter->md_wait,
+					  !adapter->md_active);
+	if (retval == 0) {
+		md = ioread32(adapter->addr + ECM_MD_STATUS);
+		if ((md & ECM_MD_BUSY) == 0) {
+			*data = (md & ECM_MD_DATA_MASK) >> ECM_MD_DATA_SHIFT;
+			retval = 0;
+		} else {
+			retval = -EIO;
+		}
+	}
+
+	mutex_unlock(&adapter->md_lock);
+
+	return retval;
+}
+
+int tsnep_write_md(struct tsnep_adapter *adapter, int phy, int reg, u16 data)
+{
+	u32 md;
+	int retval = 0;
+
+	if (mutex_lock_interruptible(&adapter->md_lock) != 0)
+		return -ERESTARTSYS;
+
+	/* management data frame without preamble */
+	md = ECM_MD_WRITE;
+	md |= (reg << ECM_MD_ADDR_SHIFT) & ECM_MD_ADDR_MASK;
+	if (phy != -1) {
+		md |= ECM_MD_PHY_ADDR_FLAG;
+		md |= (phy << ECM_MD_PHY_ADDR_SHIFT) & ECM_MD_PHY_ADDR_MASK;
+	}
+	md |= ((u32)data << ECM_MD_DATA_SHIFT) & ECM_MD_DATA_MASK;
+	adapter->md_active = true;
+	iowrite32(md, adapter->addr + ECM_MD_CONTROL);
+	retval = wait_event_interruptible(adapter->md_wait,
+					  !adapter->md_active);
+	if (retval == 0) {
+		md = ioread32(adapter->addr + ECM_MD_STATUS);
+		if ((md & ECM_MD_BUSY) == 0)
+			retval = 0;
+		else
+			retval = -EIO;
+	}
+
+	mutex_unlock(&adapter->md_lock);
+
+	return retval;
+}
+
+int tsnep_enable_loopback(struct tsnep_adapter *adapter, int speed)
+{
+	int phy_address = adapter->phydev->mdio.addr;
+	u16 val;
+	int retval;
+
+	adapter->loopback = true;
+	adapter->loopback_speed = speed;
+
+	retval = tsnep_read_md(adapter, phy_address, MII_BMCR, &val);
+	if (retval)
+		return retval;
+	if (speed == 1000) {
+		val &= ~(BMCR_ANENABLE | BMCR_SPEED100);
+		val |= BMCR_LOOPBACK | BMCR_FULLDPLX | BMCR_SPEED1000;
+	} else {
+		val &= ~(BMCR_ANENABLE | BMCR_SPEED1000);
+		val |= BMCR_LOOPBACK | BMCR_SPEED100 | BMCR_FULLDPLX;
+	}
+	retval = tsnep_write_md(adapter, phy_address, MII_BMCR, val);
+	if (retval)
+		return retval;
+
+	if (speed == 1000) {
+		retval = tsnep_read_md(adapter, phy_address,
+				       MII_CTRL1000, &val);
+		if (retval)
+			return retval;
+		val &= ~CTL1000_AS_MASTER;
+		val |= CTL1000_ENABLE_MASTER;
+		retval = tsnep_write_md(adapter, phy_address,
+					MII_CTRL1000, val);
+		if (retval)
+			return retval;
+	}
+
+	if (adapter->gmii2rgmii) {
+		if (speed == 1000)
+			val = BMCR_SPEED1000;
+		else
+			val = BMCR_SPEED100;
+		retval = tsnep_write_md(adapter, ECM_GMII2RGMII_ADDR,
+					ECM_GMII2RGMII_BMCR, val);
+		if (retval)
+			return retval;
+	}
+
+	/* wait for loopback link */
+	do {
+		retval = tsnep_read_md(adapter, phy_address, MII_BMSR, &val);
+		if (retval)
+			return retval;
+	} while (!(val & BMSR_LSTATUS));
+
+	return 0;
+}
+
+int tsnep_disable_loopback(struct tsnep_adapter *adapter)
+{
+	int phy_address = adapter->phydev->mdio.addr;
+	u16 val;
+	int retval;
+
+	retval = tsnep_read_md(adapter, phy_address, MII_BMCR, &val);
+	if (retval)
+		return retval;
+	val &= ~(BMCR_LOOPBACK | BMCR_SPEED1000);
+	val |=  BMCR_SPEED100 | BMCR_ANENABLE | BMCR_FULLDPLX;
+	retval = tsnep_write_md(adapter, phy_address, MII_BMCR, val);
+	if (retval)
+		return retval;
+
+	retval = tsnep_read_md(adapter, phy_address, MII_CTRL1000, &val);
+	if (retval)
+		return retval;
+	val &= ~(CTL1000_ENABLE_MASTER | CTL1000_AS_MASTER);
+	retval = tsnep_write_md(adapter, phy_address, MII_CTRL1000, val);
+	if (retval)
+		return retval;
+
+	adapter->loopback = false;
+	adapter->loopback_speed = 0;
+
+	return 0;
+}
+
+void tsnep_enable_irq(struct tsnep_adapter *adapter, u32 mask)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&adapter->irq_lock, flags);
+	adapter->irq_enable |= mask;
+	iowrite32(adapter->irq_enable, adapter->addr + ECM_INT_ENABLE);
+	spin_unlock_irqrestore(&adapter->irq_lock, flags);
+}
+
+void tsnep_disable_irq(struct tsnep_adapter *adapter, u32 mask)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&adapter->irq_lock, flags);
+	adapter->irq_enable &= ~mask;
+	iowrite32(adapter->irq_enable, adapter->addr + ECM_INT_ENABLE);
+	spin_unlock_irqrestore(&adapter->irq_lock, flags);
+}
+
+static irqreturn_t tsnep_irq(int irq, void *arg)
+{
+	struct tsnep_adapter *adapter = arg;
+	u32 active = ioread32(adapter->addr + ECM_INT_ACTIVE);
+
+	/* acknowledge interrupt */
+	if (active != 0)
+		iowrite32(active, adapter->addr + ECM_INT_ACKNOWLEDGE);
+
+	/* handle management data interrupt */
+	if ((active & ECM_INT_MD) != 0) {
+		adapter->md_active = false;
+		wake_up_interruptible(&adapter->md_wait);
+	}
+
+	/* handle link interrupt */
+	if ((active & ECM_INT_LINK) != 0) {
+		if (adapter->netdev->phydev) {
+			struct phy_device *phydev = adapter->netdev->phydev;
+			u32 status = ioread32(adapter->addr + ECM_STATUS);
+			int link = (status & ECM_NO_LINK) ? 0 : 1;
+			u32 speed = status & ECM_SPEED_MASK;
+
+			if (speed != ECM_SPEED_100 &&
+			    speed != ECM_SPEED_1000)
+				link = 0;
+
+			if (!(link == 0 && phydev->link == 0))
+				phy_mac_interrupt(phydev);
+		}
+	}
+
+	/* handle TX/RX queue 0 interrupt */
+	if ((active & (ECM_INT_TX_0 | ECM_INT_RX_0)) != 0) {
+		if (adapter->netdev) {
+			tsnep_disable_irq(adapter, ECM_INT_TX_0 | ECM_INT_RX_0);
+			napi_schedule(&adapter->napi);
+		}
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int tsnep_mdiobus_read(struct mii_bus *bus, int addr, int regnum)
+{
+	struct tsnep_adapter *adapter = bus->priv;
+	u16 data;
+	int retval;
+
+	if (adapter->loopback)
+		return 0;
+
+	retval = tsnep_read_md(adapter, addr, regnum, &data);
+	if (retval != 0)
+		return retval;
+
+	return data;
+}
+
+static int tsnep_mdiobus_write(struct mii_bus *bus, int addr, int regnum,
+			       u16 val)
+{
+	struct tsnep_adapter *adapter = bus->priv;
+
+	if (adapter->loopback)
+		return 0;
+
+	return tsnep_write_md(adapter, addr, regnum, val);
+}
+
+static void tsnep_phy_link_status_change(struct net_device *netdev)
+{
+	struct tsnep_adapter *adapter = netdev_priv(netdev);
+	struct phy_device *phydev = netdev->phydev;
+
+	if (adapter->loopback)
+		return;
+
+	if (adapter->gmii2rgmii) {
+		u16 val;
+
+		if (phydev->link && phydev->speed == 1000)
+			val = BMCR_SPEED1000;
+		else
+			val = BMCR_SPEED100;
+		tsnep_write_md(adapter, ECM_GMII2RGMII_ADDR,
+			       ECM_GMII2RGMII_BMCR, val);
+	}
+
+	phy_print_status(phydev);
+}
+
+static int tsnep_phy_open(struct tsnep_adapter *adapter)
+{
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(mask);
+	struct ethtool_eee ethtool_eee;
+	int retval;
+
+	retval = phy_connect_direct(adapter->netdev, adapter->phydev,
+				    tsnep_phy_link_status_change,
+				    adapter->phy_mode);
+	if (retval)
+		return -EIO;
+
+	/* MAC supports only 100Mbps|1000Mbps full duplex
+	 * SPE (Single Pair Ethernet) is also an option but not implemented yet
+	 */
+	linkmode_zero(mask);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, mask);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, mask);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, mask);
+	linkmode_and(mask, adapter->phydev->supported, mask);
+	linkmode_copy(adapter->phydev->supported, mask);
+	linkmode_copy(adapter->phydev->advertising, mask);
+
+	/* disable EEE autoneg, EEE not supported by TSNEP */
+	memset(&ethtool_eee, 0, sizeof(ethtool_eee));
+	phy_ethtool_set_eee(adapter->phydev, &ethtool_eee);
+
+	adapter->phydev->irq = PHY_MAC_INTERRUPT;
+	phy_start(adapter->phydev);
+	phy_start_aneg(adapter->phydev);
+
+	return 0;
+}
+
+static void tsnep_phy_close(struct tsnep_adapter *adapter)
+{
+	phy_stop(adapter->netdev->phydev);
+	phy_disconnect(adapter->netdev->phydev);
+	adapter->netdev->phydev = NULL;
+}
+
+static void tsnep_tx_ring_cleanup(struct tsnep_tx *tx)
+{
+	struct device *dev = &tx->adapter->pdev->dev;
+	int i;
+
+	memset(tx->entry, 0, sizeof(tx->entry));
+
+	for (i = 0; i < TSNEP_RING_PAGE_COUNT; i++) {
+		if (tx->page[i]) {
+			dma_free_coherent(dev, PAGE_SIZE, tx->page[i],
+					  tx->page_dma[i]);
+			tx->page[i] = NULL;
+			tx->page_dma[i] = 0;
+		}
+	}
+}
+
+static int tsnep_tx_ring_init(struct tsnep_tx *tx)
+{
+	struct device *dev = &tx->adapter->pdev->dev;
+	struct tsnep_tx_entry *entry;
+	struct tsnep_tx_entry *next_entry;
+	int i, j;
+	int retval;
+
+	for (i = 0; i < TSNEP_RING_PAGE_COUNT; i++) {
+		tx->page[i] =
+			dma_alloc_coherent(dev, PAGE_SIZE, &tx->page_dma[i],
+					   GFP_KERNEL);
+		if (!tx->page[i]) {
+			retval = -ENOMEM;
+			goto alloc_failed;
+		}
+		for (j = 0; j < TSNEP_RING_ENTRIES_PER_PAGE; j++) {
+			entry = &tx->entry[TSNEP_RING_ENTRIES_PER_PAGE * i + j];
+			entry->desc_wb = (struct tsnep_tx_desc_wb *)
+				(((u8 *)tx->page[i]) + TSNEP_DESC_SIZE * j);
+			entry->desc = (struct tsnep_tx_desc *)
+				(((u8 *)entry->desc_wb) + TSNEP_DESC_OFFSET);
+			entry->desc_dma = tx->page_dma[i] + TSNEP_DESC_SIZE * j;
+		}
+	}
+	for (i = 0; i < TSNEP_RING_SIZE; i++) {
+		entry = &tx->entry[i];
+		next_entry = &tx->entry[(i + 1) % TSNEP_RING_SIZE];
+		entry->desc->next = next_entry->desc_dma;
+	}
+
+	return 0;
+
+alloc_failed:
+	tsnep_tx_ring_cleanup(tx);
+	return retval;
+}
+
+static void tsnep_tx_activate(struct tsnep_tx *tx, int index, bool last)
+{
+	struct tsnep_tx_entry *entry = &tx->entry[index];
+
+	entry->properties = 0;
+	if (entry->skb) {
+		entry->properties =
+			skb_pagelen(entry->skb) & TSNEP_DESC_LENGTH_MASK;
+		entry->properties |= TSNEP_DESC_INTERRUPT_FLAG;
+		if (skb_shinfo(entry->skb)->tx_flags & SKBTX_IN_PROGRESS)
+			entry->properties |= TSNEP_DESC_EXTENDED_WRITEBACK_FLAG;
+
+		/* toggle user flag to prevent false acknowledge
+		 *
+		 * Only the first fragment is acknowledged. For all other
+		 * fragments no acknowledge is done and the last written owner
+		 * counter stays in the writeback descriptor. Therefore, it is
+		 * possible that the last written owner counter is identical to
+		 * the new incremented owner counter and a false acknowledge is
+		 * detected before the real acknowledge has been done by
+		 * hardware.
+		 *
+		 * The user flag is used to prevent this situation. The user
+		 * flag is copied to the writeback descriptor by the hardware
+		 * and is used as additional acknowledge data. By toggeling the
+		 * user flag only for the first fragment (which is
+		 * acknowledged), it is guaranteed that the last acknowledge
+		 * done for this descriptor has used a different user flag and
+		 * cannot be detected as false acknowledge.
+		 */
+		entry->owner_user_flag = !entry->owner_user_flag;
+	}
+	if (last)
+		entry->properties |= TSNEP_TX_DESC_LAST_FRAGMENT_FLAG;
+	if (index == tx->increment_owner_counter) {
+		tx->owner_counter++;
+		if (tx->owner_counter == 4)
+			tx->owner_counter = 1;
+		tx->increment_owner_counter--;
+		if (tx->increment_owner_counter < 0)
+			tx->increment_owner_counter = TSNEP_RING_SIZE - 1;
+	}
+	entry->properties |=
+		(tx->owner_counter << TSNEP_DESC_OWNER_COUNTER_SHIFT) &
+		TSNEP_DESC_OWNER_COUNTER_MASK;
+	if (entry->owner_user_flag)
+		entry->properties |= TSNEP_TX_DESC_OWNER_USER_FLAG;
+	entry->desc->more_properties = entry->len & TSNEP_DESC_LENGTH_MASK;
+
+	dma_wmb();
+
+	entry->desc->properties = entry->properties;
+}
+
+static int tsnep_tx_desc_available(struct tsnep_tx *tx)
+{
+	if (tx->read <= tx->write)
+		return TSNEP_RING_SIZE - tx->write + tx->read - 1;
+	else
+		return tx->read - tx->write - 1;
+}
+
+static int tsnep_tx_map(struct sk_buff *skb, struct tsnep_tx *tx, int count)
+{
+	struct device *dev = &tx->adapter->pdev->dev;
+	struct tsnep_tx_entry *entry;
+	unsigned int len;
+	dma_addr_t dma;
+	int i;
+
+	for (i = 0; i < count; i++) {
+		entry = &tx->entry[(tx->write + i) % TSNEP_RING_SIZE];
+
+		if (i == 0) {
+			len = skb_headlen(skb);
+			dma = dma_map_single(dev, skb->data, len,
+					     DMA_TO_DEVICE);
+		} else {
+			len = skb_frag_size(&skb_shinfo(skb)->frags[i - 1]);
+			dma = skb_frag_dma_map(dev,
+					       &skb_shinfo(skb)->frags[i - 1],
+					       0, len, DMA_TO_DEVICE);
+		}
+		if (dma_mapping_error(dev, dma))
+			return -ENOMEM;
+
+		dma_unmap_len_set(entry, len, len);
+		dma_unmap_addr_set(entry, dma, dma);
+
+		entry->desc->tx = dma;
+	}
+
+	return 0;
+}
+
+static void tsnep_tx_unmap(struct tsnep_tx *tx, int count)
+{
+	struct device *dev = &tx->adapter->pdev->dev;
+	struct tsnep_tx_entry *entry;
+	int i;
+
+	for (i = 0; i < count; i++) {
+		entry = &tx->entry[(tx->read + i) % TSNEP_RING_SIZE];
+
+		if (dma_unmap_len(entry, len)) {
+			if (i == 0)
+				dma_unmap_single(dev,
+						 dma_unmap_addr(entry, dma),
+						 dma_unmap_len(entry, len),
+						 DMA_TO_DEVICE);
+			else
+				dma_unmap_page(dev,
+					       dma_unmap_addr(entry, dma),
+					       dma_unmap_len(entry, len),
+					       DMA_TO_DEVICE);
+			dma_unmap_len_set(entry, len, 0);
+		}
+	}
+}
+
+static netdev_tx_t tsnep_xmit_frame_ring(struct sk_buff *skb,
+					 struct tsnep_tx *tx)
+{
+	unsigned long flags;
+	int count = 1;
+	struct tsnep_tx_entry *entry;
+	int i;
+	int retval;
+
+	if (skb_shinfo(skb)->nr_frags > 0)
+		count += skb_shinfo(skb)->nr_frags;
+
+	spin_lock_irqsave(&tx->lock, flags);
+
+	if (tsnep_tx_desc_available(tx) < count) {
+		/* ring full, shall not happen because queue is stopped if full
+		 * below
+		 */
+		netif_stop_queue(tx->adapter->netdev);
+
+		spin_unlock_irqrestore(&tx->lock, flags);
+
+		return NETDEV_TX_BUSY;
+	}
+
+	entry = &tx->entry[tx->write];
+	entry->skb = skb;
+
+	retval = tsnep_tx_map(skb, tx, count);
+	if (retval != 0) {
+		tsnep_tx_unmap(tx, count);
+		dev_kfree_skb_any(entry->skb);
+		entry->skb = NULL;
+
+		tx->dropped++;
+
+		spin_unlock_irqrestore(&tx->lock, flags);
+
+		netdev_err(tx->adapter->netdev, "TX DMA map failed\n");
+
+		return NETDEV_TX_OK;
+	}
+
+	if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)
+		skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
+
+	for (i = 0; i < count; i++)
+		tsnep_tx_activate(tx, (tx->write + i) % TSNEP_RING_SIZE,
+				  i == (count - 1));
+	skb_tx_timestamp(skb);
+
+	/* entry->properties shall be valid before write pointer is
+	 * incrememted
+	 */
+	wmb();
+	tx->write = (tx->write + count) % TSNEP_RING_SIZE;
+
+	iowrite32(TSNEP_CONTROL_TX_ENABLE, tx->addr + TSNEP_CONTROL);
+
+	if (tsnep_tx_desc_available(tx) < (MAX_SKB_FRAGS + 1)) {
+		/* ring can get full with next frame */
+		netif_stop_queue(tx->adapter->netdev);
+	}
+
+	tx->packets++;
+	tx->bytes += skb_pagelen(entry->skb) + ETH_FCS_LEN;
+
+	spin_unlock_irqrestore(&tx->lock, flags);
+
+	return NETDEV_TX_OK;
+}
+
+static bool tsnep_tx_napi_poll(struct tsnep_tx *tx, int napi_budget)
+{
+	unsigned long flags;
+	int budget = 128;
+	struct tsnep_tx_entry *entry;
+	int count;
+
+	spin_lock_irqsave(&tx->lock, flags);
+
+	do {
+		if (tx->read == tx->write)
+			break;
+
+		entry = &tx->entry[tx->read];
+		if ((entry->desc_wb->properties &
+		     TSNEP_TX_DESC_OWNER_MASK) !=
+		    (entry->properties & TSNEP_TX_DESC_OWNER_MASK))
+			break;
+
+		dma_rmb();
+
+		count = 1;
+		if (skb_shinfo(entry->skb)->nr_frags > 0)
+			count += skb_shinfo(entry->skb)->nr_frags;
+
+		tsnep_tx_unmap(tx, count);
+
+		if ((skb_shinfo(entry->skb)->tx_flags & SKBTX_IN_PROGRESS) &&
+		    (entry->desc_wb->properties &
+		     TSNEP_DESC_EXTENDED_WRITEBACK_FLAG)) {
+			struct skb_shared_hwtstamps hwtstamps;
+
+			memset(&hwtstamps, 0, sizeof(hwtstamps));
+			hwtstamps.hwtstamp =
+				ns_to_ktime(entry->desc_wb->timestamp);
+
+			skb_tstamp_tx(entry->skb, &hwtstamps);
+		}
+
+		napi_consume_skb(entry->skb, budget);
+		entry->skb = NULL;
+
+		/* descriptor shall be free before read pointer is incremented
+		 */
+		wmb();
+
+		tx->read = (tx->read + count) % TSNEP_RING_SIZE;
+
+		budget--;
+	} while (likely(budget));
+
+	if ((tsnep_tx_desc_available(tx) >= ((MAX_SKB_FRAGS + 1) * 2)) &&
+	    netif_queue_stopped(tx->adapter->netdev)) {
+		netif_wake_queue(tx->adapter->netdev);
+	}
+
+	spin_unlock_irqrestore(&tx->lock, flags);
+
+	return (budget != 0);
+}
+
+static int tsnep_tx_open(struct tsnep_adapter *adapter, struct tsnep_tx *tx,
+			 void *addr)
+{
+	dma_addr_t dma;
+	int retval;
+
+	memset(tx, 0, sizeof(*tx));
+	tx->adapter = adapter;
+	tx->addr = addr;
+
+	retval = tsnep_tx_ring_init(tx);
+	if (retval)
+		return retval;
+
+	dma = tx->entry[0].desc_dma | TSNEP_RESET_OWNER_COUNTER;
+	iowrite32(DMA_ADDR_LOW(dma), tx->addr + TSNEP_TX_DESC_ADDR_LOW);
+	iowrite32(DMA_ADDR_HIGH(dma), tx->addr + TSNEP_TX_DESC_ADDR_HIGH);
+	tx->owner_counter = 1;
+	tx->increment_owner_counter = TSNEP_RING_SIZE - 1;
+
+	spin_lock_init(&tx->lock);
+
+	return 0;
+}
+
+static void tsnep_tx_close(struct tsnep_tx *tx)
+{
+	u32 val;
+
+	readx_poll_timeout(ioread32, tx->addr + TSNEP_CONTROL, val,
+			   ((val & TSNEP_CONTROL_TX_ENABLE) == 0), 10000,
+			   1000000);
+
+	tsnep_tx_ring_cleanup(tx);
+}
+
+static void tsnep_rx_ring_cleanup(struct tsnep_rx *rx)
+{
+	struct device *dev = &rx->adapter->pdev->dev;
+	struct tsnep_rx_entry *entry;
+	int i;
+
+	for (i = 0; i < TSNEP_RING_SIZE; i++) {
+		entry = &rx->entry[i];
+		if (entry->dma)
+			dma_unmap_single(dev, entry->dma, entry->len,
+					 DMA_FROM_DEVICE);
+		if (entry->skb)
+			dev_kfree_skb(entry->skb);
+	}
+
+	memset(rx->entry, 0, sizeof(rx->entry));
+
+	for (i = 0; i < TSNEP_RING_PAGE_COUNT; i++) {
+		if (rx->page[i]) {
+			dma_free_coherent(dev, PAGE_SIZE, rx->page[i],
+					  rx->page_dma[i]);
+			rx->page[i] = NULL;
+			rx->page_dma[i] = 0;
+		}
+	}
+}
+
+static int tsnep_rx_alloc_and_map_skb(struct tsnep_rx *rx,
+				      struct tsnep_rx_entry *entry)
+{
+	struct device *dev = &rx->adapter->pdev->dev;
+	struct sk_buff *skb;
+	dma_addr_t dma;
+
+	skb = __netdev_alloc_skb(rx->adapter->netdev, RX_SKB_ALLOC_LENGTH,
+				 GFP_ATOMIC | GFP_DMA);
+	if (!skb)
+		return -ENOMEM;
+
+	skb_reserve(skb, RX_SKB_RESERVE);
+
+	dma = dma_map_single(dev, skb->data, RX_SKB_LENGTH,
+			     DMA_FROM_DEVICE);
+	if (dma_mapping_error(dev, dma)) {
+		dev_kfree_skb(skb);
+		return -ENOMEM;
+	}
+
+	entry->skb = skb;
+	dma_unmap_len_set(entry, len, RX_SKB_LENGTH);
+	dma_unmap_addr_set(entry, dma, dma);
+	entry->desc->rx = dma;
+
+	return 0;
+}
+
+static int tsnep_rx_ring_init(struct tsnep_rx *rx)
+{
+	struct device *dev = &rx->adapter->pdev->dev;
+	struct tsnep_rx_entry *entry;
+	struct tsnep_rx_entry *next_entry;
+	int i, j;
+	int retval;
+
+	for (i = 0; i < TSNEP_RING_PAGE_COUNT; i++) {
+		rx->page[i] =
+			dma_alloc_coherent(dev, PAGE_SIZE, &rx->page_dma[i],
+					   GFP_KERNEL);
+		if (!rx->page[i]) {
+			retval = -ENOMEM;
+			goto failed;
+		}
+		for (j = 0; j < TSNEP_RING_ENTRIES_PER_PAGE; j++) {
+			entry = &rx->entry[TSNEP_RING_ENTRIES_PER_PAGE * i + j];
+			entry->desc_wb = (struct tsnep_rx_desc_wb *)
+				(((u8 *)rx->page[i]) + TSNEP_DESC_SIZE * j);
+			entry->desc = (struct tsnep_rx_desc *)
+				(((u8 *)entry->desc_wb) + TSNEP_DESC_OFFSET);
+			entry->desc_dma = rx->page_dma[i] + TSNEP_DESC_SIZE * j;
+		}
+	}
+	for (i = 0; i < TSNEP_RING_SIZE; i++) {
+		entry = &rx->entry[i];
+		next_entry = &rx->entry[(i + 1) % TSNEP_RING_SIZE];
+		entry->desc->next = next_entry->desc_dma;
+
+		retval = tsnep_rx_alloc_and_map_skb(rx, entry);
+		if (retval)
+			goto failed;
+	}
+
+	return 0;
+
+failed:
+	tsnep_rx_ring_cleanup(rx);
+	return retval;
+}
+
+static void tsnep_rx_activate(struct tsnep_rx *rx, int index)
+{
+	struct tsnep_rx_entry *entry = &rx->entry[index];
+
+	/* RX_SKB_LENGTH is a multiple of 4 */
+	entry->properties = entry->len & TSNEP_DESC_LENGTH_MASK;
+	entry->properties |= TSNEP_DESC_INTERRUPT_FLAG;
+	if (index == rx->increment_owner_counter) {
+		rx->owner_counter++;
+		if (rx->owner_counter == 4)
+			rx->owner_counter = 1;
+		rx->increment_owner_counter--;
+		if (rx->increment_owner_counter < 0)
+			rx->increment_owner_counter = TSNEP_RING_SIZE - 1;
+	}
+	entry->properties |=
+		(rx->owner_counter << TSNEP_DESC_OWNER_COUNTER_SHIFT) &
+		TSNEP_DESC_OWNER_COUNTER_MASK;
+
+	dma_wmb();
+
+	entry->desc->properties = entry->properties;
+}
+
+static int tsnep_rx_napi_poll(struct napi_struct *napi, int budget)
+{
+	struct tsnep_adapter *adapter = container_of(napi, struct tsnep_adapter,
+						     napi);
+	struct tsnep_rx *rx = &adapter->rx[0];
+	struct tsnep_tx *tx = &adapter->tx[0];
+	struct device *dev = &adapter->pdev->dev;
+	bool complete;
+	int done = 0;
+	struct tsnep_rx_entry *entry;
+	struct sk_buff *skb;
+	DEFINE_DMA_UNMAP_ADDR(dma);
+	DEFINE_DMA_UNMAP_LEN(len);
+	int length;
+	int retval;
+
+	complete = tsnep_tx_napi_poll(tx, budget);
+
+	while (likely(done < budget)) {
+		entry = &rx->entry[rx->read];
+		if ((entry->desc_wb->properties &
+		     TSNEP_DESC_OWNER_COUNTER_MASK) !=
+		    (entry->properties & TSNEP_DESC_OWNER_COUNTER_MASK))
+			break;
+
+		dma_rmb();
+
+		skb = entry->skb;
+		dma = entry->dma;
+		len = entry->len;
+
+		/* forward skb only if allocation is successful, otherwise
+		 * skb is reused and frame dropped
+		 */
+		retval = tsnep_rx_alloc_and_map_skb(rx, entry);
+		if (!retval) {
+			dma_unmap_single(dev, dma, len, DMA_FROM_DEVICE);
+
+			length = entry->desc_wb->properties &
+				 TSNEP_DESC_LENGTH_MASK;
+			skb_put(skb, length - ETH_FCS_LEN);
+			if (adapter->hwtstamp_config.rx_filter ==
+			    HWTSTAMP_FILTER_ALL) {
+				struct skb_shared_hwtstamps *hwtstamps =
+					skb_hwtstamps(skb);
+				struct tsnep_rx_inline *rx_inline =
+					(struct tsnep_rx_inline *)skb->data;
+
+				memset(hwtstamps, 0, sizeof(*hwtstamps));
+				hwtstamps->hwtstamp =
+					ns_to_ktime(rx_inline->timestamp);
+			}
+			skb_pull(skb, TSNEP_RX_INLINE_METADATA_SIZE);
+			skb->protocol = eth_type_trans(skb,
+						       rx->adapter->netdev);
+
+			rx->packets++;
+			rx->bytes += length - TSNEP_RX_INLINE_METADATA_SIZE;
+			if (skb->pkt_type == PACKET_MULTICAST)
+				rx->multicast++;
+
+			napi_gro_receive(napi, skb);
+			done++;
+		} else {
+			rx->dropped++;
+		}
+
+		tsnep_rx_activate(rx, rx->read);
+		iowrite32(TSNEP_CONTROL_RX_ENABLE, rx->addr + TSNEP_CONTROL);
+
+		rx->read = (rx->read + 1) % TSNEP_RING_SIZE;
+	}
+	if (done >= budget)
+		complete = false;
+
+	/* if all work not completed, return budget and keep polling */
+	if (!complete)
+		return budget;
+
+	if (likely(napi_complete_done(napi, done)))
+		tsnep_enable_irq(rx->adapter, ECM_INT_TX_0 | ECM_INT_RX_0);
+
+	return min(done, budget - 1);
+}
+
+static int tsnep_rx_open(struct tsnep_adapter *adapter, struct tsnep_rx *rx,
+			 void *addr)
+{
+	dma_addr_t dma;
+	int i;
+	int retval;
+
+	memset(rx, 0, sizeof(*rx));
+	rx->adapter = adapter;
+	rx->addr = addr;
+
+	retval = tsnep_rx_ring_init(rx);
+	if (retval)
+		return retval;
+
+	dma = rx->entry[0].desc_dma | TSNEP_RESET_OWNER_COUNTER;
+	iowrite32(DMA_ADDR_LOW(dma), rx->addr + TSNEP_RX_DESC_ADDR_LOW);
+	iowrite32(DMA_ADDR_HIGH(dma), rx->addr + TSNEP_RX_DESC_ADDR_HIGH);
+	rx->owner_counter = 1;
+	rx->increment_owner_counter = TSNEP_RING_SIZE - 1;
+
+	for (i = 0; i < TSNEP_RING_SIZE; i++)
+		tsnep_rx_activate(rx, i);
+
+	iowrite32(TSNEP_CONTROL_RX_ENABLE, rx->addr + TSNEP_CONTROL);
+
+	return 0;
+}
+
+static void tsnep_rx_close(struct tsnep_rx *rx)
+{
+	u32 val;
+
+	iowrite32(TSNEP_CONTROL_RX_DISABLE, rx->addr + TSNEP_CONTROL);
+	readx_poll_timeout(ioread32, rx->addr + TSNEP_CONTROL, val,
+			   ((val & TSNEP_CONTROL_RX_ENABLE) == 0), 10000,
+			   1000000);
+
+	tsnep_rx_ring_cleanup(rx);
+}
+
+static int tsnep_netdev_open(struct net_device *netdev)
+{
+	struct tsnep_adapter *adapter = netdev_priv(netdev);
+	void *addr;
+	int i;
+	int retval;
+
+	retval = tsnep_phy_open(adapter);
+	if (retval)
+		return retval;
+
+	for (i = 0; i < adapter->num_tx_queues; i++) {
+		addr = adapter->addr + TSNEP_QUEUE(i);
+		retval = tsnep_tx_open(adapter, &adapter->tx[i], addr);
+		if (retval)
+			goto tx_failed;
+	}
+	retval = netif_set_real_num_tx_queues(adapter->netdev,
+					      adapter->num_tx_queues +
+					      adapter->stream_count);
+	if (retval)
+		goto tx_failed;
+	for (i = 0; i < adapter->num_rx_queues; i++) {
+		addr = adapter->addr + TSNEP_QUEUE(i);
+		retval = tsnep_rx_open(adapter, &adapter->rx[i], addr);
+		if (retval)
+			goto rx_failed;
+	}
+	retval = netif_set_real_num_rx_queues(adapter->netdev,
+					      adapter->num_rx_queues);
+	if (retval)
+		goto rx_failed;
+
+	netif_napi_add(adapter->netdev, &adapter->napi, tsnep_rx_napi_poll, 64);
+	napi_enable(&adapter->napi);
+
+	tsnep_enable_irq(adapter, ECM_INT_TX_0 | ECM_INT_RX_0);
+
+	return 0;
+
+rx_failed:
+	for (i = 0; i < adapter->num_rx_queues; i++)
+		tsnep_rx_close(&adapter->rx[i]);
+tx_failed:
+	for (i = 0; i < adapter->num_tx_queues; i++)
+		tsnep_tx_close(&adapter->tx[i]);
+	tsnep_phy_close(adapter);
+	return retval;
+}
+
+static int tsnep_netdev_close(struct net_device *netdev)
+{
+	struct tsnep_adapter *adapter = netdev_priv(netdev);
+	int i;
+
+	tsnep_disable_irq(adapter, ECM_INT_TX_0 | ECM_INT_RX_0);
+
+	napi_disable(&adapter->napi);
+	netif_napi_del(&adapter->napi);
+
+	for (i = 0; i < adapter->num_rx_queues; i++)
+		tsnep_rx_close(&adapter->rx[i]);
+	for (i = 0; i < adapter->num_tx_queues; i++)
+		tsnep_tx_close(&adapter->tx[i]);
+
+	tsnep_phy_close(adapter);
+
+	return 0;
+}
+
+static netdev_tx_t tsnep_netdev_xmit_frame(struct sk_buff *skb,
+					   struct net_device *netdev)
+{
+	struct tsnep_adapter *adapter = netdev_priv(netdev);
+	u16 queue_mapping = skb_get_queue_mapping(skb);
+
+	if (queue_mapping >= adapter->num_tx_queues)
+		queue_mapping = 0;
+
+	return tsnep_xmit_frame_ring(skb, &adapter->tx[queue_mapping]);
+}
+
+static int tsnep_netdev_ioctl(struct net_device *netdev, struct ifreq *ifr,
+			      int cmd)
+{
+	if (!netif_running(netdev))
+		return -EINVAL;
+	if (cmd == SIOCSHWTSTAMP || cmd == SIOCGHWTSTAMP)
+		return tsnep_ptp_ioctl(netdev, ifr, cmd);
+	return phy_mii_ioctl(netdev->phydev, ifr, cmd);
+}
+
+static void tsnep_netdev_set_multicast(struct net_device *netdev)
+{
+	struct tsnep_adapter *adapter = netdev_priv(netdev);
+
+	u16 rx_filter = 0;
+
+	/* configured MAC address and broadcasts are never filtered */
+	if (netdev->flags & IFF_PROMISC) {
+		rx_filter |= TSNEP_RX_FILTER_ACCEPT_ALL_MULTICASTS;
+		rx_filter |= TSNEP_RX_FILTER_ACCEPT_ALL_UNICASTS;
+	} else if (!netdev_mc_empty(netdev) || (netdev->flags & IFF_ALLMULTI)) {
+		rx_filter |= TSNEP_RX_FILTER_ACCEPT_ALL_MULTICASTS;
+	}
+	iowrite16(rx_filter, adapter->addr + TSNEP_RX_FILTER);
+}
+
+static void tsnep_netdev_get_stats64(struct net_device *netdev,
+				     struct rtnl_link_stats64 *stats)
+{
+	struct tsnep_adapter *adapter = netdev_priv(netdev);
+	u32 reg;
+	u32 val;
+	int i;
+
+	for (i = 0; i < adapter->num_tx_queues; i++) {
+		stats->tx_packets += adapter->tx[i].packets;
+		stats->tx_bytes += adapter->tx[i].bytes;
+		stats->tx_dropped += adapter->tx[i].dropped;
+	}
+	for (i = 0; i < adapter->num_rx_queues; i++) {
+		stats->rx_packets += adapter->rx[i].packets;
+		stats->rx_bytes += adapter->rx[i].bytes;
+		stats->rx_dropped += adapter->rx[i].dropped;
+		stats->multicast += adapter->rx[i].multicast;
+
+		reg = ioread32(adapter->addr + TSNEP_QUEUE(i) +
+			       TSNEP_RX_STATISTIC);
+		val = (reg & TSNEP_RX_STATISTIC_NO_DESC_MASK) >>
+		      TSNEP_RX_STATISTIC_NO_DESC_SHIFT;
+		stats->rx_dropped += val;
+		val = (reg & TSNEP_RX_STATISTIC_BUFFER_TOO_SMALL_MASK) >>
+		      TSNEP_RX_STATISTIC_BUFFER_TOO_SMALL_SHIFT;
+		stats->rx_dropped += val;
+		val = (reg & TSNEP_RX_STATISTIC_FIFO_OVERFLOW_MASK) >>
+		      TSNEP_RX_STATISTIC_FIFO_OVERFLOW_SHIFT;
+		stats->rx_errors += val;
+		stats->rx_fifo_errors += val;
+		val = (reg & TSNEP_RX_STATISTIC_INVALID_FRAME_MASK) >>
+		      TSNEP_RX_STATISTIC_INVALID_FRAME_SHIFT;
+		stats->rx_errors += val;
+		stats->rx_frame_errors += val;
+	}
+
+	reg = ioread32(adapter->addr + ECM_STAT);
+	val = (reg & ECM_STAT_RX_ERR_MASK) >> ECM_STAT_RX_ERR_SHIFT;
+	stats->rx_errors += val;
+	val = (reg & ECM_STAT_INV_FRM_MASK) >> ECM_STAT_INV_FRM_SHIFT;
+	stats->rx_errors += val;
+	stats->rx_crc_errors += val;
+	val = (reg & ECM_STAT_FWD_RX_ERR_MASK) >> ECM_STAT_FWD_RX_ERR_SHIFT;
+	stats->rx_errors += val;
+}
+
+static void tsnep_mac_set_address(struct tsnep_adapter *adapter, u8 *addr)
+{
+	iowrite32(*(u32 *)addr, adapter->addr + TSNEP_MAC_ADDRESS_LOW);
+	iowrite16(*(u16 *)(addr + sizeof(u32)),
+		  adapter->addr + TSNEP_MAC_ADDRESS_HIGH);
+
+	ether_addr_copy(adapter->mac_address, addr);
+	netif_info(adapter, drv, adapter->netdev, "MAC address set to %pM\n",
+		   addr);
+}
+
+static int tsnep_netdev_set_mac_address(struct net_device *netdev, void *addr)
+{
+	struct tsnep_adapter *adapter = netdev_priv(netdev);
+	struct sockaddr *sock_addr = addr;
+	int retval;
+
+	retval = eth_prepare_mac_addr_change(netdev, sock_addr);
+	if (retval)
+		return retval;
+	ether_addr_copy(netdev->dev_addr, sock_addr->sa_data);
+	tsnep_mac_set_address(adapter, sock_addr->sa_data);
+
+	return 0;
+}
+
+static const struct net_device_ops tsnep_netdev_ops = {
+	.ndo_open = tsnep_netdev_open,
+	.ndo_stop = tsnep_netdev_close,
+	.ndo_start_xmit = tsnep_netdev_xmit_frame,
+	.ndo_do_ioctl = tsnep_netdev_ioctl,
+	.ndo_set_rx_mode = tsnep_netdev_set_multicast,
+
+	.ndo_get_stats64 = tsnep_netdev_get_stats64,
+	.ndo_set_mac_address = tsnep_netdev_set_mac_address,
+	.ndo_setup_tc = tsnep_tc_setup,
+};
+
+static int tsnep_mac_init(struct tsnep_adapter *adapter)
+{
+	int retval;
+
+	/* initialize RX filtering, at least configured MAC address and
+	 * broadcast are not filtered
+	 */
+	iowrite16(0, adapter->addr + TSNEP_RX_FILTER);
+
+	/* try to get MAC address in the following order:
+	 * - device tree
+	 * - MAC address register if valid
+	 * - random MAC address
+	 */
+	retval = of_get_mac_address(adapter->pdev->dev.of_node,
+				    adapter->mac_address);
+	if (retval == -EPROBE_DEFER)
+		return -EPROBE_DEFER;
+	if (retval) {
+		*(u32 *)adapter->mac_address =
+			ioread32(adapter->addr + TSNEP_MAC_ADDRESS_LOW);
+		*(u16 *)(adapter->mac_address + sizeof(u32)) =
+			ioread16(adapter->addr + TSNEP_MAC_ADDRESS_HIGH);
+		if (!is_valid_ether_addr(adapter->mac_address))
+			eth_random_addr(adapter->mac_address);
+	}
+
+	tsnep_mac_set_address(adapter, adapter->mac_address);
+	ether_addr_copy(adapter->netdev->dev_addr, adapter->mac_address);
+
+	return 0;
+}
+
+static int tsnep_mdio_init(struct tsnep_adapter *adapter)
+{
+	int retval;
+
+	adapter->mdiobus = mdiobus_alloc();
+	if (!adapter->mdiobus)
+		return -ENOMEM;
+
+	adapter->mdiobus->priv = (void *)adapter;
+	adapter->mdiobus->parent = &adapter->pdev->dev;
+	adapter->mdiobus->read = tsnep_mdiobus_read;
+	adapter->mdiobus->write = tsnep_mdiobus_write;
+	adapter->mdiobus->name = TSNEP "-mdiobus";
+	snprintf(adapter->mdiobus->id, MII_BUS_ID_SIZE, "%s",
+		 adapter->pdev->name);
+
+	/* do not scan broadcast address */
+	adapter->mdiobus->phy_mask = ~0x00000001;
+
+	retval = of_mdiobus_register(adapter->mdiobus,
+				     adapter->pdev->dev.of_node);
+	if (retval != 0)
+		mdiobus_free(adapter->mdiobus);
+
+	return retval;
+}
+
+static int tsnep_phy_init(struct tsnep_adapter *adapter)
+{
+	struct device_node *dn;
+	u16 val;
+	u32 id;
+	int retval;
+
+	retval = of_get_phy_mode(adapter->pdev->dev.of_node,
+				 &adapter->phy_mode);
+	if (retval)
+		adapter->phy_mode = PHY_INTERFACE_MODE_GMII;
+
+	dn = of_parse_phandle(adapter->pdev->dev.of_node, "phy-handle", 0);
+	adapter->phydev = of_phy_find_device(dn);
+	if (!adapter->phydev)
+		adapter->phydev = phy_find_first(adapter->mdiobus);
+	if (!adapter->phydev)
+		return -EIO;
+
+	/* detect optional GMII2RGMII */
+	retval = tsnep_read_md(adapter, ECM_GMII2RGMII_ADDR, MII_PHYSID1, &val);
+	if (retval)
+		return retval;
+	id = val << 16;
+	retval = tsnep_read_md(adapter, ECM_GMII2RGMII_ADDR, MII_PHYSID2, &val);
+	if (retval)
+		return retval;
+	id |= val;
+	if (id == 0)
+		adapter->gmii2rgmii = true;
+
+	/* reset PHY */
+	retval = tsnep_write_md(adapter, adapter->phydev->mdio.addr, MII_BMCR,
+				BMCR_RESET);
+	if (retval)
+		return retval;
+
+	/* reset GMII2RGMII */
+	if (adapter->gmii2rgmii) {
+		retval = tsnep_write_md(adapter, ECM_GMII2RGMII_ADDR,
+					ECM_GMII2RGMII_BMCR, BMCR_RESET);
+		if (retval)
+			return retval;
+		retval = tsnep_write_md(adapter, ECM_GMII2RGMII_ADDR,
+					ECM_GMII2RGMII_BMCR, BMCR_SPEED100);
+		if (retval)
+			return retval;
+	}
+
+	usleep_range(1000, 2000);
+
+	return 0;
+}
+
+static int tsnep_probe(struct platform_device *pdev)
+{
+	struct tsnep_adapter *adapter;
+	struct net_device *netdev;
+	struct resource *io;
+	u32 type;
+	int revision;
+	int version;
+	int queue_count;
+	int retval;
+
+	netdev = devm_alloc_etherdev_mqs(&pdev->dev,
+					 sizeof(struct tsnep_adapter),
+					 TSNEP_MAX_QUEUES, TSNEP_MAX_QUEUES);
+	if (!netdev)
+		return -ENODEV;
+	SET_NETDEV_DEV(netdev, &pdev->dev);
+	adapter = netdev_priv(netdev);
+	platform_set_drvdata(pdev, adapter);
+	adapter->pdev = pdev;
+	adapter->netdev = netdev;
+	adapter->msg_enable = NETIF_MSG_DRV | NETIF_MSG_PROBE |
+			      NETIF_MSG_LINK | NETIF_MSG_IFUP |
+			      NETIF_MSG_IFDOWN | NETIF_MSG_TX_QUEUED;
+
+	netdev->min_mtu = ETH_MIN_MTU;
+	netdev->max_mtu = TSNEP_MAX_FRAME_SIZE;
+
+	spin_lock_init(&adapter->irq_lock);
+	mutex_init(&adapter->md_lock);
+	init_waitqueue_head(&adapter->md_wait);
+	mutex_init(&adapter->gate_control_lock);
+
+	io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	adapter->addr = devm_ioremap_resource(&pdev->dev, io);
+	if (IS_ERR(adapter->addr))
+		return PTR_ERR(adapter->addr);
+	adapter->size = io->end - io->start + 1;
+	adapter->irq = platform_get_irq(pdev, 0);
+	netdev->mem_start = io->start;
+	netdev->mem_end = io->end;
+	netdev->irq = adapter->irq;
+
+	type = ioread32(adapter->addr + ECM_TYPE);
+	revision = (type & ECM_REVISION_MASK) >> ECM_REVISION_SHIFT;
+	version = (type & ECM_VERSION_MASK) >> ECM_VERSION_SHIFT;
+	queue_count = (type & ECM_QUEUE_COUNT_MASK) >> ECM_QUEUE_COUNT_SHIFT;
+	adapter->gate_control = type & ECM_GATE_CONTROL;
+
+	/* first TX/RX queue pair for netdev, rest for stream interface */
+	adapter->num_tx_queues = TSNEP_QUEUES;
+	adapter->num_rx_queues = TSNEP_QUEUES;
+	adapter->stream_count = queue_count - TSNEP_QUEUES;
+
+	iowrite32(0, adapter->addr + ECM_INT_ENABLE);
+	retval = devm_request_irq(&adapter->pdev->dev, adapter->irq, tsnep_irq,
+				  0, TSNEP, adapter);
+	if (retval != 0) {
+		dev_err(&adapter->pdev->dev, "can't get assigned irq %d.",
+			adapter->irq);
+		return retval;
+	}
+	tsnep_enable_irq(adapter, ECM_INT_MD | ECM_INT_LINK);
+
+	retval = tsnep_mac_init(adapter);
+	if (retval)
+		goto mac_init_failed;
+
+	retval = tsnep_mdio_init(adapter);
+	if (retval)
+		goto mdio_init_failed;
+
+	retval = tsnep_phy_init(adapter);
+	if (retval)
+		goto phy_init_failed;
+
+	retval = tsnep_ptp_init(adapter);
+	if (retval)
+		goto ptp_init_failed;
+
+	retval = tsnep_tc_init(adapter);
+	if (retval)
+		goto tc_init_failed;
+
+	netdev->netdev_ops = &tsnep_netdev_ops;
+	netdev->ethtool_ops = &tsnep_ethtool_ops;
+	netdev->features = NETIF_F_SG;
+	netdev->hw_features = netdev->features;
+
+	/* carrier off reporting is important to ethtool even BEFORE open */
+	netif_carrier_off(netdev);
+
+	retval = register_netdev(netdev);
+	if (retval)
+		goto register_failed;
+
+	retval = tsnep_stream_init(adapter);
+	if (retval)
+		goto stream_failed;
+
+	dev_info(&adapter->pdev->dev,
+		 "device version %d.%02d at 0x%llx-0x%llx, IRQ %d\n",
+		 version, revision, io->start, io->end, adapter->irq);
+	dev_info(&adapter->pdev->dev, "%d streams\n", adapter->stream_count);
+	if (adapter->gate_control)
+		dev_info(&adapter->pdev->dev, "gate control detected\n");
+
+	return 0;
+
+	tsnep_stream_cleanup(adapter);
+stream_failed:
+	unregister_netdev(adapter->netdev);
+register_failed:
+	tsnep_tc_cleanup(adapter);
+tc_init_failed:
+	tsnep_ptp_cleanup(adapter);
+ptp_init_failed:
+phy_init_failed:
+	mdiobus_unregister(adapter->mdiobus);
+	mdiobus_free(adapter->mdiobus);
+mdio_init_failed:
+mac_init_failed:
+	return retval;
+}
+
+static int tsnep_remove(struct platform_device *pdev)
+{
+	struct tsnep_adapter *adapter = platform_get_drvdata(pdev);
+
+	tsnep_stream_cleanup(adapter);
+
+	unregister_netdev(adapter->netdev);
+
+	tsnep_tc_cleanup(adapter);
+
+	tsnep_ptp_cleanup(adapter);
+
+	mdiobus_unregister(adapter->mdiobus);
+	mdiobus_free(adapter->mdiobus);
+
+	iowrite32(0, adapter->addr + ECM_INT_ENABLE);
+
+	return 0;
+}
+
+static const struct of_device_id tsnep_of_match[] = {
+	{ .compatible = "engleder,tsnep", },
+{ },
+};
+MODULE_DEVICE_TABLE(of, tsnep_of_match);
+
+static struct platform_driver tsnep_driver = {
+	.driver = {
+		.name = TSNEP,
+		.owner = THIS_MODULE,
+		.of_match_table = of_match_ptr(tsnep_of_match),
+	},
+	.probe = tsnep_probe,
+	.remove = tsnep_remove,
+};
+module_platform_driver(tsnep_driver);
+
+MODULE_AUTHOR("Gerhard Engleder <gerhard@engleder-embedded.com>");
+MODULE_DESCRIPTION("TSN endpoint Ethernet MAC driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/net/ethernet/engleder/tsnep_ptp.c b/drivers/net/ethernet/engleder/tsnep_ptp.c
new file mode 100644
index 000000000000..c39a7e96c8a9
--- /dev/null
+++ b/drivers/net/ethernet/engleder/tsnep_ptp.c
@@ -0,0 +1,224 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2021 Gerhard Engleder <gerhard@engleder-embedded.com> */
+
+#include "tsnep.h"
+
+void tsnep_get_system_time(struct tsnep_adapter *adapter, u64 *time)
+{
+	u32 high_before;
+	u32 low;
+	u32 high;
+
+	/* read high dword twice to detect overrun */
+	high = ioread32(adapter->addr + ECM_SYSTEM_TIME_HIGH);
+	do {
+		low = ioread32(adapter->addr + ECM_SYSTEM_TIME_LOW);
+		high_before = high;
+		high = ioread32(adapter->addr + ECM_SYSTEM_TIME_HIGH);
+	} while (high != high_before);
+	*time = (((u64)high) << 32) | ((u64)low);
+}
+
+int tsnep_ptp_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
+{
+	struct tsnep_adapter *adapter = netdev_priv(netdev);
+	struct hwtstamp_config config;
+
+	if (!ifr)
+		return -EINVAL;
+
+	if (cmd == SIOCSHWTSTAMP) {
+		if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
+			return -EFAULT;
+
+		if (config.flags)
+			return -EINVAL;
+
+		switch (config.tx_type) {
+		case HWTSTAMP_TX_OFF:
+		case HWTSTAMP_TX_ON:
+			break;
+		default:
+			return -ERANGE;
+		}
+
+		switch (config.rx_filter) {
+		case HWTSTAMP_FILTER_NONE:
+			break;
+		case HWTSTAMP_FILTER_ALL:
+		case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
+		case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
+		case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
+		case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
+		case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
+		case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
+		case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
+		case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
+		case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
+		case HWTSTAMP_FILTER_PTP_V2_EVENT:
+		case HWTSTAMP_FILTER_PTP_V2_SYNC:
+		case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
+		case HWTSTAMP_FILTER_NTP_ALL:
+			config.rx_filter = HWTSTAMP_FILTER_ALL;
+			break;
+		default:
+			return -ERANGE;
+		}
+
+		memcpy(&adapter->hwtstamp_config, &config,
+		       sizeof(adapter->hwtstamp_config));
+	}
+
+	if (copy_to_user(ifr->ifr_data, &adapter->hwtstamp_config,
+			 sizeof(adapter->hwtstamp_config)))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int tsnep_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
+{
+	struct tsnep_adapter *adapter = container_of(ptp, struct tsnep_adapter,
+						     ptp_clock_info);
+	bool negative = false;
+	u64 rate_offset;
+
+	if (scaled_ppm < 0) {
+		scaled_ppm = -scaled_ppm;
+		negative = true;
+	}
+
+	/* convert from 16 bit to 32 bit binary fractional, divide by 1000000 to
+	 * eliminate ppm, multiply with 8 to compensate 8ns clock cycle time,
+	 * simplify calculation because 15625 * 8 = 1000000 / 8
+	 */
+	rate_offset = scaled_ppm;
+	rate_offset <<= 16 - 3;
+	rate_offset = div_u64(rate_offset, 15625);
+
+	rate_offset &= ECM_CLOCK_RATE_OFFSET_MASK;
+	if (negative)
+		rate_offset |= ECM_CLOCK_RATE_OFFSET_SIGN;
+	iowrite32(rate_offset & 0xFFFFFFFF, adapter->addr + ECM_CLOCK_RATE);
+
+	return 0;
+}
+
+static int tsnep_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
+{
+	struct tsnep_adapter *adapter = container_of(ptp, struct tsnep_adapter,
+						     ptp_clock_info);
+	u64 system_time;
+	unsigned long flags;
+
+	spin_lock_irqsave(&adapter->ptp_lock, flags);
+
+	tsnep_get_system_time(adapter, &system_time);
+
+	system_time += delta;
+
+	/* high dword is buffered in hardware and synchronously written to
+	 * system time when low dword is written
+	 */
+	iowrite32(system_time >> 32, adapter->addr + ECM_SYSTEM_TIME_HIGH);
+	iowrite32(system_time & 0xFFFFFFFF,
+		  adapter->addr + ECM_SYSTEM_TIME_LOW);
+
+	spin_unlock_irqrestore(&adapter->ptp_lock, flags);
+
+	return 0;
+}
+
+static int tsnep_ptp_gettimex64(struct ptp_clock_info *ptp,
+				struct timespec64 *ts,
+				struct ptp_system_timestamp *sts)
+{
+	struct tsnep_adapter *adapter = container_of(ptp, struct tsnep_adapter,
+						     ptp_clock_info);
+	u32 high_before;
+	u32 low;
+	u32 high;
+	u64 system_time;
+
+	/* read high dword twice to detect overrun */
+	high = ioread32(adapter->addr + ECM_SYSTEM_TIME_HIGH);
+	do {
+		ptp_read_system_prets(sts);
+		low = ioread32(adapter->addr + ECM_SYSTEM_TIME_LOW);
+		ptp_read_system_postts(sts);
+		high_before = high;
+		high = ioread32(adapter->addr + ECM_SYSTEM_TIME_HIGH);
+	} while (high != high_before);
+	system_time = (((u64)high) << 32) | ((u64)low);
+
+	*ts = ns_to_timespec64(system_time);
+
+	return 0;
+}
+
+static int tsnep_ptp_settime64(struct ptp_clock_info *ptp,
+			       const struct timespec64 *ts)
+{
+	struct tsnep_adapter *adapter = container_of(ptp, struct tsnep_adapter,
+						     ptp_clock_info);
+	u64 system_time = timespec64_to_ns(ts);
+	unsigned long flags;
+
+	spin_lock_irqsave(&adapter->ptp_lock, flags);
+
+	/* high dword is buffered in hardware and synchronously written to
+	 * system time when low dword is written
+	 */
+	iowrite32(system_time >> 32, adapter->addr + ECM_SYSTEM_TIME_HIGH);
+	iowrite32(system_time & 0xFFFFFFFF,
+		  adapter->addr + ECM_SYSTEM_TIME_LOW);
+
+	spin_unlock_irqrestore(&adapter->ptp_lock, flags);
+
+	return 0;
+}
+
+int tsnep_ptp_init(struct tsnep_adapter *adapter)
+{
+	int retval = 0;
+
+	adapter->hwtstamp_config.rx_filter = HWTSTAMP_FILTER_NONE;
+	adapter->hwtstamp_config.tx_type = HWTSTAMP_TX_OFF;
+
+	snprintf(adapter->ptp_clock_info.name, 16, "%s", TSNEP);
+	adapter->ptp_clock_info.owner = THIS_MODULE;
+	/* at most 2^-1ns adjustment every clock cycle for 8ns clock cycle time,
+	 * stay slightly below because only bits below 2^-1ns are supported
+	 */
+	adapter->ptp_clock_info.max_adj = (500000000 / 8 - 1);
+	adapter->ptp_clock_info.adjfine = tsnep_ptp_adjfine;
+	adapter->ptp_clock_info.adjtime = tsnep_ptp_adjtime;
+	adapter->ptp_clock_info.gettimex64 = tsnep_ptp_gettimex64;
+	adapter->ptp_clock_info.settime64 = tsnep_ptp_settime64;
+
+	spin_lock_init(&adapter->ptp_lock);
+
+	/* deactivate legacy synchronisation */
+	iowrite32(0, adapter->addr + ECM_CLOCK_CONFIG);
+
+	adapter->ptp_clock = ptp_clock_register(&adapter->ptp_clock_info,
+						&adapter->pdev->dev);
+	if (IS_ERR(adapter->ptp_clock)) {
+		netdev_err(adapter->netdev, "ptp_clock_register failed\n");
+
+		retval = PTR_ERR(adapter->ptp_clock);
+		adapter->ptp_clock = NULL;
+	} else if (adapter->ptp_clock) {
+		netdev_info(adapter->netdev, "PHC added\n");
+	}
+
+	return retval;
+}
+
+void tsnep_ptp_cleanup(struct tsnep_adapter *adapter)
+{
+	if (adapter->ptp_clock) {
+		ptp_clock_unregister(adapter->ptp_clock);
+		netdev_info(adapter->netdev, "PHC removed\n");
+	}
+}
diff --git a/drivers/net/ethernet/engleder/tsnep_stream.c b/drivers/net/ethernet/engleder/tsnep_stream.c
new file mode 100644
index 000000000000..ed89f3318a10
--- /dev/null
+++ b/drivers/net/ethernet/engleder/tsnep_stream.c
@@ -0,0 +1,489 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2021 Gerhard Engleder <gerhard@engleder-embedded.com> */
+
+#include "tsnep.h"
+
+#include <linux/idr.h>
+#include <linux/rbtree.h>
+#include <linux/poll.h>
+
+#define MAX_DMA_BUFFER_COUNT (16 * 1024)
+#define PGOFF_IO 0
+#define PGOFF_DMA 4
+
+struct tsnep_dma_buffer {
+	pgoff_t pgoff;
+	struct rb_node rb_node;
+	void *data;
+	dma_addr_t addr;
+};
+
+#define TSNEP_CMD_STREAM 0
+struct tsnep_cmd_stream {
+	s32 cmd;
+};
+
+#define TSNEP_CMD_DMA 1024
+struct tsnep_cmd_dma {
+	s32 cmd;
+	union {
+		u64 offset;
+		u64 addr;
+	};
+};
+
+#define MAX_CMD_LENGTH (sizeof(struct tsnep_cmd_dma))
+
+struct tsnep_file {
+	struct tsnep_adapter *adapter;
+	struct tsnep_stream *stream;
+
+	bool cmd;
+	size_t cmd_length;
+	u8 cmd_data[MAX_CMD_LENGTH];
+};
+
+static DEFINE_IDA(index_ida);
+
+static struct tsnep_dma_buffer *
+tsnep_create_dma_buffer(struct tsnep_stream *stream)
+{
+	struct tsnep_dma_buffer *buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
+
+	if (!buffer)
+		return 0;
+
+	buffer->data = dma_alloc_coherent(&stream->adapter->pdev->dev,
+					  PAGE_SIZE, &buffer->addr, GFP_KERNEL);
+	if (!buffer->data) {
+		kfree(buffer);
+
+		return 0;
+	}
+
+	return buffer;
+}
+
+static void tsnep_delete_dma_buffer(struct tsnep_stream *stream,
+				    struct tsnep_dma_buffer *buffer)
+{
+	dma_free_coherent(&stream->adapter->pdev->dev, PAGE_SIZE, buffer->data,
+			  buffer->addr);
+	kfree(buffer);
+}
+
+static struct tsnep_dma_buffer *
+tsnep_get_dma_buffer(struct tsnep_stream *stream, pgoff_t pgoff)
+{
+	struct rb_node **link;
+	struct rb_node *parent = 0;
+	struct tsnep_dma_buffer *buffer;
+
+	mutex_lock(&stream->dma_buffer_lock);
+
+	/* search for existing DMA buffer */
+	link = &stream->dma_buffer.rb_node;
+	while (*link != 0) {
+		parent = *link;
+		buffer = rb_entry(parent, struct tsnep_dma_buffer, rb_node);
+
+		if (buffer->pgoff > pgoff)
+			link = &(*link)->rb_left;
+		else if (buffer->pgoff < pgoff)
+			link = &(*link)->rb_right;
+		else
+			break;
+	}
+
+	/* create new DMA buffer */
+	if (*link == 0) {
+		buffer = tsnep_create_dma_buffer(stream);
+		if (buffer != 0) {
+			buffer->pgoff = pgoff;
+			rb_link_node(&buffer->rb_node, parent, link);
+			rb_insert_color(&buffer->rb_node, &stream->dma_buffer);
+		}
+	}
+
+	mutex_unlock(&stream->dma_buffer_lock);
+
+	return buffer;
+}
+
+static int tsnep_get_dma_buffer_addr(struct tsnep_stream *stream, pgoff_t pgoff,
+				     dma_addr_t *addr)
+{
+	struct rb_node *node;
+	struct tsnep_dma_buffer *buffer = 0;
+	int retval = -EINVAL;
+
+	mutex_lock(&stream->dma_buffer_lock);
+
+	/* search for existing DMA buffer */
+	node = stream->dma_buffer.rb_node;
+	while (node != 0) {
+		buffer = rb_entry(node, struct tsnep_dma_buffer, rb_node);
+
+		if (buffer->pgoff > pgoff) {
+			node = node->rb_left;
+		} else if (buffer->pgoff < pgoff) {
+			node = node->rb_right;
+		} else {
+			*addr = buffer->addr;
+			retval = 0;
+			break;
+		}
+	}
+
+	mutex_unlock(&stream->dma_buffer_lock);
+
+	return retval;
+}
+
+static void tsnep_delete_all_dma_buffers(struct tsnep_stream *stream)
+{
+	struct rb_node *node;
+	struct tsnep_dma_buffer *buffer;
+
+	mutex_lock(&stream->dma_buffer_lock);
+
+	/* delete one DMA buffer after the other */
+	node = rb_first(&stream->dma_buffer);
+	while (node != 0) {
+		rb_erase(node, &stream->dma_buffer);
+		buffer = rb_entry(node, struct tsnep_dma_buffer, rb_node);
+		tsnep_delete_dma_buffer(stream, buffer);
+
+		node = rb_first(&stream->dma_buffer);
+	}
+
+	mutex_unlock(&stream->dma_buffer_lock);
+}
+
+static int tsnep_stream_open(struct inode *inode, struct file *filp)
+{
+	struct tsnep_adapter *adapter =
+		container_of(filp->private_data, struct tsnep_adapter, misc);
+	struct tsnep_file *tsnep_file;
+
+	tsnep_file = kzalloc(sizeof(*tsnep_file), GFP_KERNEL);
+	if (!tsnep_file)
+		return -ENOMEM;
+	tsnep_file->adapter = adapter;
+	filp->private_data = tsnep_file;
+
+	return 0;
+}
+
+static int tsnep_stream_release(struct inode *inode, struct file *filp)
+{
+	struct tsnep_file *tsnep_file = filp->private_data;
+
+	mutex_lock(&tsnep_file->adapter->stream_lock);
+
+	if (tsnep_file->stream) {
+		tsnep_delete_all_dma_buffers(tsnep_file->stream);
+		tsnep_file->stream->in_use = false;
+	}
+
+	mutex_unlock(&tsnep_file->adapter->stream_lock);
+
+	kfree(tsnep_file);
+
+	return 0;
+}
+
+static ssize_t tsnep_stream_read(struct file *filp, char __user *buf,
+				 size_t count, loff_t *f_pos)
+{
+	struct tsnep_file *tsnep_file = filp->private_data;
+	struct mutex *lock = &tsnep_file->adapter->stream_lock;
+	ssize_t retval;
+
+	if (mutex_lock_interruptible(lock))
+		return -ERESTARTSYS;
+
+	if (tsnep_file->cmd) {
+		if (count < tsnep_file->cmd_length) {
+			mutex_unlock(lock);
+
+			return -EINVAL;
+		}
+
+		if (copy_to_user(buf, tsnep_file->cmd_data,
+				 tsnep_file->cmd_length)) {
+			mutex_unlock(lock);
+
+			return -EFAULT;
+		}
+		tsnep_file->cmd = false;
+
+		retval = tsnep_file->cmd_length;
+	} else {
+		retval = -EBUSY;
+	}
+
+	mutex_unlock(lock);
+
+	return retval;
+}
+
+static ssize_t tsnep_stream_assign(struct tsnep_file *tsnep_file, s32 cmd,
+				   const char __user *buf, size_t count)
+{
+	struct mutex *lock = &tsnep_file->adapter->stream_lock;
+	ssize_t retval;
+
+	if (count != sizeof(struct tsnep_cmd_stream))
+		return -EINVAL;
+	if (tsnep_file->stream)
+		return -EBUSY;
+	if (cmd >= tsnep_file->adapter->stream_count)
+		return -ENODEV;
+
+	if (mutex_lock_interruptible(lock))
+		return -ERESTARTSYS;
+
+	if (!tsnep_file->adapter->stream[cmd].in_use) {
+		tsnep_file->adapter->stream[cmd].in_use = true;
+		tsnep_file->stream = &tsnep_file->adapter->stream[cmd];
+		retval = count;
+	} else {
+		retval = -EBUSY;
+	}
+
+	mutex_unlock(lock);
+
+	return retval;
+}
+
+static ssize_t tsnep_stream_dma(struct tsnep_file *tsnep_file, s32 cmd,
+				const char __user *buf, size_t count)
+{
+	struct mutex *lock = &tsnep_file->adapter->stream_lock;
+	struct tsnep_cmd_dma dma;
+	pgoff_t pgoff;
+	dma_addr_t addr;
+	ssize_t retval;
+
+	if (count != sizeof(dma))
+		return -EINVAL;
+	if (!tsnep_file->stream)
+		return -EBUSY;
+	if (copy_from_user(&dma, buf, sizeof(dma)))
+		return -EFAULT;
+
+	pgoff = dma.offset / PAGE_SIZE;
+	if (pgoff < PGOFF_DMA ||
+	    pgoff >= (PGOFF_DMA + MAX_DMA_BUFFER_COUNT))
+		return -EINVAL;
+
+	if (mutex_lock_interruptible(lock))
+		return -ERESTARTSYS;
+
+	if (tsnep_file->cmd) {
+		mutex_unlock(lock);
+
+		return -EBUSY;
+	}
+
+	retval = tsnep_get_dma_buffer_addr(tsnep_file->stream, pgoff, &addr);
+	if (retval) {
+		mutex_unlock(lock);
+
+		return retval;
+	}
+
+	dma.addr = addr + dma.offset % PAGE_SIZE;
+	memcpy(tsnep_file->cmd_data, &dma, sizeof(dma));
+	tsnep_file->cmd_length = sizeof(dma);
+	tsnep_file->cmd = true;
+
+	retval = count;
+
+	mutex_unlock(lock);
+
+	return retval;
+}
+
+static ssize_t tsnep_stream_write(struct file *filp, const char __user *buf,
+				  size_t count, loff_t *f_pos)
+{
+	struct tsnep_file *tsnep_file = filp->private_data;
+	s32 cmd;
+
+	if (count < sizeof(cmd))
+		return -EINVAL;
+
+	if (copy_from_user(&cmd, buf, sizeof(cmd)))
+		return -EFAULT;
+
+	if (cmd >= TSNEP_CMD_STREAM && cmd < TSNEP_CMD_DMA)
+		return tsnep_stream_assign(tsnep_file, cmd, buf, count);
+	else if (cmd == TSNEP_CMD_DMA)
+		return tsnep_stream_dma(tsnep_file, cmd, buf, count);
+
+	return -EINVAL;
+}
+
+static int tsnep_stream_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+	struct tsnep_file *tsnep_file = filp->private_data;
+	struct tsnep_dma_buffer *buffer;
+	int retval;
+
+	if (!tsnep_file->stream)
+		return -ENODEV;
+
+	if ((vma->vm_end - vma->vm_start) > PAGE_SIZE)
+		return -EINVAL;
+
+	if (vma->vm_pgoff == PGOFF_IO) {
+		/* IO */
+		vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+
+		retval = remap_pfn_range(vma, vma->vm_start,
+					 tsnep_file->stream->addr >> PAGE_SHIFT,
+					 vma->vm_end - vma->vm_start,
+					 vma->vm_page_prot);
+	} else if (vma->vm_pgoff >= PGOFF_DMA &&
+		   vma->vm_pgoff < (PGOFF_DMA + MAX_DMA_BUFFER_COUNT)) {
+		/* DMA */
+		buffer = tsnep_get_dma_buffer(tsnep_file->stream,
+					      vma->vm_pgoff);
+		if (!buffer)
+			return -ENOMEM;
+
+		retval = remap_pfn_range(vma, vma->vm_start,
+					 buffer->addr >> PAGE_SHIFT,
+					 vma->vm_end - vma->vm_start,
+					 vma->vm_page_prot);
+	} else {
+		retval = -EINVAL;
+	}
+
+	return retval;
+}
+
+static const struct file_operations tsnep_stream_fops = {
+	.owner = THIS_MODULE,
+	.open = tsnep_stream_open,
+	.release = tsnep_stream_release,
+	.read = tsnep_stream_read,
+	.write = tsnep_stream_write,
+	.mmap = tsnep_stream_mmap,
+	.llseek = no_llseek,
+};
+
+static ssize_t loopback_show(struct device *dev, struct device_attribute *attr,
+			     char *buf)
+{
+	struct tsnep_adapter *adapter =
+		container_of(dev_get_drvdata(dev), struct tsnep_adapter, misc);
+
+	if (!adapter->loopback)
+		return sprintf(buf, "off\n");
+	else if (adapter->loopback_speed == 1000)
+		return sprintf(buf, "1000\n");
+
+	return sprintf(buf, "100\n");
+}
+
+static ssize_t loopback_store(struct device *dev, struct device_attribute *attr,
+			      const char *buf, size_t len)
+{
+	struct tsnep_adapter *adapter =
+		container_of(dev_get_drvdata(dev), struct tsnep_adapter, misc);
+	int retval;
+
+	if (len < 3)
+		return -EINVAL;
+
+	if ((len == 3 && strncmp(buf, "100", 3) == 0) ||
+	    (len == 4 && strncmp(buf, "100\n", 4) == 0)) {
+		retval = tsnep_enable_loopback(adapter, 100);
+		if (!retval)
+			retval = len;
+	} else if ((len == 4 && strncmp(buf, "1000", 4) == 0) ||
+		   (len == 5 && strncmp(buf, "1000\n", 5) == 0)) {
+		retval = tsnep_enable_loopback(adapter, 1000);
+		if (!retval)
+			retval = len;
+	} else if ((len == 3 && strncmp(buf, "off", 3) == 0) ||
+		   (len == 4 && strncmp(buf, "off\n", 4) == 0)) {
+		retval = tsnep_disable_loopback(adapter);
+		if (!retval)
+			retval = len;
+	} else {
+		retval = -EINVAL;
+	}
+
+	return retval;
+}
+
+static DEVICE_ATTR_RW(loopback);
+
+static struct attribute *tsnep_stream_attrs[] = {
+	&dev_attr_loopback.attr,
+	NULL,
+};
+
+static const struct attribute_group tsnep_stream_group = {
+	.attrs = tsnep_stream_attrs,
+};
+
+static const struct attribute_group *tsnep_stream_groups[] = {
+	&tsnep_stream_group,
+	NULL,
+};
+
+int tsnep_stream_init(struct tsnep_adapter *adapter)
+{
+	struct resource *io;
+	int num_queues;
+	int i;
+	int retval;
+
+	io = platform_get_resource(adapter->pdev, IORESOURCE_MEM, 0);
+	if (!io)
+		return -ENODEV;
+
+	num_queues = max(adapter->num_tx_queues, adapter->num_rx_queues);
+	mutex_init(&adapter->stream_lock);
+	for (i = 0; i < adapter->stream_count; i++) {
+		adapter->stream[i].adapter = adapter;
+		adapter->stream[i].addr = io->start +
+					  TSNEP_QUEUE(num_queues + i);
+		mutex_init(&adapter->stream[i].dma_buffer_lock);
+		adapter->stream[i].dma_buffer = RB_ROOT;
+	}
+
+	retval = ida_simple_get(&index_ida, 0, 0, GFP_KERNEL);
+	if (retval < 0)
+		goto index_failed;
+	adapter->index = retval;
+	snprintf(adapter->name, sizeof(adapter->name), "%s%d", TSNEP,
+		 adapter->index);
+
+	adapter->misc.name = adapter->name;
+	adapter->misc.minor = MISC_DYNAMIC_MINOR;
+	adapter->misc.fops = &tsnep_stream_fops;
+	adapter->misc.parent = &adapter->pdev->dev;
+	adapter->misc.groups = tsnep_stream_groups;
+	retval = misc_register(&adapter->misc);
+	if (retval != 0)
+		goto misc_failed;
+
+	return 0;
+
+misc_failed:
+	ida_simple_remove(&index_ida, adapter->index);
+index_failed:
+	return retval;
+}
+
+void tsnep_stream_cleanup(struct tsnep_adapter *adapter)
+{
+	misc_deregister(&adapter->misc);
+	ida_simple_remove(&index_ida, adapter->index);
+}
diff --git a/drivers/net/ethernet/engleder/tsnep_tc.c b/drivers/net/ethernet/engleder/tsnep_tc.c
new file mode 100644
index 000000000000..047c45fb42b6
--- /dev/null
+++ b/drivers/net/ethernet/engleder/tsnep_tc.c
@@ -0,0 +1,443 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2021 Gerhard Engleder <gerhard@engleder-embedded.com> */
+
+#include "tsnep.h"
+
+#include <net/pkt_sched.h>
+
+/* save one operation at the end for additional operation at list change */
+#define TSNEP_MAX_GCL_NUM (TSNEP_GCL_COUNT - 1)
+
+static int tsnep_validate_gcl(struct tc_taprio_qopt_offload *qopt)
+{
+	int i;
+	u64 cycle_time;
+
+	if (!qopt->cycle_time)
+		return -ERANGE;
+	if (qopt->num_entries > TSNEP_MAX_GCL_NUM)
+		return -EINVAL;
+	cycle_time = 0;
+	for (i = 0; i < qopt->num_entries; i++) {
+		if (qopt->entries[i].command != TC_TAPRIO_CMD_SET_GATES)
+			return -EINVAL;
+		if (qopt->entries[i].gate_mask & ~TSNEP_GCL_MASK)
+			return -EINVAL;
+		if (qopt->entries[i].interval < TSNEP_GCL_MIN_INTERVAL)
+			return -EINVAL;
+		cycle_time += qopt->entries[i].interval;
+	}
+	if (qopt->cycle_time != cycle_time)
+		return -EINVAL;
+	if (qopt->cycle_time_extension >= qopt->cycle_time)
+		return -EINVAL;
+
+	return 0;
+}
+
+static void tsnep_write_gcl_operation(struct tsnep_gcl *gcl, int index,
+				      u32 properties, u32 interval, bool flush)
+{
+	void *addr = gcl->addr + sizeof(struct tsnep_gcl_operation) * index;
+	u32 tmp;
+
+	gcl->operation[index].properties = properties;
+	gcl->operation[index].interval = interval;
+
+	iowrite32(properties, addr);
+	iowrite32(interval, addr + sizeof(u32));
+
+	if (flush) {
+		/* flush write with read access */
+		tmp = ioread32(addr);
+	}
+}
+
+static u64 tsnep_change_duration(struct tsnep_gcl *gcl, int index)
+{
+	u64 duration;
+	int count;
+
+	/* change needs to be triggered one or two operations before start of
+	 * new gate control list
+	 * - change is triggered at start of operation (minimum one operation)
+	 * - operation with adjusted interval is inserted on demand to exactly
+	 *   meet the start of the new gate control list (optional)
+	 *
+	 * additionally properties are read directly after start of previous
+	 * operation
+	 *
+	 * therefore, three operations needs to be considered for the limit
+	 */
+	duration = 0;
+	count = 3;
+	while (count) {
+		duration += gcl->operation[index].interval;
+
+		index--;
+		if (index < 0)
+			index = gcl->count - 1;
+
+		count--;
+	}
+
+	return duration;
+}
+
+static void tsnep_write_gcl(struct tsnep_gcl *gcl,
+			    struct tc_taprio_qopt_offload *qopt)
+{
+	int i;
+	u32 properties;
+	u64 extend;
+	u64 cut;
+
+	gcl->base_time = ktime_to_ns(qopt->base_time);
+	gcl->cycle_time = qopt->cycle_time;
+	gcl->cycle_time_extension = qopt->cycle_time_extension;
+
+	for (i = 0; i < qopt->num_entries; i++) {
+		properties = qopt->entries[i].gate_mask;
+		if (i == (qopt->num_entries - 1))
+			properties |= TSNEP_GCL_LAST;
+
+		tsnep_write_gcl_operation(gcl, i, properties,
+					  qopt->entries[i].interval, true);
+	}
+	gcl->count = qopt->num_entries;
+
+	/* calculate change limit; i.e., the time needed between enable and
+	 * start of new gate control list
+	 */
+
+	/* case 1: extend cycle time for change
+	 * - change duration of last operation
+	 * - cycle time extension
+	 */
+	extend = tsnep_change_duration(gcl, gcl->count - 1);
+	extend += gcl->cycle_time_extension;
+
+	/* case 2: cut cycle time for change
+	 * - maximum change duration
+	 */
+	cut = 0;
+	for (i = 0; i < gcl->count; i++)
+		cut = max(cut, tsnep_change_duration(gcl, i));
+
+	/* use maximum, because the actual case (extend or cut) can be
+	 * determined only after limit is known (chicken-and-egg problem)
+	 */
+	gcl->change_limit = max(extend, cut);
+}
+
+static u64 tsnep_gcl_start_after(struct tsnep_gcl *gcl, u64 limit)
+{
+	u64 start = gcl->base_time;
+	u64 n;
+
+	if (start <= limit) {
+		n = div64_u64(limit - start, gcl->cycle_time);
+		start += (n + 1) * gcl->cycle_time;
+	}
+
+	return start;
+}
+
+static u64 tsnep_gcl_start_before(struct tsnep_gcl *gcl, u64 limit)
+{
+	u64 start = gcl->base_time;
+	u64 n;
+
+	n = div64_u64(limit - start, gcl->cycle_time);
+	start += n * gcl->cycle_time;
+	if (start == limit)
+		start -= gcl->cycle_time;
+
+	return start;
+}
+
+static u64 tsnep_set_gcl_change(struct tsnep_gcl *gcl, int index, u64 change,
+				bool insert)
+{
+	/* previous operation triggers change and properties are evaluated at
+	 * start of operation
+	 */
+	if (index == 0)
+		index = gcl->count - 1;
+	else
+		index = index - 1;
+	change -= gcl->operation[index].interval;
+
+	/* optionally change to new list with additional operation in between */
+	if (insert) {
+		void *addr = gcl->addr +
+			     sizeof(struct tsnep_gcl_operation) * index;
+
+		gcl->operation[index].properties |= TSNEP_GCL_INSERT;
+		iowrite32(gcl->operation[index].properties, addr);
+	}
+
+	return change;
+}
+
+static void tsnep_clean_gcl(struct tsnep_gcl *gcl)
+{
+	int i;
+	u32 mask = TSNEP_GCL_LAST | TSNEP_GCL_MASK;
+	void *addr;
+
+	/* search for insert operation and reset properties */
+	for (i = 0; i < gcl->count; i++) {
+		if (gcl->operation[i].properties & ~mask) {
+			addr = gcl->addr +
+			       sizeof(struct tsnep_gcl_operation) * i;
+
+			gcl->operation[i].properties &= mask;
+			iowrite32(gcl->operation[i].properties, addr);
+
+			break;
+		}
+	}
+}
+
+static u64 tsnep_insert_gcl_operation(struct tsnep_gcl *gcl, int ref,
+				      u64 change, u32 interval)
+{
+	u32 properties;
+
+	properties = gcl->operation[ref].properties & TSNEP_GCL_MASK;
+	/* change to new list directly after inserted operation */
+	properties |= TSNEP_GCL_CHANGE;
+
+	/* last operation of list is reserved to insert operation */
+	tsnep_write_gcl_operation(gcl, TSNEP_GCL_COUNT - 1, properties,
+				  interval, false);
+
+	return tsnep_set_gcl_change(gcl, ref, change, true);
+}
+
+static u64 tsnep_extend_gcl(struct tsnep_gcl *gcl, u64 start, u32 extension)
+{
+	int ref = gcl->count - 1;
+	u32 interval = gcl->operation[ref].interval + extension;
+
+	start -= gcl->operation[ref].interval;
+
+	return tsnep_insert_gcl_operation(gcl, ref, start, interval);
+}
+
+static u64 tsnep_cut_gcl(struct tsnep_gcl *gcl, u64 start, u64 cycle_time)
+{
+	u64 sum = 0;
+	int i;
+
+	/* find operation which shall be cutted */
+	for (i = 0; i < gcl->count; i++) {
+		u64 sum_tmp = sum + gcl->operation[i].interval;
+		u64 interval;
+
+		/* sum up operations as long as cycle time is not exceeded */
+		if (sum_tmp > cycle_time)
+			break;
+
+		/* remaining interval must be big enough for hardware */
+		interval = cycle_time - sum_tmp;
+		if (interval > 0 && interval < TSNEP_GCL_MIN_INTERVAL)
+			break;
+
+		sum = sum_tmp;
+	}
+	if (sum == cycle_time) {
+		/* no need to cut operation itself or whole cycle
+		 * => change exactly at operation
+		 */
+		return tsnep_set_gcl_change(gcl, i, start + sum, false);
+	}
+	return tsnep_insert_gcl_operation(gcl, i, start + sum,
+					  cycle_time - sum);
+}
+
+static int tsnep_enable_gcl(struct tsnep_adapter *adapter,
+			    struct tsnep_gcl *gcl, struct tsnep_gcl *curr)
+{
+	u64 system_time;
+	u64 timeout;
+	u64 limit;
+
+	/* estimate timeout limit after timeout enable, actually timeout limit
+	 * in hardware will be earlier than estimate so we are on the safe side
+	 */
+	tsnep_get_system_time(adapter, &system_time);
+	timeout = system_time + TSNEP_GC_TIMEOUT;
+
+	if (curr)
+		limit = timeout + curr->change_limit;
+	else
+		limit = timeout;
+
+	gcl->start_time = tsnep_gcl_start_after(gcl, limit);
+
+	/* gate control time register is only 32bit => time shall be in the near
+	 * future (no driver support for far future implemented)
+	 */
+	if ((gcl->start_time - system_time) >= U32_MAX)
+		return -EAGAIN;
+
+	if (curr) {
+		/* change gate control list */
+		u64 last;
+		u64 change;
+
+		last = tsnep_gcl_start_before(curr, gcl->start_time);
+		if ((last + curr->cycle_time) == gcl->start_time)
+			change = tsnep_cut_gcl(curr, last,
+					       gcl->start_time - last);
+		else if (((gcl->start_time - last) <=
+			  curr->cycle_time_extension) ||
+			 ((gcl->start_time - last) <= TSNEP_GCL_MIN_INTERVAL))
+			change = tsnep_extend_gcl(curr, last,
+						  gcl->start_time - last);
+		else
+			change = tsnep_cut_gcl(curr, last,
+					       gcl->start_time - last);
+
+		WARN_ON(change <= timeout);
+		gcl->change = true;
+		iowrite32(change & 0xFFFFFFFF, adapter->addr + TSNEP_GC_CHANGE);
+	} else {
+		/* start gate control list */
+		WARN_ON(gcl->start_time <= timeout);
+		gcl->change = false;
+		iowrite32(gcl->start_time & 0xFFFFFFFF,
+			  adapter->addr + TSNEP_GC_TIME);
+	}
+
+	return 0;
+}
+
+static int tsnep_taprio(struct tsnep_adapter *adapter,
+			struct tc_taprio_qopt_offload *qopt)
+{
+	struct tsnep_gcl *gcl;
+	struct tsnep_gcl *curr;
+	int retval;
+
+	if (!adapter->gate_control)
+		return -EOPNOTSUPP;
+
+	if (!qopt->enable) {
+		/* disable gate control if active */
+		mutex_lock(&adapter->gate_control_lock);
+
+		if (adapter->gate_control_active) {
+			iowrite8(TSNEP_GC_DISABLE, adapter->addr + TSNEP_GC);
+			adapter->gate_control_active = false;
+		}
+
+		mutex_unlock(&adapter->gate_control_lock);
+
+		return 0;
+	}
+
+	retval = tsnep_validate_gcl(qopt);
+	if (retval)
+		return retval;
+
+	mutex_lock(&adapter->gate_control_lock);
+
+	gcl = &adapter->gcl[adapter->next_gcl];
+	tsnep_write_gcl(gcl, qopt);
+
+	/* select current gate control list if active */
+	if (adapter->gate_control_active) {
+		if (adapter->next_gcl == 0)
+			curr = &adapter->gcl[1];
+		else
+			curr = &adapter->gcl[0];
+	} else {
+		curr = NULL;
+	}
+
+	for (;;) {
+		/* start timeout which discards late enable, this helps ensuring
+		 * that start/change time are in the future at enable
+		 */
+		iowrite8(TSNEP_GC_ENABLE_TIMEOUT, adapter->addr + TSNEP_GC);
+
+		retval = tsnep_enable_gcl(adapter, gcl, curr);
+		if (retval) {
+			mutex_unlock(&adapter->gate_control_lock);
+
+			return retval;
+		}
+
+		/* enable gate control list */
+		if (adapter->next_gcl == 0)
+			iowrite8(TSNEP_GC_ENABLE_A, adapter->addr + TSNEP_GC);
+		else
+			iowrite8(TSNEP_GC_ENABLE_B, adapter->addr + TSNEP_GC);
+
+		/* done if timeout did not happen */
+		if (!(ioread32(adapter->addr + TSNEP_GC) &
+		      TSNEP_GC_TIMEOUT_SIGNAL))
+			break;
+
+		/* timeout is acknowledged with any enable */
+		iowrite8(TSNEP_GC_ENABLE_A, adapter->addr + TSNEP_GC);
+
+		if (curr)
+			tsnep_clean_gcl(curr);
+
+		/* retry because of timeout */
+	}
+
+	adapter->gate_control_active = true;
+
+	if (adapter->next_gcl == 0)
+		adapter->next_gcl = 1;
+	else
+		adapter->next_gcl = 0;
+
+	mutex_unlock(&adapter->gate_control_lock);
+
+	return 0;
+}
+
+int tsnep_tc_setup(struct net_device *netdev, enum tc_setup_type type,
+		   void *type_data)
+{
+	struct tsnep_adapter *adapter = netdev_priv(netdev);
+
+	switch (type) {
+	case TC_SETUP_QDISC_TAPRIO:
+		return tsnep_taprio(adapter, type_data);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+int tsnep_tc_init(struct tsnep_adapter *adapter)
+{
+	if (!adapter->gate_control)
+		return 0;
+
+	/* open all gates */
+	iowrite8(TSNEP_GC_DISABLE, adapter->addr + TSNEP_GC);
+	iowrite32(TSNEP_GC_OPEN | TSNEP_GC_NEXT_OPEN, adapter->addr + TSNEP_GC);
+
+	adapter->gcl[0].addr = adapter->addr + TSNEP_GCL_A;
+	adapter->gcl[1].addr = adapter->addr + TSNEP_GCL_B;
+
+	return 0;
+}
+
+void tsnep_tc_cleanup(struct tsnep_adapter *adapter)
+{
+	if (!adapter->gate_control)
+		return;
+
+	if (adapter->gate_control_active) {
+		iowrite8(TSNEP_GC_DISABLE, adapter->addr + TSNEP_GC);
+		adapter->gate_control_active = false;
+	}
+}
diff --git a/drivers/net/ethernet/engleder/tsnep_test.c b/drivers/net/ethernet/engleder/tsnep_test.c
new file mode 100644
index 000000000000..fcbc71317f67
--- /dev/null
+++ b/drivers/net/ethernet/engleder/tsnep_test.c
@@ -0,0 +1,811 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2021 Gerhard Engleder <gerhard@engleder-embedded.com> */
+
+#include "tsnep.h"
+
+#include <net/pkt_sched.h>
+
+enum tsnep_test {
+	TSNEP_TEST_ENABLE = 0,
+	TSNEP_TEST_TAPRIO,
+	TSNEP_TEST_TAPRIO_CHANGE,
+	TSNEP_TEST_TAPRIO_EXTENSION,
+};
+
+static const char tsnep_test_strings[][ETH_GSTRING_LEN] = {
+	"Enable timeout        (offline)",
+	"TAPRIO                (offline)",
+	"TAPRIO change         (offline)",
+	"TAPRIO extension      (offline)",
+};
+
+#define TSNEP_TEST_COUNT (sizeof(tsnep_test_strings) / ETH_GSTRING_LEN)
+
+static bool enable_gc_timeout(struct tsnep_adapter *adapter)
+{
+	iowrite8(TSNEP_GC_ENABLE_TIMEOUT, adapter->addr + TSNEP_GC);
+	if (!(ioread32(adapter->addr + TSNEP_GC) & TSNEP_GC_TIMEOUT_ACTIVE))
+		return false;
+
+	return true;
+}
+
+static bool gc_timeout_signaled(struct tsnep_adapter *adapter)
+{
+	if (ioread32(adapter->addr + TSNEP_GC) & TSNEP_GC_TIMEOUT_SIGNAL)
+		return true;
+
+	return false;
+}
+
+static bool ack_gc_timeout(struct tsnep_adapter *adapter)
+{
+	iowrite8(TSNEP_GC_ENABLE_TIMEOUT, adapter->addr + TSNEP_GC);
+	if (ioread32(adapter->addr + TSNEP_GC) &
+	    (TSNEP_GC_TIMEOUT_ACTIVE | TSNEP_GC_TIMEOUT_SIGNAL))
+		return false;
+	return true;
+}
+
+static bool enable_gc(struct tsnep_adapter *adapter, bool a)
+{
+	u8 enable;
+	u8 active;
+
+	if (a) {
+		enable = TSNEP_GC_ENABLE_A;
+		active = TSNEP_GC_ACTIVE_A;
+	} else {
+		enable = TSNEP_GC_ENABLE_B;
+		active = TSNEP_GC_ACTIVE_B;
+	}
+
+	iowrite8(enable, adapter->addr + TSNEP_GC);
+	if (!(ioread32(adapter->addr + TSNEP_GC) & active))
+		return false;
+
+	return true;
+}
+
+static bool disable_gc(struct tsnep_adapter *adapter)
+{
+	iowrite8(TSNEP_GC_DISABLE, adapter->addr + TSNEP_GC);
+	if (ioread32(adapter->addr + TSNEP_GC) &
+	    (TSNEP_GC_ACTIVE_A | TSNEP_GC_ACTIVE_B))
+		return false;
+
+	return true;
+}
+
+static bool gc_delayed_enable(struct tsnep_adapter *adapter, bool a, int delay)
+{
+	u64 before, after;
+	u32 time;
+	bool enabled;
+
+	if (!disable_gc(adapter))
+		return false;
+
+	before = ktime_get_ns();
+
+	if (!enable_gc_timeout(adapter))
+		return false;
+
+	/* for start time after timeout, the timeout can guarantee, that enable
+	 * is blocked if too late
+	 */
+	time = ioread32(adapter->addr + ECM_SYSTEM_TIME_LOW);
+	time += TSNEP_GC_TIMEOUT;
+	iowrite32(time, adapter->addr + TSNEP_GC_TIME);
+
+	ndelay(delay);
+
+	enabled = enable_gc(adapter, a);
+	after = ktime_get_ns();
+
+	if (delay > TSNEP_GC_TIMEOUT) {
+		/* timeout must have blocked enable */
+		if (enabled)
+			return false;
+	} else if ((after - before) < TSNEP_GC_TIMEOUT * 14 / 16) {
+		/* timeout must not have blocked enable */
+		if (!enabled)
+			return false;
+	}
+
+	if (enabled) {
+		if (gc_timeout_signaled(adapter))
+			return false;
+	} else {
+		if (!gc_timeout_signaled(adapter))
+			return false;
+		if (!ack_gc_timeout(adapter))
+			return false;
+	}
+
+	if (!disable_gc(adapter))
+		return false;
+
+	return true;
+}
+
+static bool tsnep_test_gc_enable(struct tsnep_adapter *adapter)
+{
+	int i;
+
+	iowrite32(0x80000001, adapter->addr + TSNEP_GCL_A + 0);
+	iowrite32(100000, adapter->addr + TSNEP_GCL_A + 4);
+
+	for (i = 0; i < 200000; i += 100) {
+		if (!gc_delayed_enable(adapter, true, i))
+			return false;
+	}
+
+	iowrite32(0x80000001, adapter->addr + TSNEP_GCL_B + 0);
+	iowrite32(100000, adapter->addr + TSNEP_GCL_B + 4);
+
+	for (i = 0; i < 200000; i += 100) {
+		if (!gc_delayed_enable(adapter, false, i))
+			return false;
+	}
+
+	return true;
+}
+
+static void delay_base_time(struct tsnep_adapter *adapter,
+			    struct tc_taprio_qopt_offload *qopt, s64 ms)
+{
+	u64 system_time;
+	u64 base_time = ktime_to_ns(qopt->base_time);
+	u64 n;
+
+	tsnep_get_system_time(adapter, &system_time);
+	system_time += ms * 1000000;
+	n = div64_u64(system_time - base_time, qopt->cycle_time);
+
+	qopt->base_time = ktime_add_ns(qopt->base_time,
+				       (n + 1) * qopt->cycle_time);
+}
+
+static void get_gate_state(struct tsnep_adapter *adapter, u32 *gc, u32 *gc_time,
+			   u64 *system_time)
+{
+	u32 time_high_before;
+	u32 time_low;
+	u32 time_high;
+	u32 gc_time_before;
+
+	time_high = ioread32(adapter->addr + ECM_SYSTEM_TIME_HIGH);
+	*gc_time = ioread32(adapter->addr + TSNEP_GC_TIME);
+	do {
+		time_low = ioread32(adapter->addr + ECM_SYSTEM_TIME_LOW);
+		*gc = ioread32(adapter->addr + TSNEP_GC);
+
+		gc_time_before = *gc_time;
+		*gc_time = ioread32(adapter->addr + TSNEP_GC_TIME);
+		time_high_before = time_high;
+		time_high = ioread32(adapter->addr + ECM_SYSTEM_TIME_HIGH);
+	} while ((time_high != time_high_before) ||
+		 (*gc_time != gc_time_before));
+
+	*system_time = (((u64)time_high) << 32) | ((u64)time_low);
+}
+
+static int get_operation(struct tsnep_gcl *gcl, u64 system_time, u64 *next)
+{
+	u64 n = div64_u64(system_time - gcl->base_time, gcl->cycle_time);
+	u64 cycle_start = gcl->base_time + gcl->cycle_time * n;
+	int i;
+
+	*next = cycle_start;
+	for (i = 0; i < gcl->count; i++) {
+		*next += gcl->operation[i].interval;
+		if (*next > system_time)
+			break;
+	}
+
+	return i;
+}
+
+static bool check_gate(struct tsnep_adapter *adapter)
+{
+	u32 gc_time;
+	u32 gc;
+	u64 system_time;
+	struct tsnep_gcl *curr;
+	struct tsnep_gcl *prev;
+	u64 next_time;
+	u8 gate_open;
+	u8 next_gate_open;
+
+	get_gate_state(adapter, &gc, &gc_time, &system_time);
+
+	if (gc & TSNEP_GC_ACTIVE_A) {
+		curr = &adapter->gcl[0];
+		prev = &adapter->gcl[1];
+	} else if (gc & TSNEP_GC_ACTIVE_B) {
+		curr = &adapter->gcl[1];
+		prev = &adapter->gcl[0];
+	} else {
+		return false;
+	}
+	if (curr->start_time <= system_time) {
+		/* GCL is already active */
+		int index;
+
+		index = get_operation(curr, system_time, &next_time);
+		gate_open = curr->operation[index].properties & TSNEP_GCL_MASK;
+		if (index == curr->count - 1)
+			index = 0;
+		else
+			index++;
+		next_gate_open =
+			curr->operation[index].properties & TSNEP_GCL_MASK;
+	} else if (curr->change) {
+		/* operation of previous GCL is active */
+		int index;
+		u64 start_before;
+		u64 n;
+
+		index = get_operation(prev, system_time, &next_time);
+		next_time = curr->start_time;
+		start_before = prev->base_time;
+		n = div64_u64(curr->start_time - start_before,
+			      prev->cycle_time);
+		start_before += n * prev->cycle_time;
+		if (curr->start_time == start_before)
+			start_before -= prev->cycle_time;
+		if (((start_before + prev->cycle_time_extension) >=
+		     curr->start_time) &&
+		    (curr->start_time - prev->cycle_time_extension <=
+		     system_time)) {
+			/* extend */
+			index = prev->count - 1;
+		}
+		gate_open = prev->operation[index].properties & TSNEP_GCL_MASK;
+		next_gate_open =
+			curr->operation[0].properties & TSNEP_GCL_MASK;
+	} else {
+		/* GCL is waiting for start */
+		next_time = curr->start_time;
+		gate_open = 0xFF;
+		next_gate_open = curr->operation[0].properties & TSNEP_GCL_MASK;
+	}
+
+	if (gc_time != (next_time & 0xFFFFFFFF)) {
+		dev_err(&adapter->pdev->dev, "gate control time 0x%x!=0x%llx\n",
+			gc_time, next_time);
+		return false;
+	}
+	if (((gc & TSNEP_GC_OPEN) >> TSNEP_GC_OPEN_SHIFT) != gate_open) {
+		dev_err(&adapter->pdev->dev,
+			"gate control open 0x%02x!=0x%02x\n",
+			((gc & TSNEP_GC_OPEN) >> TSNEP_GC_OPEN_SHIFT),
+			gate_open);
+		return false;
+	}
+	if (((gc & TSNEP_GC_NEXT_OPEN) >> TSNEP_GC_NEXT_OPEN_SHIFT) !=
+	    next_gate_open) {
+		dev_err(&adapter->pdev->dev,
+			"gate control next open 0x%02x!=0x%02x\n",
+			((gc & TSNEP_GC_NEXT_OPEN) >> TSNEP_GC_NEXT_OPEN_SHIFT),
+			next_gate_open);
+		return false;
+	}
+
+	return true;
+}
+
+static bool check_gate_duration(struct tsnep_adapter *adapter, s64 ms)
+{
+	ktime_t start = ktime_get();
+
+	do {
+		if (!check_gate(adapter))
+			return false;
+	} while (ktime_ms_delta(ktime_get(), start) < ms);
+
+	return true;
+}
+
+static bool enable_check_taprio(struct tsnep_adapter *adapter,
+				struct tc_taprio_qopt_offload *qopt, s64 ms)
+{
+	int retval;
+
+	retval = tsnep_tc_setup(adapter->netdev, TC_SETUP_QDISC_TAPRIO, qopt);
+	if (retval)
+		return false;
+
+	if (!check_gate_duration(adapter, ms))
+		return false;
+
+	return true;
+}
+
+static bool disable_taprio(struct tsnep_adapter *adapter)
+{
+	struct tc_taprio_qopt_offload qopt;
+	int retval;
+
+	memset(&qopt, 0, sizeof(qopt));
+	qopt.enable = 0;
+	retval = tsnep_tc_setup(adapter->netdev, TC_SETUP_QDISC_TAPRIO, &qopt);
+	if (retval)
+		return false;
+
+	return true;
+}
+
+static bool run_taprio(struct tsnep_adapter *adapter,
+		       struct tc_taprio_qopt_offload *qopt, s64 ms)
+{
+	if (!enable_check_taprio(adapter, qopt, ms))
+		return false;
+
+	if (!disable_taprio(adapter))
+		return false;
+
+	return true;
+}
+
+static bool tsnep_test_taprio(struct tsnep_adapter *adapter)
+{
+	struct tc_taprio_qopt_offload *qopt;
+	int i;
+
+	qopt = kzalloc(struct_size(qopt, entries, 255), GFP_KERNEL);
+	if (!qopt)
+		return false;
+	for (i = 0; i < 255; i++)
+		qopt->entries[i].command = TC_TAPRIO_CMD_SET_GATES;
+
+	qopt->enable = 1;
+	qopt->base_time = ktime_set(0, 0);
+	qopt->cycle_time = 1500000;
+	qopt->cycle_time_extension = 0;
+	qopt->entries[0].gate_mask = 0x02;
+	qopt->entries[0].interval = 200000;
+	qopt->entries[1].gate_mask = 0x03;
+	qopt->entries[1].interval = 800000;
+	qopt->entries[2].gate_mask = 0x07;
+	qopt->entries[2].interval = 240000;
+	qopt->entries[3].gate_mask = 0x01;
+	qopt->entries[3].interval = 80000;
+	qopt->entries[4].gate_mask = 0x04;
+	qopt->entries[4].interval = 70000;
+	qopt->entries[5].gate_mask = 0x06;
+	qopt->entries[5].interval = 60000;
+	qopt->entries[6].gate_mask = 0x0F;
+	qopt->entries[6].interval = 50000;
+	qopt->num_entries = 7;
+	if (!run_taprio(adapter, qopt, 100))
+		goto failed;
+
+	qopt->enable = 1;
+	qopt->base_time = ktime_set(0, 0);
+	qopt->cycle_time = 411854;
+	qopt->cycle_time_extension = 0;
+	qopt->entries[0].gate_mask = 0x17;
+	qopt->entries[0].interval = 23842;
+	qopt->entries[1].gate_mask = 0x16;
+	qopt->entries[1].interval = 13482;
+	qopt->entries[2].gate_mask = 0x15;
+	qopt->entries[2].interval = 49428;
+	qopt->entries[3].gate_mask = 0x14;
+	qopt->entries[3].interval = 38189;
+	qopt->entries[4].gate_mask = 0x13;
+	qopt->entries[4].interval = 92321;
+	qopt->entries[5].gate_mask = 0x12;
+	qopt->entries[5].interval = 71239;
+	qopt->entries[6].gate_mask = 0x11;
+	qopt->entries[6].interval = 69932;
+	qopt->entries[7].gate_mask = 0x10;
+	qopt->entries[7].interval = 53421;
+	qopt->num_entries = 8;
+	if (!run_taprio(adapter, qopt, 100))
+		goto failed;
+
+	qopt->enable = 1;
+	qopt->base_time = ktime_set(0, 0);
+	delay_base_time(adapter, qopt, 12);
+	qopt->cycle_time = 125000;
+	qopt->cycle_time_extension = 0;
+	qopt->entries[0].gate_mask = 0x27;
+	qopt->entries[0].interval = 15000;
+	qopt->entries[1].gate_mask = 0x26;
+	qopt->entries[1].interval = 15000;
+	qopt->entries[2].gate_mask = 0x25;
+	qopt->entries[2].interval = 12500;
+	qopt->entries[3].gate_mask = 0x24;
+	qopt->entries[3].interval = 17500;
+	qopt->entries[4].gate_mask = 0x23;
+	qopt->entries[4].interval = 10000;
+	qopt->entries[5].gate_mask = 0x22;
+	qopt->entries[5].interval = 11000;
+	qopt->entries[6].gate_mask = 0x21;
+	qopt->entries[6].interval = 9000;
+	qopt->entries[7].gate_mask = 0x20;
+	qopt->entries[7].interval = 10000;
+	qopt->entries[8].gate_mask = 0x20;
+	qopt->entries[8].interval = 12500;
+	qopt->entries[9].gate_mask = 0x20;
+	qopt->entries[9].interval = 12500;
+	qopt->num_entries = 10;
+	if (!run_taprio(adapter, qopt, 100))
+		goto failed;
+
+	kfree(qopt);
+
+	return true;
+
+failed:
+	disable_taprio(adapter);
+	kfree(qopt);
+
+	return false;
+}
+
+static bool tsnep_test_taprio_change(struct tsnep_adapter *adapter)
+{
+	struct tc_taprio_qopt_offload *qopt;
+	int i;
+
+	qopt = kzalloc(struct_size(qopt, entries, 255), GFP_KERNEL);
+	if (!qopt)
+		return false;
+	for (i = 0; i < 255; i++)
+		qopt->entries[i].command = TC_TAPRIO_CMD_SET_GATES;
+
+	qopt->enable = 1;
+	qopt->base_time = ktime_set(0, 0);
+	qopt->cycle_time = 100000;
+	qopt->cycle_time_extension = 0;
+	qopt->entries[0].gate_mask = 0x30;
+	qopt->entries[0].interval = 20000;
+	qopt->entries[1].gate_mask = 0x31;
+	qopt->entries[1].interval = 80000;
+	qopt->num_entries = 2;
+	if (!enable_check_taprio(adapter, qopt, 100))
+		goto failed;
+
+	/* change to identical */
+	if (!enable_check_taprio(adapter, qopt, 100))
+		goto failed;
+	delay_base_time(adapter, qopt, 17);
+	if (!enable_check_taprio(adapter, qopt, 100))
+		goto failed;
+
+	/* change to same cycle time */
+	qopt->base_time = ktime_set(0, 0);
+	qopt->entries[0].gate_mask = 0x42;
+	qopt->entries[1].gate_mask = 0x43;
+	delay_base_time(adapter, qopt, 2);
+	if (!enable_check_taprio(adapter, qopt, 100))
+		goto failed;
+	qopt->base_time = ktime_set(0, 0);
+	qopt->entries[0].gate_mask = 0x54;
+	qopt->entries[0].interval = 33333;
+	qopt->entries[1].gate_mask = 0x55;
+	qopt->entries[1].interval = 66667;
+	delay_base_time(adapter, qopt, 23);
+	if (!enable_check_taprio(adapter, qopt, 100))
+		goto failed;
+	qopt->base_time = ktime_set(0, 0);
+	qopt->entries[0].gate_mask = 0x66;
+	qopt->entries[0].interval = 50000;
+	qopt->entries[1].gate_mask = 0x67;
+	qopt->entries[1].interval = 25000;
+	qopt->entries[2].gate_mask = 0x68;
+	qopt->entries[2].interval = 25000;
+	qopt->num_entries = 3;
+	delay_base_time(adapter, qopt, 11);
+	if (!enable_check_taprio(adapter, qopt, 100))
+		goto failed;
+
+	/* change to multiple of cycle time */
+	qopt->base_time = ktime_set(0, 0);
+	qopt->cycle_time = 200000;
+	qopt->entries[0].gate_mask = 0x79;
+	qopt->entries[0].interval = 50000;
+	qopt->entries[1].gate_mask = 0x7A;
+	qopt->entries[1].interval = 150000;
+	qopt->num_entries = 2;
+	delay_base_time(adapter, qopt, 11);
+	if (!enable_check_taprio(adapter, qopt, 100))
+		goto failed;
+	qopt->base_time = ktime_set(0, 0);
+	qopt->cycle_time = 1000000;
+	qopt->entries[0].gate_mask = 0x7B;
+	qopt->entries[0].interval = 125000;
+	qopt->entries[1].gate_mask = 0x7C;
+	qopt->entries[1].interval = 250000;
+	qopt->entries[2].gate_mask = 0x7D;
+	qopt->entries[2].interval = 375000;
+	qopt->entries[3].gate_mask = 0x7E;
+	qopt->entries[3].interval = 250000;
+	qopt->num_entries = 4;
+	delay_base_time(adapter, qopt, 3);
+	if (!enable_check_taprio(adapter, qopt, 100))
+		goto failed;
+
+	/* change to shorter cycle time */
+	qopt->base_time = ktime_set(0, 0);
+	qopt->cycle_time = 333333;
+	qopt->entries[0].gate_mask = 0x8F;
+	qopt->entries[0].interval = 166666;
+	qopt->entries[1].gate_mask = 0x80;
+	qopt->entries[1].interval = 166667;
+	qopt->num_entries = 2;
+	delay_base_time(adapter, qopt, 11);
+	if (!enable_check_taprio(adapter, qopt, 100))
+		goto failed;
+	qopt->base_time = ktime_set(0, 0);
+	qopt->cycle_time = 62500;
+	qopt->entries[0].gate_mask = 0x81;
+	qopt->entries[0].interval = 31250;
+	qopt->entries[1].gate_mask = 0x82;
+	qopt->entries[1].interval = 15625;
+	qopt->entries[2].gate_mask = 0x83;
+	qopt->entries[2].interval = 15625;
+	qopt->num_entries = 3;
+	delay_base_time(adapter, qopt, 1);
+	if (!enable_check_taprio(adapter, qopt, 100))
+		goto failed;
+
+	/* change to longer cycle time */
+	qopt->base_time = ktime_set(0, 0);
+	qopt->cycle_time = 400000;
+	qopt->entries[0].gate_mask = 0x84;
+	qopt->entries[0].interval = 100000;
+	qopt->entries[1].gate_mask = 0x85;
+	qopt->entries[1].interval = 100000;
+	qopt->entries[2].gate_mask = 0x86;
+	qopt->entries[2].interval = 100000;
+	qopt->entries[3].gate_mask = 0x87;
+	qopt->entries[3].interval = 100000;
+	qopt->num_entries = 4;
+	delay_base_time(adapter, qopt, 7);
+	if (!enable_check_taprio(adapter, qopt, 100))
+		goto failed;
+	qopt->base_time = ktime_set(0, 0);
+	qopt->cycle_time = 1700000;
+	qopt->entries[0].gate_mask = 0x88;
+	qopt->entries[0].interval = 200000;
+	qopt->entries[1].gate_mask = 0x89;
+	qopt->entries[1].interval = 300000;
+	qopt->entries[2].gate_mask = 0x8A;
+	qopt->entries[2].interval = 600000;
+	qopt->entries[3].gate_mask = 0x8B;
+	qopt->entries[3].interval = 100000;
+	qopt->entries[4].gate_mask = 0x8C;
+	qopt->entries[4].interval = 500000;
+	qopt->num_entries = 5;
+	delay_base_time(adapter, qopt, 6);
+	if (!enable_check_taprio(adapter, qopt, 100))
+		goto failed;
+
+	if (!disable_taprio(adapter))
+		goto failed;
+
+	kfree(qopt);
+
+	return true;
+
+failed:
+	disable_taprio(adapter);
+	kfree(qopt);
+
+	return false;
+}
+
+static bool tsnep_test_taprio_extension(struct tsnep_adapter *adapter)
+{
+	struct tc_taprio_qopt_offload *qopt;
+	int i;
+
+	qopt = kzalloc(struct_size(qopt, entries, 255), GFP_KERNEL);
+	if (!qopt)
+		return false;
+	for (i = 0; i < 255; i++)
+		qopt->entries[i].command = TC_TAPRIO_CMD_SET_GATES;
+
+	qopt->enable = 1;
+	qopt->base_time = ktime_set(0, 0);
+	qopt->cycle_time = 100000;
+	qopt->cycle_time_extension = 50000;
+	qopt->entries[0].gate_mask = 0x90;
+	qopt->entries[0].interval = 20000;
+	qopt->entries[1].gate_mask = 0x91;
+	qopt->entries[1].interval = 80000;
+	qopt->num_entries = 2;
+	if (!enable_check_taprio(adapter, qopt, 100))
+		goto failed;
+
+	/* change to different phase */
+	qopt->base_time = ktime_set(0, 50000);
+	qopt->entries[0].gate_mask = 0x92;
+	qopt->entries[0].interval = 33000;
+	qopt->entries[1].gate_mask = 0x93;
+	qopt->entries[1].interval = 67000;
+	qopt->num_entries = 2;
+	delay_base_time(adapter, qopt, 2);
+	if (!enable_check_taprio(adapter, qopt, 100))
+		goto failed;
+
+	/* change to different phase and longer cycle time */
+	qopt->base_time = ktime_set(0, 0);
+	qopt->cycle_time = 1000000;
+	qopt->cycle_time_extension = 700000;
+	qopt->entries[0].gate_mask = 0x94;
+	qopt->entries[0].interval = 400000;
+	qopt->entries[1].gate_mask = 0x95;
+	qopt->entries[1].interval = 600000;
+	qopt->num_entries = 2;
+	delay_base_time(adapter, qopt, 7);
+	if (!enable_check_taprio(adapter, qopt, 100))
+		goto failed;
+	qopt->base_time = ktime_set(0, 700000);
+	qopt->cycle_time = 2000000;
+	qopt->cycle_time_extension = 1900000;
+	qopt->entries[0].gate_mask = 0x96;
+	qopt->entries[0].interval = 400000;
+	qopt->entries[1].gate_mask = 0x97;
+	qopt->entries[1].interval = 1600000;
+	qopt->num_entries = 2;
+	delay_base_time(adapter, qopt, 9);
+	if (!enable_check_taprio(adapter, qopt, 100))
+		goto failed;
+
+	/* change to different phase and shorter cycle time */
+	qopt->base_time = ktime_set(0, 0);
+	qopt->cycle_time = 1500000;
+	qopt->cycle_time_extension = 700000;
+	qopt->entries[0].gate_mask = 0x98;
+	qopt->entries[0].interval = 400000;
+	qopt->entries[1].gate_mask = 0x99;
+	qopt->entries[1].interval = 600000;
+	qopt->entries[2].gate_mask = 0x9A;
+	qopt->entries[2].interval = 500000;
+	qopt->num_entries = 3;
+	delay_base_time(adapter, qopt, 3);
+	if (!enable_check_taprio(adapter, qopt, 100))
+		goto failed;
+	qopt->base_time = ktime_set(0, 100000);
+	qopt->cycle_time = 500000;
+	qopt->cycle_time_extension = 300000;
+	qopt->entries[0].gate_mask = 0x9B;
+	qopt->entries[0].interval = 150000;
+	qopt->entries[1].gate_mask = 0x9C;
+	qopt->entries[1].interval = 350000;
+	qopt->num_entries = 2;
+	delay_base_time(adapter, qopt, 9);
+	if (!enable_check_taprio(adapter, qopt, 100))
+		goto failed;
+
+	/* change to different cycle time */
+	qopt->base_time = ktime_set(0, 0);
+	qopt->cycle_time = 1000000;
+	qopt->cycle_time_extension = 700000;
+	qopt->entries[0].gate_mask = 0xAD;
+	qopt->entries[0].interval = 400000;
+	qopt->entries[1].gate_mask = 0xAE;
+	qopt->entries[1].interval = 300000;
+	qopt->entries[2].gate_mask = 0xAF;
+	qopt->entries[2].interval = 300000;
+	qopt->num_entries = 3;
+	if (!enable_check_taprio(adapter, qopt, 100))
+		goto failed;
+	qopt->base_time = ktime_set(0, 0);
+	qopt->cycle_time = 400000;
+	qopt->cycle_time_extension = 100000;
+	qopt->entries[0].gate_mask = 0xA0;
+	qopt->entries[0].interval = 200000;
+	qopt->entries[1].gate_mask = 0xA1;
+	qopt->entries[1].interval = 200000;
+	qopt->num_entries = 2;
+	delay_base_time(adapter, qopt, 19);
+	if (!enable_check_taprio(adapter, qopt, 100))
+		goto failed;
+	qopt->base_time = ktime_set(0, 0);
+	qopt->cycle_time = 500000;
+	qopt->cycle_time_extension = 499999;
+	qopt->entries[0].gate_mask = 0xB2;
+	qopt->entries[0].interval = 100000;
+	qopt->entries[1].gate_mask = 0xB3;
+	qopt->entries[1].interval = 100000;
+	qopt->entries[2].gate_mask = 0xB4;
+	qopt->entries[2].interval = 100000;
+	qopt->entries[3].gate_mask = 0xB5;
+	qopt->entries[3].interval = 200000;
+	qopt->num_entries = 4;
+	delay_base_time(adapter, qopt, 19);
+	if (!enable_check_taprio(adapter, qopt, 100))
+		goto failed;
+	qopt->base_time = ktime_set(0, 0);
+	qopt->cycle_time = 6000000;
+	qopt->cycle_time_extension = 5999999;
+	qopt->entries[0].gate_mask = 0xC6;
+	qopt->entries[0].interval = 1000000;
+	qopt->entries[1].gate_mask = 0xC7;
+	qopt->entries[1].interval = 1000000;
+	qopt->entries[2].gate_mask = 0xC8;
+	qopt->entries[2].interval = 1000000;
+	qopt->entries[3].gate_mask = 0xC9;
+	qopt->entries[3].interval = 1500000;
+	qopt->entries[4].gate_mask = 0xCA;
+	qopt->entries[4].interval = 1500000;
+	qopt->num_entries = 5;
+	delay_base_time(adapter, qopt, 1);
+	if (!enable_check_taprio(adapter, qopt, 100))
+		goto failed;
+
+	if (!disable_taprio(adapter))
+		goto failed;
+
+	kfree(qopt);
+
+	return true;
+
+failed:
+	disable_taprio(adapter);
+	kfree(qopt);
+
+	return false;
+}
+
+int tsnep_get_test_count(void)
+{
+	return TSNEP_TEST_COUNT;
+}
+
+void tsnep_get_test_strings(u8 *data)
+{
+	memcpy(data, tsnep_test_strings, sizeof(tsnep_test_strings));
+}
+
+void tsnep_self_test(struct net_device *netdev, struct ethtool_test *eth_test,
+		     u64 *data)
+{
+	struct tsnep_adapter *adapter = netdev_priv(netdev);
+
+	eth_test->len = TSNEP_TEST_COUNT;
+
+	if (eth_test->flags != ETH_TEST_FL_OFFLINE) {
+		/* no tests are done online */
+		data[TSNEP_TEST_ENABLE] = 0;
+		data[TSNEP_TEST_TAPRIO] = 0;
+		data[TSNEP_TEST_TAPRIO_CHANGE] = 0;
+		data[TSNEP_TEST_TAPRIO_EXTENSION] = 0;
+
+		return;
+	}
+
+	if (tsnep_test_gc_enable(adapter)) {
+		data[TSNEP_TEST_ENABLE] = 0;
+	} else {
+		eth_test->flags |= ETH_TEST_FL_FAILED;
+		data[TSNEP_TEST_ENABLE] = 1;
+	}
+
+	if (tsnep_test_taprio(adapter)) {
+		data[TSNEP_TEST_TAPRIO] = 0;
+	} else {
+		eth_test->flags |= ETH_TEST_FL_FAILED;
+		data[TSNEP_TEST_TAPRIO] = 1;
+	}
+
+	if (tsnep_test_taprio_change(adapter)) {
+		data[TSNEP_TEST_TAPRIO_CHANGE] = 0;
+	} else {
+		eth_test->flags |= ETH_TEST_FL_FAILED;
+		data[TSNEP_TEST_TAPRIO_CHANGE] = 1;
+	}
+
+	if (tsnep_test_taprio_extension(adapter)) {
+		data[TSNEP_TEST_TAPRIO_EXTENSION] = 0;
+	} else {
+		eth_test->flags |= ETH_TEST_FL_FAILED;
+		data[TSNEP_TEST_TAPRIO_EXTENSION] = 1;
+	}
+}
-- 
2.20.1


  parent reply	other threads:[~2021-07-26 19:46 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-26 19:45 [PATCH net-next 0/5] " Gerhard Engleder
2021-07-26 19:45 ` [PATCH net-next 1/5] dt-bindings: Add vendor prefix for Engleder Gerhard Engleder
2021-07-26 19:46 ` [PATCH net-next 2/5] dt-bindings: net: Add tsnep Ethernet controller Gerhard Engleder
2021-07-26 23:35   ` Rob Herring
2021-07-27 18:34     ` Gerhard Engleder
2021-07-27 20:25       ` Rob Herring
2021-07-27 20:33         ` Gerhard Engleder
2021-07-28  5:13         ` Michal Simek
2021-07-28  7:44           ` Gerhard Engleder
2021-07-28 10:55             ` Michal Simek
2021-07-28 20:14               ` Gerhard Engleder
2021-07-29  5:07                 ` Michal Simek
2021-07-29  7:07                   ` Gerhard Engleder
2021-07-29  7:57                     ` Michal Simek
2021-07-26 19:46 ` [PATCH net-next 3/5] dt-bindings: arm: Add Engleder bindings Gerhard Engleder
2021-07-26 19:46 ` Gerhard Engleder [this message]
2021-07-26 20:49   ` [PATCH net-next 4/5] tsnep: Add TSN endpoint Ethernet MAC driver Andrew Lunn
2021-07-27 20:18     ` Gerhard Engleder
2021-07-26 21:15   ` Andrew Lunn
2021-07-27 20:49     ` Gerhard Engleder
2021-07-26 21:29   ` Andrew Lunn
2021-07-27 22:05     ` Gerhard Engleder
2021-07-27 22:41       ` Andrew Lunn
2021-07-28  8:24         ` Gerhard Engleder
2021-07-26 23:25   ` kernel test robot
2021-07-26 19:46 ` [PATCH net-next 5/5] arm64: dts: zynqmp: Add ZCU104 based TSN endpoint Gerhard Engleder
2021-07-26 23:40   ` Rob Herring
2021-07-27 20:10     ` Gerhard Engleder
2021-07-27 20:17       ` Rob Herring
2021-07-27 20:23         ` Gerhard Engleder
2021-07-28  5:10           ` Michal Simek
2021-07-28  8:19             ` Gerhard Engleder
2021-07-28 10:58               ` Michal Simek
2021-07-28 20:51                 ` Gerhard Engleder
2021-07-29  5:22                   ` Michal Simek
2021-07-29  6:47                     ` Gerhard Engleder

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