Merge branch 'add-ethernet-driver-for-tehuti-networks-tn40xx-chips'

FUJITA Tomonori says:

====================
add ethernet driver for Tehuti Networks TN40xx chips

This patchset adds a new 10G ethernet driver for Tehuti Networks
TN40xx chips. Note in mainline, there is a driver for Tehuti Networks
(drivers/net/ethernet/tehuti/tehuti.[hc]), which supports TN30xx
chips.

Multiple vendors (DLink, Asus, Edimax, QNAP, etc) developed adapters
based on TN40xx chips. Tehuti Networks went out of business but the
drivers are still distributed under GPL2 with some of the hardware
(and also available on some sites). With some changes, I try to
upstream this driver with a new PHY driver in Rust.

The major change is replacing the PHY abstraction layer in the original
driver with phylink. TN40xx chips are used with various PHY hardware
(AMCC QT2025, TI TLK10232, Aqrate AQR105, and Marvell MV88X3120,
MV88X3310, and MV88E2010).

I've also been working on a new PHY driver for QT2025 in Rust [1]. For
now, I enable only adapters using QT2025 PHY in the PCI ID table of
this driver. I've tested this driver and the QT2025 PHY driver with
Edimax EN-9320 10G adapter and 10G-SR SFP+. In mainline, there are PHY
drivers for AQR105 and Marvell PHYs, which could work for some TN40xx
adapters with this driver.

To make reviewing easier, this patchset has only basic functions. Once
merged, I'll submit features like ethtool support.

v11: https://lore.kernel.org/netdev/20240618051608.95208-7-fujita.tomonori@gmail.com/
v10: https://lore.kernel.org/netdev/20240611045217.78529-7-fujita.tomonori@gmail.com/
v9: https://lore.kernel.org/netdev/20240605232608.65471-1-fujita.tomonori@gmail.com/
v8: https://lore.kernel.org/netdev/20240603064955.58327-1-fujita.tomonori@gmail.com/
v7: https://lore.kernel.org/netdev/20240527203928.38206-7-fujita.tomonori@gmail.com/
v6: https://lore.kernel.org/netdev/20240512085611.79747-2-fujita.tomonori@gmail.com/
v5: https://lore.kernel.org/netdev/20240508113947.68530-1-fujita.tomonori@gmail.com/
v4: https://lore.kernel.org/netdev/20240501230552.53185-1-fujita.tomonori@gmail.com/
v3: https://lore.kernel.org/netdev/20240429043827.44407-1-fujita.tomonori@gmail.com/
v2: https://lore.kernel.org/netdev/20240425010354.32605-1-fujita.tomonori@gmail.com/
v1: https://lore.kernel.org/netdev/20240415104352.4685-1-fujita.tomonori@gmail.com/

[1] https://lore.kernel.org/netdev/20240415104701.4772-1-fujita.tomonori@gmail.com/
====================

Link: https://patch.msgid.link/20240623235507.108147-1-fujita.tomonori@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

MAINTAINERS

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

drivers/net/ethernet/tehuti/Kconfig

@@ -23,4 +23,19 @@ config TEHUTI
 	help
 	  Tehuti Networks 10G Ethernet NIC
 
+config TEHUTI_TN40
+	tristate "Tehuti Networks TN40xx 10G Ethernet adapters"
+	depends on PCI
+	select PAGE_POOL
+	select FW_LOADER
+	select PHYLINK
+	help
+	  This driver supports 10G Ethernet adapters using Tehuti Networks
+	  TN40xx chips. Currently, adapters with Applied Micro Circuits
+	  Corporation QT2025 are supported; Tehuti Networks TN9310,
+	  DLink DXE-810S, ASUS XG-C100F, and Edimax EN-9320.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called tn40xx.
+
 endif # NET_VENDOR_TEHUTI

drivers/net/ethernet/tehuti/Makefile

@@ -4,3 +4,6 @@
 #
 
 obj-$(CONFIG_TEHUTI) += tehuti.o
+
+tn40xx-y := tn40.o tn40_mdio.o tn40_phy.o
+obj-$(CONFIG_TEHUTI_TN40) += tn40xx.o

drivers/net/ethernet/tehuti/tn40.c

+// SPDX-License-Identifier: GPL-2.0+
+/* Copyright (c) Tehuti Networks Ltd. */
+
+#include <linux/bitfield.h>
+#include <linux/ethtool.h>
+#include <linux/firmware.h>
+#include <linux/if_vlan.h>
+#include <linux/iopoll.h>
+#include <linux/netdevice.h>
+#include <linux/pci.h>
+#include <linux/phylink.h>
+#include <linux/vmalloc.h>
+#include <net/page_pool/helpers.h>
+
+#include "tn40.h"
+
+#define TN40_SHORT_PACKET_SIZE 60
+#define TN40_FIRMWARE_NAME "tehuti/bdx.bin"
+
+static void tn40_enable_interrupts(struct tn40_priv *priv)
+{
+	tn40_write_reg(priv, TN40_REG_IMR, priv->isr_mask);
+}
+
+static void tn40_disable_interrupts(struct tn40_priv *priv)
+{
+	tn40_write_reg(priv, TN40_REG_IMR, 0);
+}
+
+static int tn40_fifo_alloc(struct tn40_priv *priv, struct tn40_fifo *f,
+			   int fsz_type,
+			   u16 reg_cfg0, u16 reg_cfg1,
+			   u16 reg_rptr, u16 reg_wptr)
+{
+	u16 memsz = TN40_FIFO_SIZE * (1 << fsz_type);
+	u64 cfg_base;
+
+	memset(f, 0, sizeof(struct tn40_fifo));
+	/* 1K extra space is allocated at the end of the fifo to simplify
+	 * processing of descriptors that wraps around fifo's end.
+	 */
+	f->va = dma_alloc_coherent(&priv->pdev->dev,
+				   memsz + TN40_FIFO_EXTRA_SPACE, &f->da,
+				   GFP_KERNEL);
+	if (!f->va)
+		return -ENOMEM;
+
+	f->reg_cfg0 = reg_cfg0;
+	f->reg_cfg1 = reg_cfg1;
+	f->reg_rptr = reg_rptr;
+	f->reg_wptr = reg_wptr;
+	f->rptr = 0;
+	f->wptr = 0;
+	f->memsz = memsz;
+	f->size_mask = memsz - 1;
+	cfg_base = lower_32_bits((f->da & TN40_TX_RX_CFG0_BASE) | fsz_type);
+	tn40_write_reg(priv, reg_cfg0, cfg_base);
+	tn40_write_reg(priv, reg_cfg1, upper_32_bits(f->da));
+	return 0;
+}
+
+static void tn40_fifo_free(struct tn40_priv *priv, struct tn40_fifo *f)
+{
+	dma_free_coherent(&priv->pdev->dev,
+			  f->memsz + TN40_FIFO_EXTRA_SPACE, f->va, f->da);
+}
+
+static struct tn40_rxdb *tn40_rxdb_alloc(int nelem)
+{
+	size_t size = sizeof(struct tn40_rxdb) + (nelem * sizeof(int)) +
+	    (nelem * sizeof(struct tn40_rx_map));
+	struct tn40_rxdb *db;
+	int i;
+
+	db = vzalloc(size);
+	if (db) {
+		db->stack = (int *)(db + 1);
+		db->elems = (void *)(db->stack + nelem);
+		db->nelem = nelem;
+		db->top = nelem;
+		/* make the first alloc close to db struct */
+		for (i = 0; i < nelem; i++)
+			db->stack[i] = nelem - i - 1;
+	}
+	return db;
+}
+
+static void tn40_rxdb_free(struct tn40_rxdb *db)
+{
+	vfree(db);
+}
+
+static int tn40_rxdb_alloc_elem(struct tn40_rxdb *db)
+{
+	return db->stack[--db->top];
+}
+
+static void *tn40_rxdb_addr_elem(struct tn40_rxdb *db, unsigned int n)
+{
+	return db->elems + n;
+}
+
+static int tn40_rxdb_available(struct tn40_rxdb *db)
+{
+	return db->top;
+}
+
+static void tn40_rxdb_free_elem(struct tn40_rxdb *db, unsigned int n)
+{
+	db->stack[db->top++] = n;
+}
+
+/**
+ * tn40_create_rx_ring - Initialize RX all related HW and SW resources
+ * @priv: NIC private structure
+ *
+ * create_rx_ring creates rxf and rxd fifos, updates the relevant HW registers,
+ * preallocates skbs for rx. It assumes that Rx is disabled in HW funcs are
+ * grouped for better cache usage
+ *
+ * RxD fifo is smaller then RxF fifo by design. Upon high load, RxD will be
+ * filled and packets will be dropped by the NIC without getting into the host
+ * or generating interrupts. In this situation the host has no chance of
+ * processing all the packets. Dropping packets by the NIC is cheaper, since it
+ * takes 0 CPU cycles.
+ *
+ * Return: 0 on success and negative value on error.
+ */
+static int tn40_create_rx_ring(struct tn40_priv *priv)
+{
+	struct page_pool_params pp = {
+		.dev = &priv->pdev->dev,
+		.napi = &priv->napi,
+		.dma_dir = DMA_FROM_DEVICE,
+		.netdev = priv->ndev,
+		.flags = PP_FLAG_DMA_MAP | PP_FLAG_DMA_SYNC_DEV,
+		.max_len = PAGE_SIZE,
+	};
+	int ret, pkt_size, nr;
+
+	priv->page_pool = page_pool_create(&pp);
+	if (IS_ERR(priv->page_pool))
+		return PTR_ERR(priv->page_pool);
+
+	ret = tn40_fifo_alloc(priv, &priv->rxd_fifo0.m, priv->rxd_size,
+			      TN40_REG_RXD_CFG0_0, TN40_REG_RXD_CFG1_0,
+			      TN40_REG_RXD_RPTR_0, TN40_REG_RXD_WPTR_0);
+	if (ret)
+		goto err_destroy_page_pool;
+
+	ret = tn40_fifo_alloc(priv, &priv->rxf_fifo0.m, priv->rxf_size,
+			      TN40_REG_RXF_CFG0_0, TN40_REG_RXF_CFG1_0,
+			      TN40_REG_RXF_RPTR_0, TN40_REG_RXF_WPTR_0);
+	if (ret)
+		goto err_free_rxd;
+
+	pkt_size = priv->ndev->mtu + VLAN_ETH_HLEN;
+	priv->rxf_fifo0.m.pktsz = pkt_size;
+	nr = priv->rxf_fifo0.m.memsz / sizeof(struct tn40_rxf_desc);
+	priv->rxdb0 = tn40_rxdb_alloc(nr);
+	if (!priv->rxdb0) {
+		ret = -ENOMEM;
+		goto err_free_rxf;
+	}
+	return 0;
+err_free_rxf:
+	tn40_fifo_free(priv, &priv->rxf_fifo0.m);
+err_free_rxd:
+	tn40_fifo_free(priv, &priv->rxd_fifo0.m);
+err_destroy_page_pool:
+	page_pool_destroy(priv->page_pool);
+	return ret;
+}
+
+static void tn40_rx_free_buffers(struct tn40_priv *priv)
+{
+	struct tn40_rxdb *db = priv->rxdb0;
+	struct tn40_rx_map *dm;
+	u16 i;
+
+	netdev_dbg(priv->ndev, "total =%d free =%d busy =%d\n", db->nelem,
+		   tn40_rxdb_available(db),
+		   db->nelem - tn40_rxdb_available(db));
+
+	for (i = 0; i < db->nelem; i++) {
+		dm = tn40_rxdb_addr_elem(db, i);
+		if (dm->page)
+			page_pool_put_full_page(priv->page_pool, dm->page,
+						false);
+	}
+}
+
+static void tn40_destroy_rx_ring(struct tn40_priv *priv)
+{
+	if (priv->rxdb0) {
+		tn40_rx_free_buffers(priv);
+		tn40_rxdb_free(priv->rxdb0);
+		priv->rxdb0 = NULL;
+	}
+	tn40_fifo_free(priv, &priv->rxf_fifo0.m);
+	tn40_fifo_free(priv, &priv->rxd_fifo0.m);
+	page_pool_destroy(priv->page_pool);
+}
+
+static void tn40_set_rx_desc(struct tn40_priv *priv, int idx, u64 dma)
+{
+	struct tn40_rxf_fifo *f = &priv->rxf_fifo0;
+	struct tn40_rxf_desc *rxfd;
+	int delta;
+
+	rxfd = (struct tn40_rxf_desc *)(f->m.va + f->m.wptr);
+	rxfd->info = cpu_to_le32(0x10003);	/* INFO =1 BC =3 */
+	rxfd->va_lo = cpu_to_le32(idx);
+	rxfd->pa_lo = cpu_to_le32(lower_32_bits(dma));
+	rxfd->pa_hi = cpu_to_le32(upper_32_bits(dma));
+	rxfd->len = cpu_to_le32(f->m.pktsz);
+	f->m.wptr += sizeof(struct tn40_rxf_desc);
+	delta = f->m.wptr - f->m.memsz;
+	if (unlikely(delta >= 0)) {
+		f->m.wptr = delta;
+		if (delta > 0) {
+			memcpy(f->m.va, f->m.va + f->m.memsz, delta);
+			netdev_dbg(priv->ndev,
+				   "wrapped rxd descriptor\n");
+		}
+	}
+}
+
+/**
+ * tn40_rx_alloc_buffers - Fill rxf fifo with buffers.
+ *
+ * @priv: NIC's private structure
+ *
+ * rx_alloc_buffers allocates buffers via the page pool API, builds rxf descs
+ * and pushes them (rxf descr) into the rxf fifo. The pages are stored in rxdb.
+ * To calculate the free space, we uses the cached values of RPTR and WPTR
+ * when needed. This function also updates RPTR and WPTR.
+ */
+static void tn40_rx_alloc_buffers(struct tn40_priv *priv)
+{
+	struct tn40_rxf_fifo *f = &priv->rxf_fifo0;
+	struct tn40_rxdb *db = priv->rxdb0;
+	struct tn40_rx_map *dm;
+	struct page *page;
+	int dno, i, idx;
+
+	dno = tn40_rxdb_available(db) - 1;
+	for (i = dno; i > 0; i--) {
+		page = page_pool_dev_alloc_pages(priv->page_pool);
+		if (!page)
+			break;
+
+		idx = tn40_rxdb_alloc_elem(db);
+		tn40_set_rx_desc(priv, idx, page_pool_get_dma_addr(page));
+		dm = tn40_rxdb_addr_elem(db, idx);
+		dm->page = page;
+	}
+	if (i != dno)
+		tn40_write_reg(priv, f->m.reg_wptr,
+			       f->m.wptr & TN40_TXF_WPTR_WR_PTR);
+	netdev_dbg(priv->ndev, "write_reg 0x%04x f->m.reg_wptr 0x%x\n",
+		   f->m.reg_wptr, f->m.wptr & TN40_TXF_WPTR_WR_PTR);
+	netdev_dbg(priv->ndev, "read_reg  0x%04x f->m.reg_rptr=0x%x\n",
+		   f->m.reg_rptr, tn40_read_reg(priv, f->m.reg_rptr));
+	netdev_dbg(priv->ndev, "write_reg 0x%04x f->m.reg_wptr=0x%x\n",
+		   f->m.reg_wptr, tn40_read_reg(priv, f->m.reg_wptr));
+}
+
+static void tn40_recycle_rx_buffer(struct tn40_priv *priv,
+				   struct tn40_rxd_desc *rxdd)
+{
+	struct tn40_rxf_fifo *f = &priv->rxf_fifo0;
+	struct tn40_rx_map *dm;
+	int idx;
+
+	idx = le32_to_cpu(rxdd->va_lo);
+	dm = tn40_rxdb_addr_elem(priv->rxdb0, idx);
+	tn40_set_rx_desc(priv, idx, page_pool_get_dma_addr(dm->page));
+
+	tn40_write_reg(priv, f->m.reg_wptr, f->m.wptr & TN40_TXF_WPTR_WR_PTR);
+}
+
+static int tn40_rx_receive(struct tn40_priv *priv, int budget)
+{
+	struct tn40_rxd_fifo *f = &priv->rxd_fifo0;
+	u32 rxd_val1, rxd_err, pkt_id;
+	int tmp_len, size, done = 0;
+	struct tn40_rxdb *db = NULL;
+	struct tn40_rxd_desc *rxdd;
+	struct tn40_rx_map *dm;
+	struct sk_buff *skb;
+	u16 len, rxd_vlan;
+	int idx;
+
+	f->m.wptr = tn40_read_reg(priv, f->m.reg_wptr) & TN40_TXF_WPTR_WR_PTR;
+	size = f->m.wptr - f->m.rptr;
+	if (size < 0)
+		size += f->m.memsz;	/* Size is negative :-) */
+
+	while (size > 0) {
+		rxdd = (struct tn40_rxd_desc *)(f->m.va + f->m.rptr);
+		db = priv->rxdb0;
+
+		/* We have a chicken and egg problem here. If the
+		 * descriptor is wrapped we first need to copy the tail
+		 * of the descriptor to the end of the buffer before
+		 * extracting values from the descriptor. However in
+		 * order to know if the descriptor is wrapped we need to
+		 * obtain the length of the descriptor from (the
+		 * wrapped) descriptor. Luckily the length is the first
+		 * word of the descriptor. Descriptor lengths are
+		 * multiples of 8 bytes so in case of a wrapped
+		 * descriptor the first 8 bytes guaranteed to appear
+		 * before the end of the buffer. We first obtain the
+		 * length, we then copy the rest of the descriptor if
+		 * needed and then extract the rest of the values from
+		 * the descriptor.
+		 *
+		 * Do not change the order of operations as it will
+		 * break the code!!!
+		 */
+		rxd_val1 = le32_to_cpu(rxdd->rxd_val1);
+		tmp_len = TN40_GET_RXD_BC(rxd_val1) << 3;
+		pkt_id = TN40_GET_RXD_PKT_ID(rxd_val1);
+		size -= tmp_len;
+		/* CHECK FOR A PARTIALLY ARRIVED DESCRIPTOR */
+		if (size < 0) {
+			netdev_dbg(priv->ndev,
+				   "%s partially arrived desc tmp_len %d\n",
+				   __func__, tmp_len);
+			break;
+		}
+		/* make sure that the descriptor fully is arrived
+		 * before reading the rest of the descriptor.
+		 */
+		rmb();
+
+		/* A special treatment is given to non-contiguous
+		 * descriptors that start near the end, wraps around
+		 * and continue at the beginning. The second part is
+		 * copied right after the first, and then descriptor
+		 * is interpreted as normal. The fifo has an extra
+		 * space to allow such operations.
+		 */
+
+		/* HAVE WE REACHED THE END OF THE QUEUE? */
+		f->m.rptr += tmp_len;
+		tmp_len = f->m.rptr - f->m.memsz;
+		if (unlikely(tmp_len >= 0)) {
+			f->m.rptr = tmp_len;
+			if (tmp_len > 0) {
+				/* COPY PARTIAL DESCRIPTOR
+				 * TO THE END OF THE QUEUE
+				 */
+				netdev_dbg(priv->ndev,
+					   "wrapped desc rptr=%d tmp_len=%d\n",
+					   f->m.rptr, tmp_len);
+				memcpy(f->m.va + f->m.memsz, f->m.va, tmp_len);
+			}
+		}
+		idx = le32_to_cpu(rxdd->va_lo);
+		dm = tn40_rxdb_addr_elem(db, idx);
+		prefetch(dm);
+
+		len = le16_to_cpu(rxdd->len);
+		rxd_vlan = le16_to_cpu(rxdd->rxd_vlan);
+		/* CHECK FOR ERRORS */
+		rxd_err = TN40_GET_RXD_ERR(rxd_val1);
+		if (unlikely(rxd_err)) {
+			u64_stats_update_begin(&priv->syncp);
+			priv->stats.rx_errors++;
+			u64_stats_update_end(&priv->syncp);
+			tn40_recycle_rx_buffer(priv, rxdd);
+			continue;
+		}
+
+		skb = napi_build_skb(page_address(dm->page), PAGE_SIZE);
+		if (!skb) {
+			u64_stats_update_begin(&priv->syncp);
+			priv->stats.rx_dropped++;
+			u64_stats_update_end(&priv->syncp);
+			tn40_recycle_rx_buffer(priv, rxdd);
+			break;
+		}
+		skb_mark_for_recycle(skb);
+		skb_put(skb, len);
+		skb->protocol = eth_type_trans(skb, priv->ndev);
+		skb->ip_summed =
+		    (pkt_id == 0) ? CHECKSUM_NONE : CHECKSUM_UNNECESSARY;
+		if (TN40_GET_RXD_VTAG(rxd_val1))
+			__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
+					       TN40_GET_RXD_VLAN_TCI(rxd_vlan));
+
+		dm->page = NULL;
+		tn40_rxdb_free_elem(db, idx);
+
+		napi_gro_receive(&priv->napi, skb);
+
+		u64_stats_update_begin(&priv->syncp);
+		priv->stats.rx_bytes += len;
+		u64_stats_update_end(&priv->syncp);
+
+		if (unlikely(++done >= budget))
+			break;
+	}
+	u64_stats_update_begin(&priv->syncp);
+	priv->stats.rx_packets += done;
+	u64_stats_update_end(&priv->syncp);
+	/* FIXME: Do something to minimize pci accesses */
+	tn40_write_reg(priv, f->m.reg_rptr, f->m.rptr & TN40_TXF_WPTR_WR_PTR);
+	tn40_rx_alloc_buffers(priv);
+	return done;
+}
+
+/* TX HW/SW interaction overview
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ * There are 2 types of TX communication channels between driver and NIC.
+ * 1) TX Free Fifo - TXF - Holds ack descriptors for sent packets.
+ * 2) TX Data Fifo - TXD - Holds descriptors of full buffers.
+ *
+ * Currently the NIC supports TSO, checksumming and gather DMA
+ * UFO and IP fragmentation is on the way.
+ *
+ * RX SW Data Structures
+ * ~~~~~~~~~~~~~~~~~~~~~
+ * TXDB is used to keep track of all skbs owned by SW and their DMA addresses.
+ * For TX case, ownership lasts from getting the packet via hard_xmit and
+ * until the HW acknowledges sending the packet by TXF descriptors.
+ * TXDB is implemented as a cyclic buffer.
+ *
+ * FIFO objects keep info about the fifo's size and location, relevant HW
+ * registers, usage and skb db. Each RXD and RXF fifo has their own fifo
+ * structure. Implemented as simple struct.
+ *
+ * TX SW Execution Flow
+ * ~~~~~~~~~~~~~~~~~~~~
+ * OS calls the driver's hard_xmit method with a packet to send. The driver
+ * creates DMA mappings, builds TXD descriptors and kicks the HW by updating
+ * TXD WPTR.
+ *
+ * When a packet is sent, The HW write a TXF descriptor and the SW
+ * frees the original skb. To prevent TXD fifo overflow without
+ * reading HW registers every time, the SW deploys "tx level"
+ * technique. Upon startup, the tx level is initialized to TXD fifo
+ * length. For every sent packet, the SW gets its TXD descriptor size
+ * (from a pre-calculated array) and subtracts it from tx level.  The
+ * size is also stored in txdb. When a TXF ack arrives, the SW fetched
+ * the size of the original TXD descriptor from the txdb and adds it
+ * to the tx level. When the Tx level drops below some predefined
+ * threshold, the driver stops the TX queue. When the TX level rises
+ * above that level, the tx queue is enabled again.
+ *
+ * This technique avoids excessive reading of RPTR and WPTR registers.
+ * As our benchmarks shows, it adds 1.5 Gbit/sec to NIC's throughput.
+ */
+static void tn40_do_tx_db_ptr_next(struct tn40_txdb *db,
+				   struct tn40_tx_map **pptr)
+{
+	++*pptr;
+	if (unlikely(*pptr == db->end))
+		*pptr = db->start;
+}
+
+static void tn40_tx_db_inc_rptr(struct tn40_txdb *db)
+{
+	tn40_do_tx_db_ptr_next(db, &db->rptr);
+}
+
+static void tn40_tx_db_inc_wptr(struct tn40_txdb *db)
+{
+	tn40_do_tx_db_ptr_next(db, &db->wptr);
+}
+
+static int tn40_tx_db_init(struct tn40_txdb *d, int sz_type)
+{
+	int memsz = TN40_FIFO_SIZE * (1 << (sz_type + 1));
+
+	d->start = vzalloc(memsz);
+	if (!d->start)
+		return -ENOMEM;
+	/* In order to differentiate between an empty db state and a full db
+	 * state at least one element should always be empty in order to
+	 * avoid rptr == wptr, which means that the db is empty.
+	 */
+	d->size = memsz / sizeof(struct tn40_tx_map) - 1;
+	d->end = d->start + d->size + 1;	/* just after last element */
+
+	/* All dbs are created empty */
+	d->rptr = d->start;
+	d->wptr = d->start;
+	return 0;
+}
+
+static void tn40_tx_db_close(struct tn40_txdb *d)
+{
+	if (d->start) {
+		vfree(d->start);
+		d->start = NULL;
+	}
+}
+
+/* Sizes of tx desc (including padding if needed) as function of the SKB's
+ * frag number
+ * 7 - is number of lwords in txd with one phys buffer
+ * 3 - is number of lwords used for every additional phys buffer
+ * for (i = 0; i < TN40_MAX_PBL; i++) {
+ *	lwords = 7 + (i * 3);
+ *	if (lwords & 1)
+ *		lwords++;	pad it with 1 lword
+ *	tn40_txd_sizes[i].bytes = lwords << 2;
+ *	tn40_txd_sizes[i].qwords = lwords >> 1;
+ * }
+ */
+static struct {
+	u16 bytes;
+	u16 qwords;	/* qword = 64 bit */
+} tn40_txd_sizes[] = {
+	{0x20, 0x04},
+	{0x28, 0x05},
+	{0x38, 0x07},
+	{0x40, 0x08},
+	{0x50, 0x0a},
+	{0x58, 0x0b},
+	{0x68, 0x0d},
+	{0x70, 0x0e},
+	{0x80, 0x10},
+	{0x88, 0x11},
+	{0x98, 0x13},
+	{0xa0, 0x14},
+	{0xb0, 0x16},
+	{0xb8, 0x17},
+	{0xc8, 0x19},
+	{0xd0, 0x1a},
+	{0xe0, 0x1c},
+	{0xe8, 0x1d},
+	{0xf8, 0x1f},
+};
+
+static void tn40_pbl_set(struct tn40_pbl *pbl, dma_addr_t dma, int len)
+{
+	pbl->len = cpu_to_le32(len);
+	pbl->pa_lo = cpu_to_le32(lower_32_bits(dma));
+	pbl->pa_hi = cpu_to_le32(upper_32_bits(dma));
+}
+
+static void tn40_txdb_set(struct tn40_txdb *db, dma_addr_t dma, int len)
+{
+	db->wptr->len = len;
+	db->wptr->addr.dma = dma;
+}
+
+struct tn40_mapping_info {
+	dma_addr_t dma;
+	size_t size;
+};
+
+/**
+ * tn40_tx_map_skb - create and store DMA mappings for skb's data blocks
+ * @priv: NIC private structure
+ * @skb: socket buffer to map
+ * @txdd: pointer to tx descriptor to be updated
+ * @pkt_len: pointer to unsigned long value
+ *
+ * This function creates DMA mappings for skb's data blocks and writes them to
+ * PBL of a new tx descriptor. It also stores them in the tx db, so they could
+ * be unmapped after the data has been sent. It is the responsibility of the
+ * caller to make sure that there is enough space in the txdb. The last
+ * element holds a pointer to skb itself and is marked with a zero length.
+ *
+ * Return: 0 on success and negative value on error.
+ */
+static int tn40_tx_map_skb(struct tn40_priv *priv, struct sk_buff *skb,
+			   struct tn40_txd_desc *txdd, unsigned int *pkt_len)
+{
+	struct tn40_mapping_info info[TN40_MAX_PBL];
+	int nr_frags = skb_shinfo(skb)->nr_frags;
+	struct tn40_pbl *pbl = &txdd->pbl[0];
+	struct tn40_txdb *db = &priv->txdb;
+	unsigned int size;
+	int i, len, ret;
+	dma_addr_t dma;
+
+	netdev_dbg(priv->ndev, "TX skb %p skbLen %d dataLen %d frags %d\n", skb,
+		   skb->len, skb->data_len, nr_frags);
+	if (nr_frags > TN40_MAX_PBL - 1) {
+		ret = skb_linearize(skb);
+		if (ret)
+			return ret;
+		nr_frags = skb_shinfo(skb)->nr_frags;
+	}
+	/* initial skb */
+	len = skb->len - skb->data_len;
+	dma = dma_map_single(&priv->pdev->dev, skb->data, len,
+			     DMA_TO_DEVICE);
+	ret = dma_mapping_error(&priv->pdev->dev, dma);
+	if (ret)
+		return ret;
+
+	tn40_txdb_set(db, dma, len);
+	tn40_pbl_set(pbl++, db->wptr->addr.dma, db->wptr->len);
+	*pkt_len = db->wptr->len;
+
+	for (i = 0; i < nr_frags; i++) {
+		skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
+
+		size = skb_frag_size(frag);
+		dma = skb_frag_dma_map(&priv->pdev->dev, frag, 0,
+				       size, DMA_TO_DEVICE);
+
+		ret = dma_mapping_error(&priv->pdev->dev, dma);
+		if (ret)
+			goto mapping_error;
+		info[i].dma = dma;
+		info[i].size = size;
+	}
+
+	for (i = 0; i < nr_frags; i++) {
+		tn40_tx_db_inc_wptr(db);
+		tn40_txdb_set(db, info[i].dma, info[i].size);
+		tn40_pbl_set(pbl++, db->wptr->addr.dma, db->wptr->len);
+		*pkt_len += db->wptr->len;
+	}
+
+	/* SHORT_PKT_FIX */
+	if (skb->len < TN40_SHORT_PACKET_SIZE)
+		++nr_frags;
+
+	/* Add skb clean up info. */
+	tn40_tx_db_inc_wptr(db);
+	db->wptr->len = -tn40_txd_sizes[nr_frags].bytes;
+	db->wptr->addr.skb = skb;
+	tn40_tx_db_inc_wptr(db);
+
+	return 0;
+ mapping_error:
+	dma_unmap_page(&priv->pdev->dev, db->wptr->addr.dma, db->wptr->len,
+		       DMA_TO_DEVICE);
+	for (; i > 0; i--)
+		dma_unmap_page(&priv->pdev->dev, info[i - 1].dma,
+			       info[i - 1].size, DMA_TO_DEVICE);
+	return -ENOMEM;
+}
+
+static int tn40_create_tx_ring(struct tn40_priv *priv)
+{
+	int ret;
+
+	ret = tn40_fifo_alloc(priv, &priv->txd_fifo0.m, priv->txd_size,
+			      TN40_REG_TXD_CFG0_0, TN40_REG_TXD_CFG1_0,
+			      TN40_REG_TXD_RPTR_0, TN40_REG_TXD_WPTR_0);
+	if (ret)
+		return ret;
+
+	ret = tn40_fifo_alloc(priv, &priv->txf_fifo0.m, priv->txf_size,
+			      TN40_REG_TXF_CFG0_0, TN40_REG_TXF_CFG1_0,
+			      TN40_REG_TXF_RPTR_0, TN40_REG_TXF_WPTR_0);
+	if (ret)
+		goto err_free_txd;
+
+	/* The TX db has to keep mappings for all packets sent (on
+	 * TxD) and not yet reclaimed (on TxF).
+	 */
+	ret = tn40_tx_db_init(&priv->txdb, max(priv->txd_size, priv->txf_size));
+	if (ret)
+		goto err_free_txf;
+
+	/* SHORT_PKT_FIX */
+	priv->b0_len = 64;
+	priv->b0_va = dma_alloc_coherent(&priv->pdev->dev, priv->b0_len,
+					 &priv->b0_dma, GFP_KERNEL);
+	if (!priv->b0_va)
+		goto err_free_db;
+
+	priv->tx_level = TN40_MAX_TX_LEVEL;
+	priv->tx_update_mark = priv->tx_level - 1024;
+	return 0;
+err_free_db:
+	tn40_tx_db_close(&priv->txdb);
+err_free_txf:
+	tn40_fifo_free(priv, &priv->txf_fifo0.m);
+err_free_txd:
+	tn40_fifo_free(priv, &priv->txd_fifo0.m);
+	return -ENOMEM;
+}
+
+/**
+ * tn40_tx_space - Calculate the available space in the TX fifo.
+ * @priv: NIC private structure
+ *
+ * Return: available space in TX fifo in bytes
+ */
+static int tn40_tx_space(struct tn40_priv *priv)
+{
+	struct tn40_txd_fifo *f = &priv->txd_fifo0;
+	int fsize;
+
+	f->m.rptr = tn40_read_reg(priv, f->m.reg_rptr) & TN40_TXF_WPTR_WR_PTR;
+	fsize = f->m.rptr - f->m.wptr;
+	if (fsize <= 0)
+		fsize = f->m.memsz + fsize;
+	return fsize;
+}
+
+#define TN40_TXD_FULL_CHECKSUM 7
+
+static netdev_tx_t tn40_start_xmit(struct sk_buff *skb, struct net_device *ndev)
+{
+	struct tn40_priv *priv = netdev_priv(ndev);
+	struct tn40_txd_fifo *f = &priv->txd_fifo0;
+	int txd_checksum = TN40_TXD_FULL_CHECKSUM;
+	struct tn40_txd_desc *txdd;
+	int nr_frags, len, err;
+	unsigned int pkt_len;
+	int txd_vlan_id = 0;
+	int txd_lgsnd = 0;
+	int txd_vtag = 0;
+	int txd_mss = 0;
+
+	/* Build tx descriptor */
+	txdd = (struct tn40_txd_desc *)(f->m.va + f->m.wptr);
+	err = tn40_tx_map_skb(priv, skb, txdd, &pkt_len);
+	if (err) {
+		u64_stats_update_begin(&priv->syncp);
+		priv->stats.tx_dropped++;
+		u64_stats_update_end(&priv->syncp);
+		dev_kfree_skb(skb);
+		return NETDEV_TX_OK;
+	}
+	nr_frags = skb_shinfo(skb)->nr_frags;
+	if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL))
+		txd_checksum = 0;
+
+	if (skb_shinfo(skb)->gso_size) {
+		txd_mss = skb_shinfo(skb)->gso_size;
+		txd_lgsnd = 1;
+		netdev_dbg(priv->ndev, "skb %p pkt len %d gso size = %d\n", skb,
+			   pkt_len, txd_mss);
+	}
+	if (skb_vlan_tag_present(skb)) {
+		/* Don't cut VLAN ID to 12 bits */
+		txd_vlan_id = skb_vlan_tag_get(skb);
+		txd_vtag = 1;
+	}
+	txdd->va_hi = 0;
+	txdd->va_lo = 0;
+	txdd->length = cpu_to_le16(pkt_len);
+	txdd->mss = cpu_to_le16(txd_mss);
+	txdd->txd_val1 =
+		cpu_to_le32(TN40_TXD_W1_VAL
+			    (tn40_txd_sizes[nr_frags].qwords, txd_checksum,
+			     txd_vtag, txd_lgsnd, txd_vlan_id));
+	netdev_dbg(priv->ndev, "=== w1 qwords[%d] %d =====\n", nr_frags,
+		   tn40_txd_sizes[nr_frags].qwords);
+	netdev_dbg(priv->ndev, "=== TxD desc =====================\n");
+	netdev_dbg(priv->ndev, "=== w1: 0x%x ================\n",
+		   txdd->txd_val1);
+	netdev_dbg(priv->ndev, "=== w2: mss 0x%x len 0x%x\n", txdd->mss,
+		   txdd->length);
+	/* SHORT_PKT_FIX */
+	if (pkt_len < TN40_SHORT_PACKET_SIZE) {
+		struct tn40_pbl *pbl = &txdd->pbl[++nr_frags];
+
+		txdd->length = cpu_to_le16(TN40_SHORT_PACKET_SIZE);
+		txdd->txd_val1 =
+			cpu_to_le32(TN40_TXD_W1_VAL
+				    (tn40_txd_sizes[nr_frags].qwords,
+				     txd_checksum, txd_vtag, txd_lgsnd,
+				     txd_vlan_id));
+		pbl->len = cpu_to_le32(TN40_SHORT_PACKET_SIZE - pkt_len);
+		pbl->pa_lo = cpu_to_le32(lower_32_bits(priv->b0_dma));
+		pbl->pa_hi = cpu_to_le32(upper_32_bits(priv->b0_dma));
+		netdev_dbg(priv->ndev, "=== SHORT_PKT_FIX   ==============\n");
+		netdev_dbg(priv->ndev, "=== nr_frags : %d   ==============\n",
+			   nr_frags);
+	}
+
+	/* Increment TXD write pointer. In case of fifo wrapping copy
+	 * reminder of the descriptor to the beginning.
+	 */
+	f->m.wptr += tn40_txd_sizes[nr_frags].bytes;
+	len = f->m.wptr - f->m.memsz;
+	if (unlikely(len >= 0)) {
+		f->m.wptr = len;
+		if (len > 0)
+			memcpy(f->m.va, f->m.va + f->m.memsz, len);
+	}
+	/* Force memory writes to complete before letting the HW know
+	 * there are new descriptors to fetch.
+	 */
+	wmb();
+
+	priv->tx_level -= tn40_txd_sizes[nr_frags].bytes;
+	if (priv->tx_level > priv->tx_update_mark) {
+		tn40_write_reg(priv, f->m.reg_wptr,
+			       f->m.wptr & TN40_TXF_WPTR_WR_PTR);
+	} else {
+		if (priv->tx_noupd++ > TN40_NO_UPD_PACKETS) {
+			priv->tx_noupd = 0;
+			tn40_write_reg(priv, f->m.reg_wptr,
+				       f->m.wptr & TN40_TXF_WPTR_WR_PTR);
+		}
+	}
+
+	u64_stats_update_begin(&priv->syncp);
+	priv->stats.tx_packets++;
+	priv->stats.tx_bytes += pkt_len;
+	u64_stats_update_end(&priv->syncp);
+	if (priv->tx_level < TN40_MIN_TX_LEVEL) {
+		netdev_dbg(priv->ndev, "TX Q STOP level %d\n", priv->tx_level);
+		netif_stop_queue(ndev);
+	}
+
+	return NETDEV_TX_OK;
+}
+
+static void tn40_tx_cleanup(struct tn40_priv *priv)
+{
+	struct tn40_txf_fifo *f = &priv->txf_fifo0;
+	struct tn40_txdb *db = &priv->txdb;
+	int tx_level = 0;
+
+	f->m.wptr = tn40_read_reg(priv, f->m.reg_wptr) & TN40_TXF_WPTR_MASK;
+
+	netif_tx_lock(priv->ndev);
+	while (f->m.wptr != f->m.rptr) {
+		f->m.rptr += TN40_TXF_DESC_SZ;
+		f->m.rptr &= f->m.size_mask;
+		/* Unmap all fragments */
+		/* First has to come tx_maps containing DMA */
+		do {
+			dma_addr_t addr = db->rptr->addr.dma;
+			size_t size =  db->rptr->len;
+
+			netif_tx_unlock(priv->ndev);
+			dma_unmap_page(&priv->pdev->dev, addr,
+				       size, DMA_TO_DEVICE);
+			netif_tx_lock(priv->ndev);
+			tn40_tx_db_inc_rptr(db);
+		} while (db->rptr->len > 0);
+		tx_level -= db->rptr->len; /* '-' Because the len is negative */
+
+		/* Now should come skb pointer - free it */
+		dev_kfree_skb_any(db->rptr->addr.skb);
+		netdev_dbg(priv->ndev, "dev_kfree_skb_any %p %d\n",
+			   db->rptr->addr.skb, -db->rptr->len);
+		tn40_tx_db_inc_rptr(db);
+	}
+
+	/* Let the HW know which TXF descriptors were cleaned */
+	tn40_write_reg(priv, f->m.reg_rptr, f->m.rptr & TN40_TXF_WPTR_WR_PTR);
+
+	/* We reclaimed resources, so in case the Q is stopped by xmit
+	 * callback, we resume the transmission and use tx_lock to
+	 * synchronize with xmit.
+	 */
+	priv->tx_level += tx_level;
+	if (priv->tx_noupd) {
+		priv->tx_noupd = 0;
+		tn40_write_reg(priv, priv->txd_fifo0.m.reg_wptr,
+			       priv->txd_fifo0.m.wptr & TN40_TXF_WPTR_WR_PTR);
+	}
+	if (unlikely(netif_queue_stopped(priv->ndev) &&
+		     netif_carrier_ok(priv->ndev) &&
+		     (priv->tx_level >= TN40_MAX_TX_LEVEL / 2))) {
+		netdev_dbg(priv->ndev, "TX Q WAKE level %d\n", priv->tx_level);
+		netif_wake_queue(priv->ndev);
+	}
+	netif_tx_unlock(priv->ndev);
+}
+
+static void tn40_tx_free_skbs(struct tn40_priv *priv)
+{
+	struct tn40_txdb *db = &priv->txdb;
+
+	while (db->rptr != db->wptr) {
+		if (likely(db->rptr->len))
+			dma_unmap_page(&priv->pdev->dev, db->rptr->addr.dma,
+				       db->rptr->len, DMA_TO_DEVICE);
+		else
+			dev_kfree_skb(db->rptr->addr.skb);
+		tn40_tx_db_inc_rptr(db);
+	}
+}
+
+static void tn40_destroy_tx_ring(struct tn40_priv *priv)
+{
+	tn40_tx_free_skbs(priv);
+	tn40_fifo_free(priv, &priv->txd_fifo0.m);
+	tn40_fifo_free(priv, &priv->txf_fifo0.m);
+	tn40_tx_db_close(&priv->txdb);
+	/* SHORT_PKT_FIX */
+	if (priv->b0_len) {
+		dma_free_coherent(&priv->pdev->dev, priv->b0_len, priv->b0_va,
+				  priv->b0_dma);
+		priv->b0_len = 0;
+	}
+}
+
+/**
+ * tn40_tx_push_desc - Push a descriptor to TxD fifo.
+ *
+ * @priv: NIC private structure
+ * @data: desc's data
+ * @size: desc's size
+ *
+ * This function pushes desc to TxD fifo and overlaps it if needed.
+ *
+ * This function does not check for available space, nor does it check
+ * that the data size is smaller than the fifo size. Checking for
+ * space is the responsibility of the caller.
+ */
+static void tn40_tx_push_desc(struct tn40_priv *priv, void *data, int size)
+{
+	struct tn40_txd_fifo *f = &priv->txd_fifo0;
+	int i = f->m.memsz - f->m.wptr;
+
+	if (size == 0)
+		return;
+
+	if (i > size) {
+		memcpy(f->m.va + f->m.wptr, data, size);
+		f->m.wptr += size;
+	} else {
+		memcpy(f->m.va + f->m.wptr, data, i);
+		f->m.wptr = size - i;
+		memcpy(f->m.va, data + i, f->m.wptr);
+	}
+	tn40_write_reg(priv, f->m.reg_wptr, f->m.wptr & TN40_TXF_WPTR_WR_PTR);
+}
+
+/**
+ * tn40_tx_push_desc_safe - push descriptor to TxD fifo in a safe way.
+ *
+ * @priv: NIC private structure
+ * @data: descriptor data
+ * @size: descriptor size
+ *
+ * This function does check for available space and, if necessary,
+ * waits for the NIC to read existing data before writing new data.
+ */
+static void tn40_tx_push_desc_safe(struct tn40_priv *priv, void *data, int size)
+{
+	int timer = 0;
+
+	while (size > 0) {
+		/* We subtract 8 because when the fifo is full rptr ==
+		 * wptr, which also means that fifo is empty, we can
+		 * understand the difference, but could the HW do the
+		 * same ???
+		 */
+		int avail = tn40_tx_space(priv) - 8;
+
+		if (avail <= 0) {
+			if (timer++ > 300) /* Prevent endless loop */
+				break;
+			/* Give the HW a chance to clean the fifo */
+			usleep_range(50, 60);
+			continue;
+		}
+		avail = min(avail, size);
+		netdev_dbg(priv->ndev,
+			   "about to push  %d bytes starting %p size %d\n",
+			   avail, data, size);
+		tn40_tx_push_desc(priv, data, avail);
+		size -= avail;
+		data += avail;
+	}
+}
+
+int tn40_set_link_speed(struct tn40_priv *priv, u32 speed)
+{
+	u32 val;
+	int i;
+
+	netdev_dbg(priv->ndev, "speed %d\n", speed);
+	switch (speed) {
+	case SPEED_10000:
+	case SPEED_5000:
+	case SPEED_2500:
+		netdev_dbg(priv->ndev, "link_speed %d\n", speed);
+
+		tn40_write_reg(priv, 0x1010, 0x217);	/*ETHSD.REFCLK_CONF  */
+		tn40_write_reg(priv, 0x104c, 0x4c);	/*ETHSD.L0_RX_PCNT  */
+		tn40_write_reg(priv, 0x1050, 0x4c);	/*ETHSD.L1_RX_PCNT  */
+		tn40_write_reg(priv, 0x1054, 0x4c);	/*ETHSD.L2_RX_PCNT  */
+		tn40_write_reg(priv, 0x1058, 0x4c);	/*ETHSD.L3_RX_PCNT  */
+		tn40_write_reg(priv, 0x102c, 0x434);	/*ETHSD.L0_TX_PCNT  */
+		tn40_write_reg(priv, 0x1030, 0x434);	/*ETHSD.L1_TX_PCNT  */
+		tn40_write_reg(priv, 0x1034, 0x434);	/*ETHSD.L2_TX_PCNT  */
+		tn40_write_reg(priv, 0x1038, 0x434);	/*ETHSD.L3_TX_PCNT  */
+		tn40_write_reg(priv, 0x6300, 0x0400);	/*MAC.PCS_CTRL */
+
+		tn40_write_reg(priv, 0x1018, 0x00);	/*Mike2 */
+		udelay(5);
+		tn40_write_reg(priv, 0x1018, 0x04);	/*Mike2 */
+		udelay(5);
+		tn40_write_reg(priv, 0x1018, 0x06);	/*Mike2 */
+		udelay(5);
+		/*MikeFix1 */
+		/*L0: 0x103c , L1: 0x1040 , L2: 0x1044 , L3: 0x1048 =0x81644 */
+		tn40_write_reg(priv, 0x103c, 0x81644);	/*ETHSD.L0_TX_DCNT  */
+		tn40_write_reg(priv, 0x1040, 0x81644);	/*ETHSD.L1_TX_DCNT  */
+		tn40_write_reg(priv, 0x1044, 0x81644);	/*ETHSD.L2_TX_DCNT  */
+		tn40_write_reg(priv, 0x1048, 0x81644);	/*ETHSD.L3_TX_DCNT  */
+		tn40_write_reg(priv, 0x1014, 0x043);	/*ETHSD.INIT_STAT */
+		for (i = 1000; i; i--) {
+			usleep_range(50, 60);
+			/*ETHSD.INIT_STAT */
+			val = tn40_read_reg(priv, 0x1014);
+			if (val & (1 << 9)) {
+				/*ETHSD.INIT_STAT */
+				tn40_write_reg(priv, 0x1014, 0x3);
+				/*ETHSD.INIT_STAT */
+				val = tn40_read_reg(priv, 0x1014);
+
+				break;
+			}
+		}
+		if (!i)
+			netdev_err(priv->ndev, "MAC init timeout!\n");
+
+		tn40_write_reg(priv, 0x6350, 0x0);	/*MAC.PCS_IF_MODE */
+		tn40_write_reg(priv, TN40_REG_CTRLST, 0xC13);	/*0x93//0x13 */
+		tn40_write_reg(priv, 0x111c, 0x7ff);	/*MAC.MAC_RST_CNT */
+		usleep_range(2000, 2100);
+
+		tn40_write_reg(priv, 0x111c, 0x0);	/*MAC.MAC_RST_CNT */
+		break;
+
+	case SPEED_1000:
+	case SPEED_100:
+		tn40_write_reg(priv, 0x1010, 0x613);	/*ETHSD.REFCLK_CONF */
+		tn40_write_reg(priv, 0x104c, 0x4d);	/*ETHSD.L0_RX_PCNT  */
+		tn40_write_reg(priv, 0x1050, 0x0);	/*ETHSD.L1_RX_PCNT  */
+		tn40_write_reg(priv, 0x1054, 0x0);	/*ETHSD.L2_RX_PCNT  */
+		tn40_write_reg(priv, 0x1058, 0x0);	/*ETHSD.L3_RX_PCNT  */
+		tn40_write_reg(priv, 0x102c, 0x35);	/*ETHSD.L0_TX_PCNT  */
+		tn40_write_reg(priv, 0x1030, 0x0);	/*ETHSD.L1_TX_PCNT  */
+		tn40_write_reg(priv, 0x1034, 0x0);	/*ETHSD.L2_TX_PCNT  */
+		tn40_write_reg(priv, 0x1038, 0x0);	/*ETHSD.L3_TX_PCNT  */
+		tn40_write_reg(priv, 0x6300, 0x01140);	/*MAC.PCS_CTRL */
+
+		tn40_write_reg(priv, 0x1014, 0x043);	/*ETHSD.INIT_STAT */
+		for (i = 1000; i; i--) {
+			usleep_range(50, 60);
+			val = tn40_read_reg(priv, 0x1014); /*ETHSD.INIT_STAT */
+			if (val & (1 << 9)) {
+				/*ETHSD.INIT_STAT */
+				tn40_write_reg(priv, 0x1014, 0x3);
+				/*ETHSD.INIT_STAT */
+				val = tn40_read_reg(priv, 0x1014);
+
+				break;
+			}
+		}
+		if (!i)
+			netdev_err(priv->ndev, "MAC init timeout!\n");
+
+		tn40_write_reg(priv, 0x6350, 0x2b);	/*MAC.PCS_IF_MODE 1g */
+		tn40_write_reg(priv, 0x6310, 0x9801);	/*MAC.PCS_DEV_AB */
+
+		tn40_write_reg(priv, 0x6314, 0x1);	/*MAC.PCS_PART_AB */
+		tn40_write_reg(priv, 0x6348, 0xc8);	/*MAC.PCS_LINK_LO */
+		tn40_write_reg(priv, 0x634c, 0xc8);	/*MAC.PCS_LINK_HI */
+		usleep_range(50, 60);
+		tn40_write_reg(priv, TN40_REG_CTRLST, 0xC13);	/*0x93//0x13 */
+		tn40_write_reg(priv, 0x111c, 0x7ff);	/*MAC.MAC_RST_CNT */
+		usleep_range(2000, 2100);
+
+		tn40_write_reg(priv, 0x111c, 0x0);	/*MAC.MAC_RST_CNT */
+		tn40_write_reg(priv, 0x6300, 0x1140);	/*MAC.PCS_CTRL */
+		break;
+
+	case 0:		/* Link down */
+		tn40_write_reg(priv, 0x104c, 0x0);	/*ETHSD.L0_RX_PCNT  */
+		tn40_write_reg(priv, 0x1050, 0x0);	/*ETHSD.L1_RX_PCNT  */
+		tn40_write_reg(priv, 0x1054, 0x0);	/*ETHSD.L2_RX_PCNT  */
+		tn40_write_reg(priv, 0x1058, 0x0);	/*ETHSD.L3_RX_PCNT  */
+		tn40_write_reg(priv, 0x102c, 0x0);	/*ETHSD.L0_TX_PCNT  */
+		tn40_write_reg(priv, 0x1030, 0x0);	/*ETHSD.L1_TX_PCNT  */
+		tn40_write_reg(priv, 0x1034, 0x0);	/*ETHSD.L2_TX_PCNT  */
+		tn40_write_reg(priv, 0x1038, 0x0);	/*ETHSD.L3_TX_PCNT  */
+
+		tn40_write_reg(priv, TN40_REG_CTRLST, 0x800);
+		tn40_write_reg(priv, 0x111c, 0x7ff);	/*MAC.MAC_RST_CNT */
+		usleep_range(2000, 2100);
+
+		tn40_write_reg(priv, 0x111c, 0x0);	/*MAC.MAC_RST_CNT */
+		break;
+
+	default:
+		netdev_err(priv->ndev,
+			   "Link speed was not identified yet (%d)\n", speed);
+		speed = 0;
+		break;
+	}
+	return speed;
+}
+
+static void tn40_link_changed(struct tn40_priv *priv)
+{
+	u32 link = tn40_read_reg(priv,
+				 TN40_REG_MAC_LNK_STAT) & TN40_MAC_LINK_STAT;
+
+	netdev_dbg(priv->ndev, "link changed %u\n", link);
+}
+
+static void tn40_isr_extra(struct tn40_priv *priv, u32 isr)
+{
+	if (isr & (TN40_IR_LNKCHG0 | TN40_IR_LNKCHG1 | TN40_IR_TMR0)) {
+		netdev_dbg(priv->ndev, "isr = 0x%x\n", isr);
+		tn40_link_changed(priv);
+	}
+}
+
+static irqreturn_t tn40_isr_napi(int irq, void *dev)
+{
+	struct tn40_priv *priv = netdev_priv((struct net_device *)dev);
+	u32 isr;
+
+	isr = tn40_read_reg(priv, TN40_REG_ISR_MSK0);
+
+	if (unlikely(!isr)) {
+		tn40_enable_interrupts(priv);
+		return IRQ_NONE;	/* Not our interrupt */
+	}
+
+	if (isr & TN40_IR_EXTRA)
+		tn40_isr_extra(priv, isr);
+
+	if (isr & (TN40_IR_RX_DESC_0 | TN40_IR_TX_FREE_0 | TN40_IR_TMR1)) {
+		if (likely(napi_schedule_prep(&priv->napi))) {
+			__napi_schedule(&priv->napi);
+			return IRQ_HANDLED;
+		}
+		/* We get here if an interrupt has slept into the
+		 * small time window between these lines in
+		 * tn40_poll: tn40_enable_interrupts(priv); return 0;
+		 *
+		 * Currently interrupts are disabled (since we read
+		 * the ISR register) and we have failed to register
+		 * the next poll. So we read the regs to trigger the
+		 * chip and allow further interrupts.
+		 */
+		tn40_read_reg(priv, TN40_REG_TXF_WPTR_0);
+		tn40_read_reg(priv, TN40_REG_RXD_WPTR_0);
+	}
+
+	tn40_enable_interrupts(priv);
+	return IRQ_HANDLED;
+}
+
+static int tn40_poll(struct napi_struct *napi, int budget)
+{
+	struct tn40_priv *priv = container_of(napi, struct tn40_priv, napi);
+	int work_done;
+
+	tn40_tx_cleanup(priv);
+
+	if (!budget)
+		return 0;
+
+	work_done = tn40_rx_receive(priv, budget);
+	if (work_done == budget)
+		return budget;
+
+	if (napi_complete_done(napi, work_done))
+		tn40_enable_interrupts(priv);
+	return work_done;
+}
+
+static int tn40_fw_load(struct tn40_priv *priv)
+{
+	const struct firmware *fw = NULL;
+	int master, ret;
+	u32 val;
+
+	ret = request_firmware(&fw, TN40_FIRMWARE_NAME, &priv->pdev->dev);
+	if (ret)
+		return ret;
+
+	master = tn40_read_reg(priv, TN40_REG_INIT_SEMAPHORE);
+	if (!tn40_read_reg(priv, TN40_REG_INIT_STATUS) && master) {
+		netdev_dbg(priv->ndev, "Loading FW...\n");
+		tn40_tx_push_desc_safe(priv, (void *)fw->data, fw->size);
+		msleep(100);
+	}
+	ret = read_poll_timeout(tn40_read_reg, val, val, 2000, 400000, false,
+				priv, TN40_REG_INIT_STATUS);
+	if (master)
+		tn40_write_reg(priv, TN40_REG_INIT_SEMAPHORE, 1);
+
+	if (ret) {
+		netdev_err(priv->ndev, "firmware loading failed\n");
+		netdev_dbg(priv->ndev, "VPC: 0x%x VIC: 0x%x STATUS: 0x%xd\n",
+			   tn40_read_reg(priv, TN40_REG_VPC),
+			   tn40_read_reg(priv, TN40_REG_VIC),
+			   tn40_read_reg(priv, TN40_REG_INIT_STATUS));
+		ret = -EIO;
+	} else {
+		netdev_dbg(priv->ndev, "firmware loading success\n");
+	}
+	release_firmware(fw);
+	return ret;
+}
+
+static void tn40_restore_mac(struct net_device *ndev, struct tn40_priv *priv)
+{
+	u32 val;
+
+	netdev_dbg(priv->ndev, "mac0 =%x mac1 =%x mac2 =%x\n",
+		   tn40_read_reg(priv, TN40_REG_UNC_MAC0_A),
+		   tn40_read_reg(priv, TN40_REG_UNC_MAC1_A),
+		   tn40_read_reg(priv, TN40_REG_UNC_MAC2_A));
+
+	val = (ndev->dev_addr[0] << 8) | (ndev->dev_addr[1]);
+	tn40_write_reg(priv, TN40_REG_UNC_MAC2_A, val);
+	val = (ndev->dev_addr[2] << 8) | (ndev->dev_addr[3]);
+	tn40_write_reg(priv, TN40_REG_UNC_MAC1_A, val);
+	val = (ndev->dev_addr[4] << 8) | (ndev->dev_addr[5]);
+	tn40_write_reg(priv, TN40_REG_UNC_MAC0_A, val);
+
+	/* More then IP MAC address */
+	tn40_write_reg(priv, TN40_REG_MAC_ADDR_0,
+		       (ndev->dev_addr[3] << 24) | (ndev->dev_addr[2] << 16) |
+		       (ndev->dev_addr[1] << 8) | (ndev->dev_addr[0]));
+	tn40_write_reg(priv, TN40_REG_MAC_ADDR_1,
+		       (ndev->dev_addr[5] << 8) | (ndev->dev_addr[4]));
+
+	netdev_dbg(priv->ndev, "mac0 =%x mac1 =%x mac2 =%x\n",
+		   tn40_read_reg(priv, TN40_REG_UNC_MAC0_A),
+		   tn40_read_reg(priv, TN40_REG_UNC_MAC1_A),
+		   tn40_read_reg(priv, TN40_REG_UNC_MAC2_A));
+}
+
+static void tn40_hw_start(struct tn40_priv *priv)
+{
+	tn40_write_reg(priv, TN40_REG_FRM_LENGTH, 0X3FE0);
+	tn40_write_reg(priv, TN40_REG_GMAC_RXF_A, 0X10fd);
+	/*MikeFix1 */
+	/*L0: 0x103c , L1: 0x1040 , L2: 0x1044 , L3: 0x1048 =0x81644 */
+	tn40_write_reg(priv, 0x103c, 0x81644);	/*ETHSD.L0_TX_DCNT  */
+	tn40_write_reg(priv, 0x1040, 0x81644);	/*ETHSD.L1_TX_DCNT  */
+	tn40_write_reg(priv, 0x1044, 0x81644);	/*ETHSD.L2_TX_DCNT  */
+	tn40_write_reg(priv, 0x1048, 0x81644);	/*ETHSD.L3_TX_DCNT  */
+	tn40_write_reg(priv, TN40_REG_RX_FIFO_SECTION, 0x10);
+	tn40_write_reg(priv, TN40_REG_TX_FIFO_SECTION, 0xE00010);
+	tn40_write_reg(priv, TN40_REG_RX_FULLNESS, 0);
+	tn40_write_reg(priv, TN40_REG_TX_FULLNESS, 0);
+
+	tn40_write_reg(priv, TN40_REG_VGLB, 0);
+	tn40_write_reg(priv, TN40_REG_MAX_FRAME_A,
+		       priv->rxf_fifo0.m.pktsz & TN40_MAX_FRAME_AB_VAL);
+	tn40_write_reg(priv, TN40_REG_RDINTCM0, priv->rdintcm);
+	tn40_write_reg(priv, TN40_REG_RDINTCM2, 0);
+
+	/* old val = 0x300064 */
+	tn40_write_reg(priv, TN40_REG_TDINTCM0, priv->tdintcm);
+
+	/* Enable timer interrupt once in 2 secs. */
+	tn40_restore_mac(priv->ndev, priv);
+
+	/* Pause frame */
+	tn40_write_reg(priv, 0x12E0, 0x28);
+	tn40_write_reg(priv, TN40_REG_PAUSE_QUANT, 0xFFFF);
+	tn40_write_reg(priv, 0x6064, 0xF);
+
+	tn40_write_reg(priv, TN40_REG_GMAC_RXF_A,
+		       TN40_GMAC_RX_FILTER_OSEN | TN40_GMAC_RX_FILTER_TXFC |
+		       TN40_GMAC_RX_FILTER_AM | TN40_GMAC_RX_FILTER_AB);
+
+	tn40_enable_interrupts(priv);
+}
+
+static int tn40_hw_reset(struct tn40_priv *priv)
+{
+	u32 val;
+
+	/* Reset sequences: read, write 1, read, write 0 */
+	val = tn40_read_reg(priv, TN40_REG_CLKPLL);
+	tn40_write_reg(priv, TN40_REG_CLKPLL, (val | TN40_CLKPLL_SFTRST) + 0x8);
+	usleep_range(50, 60);
+	val = tn40_read_reg(priv, TN40_REG_CLKPLL);
+	tn40_write_reg(priv, TN40_REG_CLKPLL, val & ~TN40_CLKPLL_SFTRST);
+
+	/* Check that the PLLs are locked and reset ended */
+	val = read_poll_timeout(tn40_read_reg, val,
+				(val & TN40_CLKPLL_LKD) == TN40_CLKPLL_LKD,
+				10000, 700000, false, priv, TN40_REG_CLKPLL);
+	if (val)
+		return -EIO;
+
+	usleep_range(50, 60);
+	/* Do any PCI-E read transaction */
+	tn40_read_reg(priv, TN40_REG_RXD_CFG0_0);
+	return 0;
+}
+
+static void tn40_sw_reset(struct tn40_priv *priv)
+{
+	int i, ret;
+	u32 val;
+
+	/* 1. load MAC (obsolete) */
+	/* 2. disable Rx (and Tx) */
+	tn40_write_reg(priv, TN40_REG_GMAC_RXF_A, 0);
+	msleep(100);
+	/* 3. Disable port */
+	tn40_write_reg(priv, TN40_REG_DIS_PORT, 1);
+	/* 4. Disable queue */
+	tn40_write_reg(priv, TN40_REG_DIS_QU, 1);
+	/* 5. Wait until hw is disabled */
+	ret = read_poll_timeout(tn40_read_reg, val, val & 1, 10000, 500000,
+				false, priv, TN40_REG_RST_PORT);
+	if (ret)
+		netdev_err(priv->ndev, "SW reset timeout. continuing anyway\n");
+
+	/* 6. Disable interrupts */
+	tn40_write_reg(priv, TN40_REG_RDINTCM0, 0);
+	tn40_write_reg(priv, TN40_REG_TDINTCM0, 0);
+	tn40_write_reg(priv, TN40_REG_IMR, 0);
+	tn40_read_reg(priv, TN40_REG_ISR);
+
+	/* 7. Reset queue */
+	tn40_write_reg(priv, TN40_REG_RST_QU, 1);
+	/* 8. Reset port */
+	tn40_write_reg(priv, TN40_REG_RST_PORT, 1);
+	/* 9. Zero all read and write pointers */
+	for (i = TN40_REG_TXD_WPTR_0; i <= TN40_REG_TXF_RPTR_3; i += 0x10)
+		tn40_write_reg(priv, i, 0);
+	/* 10. Unset port disable */
+	tn40_write_reg(priv, TN40_REG_DIS_PORT, 0);
+	/* 11. Unset queue disable */
+	tn40_write_reg(priv, TN40_REG_DIS_QU, 0);
+	/* 12. Unset queue reset */
+	tn40_write_reg(priv, TN40_REG_RST_QU, 0);
+	/* 13. Unset port reset */
+	tn40_write_reg(priv, TN40_REG_RST_PORT, 0);
+	/* 14. Enable Rx */
+	/* Skipped. will be done later */
+}
+
+static int tn40_start(struct tn40_priv *priv)
+{
+	int ret;
+
+	ret = tn40_create_tx_ring(priv);
+	if (ret) {
+		netdev_err(priv->ndev, "failed to tx init %d\n", ret);
+		return ret;
+	}
+
+	ret = tn40_create_rx_ring(priv);
+	if (ret) {
+		netdev_err(priv->ndev, "failed to rx init %d\n", ret);
+		goto err_tx_ring;
+	}
+
+	tn40_rx_alloc_buffers(priv);
+	if (tn40_rxdb_available(priv->rxdb0) != 1) {
+		ret = -ENOMEM;
+		netdev_err(priv->ndev, "failed to allocate rx buffers\n");
+		goto err_rx_ring;
+	}
+
+	ret = request_irq(priv->pdev->irq, &tn40_isr_napi, IRQF_SHARED,
+			  priv->ndev->name, priv->ndev);
+	if (ret) {
+		netdev_err(priv->ndev, "failed to request irq %d\n", ret);
+		goto err_rx_ring;
+	}
+
+	tn40_hw_start(priv);
+	return 0;
+err_rx_ring:
+	tn40_destroy_rx_ring(priv);
+err_tx_ring:
+	tn40_destroy_tx_ring(priv);
+	return ret;
+}
+
+static void tn40_stop(struct tn40_priv *priv)
+{
+	tn40_disable_interrupts(priv);
+	free_irq(priv->pdev->irq, priv->ndev);
+	tn40_sw_reset(priv);
+	tn40_destroy_tx_ring(priv);
+	tn40_destroy_rx_ring(priv);
+}
+
+static int tn40_close(struct net_device *ndev)
+{
+	struct tn40_priv *priv = netdev_priv(ndev);
+
+	phylink_stop(priv->phylink);
+	phylink_disconnect_phy(priv->phylink);
+
+	napi_disable(&priv->napi);
+	netif_napi_del(&priv->napi);
+	tn40_stop(priv);
+	return 0;
+}
+
+static int tn40_open(struct net_device *dev)
+{
+	struct tn40_priv *priv = netdev_priv(dev);
+	int ret;
+
+	ret = phylink_connect_phy(priv->phylink, priv->phydev);
+	if (ret) {
+		netdev_err(dev, "failed to connect to phy %d\n", ret);
+		return ret;
+	}
+	tn40_sw_reset(priv);
+	ret = tn40_start(priv);
+	if (ret) {
+		phylink_disconnect_phy(priv->phylink);
+		netdev_err(dev, "failed to start %d\n", ret);
+		return ret;
+	}
+	napi_enable(&priv->napi);
+	phylink_start(priv->phylink);
+	netif_start_queue(priv->ndev);
+	return 0;
+}
+
+static void __tn40_vlan_rx_vid(struct net_device *ndev, uint16_t vid,
+			       int enable)
+{
+	struct tn40_priv *priv = netdev_priv(ndev);
+	u32 reg, bit, val;
+
+	netdev_dbg(priv->ndev, "vid =%d value =%d\n", (int)vid, enable);
+	reg = TN40_REG_VLAN_0 + (vid / 32) * 4;
+	bit = 1 << vid % 32;
+	val = tn40_read_reg(priv, reg);
+	netdev_dbg(priv->ndev, "reg =%x, val =%x, bit =%d\n", reg, val, bit);
+	if (enable)
+		val |= bit;
+	else
+		val &= ~bit;
+	netdev_dbg(priv->ndev, "new val %x\n", val);
+	tn40_write_reg(priv, reg, val);
+}
+
+static int tn40_vlan_rx_add_vid(struct net_device *ndev,
+				__always_unused __be16 proto, u16 vid)
+{
+	__tn40_vlan_rx_vid(ndev, vid, 1);
+	return 0;
+}
+
+static int tn40_vlan_rx_kill_vid(struct net_device *ndev,
+				 __always_unused __be16 proto, u16 vid)
+{
+	__tn40_vlan_rx_vid(ndev, vid, 0);
+	return 0;
+}
+
+static void tn40_setmulti(struct net_device *ndev)
+{
+	u32 rxf_val = TN40_GMAC_RX_FILTER_AM | TN40_GMAC_RX_FILTER_AB |
+		TN40_GMAC_RX_FILTER_OSEN | TN40_GMAC_RX_FILTER_TXFC;
+	struct tn40_priv *priv = netdev_priv(ndev);
+	int i;
+
+	/* IMF - imperfect (hash) rx multicast filter */
+	/* PMF - perfect rx multicast filter */
+
+	/* FIXME: RXE(OFF) */
+	if (ndev->flags & IFF_PROMISC) {
+		rxf_val |= TN40_GMAC_RX_FILTER_PRM;
+	} else if (ndev->flags & IFF_ALLMULTI) {
+		/* set IMF to accept all multicast frames */
+		for (i = 0; i < TN40_MAC_MCST_HASH_NUM; i++)
+			tn40_write_reg(priv,
+				       TN40_REG_RX_MCST_HASH0 + i * 4, ~0);
+	} else if (netdev_mc_count(ndev)) {
+		struct netdev_hw_addr *mclist;
+		u32 reg, val;
+		u8 hash;
+
+		/* Set IMF to deny all multicast frames */
+		for (i = 0; i < TN40_MAC_MCST_HASH_NUM; i++)
+			tn40_write_reg(priv,
+				       TN40_REG_RX_MCST_HASH0 + i * 4, 0);
+
+		/* Set PMF to deny all multicast frames */
+		for (i = 0; i < TN40_MAC_MCST_NUM; i++) {
+			tn40_write_reg(priv,
+				       TN40_REG_RX_MAC_MCST0 + i * 8, 0);
+			tn40_write_reg(priv,
+				       TN40_REG_RX_MAC_MCST1 + i * 8, 0);
+		}
+		/* Use PMF to accept first MAC_MCST_NUM (15) addresses */
+
+		/* TBD: Sort the addresses and write them in ascending
+		 * order into RX_MAC_MCST regs. we skip this phase now
+		 * and accept ALL multicast frames through IMF. Accept
+		 * the rest of addresses throw IMF.
+		 */
+		netdev_for_each_mc_addr(mclist, ndev) {
+			hash = 0;
+			for (i = 0; i < ETH_ALEN; i++)
+				hash ^= mclist->addr[i];
+
+			reg = TN40_REG_RX_MCST_HASH0 + ((hash >> 5) << 2);
+			val = tn40_read_reg(priv, reg);
+			val |= (1 << (hash % 32));
+			tn40_write_reg(priv, reg, val);
+		}
+	} else {
+		rxf_val |= TN40_GMAC_RX_FILTER_AB;
+	}
+	tn40_write_reg(priv, TN40_REG_GMAC_RXF_A, rxf_val);
+	/* Enable RX */
+	/* FIXME: RXE(ON) */
+}
+
+static int tn40_set_mac(struct net_device *ndev, void *p)
+{
+	struct tn40_priv *priv = netdev_priv(ndev);
+	struct sockaddr *addr = p;
+
+	eth_hw_addr_set(ndev, addr->sa_data);
+	tn40_restore_mac(ndev, priv);
+	return 0;
+}
+
+static void tn40_mac_init(struct tn40_priv *priv)
+{
+	u8 addr[ETH_ALEN];
+	u64 val;
+
+	val = (u64)tn40_read_reg(priv, TN40_REG_UNC_MAC0_A);
+	val |= (u64)tn40_read_reg(priv, TN40_REG_UNC_MAC1_A) << 16;
+	val |= (u64)tn40_read_reg(priv, TN40_REG_UNC_MAC2_A) << 32;
+
+	u64_to_ether_addr(val, addr);
+	eth_hw_addr_set(priv->ndev, addr);
+}
+
+static void tn40_get_stats(struct net_device *ndev,
+			   struct rtnl_link_stats64 *stats)
+{
+	struct tn40_priv *priv = netdev_priv(ndev);
+	unsigned int start;
+
+	do {
+		start = u64_stats_fetch_begin(&priv->syncp);
+		stats->tx_packets = priv->stats.tx_packets;
+		stats->tx_bytes = priv->stats.tx_bytes;
+		stats->tx_dropped = priv->stats.tx_dropped;
+
+		stats->rx_packets = priv->stats.rx_packets;
+		stats->rx_bytes = priv->stats.rx_bytes;
+		stats->rx_dropped = priv->stats.rx_dropped;
+		stats->rx_errors = priv->stats.rx_errors;
+	} while (u64_stats_fetch_retry(&priv->syncp, start));
+}
+
+static const struct net_device_ops tn40_netdev_ops = {
+	.ndo_open = tn40_open,
+	.ndo_stop = tn40_close,
+	.ndo_start_xmit = tn40_start_xmit,
+	.ndo_validate_addr = eth_validate_addr,
+	.ndo_set_rx_mode = tn40_setmulti,
+	.ndo_get_stats64 = tn40_get_stats,
+	.ndo_set_mac_address = tn40_set_mac,
+	.ndo_vlan_rx_add_vid = tn40_vlan_rx_add_vid,
+	.ndo_vlan_rx_kill_vid = tn40_vlan_rx_kill_vid,
+};
+
+static int tn40_priv_init(struct tn40_priv *priv)
+{
+	int ret;
+
+	tn40_set_link_speed(priv, 0);
+
+	/* Set GPIO[9:0] to output 0 */
+	tn40_write_reg(priv, 0x51E0, 0x30010006);	/* GPIO_OE_ WR CMD */
+	tn40_write_reg(priv, 0x51F0, 0x0);	/* GPIO_OE_ DATA */
+	tn40_write_reg(priv, TN40_REG_MDIO_CMD_STAT, 0x3ec8);
+
+	/* we use tx descriptors to load a firmware. */
+	ret = tn40_create_tx_ring(priv);
+	if (ret)
+		return ret;
+	ret = tn40_fw_load(priv);
+	tn40_destroy_tx_ring(priv);
+	return ret;
+}
+
+static struct net_device *tn40_netdev_alloc(struct pci_dev *pdev)
+{
+	struct net_device *ndev;
+
+	ndev = devm_alloc_etherdev(&pdev->dev, sizeof(struct tn40_priv));
+	if (!ndev)
+		return NULL;
+	ndev->netdev_ops = &tn40_netdev_ops;
+	ndev->tx_queue_len = TN40_NDEV_TXQ_LEN;
+	ndev->mem_start = pci_resource_start(pdev, 0);
+	ndev->mem_end = pci_resource_end(pdev, 0);
+	ndev->min_mtu = ETH_ZLEN;
+	ndev->max_mtu = TN40_MAX_MTU;
+
+	ndev->features = NETIF_F_IP_CSUM |
+		NETIF_F_SG |
+		NETIF_F_FRAGLIST |
+		NETIF_F_TSO | NETIF_F_GRO |
+		NETIF_F_RXCSUM |
+		NETIF_F_RXHASH |
+		NETIF_F_HW_VLAN_CTAG_TX |
+		NETIF_F_HW_VLAN_CTAG_RX |
+		NETIF_F_HW_VLAN_CTAG_FILTER;
+	ndev->vlan_features = NETIF_F_IP_CSUM |
+			       NETIF_F_SG |
+			       NETIF_F_TSO | NETIF_F_GRO | NETIF_F_RXHASH;
+
+	if (dma_get_mask(&pdev->dev) == DMA_BIT_MASK(64)) {
+		ndev->features |= NETIF_F_HIGHDMA;
+		ndev->vlan_features |= NETIF_F_HIGHDMA;
+	}
+	ndev->hw_features |= ndev->features;
+
+	SET_NETDEV_DEV(ndev, &pdev->dev);
+	netif_stop_queue(ndev);
+	return ndev;
+}
+
+static int tn40_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	struct net_device *ndev;
+	struct tn40_priv *priv;
+	unsigned int nvec = 1;
+	void __iomem *regs;
+	int ret;
+
+	ret = pci_enable_device(pdev);
+	if (ret)
+		return ret;
+	ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+	if (ret) {
+		dev_err(&pdev->dev, "failed to set DMA mask.\n");
+		goto err_disable_device;
+	}
+
+	ret = pci_request_regions(pdev, TN40_DRV_NAME);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to request PCI regions.\n");
+		goto err_disable_device;
+	}
+
+	pci_set_master(pdev);
+
+	regs = pci_iomap(pdev, 0, TN40_REGS_SIZE);
+	if (!regs) {
+		ret = -EIO;
+		dev_err(&pdev->dev, "failed to map PCI bar.\n");
+		goto err_free_regions;
+	}
+
+	ndev = tn40_netdev_alloc(pdev);
+	if (!ndev) {
+		ret = -ENOMEM;
+		dev_err(&pdev->dev, "failed to allocate netdev.\n");
+		goto err_iounmap;
+	}
+
+	priv = netdev_priv(ndev);
+	pci_set_drvdata(pdev, priv);
+	netif_napi_add(ndev, &priv->napi, tn40_poll);
+
+	priv->regs = regs;
+	priv->pdev = pdev;
+	priv->ndev = ndev;
+	/* Initialize fifo sizes. */
+	priv->txd_size = 3;
+	priv->txf_size = 3;
+	priv->rxd_size = 3;
+	priv->rxf_size = 3;
+	/* Initialize the initial coalescing registers. */
+	priv->rdintcm = TN40_INT_REG_VAL(0x20, 1, 4, 12);
+	priv->tdintcm = TN40_INT_REG_VAL(0x20, 1, 0, 12);
+
+	ret = tn40_hw_reset(priv);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to reset HW.\n");
+		goto err_unset_drvdata;
+	}
+
+	ret = pci_alloc_irq_vectors(pdev, 1, nvec, PCI_IRQ_MSI);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to allocate irq.\n");
+		goto err_unset_drvdata;
+	}
+
+	ret = tn40_mdiobus_init(priv);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to initialize mdio bus.\n");
+		goto err_free_irq;
+	}
+
+	priv->stats_flag =
+		((tn40_read_reg(priv, TN40_FPGA_VER) & 0xFFF) != 308);
+	u64_stats_init(&priv->syncp);
+
+	priv->isr_mask = TN40_IR_RX_FREE_0 | TN40_IR_LNKCHG0 | TN40_IR_PSE |
+		TN40_IR_TMR0 | TN40_IR_RX_DESC_0 | TN40_IR_TX_FREE_0 |
+		TN40_IR_TMR1;
+
+	tn40_mac_init(priv);
+	ret = tn40_phy_register(priv);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to set up PHY.\n");
+		goto err_free_irq;
+	}
+
+	ret = tn40_priv_init(priv);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to initialize tn40_priv.\n");
+		goto err_unregister_phydev;
+	}
+
+	ret = register_netdev(ndev);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register netdev.\n");
+		goto err_unregister_phydev;
+	}
+	return 0;
+err_unregister_phydev:
+	tn40_phy_unregister(priv);
+err_free_irq:
+	pci_free_irq_vectors(pdev);
+err_unset_drvdata:
+	pci_set_drvdata(pdev, NULL);
+err_iounmap:
+	iounmap(regs);
+err_free_regions:
+	pci_release_regions(pdev);
+err_disable_device:
+	pci_disable_device(pdev);
+	return ret;
+}
+
+static void tn40_remove(struct pci_dev *pdev)
+{
+	struct tn40_priv *priv = pci_get_drvdata(pdev);
+	struct net_device *ndev = priv->ndev;
+
+	unregister_netdev(ndev);
+
+	tn40_phy_unregister(priv);
+	pci_free_irq_vectors(priv->pdev);
+	pci_set_drvdata(pdev, NULL);
+	iounmap(priv->regs);
+	pci_release_regions(pdev);
+	pci_disable_device(pdev);
+}
+
+static const struct pci_device_id tn40_id_table[] = {
+	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_TEHUTI, 0x4022,
+			 PCI_VENDOR_ID_TEHUTI, 0x3015) },
+	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_TEHUTI, 0x4022,
+			 PCI_VENDOR_ID_DLINK, 0x4d00) },
+	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_TEHUTI, 0x4022,
+			 PCI_VENDOR_ID_ASUSTEK, 0x8709) },
+	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_TEHUTI, 0x4022,
+			 PCI_VENDOR_ID_EDIMAX, 0x8103) },
+	{ }
+};
+
+static struct pci_driver tn40_driver = {
+	.name = TN40_DRV_NAME,
+	.id_table = tn40_id_table,
+	.probe = tn40_probe,
+	.remove = tn40_remove,
+};
+
+module_pci_driver(tn40_driver);
+
+MODULE_DEVICE_TABLE(pci, tn40_id_table);
+MODULE_LICENSE("GPL");
+MODULE_FIRMWARE(TN40_FIRMWARE_NAME);
+MODULE_DESCRIPTION("Tehuti Network TN40xx Driver");

drivers/net/ethernet/tehuti/tn40.h

+/* SPDX-License-Identifier: GPL-2.0+ */
+/* Copyright (c) Tehuti Networks Ltd. */
+
+#ifndef _TN40_H_
+#define _TN40_H_
+
+#include "tn40_regs.h"
+
+#define TN40_DRV_NAME "tn40xx"
+
+#define TN40_MDIO_SPEED_1MHZ (1)
+#define TN40_MDIO_SPEED_6MHZ (6)
+
+/* netdev tx queue len for Luxor. The default value is 1000.
+ * ifconfig eth1 txqueuelen 3000 - to change it at runtime.
+ */
+#define TN40_NDEV_TXQ_LEN 1000
+
+#define TN40_FIFO_SIZE 4096
+#define TN40_FIFO_EXTRA_SPACE 1024
+
+#define TN40_TXF_DESC_SZ 16
+#define TN40_MAX_TX_LEVEL (priv->txd_fifo0.m.memsz - 16)
+#define TN40_MIN_TX_LEVEL 256
+#define TN40_NO_UPD_PACKETS 40
+#define TN40_MAX_MTU BIT(14)
+
+#define TN40_PCK_TH_MULT 128
+#define TN40_INT_COAL_MULT 2
+
+#define TN40_INT_REG_VAL(coal, coal_rc, rxf_th, pck_th) (	\
+	FIELD_PREP(GENMASK(14, 0), (coal)) |		\
+	FIELD_PREP(BIT(15), (coal_rc)) |		\
+	FIELD_PREP(GENMASK(19, 16), (rxf_th)) |		\
+	FIELD_PREP(GENMASK(31, 20), (pck_th))		\
+	)
+
+struct tn40_fifo {
+	dma_addr_t da; /* Physical address of fifo (used by HW) */
+	char *va; /* Virtual address of fifo (used by SW) */
+	u32 rptr, wptr;
+	 /* Cached values of RPTR and WPTR registers,
+	  * they're 32 bits on both 32 and 64 archs.
+	  */
+	u16 reg_cfg0;
+	u16 reg_cfg1;
+	u16 reg_rptr;
+	u16 reg_wptr;
+	u16 memsz; /* Memory size allocated for fifo */
+	u16 size_mask;
+	u16 pktsz; /* Skb packet size to allocate */
+	u16 rcvno; /* Number of buffers that come from this RXF */
+};
+
+struct tn40_txf_fifo {
+	struct tn40_fifo m; /* The minimal set of variables used by all fifos */
+};
+
+struct tn40_txd_fifo {
+	struct tn40_fifo m; /* The minimal set of variables used by all fifos */
+};
+
+struct tn40_rxf_fifo {
+	struct tn40_fifo m; /* The minimal set of variables used by all fifos */
+};
+
+struct tn40_rxd_fifo {
+	struct tn40_fifo m; /* The minimal set of variables used by all fifos */
+};
+
+struct tn40_rx_map {
+	struct page *page;
+};
+
+struct tn40_rxdb {
+	unsigned int *stack;
+	struct tn40_rx_map *elems;
+	unsigned int nelem;
+	unsigned int top;
+};
+
+union tn40_tx_dma_addr {
+	dma_addr_t dma;
+	struct sk_buff *skb;
+};
+
+/* Entry in the db.
+ * if len == 0 addr is dma
+ * if len != 0 addr is skb
+ */
+struct tn40_tx_map {
+	union tn40_tx_dma_addr addr;
+	int len;
+};
+
+/* tx database - implemented as circular fifo buffer */
+struct tn40_txdb {
+	struct tn40_tx_map *start; /* Points to the first element */
+	struct tn40_tx_map *end; /* Points just AFTER the last element */
+	struct tn40_tx_map *rptr; /* Points to the next element to read */
+	struct tn40_tx_map *wptr; /* Points to the next element to write */
+	int size; /* Number of elements in the db */
+};
+
+struct tn40_priv {
+	struct net_device *ndev;
+	struct pci_dev *pdev;
+
+	struct napi_struct napi;
+	/* RX FIFOs: 1 for data (full) descs, and 2 for free descs */
+	struct tn40_rxd_fifo rxd_fifo0;
+	struct tn40_rxf_fifo rxf_fifo0;
+	struct tn40_rxdb *rxdb0; /* Rx dbs to store skb pointers */
+	struct page_pool *page_pool;
+
+	/* Tx FIFOs: 1 for data desc, 1 for empty (acks) desc */
+	struct tn40_txd_fifo txd_fifo0;
+	struct tn40_txf_fifo txf_fifo0;
+	struct tn40_txdb txdb;
+	int tx_level;
+	int tx_update_mark;
+	int tx_noupd;
+
+	int stats_flag;
+	struct rtnl_link_stats64 stats;
+	struct u64_stats_sync syncp;
+
+	u8 txd_size;
+	u8 txf_size;
+	u8 rxd_size;
+	u8 rxf_size;
+	u32 rdintcm;
+	u32 tdintcm;
+
+	u32 isr_mask;
+
+	void __iomem *regs;
+
+	/* SHORT_PKT_FIX */
+	u32 b0_len;
+	dma_addr_t b0_dma; /* Physical address of buffer */
+	char *b0_va; /* Virtual address of buffer */
+
+	struct mii_bus *mdio;
+	struct phy_device *phydev;
+	struct phylink *phylink;
+	struct phylink_config phylink_config;
+};
+
+/* RX FREE descriptor - 64bit */
+struct tn40_rxf_desc {
+	__le32 info; /* Buffer Count + Info - described below */
+	__le32 va_lo; /* VAdr[31:0] */
+	__le32 va_hi; /* VAdr[63:32] */
+	__le32 pa_lo; /* PAdr[31:0] */
+	__le32 pa_hi; /* PAdr[63:32] */
+	__le32 len; /* Buffer Length */
+};
+
+#define TN40_GET_RXD_BC(x) FIELD_GET(GENMASK(4, 0), (x))
+#define TN40_GET_RXD_ERR(x) FIELD_GET(GENMASK(26, 21), (x))
+#define TN40_GET_RXD_PKT_ID(x) FIELD_GET(GENMASK(30, 28), (x))
+#define TN40_GET_RXD_VTAG(x) FIELD_GET(BIT(31), (x))
+#define TN40_GET_RXD_VLAN_TCI(x) FIELD_GET(GENMASK(15, 0), (x))
+
+struct tn40_rxd_desc {
+	__le32 rxd_val1;
+	__le16 len;
+	__le16 rxd_vlan;
+	__le32 va_lo;
+	__le32 va_hi;
+	__le32 rss_lo;
+	__le32 rss_hash;
+};
+
+#define TN40_MAX_PBL (19)
+/* PBL describes each virtual buffer to be transmitted from the host. */
+struct tn40_pbl {
+	__le32 pa_lo;
+	__le32 pa_hi;
+	__le32 len;
+};
+
+/* First word for TXD descriptor. It means: type = 3 for regular Tx packet,
+ * hw_csum = 7 for IP+UDP+TCP HW checksums.
+ */
+#define TN40_TXD_W1_VAL(bc, checksum, vtag, lgsnd, vlan_id) (		\
+	GENMASK(17, 16) |						\
+	FIELD_PREP(GENMASK(4, 0), (bc)) |				\
+	FIELD_PREP(GENMASK(7, 5), (checksum)) |				\
+	FIELD_PREP(BIT(8), (vtag)) |					\
+	FIELD_PREP(GENMASK(12, 9), (lgsnd)) |				\
+	FIELD_PREP(GENMASK(15, 13),					\
+		   FIELD_GET(GENMASK(15, 13), (vlan_id))) |		\
+	FIELD_PREP(GENMASK(31, 20),					\
+		   FIELD_GET(GENMASK(11, 0), (vlan_id)))		\
+	)
+
+struct tn40_txd_desc {
+	__le32 txd_val1;
+	__le16 mss;
+	__le16 length;
+	__le32 va_lo;
+	__le32 va_hi;
+	struct tn40_pbl pbl[]; /* Fragments */
+};
+
+struct tn40_txf_desc {
+	u32 status;
+	u32 va_lo; /* VAdr[31:0] */
+	u32 va_hi; /* VAdr[63:32] */
+	u32 pad;
+};
+
+static inline u32 tn40_read_reg(struct tn40_priv *priv, u32 reg)
+{
+	return readl(priv->regs + reg);
+}
+
+static inline void tn40_write_reg(struct tn40_priv *priv, u32 reg, u32 val)
+{
+	writel(val, priv->regs + reg);
+}
+
+int tn40_set_link_speed(struct tn40_priv *priv, u32 speed);
+
+int tn40_mdiobus_init(struct tn40_priv *priv);
+
+int tn40_phy_register(struct tn40_priv *priv);
+void tn40_phy_unregister(struct tn40_priv *priv);
+
+#endif /* _TN40XX_H */

drivers/net/ethernet/tehuti/tn40_mdio.c

+// SPDX-License-Identifier: GPL-2.0+
+/* Copyright (c) Tehuti Networks Ltd. */
+
+#include <linux/netdevice.h>
+#include <linux/pci.h>
+#include <linux/phylink.h>
+
+#include "tn40.h"
+
+#define TN40_MDIO_DEVAD_MASK GENMASK(4, 0)
+#define TN40_MDIO_PRTAD_MASK GENMASK(9, 5)
+#define TN40_MDIO_CMD_VAL(device, port)			\
+	(FIELD_PREP(TN40_MDIO_DEVAD_MASK, (device)) |	\
+	 (FIELD_PREP(TN40_MDIO_PRTAD_MASK, (port))))
+#define TN40_MDIO_CMD_READ BIT(15)
+
+static void tn40_mdio_set_speed(struct tn40_priv *priv, u32 speed)
+{
+	void __iomem *regs = priv->regs;
+	int mdio_cfg;
+
+	if (speed == TN40_MDIO_SPEED_1MHZ)
+		mdio_cfg = (0x7d << 7) | 0x08;	/* 1MHz */
+	else
+		mdio_cfg = 0xA08;	/* 6MHz */
+	mdio_cfg |= (1 << 6);
+	writel(mdio_cfg, regs + TN40_REG_MDIO_CMD_STAT);
+	msleep(100);
+}
+
+static u32 tn40_mdio_stat(struct tn40_priv *priv)
+{
+	void __iomem *regs = priv->regs;
+
+	return readl(regs + TN40_REG_MDIO_CMD_STAT);
+}
+
+static int tn40_mdio_wait_nobusy(struct tn40_priv *priv, u32 *val)
+{
+	u32 stat;
+	int ret;
+
+	ret = readx_poll_timeout_atomic(tn40_mdio_stat, priv, stat,
+					TN40_GET_MDIO_BUSY(stat) == 0, 10,
+					10000);
+	if (val)
+		*val = stat;
+	return ret;
+}
+
+static int tn40_mdio_read(struct tn40_priv *priv, int port, int device,
+			  u16 regnum)
+{
+	void __iomem *regs = priv->regs;
+	u32 i;
+
+	/* wait until MDIO is not busy */
+	if (tn40_mdio_wait_nobusy(priv, NULL))
+		return -EIO;
+
+	i = TN40_MDIO_CMD_VAL(device, port);
+	writel(i, regs + TN40_REG_MDIO_CMD);
+	writel((u32)regnum, regs + TN40_REG_MDIO_ADDR);
+	if (tn40_mdio_wait_nobusy(priv, NULL))
+		return -EIO;
+
+	writel(TN40_MDIO_CMD_READ | i, regs + TN40_REG_MDIO_CMD);
+	/* read CMD_STAT until not busy */
+	if (tn40_mdio_wait_nobusy(priv, NULL))
+		return -EIO;
+
+	return lower_16_bits(readl(regs + TN40_REG_MDIO_DATA));
+}
+
+static int tn40_mdio_write(struct tn40_priv *priv, int port, int device,
+			   u16 regnum, u16 data)
+{
+	void __iomem *regs = priv->regs;
+	u32 tmp_reg = 0;
+	int ret;
+
+	/* wait until MDIO is not busy */
+	if (tn40_mdio_wait_nobusy(priv, NULL))
+		return -EIO;
+	writel(TN40_MDIO_CMD_VAL(device, port), regs + TN40_REG_MDIO_CMD);
+	writel((u32)regnum, regs + TN40_REG_MDIO_ADDR);
+	if (tn40_mdio_wait_nobusy(priv, NULL))
+		return -EIO;
+	writel((u32)data, regs + TN40_REG_MDIO_DATA);
+	/* read CMD_STAT until not busy */
+	ret = tn40_mdio_wait_nobusy(priv, &tmp_reg);
+	if (ret)
+		return -EIO;
+
+	if (TN40_GET_MDIO_RD_ERR(tmp_reg)) {
+		dev_err(&priv->pdev->dev, "MDIO error after write command\n");
+		return -EIO;
+	}
+	return 0;
+}
+
+static int tn40_mdio_read_c45(struct mii_bus *mii_bus, int addr, int devnum,
+			      int regnum)
+{
+	return tn40_mdio_read(mii_bus->priv, addr, devnum, regnum);
+}
+
+static int tn40_mdio_write_c45(struct mii_bus *mii_bus, int addr, int devnum,
+			       int regnum, u16 val)
+{
+	return  tn40_mdio_write(mii_bus->priv, addr, devnum, regnum, val);
+}
+
+int tn40_mdiobus_init(struct tn40_priv *priv)
+{
+	struct pci_dev *pdev = priv->pdev;
+	struct mii_bus *bus;
+	int ret;
+
+	bus = devm_mdiobus_alloc(&pdev->dev);
+	if (!bus)
+		return -ENOMEM;
+
+	bus->name = TN40_DRV_NAME;
+	bus->parent = &pdev->dev;
+	snprintf(bus->id, MII_BUS_ID_SIZE, "tn40xx-%x-%x",
+		 pci_domain_nr(pdev->bus), pci_dev_id(pdev));
+	bus->priv = priv;
+
+	bus->read_c45 = tn40_mdio_read_c45;
+	bus->write_c45 = tn40_mdio_write_c45;
+
+	ret = devm_mdiobus_register(&pdev->dev, bus);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register mdiobus %d %u %u\n",
+			ret, bus->state, MDIOBUS_UNREGISTERED);
+		return ret;
+	}
+	tn40_mdio_set_speed(priv, TN40_MDIO_SPEED_6MHZ);
+	priv->mdio = bus;
+	return 0;
+}

drivers/net/ethernet/tehuti/tn40_phy.c

+// SPDX-License-Identifier: GPL-2.0+
+/* Copyright (c) Tehuti Networks Ltd. */
+
+#include <linux/netdevice.h>
+#include <linux/pci.h>
+#include <linux/phylink.h>
+
+#include "tn40.h"
+
+static struct tn40_priv *tn40_config_to_priv(struct phylink_config *config)
+{
+	return container_of(config, struct tn40_priv, phylink_config);
+}
+
+static void tn40_link_up(struct phylink_config *config, struct phy_device *phy,
+			 unsigned int mode, phy_interface_t interface,
+			 int speed, int duplex, bool tx_pause, bool rx_pause)
+{
+	struct tn40_priv *priv = tn40_config_to_priv(config);
+
+	tn40_set_link_speed(priv, speed);
+	netif_wake_queue(priv->ndev);
+}
+
+static void tn40_link_down(struct phylink_config *config, unsigned int mode,
+			   phy_interface_t interface)
+{
+	struct tn40_priv *priv = tn40_config_to_priv(config);
+
+	netif_stop_queue(priv->ndev);
+	tn40_set_link_speed(priv, 0);
+}
+
+static void tn40_mac_config(struct phylink_config *config, unsigned int mode,
+			    const struct phylink_link_state *state)
+{
+}
+
+static const struct phylink_mac_ops tn40_mac_ops = {
+	.mac_config = tn40_mac_config,
+	.mac_link_up = tn40_link_up,
+	.mac_link_down = tn40_link_down,
+};
+
+int tn40_phy_register(struct tn40_priv *priv)
+{
+	struct phylink_config *config;
+	struct phy_device *phydev;
+	struct phylink *phylink;
+
+	phydev = phy_find_first(priv->mdio);
+	if (!phydev) {
+		dev_err(&priv->pdev->dev, "PHY isn't found\n");
+		return -ENODEV;
+	}
+
+	config = &priv->phylink_config;
+	config->dev = &priv->ndev->dev;
+	config->type = PHYLINK_NETDEV;
+	config->mac_capabilities = MAC_10000FD;
+	__set_bit(PHY_INTERFACE_MODE_XAUI, config->supported_interfaces);
+
+	phylink = phylink_create(config, NULL, PHY_INTERFACE_MODE_XAUI,
+				 &tn40_mac_ops);
+	if (IS_ERR(phylink))
+		return PTR_ERR(phylink);
+
+	priv->phydev = phydev;
+	priv->phylink = phylink;
+	return 0;
+}
+
+void tn40_phy_unregister(struct tn40_priv *priv)
+{
+	phylink_destroy(priv->phylink);
+}

drivers/net/ethernet/tehuti/tn40_regs.h

+/* SPDX-License-Identifier: GPL-2.0+ */
+/* Copyright (c) Tehuti Networks Ltd. */
+
+#ifndef _TN40_REGS_H_
+#define _TN40_REGS_H_
+
+/* Register region size */
+#define TN40_REGS_SIZE 0x10000
+
+/* Registers from 0x0000-0x00fc were remapped to 0x4000-0x40fc */
+#define TN40_REG_TXD_CFG1_0 0x4000
+#define TN40_REG_TXD_CFG1_1 0x4004
+#define TN40_REG_TXD_CFG1_2 0x4008
+#define TN40_REG_TXD_CFG1_3 0x400C
+
+#define TN40_REG_RXF_CFG1_0 0x4010
+#define TN40_REG_RXF_CFG1_1 0x4014
+#define TN40_REG_RXF_CFG1_2 0x4018
+#define TN40_REG_RXF_CFG1_3 0x401C
+
+#define TN40_REG_RXD_CFG1_0 0x4020
+#define TN40_REG_RXD_CFG1_1 0x4024
+#define TN40_REG_RXD_CFG1_2 0x4028
+#define TN40_REG_RXD_CFG1_3 0x402C
+
+#define TN40_REG_TXF_CFG1_0 0x4030
+#define TN40_REG_TXF_CFG1_1 0x4034
+#define TN40_REG_TXF_CFG1_2 0x4038
+#define TN40_REG_TXF_CFG1_3 0x403C
+
+#define TN40_REG_TXD_CFG0_0 0x4040
+#define TN40_REG_TXD_CFG0_1 0x4044
+#define TN40_REG_TXD_CFG0_2 0x4048
+#define TN40_REG_TXD_CFG0_3 0x404C
+
+#define TN40_REG_RXF_CFG0_0 0x4050
+#define TN40_REG_RXF_CFG0_1 0x4054
+#define TN40_REG_RXF_CFG0_2 0x4058
+#define TN40_REG_RXF_CFG0_3 0x405C
+
+#define TN40_REG_RXD_CFG0_0 0x4060
+#define TN40_REG_RXD_CFG0_1 0x4064
+#define TN40_REG_RXD_CFG0_2 0x4068
+#define TN40_REG_RXD_CFG0_3 0x406C
+
+#define TN40_REG_TXF_CFG0_0 0x4070
+#define TN40_REG_TXF_CFG0_1 0x4074
+#define TN40_REG_TXF_CFG0_2 0x4078
+#define TN40_REG_TXF_CFG0_3 0x407C
+
+#define TN40_REG_TXD_WPTR_0 0x4080
+#define TN40_REG_TXD_WPTR_1 0x4084
+#define TN40_REG_TXD_WPTR_2 0x4088
+#define TN40_REG_TXD_WPTR_3 0x408C
+
+#define TN40_REG_RXF_WPTR_0 0x4090
+#define TN40_REG_RXF_WPTR_1 0x4094
+#define TN40_REG_RXF_WPTR_2 0x4098
+#define TN40_REG_RXF_WPTR_3 0x409C
+
+#define TN40_REG_RXD_WPTR_0 0x40A0
+#define TN40_REG_RXD_WPTR_1 0x40A4
+#define TN40_REG_RXD_WPTR_2 0x40A8
+#define TN40_REG_RXD_WPTR_3 0x40AC
+
+#define TN40_REG_TXF_WPTR_0 0x40B0
+#define TN40_REG_TXF_WPTR_1 0x40B4
+#define TN40_REG_TXF_WPTR_2 0x40B8
+#define TN40_REG_TXF_WPTR_3 0x40BC
+
+#define TN40_REG_TXD_RPTR_0 0x40C0
+#define TN40_REG_TXD_RPTR_1 0x40C4
+#define TN40_REG_TXD_RPTR_2 0x40C8
+#define TN40_REG_TXD_RPTR_3 0x40CC
+
+#define TN40_REG_RXF_RPTR_0 0x40D0
+#define TN40_REG_RXF_RPTR_1 0x40D4
+#define TN40_REG_RXF_RPTR_2 0x40D8
+#define TN40_REG_RXF_RPTR_3 0x40DC
+
+#define TN40_REG_RXD_RPTR_0 0x40E0
+#define TN40_REG_RXD_RPTR_1 0x40E4
+#define TN40_REG_RXD_RPTR_2 0x40E8
+#define TN40_REG_RXD_RPTR_3 0x40EC
+
+#define TN40_REG_TXF_RPTR_0 0x40F0
+#define TN40_REG_TXF_RPTR_1 0x40F4
+#define TN40_REG_TXF_RPTR_2 0x40F8
+#define TN40_REG_TXF_RPTR_3 0x40FC
+
+/* Hardware versioning */
+#define TN40_FPGA_VER 0x5030
+
+/* Registers from 0x0100-0x0150 were remapped to 0x5100-0x5150 */
+#define TN40_REG_ISR TN40_REG_ISR0
+#define TN40_REG_ISR0 0x5100
+
+#define TN40_REG_IMR TN40_REG_IMR0
+#define TN40_REG_IMR0 0x5110
+
+#define TN40_REG_RDINTCM0 0x5120
+#define TN40_REG_RDINTCM2 0x5128
+
+#define TN40_REG_TDINTCM0 0x5130
+
+#define TN40_REG_ISR_MSK0 0x5140
+
+#define TN40_REG_INIT_SEMAPHORE 0x5170
+#define TN40_REG_INIT_STATUS 0x5180
+
+#define TN40_REG_MAC_LNK_STAT 0x0200
+#define TN40_MAC_LINK_STAT 0x0004 /* Link state */
+
+#define TN40_REG_BLNK_LED 0x0210
+
+#define TN40_REG_GMAC_RXF_A 0x1240
+
+#define TN40_REG_UNC_MAC0_A 0x1250
+#define TN40_REG_UNC_MAC1_A 0x1260
+#define TN40_REG_UNC_MAC2_A 0x1270
+
+#define TN40_REG_VLAN_0 0x1800
+
+#define TN40_REG_MAX_FRAME_A 0x12C0
+
+#define TN40_REG_RX_MAC_MCST0 0x1A80
+#define TN40_REG_RX_MAC_MCST1 0x1A84
+#define TN40_MAC_MCST_NUM 15
+#define TN40_REG_RX_MCST_HASH0 0x1A00
+#define TN40_MAC_MCST_HASH_NUM 8
+
+#define TN40_REG_VPC 0x2300
+#define TN40_REG_VIC 0x2320
+#define TN40_REG_VGLB 0x2340
+
+#define TN40_REG_CLKPLL 0x5000
+
+/* MDIO interface */
+
+#define TN40_REG_MDIO_CMD_STAT 0x6030
+#define TN40_REG_MDIO_CMD 0x6034
+#define TN40_REG_MDIO_DATA 0x6038
+#define TN40_REG_MDIO_ADDR 0x603C
+#define TN40_GET_MDIO_BUSY(x) FIELD_GET(GENMASK(0, 0), (x))
+#define TN40_GET_MDIO_RD_ERR(x) FIELD_GET(GENMASK(1, 1), (x))
+
+#define TN40_REG_REVISION 0x6000
+#define TN40_REG_SCRATCH 0x6004
+#define TN40_REG_CTRLST 0x6008
+#define TN40_REG_MAC_ADDR_0 0x600C
+#define TN40_REG_MAC_ADDR_1 0x6010
+#define TN40_REG_FRM_LENGTH 0x6014
+#define TN40_REG_PAUSE_QUANT 0x6054
+#define TN40_REG_RX_FIFO_SECTION 0x601C
+#define TN40_REG_TX_FIFO_SECTION 0x6020
+#define TN40_REG_RX_FULLNESS 0x6024
+#define TN40_REG_TX_FULLNESS 0x6028
+#define TN40_REG_HASHTABLE 0x602C
+
+#define TN40_REG_RST_PORT 0x7000
+#define TN40_REG_DIS_PORT 0x7010
+#define TN40_REG_RST_QU 0x7020
+#define TN40_REG_DIS_QU 0x7030
+
+#define TN40_REG_CTRLST_TX_ENA 0x0001
+#define TN40_REG_CTRLST_RX_ENA 0x0002
+#define TN40_REG_CTRLST_PRM_ENA 0x0010
+#define TN40_REG_CTRLST_PAD_ENA 0x0020
+
+#define TN40_REG_CTRLST_BASE (TN40_REG_CTRLST_PAD_ENA | REG_CTRLST_PRM_ENA)
+
+/* TXD TXF RXF RXD  CONFIG 0x0000 --- 0x007c */
+#define TN40_TX_RX_CFG1_BASE 0xffffffff /*0-31 */
+#define TN40_TX_RX_CFG0_BASE 0xfffff000 /*31:12 */
+#define TN40_TX_RX_CFG0_RSVD 0x00000ffc /*11:2 */
+#define TN40_TX_RX_CFG0_SIZE 0x00000003 /*1:0 */
+
+/* TXD TXF RXF RXD  WRITE 0x0080 --- 0x00BC */
+#define TN40_TXF_WPTR_WR_PTR 0x00007ff8 /*14:3 */
+
+/* TXD TXF RXF RXD  READ  0x00CO --- 0x00FC */
+#define TN40_TXF_RPTR_RD_PTR 0x00007ff8 /*14:3 */
+
+/* The last 4 bits are dropped size is rounded to 16 */
+#define TN40_TXF_WPTR_MASK 0x7ff0
+
+/* regISR 0x0100 */
+/* regIMR 0x0110 */
+#define TN40_IMR_INPROG 0x80000000 /*31 */
+#define TN40_IR_LNKCHG1 0x10000000 /*28 */
+#define TN40_IR_LNKCHG0 0x08000000 /*27 */
+#define TN40_IR_GPIO 0x04000000 /*26 */
+#define TN40_IR_RFRSH 0x02000000 /*25 */
+#define TN40_IR_RSVD 0x01000000 /*24 */
+#define TN40_IR_SWI 0x00800000 /*23 */
+#define TN40_IR_RX_FREE_3 0x00400000 /*22 */
+#define TN40_IR_RX_FREE_2 0x00200000 /*21 */
+#define TN40_IR_RX_FREE_1 0x00100000 /*20 */
+#define TN40_IR_RX_FREE_0 0x00080000 /*19 */
+#define TN40_IR_TX_FREE_3 0x00040000 /*18 */
+#define TN40_IR_TX_FREE_2 0x00020000 /*17 */
+#define TN40_IR_TX_FREE_1 0x00010000 /*16 */
+#define TN40_IR_TX_FREE_0 0x00008000 /*15 */
+#define TN40_IR_RX_DESC_3 0x00004000 /*14 */
+#define TN40_IR_RX_DESC_2 0x00002000 /*13 */
+#define TN40_IR_RX_DESC_1 0x00001000 /*12 */
+#define TN40_IR_RX_DESC_0 0x00000800 /*11 */
+#define TN40_IR_PSE 0x00000400 /*10 */
+#define TN40_IR_TMR3 0x00000200 /* 9 */
+#define TN40_IR_TMR2 0x00000100 /* 8 */
+#define TN40_IR_TMR1 0x00000080 /* 7 */
+#define TN40_IR_TMR0 0x00000040 /* 6 */
+#define TN40_IR_VNT 0x00000020 /* 5 */
+#define TN40_IR_RxFL 0x00000010 /* 4 */
+#define TN40_IR_SDPERR 0x00000008 /* 3 */
+#define TN40_IR_TR 0x00000004 /* 2 */
+#define TN40_IR_PCIE_LINK 0x00000002 /* 1 */
+#define TN40_IR_PCIE_TOUT 0x00000001 /* 0 */
+
+#define TN40_IR_EXTRA						\
+	(TN40_IR_RX_FREE_0 | TN40_IR_LNKCHG0 | TN40_IR_LNKCHG1 |\
+	TN40_IR_PSE | TN40_IR_TMR0 | TN40_IR_PCIE_LINK |	\
+	TN40_IR_PCIE_TOUT)
+
+#define TN40_GMAC_RX_FILTER_OSEN 0x1000 /* shared OS enable */
+#define TN40_GMAC_RX_FILTER_TXFC 0x0400 /* Tx flow control */
+#define TN40_GMAC_RX_FILTER_RSV0 0x0200 /* reserved */
+#define TN40_GMAC_RX_FILTER_FDA 0x0100 /* filter out direct address */
+#define TN40_GMAC_RX_FILTER_AOF 0x0080 /* accept over run */
+#define TN40_GMAC_RX_FILTER_ACF 0x0040 /* accept control frames */
+#define TN40_GMAC_RX_FILTER_ARUNT 0x0020 /* accept under run */
+#define TN40_GMAC_RX_FILTER_ACRC 0x0010 /* accept crc error */
+#define TN40_GMAC_RX_FILTER_AM 0x0008 /* accept multicast */
+#define TN40_GMAC_RX_FILTER_AB 0x0004 /* accept broadcast */
+#define TN40_GMAC_RX_FILTER_PRM 0x0001 /* [0:1] promiscuous mode */
+
+#define TN40_MAX_FRAME_AB_VAL 0x3fff /* 13:0 */
+
+#define TN40_CLKPLL_PLLLKD 0x0200 /* 9 */
+#define TN40_CLKPLL_RSTEND 0x0100 /* 8 */
+#define TN40_CLKPLL_SFTRST 0x0001 /* 0 */
+
+#define TN40_CLKPLL_LKD (TN40_CLKPLL_PLLLKD | TN40_CLKPLL_RSTEND)
+
+#endif

include/linux/pci_ids.h

@@ -2126,6 +2126,8 @@
 
 #define PCI_VENDOR_ID_CHELSIO		0x1425
 
+#define PCI_VENDOR_ID_EDIMAX		0x1432
+
 #define PCI_VENDOR_ID_ADLINK		0x144a
 
 #define PCI_VENDOR_ID_SAMSUNG		0x144d