Message-ID: <7b2b53b6-d230-47bb-98d9-b7acfbfdd8ca@gmail.com>
Date: Thu, 29 Jan 2026 18:18:15 +0100
From: Heiner Kallweit <hkallweit1@...il.com>
To: Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 David Miller <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Simon Horman <horms@...nel.org>, Andrew Lunn <andrew+netdev@...n.ch>,
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
 Vadim Fedorenko <vadim.fedorenko@...ux.dev>,
 Lorenzo Bianconi <lorenzo@...nel.org>, Hauke Mehrtens <hauke@...ke-m.de>
Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
 "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
 OpenWrt Development List <openwrt-devel@...ts.openwrt.org>,
 Daniel Golle <daniel@...rotopia.org>
Subject: [PATCH net-next] net: lantiq_etop: remove driver

This driver in mainline lost its in-tree user with commit cd93b4895ea5
("MIPS: lantiq: drop mips_machine support") in 2012. Since then it has
had no in-tree user. Only user seems to be OpenWRT, with several changes
to the in-tree driver version:
target/linux/lantiq/patches-6.12/035-owrt-lantiq-wifi-and-ethernet-eeprom-handling.patch
target/linux/lantiq/patches-6.12/028-NET-lantiq-various-etop-fixes.patch
target/linux/lantiq/patches-6.12/701-NET-lantiq-etop-of-mido.patch
So it seems the driver is maintained in OpenWrt only, except tree-wide
in-tree changes. According to OpenWRT maintainers it would be ok to
remove the driver in mainline and keep it downstream only (see linked
conversation).

Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
Link: https://lore.kernel.org/netdev/d80fef86-ba14-4bd4-bce5-4d61a75d591b@hauke-m.de/T/#t
---
 .../include/asm/mach-lantiq/lantiq_platform.h |  18 -
 drivers/net/ethernet/Kconfig                  |   6 -
 drivers/net/ethernet/Makefile                 |   1 -
 drivers/net/ethernet/lantiq_etop.c            | 745 ------------------
 4 files changed, 770 deletions(-)
 delete mode 100644 arch/mips/include/asm/mach-lantiq/lantiq_platform.h
 delete mode 100644 drivers/net/ethernet/lantiq_etop.c

diff --git a/arch/mips/include/asm/mach-lantiq/lantiq_platform.h b/arch/mips/include/asm/mach-lantiq/lantiq_platform.h
deleted file mode 100644
index 70ebb4d6f05..00000000000
--- a/arch/mips/include/asm/mach-lantiq/lantiq_platform.h
+++ /dev/null
@@ -1,18 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- *
- *  Copyright (C) 2010 John Crispin <john@...ozen.org>
- */
-
-#ifndef _LANTIQ_PLATFORM_H__
-#define _LANTIQ_PLATFORM_H__
-
-#include <linux/socket.h>
-
-/* struct used to pass info to network drivers */
-struct ltq_eth_data {
-	struct sockaddr mac;
-	int mii_mode;
-};
-
-#endif
diff --git a/drivers/net/ethernet/Kconfig b/drivers/net/ethernet/Kconfig
index aa7103e7f47..9775fd401b0 100644
--- a/drivers/net/ethernet/Kconfig
+++ b/drivers/net/ethernet/Kconfig
@@ -93,12 +93,6 @@ config KORINA
 	  If you have a Mikrotik RouterBoard 500 or IDT RC32434
 	  based system say Y. Otherwise say N.
 
-config LANTIQ_ETOP
-	tristate "Lantiq SoC ETOP driver"
-	depends on SOC_TYPE_XWAY
-	help
-	  Support for the MII0 inside the Lantiq SoC
-
 config LANTIQ_XRX200
 	tristate "Lantiq / Intel xRX200 PMAC network driver"
 	depends on SOC_TYPE_XWAY
diff --git a/drivers/net/ethernet/Makefile b/drivers/net/ethernet/Makefile
index 6615a67a63d..743ec1b7e5f 100644
--- a/drivers/net/ethernet/Makefile
+++ b/drivers/net/ethernet/Makefile
@@ -53,7 +53,6 @@ obj-$(CONFIG_NET_VENDOR_MICROSOFT) += microsoft/
 obj-$(CONFIG_NET_VENDOR_XSCALE) += xscale/
 obj-$(CONFIG_JME) += jme.o
 obj-$(CONFIG_KORINA) += korina.o
-obj-$(CONFIG_LANTIQ_ETOP) += lantiq_etop.o
 obj-$(CONFIG_LANTIQ_XRX200) += lantiq_xrx200.o
 obj-$(CONFIG_NET_VENDOR_LITEX) += litex/
 obj-$(CONFIG_NET_VENDOR_MARVELL) += marvell/
diff --git a/drivers/net/ethernet/lantiq_etop.c b/drivers/net/ethernet/lantiq_etop.c
deleted file mode 100644
index 83ce3bfefa5..00000000000
--- a/drivers/net/ethernet/lantiq_etop.c
+++ /dev/null
@@ -1,745 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- *
- *   Copyright (C) 2011 John Crispin <blogic@...nwrt.org>
- */
-
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/errno.h>
-#include <linux/types.h>
-#include <linux/interrupt.h>
-#include <linux/uaccess.h>
-#include <linux/in.h>
-#include <linux/netdevice.h>
-#include <linux/etherdevice.h>
-#include <linux/phy.h>
-#include <linux/ip.h>
-#include <linux/tcp.h>
-#include <linux/skbuff.h>
-#include <linux/mm.h>
-#include <linux/platform_device.h>
-#include <linux/ethtool.h>
-#include <linux/init.h>
-#include <linux/delay.h>
-#include <linux/io.h>
-#include <linux/dma-mapping.h>
-#include <linux/module.h>
-#include <linux/property.h>
-
-#include <asm/checksum.h>
-
-#include <lantiq_soc.h>
-#include <xway_dma.h>
-#include <lantiq_platform.h>
-
-#define LTQ_ETOP_MDIO		0x11804
-#define MDIO_REQUEST		0x80000000
-#define MDIO_READ		0x40000000
-#define MDIO_ADDR_MASK		0x1f
-#define MDIO_ADDR_OFFSET	0x15
-#define MDIO_REG_MASK		0x1f
-#define MDIO_REG_OFFSET		0x10
-#define MDIO_VAL_MASK		0xffff
-
-#define PPE32_CGEN		0x800
-#define LQ_PPE32_ENET_MAC_CFG	0x1840
-
-#define LTQ_ETOP_ENETS0		0x11850
-#define LTQ_ETOP_MAC_DA0	0x1186C
-#define LTQ_ETOP_MAC_DA1	0x11870
-#define LTQ_ETOP_CFG		0x16020
-#define LTQ_ETOP_IGPLEN		0x16080
-
-#define MAX_DMA_CHAN		0x8
-#define MAX_DMA_CRC_LEN		0x4
-#define MAX_DMA_DATA_LEN	0x600
-
-#define ETOP_FTCU		BIT(28)
-#define ETOP_MII_MASK		0xf
-#define ETOP_MII_NORMAL		0xd
-#define ETOP_MII_REVERSE	0xe
-#define ETOP_PLEN_UNDER		0x40
-#define ETOP_CGEN		0x800
-
-/* use 2 static channels for TX/RX */
-#define LTQ_ETOP_TX_CHANNEL	1
-#define LTQ_ETOP_RX_CHANNEL	6
-#define IS_TX(x)		((x) == LTQ_ETOP_TX_CHANNEL)
-#define IS_RX(x)		((x) == LTQ_ETOP_RX_CHANNEL)
-
-#define ltq_etop_r32(x)		ltq_r32(ltq_etop_membase + (x))
-#define ltq_etop_w32(x, y)	ltq_w32(x, ltq_etop_membase + (y))
-#define ltq_etop_w32_mask(x, y, z)	\
-		ltq_w32_mask(x, y, ltq_etop_membase + (z))
-
-#define DRV_VERSION	"1.0"
-
-static void __iomem *ltq_etop_membase;
-
-struct ltq_etop_chan {
-	int idx;
-	int tx_free;
-	struct net_device *netdev;
-	struct napi_struct napi;
-	struct ltq_dma_channel dma;
-	struct sk_buff *skb[LTQ_DESC_NUM];
-};
-
-struct ltq_etop_priv {
-	struct net_device *netdev;
-	struct platform_device *pdev;
-	struct ltq_eth_data *pldata;
-
-	struct mii_bus *mii_bus;
-
-	struct ltq_etop_chan ch[MAX_DMA_CHAN];
-
-	int tx_burst_len;
-	int rx_burst_len;
-
-	spinlock_t lock;
-};
-
-static int
-ltq_etop_alloc_skb(struct ltq_etop_chan *ch)
-{
-	struct ltq_etop_priv *priv = netdev_priv(ch->netdev);
-
-	ch->skb[ch->dma.desc] = netdev_alloc_skb(ch->netdev, MAX_DMA_DATA_LEN);
-	if (!ch->skb[ch->dma.desc])
-		return -ENOMEM;
-	ch->dma.desc_base[ch->dma.desc].addr =
-		dma_map_single(&priv->pdev->dev, ch->skb[ch->dma.desc]->data,
-			       MAX_DMA_DATA_LEN, DMA_FROM_DEVICE);
-	ch->dma.desc_base[ch->dma.desc].addr =
-		CPHYSADDR(ch->skb[ch->dma.desc]->data);
-	ch->dma.desc_base[ch->dma.desc].ctl =
-		LTQ_DMA_OWN | LTQ_DMA_RX_OFFSET(NET_IP_ALIGN) |
-		MAX_DMA_DATA_LEN;
-	skb_reserve(ch->skb[ch->dma.desc], NET_IP_ALIGN);
-	return 0;
-}
-
-static void
-ltq_etop_hw_receive(struct ltq_etop_chan *ch)
-{
-	struct ltq_etop_priv *priv = netdev_priv(ch->netdev);
-	struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
-	struct sk_buff *skb = ch->skb[ch->dma.desc];
-	int len = (desc->ctl & LTQ_DMA_SIZE_MASK) - MAX_DMA_CRC_LEN;
-	unsigned long flags;
-
-	spin_lock_irqsave(&priv->lock, flags);
-	if (ltq_etop_alloc_skb(ch)) {
-		netdev_err(ch->netdev,
-			   "failed to allocate new rx buffer, stopping DMA\n");
-		ltq_dma_close(&ch->dma);
-	}
-	ch->dma.desc++;
-	ch->dma.desc %= LTQ_DESC_NUM;
-	spin_unlock_irqrestore(&priv->lock, flags);
-
-	skb_put(skb, len);
-	skb->protocol = eth_type_trans(skb, ch->netdev);
-	netif_receive_skb(skb);
-}
-
-static int
-ltq_etop_poll_rx(struct napi_struct *napi, int budget)
-{
-	struct ltq_etop_chan *ch = container_of(napi,
-				struct ltq_etop_chan, napi);
-	int work_done = 0;
-
-	while (work_done < budget) {
-		struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
-
-		if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) != LTQ_DMA_C)
-			break;
-		ltq_etop_hw_receive(ch);
-		work_done++;
-	}
-	if (work_done < budget) {
-		napi_complete_done(&ch->napi, work_done);
-		ltq_dma_ack_irq(&ch->dma);
-	}
-	return work_done;
-}
-
-static int
-ltq_etop_poll_tx(struct napi_struct *napi, int budget)
-{
-	struct ltq_etop_chan *ch =
-		container_of(napi, struct ltq_etop_chan, napi);
-	struct ltq_etop_priv *priv = netdev_priv(ch->netdev);
-	struct netdev_queue *txq =
-		netdev_get_tx_queue(ch->netdev, ch->idx >> 1);
-	unsigned long flags;
-
-	spin_lock_irqsave(&priv->lock, flags);
-	while ((ch->dma.desc_base[ch->tx_free].ctl &
-			(LTQ_DMA_OWN | LTQ_DMA_C)) == LTQ_DMA_C) {
-		dev_kfree_skb_any(ch->skb[ch->tx_free]);
-		ch->skb[ch->tx_free] = NULL;
-		memset(&ch->dma.desc_base[ch->tx_free], 0,
-		       sizeof(struct ltq_dma_desc));
-		ch->tx_free++;
-		ch->tx_free %= LTQ_DESC_NUM;
-	}
-	spin_unlock_irqrestore(&priv->lock, flags);
-
-	if (netif_tx_queue_stopped(txq))
-		netif_tx_start_queue(txq);
-	napi_complete(&ch->napi);
-	ltq_dma_ack_irq(&ch->dma);
-	return 1;
-}
-
-static irqreturn_t
-ltq_etop_dma_irq(int irq, void *_priv)
-{
-	struct ltq_etop_priv *priv = _priv;
-	int ch = irq - LTQ_DMA_CH0_INT;
-
-	napi_schedule(&priv->ch[ch].napi);
-	return IRQ_HANDLED;
-}
-
-static void
-ltq_etop_free_channel(struct net_device *dev, struct ltq_etop_chan *ch)
-{
-	struct ltq_etop_priv *priv = netdev_priv(dev);
-
-	ltq_dma_free(&ch->dma);
-	if (ch->dma.irq)
-		free_irq(ch->dma.irq, priv);
-	if (IS_RX(ch->idx)) {
-		struct ltq_dma_channel *dma = &ch->dma;
-
-		for (dma->desc = 0; dma->desc < LTQ_DESC_NUM; dma->desc++)
-			dev_kfree_skb_any(ch->skb[ch->dma.desc]);
-	}
-}
-
-static void
-ltq_etop_hw_exit(struct net_device *dev)
-{
-	struct ltq_etop_priv *priv = netdev_priv(dev);
-	int i;
-
-	ltq_pmu_disable(PMU_PPE);
-	for (i = 0; i < MAX_DMA_CHAN; i++)
-		if (IS_TX(i) || IS_RX(i))
-			ltq_etop_free_channel(dev, &priv->ch[i]);
-}
-
-static int
-ltq_etop_hw_init(struct net_device *dev)
-{
-	struct ltq_etop_priv *priv = netdev_priv(dev);
-	int i;
-	int err;
-
-	ltq_pmu_enable(PMU_PPE);
-
-	switch (priv->pldata->mii_mode) {
-	case PHY_INTERFACE_MODE_RMII:
-		ltq_etop_w32_mask(ETOP_MII_MASK, ETOP_MII_REVERSE,
-				  LTQ_ETOP_CFG);
-		break;
-
-	case PHY_INTERFACE_MODE_MII:
-		ltq_etop_w32_mask(ETOP_MII_MASK, ETOP_MII_NORMAL,
-				  LTQ_ETOP_CFG);
-		break;
-
-	default:
-		netdev_err(dev, "unknown mii mode %d\n",
-			   priv->pldata->mii_mode);
-		return -ENOTSUPP;
-	}
-
-	/* enable crc generation */
-	ltq_etop_w32(PPE32_CGEN, LQ_PPE32_ENET_MAC_CFG);
-
-	ltq_dma_init_port(DMA_PORT_ETOP, priv->tx_burst_len, priv->rx_burst_len);
-
-	for (i = 0; i < MAX_DMA_CHAN; i++) {
-		int irq = LTQ_DMA_CH0_INT + i;
-		struct ltq_etop_chan *ch = &priv->ch[i];
-
-		ch->dma.nr = i;
-		ch->idx = ch->dma.nr;
-		ch->dma.dev = &priv->pdev->dev;
-
-		if (IS_TX(i)) {
-			ltq_dma_alloc_tx(&ch->dma);
-			err = request_irq(irq, ltq_etop_dma_irq, 0, "etop_tx", priv);
-			if (err) {
-				netdev_err(dev,
-					   "Unable to get Tx DMA IRQ %d\n",
-					   irq);
-				return err;
-			}
-		} else if (IS_RX(i)) {
-			ltq_dma_alloc_rx(&ch->dma);
-			for (ch->dma.desc = 0; ch->dma.desc < LTQ_DESC_NUM;
-					ch->dma.desc++)
-				if (ltq_etop_alloc_skb(ch))
-					return -ENOMEM;
-			ch->dma.desc = 0;
-			err = request_irq(irq, ltq_etop_dma_irq, 0, "etop_rx", priv);
-			if (err) {
-				netdev_err(dev,
-					   "Unable to get Rx DMA IRQ %d\n",
-					   irq);
-				return err;
-			}
-		}
-		ch->dma.irq = irq;
-	}
-	return 0;
-}
-
-static void
-ltq_etop_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
-{
-	strscpy(info->driver, "Lantiq ETOP", sizeof(info->driver));
-	strscpy(info->bus_info, "internal", sizeof(info->bus_info));
-	strscpy(info->version, DRV_VERSION, sizeof(info->version));
-}
-
-static const struct ethtool_ops ltq_etop_ethtool_ops = {
-	.get_drvinfo = ltq_etop_get_drvinfo,
-	.nway_reset = phy_ethtool_nway_reset,
-	.get_link_ksettings = phy_ethtool_get_link_ksettings,
-	.set_link_ksettings = phy_ethtool_set_link_ksettings,
-};
-
-static int
-ltq_etop_mdio_wr(struct mii_bus *bus, int phy_addr, int phy_reg, u16 phy_data)
-{
-	u32 val = MDIO_REQUEST |
-		((phy_addr & MDIO_ADDR_MASK) << MDIO_ADDR_OFFSET) |
-		((phy_reg & MDIO_REG_MASK) << MDIO_REG_OFFSET) |
-		phy_data;
-
-	while (ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_REQUEST)
-		;
-	ltq_etop_w32(val, LTQ_ETOP_MDIO);
-	return 0;
-}
-
-static int
-ltq_etop_mdio_rd(struct mii_bus *bus, int phy_addr, int phy_reg)
-{
-	u32 val = MDIO_REQUEST | MDIO_READ |
-		((phy_addr & MDIO_ADDR_MASK) << MDIO_ADDR_OFFSET) |
-		((phy_reg & MDIO_REG_MASK) << MDIO_REG_OFFSET);
-
-	while (ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_REQUEST)
-		;
-	ltq_etop_w32(val, LTQ_ETOP_MDIO);
-	while (ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_REQUEST)
-		;
-	val = ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_VAL_MASK;
-	return val;
-}
-
-static void
-ltq_etop_mdio_link(struct net_device *dev)
-{
-	/* nothing to do  */
-}
-
-static int
-ltq_etop_mdio_probe(struct net_device *dev)
-{
-	struct ltq_etop_priv *priv = netdev_priv(dev);
-	struct phy_device *phydev;
-
-	phydev = phy_find_first(priv->mii_bus);
-
-	if (!phydev) {
-		netdev_err(dev, "no PHY found\n");
-		return -ENODEV;
-	}
-
-	phydev = phy_connect(dev, phydev_name(phydev),
-			     &ltq_etop_mdio_link, priv->pldata->mii_mode);
-
-	if (IS_ERR(phydev)) {
-		netdev_err(dev, "Could not attach to PHY\n");
-		return PTR_ERR(phydev);
-	}
-
-	phy_set_max_speed(phydev, SPEED_100);
-
-	phy_attached_info(phydev);
-
-	return 0;
-}
-
-static int
-ltq_etop_mdio_init(struct net_device *dev)
-{
-	struct ltq_etop_priv *priv = netdev_priv(dev);
-	int err;
-
-	priv->mii_bus = mdiobus_alloc();
-	if (!priv->mii_bus) {
-		netdev_err(dev, "failed to allocate mii bus\n");
-		err = -ENOMEM;
-		goto err_out;
-	}
-
-	priv->mii_bus->priv = dev;
-	priv->mii_bus->read = ltq_etop_mdio_rd;
-	priv->mii_bus->write = ltq_etop_mdio_wr;
-	priv->mii_bus->name = "ltq_mii";
-	snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
-		 priv->pdev->name, priv->pdev->id);
-	if (mdiobus_register(priv->mii_bus)) {
-		err = -ENXIO;
-		goto err_out_free_mdiobus;
-	}
-
-	if (ltq_etop_mdio_probe(dev)) {
-		err = -ENXIO;
-		goto err_out_unregister_bus;
-	}
-	return 0;
-
-err_out_unregister_bus:
-	mdiobus_unregister(priv->mii_bus);
-err_out_free_mdiobus:
-	mdiobus_free(priv->mii_bus);
-err_out:
-	return err;
-}
-
-static void
-ltq_etop_mdio_cleanup(struct net_device *dev)
-{
-	struct ltq_etop_priv *priv = netdev_priv(dev);
-
-	phy_disconnect(dev->phydev);
-	mdiobus_unregister(priv->mii_bus);
-	mdiobus_free(priv->mii_bus);
-}
-
-static int
-ltq_etop_open(struct net_device *dev)
-{
-	struct ltq_etop_priv *priv = netdev_priv(dev);
-	int i;
-
-	for (i = 0; i < MAX_DMA_CHAN; i++) {
-		struct ltq_etop_chan *ch = &priv->ch[i];
-
-		if (!IS_TX(i) && (!IS_RX(i)))
-			continue;
-		ltq_dma_open(&ch->dma);
-		ltq_dma_enable_irq(&ch->dma);
-		napi_enable(&ch->napi);
-	}
-	phy_start(dev->phydev);
-	netif_tx_start_all_queues(dev);
-	return 0;
-}
-
-static int
-ltq_etop_stop(struct net_device *dev)
-{
-	struct ltq_etop_priv *priv = netdev_priv(dev);
-	int i;
-
-	netif_tx_stop_all_queues(dev);
-	phy_stop(dev->phydev);
-	for (i = 0; i < MAX_DMA_CHAN; i++) {
-		struct ltq_etop_chan *ch = &priv->ch[i];
-
-		if (!IS_RX(i) && !IS_TX(i))
-			continue;
-		napi_disable(&ch->napi);
-		ltq_dma_close(&ch->dma);
-	}
-	return 0;
-}
-
-static netdev_tx_t
-ltq_etop_tx(struct sk_buff *skb, struct net_device *dev)
-{
-	int queue = skb_get_queue_mapping(skb);
-	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue);
-	struct ltq_etop_priv *priv = netdev_priv(dev);
-	struct ltq_etop_chan *ch = &priv->ch[(queue << 1) | 1];
-	struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
-	int len;
-	unsigned long flags;
-	u32 byte_offset;
-
-	if (skb_put_padto(skb, ETH_ZLEN))
-		return NETDEV_TX_OK;
-	len = skb->len;
-
-	if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) || ch->skb[ch->dma.desc]) {
-		netdev_err(dev, "tx ring full\n");
-		netif_tx_stop_queue(txq);
-		return NETDEV_TX_BUSY;
-	}
-
-	/* dma needs to start on a burst length value aligned address */
-	byte_offset = CPHYSADDR(skb->data) % (priv->tx_burst_len * 4);
-	ch->skb[ch->dma.desc] = skb;
-
-	netif_trans_update(dev);
-
-	spin_lock_irqsave(&priv->lock, flags);
-	desc->addr = ((unsigned int)dma_map_single(&priv->pdev->dev, skb->data, len,
-						DMA_TO_DEVICE)) - byte_offset;
-	/* Make sure the address is written before we give it to HW */
-	wmb();
-	desc->ctl = LTQ_DMA_OWN | LTQ_DMA_SOP | LTQ_DMA_EOP |
-		LTQ_DMA_TX_OFFSET(byte_offset) | (len & LTQ_DMA_SIZE_MASK);
-	ch->dma.desc++;
-	ch->dma.desc %= LTQ_DESC_NUM;
-	spin_unlock_irqrestore(&priv->lock, flags);
-
-	if (ch->dma.desc_base[ch->dma.desc].ctl & LTQ_DMA_OWN)
-		netif_tx_stop_queue(txq);
-
-	return NETDEV_TX_OK;
-}
-
-static int
-ltq_etop_change_mtu(struct net_device *dev, int new_mtu)
-{
-	struct ltq_etop_priv *priv = netdev_priv(dev);
-	unsigned long flags;
-
-	WRITE_ONCE(dev->mtu, new_mtu);
-
-	spin_lock_irqsave(&priv->lock, flags);
-	ltq_etop_w32((ETOP_PLEN_UNDER << 16) | new_mtu, LTQ_ETOP_IGPLEN);
-	spin_unlock_irqrestore(&priv->lock, flags);
-
-	return 0;
-}
-
-static int
-ltq_etop_set_mac_address(struct net_device *dev, void *p)
-{
-	int ret = eth_mac_addr(dev, p);
-
-	if (!ret) {
-		struct ltq_etop_priv *priv = netdev_priv(dev);
-		unsigned long flags;
-
-		/* store the mac for the unicast filter */
-		spin_lock_irqsave(&priv->lock, flags);
-		ltq_etop_w32(*((u32 *)dev->dev_addr), LTQ_ETOP_MAC_DA0);
-		ltq_etop_w32(*((u16 *)&dev->dev_addr[4]) << 16,
-			     LTQ_ETOP_MAC_DA1);
-		spin_unlock_irqrestore(&priv->lock, flags);
-	}
-	return ret;
-}
-
-static void
-ltq_etop_set_multicast_list(struct net_device *dev)
-{
-	struct ltq_etop_priv *priv = netdev_priv(dev);
-	unsigned long flags;
-
-	/* ensure that the unicast filter is not enabled in promiscious mode */
-	spin_lock_irqsave(&priv->lock, flags);
-	if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI))
-		ltq_etop_w32_mask(ETOP_FTCU, 0, LTQ_ETOP_ENETS0);
-	else
-		ltq_etop_w32_mask(0, ETOP_FTCU, LTQ_ETOP_ENETS0);
-	spin_unlock_irqrestore(&priv->lock, flags);
-}
-
-static int
-ltq_etop_init(struct net_device *dev)
-{
-	struct ltq_etop_priv *priv = netdev_priv(dev);
-	struct sockaddr mac;
-	int err;
-	bool random_mac = false;
-
-	dev->watchdog_timeo = 10 * HZ;
-	err = ltq_etop_hw_init(dev);
-	if (err)
-		goto err_hw;
-	ltq_etop_change_mtu(dev, 1500);
-
-	memcpy(&mac, &priv->pldata->mac, sizeof(struct sockaddr));
-	if (!is_valid_ether_addr(mac.sa_data)) {
-		pr_warn("etop: invalid MAC, using random\n");
-		eth_random_addr(mac.sa_data);
-		random_mac = true;
-	}
-
-	err = ltq_etop_set_mac_address(dev, &mac);
-	if (err)
-		goto err_netdev;
-
-	/* Set addr_assign_type here, ltq_etop_set_mac_address would reset it. */
-	if (random_mac)
-		dev->addr_assign_type = NET_ADDR_RANDOM;
-
-	ltq_etop_set_multicast_list(dev);
-	err = ltq_etop_mdio_init(dev);
-	if (err)
-		goto err_netdev;
-	return 0;
-
-err_netdev:
-	unregister_netdev(dev);
-	free_netdev(dev);
-err_hw:
-	ltq_etop_hw_exit(dev);
-	return err;
-}
-
-static void
-ltq_etop_tx_timeout(struct net_device *dev, unsigned int txqueue)
-{
-	int err;
-
-	ltq_etop_hw_exit(dev);
-	err = ltq_etop_hw_init(dev);
-	if (err)
-		goto err_hw;
-	netif_trans_update(dev);
-	netif_wake_queue(dev);
-	return;
-
-err_hw:
-	ltq_etop_hw_exit(dev);
-	netdev_err(dev, "failed to restart etop after TX timeout\n");
-}
-
-static const struct net_device_ops ltq_eth_netdev_ops = {
-	.ndo_open = ltq_etop_open,
-	.ndo_stop = ltq_etop_stop,
-	.ndo_start_xmit = ltq_etop_tx,
-	.ndo_change_mtu = ltq_etop_change_mtu,
-	.ndo_eth_ioctl = phy_do_ioctl,
-	.ndo_set_mac_address = ltq_etop_set_mac_address,
-	.ndo_validate_addr = eth_validate_addr,
-	.ndo_set_rx_mode = ltq_etop_set_multicast_list,
-	.ndo_select_queue = dev_pick_tx_zero,
-	.ndo_init = ltq_etop_init,
-	.ndo_tx_timeout = ltq_etop_tx_timeout,
-};
-
-static int __init
-ltq_etop_probe(struct platform_device *pdev)
-{
-	struct net_device *dev;
-	struct ltq_etop_priv *priv;
-	int err;
-	int i;
-
-	ltq_etop_membase = devm_platform_ioremap_resource(pdev, 0);
-	if (IS_ERR(ltq_etop_membase)) {
-		dev_err(&pdev->dev, "failed to remap etop engine %d\n",
-			pdev->id);
-		err = PTR_ERR(ltq_etop_membase);
-		goto err_out;
-	}
-
-	dev = alloc_etherdev_mq(sizeof(struct ltq_etop_priv), 4);
-	if (!dev) {
-		err = -ENOMEM;
-		goto err_out;
-	}
-	dev->netdev_ops = &ltq_eth_netdev_ops;
-	dev->ethtool_ops = &ltq_etop_ethtool_ops;
-	priv = netdev_priv(dev);
-	priv->pdev = pdev;
-	priv->pldata = dev_get_platdata(&pdev->dev);
-	priv->netdev = dev;
-	spin_lock_init(&priv->lock);
-	SET_NETDEV_DEV(dev, &pdev->dev);
-
-	err = device_property_read_u32(&pdev->dev, "lantiq,tx-burst-length", &priv->tx_burst_len);
-	if (err < 0) {
-		dev_err(&pdev->dev, "unable to read tx-burst-length property\n");
-		goto err_free;
-	}
-
-	err = device_property_read_u32(&pdev->dev, "lantiq,rx-burst-length", &priv->rx_burst_len);
-	if (err < 0) {
-		dev_err(&pdev->dev, "unable to read rx-burst-length property\n");
-		goto err_free;
-	}
-
-	for (i = 0; i < MAX_DMA_CHAN; i++) {
-		if (IS_TX(i))
-			netif_napi_add_weight(dev, &priv->ch[i].napi,
-					      ltq_etop_poll_tx, 8);
-		else if (IS_RX(i))
-			netif_napi_add_weight(dev, &priv->ch[i].napi,
-					      ltq_etop_poll_rx, 32);
-		priv->ch[i].netdev = dev;
-	}
-
-	err = register_netdev(dev);
-	if (err)
-		goto err_free;
-
-	platform_set_drvdata(pdev, dev);
-	return 0;
-
-err_free:
-	free_netdev(dev);
-err_out:
-	return err;
-}
-
-static void ltq_etop_remove(struct platform_device *pdev)
-{
-	struct net_device *dev = platform_get_drvdata(pdev);
-
-	if (dev) {
-		netif_tx_stop_all_queues(dev);
-		ltq_etop_hw_exit(dev);
-		ltq_etop_mdio_cleanup(dev);
-		unregister_netdev(dev);
-	}
-}
-
-static struct platform_driver ltq_mii_driver = {
-	.remove = ltq_etop_remove,
-	.driver = {
-		.name = "ltq_etop",
-	},
-};
-
-static int __init
-init_ltq_etop(void)
-{
-	int ret = platform_driver_probe(&ltq_mii_driver, ltq_etop_probe);
-
-	if (ret)
-		pr_err("ltq_etop: Error registering platform driver!");
-	return ret;
-}
-
-static void __exit
-exit_ltq_etop(void)
-{
-	platform_driver_unregister(&ltq_mii_driver);
-}
-
-module_init(init_ltq_etop);
-module_exit(exit_ltq_etop);
-
-MODULE_AUTHOR("John Crispin <blogic@...nwrt.org>");
-MODULE_DESCRIPTION("Lantiq SoC ETOP");
-MODULE_LICENSE("GPL");
-- 
2.52.0

Powered by blists - more mailing lists