Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2064 insertions, 0 deletions

diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
new file mode 100644
index 0000000000..9135b918dd
--- /dev/null
+++ b/drivers/net/ethernet/faraday/ftgmac100.c
@@ -0,0 +1,2064 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Faraday FTGMAC100 Gigabit Ethernet
+ *
+ * (C) Copyright 2009-2011 Faraday Technology
+ * Po-Yu Chuang <ratbert@faraday-tech.com>
+ */
+
+#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
+
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/of.h>
+#include <linux/of_mdio.h>
+#include <linux/phy.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/crc32.h>
+#include <linux/if_vlan.h>
+#include <linux/of_net.h>
+#include <net/ip.h>
+#include <net/ncsi.h>
+
+#include "ftgmac100.h"
+
+#define DRV_NAME	"ftgmac100"
+
+/* Arbitrary values, I am not sure the HW has limits */
+#define MAX_RX_QUEUE_ENTRIES	1024
+#define MAX_TX_QUEUE_ENTRIES	1024
+#define MIN_RX_QUEUE_ENTRIES	32
+#define MIN_TX_QUEUE_ENTRIES	32
+
+/* Defaults */
+#define DEF_RX_QUEUE_ENTRIES	128
+#define DEF_TX_QUEUE_ENTRIES	128
+
+#define MAX_PKT_SIZE		1536
+#define RX_BUF_SIZE		MAX_PKT_SIZE	/* must be smaller than 0x3fff */
+
+/* Min number of tx ring entries before stopping queue */
+#define TX_THRESHOLD		(MAX_SKB_FRAGS + 1)
+
+#define FTGMAC_100MHZ		100000000
+#define FTGMAC_25MHZ		25000000
+
+struct ftgmac100 {
+	/* Registers */
+	struct resource *res;
+	void __iomem *base;
+
+	/* Rx ring */
+	unsigned int rx_q_entries;
+	struct ftgmac100_rxdes *rxdes;
+	dma_addr_t rxdes_dma;
+	struct sk_buff **rx_skbs;
+	unsigned int rx_pointer;
+	u32 rxdes0_edorr_mask;
+
+	/* Tx ring */
+	unsigned int tx_q_entries;
+	struct ftgmac100_txdes *txdes;
+	dma_addr_t txdes_dma;
+	struct sk_buff **tx_skbs;
+	unsigned int tx_clean_pointer;
+	unsigned int tx_pointer;
+	u32 txdes0_edotr_mask;
+
+	/* Used to signal the reset task of ring change request */
+	unsigned int new_rx_q_entries;
+	unsigned int new_tx_q_entries;
+
+	/* Scratch page to use when rx skb alloc fails */
+	void *rx_scratch;
+	dma_addr_t rx_scratch_dma;
+
+	/* Component structures */
+	struct net_device *netdev;
+	struct device *dev;
+	struct ncsi_dev *ndev;
+	struct napi_struct napi;
+	struct work_struct reset_task;
+	struct mii_bus *mii_bus;
+	struct clk *clk;
+
+	/* AST2500/AST2600 RMII ref clock gate */
+	struct clk *rclk;
+
+	/* Link management */
+	int cur_speed;
+	int cur_duplex;
+	bool use_ncsi;
+
+	/* Multicast filter settings */
+	u32 maht0;
+	u32 maht1;
+
+	/* Flow control settings */
+	bool tx_pause;
+	bool rx_pause;
+	bool aneg_pause;
+
+	/* Misc */
+	bool need_mac_restart;
+	bool is_aspeed;
+};
+
+static int ftgmac100_reset_mac(struct ftgmac100 *priv, u32 maccr)
+{
+	struct net_device *netdev = priv->netdev;
+	int i;
+
+	/* NOTE: reset clears all registers */
+	iowrite32(maccr, priv->base + FTGMAC100_OFFSET_MACCR);
+	iowrite32(maccr | FTGMAC100_MACCR_SW_RST,
+		  priv->base + FTGMAC100_OFFSET_MACCR);
+	for (i = 0; i < 200; i++) {
+		unsigned int maccr;
+
+		maccr = ioread32(priv->base + FTGMAC100_OFFSET_MACCR);
+		if (!(maccr & FTGMAC100_MACCR_SW_RST))
+			return 0;
+
+		udelay(1);
+	}
+
+	netdev_err(netdev, "Hardware reset failed\n");
+	return -EIO;
+}
+
+static int ftgmac100_reset_and_config_mac(struct ftgmac100 *priv)
+{
+	u32 maccr = 0;
+
+	switch (priv->cur_speed) {
+	case SPEED_10:
+	case 0: /* no link */
+		break;
+
+	case SPEED_100:
+		maccr |= FTGMAC100_MACCR_FAST_MODE;
+		break;
+
+	case SPEED_1000:
+		maccr |= FTGMAC100_MACCR_GIGA_MODE;
+		break;
+	default:
+		netdev_err(priv->netdev, "Unknown speed %d !\n",
+			   priv->cur_speed);
+		break;
+	}
+
+	/* (Re)initialize the queue pointers */
+	priv->rx_pointer = 0;
+	priv->tx_clean_pointer = 0;
+	priv->tx_pointer = 0;
+
+	/* The doc says reset twice with 10us interval */
+	if (ftgmac100_reset_mac(priv, maccr))
+		return -EIO;
+	usleep_range(10, 1000);
+	return ftgmac100_reset_mac(priv, maccr);
+}
+
+static void ftgmac100_write_mac_addr(struct ftgmac100 *priv, const u8 *mac)
+{
+	unsigned int maddr = mac[0] << 8 | mac[1];
+	unsigned int laddr = mac[2] << 24 | mac[3] << 16 | mac[4] << 8 | mac[5];
+
+	iowrite32(maddr, priv->base + FTGMAC100_OFFSET_MAC_MADR);
+	iowrite32(laddr, priv->base + FTGMAC100_OFFSET_MAC_LADR);
+}
+
+static int ftgmac100_initial_mac(struct ftgmac100 *priv)
+{
+	u8 mac[ETH_ALEN];
+	unsigned int m;
+	unsigned int l;
+	int err;
+
+	err = of_get_ethdev_address(priv->dev->of_node, priv->netdev);
+	if (err == -EPROBE_DEFER)
+		return err;
+	if (!err) {
+		dev_info(priv->dev, "Read MAC address %pM from device tree\n",
+			 priv->netdev->dev_addr);
+		return 0;
+	}
+
+	m = ioread32(priv->base + FTGMAC100_OFFSET_MAC_MADR);
+	l = ioread32(priv->base + FTGMAC100_OFFSET_MAC_LADR);
+
+	mac[0] = (m >> 8) & 0xff;
+	mac[1] = m & 0xff;
+	mac[2] = (l >> 24) & 0xff;
+	mac[3] = (l >> 16) & 0xff;
+	mac[4] = (l >> 8) & 0xff;
+	mac[5] = l & 0xff;
+
+	if (is_valid_ether_addr(mac)) {
+		eth_hw_addr_set(priv->netdev, mac);
+		dev_info(priv->dev, "Read MAC address %pM from chip\n", mac);
+	} else {
+		eth_hw_addr_random(priv->netdev);
+		dev_info(priv->dev, "Generated random MAC address %pM\n",
+			 priv->netdev->dev_addr);
+	}
+
+	return 0;
+}
+
+static int ftgmac100_set_mac_addr(struct net_device *dev, void *p)
+{
+	int ret;
+
+	ret = eth_prepare_mac_addr_change(dev, p);
+	if (ret < 0)
+		return ret;
+
+	eth_commit_mac_addr_change(dev, p);
+	ftgmac100_write_mac_addr(netdev_priv(dev), dev->dev_addr);
+
+	return 0;
+}
+
+static void ftgmac100_config_pause(struct ftgmac100 *priv)
+{
+	u32 fcr = FTGMAC100_FCR_PAUSE_TIME(16);
+
+	/* Throttle tx queue when receiving pause frames */
+	if (priv->rx_pause)
+		fcr |= FTGMAC100_FCR_FC_EN;
+
+	/* Enables sending pause frames when the RX queue is past a
+	 * certain threshold.
+	 */
+	if (priv->tx_pause)
+		fcr |= FTGMAC100_FCR_FCTHR_EN;
+
+	iowrite32(fcr, priv->base + FTGMAC100_OFFSET_FCR);
+}
+
+static void ftgmac100_init_hw(struct ftgmac100 *priv)
+{
+	u32 reg, rfifo_sz, tfifo_sz;
+
+	/* Clear stale interrupts */
+	reg = ioread32(priv->base + FTGMAC100_OFFSET_ISR);
+	iowrite32(reg, priv->base + FTGMAC100_OFFSET_ISR);
+
+	/* Setup RX ring buffer base */
+	iowrite32(priv->rxdes_dma, priv->base + FTGMAC100_OFFSET_RXR_BADR);
+
+	/* Setup TX ring buffer base */
+	iowrite32(priv->txdes_dma, priv->base + FTGMAC100_OFFSET_NPTXR_BADR);
+
+	/* Configure RX buffer size */
+	iowrite32(FTGMAC100_RBSR_SIZE(RX_BUF_SIZE),
+		  priv->base + FTGMAC100_OFFSET_RBSR);
+
+	/* Set RX descriptor autopoll */
+	iowrite32(FTGMAC100_APTC_RXPOLL_CNT(1),
+		  priv->base + FTGMAC100_OFFSET_APTC);
+
+	/* Write MAC address */
+	ftgmac100_write_mac_addr(priv, priv->netdev->dev_addr);
+
+	/* Write multicast filter */
+	iowrite32(priv->maht0, priv->base + FTGMAC100_OFFSET_MAHT0);
+	iowrite32(priv->maht1, priv->base + FTGMAC100_OFFSET_MAHT1);
+
+	/* Configure descriptor sizes and increase burst sizes according
+	 * to values in Aspeed SDK. The FIFO arbitration is enabled and
+	 * the thresholds set based on the recommended values in the
+	 * AST2400 specification.
+	 */
+	iowrite32(FTGMAC100_DBLAC_RXDES_SIZE(2) |   /* 2*8 bytes RX descs */
+		  FTGMAC100_DBLAC_TXDES_SIZE(2) |   /* 2*8 bytes TX descs */
+		  FTGMAC100_DBLAC_RXBURST_SIZE(3) | /* 512 bytes max RX bursts */
+		  FTGMAC100_DBLAC_TXBURST_SIZE(3) | /* 512 bytes max TX bursts */
+		  FTGMAC100_DBLAC_RX_THR_EN |       /* Enable fifo threshold arb */
+		  FTGMAC100_DBLAC_RXFIFO_HTHR(6) |  /* 6/8 of FIFO high threshold */
+		  FTGMAC100_DBLAC_RXFIFO_LTHR(2),   /* 2/8 of FIFO low threshold */
+		  priv->base + FTGMAC100_OFFSET_DBLAC);
+
+	/* Interrupt mitigation configured for 1 interrupt/packet. HW interrupt
+	 * mitigation doesn't seem to provide any benefit with NAPI so leave
+	 * it at that.
+	 */
+	iowrite32(FTGMAC100_ITC_RXINT_THR(1) |
+		  FTGMAC100_ITC_TXINT_THR(1),
+		  priv->base + FTGMAC100_OFFSET_ITC);
+
+	/* Configure FIFO sizes in the TPAFCR register */
+	reg = ioread32(priv->base + FTGMAC100_OFFSET_FEAR);
+	rfifo_sz = reg & 0x00000007;
+	tfifo_sz = (reg >> 3) & 0x00000007;
+	reg = ioread32(priv->base + FTGMAC100_OFFSET_TPAFCR);
+	reg &= ~0x3f000000;
+	reg |= (tfifo_sz << 27);
+	reg |= (rfifo_sz << 24);
+	iowrite32(reg, priv->base + FTGMAC100_OFFSET_TPAFCR);
+}
+
+static void ftgmac100_start_hw(struct ftgmac100 *priv)
+{
+	u32 maccr = ioread32(priv->base + FTGMAC100_OFFSET_MACCR);
+
+	/* Keep the original GMAC and FAST bits */
+	maccr &= (FTGMAC100_MACCR_FAST_MODE | FTGMAC100_MACCR_GIGA_MODE);
+
+	/* Add all the main enable bits */
+	maccr |= FTGMAC100_MACCR_TXDMA_EN	|
+		 FTGMAC100_MACCR_RXDMA_EN	|
+		 FTGMAC100_MACCR_TXMAC_EN	|
+		 FTGMAC100_MACCR_RXMAC_EN	|
+		 FTGMAC100_MACCR_CRC_APD	|
+		 FTGMAC100_MACCR_PHY_LINK_LEVEL	|
+		 FTGMAC100_MACCR_RX_RUNT	|
+		 FTGMAC100_MACCR_RX_BROADPKT;
+
+	/* Add other bits as needed */
+	if (priv->cur_duplex == DUPLEX_FULL)
+		maccr |= FTGMAC100_MACCR_FULLDUP;
+	if (priv->netdev->flags & IFF_PROMISC)
+		maccr |= FTGMAC100_MACCR_RX_ALL;
+	if (priv->netdev->flags & IFF_ALLMULTI)
+		maccr |= FTGMAC100_MACCR_RX_MULTIPKT;
+	else if (netdev_mc_count(priv->netdev))
+		maccr |= FTGMAC100_MACCR_HT_MULTI_EN;
+
+	/* Vlan filtering enabled */
+	if (priv->netdev->features & NETIF_F_HW_VLAN_CTAG_RX)
+		maccr |= FTGMAC100_MACCR_RM_VLAN;
+
+	/* Hit the HW */
+	iowrite32(maccr, priv->base + FTGMAC100_OFFSET_MACCR);
+}
+
+static void ftgmac100_stop_hw(struct ftgmac100 *priv)
+{
+	iowrite32(0, priv->base + FTGMAC100_OFFSET_MACCR);
+}
+
+static void ftgmac100_calc_mc_hash(struct ftgmac100 *priv)
+{
+	struct netdev_hw_addr *ha;
+
+	priv->maht1 = 0;
+	priv->maht0 = 0;
+	netdev_for_each_mc_addr(ha, priv->netdev) {
+		u32 crc_val = ether_crc_le(ETH_ALEN, ha->addr);
+
+		crc_val = (~(crc_val >> 2)) & 0x3f;
+		if (crc_val >= 32)
+			priv->maht1 |= 1ul << (crc_val - 32);
+		else
+			priv->maht0 |= 1ul << (crc_val);
+	}
+}
+
+static void ftgmac100_set_rx_mode(struct net_device *netdev)
+{
+	struct ftgmac100 *priv = netdev_priv(netdev);
+
+	/* Setup the hash filter */
+	ftgmac100_calc_mc_hash(priv);
+
+	/* Interface down ? that's all there is to do */
+	if (!netif_running(netdev))
+		return;
+
+	/* Update the HW */
+	iowrite32(priv->maht0, priv->base + FTGMAC100_OFFSET_MAHT0);
+	iowrite32(priv->maht1, priv->base + FTGMAC100_OFFSET_MAHT1);
+
+	/* Reconfigure MACCR */
+	ftgmac100_start_hw(priv);
+}
+
+static int ftgmac100_alloc_rx_buf(struct ftgmac100 *priv, unsigned int entry,
+				  struct ftgmac100_rxdes *rxdes, gfp_t gfp)
+{
+	struct net_device *netdev = priv->netdev;
+	struct sk_buff *skb;
+	dma_addr_t map;
+	int err = 0;
+
+	skb = netdev_alloc_skb_ip_align(netdev, RX_BUF_SIZE);
+	if (unlikely(!skb)) {
+		if (net_ratelimit())
+			netdev_warn(netdev, "failed to allocate rx skb\n");
+		err = -ENOMEM;
+		map = priv->rx_scratch_dma;
+	} else {
+		map = dma_map_single(priv->dev, skb->data, RX_BUF_SIZE,
+				     DMA_FROM_DEVICE);
+		if (unlikely(dma_mapping_error(priv->dev, map))) {
+			if (net_ratelimit())
+				netdev_err(netdev, "failed to map rx page\n");
+			dev_kfree_skb_any(skb);
+			map = priv->rx_scratch_dma;
+			skb = NULL;
+			err = -ENOMEM;
+		}
+	}
+
+	/* Store skb */
+	priv->rx_skbs[entry] = skb;
+
+	/* Store DMA address into RX desc */
+	rxdes->rxdes3 = cpu_to_le32(map);
+
+	/* Ensure the above is ordered vs clearing the OWN bit */
+	dma_wmb();
+
+	/* Clean status (which resets own bit) */
+	if (entry == (priv->rx_q_entries - 1))
+		rxdes->rxdes0 = cpu_to_le32(priv->rxdes0_edorr_mask);
+	else
+		rxdes->rxdes0 = 0;
+
+	return err;
+}
+
+static unsigned int ftgmac100_next_rx_pointer(struct ftgmac100 *priv,
+					      unsigned int pointer)
+{
+	return (pointer + 1) & (priv->rx_q_entries - 1);
+}
+
+static void ftgmac100_rx_packet_error(struct ftgmac100 *priv, u32 status)
+{
+	struct net_device *netdev = priv->netdev;
+
+	if (status & FTGMAC100_RXDES0_RX_ERR)
+		netdev->stats.rx_errors++;
+
+	if (status & FTGMAC100_RXDES0_CRC_ERR)
+		netdev->stats.rx_crc_errors++;
+
+	if (status & (FTGMAC100_RXDES0_FTL |
+		      FTGMAC100_RXDES0_RUNT |
+		      FTGMAC100_RXDES0_RX_ODD_NB))
+		netdev->stats.rx_length_errors++;
+}
+
+static bool ftgmac100_rx_packet(struct ftgmac100 *priv, int *processed)
+{
+	struct net_device *netdev = priv->netdev;
+	struct ftgmac100_rxdes *rxdes;
+	struct sk_buff *skb;
+	unsigned int pointer, size;
+	u32 status, csum_vlan;
+	dma_addr_t map;
+
+	/* Grab next RX descriptor */
+	pointer = priv->rx_pointer;
+	rxdes = &priv->rxdes[pointer];
+
+	/* Grab descriptor status */
+	status = le32_to_cpu(rxdes->rxdes0);
+
+	/* Do we have a packet ? */
+	if (!(status & FTGMAC100_RXDES0_RXPKT_RDY))
+		return false;
+
+	/* Order subsequent reads with the test for the ready bit */
+	dma_rmb();
+
+	/* We don't cope with fragmented RX packets */
+	if (unlikely(!(status & FTGMAC100_RXDES0_FRS) ||
+		     !(status & FTGMAC100_RXDES0_LRS)))
+		goto drop;
+
+	/* Grab received size and csum vlan field in the descriptor */
+	size = status & FTGMAC100_RXDES0_VDBC;
+	csum_vlan = le32_to_cpu(rxdes->rxdes1);
+
+	/* Any error (other than csum offload) flagged ? */
+	if (unlikely(status & RXDES0_ANY_ERROR)) {
+		/* Correct for incorrect flagging of runt packets
+		 * with vlan tags... Just accept a runt packet that
+		 * has been flagged as vlan and whose size is at
+		 * least 60 bytes.
+		 */
+		if ((status & FTGMAC100_RXDES0_RUNT) &&
+		    (csum_vlan & FTGMAC100_RXDES1_VLANTAG_AVAIL) &&
+		    (size >= 60))
+			status &= ~FTGMAC100_RXDES0_RUNT;
+
+		/* Any error still in there ? */
+		if (status & RXDES0_ANY_ERROR) {
+			ftgmac100_rx_packet_error(priv, status);
+			goto drop;
+		}
+	}
+
+	/* If the packet had no skb (failed to allocate earlier)
+	 * then try to allocate one and skip
+	 */
+	skb = priv->rx_skbs[pointer];
+	if (!unlikely(skb)) {
+		ftgmac100_alloc_rx_buf(priv, pointer, rxdes, GFP_ATOMIC);
+		goto drop;
+	}
+
+	if (unlikely(status & FTGMAC100_RXDES0_MULTICAST))
+		netdev->stats.multicast++;
+
+	/* If the HW found checksum errors, bounce it to software.
+	 *
+	 * If we didn't, we need to see if the packet was recognized
+	 * by HW as one of the supported checksummed protocols before
+	 * we accept the HW test results.
+	 */
+	if (netdev->features & NETIF_F_RXCSUM) {
+		u32 err_bits = FTGMAC100_RXDES1_TCP_CHKSUM_ERR |
+			FTGMAC100_RXDES1_UDP_CHKSUM_ERR |
+			FTGMAC100_RXDES1_IP_CHKSUM_ERR;
+		if ((csum_vlan & err_bits) ||
+		    !(csum_vlan & FTGMAC100_RXDES1_PROT_MASK))
+			skb->ip_summed = CHECKSUM_NONE;
+		else
+			skb->ip_summed = CHECKSUM_UNNECESSARY;
+	}
+
+	/* Transfer received size to skb */
+	skb_put(skb, size);
+
+	/* Extract vlan tag */
+	if ((netdev->features & NETIF_F_HW_VLAN_CTAG_RX) &&
+	    (csum_vlan & FTGMAC100_RXDES1_VLANTAG_AVAIL))
+		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
+				       csum_vlan & 0xffff);
+
+	/* Tear down DMA mapping, do necessary cache management */
+	map = le32_to_cpu(rxdes->rxdes3);
+
+#if defined(CONFIG_ARM) && !defined(CONFIG_ARM_DMA_USE_IOMMU)
+	/* When we don't have an iommu, we can save cycles by not
+	 * invalidating the cache for the part of the packet that
+	 * wasn't received.
+	 */
+	dma_unmap_single(priv->dev, map, size, DMA_FROM_DEVICE);
+#else
+	dma_unmap_single(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE);
+#endif
+
+
+	/* Resplenish rx ring */
+	ftgmac100_alloc_rx_buf(priv, pointer, rxdes, GFP_ATOMIC);
+	priv->rx_pointer = ftgmac100_next_rx_pointer(priv, pointer);
+
+	skb->protocol = eth_type_trans(skb, netdev);
+
+	netdev->stats.rx_packets++;
+	netdev->stats.rx_bytes += size;
+
+	/* push packet to protocol stack */
+	if (skb->ip_summed == CHECKSUM_NONE)
+		netif_receive_skb(skb);
+	else
+		napi_gro_receive(&priv->napi, skb);
+
+	(*processed)++;
+	return true;
+
+ drop:
+	/* Clean rxdes0 (which resets own bit) */
+	rxdes->rxdes0 = cpu_to_le32(status & priv->rxdes0_edorr_mask);
+	priv->rx_pointer = ftgmac100_next_rx_pointer(priv, pointer);
+	netdev->stats.rx_dropped++;
+	return true;
+}
+
+static u32 ftgmac100_base_tx_ctlstat(struct ftgmac100 *priv,
+				     unsigned int index)
+{
+	if (index == (priv->tx_q_entries - 1))
+		return priv->txdes0_edotr_mask;
+	else
+		return 0;
+}
+
+static unsigned int ftgmac100_next_tx_pointer(struct ftgmac100 *priv,
+					      unsigned int pointer)
+{
+	return (pointer + 1) & (priv->tx_q_entries - 1);
+}
+
+static u32 ftgmac100_tx_buf_avail(struct ftgmac100 *priv)
+{
+	/* Returns the number of available slots in the TX queue
+	 *
+	 * This always leaves one free slot so we don't have to
+	 * worry about empty vs. full, and this simplifies the
+	 * test for ftgmac100_tx_buf_cleanable() below
+	 */
+	return (priv->tx_clean_pointer - priv->tx_pointer - 1) &
+		(priv->tx_q_entries - 1);
+}
+
+static bool ftgmac100_tx_buf_cleanable(struct ftgmac100 *priv)
+{
+	return priv->tx_pointer != priv->tx_clean_pointer;
+}
+
+static void ftgmac100_free_tx_packet(struct ftgmac100 *priv,
+				     unsigned int pointer,
+				     struct sk_buff *skb,
+				     struct ftgmac100_txdes *txdes,
+				     u32 ctl_stat)
+{
+	dma_addr_t map = le32_to_cpu(txdes->txdes3);
+	size_t len;
+
+	if (ctl_stat & FTGMAC100_TXDES0_FTS) {
+		len = skb_headlen(skb);
+		dma_unmap_single(priv->dev, map, len, DMA_TO_DEVICE);
+	} else {
+		len = FTGMAC100_TXDES0_TXBUF_SIZE(ctl_stat);
+		dma_unmap_page(priv->dev, map, len, DMA_TO_DEVICE);
+	}
+
+	/* Free SKB on last segment */
+	if (ctl_stat & FTGMAC100_TXDES0_LTS)
+		dev_kfree_skb(skb);
+	priv->tx_skbs[pointer] = NULL;
+}
+
+static bool ftgmac100_tx_complete_packet(struct ftgmac100 *priv)
+{
+	struct net_device *netdev = priv->netdev;
+	struct ftgmac100_txdes *txdes;
+	struct sk_buff *skb;
+	unsigned int pointer;
+	u32 ctl_stat;
+
+	pointer = priv->tx_clean_pointer;
+	txdes = &priv->txdes[pointer];
+
+	ctl_stat = le32_to_cpu(txdes->txdes0);
+	if (ctl_stat & FTGMAC100_TXDES0_TXDMA_OWN)
+		return false;
+
+	skb = priv->tx_skbs[pointer];
+	netdev->stats.tx_packets++;
+	netdev->stats.tx_bytes += skb->len;
+	ftgmac100_free_tx_packet(priv, pointer, skb, txdes, ctl_stat);
+	txdes->txdes0 = cpu_to_le32(ctl_stat & priv->txdes0_edotr_mask);
+
+	priv->tx_clean_pointer = ftgmac100_next_tx_pointer(priv, pointer);
+
+	return true;
+}
+
+static void ftgmac100_tx_complete(struct ftgmac100 *priv)
+{
+	struct net_device *netdev = priv->netdev;
+
+	/* Process all completed packets */
+	while (ftgmac100_tx_buf_cleanable(priv) &&
+	       ftgmac100_tx_complete_packet(priv))
+		;
+
+	/* Restart queue if needed */
+	smp_mb();
+	if (unlikely(netif_queue_stopped(netdev) &&
+		     ftgmac100_tx_buf_avail(priv) >= TX_THRESHOLD)) {
+		struct netdev_queue *txq;
+
+		txq = netdev_get_tx_queue(netdev, 0);
+		__netif_tx_lock(txq, smp_processor_id());
+		if (netif_queue_stopped(netdev) &&
+		    ftgmac100_tx_buf_avail(priv) >= TX_THRESHOLD)
+			netif_wake_queue(netdev);
+		__netif_tx_unlock(txq);
+	}
+}
+
+static bool ftgmac100_prep_tx_csum(struct sk_buff *skb, u32 *csum_vlan)
+{
+	if (skb->protocol == cpu_to_be16(ETH_P_IP)) {
+		u8 ip_proto = ip_hdr(skb)->protocol;
+
+		*csum_vlan |= FTGMAC100_TXDES1_IP_CHKSUM;
+		switch(ip_proto) {
+		case IPPROTO_TCP:
+			*csum_vlan |= FTGMAC100_TXDES1_TCP_CHKSUM;
+			return true;
+		case IPPROTO_UDP:
+			*csum_vlan |= FTGMAC100_TXDES1_UDP_CHKSUM;
+			return true;
+		case IPPROTO_IP:
+			return true;
+		}
+	}
+	return skb_checksum_help(skb) == 0;
+}
+
+static netdev_tx_t ftgmac100_hard_start_xmit(struct sk_buff *skb,
+					     struct net_device *netdev)
+{
+	struct ftgmac100 *priv = netdev_priv(netdev);
+	struct ftgmac100_txdes *txdes, *first;
+	unsigned int pointer, nfrags, len, i, j;
+	u32 f_ctl_stat, ctl_stat, csum_vlan;
+	dma_addr_t map;
+
+	/* The HW doesn't pad small frames */
+	if (eth_skb_pad(skb)) {
+		netdev->stats.tx_dropped++;
+		return NETDEV_TX_OK;
+	}
+
+	/* Reject oversize packets */
+	if (unlikely(skb->len > MAX_PKT_SIZE)) {
+		if (net_ratelimit())
+			netdev_dbg(netdev, "tx packet too big\n");
+		goto drop;
+	}
+
+	/* Do we have a limit on #fragments ? I yet have to get a reply
+	 * from Aspeed. If there's one I haven't hit it.
+	 */
+	nfrags = skb_shinfo(skb)->nr_frags;
+
+	/* Setup HW checksumming */
+	csum_vlan = 0;
+	if (skb->ip_summed == CHECKSUM_PARTIAL &&
+	    !ftgmac100_prep_tx_csum(skb, &csum_vlan))
+		goto drop;
+
+	/* Add VLAN tag */
+	if (skb_vlan_tag_present(skb)) {
+		csum_vlan |= FTGMAC100_TXDES1_INS_VLANTAG;
+		csum_vlan |= skb_vlan_tag_get(skb) & 0xffff;
+	}
+
+	/* Get header len */
+	len = skb_headlen(skb);
+
+	/* Map the packet head */
+	map = dma_map_single(priv->dev, skb->data, len, DMA_TO_DEVICE);
+	if (dma_mapping_error(priv->dev, map)) {
+		if (net_ratelimit())
+			netdev_err(netdev, "map tx packet head failed\n");
+		goto drop;
+	}
+
+	/* Grab the next free tx descriptor */
+	pointer = priv->tx_pointer;
+	txdes = first = &priv->txdes[pointer];
+
+	/* Setup it up with the packet head. Don't write the head to the
+	 * ring just yet
+	 */
+	priv->tx_skbs[pointer] = skb;
+	f_ctl_stat = ftgmac100_base_tx_ctlstat(priv, pointer);
+	f_ctl_stat |= FTGMAC100_TXDES0_TXDMA_OWN;
+	f_ctl_stat |= FTGMAC100_TXDES0_TXBUF_SIZE(len);
+	f_ctl_stat |= FTGMAC100_TXDES0_FTS;
+	if (nfrags == 0)
+		f_ctl_stat |= FTGMAC100_TXDES0_LTS;
+	txdes->txdes3 = cpu_to_le32(map);
+	txdes->txdes1 = cpu_to_le32(csum_vlan);
+
+	/* Next descriptor */
+	pointer = ftgmac100_next_tx_pointer(priv, pointer);
+
+	/* Add the fragments */
+	for (i = 0; i < nfrags; i++) {
+		skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
+
+		len = skb_frag_size(frag);
+
+		/* Map it */
+		map = skb_frag_dma_map(priv->dev, frag, 0, len,
+				       DMA_TO_DEVICE);
+		if (dma_mapping_error(priv->dev, map))
+			goto dma_err;
+
+		/* Setup descriptor */
+		priv->tx_skbs[pointer] = skb;
+		txdes = &priv->txdes[pointer];
+		ctl_stat = ftgmac100_base_tx_ctlstat(priv, pointer);
+		ctl_stat |= FTGMAC100_TXDES0_TXDMA_OWN;
+		ctl_stat |= FTGMAC100_TXDES0_TXBUF_SIZE(len);
+		if (i == (nfrags - 1))
+			ctl_stat |= FTGMAC100_TXDES0_LTS;
+		txdes->txdes0 = cpu_to_le32(ctl_stat);
+		txdes->txdes1 = 0;
+		txdes->txdes3 = cpu_to_le32(map);
+
+		/* Next one */
+		pointer = ftgmac100_next_tx_pointer(priv, pointer);
+	}
+
+	/* Order the previous packet and descriptor udpates
+	 * before setting the OWN bit on the first descriptor.
+	 */
+	dma_wmb();
+	first->txdes0 = cpu_to_le32(f_ctl_stat);
+
+	/* Update next TX pointer */
+	priv->tx_pointer = pointer;
+
+	/* If there isn't enough room for all the fragments of a new packet
+	 * in the TX ring, stop the queue. The sequence below is race free
+	 * vs. a concurrent restart in ftgmac100_poll()
+	 */
+	if (unlikely(ftgmac100_tx_buf_avail(priv) < TX_THRESHOLD)) {
+		netif_stop_queue(netdev);
+		/* Order the queue stop with the test below */
+		smp_mb();
+		if (ftgmac100_tx_buf_avail(priv) >= TX_THRESHOLD)
+			netif_wake_queue(netdev);
+	}
+
+	/* Poke transmitter to read the updated TX descriptors */
+	iowrite32(1, priv->base + FTGMAC100_OFFSET_NPTXPD);
+
+	return NETDEV_TX_OK;
+
+ dma_err:
+	if (net_ratelimit())
+		netdev_err(netdev, "map tx fragment failed\n");
+
+	/* Free head */
+	pointer = priv->tx_pointer;
+	ftgmac100_free_tx_packet(priv, pointer, skb, first, f_ctl_stat);
+	first->txdes0 = cpu_to_le32(f_ctl_stat & priv->txdes0_edotr_mask);
+
+	/* Then all fragments */
+	for (j = 0; j < i; j++) {
+		pointer = ftgmac100_next_tx_pointer(priv, pointer);
+		txdes = &priv->txdes[pointer];
+		ctl_stat = le32_to_cpu(txdes->txdes0);
+		ftgmac100_free_tx_packet(priv, pointer, skb, txdes, ctl_stat);
+		txdes->txdes0 = cpu_to_le32(ctl_stat & priv->txdes0_edotr_mask);
+	}
+
+	/* This cannot be reached if we successfully mapped the
+	 * last fragment, so we know ftgmac100_free_tx_packet()
+	 * hasn't freed the skb yet.
+	 */
+ drop:
+	/* Drop the packet */
+	dev_kfree_skb_any(skb);
+	netdev->stats.tx_dropped++;
+
+	return NETDEV_TX_OK;
+}
+
+static void ftgmac100_free_buffers(struct ftgmac100 *priv)
+{
+	int i;
+
+	/* Free all RX buffers */
+	for (i = 0; i < priv->rx_q_entries; i++) {
+		struct ftgmac100_rxdes *rxdes = &priv->rxdes[i];
+		struct sk_buff *skb = priv->rx_skbs[i];
+		dma_addr_t map = le32_to_cpu(rxdes->rxdes3);
+
+		if (!skb)
+			continue;
+
+		priv->rx_skbs[i] = NULL;
+		dma_unmap_single(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE);
+		dev_kfree_skb_any(skb);
+	}
+
+	/* Free all TX buffers */
+	for (i = 0; i < priv->tx_q_entries; i++) {
+		struct ftgmac100_txdes *txdes = &priv->txdes[i];
+		struct sk_buff *skb = priv->tx_skbs[i];
+
+		if (!skb)
+			continue;
+		ftgmac100_free_tx_packet(priv, i, skb, txdes,
+					 le32_to_cpu(txdes->txdes0));
+	}
+}
+
+static void ftgmac100_free_rings(struct ftgmac100 *priv)
+{
+	/* Free skb arrays */
+	kfree(priv->rx_skbs);
+	kfree(priv->tx_skbs);
+
+	/* Free descriptors */
+	if (priv->rxdes)
+		dma_free_coherent(priv->dev, MAX_RX_QUEUE_ENTRIES *
+				  sizeof(struct ftgmac100_rxdes),
+				  priv->rxdes, priv->rxdes_dma);
+	priv->rxdes = NULL;
+
+	if (priv->txdes)
+		dma_free_coherent(priv->dev, MAX_TX_QUEUE_ENTRIES *
+				  sizeof(struct ftgmac100_txdes),
+				  priv->txdes, priv->txdes_dma);
+	priv->txdes = NULL;
+
+	/* Free scratch packet buffer */
+	if (priv->rx_scratch)
+		dma_free_coherent(priv->dev, RX_BUF_SIZE,
+				  priv->rx_scratch, priv->rx_scratch_dma);
+}
+
+static int ftgmac100_alloc_rings(struct ftgmac100 *priv)
+{
+	/* Allocate skb arrays */
+	priv->rx_skbs = kcalloc(MAX_RX_QUEUE_ENTRIES, sizeof(void *),
+				GFP_KERNEL);
+	if (!priv->rx_skbs)
+		return -ENOMEM;
+	priv->tx_skbs = kcalloc(MAX_TX_QUEUE_ENTRIES, sizeof(void *),
+				GFP_KERNEL);
+	if (!priv->tx_skbs)
+		return -ENOMEM;
+
+	/* Allocate descriptors */
+	priv->rxdes = dma_alloc_coherent(priv->dev,
+					 MAX_RX_QUEUE_ENTRIES * sizeof(struct ftgmac100_rxdes),
+					 &priv->rxdes_dma, GFP_KERNEL);
+	if (!priv->rxdes)
+		return -ENOMEM;
+	priv->txdes = dma_alloc_coherent(priv->dev,
+					 MAX_TX_QUEUE_ENTRIES * sizeof(struct ftgmac100_txdes),
+					 &priv->txdes_dma, GFP_KERNEL);
+	if (!priv->txdes)
+		return -ENOMEM;
+
+	/* Allocate scratch packet buffer */
+	priv->rx_scratch = dma_alloc_coherent(priv->dev,
+					      RX_BUF_SIZE,
+					      &priv->rx_scratch_dma,
+					      GFP_KERNEL);
+	if (!priv->rx_scratch)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static void ftgmac100_init_rings(struct ftgmac100 *priv)
+{
+	struct ftgmac100_rxdes *rxdes = NULL;
+	struct ftgmac100_txdes *txdes = NULL;
+	int i;
+
+	/* Update entries counts */
+	priv->rx_q_entries = priv->new_rx_q_entries;
+	priv->tx_q_entries = priv->new_tx_q_entries;
+
+	if (WARN_ON(priv->rx_q_entries < MIN_RX_QUEUE_ENTRIES))
+		return;
+
+	/* Initialize RX ring */
+	for (i = 0; i < priv->rx_q_entries; i++) {
+		rxdes = &priv->rxdes[i];
+		rxdes->rxdes0 = 0;
+		rxdes->rxdes3 = cpu_to_le32(priv->rx_scratch_dma);
+	}
+	/* Mark the end of the ring */
+	rxdes->rxdes0 |= cpu_to_le32(priv->rxdes0_edorr_mask);
+
+	if (WARN_ON(priv->tx_q_entries < MIN_RX_QUEUE_ENTRIES))
+		return;
+
+	/* Initialize TX ring */
+	for (i = 0; i < priv->tx_q_entries; i++) {
+		txdes = &priv->txdes[i];
+		txdes->txdes0 = 0;
+	}
+	txdes->txdes0 |= cpu_to_le32(priv->txdes0_edotr_mask);
+}
+
+static int ftgmac100_alloc_rx_buffers(struct ftgmac100 *priv)
+{
+	int i;
+
+	for (i = 0; i < priv->rx_q_entries; i++) {
+		struct ftgmac100_rxdes *rxdes = &priv->rxdes[i];
+
+		if (ftgmac100_alloc_rx_buf(priv, i, rxdes, GFP_KERNEL))
+			return -ENOMEM;
+	}
+	return 0;
+}
+
+static int ftgmac100_mdiobus_read(struct mii_bus *bus, int phy_addr, int regnum)
+{
+	struct net_device *netdev = bus->priv;
+	struct ftgmac100 *priv = netdev_priv(netdev);
+	unsigned int phycr;
+	int i;
+
+	phycr = ioread32(priv->base + FTGMAC100_OFFSET_PHYCR);
+
+	/* preserve MDC cycle threshold */
+	phycr &= FTGMAC100_PHYCR_MDC_CYCTHR_MASK;
+
+	phycr |= FTGMAC100_PHYCR_PHYAD(phy_addr) |
+		 FTGMAC100_PHYCR_REGAD(regnum) |
+		 FTGMAC100_PHYCR_MIIRD;
+
+	iowrite32(phycr, priv->base + FTGMAC100_OFFSET_PHYCR);
+
+	for (i = 0; i < 10; i++) {
+		phycr = ioread32(priv->base + FTGMAC100_OFFSET_PHYCR);
+
+		if ((phycr & FTGMAC100_PHYCR_MIIRD) == 0) {
+			int data;
+
+			data = ioread32(priv->base + FTGMAC100_OFFSET_PHYDATA);
+			return FTGMAC100_PHYDATA_MIIRDATA(data);
+		}
+
+		udelay(100);
+	}
+
+	netdev_err(netdev, "mdio read timed out\n");
+	return -EIO;
+}
+
+static int ftgmac100_mdiobus_write(struct mii_bus *bus, int phy_addr,
+				   int regnum, u16 value)
+{
+	struct net_device *netdev = bus->priv;
+	struct ftgmac100 *priv = netdev_priv(netdev);
+	unsigned int phycr;
+	int data;
+	int i;
+
+	phycr = ioread32(priv->base + FTGMAC100_OFFSET_PHYCR);
+
+	/* preserve MDC cycle threshold */
+	phycr &= FTGMAC100_PHYCR_MDC_CYCTHR_MASK;
+
+	phycr |= FTGMAC100_PHYCR_PHYAD(phy_addr) |
+		 FTGMAC100_PHYCR_REGAD(regnum) |
+		 FTGMAC100_PHYCR_MIIWR;
+
+	data = FTGMAC100_PHYDATA_MIIWDATA(value);
+
+	iowrite32(data, priv->base + FTGMAC100_OFFSET_PHYDATA);
+	iowrite32(phycr, priv->base + FTGMAC100_OFFSET_PHYCR);
+
+	for (i = 0; i < 10; i++) {
+		phycr = ioread32(priv->base + FTGMAC100_OFFSET_PHYCR);
+
+		if ((phycr & FTGMAC100_PHYCR_MIIWR) == 0)
+			return 0;
+
+		udelay(100);
+	}
+
+	netdev_err(netdev, "mdio write timed out\n");
+	return -EIO;
+}
+
+static void ftgmac100_get_drvinfo(struct net_device *netdev,
+				  struct ethtool_drvinfo *info)
+{
+	strscpy(info->driver, DRV_NAME, sizeof(info->driver));
+	strscpy(info->bus_info, dev_name(&netdev->dev), sizeof(info->bus_info));
+}
+
+static void
+ftgmac100_get_ringparam(struct net_device *netdev,
+			struct ethtool_ringparam *ering,
+			struct kernel_ethtool_ringparam *kernel_ering,
+			struct netlink_ext_ack *extack)
+{
+	struct ftgmac100 *priv = netdev_priv(netdev);
+
+	memset(ering, 0, sizeof(*ering));
+	ering->rx_max_pending = MAX_RX_QUEUE_ENTRIES;
+	ering->tx_max_pending = MAX_TX_QUEUE_ENTRIES;
+	ering->rx_pending = priv->rx_q_entries;
+	ering->tx_pending = priv->tx_q_entries;
+}
+
+static int
+ftgmac100_set_ringparam(struct net_device *netdev,
+			struct ethtool_ringparam *ering,
+			struct kernel_ethtool_ringparam *kernel_ering,
+			struct netlink_ext_ack *extack)
+{
+	struct ftgmac100 *priv = netdev_priv(netdev);
+
+	if (ering->rx_pending > MAX_RX_QUEUE_ENTRIES ||
+	    ering->tx_pending > MAX_TX_QUEUE_ENTRIES ||
+	    ering->rx_pending < MIN_RX_QUEUE_ENTRIES ||
+	    ering->tx_pending < MIN_TX_QUEUE_ENTRIES ||
+	    !is_power_of_2(ering->rx_pending) ||
+	    !is_power_of_2(ering->tx_pending))
+		return -EINVAL;
+
+	priv->new_rx_q_entries = ering->rx_pending;
+	priv->new_tx_q_entries = ering->tx_pending;
+	if (netif_running(netdev))
+		schedule_work(&priv->reset_task);
+
+	return 0;
+}
+
+static void ftgmac100_get_pauseparam(struct net_device *netdev,
+				     struct ethtool_pauseparam *pause)
+{
+	struct ftgmac100 *priv = netdev_priv(netdev);
+
+	pause->autoneg = priv->aneg_pause;
+	pause->tx_pause = priv->tx_pause;
+	pause->rx_pause = priv->rx_pause;
+}
+
+static int ftgmac100_set_pauseparam(struct net_device *netdev,
+				    struct ethtool_pauseparam *pause)
+{
+	struct ftgmac100 *priv = netdev_priv(netdev);
+	struct phy_device *phydev = netdev->phydev;
+
+	priv->aneg_pause = pause->autoneg;
+	priv->tx_pause = pause->tx_pause;
+	priv->rx_pause = pause->rx_pause;
+
+	if (phydev)
+		phy_set_asym_pause(phydev, pause->rx_pause, pause->tx_pause);
+
+	if (netif_running(netdev)) {
+		if (!(phydev && priv->aneg_pause))
+			ftgmac100_config_pause(priv);
+	}
+
+	return 0;
+}
+
+static const struct ethtool_ops ftgmac100_ethtool_ops = {
+	.get_drvinfo		= ftgmac100_get_drvinfo,
+	.get_link		= ethtool_op_get_link,
+	.get_link_ksettings	= phy_ethtool_get_link_ksettings,
+	.set_link_ksettings	= phy_ethtool_set_link_ksettings,
+	.nway_reset		= phy_ethtool_nway_reset,
+	.get_ringparam		= ftgmac100_get_ringparam,
+	.set_ringparam		= ftgmac100_set_ringparam,
+	.get_pauseparam		= ftgmac100_get_pauseparam,
+	.set_pauseparam		= ftgmac100_set_pauseparam,
+};
+
+static irqreturn_t ftgmac100_interrupt(int irq, void *dev_id)
+{
+	struct net_device *netdev = dev_id;
+	struct ftgmac100 *priv = netdev_priv(netdev);
+	unsigned int status, new_mask = FTGMAC100_INT_BAD;
+
+	/* Fetch and clear interrupt bits, process abnormal ones */
+	status = ioread32(priv->base + FTGMAC100_OFFSET_ISR);
+	iowrite32(status, priv->base + FTGMAC100_OFFSET_ISR);
+	if (unlikely(status & FTGMAC100_INT_BAD)) {
+
+		/* RX buffer unavailable */
+		if (status & FTGMAC100_INT_NO_RXBUF)
+			netdev->stats.rx_over_errors++;
+
+		/* received packet lost due to RX FIFO full */
+		if (status & FTGMAC100_INT_RPKT_LOST)
+			netdev->stats.rx_fifo_errors++;
+
+		/* sent packet lost due to excessive TX collision */
+		if (status & FTGMAC100_INT_XPKT_LOST)
+			netdev->stats.tx_fifo_errors++;
+
+		/* AHB error -> Reset the chip */
+		if (status & FTGMAC100_INT_AHB_ERR) {
+			if (net_ratelimit())
+				netdev_warn(netdev,
+					   "AHB bus error ! Resetting chip.\n");
+			iowrite32(0, priv->base + FTGMAC100_OFFSET_IER);
+			schedule_work(&priv->reset_task);
+			return IRQ_HANDLED;
+		}
+
+		/* We may need to restart the MAC after such errors, delay
+		 * this until after we have freed some Rx buffers though
+		 */
+		priv->need_mac_restart = true;
+
+		/* Disable those errors until we restart */
+		new_mask &= ~status;
+	}
+
+	/* Only enable "bad" interrupts while NAPI is on */
+	iowrite32(new_mask, priv->base + FTGMAC100_OFFSET_IER);
+
+	/* Schedule NAPI bh */
+	napi_schedule_irqoff(&priv->napi);
+
+	return IRQ_HANDLED;
+}
+
+static bool ftgmac100_check_rx(struct ftgmac100 *priv)
+{
+	struct ftgmac100_rxdes *rxdes = &priv->rxdes[priv->rx_pointer];
+
+	/* Do we have a packet ? */
+	return !!(rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_RXPKT_RDY));
+}
+
+static int ftgmac100_poll(struct napi_struct *napi, int budget)
+{
+	struct ftgmac100 *priv = container_of(napi, struct ftgmac100, napi);
+	int work_done = 0;
+	bool more;
+
+	/* Handle TX completions */
+	if (ftgmac100_tx_buf_cleanable(priv))
+		ftgmac100_tx_complete(priv);
+
+	/* Handle RX packets */
+	do {
+		more = ftgmac100_rx_packet(priv, &work_done);
+	} while (more && work_done < budget);
+
+
+	/* The interrupt is telling us to kick the MAC back to life
+	 * after an RX overflow
+	 */
+	if (unlikely(priv->need_mac_restart)) {
+		ftgmac100_start_hw(priv);
+		priv->need_mac_restart = false;
+
+		/* Re-enable "bad" interrupts */
+		iowrite32(FTGMAC100_INT_BAD,
+			  priv->base + FTGMAC100_OFFSET_IER);
+	}
+
+	/* As long as we are waiting for transmit packets to be
+	 * completed we keep NAPI going
+	 */
+	if (ftgmac100_tx_buf_cleanable(priv))
+		work_done = budget;
+
+	if (work_done < budget) {
+		/* We are about to re-enable all interrupts. However
+		 * the HW has been latching RX/TX packet interrupts while
+		 * they were masked. So we clear them first, then we need
+		 * to re-check if there's something to process
+		 */
+		iowrite32(FTGMAC100_INT_RXTX,
+			  priv->base + FTGMAC100_OFFSET_ISR);
+
+		/* Push the above (and provides a barrier vs. subsequent
+		 * reads of the descriptor).
+		 */
+		ioread32(priv->base + FTGMAC100_OFFSET_ISR);
+
+		/* Check RX and TX descriptors for more work to do */
+		if (ftgmac100_check_rx(priv) ||
+		    ftgmac100_tx_buf_cleanable(priv))
+			return budget;
+
+		/* deschedule NAPI */
+		napi_complete(napi);
+
+		/* enable all interrupts */
+		iowrite32(FTGMAC100_INT_ALL,
+			  priv->base + FTGMAC100_OFFSET_IER);
+	}
+
+	return work_done;
+}
+
+static int ftgmac100_init_all(struct ftgmac100 *priv, bool ignore_alloc_err)
+{
+	int err = 0;
+
+	/* Re-init descriptors (adjust queue sizes) */
+	ftgmac100_init_rings(priv);
+
+	/* Realloc rx descriptors */
+	err = ftgmac100_alloc_rx_buffers(priv);
+	if (err && !ignore_alloc_err)
+		return err;
+
+	/* Reinit and restart HW */
+	ftgmac100_init_hw(priv);
+	ftgmac100_config_pause(priv);
+	ftgmac100_start_hw(priv);
+
+	/* Re-enable the device */
+	napi_enable(&priv->napi);
+	netif_start_queue(priv->netdev);
+
+	/* Enable all interrupts */
+	iowrite32(FTGMAC100_INT_ALL, priv->base + FTGMAC100_OFFSET_IER);
+
+	return err;
+}
+
+static void ftgmac100_reset(struct ftgmac100 *priv)
+{
+	struct net_device *netdev = priv->netdev;
+	int err;
+
+	netdev_dbg(netdev, "Resetting NIC...\n");
+
+	/* Lock the world */
+	rtnl_lock();
+	if (netdev->phydev)
+		mutex_lock(&netdev->phydev->lock);
+	if (priv->mii_bus)
+		mutex_lock(&priv->mii_bus->mdio_lock);
+
+
+	/* Check if the interface is still up */
+	if (!netif_running(netdev))
+		goto bail;
+
+	/* Stop the network stack */
+	netif_trans_update(netdev);
+	napi_disable(&priv->napi);
+	netif_tx_disable(netdev);
+
+	/* Stop and reset the MAC */
+	ftgmac100_stop_hw(priv);
+	err = ftgmac100_reset_and_config_mac(priv);
+	if (err) {
+		/* Not much we can do ... it might come back... */
+		netdev_err(netdev, "attempting to continue...\n");
+	}
+
+	/* Free all rx and tx buffers */
+	ftgmac100_free_buffers(priv);
+
+	/* Setup everything again and restart chip */
+	ftgmac100_init_all(priv, true);
+
+	netdev_dbg(netdev, "Reset done !\n");
+ bail:
+	if (priv->mii_bus)
+		mutex_unlock(&priv->mii_bus->mdio_lock);
+	if (netdev->phydev)
+		mutex_unlock(&netdev->phydev->lock);
+	rtnl_unlock();
+}
+
+static void ftgmac100_reset_task(struct work_struct *work)
+{
+	struct ftgmac100 *priv = container_of(work, struct ftgmac100,
+					      reset_task);
+
+	ftgmac100_reset(priv);
+}
+
+static void ftgmac100_adjust_link(struct net_device *netdev)
+{
+	struct ftgmac100 *priv = netdev_priv(netdev);
+	struct phy_device *phydev = netdev->phydev;
+	bool tx_pause, rx_pause;
+	int new_speed;
+
+	/* We store "no link" as speed 0 */
+	if (!phydev->link)
+		new_speed = 0;
+	else
+		new_speed = phydev->speed;
+
+	/* Grab pause settings from PHY if configured to do so */
+	if (priv->aneg_pause) {
+		rx_pause = tx_pause = phydev->pause;
+		if (phydev->asym_pause)
+			tx_pause = !rx_pause;
+	} else {
+		rx_pause = priv->rx_pause;
+		tx_pause = priv->tx_pause;
+	}
+
+	/* Link hasn't changed, do nothing */
+	if (phydev->speed == priv->cur_speed &&
+	    phydev->duplex == priv->cur_duplex &&
+	    rx_pause == priv->rx_pause &&
+	    tx_pause == priv->tx_pause)
+		return;
+
+	/* Print status if we have a link or we had one and just lost it,
+	 * don't print otherwise.
+	 */
+	if (new_speed || priv->cur_speed)
+		phy_print_status(phydev);
+
+	priv->cur_speed = new_speed;
+	priv->cur_duplex = phydev->duplex;
+	priv->rx_pause = rx_pause;
+	priv->tx_pause = tx_pause;
+
+	/* Link is down, do nothing else */
+	if (!new_speed)
+		return;
+
+	/* Disable all interrupts */
+	iowrite32(0, priv->base + FTGMAC100_OFFSET_IER);
+
+	/* Release phy lock to allow ftgmac100_reset to aquire it, keeping lock
+	 * order consistent to prevent dead lock.
+	 */
+	if (netdev->phydev)
+		mutex_unlock(&netdev->phydev->lock);
+
+	ftgmac100_reset(priv);
+
+	if (netdev->phydev)
+		mutex_lock(&netdev->phydev->lock);
+
+}
+
+static int ftgmac100_mii_probe(struct net_device *netdev)
+{
+	struct ftgmac100 *priv = netdev_priv(netdev);
+	struct platform_device *pdev = to_platform_device(priv->dev);
+	struct device_node *np = pdev->dev.of_node;
+	struct phy_device *phydev;
+	phy_interface_t phy_intf;
+	int err;
+
+	/* Default to RGMII. It's a gigabit part after all */
+	err = of_get_phy_mode(np, &phy_intf);
+	if (err)
+		phy_intf = PHY_INTERFACE_MODE_RGMII;
+
+	/* Aspeed only supports these. I don't know about other IP
+	 * block vendors so I'm going to just let them through for
+	 * now. Note that this is only a warning if for some obscure
+	 * reason the DT really means to lie about it or it's a newer
+	 * part we don't know about.
+	 *
+	 * On the Aspeed SoC there are additionally straps and SCU
+	 * control bits that could tell us what the interface is
+	 * (or allow us to configure it while the IP block is held
+	 * in reset). For now I chose to keep this driver away from
+	 * those SoC specific bits and assume the device-tree is
+	 * right and the SCU has been configured properly by pinmux
+	 * or the firmware.
+	 */
+	if (priv->is_aspeed && !(phy_interface_mode_is_rgmii(phy_intf))) {
+		netdev_warn(netdev,
+			    "Unsupported PHY mode %s !\n",
+			    phy_modes(phy_intf));
+	}
+
+	phydev = phy_find_first(priv->mii_bus);
+	if (!phydev) {
+		netdev_info(netdev, "%s: no PHY found\n", netdev->name);
+		return -ENODEV;
+	}
+
+	phydev = phy_connect(netdev, phydev_name(phydev),
+			     &ftgmac100_adjust_link, phy_intf);
+
+	if (IS_ERR(phydev)) {
+		netdev_err(netdev, "%s: Could not attach to PHY\n", netdev->name);
+		return PTR_ERR(phydev);
+	}
+
+	/* Indicate that we support PAUSE frames (see comment in
+	 * Documentation/networking/phy.rst)
+	 */
+	phy_support_asym_pause(phydev);
+
+	/* Display what we found */
+	phy_attached_info(phydev);
+
+	return 0;
+}
+
+static int ftgmac100_open(struct net_device *netdev)
+{
+	struct ftgmac100 *priv = netdev_priv(netdev);
+	int err;
+
+	/* Allocate ring buffers  */
+	err = ftgmac100_alloc_rings(priv);
+	if (err) {
+		netdev_err(netdev, "Failed to allocate descriptors\n");
+		return err;
+	}
+
+	/* When using NC-SI we force the speed to 100Mbit/s full duplex,
+	 *
+	 * Otherwise we leave it set to 0 (no link), the link
+	 * message from the PHY layer will handle setting it up to
+	 * something else if needed.
+	 */
+	if (priv->use_ncsi) {
+		priv->cur_duplex = DUPLEX_FULL;
+		priv->cur_speed = SPEED_100;
+	} else {
+		priv->cur_duplex = 0;
+		priv->cur_speed = 0;
+	}
+
+	/* Reset the hardware */
+	err = ftgmac100_reset_and_config_mac(priv);
+	if (err)
+		goto err_hw;
+
+	/* Initialize NAPI */
+	netif_napi_add(netdev, &priv->napi, ftgmac100_poll);
+
+	/* Grab our interrupt */
+	err = request_irq(netdev->irq, ftgmac100_interrupt, 0, netdev->name, netdev);
+	if (err) {
+		netdev_err(netdev, "failed to request irq %d\n", netdev->irq);
+		goto err_irq;
+	}
+
+	/* Start things up */
+	err = ftgmac100_init_all(priv, false);
+	if (err) {
+		netdev_err(netdev, "Failed to allocate packet buffers\n");
+		goto err_alloc;
+	}
+
+	if (netdev->phydev) {
+		/* If we have a PHY, start polling */
+		phy_start(netdev->phydev);
+	} else if (priv->use_ncsi) {
+		/* If using NC-SI, set our carrier on and start the stack */
+		netif_carrier_on(netdev);
+
+		/* Start the NCSI device */
+		err = ncsi_start_dev(priv->ndev);
+		if (err)
+			goto err_ncsi;
+	}
+
+	return 0;
+
+ err_ncsi:
+	napi_disable(&priv->napi);
+	netif_stop_queue(netdev);
+ err_alloc:
+	ftgmac100_free_buffers(priv);
+	free_irq(netdev->irq, netdev);
+ err_irq:
+	netif_napi_del(&priv->napi);
+ err_hw:
+	iowrite32(0, priv->base + FTGMAC100_OFFSET_IER);
+	ftgmac100_free_rings(priv);
+	return err;
+}
+
+static int ftgmac100_stop(struct net_device *netdev)
+{
+	struct ftgmac100 *priv = netdev_priv(netdev);
+
+	/* Note about the reset task: We are called with the rtnl lock
+	 * held, so we are synchronized against the core of the reset
+	 * task. We must not try to synchronously cancel it otherwise
+	 * we can deadlock. But since it will test for netif_running()
+	 * which has already been cleared by the net core, we don't
+	 * anything special to do.
+	 */
+
+	/* disable all interrupts */
+	iowrite32(0, priv->base + FTGMAC100_OFFSET_IER);
+
+	netif_stop_queue(netdev);
+	napi_disable(&priv->napi);
+	netif_napi_del(&priv->napi);
+	if (netdev->phydev)
+		phy_stop(netdev->phydev);
+	else if (priv->use_ncsi)
+		ncsi_stop_dev(priv->ndev);
+
+	ftgmac100_stop_hw(priv);
+	free_irq(netdev->irq, netdev);
+	ftgmac100_free_buffers(priv);
+	ftgmac100_free_rings(priv);
+
+	return 0;
+}
+
+static void ftgmac100_tx_timeout(struct net_device *netdev, unsigned int txqueue)
+{
+	struct ftgmac100 *priv = netdev_priv(netdev);
+
+	/* Disable all interrupts */
+	iowrite32(0, priv->base + FTGMAC100_OFFSET_IER);
+
+	/* Do the reset outside of interrupt context */
+	schedule_work(&priv->reset_task);
+}
+
+static int ftgmac100_set_features(struct net_device *netdev,
+				  netdev_features_t features)
+{
+	struct ftgmac100 *priv = netdev_priv(netdev);
+	netdev_features_t changed = netdev->features ^ features;
+
+	if (!netif_running(netdev))
+		return 0;
+
+	/* Update the vlan filtering bit */
+	if (changed & NETIF_F_HW_VLAN_CTAG_RX) {
+		u32 maccr;
+
+		maccr = ioread32(priv->base + FTGMAC100_OFFSET_MACCR);
+		if (priv->netdev->features & NETIF_F_HW_VLAN_CTAG_RX)
+			maccr |= FTGMAC100_MACCR_RM_VLAN;
+		else
+			maccr &= ~FTGMAC100_MACCR_RM_VLAN;
+		iowrite32(maccr, priv->base + FTGMAC100_OFFSET_MACCR);
+	}
+
+	return 0;
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void ftgmac100_poll_controller(struct net_device *netdev)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	ftgmac100_interrupt(netdev->irq, netdev);
+	local_irq_restore(flags);
+}
+#endif
+
+static const struct net_device_ops ftgmac100_netdev_ops = {
+	.ndo_open		= ftgmac100_open,
+	.ndo_stop		= ftgmac100_stop,
+	.ndo_start_xmit		= ftgmac100_hard_start_xmit,
+	.ndo_set_mac_address	= ftgmac100_set_mac_addr,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_eth_ioctl		= phy_do_ioctl,
+	.ndo_tx_timeout		= ftgmac100_tx_timeout,
+	.ndo_set_rx_mode	= ftgmac100_set_rx_mode,
+	.ndo_set_features	= ftgmac100_set_features,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	.ndo_poll_controller	= ftgmac100_poll_controller,
+#endif
+	.ndo_vlan_rx_add_vid	= ncsi_vlan_rx_add_vid,
+	.ndo_vlan_rx_kill_vid	= ncsi_vlan_rx_kill_vid,
+};
+
+static int ftgmac100_setup_mdio(struct net_device *netdev)
+{
+	struct ftgmac100 *priv = netdev_priv(netdev);
+	struct platform_device *pdev = to_platform_device(priv->dev);
+	struct device_node *np = pdev->dev.of_node;
+	struct device_node *mdio_np;
+	int i, err = 0;
+	u32 reg;
+
+	/* initialize mdio bus */
+	priv->mii_bus = mdiobus_alloc();
+	if (!priv->mii_bus)
+		return -EIO;
+
+	if (of_device_is_compatible(np, "aspeed,ast2400-mac") ||
+	    of_device_is_compatible(np, "aspeed,ast2500-mac")) {
+		/* The AST2600 has a separate MDIO controller */
+
+		/* For the AST2400 and AST2500 this driver only supports the
+		 * old MDIO interface
+		 */
+		reg = ioread32(priv->base + FTGMAC100_OFFSET_REVR);
+		reg &= ~FTGMAC100_REVR_NEW_MDIO_INTERFACE;
+		iowrite32(reg, priv->base + FTGMAC100_OFFSET_REVR);
+	}
+
+	priv->mii_bus->name = "ftgmac100_mdio";
+	snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s-%d",
+		 pdev->name, pdev->id);
+	priv->mii_bus->parent = priv->dev;
+	priv->mii_bus->priv = priv->netdev;
+	priv->mii_bus->read = ftgmac100_mdiobus_read;
+	priv->mii_bus->write = ftgmac100_mdiobus_write;
+
+	for (i = 0; i < PHY_MAX_ADDR; i++)
+		priv->mii_bus->irq[i] = PHY_POLL;
+
+	mdio_np = of_get_child_by_name(np, "mdio");
+
+	err = of_mdiobus_register(priv->mii_bus, mdio_np);
+	if (err) {
+		dev_err(priv->dev, "Cannot register MDIO bus!\n");
+		goto err_register_mdiobus;
+	}
+
+	of_node_put(mdio_np);
+
+	return 0;
+
+err_register_mdiobus:
+	mdiobus_free(priv->mii_bus);
+	return err;
+}
+
+static void ftgmac100_phy_disconnect(struct net_device *netdev)
+{
+	struct ftgmac100 *priv = netdev_priv(netdev);
+
+	if (!netdev->phydev)
+		return;
+
+	phy_disconnect(netdev->phydev);
+	if (of_phy_is_fixed_link(priv->dev->of_node))
+		of_phy_deregister_fixed_link(priv->dev->of_node);
+}
+
+static void ftgmac100_destroy_mdio(struct net_device *netdev)
+{
+	struct ftgmac100 *priv = netdev_priv(netdev);
+
+	if (!priv->mii_bus)
+		return;
+
+	mdiobus_unregister(priv->mii_bus);
+	mdiobus_free(priv->mii_bus);
+}
+
+static void ftgmac100_ncsi_handler(struct ncsi_dev *nd)
+{
+	if (unlikely(nd->state != ncsi_dev_state_functional))
+		return;
+
+	netdev_dbg(nd->dev, "NCSI interface %s\n",
+		   nd->link_up ? "up" : "down");
+}
+
+static int ftgmac100_setup_clk(struct ftgmac100 *priv)
+{
+	struct clk *clk;
+	int rc;
+
+	clk = devm_clk_get(priv->dev, NULL /* MACCLK */);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+	priv->clk = clk;
+	rc = clk_prepare_enable(priv->clk);
+	if (rc)
+		return rc;
+
+	/* Aspeed specifies a 100MHz clock is required for up to
+	 * 1000Mbit link speeds. As NCSI is limited to 100Mbit, 25MHz
+	 * is sufficient
+	 */
+	rc = clk_set_rate(priv->clk, priv->use_ncsi ? FTGMAC_25MHZ :
+			  FTGMAC_100MHZ);
+	if (rc)
+		goto cleanup_clk;
+
+	/* RCLK is for RMII, typically used for NCSI. Optional because it's not
+	 * necessary if it's the AST2400 MAC, or the MAC is configured for
+	 * RGMII, or the controller is not an ASPEED-based controller.
+	 */
+	priv->rclk = devm_clk_get_optional(priv->dev, "RCLK");
+	rc = clk_prepare_enable(priv->rclk);
+	if (!rc)
+		return 0;
+
+cleanup_clk:
+	clk_disable_unprepare(priv->clk);
+
+	return rc;
+}
+
+static bool ftgmac100_has_child_node(struct device_node *np, const char *name)
+{
+	struct device_node *child_np = of_get_child_by_name(np, name);
+	bool ret = false;
+
+	if (child_np) {
+		ret = true;
+		of_node_put(child_np);
+	}
+
+	return ret;
+}
+
+static int ftgmac100_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	int irq;
+	struct net_device *netdev;
+	struct ftgmac100 *priv;
+	struct device_node *np;
+	int err = 0;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENXIO;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	/* setup net_device */
+	netdev = alloc_etherdev(sizeof(*priv));
+	if (!netdev) {
+		err = -ENOMEM;
+		goto err_alloc_etherdev;
+	}
+
+	SET_NETDEV_DEV(netdev, &pdev->dev);
+
+	netdev->ethtool_ops = &ftgmac100_ethtool_ops;
+	netdev->netdev_ops = &ftgmac100_netdev_ops;
+	netdev->watchdog_timeo = 5 * HZ;
+
+	platform_set_drvdata(pdev, netdev);
+
+	/* setup private data */
+	priv = netdev_priv(netdev);
+	priv->netdev = netdev;
+	priv->dev = &pdev->dev;
+	INIT_WORK(&priv->reset_task, ftgmac100_reset_task);
+
+	/* map io memory */
+	priv->res = request_mem_region(res->start, resource_size(res),
+				       dev_name(&pdev->dev));
+	if (!priv->res) {
+		dev_err(&pdev->dev, "Could not reserve memory region\n");
+		err = -ENOMEM;
+		goto err_req_mem;
+	}
+
+	priv->base = ioremap(res->start, resource_size(res));
+	if (!priv->base) {
+		dev_err(&pdev->dev, "Failed to ioremap ethernet registers\n");
+		err = -EIO;
+		goto err_ioremap;
+	}
+
+	netdev->irq = irq;
+
+	/* Enable pause */
+	priv->tx_pause = true;
+	priv->rx_pause = true;
+	priv->aneg_pause = true;
+
+	/* MAC address from chip or random one */
+	err = ftgmac100_initial_mac(priv);
+	if (err)
+		goto err_phy_connect;
+
+	np = pdev->dev.of_node;
+	if (np && (of_device_is_compatible(np, "aspeed,ast2400-mac") ||
+		   of_device_is_compatible(np, "aspeed,ast2500-mac") ||
+		   of_device_is_compatible(np, "aspeed,ast2600-mac"))) {
+		priv->rxdes0_edorr_mask = BIT(30);
+		priv->txdes0_edotr_mask = BIT(30);
+		priv->is_aspeed = true;
+	} else {
+		priv->rxdes0_edorr_mask = BIT(15);
+		priv->txdes0_edotr_mask = BIT(15);
+	}
+
+	if (np && of_get_property(np, "use-ncsi", NULL)) {
+		if (!IS_ENABLED(CONFIG_NET_NCSI)) {
+			dev_err(&pdev->dev, "NCSI stack not enabled\n");
+			err = -EINVAL;
+			goto err_phy_connect;
+		}
+
+		dev_info(&pdev->dev, "Using NCSI interface\n");
+		priv->use_ncsi = true;
+		priv->ndev = ncsi_register_dev(netdev, ftgmac100_ncsi_handler);
+		if (!priv->ndev) {
+			err = -EINVAL;
+			goto err_phy_connect;
+		}
+	} else if (np && of_phy_is_fixed_link(np)) {
+		struct phy_device *phy;
+
+		err = of_phy_register_fixed_link(np);
+		if (err) {
+			dev_err(&pdev->dev, "Failed to register fixed PHY\n");
+			goto err_phy_connect;
+		}
+
+		phy = of_phy_get_and_connect(priv->netdev, np,
+					     &ftgmac100_adjust_link);
+		if (!phy) {
+			dev_err(&pdev->dev, "Failed to connect to fixed PHY\n");
+			of_phy_deregister_fixed_link(np);
+			err = -EINVAL;
+			goto err_phy_connect;
+		}
+
+		/* Display what we found */
+		phy_attached_info(phy);
+	} else if (np && of_get_property(np, "phy-handle", NULL)) {
+		struct phy_device *phy;
+
+		/* Support "mdio"/"phy" child nodes for ast2400/2500 with
+		 * an embedded MDIO controller. Automatically scan the DTS for
+		 * available PHYs and register them.
+		 */
+		if (of_device_is_compatible(np, "aspeed,ast2400-mac") ||
+		    of_device_is_compatible(np, "aspeed,ast2500-mac")) {
+			err = ftgmac100_setup_mdio(netdev);
+			if (err)
+				goto err_setup_mdio;
+		}
+
+		phy = of_phy_get_and_connect(priv->netdev, np,
+					     &ftgmac100_adjust_link);
+		if (!phy) {
+			dev_err(&pdev->dev, "Failed to connect to phy\n");
+			err = -EINVAL;
+			goto err_phy_connect;
+		}
+
+		/* Indicate that we support PAUSE frames (see comment in
+		 * Documentation/networking/phy.rst)
+		 */
+		phy_support_asym_pause(phy);
+
+		/* Display what we found */
+		phy_attached_info(phy);
+	} else if (np && !ftgmac100_has_child_node(np, "mdio")) {
+		/* Support legacy ASPEED devicetree descriptions that decribe a
+		 * MAC with an embedded MDIO controller but have no "mdio"
+		 * child node. Automatically scan the MDIO bus for available
+		 * PHYs.
+		 */
+		priv->use_ncsi = false;
+		err = ftgmac100_setup_mdio(netdev);
+		if (err)
+			goto err_setup_mdio;
+
+		err = ftgmac100_mii_probe(netdev);
+		if (err) {
+			dev_err(priv->dev, "MII probe failed!\n");
+			goto err_ncsi_dev;
+		}
+
+	}
+
+	if (priv->is_aspeed) {
+		err = ftgmac100_setup_clk(priv);
+		if (err)
+			goto err_phy_connect;
+
+		/* Disable ast2600 problematic HW arbitration */
+		if (of_device_is_compatible(np, "aspeed,ast2600-mac"))
+			iowrite32(FTGMAC100_TM_DEFAULT,
+				  priv->base + FTGMAC100_OFFSET_TM);
+	}
+
+	/* Default ring sizes */
+	priv->rx_q_entries = priv->new_rx_q_entries = DEF_RX_QUEUE_ENTRIES;
+	priv->tx_q_entries = priv->new_tx_q_entries = DEF_TX_QUEUE_ENTRIES;
+
+	/* Base feature set */
+	netdev->hw_features = NETIF_F_RXCSUM | NETIF_F_HW_CSUM |
+		NETIF_F_GRO | NETIF_F_SG | NETIF_F_HW_VLAN_CTAG_RX |
+		NETIF_F_HW_VLAN_CTAG_TX;
+
+	if (priv->use_ncsi)
+		netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_FILTER;
+
+	/* AST2400  doesn't have working HW checksum generation */
+	if (np && (of_device_is_compatible(np, "aspeed,ast2400-mac")))
+		netdev->hw_features &= ~NETIF_F_HW_CSUM;
+
+	/* AST2600 tx checksum with NCSI is broken */
+	if (priv->use_ncsi && of_device_is_compatible(np, "aspeed,ast2600-mac"))
+		netdev->hw_features &= ~NETIF_F_HW_CSUM;
+
+	if (np && of_get_property(np, "no-hw-checksum", NULL))
+		netdev->hw_features &= ~(NETIF_F_HW_CSUM | NETIF_F_RXCSUM);
+	netdev->features |= netdev->hw_features;
+
+	/* register network device */
+	err = register_netdev(netdev);
+	if (err) {
+		dev_err(&pdev->dev, "Failed to register netdev\n");
+		goto err_register_netdev;
+	}
+
+	netdev_info(netdev, "irq %d, mapped at %p\n", netdev->irq, priv->base);
+
+	return 0;
+
+err_register_netdev:
+	clk_disable_unprepare(priv->rclk);
+	clk_disable_unprepare(priv->clk);
+err_phy_connect:
+	ftgmac100_phy_disconnect(netdev);
+err_ncsi_dev:
+	if (priv->ndev)
+		ncsi_unregister_dev(priv->ndev);
+	ftgmac100_destroy_mdio(netdev);
+err_setup_mdio:
+	iounmap(priv->base);
+err_ioremap:
+	release_resource(priv->res);
+err_req_mem:
+	free_netdev(netdev);
+err_alloc_etherdev:
+	return err;
+}
+
+static int ftgmac100_remove(struct platform_device *pdev)
+{
+	struct net_device *netdev;
+	struct ftgmac100 *priv;
+
+	netdev = platform_get_drvdata(pdev);
+	priv = netdev_priv(netdev);
+
+	if (priv->ndev)
+		ncsi_unregister_dev(priv->ndev);
+	unregister_netdev(netdev);
+
+	clk_disable_unprepare(priv->rclk);
+	clk_disable_unprepare(priv->clk);
+
+	/* There's a small chance the reset task will have been re-queued,
+	 * during stop, make sure it's gone before we free the structure.
+	 */
+	cancel_work_sync(&priv->reset_task);
+
+	ftgmac100_phy_disconnect(netdev);
+	ftgmac100_destroy_mdio(netdev);
+
+	iounmap(priv->base);
+	release_resource(priv->res);
+
+	netif_napi_del(&priv->napi);
+	free_netdev(netdev);
+	return 0;
+}
+
+static const struct of_device_id ftgmac100_of_match[] = {
+	{ .compatible = "faraday,ftgmac100" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ftgmac100_of_match);
+
+static struct platform_driver ftgmac100_driver = {
+	.probe	= ftgmac100_probe,
+	.remove	= ftgmac100_remove,
+	.driver	= {
+		.name		= DRV_NAME,
+		.of_match_table	= ftgmac100_of_match,
+	},
+};
+module_platform_driver(ftgmac100_driver);
+
+MODULE_AUTHOR("Po-Yu Chuang <ratbert@faraday-tech.com>");
+MODULE_DESCRIPTION("FTGMAC100 driver");
+MODULE_LICENSE("GPL");