net: add Faraday FTGMAC100 Gigabit Ethernet driver

FTGMAC100 Ethernet Media Access Controller supports 10/100/1000 Mbps
and MII/GMII.  This driver has been working on some ARM/NDS32 SoC's
including Faraday A369 and Andes AG102.
Signed-off-by: Po-Yu Chuang <ratbert@faraday-tech.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/Kconfig

@@ -2560,6 +2560,15 @@ config PCH_GBE
 	  ML7223 is companion chip for Intel Atom E6xx series.
 	  ML7223 is completely compatible for Intel EG20T PCH.
 
+config FTGMAC100
+	tristate "Faraday FTGMAC100 Gigabit Ethernet support"
+	depends on ARM
+	select PHYLIB
+	help
+	  This driver supports the FTGMAC100 Gigabit Ethernet controller
+	  from Faraday. It is used on Faraday A369, Andes AG102 and some
+	  other ARM/NDS32 SoC's.
+
 endif # NETDEV_1000
 
 #

drivers/net/Makefile

@@ -148,6 +148,7 @@ obj-$(CONFIG_FORCEDETH) += forcedeth.o
 obj-$(CONFIG_NE_H8300) += ne-h8300.o
 obj-$(CONFIG_AX88796) += ax88796.o
 obj-$(CONFIG_BCM63XX_ENET) += bcm63xx_enet.o
+obj-$(CONFIG_FTGMAC100) += ftgmac100.o
 obj-$(CONFIG_FTMAC100) += ftmac100.o
 
 obj-$(CONFIG_TSI108_ETH) += tsi108_eth.o

drivers/net/ftgmac100.c

+/*
+ * Faraday FTGMAC100 Gigabit Ethernet
+ *
+ * (C) Copyright 2009-2011 Faraday Technology
+ * Po-Yu Chuang <ratbert@faraday-tech.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
+
+#include <linux/dma-mapping.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/phy.h>
+#include <linux/platform_device.h>
+#include <net/ip.h>
+
+#include "ftgmac100.h"
+
+#define DRV_NAME	"ftgmac100"
+#define DRV_VERSION	"0.7"
+
+#define RX_QUEUE_ENTRIES	256	/* must be power of 2 */
+#define TX_QUEUE_ENTRIES	512	/* must be power of 2 */
+
+#define MAX_PKT_SIZE		1518
+#define RX_BUF_SIZE		PAGE_SIZE	/* must be smaller than 0x3fff */
+
+/******************************************************************************
+ * private data
+ *****************************************************************************/
+struct ftgmac100_descs {
+	struct ftgmac100_rxdes rxdes[RX_QUEUE_ENTRIES];
+	struct ftgmac100_txdes txdes[TX_QUEUE_ENTRIES];
+};
+
+struct ftgmac100 {
+	struct resource *res;
+	void __iomem *base;
+	int irq;
+
+	struct ftgmac100_descs *descs;
+	dma_addr_t descs_dma_addr;
+
+	unsigned int rx_pointer;
+	unsigned int tx_clean_pointer;
+	unsigned int tx_pointer;
+	unsigned int tx_pending;
+
+	spinlock_t tx_lock;
+
+	struct net_device *netdev;
+	struct device *dev;
+	struct napi_struct napi;
+
+	struct mii_bus *mii_bus;
+	int phy_irq[PHY_MAX_ADDR];
+	struct phy_device *phydev;
+	int old_speed;
+};
+
+static int ftgmac100_alloc_rx_page(struct ftgmac100 *priv,
+				   struct ftgmac100_rxdes *rxdes, gfp_t gfp);
+
+/******************************************************************************
+ * internal functions (hardware register access)
+ *****************************************************************************/
+#define INT_MASK_ALL_ENABLED	(FTGMAC100_INT_RPKT_LOST	| \
+				 FTGMAC100_INT_XPKT_ETH		| \
+				 FTGMAC100_INT_XPKT_LOST	| \
+				 FTGMAC100_INT_AHB_ERR		| \
+				 FTGMAC100_INT_PHYSTS_CHG	| \
+				 FTGMAC100_INT_RPKT_BUF		| \
+				 FTGMAC100_INT_NO_RXBUF)
+
+static void ftgmac100_set_rx_ring_base(struct ftgmac100 *priv, dma_addr_t addr)
+{
+	iowrite32(addr, priv->base + FTGMAC100_OFFSET_RXR_BADR);
+}
+
+static void ftgmac100_set_rx_buffer_size(struct ftgmac100 *priv,
+		unsigned int size)
+{
+	size = FTGMAC100_RBSR_SIZE(size);
+	iowrite32(size, priv->base + FTGMAC100_OFFSET_RBSR);
+}
+
+static void ftgmac100_set_normal_prio_tx_ring_base(struct ftgmac100 *priv,
+						   dma_addr_t addr)
+{
+	iowrite32(addr, priv->base + FTGMAC100_OFFSET_NPTXR_BADR);
+}
+
+static void ftgmac100_txdma_normal_prio_start_polling(struct ftgmac100 *priv)
+{
+	iowrite32(1, priv->base + FTGMAC100_OFFSET_NPTXPD);
+}
+
+static int ftgmac100_reset_hw(struct ftgmac100 *priv)
+{
+	struct net_device *netdev = priv->netdev;
+	int i;
+
+	/* NOTE: reset clears all registers */
+	iowrite32(FTGMAC100_MACCR_SW_RST, priv->base + FTGMAC100_OFFSET_MACCR);
+	for (i = 0; i < 5; i++) {
+		unsigned int maccr;
+
+		maccr = ioread32(priv->base + FTGMAC100_OFFSET_MACCR);
+		if (!(maccr & FTGMAC100_MACCR_SW_RST))
+			return 0;
+
+		udelay(1000);
+	}
+
+	netdev_err(netdev, "software reset failed\n");
+	return -EIO;
+}
+
+static void ftgmac100_set_mac(struct ftgmac100 *priv, const unsigned char *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 void ftgmac100_init_hw(struct ftgmac100 *priv)
+{
+	/* setup ring buffer base registers */
+	ftgmac100_set_rx_ring_base(priv,
+				   priv->descs_dma_addr +
+				   offsetof(struct ftgmac100_descs, rxdes));
+	ftgmac100_set_normal_prio_tx_ring_base(priv,
+					       priv->descs_dma_addr +
+					       offsetof(struct ftgmac100_descs, txdes));
+
+	ftgmac100_set_rx_buffer_size(priv, RX_BUF_SIZE);
+
+	iowrite32(FTGMAC100_APTC_RXPOLL_CNT(1), priv->base + FTGMAC100_OFFSET_APTC);
+
+	ftgmac100_set_mac(priv, priv->netdev->dev_addr);
+}
+
+#define MACCR_ENABLE_ALL	(FTGMAC100_MACCR_TXDMA_EN	| \
+				 FTGMAC100_MACCR_RXDMA_EN	| \
+				 FTGMAC100_MACCR_TXMAC_EN	| \
+				 FTGMAC100_MACCR_RXMAC_EN	| \
+				 FTGMAC100_MACCR_FULLDUP	| \
+				 FTGMAC100_MACCR_CRC_APD	| \
+				 FTGMAC100_MACCR_RX_RUNT	| \
+				 FTGMAC100_MACCR_RX_BROADPKT)
+
+static void ftgmac100_start_hw(struct ftgmac100 *priv, int speed)
+{
+	int maccr = MACCR_ENABLE_ALL;
+
+	switch (speed) {
+	default:
+	case 10:
+		break;
+
+	case 100:
+		maccr |= FTGMAC100_MACCR_FAST_MODE;
+		break;
+
+	case 1000:
+		maccr |= FTGMAC100_MACCR_GIGA_MODE;
+		break;
+	}
+
+	iowrite32(maccr, priv->base + FTGMAC100_OFFSET_MACCR);
+}
+
+static void ftgmac100_stop_hw(struct ftgmac100 *priv)
+{
+	iowrite32(0, priv->base + FTGMAC100_OFFSET_MACCR);
+}
+
+/******************************************************************************
+ * internal functions (receive descriptor)
+ *****************************************************************************/
+static bool ftgmac100_rxdes_first_segment(struct ftgmac100_rxdes *rxdes)
+{
+	return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_FRS);
+}
+
+static bool ftgmac100_rxdes_last_segment(struct ftgmac100_rxdes *rxdes)
+{
+	return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_LRS);
+}
+
+static bool ftgmac100_rxdes_packet_ready(struct ftgmac100_rxdes *rxdes)
+{
+	return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_RXPKT_RDY);
+}
+
+static void ftgmac100_rxdes_set_dma_own(struct ftgmac100_rxdes *rxdes)
+{
+	/* clear status bits */
+	rxdes->rxdes0 &= cpu_to_le32(FTGMAC100_RXDES0_EDORR);
+}
+
+static bool ftgmac100_rxdes_rx_error(struct ftgmac100_rxdes *rxdes)
+{
+	return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_RX_ERR);
+}
+
+static bool ftgmac100_rxdes_crc_error(struct ftgmac100_rxdes *rxdes)
+{
+	return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_CRC_ERR);
+}
+
+static bool ftgmac100_rxdes_frame_too_long(struct ftgmac100_rxdes *rxdes)
+{
+	return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_FTL);
+}
+
+static bool ftgmac100_rxdes_runt(struct ftgmac100_rxdes *rxdes)
+{
+	return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_RUNT);
+}
+
+static bool ftgmac100_rxdes_odd_nibble(struct ftgmac100_rxdes *rxdes)
+{
+	return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_RX_ODD_NB);
+}
+
+static unsigned int ftgmac100_rxdes_data_length(struct ftgmac100_rxdes *rxdes)
+{
+	return le32_to_cpu(rxdes->rxdes0) & FTGMAC100_RXDES0_VDBC;
+}
+
+static bool ftgmac100_rxdes_multicast(struct ftgmac100_rxdes *rxdes)
+{
+	return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_MULTICAST);
+}
+
+static void ftgmac100_rxdes_set_end_of_ring(struct ftgmac100_rxdes *rxdes)
+{
+	rxdes->rxdes0 |= cpu_to_le32(FTGMAC100_RXDES0_EDORR);
+}
+
+static void ftgmac100_rxdes_set_dma_addr(struct ftgmac100_rxdes *rxdes,
+					 dma_addr_t addr)
+{
+	rxdes->rxdes3 = cpu_to_le32(addr);
+}
+
+static dma_addr_t ftgmac100_rxdes_get_dma_addr(struct ftgmac100_rxdes *rxdes)
+{
+	return le32_to_cpu(rxdes->rxdes3);
+}
+
+static bool ftgmac100_rxdes_is_tcp(struct ftgmac100_rxdes *rxdes)
+{
+	return (rxdes->rxdes1 & cpu_to_le32(FTGMAC100_RXDES1_PROT_MASK)) ==
+	       cpu_to_le32(FTGMAC100_RXDES1_PROT_TCPIP);
+}
+
+static bool ftgmac100_rxdes_is_udp(struct ftgmac100_rxdes *rxdes)
+{
+	return (rxdes->rxdes1 & cpu_to_le32(FTGMAC100_RXDES1_PROT_MASK)) ==
+	       cpu_to_le32(FTGMAC100_RXDES1_PROT_UDPIP);
+}
+
+static bool ftgmac100_rxdes_tcpcs_err(struct ftgmac100_rxdes *rxdes)
+{
+	return rxdes->rxdes1 & cpu_to_le32(FTGMAC100_RXDES1_TCP_CHKSUM_ERR);
+}
+
+static bool ftgmac100_rxdes_udpcs_err(struct ftgmac100_rxdes *rxdes)
+{
+	return rxdes->rxdes1 & cpu_to_le32(FTGMAC100_RXDES1_UDP_CHKSUM_ERR);
+}
+
+static bool ftgmac100_rxdes_ipcs_err(struct ftgmac100_rxdes *rxdes)
+{
+	return rxdes->rxdes1 & cpu_to_le32(FTGMAC100_RXDES1_IP_CHKSUM_ERR);
+}
+
+/*
+ * rxdes2 is not used by hardware. We use it to keep track of page.
+ * Since hardware does not touch it, we can skip cpu_to_le32()/le32_to_cpu().
+ */
+static void ftgmac100_rxdes_set_page(struct ftgmac100_rxdes *rxdes, struct page *page)
+{
+	rxdes->rxdes2 = (unsigned int)page;
+}
+
+static struct page *ftgmac100_rxdes_get_page(struct ftgmac100_rxdes *rxdes)
+{
+	return (struct page *)rxdes->rxdes2;
+}
+
+/******************************************************************************
+ * internal functions (receive)
+ *****************************************************************************/
+static int ftgmac100_next_rx_pointer(int pointer)
+{
+	return (pointer + 1) & (RX_QUEUE_ENTRIES - 1);
+}
+
+static void ftgmac100_rx_pointer_advance(struct ftgmac100 *priv)
+{
+	priv->rx_pointer = ftgmac100_next_rx_pointer(priv->rx_pointer);
+}
+
+static struct ftgmac100_rxdes *ftgmac100_current_rxdes(struct ftgmac100 *priv)
+{
+	return &priv->descs->rxdes[priv->rx_pointer];
+}
+
+static struct ftgmac100_rxdes *
+ftgmac100_rx_locate_first_segment(struct ftgmac100 *priv)
+{
+	struct ftgmac100_rxdes *rxdes = ftgmac100_current_rxdes(priv);
+
+	while (ftgmac100_rxdes_packet_ready(rxdes)) {
+		if (ftgmac100_rxdes_first_segment(rxdes))
+			return rxdes;
+
+		ftgmac100_rxdes_set_dma_own(rxdes);
+		ftgmac100_rx_pointer_advance(priv);
+		rxdes = ftgmac100_current_rxdes(priv);
+	}
+
+	return NULL;
+}
+
+static bool ftgmac100_rx_packet_error(struct ftgmac100 *priv,
+				      struct ftgmac100_rxdes *rxdes)
+{
+	struct net_device *netdev = priv->netdev;
+	bool error = false;
+
+	if (unlikely(ftgmac100_rxdes_rx_error(rxdes))) {
+		if (net_ratelimit())
+			netdev_info(netdev, "rx err\n");
+
+		netdev->stats.rx_errors++;
+		error = true;
+	}
+
+	if (unlikely(ftgmac100_rxdes_crc_error(rxdes))) {
+		if (net_ratelimit())
+			netdev_info(netdev, "rx crc err\n");
+
+		netdev->stats.rx_crc_errors++;
+		error = true;
+	} else if (unlikely(ftgmac100_rxdes_ipcs_err(rxdes))) {
+		if (net_ratelimit())
+			netdev_info(netdev, "rx IP checksum err\n");
+
+		error = true;
+	}
+
+	if (unlikely(ftgmac100_rxdes_frame_too_long(rxdes))) {
+		if (net_ratelimit())
+			netdev_info(netdev, "rx frame too long\n");
+
+		netdev->stats.rx_length_errors++;
+		error = true;
+	} else if (unlikely(ftgmac100_rxdes_runt(rxdes))) {
+		if (net_ratelimit())
+			netdev_info(netdev, "rx runt\n");
+
+		netdev->stats.rx_length_errors++;
+		error = true;
+	} else if (unlikely(ftgmac100_rxdes_odd_nibble(rxdes))) {
+		if (net_ratelimit())
+			netdev_info(netdev, "rx odd nibble\n");
+
+		netdev->stats.rx_length_errors++;
+		error = true;
+	}
+
+	return error;
+}
+
+static void ftgmac100_rx_drop_packet(struct ftgmac100 *priv)
+{
+	struct net_device *netdev = priv->netdev;
+	struct ftgmac100_rxdes *rxdes = ftgmac100_current_rxdes(priv);
+	bool done = false;
+
+	if (net_ratelimit())
+		netdev_dbg(netdev, "drop packet %p\n", rxdes);
+
+	do {
+		if (ftgmac100_rxdes_last_segment(rxdes))
+			done = true;
+
+		ftgmac100_rxdes_set_dma_own(rxdes);
+		ftgmac100_rx_pointer_advance(priv);
+		rxdes = ftgmac100_current_rxdes(priv);
+	} while (!done && ftgmac100_rxdes_packet_ready(rxdes));
+
+	netdev->stats.rx_dropped++;
+}
+
+static bool ftgmac100_rx_packet(struct ftgmac100 *priv, int *processed)
+{
+	struct net_device *netdev = priv->netdev;
+	struct ftgmac100_rxdes *rxdes;
+	struct sk_buff *skb;
+	bool done = false;
+
+	rxdes = ftgmac100_rx_locate_first_segment(priv);
+	if (!rxdes)
+		return false;
+
+	if (unlikely(ftgmac100_rx_packet_error(priv, rxdes))) {
+		ftgmac100_rx_drop_packet(priv);
+		return true;
+	}
+
+	/* start processing */
+	skb = netdev_alloc_skb_ip_align(netdev, 128);
+	if (unlikely(!skb)) {
+		if (net_ratelimit())
+			netdev_err(netdev, "rx skb alloc failed\n");
+
+		ftgmac100_rx_drop_packet(priv);
+		return true;
+	}
+
+	if (unlikely(ftgmac100_rxdes_multicast(rxdes)))
+		netdev->stats.multicast++;
+
+	/*
+	 * It seems that HW does checksum incorrectly with fragmented packets,
+	 * so we are conservative here - if HW checksum error, let software do
+	 * the checksum again.
+	 */
+	if ((ftgmac100_rxdes_is_tcp(rxdes) && !ftgmac100_rxdes_tcpcs_err(rxdes)) ||
+	    (ftgmac100_rxdes_is_udp(rxdes) && !ftgmac100_rxdes_udpcs_err(rxdes)))
+		skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+	do {
+		dma_addr_t map = ftgmac100_rxdes_get_dma_addr(rxdes);
+		struct page *page = ftgmac100_rxdes_get_page(rxdes);
+		unsigned int size;
+
+		dma_unmap_page(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE);
+
+		size = ftgmac100_rxdes_data_length(rxdes);
+		skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page, 0, size);
+
+		skb->len += size;
+		skb->data_len += size;
+		skb->truesize += size;
+
+		if (ftgmac100_rxdes_last_segment(rxdes))
+			done = true;
+
+		ftgmac100_alloc_rx_page(priv, rxdes, GFP_ATOMIC);
+
+		ftgmac100_rx_pointer_advance(priv);
+		rxdes = ftgmac100_current_rxdes(priv);
+	} while (!done);
+
+	__pskb_pull_tail(skb, min(skb->len, 64U));
+	skb->protocol = eth_type_trans(skb, netdev);
+
+	netdev->stats.rx_packets++;
+	netdev->stats.rx_bytes += skb->len;
+
+	/* push packet to protocol stack */
+	napi_gro_receive(&priv->napi, skb);
+
+	(*processed)++;
+	return true;
+}
+
+/******************************************************************************
+ * internal functions (transmit descriptor)
+ *****************************************************************************/
+static void ftgmac100_txdes_reset(struct ftgmac100_txdes *txdes)
+{
+	/* clear all except end of ring bit */
+	txdes->txdes0 &= cpu_to_le32(FTGMAC100_TXDES0_EDOTR);
+	txdes->txdes1 = 0;
+	txdes->txdes2 = 0;
+	txdes->txdes3 = 0;
+}
+
+static bool ftgmac100_txdes_owned_by_dma(struct ftgmac100_txdes *txdes)
+{
+	return txdes->txdes0 & cpu_to_le32(FTGMAC100_TXDES0_TXDMA_OWN);
+}
+
+static void ftgmac100_txdes_set_dma_own(struct ftgmac100_txdes *txdes)
+{
+	/*
+	 * Make sure dma own bit will not be set before any other
+	 * descriptor fields.
+	 */
+	wmb();
+	txdes->txdes0 |= cpu_to_le32(FTGMAC100_TXDES0_TXDMA_OWN);
+}
+
+static void ftgmac100_txdes_set_end_of_ring(struct ftgmac100_txdes *txdes)
+{
+	txdes->txdes0 |= cpu_to_le32(FTGMAC100_TXDES0_EDOTR);
+}
+
+static void ftgmac100_txdes_set_first_segment(struct ftgmac100_txdes *txdes)
+{
+	txdes->txdes0 |= cpu_to_le32(FTGMAC100_TXDES0_FTS);
+}
+
+static void ftgmac100_txdes_set_last_segment(struct ftgmac100_txdes *txdes)
+{
+	txdes->txdes0 |= cpu_to_le32(FTGMAC100_TXDES0_LTS);
+}
+
+static void ftgmac100_txdes_set_buffer_size(struct ftgmac100_txdes *txdes,
+					    unsigned int len)
+{
+	txdes->txdes0 |= cpu_to_le32(FTGMAC100_TXDES0_TXBUF_SIZE(len));
+}
+
+static void ftgmac100_txdes_set_txint(struct ftgmac100_txdes *txdes)
+{
+	txdes->txdes1 |= cpu_to_le32(FTGMAC100_TXDES1_TXIC);
+}
+
+static void ftgmac100_txdes_set_tcpcs(struct ftgmac100_txdes *txdes)
+{
+	txdes->txdes1 |= cpu_to_le32(FTGMAC100_TXDES1_TCP_CHKSUM);
+}
+
+static void ftgmac100_txdes_set_udpcs(struct ftgmac100_txdes *txdes)
+{
+	txdes->txdes1 |= cpu_to_le32(FTGMAC100_TXDES1_UDP_CHKSUM);
+}
+
+static void ftgmac100_txdes_set_ipcs(struct ftgmac100_txdes *txdes)
+{
+	txdes->txdes1 |= cpu_to_le32(FTGMAC100_TXDES1_IP_CHKSUM);
+}
+
+static void ftgmac100_txdes_set_dma_addr(struct ftgmac100_txdes *txdes,
+					 dma_addr_t addr)
+{
+	txdes->txdes3 = cpu_to_le32(addr);
+}
+
+static dma_addr_t ftgmac100_txdes_get_dma_addr(struct ftgmac100_txdes *txdes)
+{
+	return le32_to_cpu(txdes->txdes3);
+}
+
+/*
+ * txdes2 is not used by hardware. We use it to keep track of socket buffer.
+ * Since hardware does not touch it, we can skip cpu_to_le32()/le32_to_cpu().
+ */
+static void ftgmac100_txdes_set_skb(struct ftgmac100_txdes *txdes,
+				    struct sk_buff *skb)
+{
+	txdes->txdes2 = (unsigned int)skb;
+}
+
+static struct sk_buff *ftgmac100_txdes_get_skb(struct ftgmac100_txdes *txdes)
+{
+	return (struct sk_buff *)txdes->txdes2;
+}
+
+/******************************************************************************
+ * internal functions (transmit)
+ *****************************************************************************/
+static int ftgmac100_next_tx_pointer(int pointer)
+{
+	return (pointer + 1) & (TX_QUEUE_ENTRIES - 1);
+}
+
+static void ftgmac100_tx_pointer_advance(struct ftgmac100 *priv)
+{
+	priv->tx_pointer = ftgmac100_next_tx_pointer(priv->tx_pointer);
+}
+
+static void ftgmac100_tx_clean_pointer_advance(struct ftgmac100 *priv)
+{
+	priv->tx_clean_pointer = ftgmac100_next_tx_pointer(priv->tx_clean_pointer);
+}
+
+static struct ftgmac100_txdes *ftgmac100_current_txdes(struct ftgmac100 *priv)
+{
+	return &priv->descs->txdes[priv->tx_pointer];
+}
+
+static struct ftgmac100_txdes *
+ftgmac100_current_clean_txdes(struct ftgmac100 *priv)
+{
+	return &priv->descs->txdes[priv->tx_clean_pointer];
+}
+
+static bool ftgmac100_tx_complete_packet(struct ftgmac100 *priv)
+{
+	struct net_device *netdev = priv->netdev;
+	struct ftgmac100_txdes *txdes;
+	struct sk_buff *skb;
+	dma_addr_t map;
+
+	if (priv->tx_pending == 0)
+		return false;
+
+	txdes = ftgmac100_current_clean_txdes(priv);
+
+	if (ftgmac100_txdes_owned_by_dma(txdes))
+		return false;
+
+	skb = ftgmac100_txdes_get_skb(txdes);
+	map = ftgmac100_txdes_get_dma_addr(txdes);
+
+	netdev->stats.tx_packets++;
+	netdev->stats.tx_bytes += skb->len;
+
+	dma_unmap_single(priv->dev, map, skb_headlen(skb), DMA_TO_DEVICE);
+
+	dev_kfree_skb(skb);
+
+	ftgmac100_txdes_reset(txdes);
+
+	ftgmac100_tx_clean_pointer_advance(priv);
+
+	spin_lock(&priv->tx_lock);
+	priv->tx_pending--;
+	spin_unlock(&priv->tx_lock);
+	netif_wake_queue(netdev);
+
+	return true;
+}
+
+static void ftgmac100_tx_complete(struct ftgmac100 *priv)
+{
+	while (ftgmac100_tx_complete_packet(priv))
+		;
+}
+
+static int ftgmac100_xmit(struct ftgmac100 *priv, struct sk_buff *skb,
+			  dma_addr_t map)
+{
+	struct net_device *netdev = priv->netdev;
+	struct ftgmac100_txdes *txdes;
+	unsigned int len = (skb->len < ETH_ZLEN) ? ETH_ZLEN : skb->len;
+
+	txdes = ftgmac100_current_txdes(priv);
+	ftgmac100_tx_pointer_advance(priv);
+
+	/* setup TX descriptor */
+	ftgmac100_txdes_set_skb(txdes, skb);
+	ftgmac100_txdes_set_dma_addr(txdes, map);
+	ftgmac100_txdes_set_buffer_size(txdes, len);
+
+	ftgmac100_txdes_set_first_segment(txdes);
+	ftgmac100_txdes_set_last_segment(txdes);
+	ftgmac100_txdes_set_txint(txdes);
+	if (skb->ip_summed == CHECKSUM_PARTIAL) {
+		__be16 protocol = skb->protocol;
+
+		if (protocol == cpu_to_be16(ETH_P_IP)) {
+			u8 ip_proto = ip_hdr(skb)->protocol;
+
+			ftgmac100_txdes_set_ipcs(txdes);
+			if (ip_proto == IPPROTO_TCP)
+				ftgmac100_txdes_set_tcpcs(txdes);
+			else if (ip_proto == IPPROTO_UDP)
+				ftgmac100_txdes_set_udpcs(txdes);
+		}
+	}
+
+	spin_lock(&priv->tx_lock);
+	priv->tx_pending++;
+	if (priv->tx_pending == TX_QUEUE_ENTRIES)
+		netif_stop_queue(netdev);
+
+	/* start transmit */
+	ftgmac100_txdes_set_dma_own(txdes);
+	spin_unlock(&priv->tx_lock);
+
+	ftgmac100_txdma_normal_prio_start_polling(priv);
+
+	return NETDEV_TX_OK;
+}
+
+/******************************************************************************
+ * internal functions (buffer)
+ *****************************************************************************/
+static int ftgmac100_alloc_rx_page(struct ftgmac100 *priv,
+				   struct ftgmac100_rxdes *rxdes, gfp_t gfp)
+{
+	struct net_device *netdev = priv->netdev;
+	struct page *page;
+	dma_addr_t map;
+
+	page = alloc_page(gfp);
+	if (!page) {
+		if (net_ratelimit())
+			netdev_err(netdev, "failed to allocate rx page\n");
+		return -ENOMEM;
+	}
+
+	map = dma_map_page(priv->dev, page, 0, 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");
+		__free_page(page);
+		return -ENOMEM;
+	}
+
+	ftgmac100_rxdes_set_page(rxdes, page);
+	ftgmac100_rxdes_set_dma_addr(rxdes, map);
+	ftgmac100_rxdes_set_dma_own(rxdes);
+	return 0;
+}
+
+static void ftgmac100_free_buffers(struct ftgmac100 *priv)
+{
+	int i;
+
+	for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
+		struct ftgmac100_rxdes *rxdes = &priv->descs->rxdes[i];
+		struct page *page = ftgmac100_rxdes_get_page(rxdes);
+		dma_addr_t map = ftgmac100_rxdes_get_dma_addr(rxdes);
+
+		if (!page)
+			continue;
+
+		dma_unmap_page(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE);
+		__free_page(page);
+	}
+
+	for (i = 0; i < TX_QUEUE_ENTRIES; i++) {
+		struct ftgmac100_txdes *txdes = &priv->descs->txdes[i];
+		struct sk_buff *skb = ftgmac100_txdes_get_skb(txdes);
+		dma_addr_t map = ftgmac100_txdes_get_dma_addr(txdes);
+
+		if (!skb)
+			continue;
+
+		dma_unmap_single(priv->dev, map, skb_headlen(skb), DMA_TO_DEVICE);
+		dev_kfree_skb(skb);
+	}
+
+	dma_free_coherent(priv->dev, sizeof(struct ftgmac100_descs),
+			  priv->descs, priv->descs_dma_addr);
+}
+
+static int ftgmac100_alloc_buffers(struct ftgmac100 *priv)
+{
+	int i;
+
+	priv->descs = dma_alloc_coherent(priv->dev,
+					 sizeof(struct ftgmac100_descs),
+					 &priv->descs_dma_addr, GFP_KERNEL);
+	if (!priv->descs)
+		return -ENOMEM;
+
+	memset(priv->descs, 0, sizeof(struct ftgmac100_descs));
+
+	/* initialize RX ring */
+	ftgmac100_rxdes_set_end_of_ring(&priv->descs->rxdes[RX_QUEUE_ENTRIES - 1]);
+
+	for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
+		struct ftgmac100_rxdes *rxdes = &priv->descs->rxdes[i];
+
+		if (ftgmac100_alloc_rx_page(priv, rxdes, GFP_KERNEL))
+			goto err;
+	}
+
+	/* initialize TX ring */
+	ftgmac100_txdes_set_end_of_ring(&priv->descs->txdes[TX_QUEUE_ENTRIES - 1]);
+	return 0;
+
+err:
+	ftgmac100_free_buffers(priv);
+	return -ENOMEM;
+}
+
+/******************************************************************************
+ * internal functions (mdio)
+ *****************************************************************************/
+static void ftgmac100_adjust_link(struct net_device *netdev)
+{
+	struct ftgmac100 *priv = netdev_priv(netdev);
+	struct phy_device *phydev = priv->phydev;
+	int ier;
+
+	if (phydev->speed == priv->old_speed)
+		return;
+
+	priv->old_speed = phydev->speed;
+
+	ier = ioread32(priv->base + FTGMAC100_OFFSET_IER);
+
+	/* disable all interrupts */
+	iowrite32(0, priv->base + FTGMAC100_OFFSET_IER);
+
+	netif_stop_queue(netdev);
+	ftgmac100_stop_hw(priv);
+
+	netif_start_queue(netdev);
+	ftgmac100_init_hw(priv);
+	ftgmac100_start_hw(priv, phydev->speed);
+
+	/* re-enable interrupts */
+	iowrite32(ier, priv->base + FTGMAC100_OFFSET_IER);
+}
+
+static int ftgmac100_mii_probe(struct ftgmac100 *priv)
+{
+	struct net_device *netdev = priv->netdev;
+	struct phy_device *phydev = NULL;
+	int i;
+
+	/* search for connect PHY device */
+	for (i = 0; i < PHY_MAX_ADDR; i++) {
+		struct phy_device *tmp = priv->mii_bus->phy_map[i];
+
+		if (tmp) {
+			phydev = tmp;
+			break;
+		}
+	}
+
+	/* now we are supposed to have a proper phydev, to attach to... */
+	if (!phydev) {
+		netdev_info(netdev, "%s: no PHY found\n", netdev->name);
+		return -ENODEV;
+	}
+
+	phydev = phy_connect(netdev, dev_name(&phydev->dev),
+			     &ftgmac100_adjust_link, 0,
+			     PHY_INTERFACE_MODE_GMII);
+
+	if (IS_ERR(phydev)) {
+		netdev_err(netdev, "%s: Could not attach to PHY\n", netdev->name);
+		return PTR_ERR(phydev);
+	}
+
+	priv->phydev = phydev;
+	return 0;
+}
+
+/******************************************************************************
+ * struct mii_bus functions
+ *****************************************************************************/
+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 int ftgmac100_mdiobus_reset(struct mii_bus *bus)
+{
+	return 0;
+}
+
+/******************************************************************************
+ * struct ethtool_ops functions
+ *****************************************************************************/
+static void ftgmac100_get_drvinfo(struct net_device *netdev,
+				  struct ethtool_drvinfo *info)
+{
+	strcpy(info->driver, DRV_NAME);
+	strcpy(info->version, DRV_VERSION);
+	strcpy(info->bus_info, dev_name(&netdev->dev));
+}
+
+static int ftgmac100_get_settings(struct net_device *netdev,
+				  struct ethtool_cmd *cmd)
+{
+	struct ftgmac100 *priv = netdev_priv(netdev);
+
+	return phy_ethtool_gset(priv->phydev, cmd);
+}
+
+static int ftgmac100_set_settings(struct net_device *netdev,
+				  struct ethtool_cmd *cmd)
+{
+	struct ftgmac100 *priv = netdev_priv(netdev);
+
+	return phy_ethtool_sset(priv->phydev, cmd);
+}
+
+static const struct ethtool_ops ftgmac100_ethtool_ops = {
+	.set_settings		= ftgmac100_set_settings,
+	.get_settings		= ftgmac100_get_settings,
+	.get_drvinfo		= ftgmac100_get_drvinfo,
+	.get_link		= ethtool_op_get_link,
+};
+
+/******************************************************************************
+ * interrupt handler
+ *****************************************************************************/
+static irqreturn_t ftgmac100_interrupt(int irq, void *dev_id)
+{
+	struct net_device *netdev = dev_id;
+	struct ftgmac100 *priv = netdev_priv(netdev);
+
+	if (likely(netif_running(netdev))) {
+		/* Disable interrupts for polling */
+		iowrite32(0, priv->base + FTGMAC100_OFFSET_IER);
+		napi_schedule(&priv->napi);
+	}
+
+	return IRQ_HANDLED;
+}
+
+/******************************************************************************
+ * struct napi_struct functions
+ *****************************************************************************/
+static int ftgmac100_poll(struct napi_struct *napi, int budget)
+{
+	struct ftgmac100 *priv = container_of(napi, struct ftgmac100, napi);
+	struct net_device *netdev = priv->netdev;
+	unsigned int status;
+	bool completed = true;
+	int rx = 0;
+
+	status = ioread32(priv->base + FTGMAC100_OFFSET_ISR);
+	iowrite32(status, priv->base + FTGMAC100_OFFSET_ISR);
+
+	if (status & (FTGMAC100_INT_RPKT_BUF | FTGMAC100_INT_NO_RXBUF)) {
+		/*
+		 * FTGMAC100_INT_RPKT_BUF:
+		 *	RX DMA has received packets into RX buffer successfully
+		 *
+		 * FTGMAC100_INT_NO_RXBUF:
+		 *	RX buffer unavailable
+		 */
+		bool retry;
+
+		do {
+			retry = ftgmac100_rx_packet(priv, &rx);
+		} while (retry && rx < budget);
+
+		if (retry && rx == budget)
+			completed = false;
+	}
+
+	if (status & (FTGMAC100_INT_XPKT_ETH | FTGMAC100_INT_XPKT_LOST)) {
+		/*
+		 * FTGMAC100_INT_XPKT_ETH:
+		 *	packet transmitted to ethernet successfully
+		 *
+		 * FTGMAC100_INT_XPKT_LOST:
+		 *	packet transmitted to ethernet lost due to late
+		 *	collision or excessive collision
+		 */
+		ftgmac100_tx_complete(priv);
+	}
+
+	if (status & (FTGMAC100_INT_NO_RXBUF | FTGMAC100_INT_RPKT_LOST |
+		      FTGMAC100_INT_AHB_ERR | FTGMAC100_INT_PHYSTS_CHG)) {
+		if (net_ratelimit())
+			netdev_info(netdev, "[ISR] = 0x%x: %s%s%s%s\n", status,
+				    status & FTGMAC100_INT_NO_RXBUF ? "NO_RXBUF " : "",
+				    status & FTGMAC100_INT_RPKT_LOST ? "RPKT_LOST " : "",
+				    status & FTGMAC100_INT_AHB_ERR ? "AHB_ERR " : "",
+				    status & FTGMAC100_INT_PHYSTS_CHG ? "PHYSTS_CHG" : "");
+
+		if (status & FTGMAC100_INT_NO_RXBUF) {
+			/* RX buffer unavailable */
+			netdev->stats.rx_over_errors++;
+		}
+
+		if (status & FTGMAC100_INT_RPKT_LOST) {
+			/* received packet lost due to RX FIFO full */
+			netdev->stats.rx_fifo_errors++;
+		}
+	}
+
+	if (completed) {
+		napi_complete(napi);
+
+		/* enable all interrupts */
+		iowrite32(INT_MASK_ALL_ENABLED, priv->base + FTGMAC100_OFFSET_IER);
+	}
+
+	return rx;
+}
+
+/******************************************************************************
+ * struct net_device_ops functions
+ *****************************************************************************/
+static int ftgmac100_open(struct net_device *netdev)
+{
+	struct ftgmac100 *priv = netdev_priv(netdev);
+	int err;
+
+	err = ftgmac100_alloc_buffers(priv);
+	if (err) {
+		netdev_err(netdev, "failed to allocate buffers\n");
+		goto err_alloc;
+	}
+
+	err = request_irq(priv->irq, ftgmac100_interrupt, 0, netdev->name, netdev);
+	if (err) {
+		netdev_err(netdev, "failed to request irq %d\n", priv->irq);
+		goto err_irq;
+	}
+
+	priv->rx_pointer = 0;
+	priv->tx_clean_pointer = 0;
+	priv->tx_pointer = 0;
+	priv->tx_pending = 0;
+
+	err = ftgmac100_reset_hw(priv);
+	if (err)
+		goto err_hw;
+
+	ftgmac100_init_hw(priv);
+	ftgmac100_start_hw(priv, 10);
+
+	phy_start(priv->phydev);
+
+	napi_enable(&priv->napi);
+	netif_start_queue(netdev);
+
+	/* enable all interrupts */
+	iowrite32(INT_MASK_ALL_ENABLED, priv->base + FTGMAC100_OFFSET_IER);
+	return 0;
+
+err_hw:
+	free_irq(priv->irq, netdev);
+err_irq:
+	ftgmac100_free_buffers(priv);
+err_alloc:
+	return err;
+}
+
+static int ftgmac100_stop(struct net_device *netdev)
+{
+	struct ftgmac100 *priv = netdev_priv(netdev);
+
+	/* disable all interrupts */
+	iowrite32(0, priv->base + FTGMAC100_OFFSET_IER);
+
+	netif_stop_queue(netdev);
+	napi_disable(&priv->napi);
+	phy_stop(priv->phydev);
+
+	ftgmac100_stop_hw(priv);
+	free_irq(priv->irq, netdev);
+	ftgmac100_free_buffers(priv);
+
+	return 0;
+}
+
+static int ftgmac100_hard_start_xmit(struct sk_buff *skb,
+				     struct net_device *netdev)
+{
+	struct ftgmac100 *priv = netdev_priv(netdev);
+	dma_addr_t map;
+
+	if (unlikely(skb->len > MAX_PKT_SIZE)) {
+		if (net_ratelimit())
+			netdev_dbg(netdev, "tx packet too big\n");
+
+		netdev->stats.tx_dropped++;
+		dev_kfree_skb(skb);
+		return NETDEV_TX_OK;
+	}
+
+	map = dma_map_single(priv->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
+	if (unlikely(dma_mapping_error(priv->dev, map))) {
+		/* drop packet */
+		if (net_ratelimit())
+			netdev_err(netdev, "map socket buffer failed\n");
+
+		netdev->stats.tx_dropped++;
+		dev_kfree_skb(skb);
+		return NETDEV_TX_OK;
+	}
+
+	return ftgmac100_xmit(priv, skb, map);
+}
+
+/* optional */
+static int ftgmac100_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
+{
+	struct ftgmac100 *priv = netdev_priv(netdev);
+
+	return phy_mii_ioctl(priv->phydev, ifr, cmd);
+}
+
+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	= eth_mac_addr,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_do_ioctl		= ftgmac100_do_ioctl,
+};
+
+/******************************************************************************
+ * struct platform_driver functions
+ *****************************************************************************/
+static int ftgmac100_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	int irq;
+	struct net_device *netdev;
+	struct ftgmac100 *priv;
+	int err;
+	int i;
+
+	if (!pdev)
+		return -ENODEV;
+
+	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);
+
+	SET_ETHTOOL_OPS(netdev, &ftgmac100_ethtool_ops);
+	netdev->netdev_ops = &ftgmac100_netdev_ops;
+	netdev->features = NETIF_F_IP_CSUM | NETIF_F_GRO;
+
+	platform_set_drvdata(pdev, netdev);
+
+	/* setup private data */
+	priv = netdev_priv(netdev);
+	priv->netdev = netdev;
+	priv->dev = &pdev->dev;
+
+	spin_lock_init(&priv->tx_lock);
+
+	/* initialize NAPI */
+	netif_napi_add(netdev, &priv->napi, ftgmac100_poll, 64);
+
+	/* 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;
+	}
+
+	priv->irq = irq;
+
+	/* initialize mdio bus */
+	priv->mii_bus = mdiobus_alloc();
+	if (!priv->mii_bus) {
+		err = -EIO;
+		goto err_alloc_mdiobus;
+	}
+
+	priv->mii_bus->name = "ftgmac100_mdio";
+	snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "ftgmac100_mii");
+
+	priv->mii_bus->priv = netdev;
+	priv->mii_bus->read = ftgmac100_mdiobus_read;
+	priv->mii_bus->write = ftgmac100_mdiobus_write;
+	priv->mii_bus->reset = ftgmac100_mdiobus_reset;
+	priv->mii_bus->irq = priv->phy_irq;
+
+	for (i = 0; i < PHY_MAX_ADDR; i++)
+		priv->mii_bus->irq[i] = PHY_POLL;
+
+	err = mdiobus_register(priv->mii_bus);
+	if (err) {
+		dev_err(&pdev->dev, "Cannot register MDIO bus!\n");
+		goto err_register_mdiobus;
+	}
+
+	err = ftgmac100_mii_probe(priv);
+	if (err) {
+		dev_err(&pdev->dev, "MII Probe failed!\n");
+		goto err_mii_probe;
+	}
+
+	/* 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", priv->irq, priv->base);
+
+	if (!is_valid_ether_addr(netdev->dev_addr)) {
+		random_ether_addr(netdev->dev_addr);
+		netdev_info(netdev, "generated random MAC address %pM\n",
+			    netdev->dev_addr);
+	}
+
+	return 0;
+
+err_register_netdev:
+	phy_disconnect(priv->phydev);
+err_mii_probe:
+	mdiobus_unregister(priv->mii_bus);
+err_register_mdiobus:
+	mdiobus_free(priv->mii_bus);
+err_alloc_mdiobus:
+	iounmap(priv->base);
+err_ioremap:
+	release_resource(priv->res);
+err_req_mem:
+	netif_napi_del(&priv->napi);
+	platform_set_drvdata(pdev, NULL);
+	free_netdev(netdev);
+err_alloc_etherdev:
+	return err;
+}
+
+static int __exit ftgmac100_remove(struct platform_device *pdev)
+{
+	struct net_device *netdev;
+	struct ftgmac100 *priv;
+
+	netdev = platform_get_drvdata(pdev);
+	priv = netdev_priv(netdev);
+
+	unregister_netdev(netdev);
+
+	phy_disconnect(priv->phydev);
+	mdiobus_unregister(priv->mii_bus);
+	mdiobus_free(priv->mii_bus);
+
+	iounmap(priv->base);
+	release_resource(priv->res);
+
+	netif_napi_del(&priv->napi);
+	platform_set_drvdata(pdev, NULL);
+	free_netdev(netdev);
+	return 0;
+}
+
+static struct platform_driver ftgmac100_driver = {
+	.probe		= ftgmac100_probe,
+	.remove		= __exit_p(ftgmac100_remove),
+	.driver		= {
+		.name	= DRV_NAME,
+		.owner	= THIS_MODULE,
+	},
+};
+
+/******************************************************************************
+ * initialization / finalization
+ *****************************************************************************/
+static int __init ftgmac100_init(void)
+{
+	pr_info("Loading version " DRV_VERSION " ...\n");
+	return platform_driver_register(&ftgmac100_driver);
+}
+
+static void __exit ftgmac100_exit(void)
+{
+	platform_driver_unregister(&ftgmac100_driver);
+}
+
+module_init(ftgmac100_init);
+module_exit(ftgmac100_exit);
+
+MODULE_AUTHOR("Po-Yu Chuang <ratbert@faraday-tech.com>");
+MODULE_DESCRIPTION("FTGMAC100 driver");
+MODULE_LICENSE("GPL");

drivers/net/ftgmac100.h

+/*
+ * Faraday FTGMAC100 Gigabit Ethernet
+ *
+ * (C) Copyright 2009-2011 Faraday Technology
+ * Po-Yu Chuang <ratbert@faraday-tech.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef __FTGMAC100_H
+#define __FTGMAC100_H
+
+#define FTGMAC100_OFFSET_ISR		0x00
+#define FTGMAC100_OFFSET_IER		0x04
+#define FTGMAC100_OFFSET_MAC_MADR	0x08
+#define FTGMAC100_OFFSET_MAC_LADR	0x0c
+#define FTGMAC100_OFFSET_MAHT0		0x10
+#define FTGMAC100_OFFSET_MAHT1		0x14
+#define FTGMAC100_OFFSET_NPTXPD		0x18
+#define FTGMAC100_OFFSET_RXPD		0x1c
+#define FTGMAC100_OFFSET_NPTXR_BADR	0x20
+#define FTGMAC100_OFFSET_RXR_BADR	0x24
+#define FTGMAC100_OFFSET_HPTXPD		0x28
+#define FTGMAC100_OFFSET_HPTXR_BADR	0x2c
+#define FTGMAC100_OFFSET_ITC		0x30
+#define FTGMAC100_OFFSET_APTC		0x34
+#define FTGMAC100_OFFSET_DBLAC		0x38
+#define FTGMAC100_OFFSET_DMAFIFOS	0x3c
+#define FTGMAC100_OFFSET_REVR		0x40
+#define FTGMAC100_OFFSET_FEAR		0x44
+#define FTGMAC100_OFFSET_TPAFCR		0x48
+#define FTGMAC100_OFFSET_RBSR		0x4c
+#define FTGMAC100_OFFSET_MACCR		0x50
+#define FTGMAC100_OFFSET_MACSR		0x54
+#define FTGMAC100_OFFSET_TM		0x58
+#define FTGMAC100_OFFSET_PHYCR		0x60
+#define FTGMAC100_OFFSET_PHYDATA	0x64
+#define FTGMAC100_OFFSET_FCR		0x68
+#define FTGMAC100_OFFSET_BPR		0x6c
+#define FTGMAC100_OFFSET_WOLCR		0x70
+#define FTGMAC100_OFFSET_WOLSR		0x74
+#define FTGMAC100_OFFSET_WFCRC		0x78
+#define FTGMAC100_OFFSET_WFBM1		0x80
+#define FTGMAC100_OFFSET_WFBM2		0x84
+#define FTGMAC100_OFFSET_WFBM3		0x88
+#define FTGMAC100_OFFSET_WFBM4		0x8c
+#define FTGMAC100_OFFSET_NPTXR_PTR	0x90
+#define FTGMAC100_OFFSET_HPTXR_PTR	0x94
+#define FTGMAC100_OFFSET_RXR_PTR	0x98
+#define FTGMAC100_OFFSET_TX		0xa0
+#define FTGMAC100_OFFSET_TX_MCOL_SCOL	0xa4
+#define FTGMAC100_OFFSET_TX_ECOL_FAIL	0xa8
+#define FTGMAC100_OFFSET_TX_LCOL_UND	0xac
+#define FTGMAC100_OFFSET_RX		0xb0
+#define FTGMAC100_OFFSET_RX_BC		0xb4
+#define FTGMAC100_OFFSET_RX_MC		0xb8
+#define FTGMAC100_OFFSET_RX_PF_AEP	0xbc
+#define FTGMAC100_OFFSET_RX_RUNT	0xc0
+#define FTGMAC100_OFFSET_RX_CRCER_FTL	0xc4
+#define FTGMAC100_OFFSET_RX_COL_LOST	0xc8
+
+/*
+ * Interrupt status register & interrupt enable register
+ */
+#define FTGMAC100_INT_RPKT_BUF		(1 << 0)
+#define FTGMAC100_INT_RPKT_FIFO		(1 << 1)
+#define FTGMAC100_INT_NO_RXBUF		(1 << 2)
+#define FTGMAC100_INT_RPKT_LOST		(1 << 3)
+#define FTGMAC100_INT_XPKT_ETH		(1 << 4)
+#define FTGMAC100_INT_XPKT_FIFO		(1 << 5)
+#define FTGMAC100_INT_NO_NPTXBUF	(1 << 6)
+#define FTGMAC100_INT_XPKT_LOST		(1 << 7)
+#define FTGMAC100_INT_AHB_ERR		(1 << 8)
+#define FTGMAC100_INT_PHYSTS_CHG	(1 << 9)
+#define FTGMAC100_INT_NO_HPTXBUF	(1 << 10)
+
+/*
+ * Interrupt timer control register
+ */
+#define FTGMAC100_ITC_RXINT_CNT(x)	(((x) & 0xf) << 0)
+#define FTGMAC100_ITC_RXINT_THR(x)	(((x) & 0x7) << 4)
+#define FTGMAC100_ITC_RXINT_TIME_SEL	(1 << 7)
+#define FTGMAC100_ITC_TXINT_CNT(x)	(((x) & 0xf) << 8)
+#define FTGMAC100_ITC_TXINT_THR(x)	(((x) & 0x7) << 12)
+#define FTGMAC100_ITC_TXINT_TIME_SEL	(1 << 15)
+
+/*
+ * Automatic polling timer control register
+ */
+#define FTGMAC100_APTC_RXPOLL_CNT(x)	(((x) & 0xf) << 0)
+#define FTGMAC100_APTC_RXPOLL_TIME_SEL	(1 << 4)
+#define FTGMAC100_APTC_TXPOLL_CNT(x)	(((x) & 0xf) << 8)
+#define FTGMAC100_APTC_TXPOLL_TIME_SEL	(1 << 12)
+
+/*
+ * DMA burst length and arbitration control register
+ */
+#define FTGMAC100_DBLAC_RXFIFO_LTHR(x)	(((x) & 0x7) << 0)
+#define FTGMAC100_DBLAC_RXFIFO_HTHR(x)	(((x) & 0x7) << 3)
+#define FTGMAC100_DBLAC_RX_THR_EN	(1 << 6)
+#define FTGMAC100_DBLAC_RXBURST_SIZE(x)	(((x) & 0x3) << 8)
+#define FTGMAC100_DBLAC_TXBURST_SIZE(x)	(((x) & 0x3) << 10)
+#define FTGMAC100_DBLAC_RXDES_SIZE(x)	(((x) & 0xf) << 12)
+#define FTGMAC100_DBLAC_TXDES_SIZE(x)	(((x) & 0xf) << 16)
+#define FTGMAC100_DBLAC_IFG_CNT(x)	(((x) & 0x7) << 20)
+#define FTGMAC100_DBLAC_IFG_INC		(1 << 23)
+
+/*
+ * DMA FIFO status register
+ */
+#define FTGMAC100_DMAFIFOS_RXDMA1_SM(dmafifos)	((dmafifos) & 0xf)
+#define FTGMAC100_DMAFIFOS_RXDMA2_SM(dmafifos)	(((dmafifos) >> 4) & 0xf)
+#define FTGMAC100_DMAFIFOS_RXDMA3_SM(dmafifos)	(((dmafifos) >> 8) & 0x7)
+#define FTGMAC100_DMAFIFOS_TXDMA1_SM(dmafifos)	(((dmafifos) >> 12) & 0xf)
+#define FTGMAC100_DMAFIFOS_TXDMA2_SM(dmafifos)	(((dmafifos) >> 16) & 0x3)
+#define FTGMAC100_DMAFIFOS_TXDMA3_SM(dmafifos)	(((dmafifos) >> 18) & 0xf)
+#define FTGMAC100_DMAFIFOS_RXFIFO_EMPTY		(1 << 26)
+#define FTGMAC100_DMAFIFOS_TXFIFO_EMPTY		(1 << 27)
+#define FTGMAC100_DMAFIFOS_RXDMA_GRANT		(1 << 28)
+#define FTGMAC100_DMAFIFOS_TXDMA_GRANT		(1 << 29)
+#define FTGMAC100_DMAFIFOS_RXDMA_REQ		(1 << 30)
+#define FTGMAC100_DMAFIFOS_TXDMA_REQ		(1 << 31)
+
+/*
+ * Receive buffer size register
+ */
+#define FTGMAC100_RBSR_SIZE(x)		((x) & 0x3fff)
+
+/*
+ * MAC control register
+ */
+#define FTGMAC100_MACCR_TXDMA_EN	(1 << 0)
+#define FTGMAC100_MACCR_RXDMA_EN	(1 << 1)
+#define FTGMAC100_MACCR_TXMAC_EN	(1 << 2)
+#define FTGMAC100_MACCR_RXMAC_EN	(1 << 3)
+#define FTGMAC100_MACCR_RM_VLAN		(1 << 4)
+#define FTGMAC100_MACCR_HPTXR_EN	(1 << 5)
+#define FTGMAC100_MACCR_LOOP_EN		(1 << 6)
+#define FTGMAC100_MACCR_ENRX_IN_HALFTX	(1 << 7)
+#define FTGMAC100_MACCR_FULLDUP		(1 << 8)
+#define FTGMAC100_MACCR_GIGA_MODE	(1 << 9)
+#define FTGMAC100_MACCR_CRC_APD		(1 << 10)
+#define FTGMAC100_MACCR_RX_RUNT		(1 << 12)
+#define FTGMAC100_MACCR_JUMBO_LF	(1 << 13)
+#define FTGMAC100_MACCR_RX_ALL		(1 << 14)
+#define FTGMAC100_MACCR_HT_MULTI_EN	(1 << 15)
+#define FTGMAC100_MACCR_RX_MULTIPKT	(1 << 16)
+#define FTGMAC100_MACCR_RX_BROADPKT	(1 << 17)
+#define FTGMAC100_MACCR_DISCARD_CRCERR	(1 << 18)
+#define FTGMAC100_MACCR_FAST_MODE	(1 << 19)
+#define FTGMAC100_MACCR_SW_RST		(1 << 31)
+
+/*
+ * PHY control register
+ */
+#define FTGMAC100_PHYCR_MDC_CYCTHR_MASK	0x3f
+#define FTGMAC100_PHYCR_MDC_CYCTHR(x)	((x) & 0x3f)
+#define FTGMAC100_PHYCR_PHYAD(x)	(((x) & 0x1f) << 16)
+#define FTGMAC100_PHYCR_REGAD(x)	(((x) & 0x1f) << 21)
+#define FTGMAC100_PHYCR_MIIRD		(1 << 26)
+#define FTGMAC100_PHYCR_MIIWR		(1 << 27)
+
+/*
+ * PHY data register
+ */
+#define FTGMAC100_PHYDATA_MIIWDATA(x)		((x) & 0xffff)
+#define FTGMAC100_PHYDATA_MIIRDATA(phydata)	(((phydata) >> 16) & 0xffff)
+
+/*
+ * Transmit descriptor, aligned to 16 bytes
+ */
+struct ftgmac100_txdes {
+	unsigned int	txdes0;
+	unsigned int	txdes1;
+	unsigned int	txdes2;	/* not used by HW */
+	unsigned int	txdes3;	/* TXBUF_BADR */
+} __attribute__ ((aligned(16)));
+
+#define FTGMAC100_TXDES0_TXBUF_SIZE(x)	((x) & 0x3fff)
+#define FTGMAC100_TXDES0_EDOTR		(1 << 15)
+#define FTGMAC100_TXDES0_CRC_ERR	(1 << 19)
+#define FTGMAC100_TXDES0_LTS		(1 << 28)
+#define FTGMAC100_TXDES0_FTS		(1 << 29)
+#define FTGMAC100_TXDES0_TXDMA_OWN	(1 << 31)
+
+#define FTGMAC100_TXDES1_VLANTAG_CI(x)	((x) & 0xffff)
+#define FTGMAC100_TXDES1_INS_VLANTAG	(1 << 16)
+#define FTGMAC100_TXDES1_TCP_CHKSUM	(1 << 17)
+#define FTGMAC100_TXDES1_UDP_CHKSUM	(1 << 18)
+#define FTGMAC100_TXDES1_IP_CHKSUM	(1 << 19)
+#define FTGMAC100_TXDES1_LLC		(1 << 22)
+#define FTGMAC100_TXDES1_TX2FIC		(1 << 30)
+#define FTGMAC100_TXDES1_TXIC		(1 << 31)
+
+/*
+ * Receive descriptor, aligned to 16 bytes
+ */
+struct ftgmac100_rxdes {
+	unsigned int	rxdes0;
+	unsigned int	rxdes1;
+	unsigned int	rxdes2;	/* not used by HW */
+	unsigned int	rxdes3;	/* RXBUF_BADR */
+} __attribute__ ((aligned(16)));
+
+#define FTGMAC100_RXDES0_VDBC		0x3fff
+#define FTGMAC100_RXDES0_EDORR		(1 << 15)
+#define FTGMAC100_RXDES0_MULTICAST	(1 << 16)
+#define FTGMAC100_RXDES0_BROADCAST	(1 << 17)
+#define FTGMAC100_RXDES0_RX_ERR		(1 << 18)
+#define FTGMAC100_RXDES0_CRC_ERR	(1 << 19)
+#define FTGMAC100_RXDES0_FTL		(1 << 20)
+#define FTGMAC100_RXDES0_RUNT		(1 << 21)
+#define FTGMAC100_RXDES0_RX_ODD_NB	(1 << 22)
+#define FTGMAC100_RXDES0_FIFO_FULL	(1 << 23)
+#define FTGMAC100_RXDES0_PAUSE_OPCODE	(1 << 24)
+#define FTGMAC100_RXDES0_PAUSE_FRAME	(1 << 25)
+#define FTGMAC100_RXDES0_LRS		(1 << 28)
+#define FTGMAC100_RXDES0_FRS		(1 << 29)
+#define FTGMAC100_RXDES0_RXPKT_RDY	(1 << 31)
+
+#define FTGMAC100_RXDES1_VLANTAG_CI	0xffff
+#define FTGMAC100_RXDES1_PROT_MASK	(0x3 << 20)
+#define FTGMAC100_RXDES1_PROT_NONIP	(0x0 << 20)
+#define FTGMAC100_RXDES1_PROT_IP	(0x1 << 20)
+#define FTGMAC100_RXDES1_PROT_TCPIP	(0x2 << 20)
+#define FTGMAC100_RXDES1_PROT_UDPIP	(0x3 << 20)
+#define FTGMAC100_RXDES1_LLC		(1 << 22)
+#define FTGMAC100_RXDES1_DF		(1 << 23)
+#define FTGMAC100_RXDES1_VLANTAG_AVAIL	(1 << 24)
+#define FTGMAC100_RXDES1_TCP_CHKSUM_ERR	(1 << 25)
+#define FTGMAC100_RXDES1_UDP_CHKSUM_ERR	(1 << 26)
+#define FTGMAC100_RXDES1_IP_CHKSUM_ERR	(1 << 27)
+
+#endif /* __FTGMAC100_H */