net: add Calxeda xgmac driver

This adds ethernet driver for Calxeda xgmac found on Highbank SOC.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>

Fix: WARNING: __aligned(size) is preferred over
__attribute__((aligned(size)))
Signed-off-by: Wolfgang Denk <wd@denx.de>

2 files changed, 554 insertions, 0 deletions

diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index d3df82e..f4f7ea3 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -31,6 +31,7 @@ COBJS-$(CONFIG_ARMADA100_FEC) += armada100_fec.o
 COBJS-$(CONFIG_DRIVER_AT91EMAC) += at91_emac.o
 COBJS-$(CONFIG_DRIVER_AX88180) += ax88180.o
 COBJS-$(CONFIG_BFIN_MAC) += bfin_mac.o
+COBJS-$(CONFIG_CALXEDA_XGMAC) += calxedaxgmac.o
 COBJS-$(CONFIG_CS8900) += cs8900.o
 COBJS-$(CONFIG_TULIP) += dc2114x.o
 COBJS-$(CONFIG_DESIGNWARE_ETH) += designware.o
diff --git a/drivers/net/calxedaxgmac.c b/drivers/net/calxedaxgmac.c
new file mode 100644
index 0000000..01b2eee
--- /dev/null
+++ b/drivers/net/calxedaxgmac.c
@@ -0,0 +1,553 @@
+/*
+ * Copyright 2010-2011 Calxeda, Inc.
+ *
+ * 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 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, see <http://www.gnu.org/licenses/>.
+ */
+#include <common.h>
+#include <malloc.h>
+#include <linux/err.h>
+#include <asm/io.h>
+
+#define TX_NUM_DESC			1
+#define RX_NUM_DESC			32
+
+#define MAC_TIMEOUT			(5*CONFIG_SYS_HZ)
+
+#define ETH_BUF_SZ			2048
+#define TX_BUF_SZ			(ETH_BUF_SZ * TX_NUM_DESC)
+#define RX_BUF_SZ			(ETH_BUF_SZ * RX_NUM_DESC)
+
+#define RXSTART				0x00000002
+#define TXSTART				0x00002000
+
+#define RXENABLE			0x00000004
+#define TXENABLE			0x00000008
+
+#define XGMAC_CONTROL_SPD		0x40000000
+#define XGMAC_CONTROL_SPD_MASK		0x60000000
+#define XGMAC_CONTROL_SARC		0x10000000
+#define XGMAC_CONTROL_SARK_MASK		0x18000000
+#define XGMAC_CONTROL_CAR		0x04000000
+#define XGMAC_CONTROL_CAR_MASK		0x06000000
+#define XGMAC_CONTROL_CAR_SHIFT		25
+#define XGMAC_CONTROL_DP		0x01000000
+#define XGMAC_CONTROL_WD		0x00800000
+#define XGMAC_CONTROL_JD		0x00400000
+#define XGMAC_CONTROL_JE		0x00100000
+#define XGMAC_CONTROL_LM		0x00001000
+#define XGMAC_CONTROL_IPC		0x00000400
+#define XGMAC_CONTROL_ACS		0x00000080
+#define XGMAC_CONTROL_DDIC		0x00000010
+#define XGMAC_CONTROL_TE		0x00000008
+#define XGMAC_CONTROL_RE		0x00000004
+
+#define XGMAC_DMA_BUSMODE_RESET		0x00000001
+#define XGMAC_DMA_BUSMODE_DSL		0x00000004
+#define XGMAC_DMA_BUSMODE_DSL_MASK	0x0000007c
+#define XGMAC_DMA_BUSMODE_DSL_SHIFT	2
+#define XGMAC_DMA_BUSMODE_ATDS		0x00000080
+#define XGMAC_DMA_BUSMODE_PBL_MASK	0x00003f00
+#define XGMAC_DMA_BUSMODE_PBL_SHIFT	8
+#define XGMAC_DMA_BUSMODE_FB		0x00010000
+#define XGMAC_DMA_BUSMODE_USP		0x00800000
+#define XGMAC_DMA_BUSMODE_8PBL		0x01000000
+#define XGMAC_DMA_BUSMODE_AAL		0x02000000
+
+#define XGMAC_DMA_AXIMODE_ENLPI		0x80000000
+#define XGMAC_DMA_AXIMODE_MGK		0x40000000
+#define XGMAC_DMA_AXIMODE_WROSR		0x00100000
+#define XGMAC_DMA_AXIMODE_WROSR_MASK	0x00F00000
+#define XGMAC_DMA_AXIMODE_WROSR_SHIFT	20
+#define XGMAC_DMA_AXIMODE_RDOSR		0x00010000
+#define XGMAC_DMA_AXIMODE_RDOSR_MASK	0x000F0000
+#define XGMAC_DMA_AXIMODE_RDOSR_SHIFT	16
+#define XGMAC_DMA_AXIMODE_AAL		0x00001000
+#define XGMAC_DMA_AXIMODE_BLEN256	0x00000080
+#define XGMAC_DMA_AXIMODE_BLEN128	0x00000040
+#define XGMAC_DMA_AXIMODE_BLEN64	0x00000020
+#define XGMAC_DMA_AXIMODE_BLEN32	0x00000010
+#define XGMAC_DMA_AXIMODE_BLEN16	0x00000008
+#define XGMAC_DMA_AXIMODE_BLEN8		0x00000004
+#define XGMAC_DMA_AXIMODE_BLEN4		0x00000002
+#define XGMAC_DMA_AXIMODE_UNDEF		0x00000001
+
+#define XGMAC_CORE_OMR_RTC_SHIFT	3
+#define XGMAC_CORE_OMR_RTC_MASK		0x00000018
+#define XGMAC_CORE_OMR_RTC		0x00000010
+#define XGMAC_CORE_OMR_RSF		0x00000020
+#define XGMAC_CORE_OMR_DT		0x00000040
+#define XGMAC_CORE_OMR_FEF		0x00000080
+#define XGMAC_CORE_OMR_EFC		0x00000100
+#define XGMAC_CORE_OMR_RFA_SHIFT	9
+#define XGMAC_CORE_OMR_RFA_MASK		0x00000E00
+#define XGMAC_CORE_OMR_RFD_SHIFT	12
+#define XGMAC_CORE_OMR_RFD_MASK		0x00007000
+#define XGMAC_CORE_OMR_TTC_SHIFT	16
+#define XGMAC_CORE_OMR_TTC_MASK		0x00030000
+#define XGMAC_CORE_OMR_TTC		0x00020000
+#define XGMAC_CORE_OMR_FTF		0x00100000
+#define XGMAC_CORE_OMR_TSF		0x00200000
+
+#define FIFO_MINUS_1K			0x0
+#define FIFO_MINUS_2K			0x1
+#define FIFO_MINUS_3K			0x2
+#define FIFO_MINUS_4K			0x3
+#define FIFO_MINUS_6K			0x4
+#define FIFO_MINUS_8K			0x5
+#define FIFO_MINUS_12K			0x6
+#define FIFO_MINUS_16K			0x7
+
+#define XGMAC_CORE_FLOW_PT_SHIFT	16
+#define XGMAC_CORE_FLOW_PT_MASK		0xFFFF0000
+#define XGMAC_CORE_FLOW_PT		0x00010000
+#define XGMAC_CORE_FLOW_DZQP		0x00000080
+#define XGMAC_CORE_FLOW_PLT_SHIFT	4
+#define XGMAC_CORE_FLOW_PLT_MASK	0x00000030
+#define XGMAC_CORE_FLOW_PLT		0x00000010
+#define XGMAC_CORE_FLOW_UP		0x00000008
+#define XGMAC_CORE_FLOW_RFE		0x00000004
+#define XGMAC_CORE_FLOW_TFE		0x00000002
+#define XGMAC_CORE_FLOW_FCB		0x00000001
+
+/* XGMAC Descriptor Defines */
+#define MAX_DESC_BUF_SZ			(0x2000 - 8)
+
+#define RXDESC_EXT_STATUS		0x00000001
+#define RXDESC_CRC_ERR			0x00000002
+#define RXDESC_RX_ERR			0x00000008
+#define RXDESC_RX_WDOG			0x00000010
+#define RXDESC_FRAME_TYPE		0x00000020
+#define RXDESC_GIANT_FRAME		0x00000080
+#define RXDESC_LAST_SEG			0x00000100
+#define RXDESC_FIRST_SEG		0x00000200
+#define RXDESC_VLAN_FRAME		0x00000400
+#define RXDESC_OVERFLOW_ERR		0x00000800
+#define RXDESC_LENGTH_ERR		0x00001000
+#define RXDESC_SA_FILTER_FAIL		0x00002000
+#define RXDESC_DESCRIPTOR_ERR		0x00004000
+#define RXDESC_ERROR_SUMMARY		0x00008000
+#define RXDESC_FRAME_LEN_OFFSET		16
+#define RXDESC_FRAME_LEN_MASK		0x3fff0000
+#define RXDESC_DA_FILTER_FAIL		0x40000000
+
+#define RXDESC1_END_RING		0x00008000
+
+#define RXDESC_IP_PAYLOAD_MASK		0x00000003
+#define RXDESC_IP_PAYLOAD_UDP		0x00000001
+#define RXDESC_IP_PAYLOAD_TCP		0x00000002
+#define RXDESC_IP_PAYLOAD_ICMP		0x00000003
+#define RXDESC_IP_HEADER_ERR		0x00000008
+#define RXDESC_IP_PAYLOAD_ERR		0x00000010
+#define RXDESC_IPV4_PACKET		0x00000040
+#define RXDESC_IPV6_PACKET		0x00000080
+#define TXDESC_UNDERFLOW_ERR		0x00000001
+#define TXDESC_JABBER_TIMEOUT		0x00000002
+#define TXDESC_LOCAL_FAULT		0x00000004
+#define TXDESC_REMOTE_FAULT		0x00000008
+#define TXDESC_VLAN_FRAME		0x00000010
+#define TXDESC_FRAME_FLUSHED		0x00000020
+#define TXDESC_IP_HEADER_ERR		0x00000040
+#define TXDESC_PAYLOAD_CSUM_ERR		0x00000080
+#define TXDESC_ERROR_SUMMARY		0x00008000
+#define TXDESC_SA_CTRL_INSERT		0x00040000
+#define TXDESC_SA_CTRL_REPLACE		0x00080000
+#define TXDESC_2ND_ADDR_CHAINED		0x00100000
+#define TXDESC_END_RING			0x00200000
+#define TXDESC_CSUM_IP			0x00400000
+#define TXDESC_CSUM_IP_PAYLD		0x00800000
+#define TXDESC_CSUM_ALL			0x00C00000
+#define TXDESC_CRC_EN_REPLACE		0x01000000
+#define TXDESC_CRC_EN_APPEND		0x02000000
+#define TXDESC_DISABLE_PAD		0x04000000
+#define TXDESC_FIRST_SEG		0x10000000
+#define TXDESC_LAST_SEG			0x20000000
+#define TXDESC_INTERRUPT		0x40000000
+
+#define DESC_OWN			0x80000000
+#define DESC_BUFFER1_SZ_MASK		0x00001fff
+#define DESC_BUFFER2_SZ_MASK		0x1fff0000
+#define DESC_BUFFER2_SZ_OFFSET		16
+
+struct xgmac_regs {
+	u32 config;
+	u32 framefilter;
+	u32 resv_1[4];
+	u32 flow_control;
+	u32 vlantag;
+	u32 version;
+	u32 vlaninclude;
+	u32 resv_2[2];
+	u32 pacestretch;
+	u32 vlanhash;
+	u32 resv_3;
+	u32 intreg;
+	struct {
+		u32 hi;         /* 0x40 */
+		u32 lo;         /* 0x44 */
+	} macaddr[16];
+	u32 resv_4[0xd0];
+	u32 core_opmode;	/* 0x400 */
+	u32 resv_5[0x2bf];
+	u32 busmode;		/* 0xf00 */
+	u32 txpoll;
+	u32 rxpoll;
+	u32 rxdesclist;
+	u32 txdesclist;
+	u32 dma_status;
+	u32 dma_opmode;
+	u32 intenable;
+	u32 resv_6[2];
+	u32 axi_mode;		/* 0xf28 */
+};
+
+struct xgmac_dma_desc {
+	__le32 flags;
+	__le32 buf_size;
+	__le32 buf1_addr;		/* Buffer 1 Address Pointer */
+	__le32 buf2_addr;		/* Buffer 2 Address Pointer */
+	__le32 ext_status;
+	__le32 res[3];
+};
+
+/* XGMAC Descriptor Access Helpers */
+static inline void desc_set_buf_len(struct xgmac_dma_desc *p, u32 buf_sz)
+{
+	if (buf_sz > MAX_DESC_BUF_SZ)
+		p->buf_size = cpu_to_le32(MAX_DESC_BUF_SZ |
+			(buf_sz - MAX_DESC_BUF_SZ) << DESC_BUFFER2_SZ_OFFSET);
+	else
+		p->buf_size = cpu_to_le32(buf_sz);
+}
+
+static inline int desc_get_buf_len(struct xgmac_dma_desc *p)
+{
+	u32 len = le32_to_cpu(p->buf_size);
+	return (len & DESC_BUFFER1_SZ_MASK) +
+		((len & DESC_BUFFER2_SZ_MASK) >> DESC_BUFFER2_SZ_OFFSET);
+}
+
+static inline void desc_init_rx_desc(struct xgmac_dma_desc *p, int ring_size,
+				     int buf_sz)
+{
+	struct xgmac_dma_desc *end = p + ring_size - 1;
+
+	memset(p, 0, sizeof(*p) * ring_size);
+
+	for (; p <= end; p++)
+		desc_set_buf_len(p, buf_sz);
+
+	end->buf_size |= cpu_to_le32(RXDESC1_END_RING);
+}
+
+static inline void desc_init_tx_desc(struct xgmac_dma_desc *p, u32 ring_size)
+{
+	memset(p, 0, sizeof(*p) * ring_size);
+	p[ring_size - 1].flags = cpu_to_le32(TXDESC_END_RING);
+}
+
+static inline int desc_get_owner(struct xgmac_dma_desc *p)
+{
+	return le32_to_cpu(p->flags) & DESC_OWN;
+}
+
+static inline void desc_set_rx_owner(struct xgmac_dma_desc *p)
+{
+	/* Clear all fields and set the owner */
+	p->flags = cpu_to_le32(DESC_OWN);
+}
+
+static inline void desc_set_tx_owner(struct xgmac_dma_desc *p, u32 flags)
+{
+	u32 tmpflags = le32_to_cpu(p->flags);
+	tmpflags &= TXDESC_END_RING;
+	tmpflags |= flags | DESC_OWN;
+	p->flags = cpu_to_le32(tmpflags);
+}
+
+static inline void *desc_get_buf_addr(struct xgmac_dma_desc *p)
+{
+	return (void *)le32_to_cpu(p->buf1_addr);
+}
+
+static inline void desc_set_buf_addr(struct xgmac_dma_desc *p,
+				     void *paddr, int len)
+{
+	p->buf1_addr = cpu_to_le32(paddr);
+	if (len > MAX_DESC_BUF_SZ)
+		p->buf2_addr = cpu_to_le32(paddr + MAX_DESC_BUF_SZ);
+}
+
+static inline void desc_set_buf_addr_and_size(struct xgmac_dma_desc *p,
+					      void *paddr, int len)
+{
+	desc_set_buf_len(p, len);
+	desc_set_buf_addr(p, paddr, len);
+}
+
+static inline int desc_get_rx_frame_len(struct xgmac_dma_desc *p)
+{
+	u32 data = le32_to_cpu(p->flags);
+	u32 len = (data & RXDESC_FRAME_LEN_MASK) >> RXDESC_FRAME_LEN_OFFSET;
+	if (data & RXDESC_FRAME_TYPE)
+		len -= 4;
+
+	return len;
+}
+
+struct calxeda_eth_dev {
+	struct xgmac_dma_desc rx_chain[RX_NUM_DESC];
+	struct xgmac_dma_desc tx_chain[TX_NUM_DESC];
+	char rxbuffer[RX_BUF_SZ];
+
+	u32 tx_currdesc;
+	u32 rx_currdesc;
+
+	struct eth_device *dev;
+} __aligned(32);
+
+/*
+ * Initialize a descriptor ring.  Calxeda XGMAC is configured to use
+ * advanced descriptors.
+ */
+
+static void init_rx_desc(struct calxeda_eth_dev *priv)
+{
+	struct xgmac_dma_desc *rxdesc = priv->rx_chain;
+	struct xgmac_regs *regs = (struct xgmac_regs *)priv->dev->iobase;
+	void *rxbuffer = priv->rxbuffer;
+	int i;
+
+	desc_init_rx_desc(rxdesc, RX_NUM_DESC, ETH_BUF_SZ);
+	writel((ulong)rxdesc, &regs->rxdesclist);
+
+	for (i = 0; i < RX_NUM_DESC; i++) {
+		desc_set_buf_addr(rxdesc + i, rxbuffer + (i * ETH_BUF_SZ),
+				  ETH_BUF_SZ);
+		desc_set_rx_owner(rxdesc + i);
+	}
+}
+
+static void init_tx_desc(struct calxeda_eth_dev *priv)
+{
+	struct xgmac_regs *regs = (struct xgmac_regs *)priv->dev->iobase;
+
+	desc_init_tx_desc(priv->tx_chain, TX_NUM_DESC);
+	writel((ulong)priv->tx_chain, &regs->txdesclist);
+}
+
+static int xgmac_reset(struct eth_device *dev)
+{
+	struct xgmac_regs *regs = (struct xgmac_regs *)dev->iobase;
+	int timeout = MAC_TIMEOUT;
+	u32 value;
+
+	value = readl(&regs->config) & XGMAC_CONTROL_SPD_MASK;
+
+	writel(XGMAC_DMA_BUSMODE_RESET, &regs->busmode);
+	while ((timeout-- >= 0) &&
+		(readl(&regs->busmode) & XGMAC_DMA_BUSMODE_RESET))
+		udelay(1);
+
+	writel(value, &regs->config);
+
+	return timeout;
+}
+
+static void xgmac_hwmacaddr(struct eth_device *dev)
+{
+	struct xgmac_regs *regs = (struct xgmac_regs *)dev->iobase;
+	u32 macaddr[2];
+
+	memcpy(macaddr, dev->enetaddr, 6);
+	writel(macaddr[1], &regs->macaddr[0].hi);
+	writel(macaddr[0], &regs->macaddr[0].lo);
+}
+
+static int xgmac_init(struct eth_device *dev, bd_t * bis)
+{
+	struct xgmac_regs *regs = (struct xgmac_regs *)dev->iobase;
+	struct calxeda_eth_dev *priv = dev->priv;
+	int value;
+
+	if (xgmac_reset(dev) < 0)
+		return -1;
+
+	/* set the hardware MAC address */
+	xgmac_hwmacaddr(dev);
+
+	/* set the AXI bus modes */
+	value = XGMAC_DMA_BUSMODE_ATDS |
+		(16 << XGMAC_DMA_BUSMODE_PBL_SHIFT) |
+		XGMAC_DMA_BUSMODE_FB | XGMAC_DMA_BUSMODE_AAL;
+	writel(value, &regs->busmode);
+
+	value = XGMAC_DMA_AXIMODE_AAL | XGMAC_DMA_AXIMODE_BLEN16 |
+		XGMAC_DMA_AXIMODE_BLEN8 | XGMAC_DMA_AXIMODE_BLEN4;
+	writel(value, &regs->axi_mode);
+
+	/* set flow control parameters and store and forward mode */
+	value = (FIFO_MINUS_12K << XGMAC_CORE_OMR_RFD_SHIFT) |
+		(FIFO_MINUS_4K << XGMAC_CORE_OMR_RFA_SHIFT) |
+		XGMAC_CORE_OMR_EFC | XGMAC_CORE_OMR_TSF | XGMAC_CORE_OMR_RSF;
+	writel(value, &regs->core_opmode);
+
+	/* enable pause frames */
+	value = (1024 << XGMAC_CORE_FLOW_PT_SHIFT) |
+		(1 << XGMAC_CORE_FLOW_PLT_SHIFT) |
+		XGMAC_CORE_FLOW_UP | XGMAC_CORE_FLOW_RFE | XGMAC_CORE_FLOW_TFE;
+	writel(value, &regs->flow_control);
+
+	/* Initialize the descriptor chains */
+	init_rx_desc(priv);
+	init_tx_desc(priv);
+
+	/* must set to 0, or when started up will cause issues */
+	priv->tx_currdesc = 0;
+	priv->rx_currdesc = 0;
+
+	/* set default core values */
+	value = readl(&regs->config);
+	value &= XGMAC_CONTROL_SPD_MASK;
+	value |= XGMAC_CONTROL_DDIC | XGMAC_CONTROL_ACS |
+		XGMAC_CONTROL_IPC | XGMAC_CONTROL_CAR;
+
+	/* Everything is ready enable both mac and DMA */
+	value |= RXENABLE | TXENABLE;
+	writel(value, &regs->config);
+
+	value = readl(&regs->dma_opmode);
+	value |= RXSTART | TXSTART;
+	writel(value, &regs->dma_opmode);
+
+	return 0;
+}
+
+static int xgmac_tx(struct eth_device *dev, volatile void *packet, int length)
+{
+	struct xgmac_regs *regs = (struct xgmac_regs *)dev->iobase;
+	struct calxeda_eth_dev *priv = dev->priv;
+	u32 currdesc = priv->tx_currdesc;
+	struct xgmac_dma_desc *txdesc = &priv->tx_chain[currdesc];
+	int timeout;
+
+	desc_set_buf_addr_and_size(txdesc, (void *)packet, length);
+	desc_set_tx_owner(txdesc, TXDESC_FIRST_SEG |
+		TXDESC_LAST_SEG | TXDESC_CRC_EN_APPEND);
+
+	/* write poll demand */
+	writel(1, &regs->txpoll);
+
+	timeout = 1000000;
+	while (desc_get_owner(txdesc)) {
+		if (timeout-- < 0) {
+			printf("xgmac: TX timeout\n");
+			return -ETIMEDOUT;
+		}
+		udelay(1);
+	}
+
+	priv->tx_currdesc = (currdesc + 1) & (TX_NUM_DESC - 1);
+	return 0;
+}
+
+static int xgmac_rx(struct eth_device *dev)
+{
+	struct xgmac_regs *regs = (struct xgmac_regs *)dev->iobase;
+	struct calxeda_eth_dev *priv = dev->priv;
+	u32 currdesc = priv->rx_currdesc;
+	struct xgmac_dma_desc *rxdesc = &priv->rx_chain[currdesc];
+	int length = 0;
+
+	/* check if the host has the desc */
+	if (desc_get_owner(rxdesc))
+		return -1; /* something bad happened */
+
+	length = desc_get_rx_frame_len(rxdesc);
+
+	NetReceive((volatile unsigned char *)desc_get_buf_addr(rxdesc), length);
+
+	/* set descriptor back to owned by XGMAC */
+	desc_set_rx_owner(rxdesc);
+	writel(1, &regs->rxpoll);
+
+	priv->rx_currdesc = (currdesc + 1) & (RX_NUM_DESC - 1);
+
+	return length;
+}
+
+static void xgmac_halt(struct eth_device *dev)
+{
+	struct xgmac_regs *regs = (struct xgmac_regs *)dev->iobase;
+	struct calxeda_eth_dev *priv = dev->priv;
+	int value;
+
+	/* Disable TX/RX */
+	value = readl(&regs->config);
+	value &= ~(RXENABLE | TXENABLE);
+	writel(value, &regs->config);
+
+	/* Disable DMA */
+	value = readl(&regs->dma_opmode);
+	value &= ~(RXSTART | TXSTART);
+	writel(value, &regs->dma_opmode);
+
+	/* must set to 0, or when started up will cause issues */
+	priv->tx_currdesc = 0;
+	priv->rx_currdesc = 0;
+}
+
+int calxedaxgmac_initialize(u32 id, ulong base_addr)
+{
+	struct eth_device *dev;
+	struct calxeda_eth_dev *priv;
+	struct xgmac_regs *regs;
+	u32 macaddr[2];
+
+	regs = (struct xgmac_regs *)base_addr;
+
+	/* check hardware version */
+	if (readl(&regs->version) != 0x1012)
+		return -1;
+
+	dev = malloc(sizeof(*dev));
+	if (!dev)
+		return 0;
+	memset(dev, 0, sizeof(*dev));
+
+	/* Structure must be aligned, because it contains the descriptors */
+	priv = memalign(32, sizeof(*priv));
+	if (!priv) {
+		free(dev);
+		return 0;
+	}
+
+	dev->iobase = (int)base_addr;
+	dev->priv = priv;
+	priv->dev = dev;
+	sprintf(dev->name, "xgmac%d", id);
+
+	/* The MAC address is already configured, so read it from registers. */
+	macaddr[1] = readl(&regs->macaddr[0].hi);
+	macaddr[0] = readl(&regs->macaddr[0].lo);
+	memcpy(dev->enetaddr, macaddr, 6);
+
+	dev->init = xgmac_init;
+	dev->send = xgmac_tx;
+	dev->recv = xgmac_rx;
+	dev->halt = xgmac_halt;
+
+	eth_register(dev);
+
+	return 1;
+}