Subject: Re: [patch 2/7] Blackfin: on-chip ethernet MAC controller driver

From: Bryan Wu <[email-masked]>
Date: Tue, 10 Jul 2007 11:05:53 +0800

On Mon, 2007-07-09 at 15:14 -0400, Sinan Akman wrote:
> [email-masked] wrote:
> 
> >From: "Wu, Bryan" <[email-masked]>
> >
> >This patch implements the driver necessary use the Analog Devices
> >Blackfin processor's on-chip ethernet MAC controller.
> >
> >Signed-off-by: Bryan Wu <[email-masked]>
> >Cc: Jeff Garzik <[email-masked]>
> >Signed-off-by: Andrew Morton <[email-masked]>
> >---
> >
> > drivers/net/Kconfig    |   44 +
> > drivers/net/Makefile   |    1 
> > drivers/net/bfin_mac.c |  981 +++++++++++++++++++++++++++++++++++++++
> > drivers/net/bfin_mac.h |  147 +++++
> > 4 files changed, 1173 insertions(+)
> >
> >diff -puN drivers/net/Kconfig~blackfin-on-chip-ethernet-mac-controller-driver drivers/net/Kconfig
> >--- a/drivers/net/Kconfig~blackfin-on-chip-ethernet-mac-controller-driver
> >+++ a/drivers/net/Kconfig
> >@@ -821,6 +821,50 @@ config ULTRA32
> > 	  <file:Documentation/networking/net-modules.txt>. The module
> > 	  will be called smc-ultra32.
> > 
> >+config BFIN_MAC
> >+	tristate "Blackfin 536/537 on-chip mac support"
> >+	depends on NET_ETHERNET && (BF537 || BF536) && (!BF537_PORT_H)
> >+	select CRC32
> >+	select BFIN_MAC_USE_L1 if DMA_UNCACHED_NONE
> >+	help
> >+	  This is the driver for blackfin on-chip mac device. Say Y if you want it
> >+	  compiled into the kernel. This driver is also available as a module
> >+	  ( = code which can be inserted in and removed from the running kernel
> >+	  whenever you want). The module will be called bfin_mac.
> >+
> >+config BFIN_MAC_USE_L1
> >+	bool "Use L1 memory for rx/tx packets"
> >+	depends on BFIN_MAC && BF537
> >+	default y
> >+	help
> >+	  To get maximum network performace, you should use L1 memory as rx/tx buffers.
> >+	  Say N here if you want to reserve L1 memory for other uses.
> >+
> >+config BFIN_TX_DESC_NUM
> >+	int "Number of transmit buffer packets"
> >+	depends on BFIN_MAC
> >+	range 6 10 if BFIN_MAC_USE_L1
> >+	range 10 100
> >+	default "10"
> >+	help
> >+	  Set the number of buffer packets used in driver.
> >+
> >+config BFIN_RX_DESC_NUM
> >+	int "Number of receive buffer packets"
> >+	depends on BFIN_MAC
> >+	range 20 100 if BFIN_MAC_USE_L1
> >+	range 20 800
> >+	default "20"
> >+	help
> >+	  Set the number of buffer packets used in driver.
> >+
> >+config BFIN_MAC_RMII
> >+	bool "RMII PHY Interface (EXPERIMENTAL)"
> >+	depends on BFIN_MAC && EXPERIMENTAL
> >+	default n
> >+	help
> >+	  Use Reduced PHY MII Interface
> >+
> > config SMC9194
> > 	tristate "SMC 9194 support"
> > 	depends on NET_VENDOR_SMC && (ISA || MAC && BROKEN)
> >diff -puN drivers/net/Makefile~blackfin-on-chip-ethernet-mac-controller-driver drivers/net/Makefile
> >--- a/drivers/net/Makefile~blackfin-on-chip-ethernet-mac-controller-driver
> >+++ a/drivers/net/Makefile
> >@@ -195,6 +195,7 @@ obj-$(CONFIG_S2IO) += s2io.o
> > obj-$(CONFIG_MYRI10GE) += myri10ge/
> > obj-$(CONFIG_SMC91X) += smc91x.o
> > obj-$(CONFIG_SMC911X) += smc911x.o
> >+obj-$(CONFIG_BFIN_MAC) += bfin_mac.o
> > obj-$(CONFIG_DM9000) += dm9000.o
> > obj-$(CONFIG_FEC_8XX) += fec_8xx/
> > obj-$(CONFIG_PASEMI_MAC) += pasemi_mac.o
> >diff -puN /dev/null drivers/net/bfin_mac.c
> >--- /dev/null
> >+++ a/drivers/net/bfin_mac.c
> >@@ -0,0 +1,981 @@
> >+/*
> >+ * File:         drivers/net/bfin_mac.c
> >+ * Based on:
> >+ * Author:       Luke Yang <[email-masked]>
> >+ *
> >+ * Created:
> >+ * Description:
> >+ *
> >+ * Modified:
> >+ *               Copyright 2004-2006 Analog Devices Inc.
> >+ *
> >+ * Bugs:         Enter bugs at http://blackfin.uclinux.org/
> >+ *
> >+ * 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, 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 ;  see the file COPYING.
> >+ * If not, write to the Free Software Foundation,
> >+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
> >+ */
> >+
> >+#include <linux/init.h>
> >+#include <linux/module.h>
> >+#include <linux/kernel.h>
> >+#include <linux/sched.h>
> >+#include <linux/slab.h>
> >+#include <linux/delay.h>
> >+#include <linux/timer.h>
> >+#include <linux/errno.h>
> >+#include <linux/ioport.h>
> >+#include <linux/crc32.h>
> >+#include <linux/device.h>
> >+#include <linux/spinlock.h>
> >+#include <linux/ethtool.h>
> >+#include <linux/mii.h>
> >+
> >+#include <linux/netdevice.h>
> >+#include <linux/etherdevice.h>
> >+#include <linux/skbuff.h>
> >+
> >+#include <linux/platform_device.h>
> >+#include <linux/netdevice.h>
> >+#include <linux/etherdevice.h>
> >+#include <linux/skbuff.h>
> >+
> >+#include <asm/io.h>
> >+#include <asm/irq.h>
> >+#include <asm/dma.h>
> >+#include <linux/dma-mapping.h>
> >+
> >+#include <asm/irq.h>
> >+#include <asm/blackfin.h>
> >+#include <asm/delay.h>
> >  
> >
>   Something very minor, but are
> netdevice.h, etherdevice.h etc
> being included here twice ?
> 

Thanks, Sinan.

I am packing up all patches for current merge window.
This driver will be resent with you guys' review.

-Bryan Wu

> >+
> >+#include "bfin_mac.h"
> >+
> >+#define CARDNAME "bfin_mac"
> >+
> >+MODULE_LICENSE("GPL");
> >+MODULE_AUTHOR("Luke Yang");
> >+MODULE_DESCRIPTION("Blackfin MAC Driver");
> >+
> >+#if defined(CONFIG_BFIN_MAC_USE_L1)
> >+# define bfin_mac_alloc(dma_handle, size)  l1_data_sram_zalloc(size)
> >+# define bfin_mac_free(dma_handle, ptr)    l1_data_sram_free(ptr)
> >+#else
> >+# define bfin_mac_alloc(dma_handle, size)  dma_alloc_coherent(NULL, size, dma_handle, GFP_DMA)
> >+# define bfin_mac_free(dma_handle, ptr)    dma_free_coherent(NULL, sizeof(*ptr), ptr, dma_handle)
> >+#endif
> >+
> >+#define PKT_BUF_SZ 1580
> >+
> >+static void desc_list_free(void);
> >+
> >+/* pointers to maintain transmit list */
> >+static struct net_dma_desc_tx *tx_list_head;
> >+static struct net_dma_desc_tx *tx_list_tail;
> >+static struct net_dma_desc_rx *rx_list_head;
> >+static struct net_dma_desc_rx *rx_list_tail;
> >+static struct net_dma_desc_rx *current_rx_ptr;
> >+static struct net_dma_desc_tx *current_tx_ptr;
> >+static struct net_dma_desc_tx *tx_desc;
> >+static struct net_dma_desc_rx *rx_desc;
> >+
> >+static int desc_list_init(void)
> >+{
> >+	struct net_dma_desc_tx *tmp_desc_tx;
> >+	struct net_dma_desc_rx *tmp_desc_rx;
> >+	int i;
> >+	struct sk_buff *new_skb;
> >+#if !defined(CONFIG_BFIN_MAC_USE_L1)
> >+	dma_addr_t dma_handle;
> >+#endif
> >+
> >+	tx_desc =
> >+	    bfin_mac_alloc(&dma_handle,
> >+			   sizeof(struct net_dma_desc_tx) *
> >+			   CONFIG_BFIN_TX_DESC_NUM);
> >+	if (tx_desc == NULL)
> >+		goto init_error;
> >+
> >+	rx_desc =
> >+	    bfin_mac_alloc(&dma_handle,
> >+			   sizeof(struct net_dma_desc_rx) *
> >+			   CONFIG_BFIN_RX_DESC_NUM);
> >+	if (rx_desc == NULL)
> >+		goto init_error;
> >+
> >+	/* init tx_list */
> >+	for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) {
> >+
> >+		tmp_desc_tx = tx_desc + i;
> >+
> >+		if (i == 0) {
> >+			tx_list_head = tmp_desc_tx;
> >+			tx_list_tail = tmp_desc_tx;
> >+		}
> >+
> >+		tmp_desc_tx->desc_a.start_addr =
> >+		    (unsigned long)tmp_desc_tx->packet;
> >+		tmp_desc_tx->desc_a.x_count = 0;
> >+		tmp_desc_tx->desc_a.config.b_DMA_EN = 0;	/* disabled */
> >+		tmp_desc_tx->desc_a.config.b_WNR = 0;		/* read from memory */
> >+		tmp_desc_tx->desc_a.config.b_WDSIZE = 2;	/* wordsize is 32 bits */
> >+		tmp_desc_tx->desc_a.config.b_NDSIZE = 6;	/* 6 half words is desc size. */
> >+		tmp_desc_tx->desc_a.config.b_FLOW = 7;		/* large desc flow */
> >+		tmp_desc_tx->desc_a.next_dma_desc = &(tmp_desc_tx->desc_b);
> >+
> >+		tmp_desc_tx->desc_b.start_addr =
> >+		    (unsigned long)(&(tmp_desc_tx->status));
> >+		tmp_desc_tx->desc_b.x_count = 0;
> >+		tmp_desc_tx->desc_b.config.b_DMA_EN = 1;	/* enabled */
> >+		tmp_desc_tx->desc_b.config.b_WNR = 1;		/* write to memory */
> >+		tmp_desc_tx->desc_b.config.b_WDSIZE = 2;	/* wordsize is 32 bits */
> >+		tmp_desc_tx->desc_b.config.b_DI_EN = 0;		/* disable interrupt */
> >+		tmp_desc_tx->desc_b.config.b_NDSIZE = 6;
> >+		tmp_desc_tx->desc_b.config.b_FLOW = 7;		/* stop mode */
> >+		tmp_desc_tx->skb = NULL;
> >+		tx_list_tail->desc_b.next_dma_desc = &(tmp_desc_tx->desc_a);
> >+		tx_list_tail->next = tmp_desc_tx;
> >+
> >+		tx_list_tail = tmp_desc_tx;
> >+	}
> >+	tx_list_tail->next = tx_list_head;	/* tx_list is a circle */
> >+	tx_list_tail->desc_b.next_dma_desc = &(tx_list_head->desc_a);
> >+	current_tx_ptr = tx_list_head;
> >+
> >+	/* init rx_list */
> >+	for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) {
> >+
> >+		tmp_desc_rx = rx_desc + i;
> >+
> >+		if (i == 0) {
> >+			rx_list_head = tmp_desc_rx;
> >+			rx_list_tail = tmp_desc_rx;
> >+		}
> >+
> >+		/* allocat a new skb for next time receive */
> >+		new_skb = dev_alloc_skb(PKT_BUF_SZ + 2);
> >+		if (!new_skb) {
> >+			printk(KERN_NOTICE CARDNAME
> >+			       ": init: low on mem - packet dropped\n");
> >+			goto init_error;
> >+		}
> >+		skb_reserve(new_skb, 2);
> >+		tmp_desc_rx->skb = new_skb;
> >+		/* since RXDWA is enabled */
> >+		tmp_desc_rx->desc_a.start_addr =
> >+		    (unsigned long)new_skb->data - 2;
> >+		tmp_desc_rx->desc_a.x_count = 0;
> >+		tmp_desc_rx->desc_a.config.b_DMA_EN = 1;	/* enabled */
> >+		tmp_desc_rx->desc_a.config.b_WNR = 1;		/* Write to memory */
> >+		tmp_desc_rx->desc_a.config.b_WDSIZE = 2;	/* wordsize is 32 bits */
> >+		tmp_desc_rx->desc_a.config.b_NDSIZE = 6;	/* 6 half words is desc size. */
> >+		tmp_desc_rx->desc_a.config.b_FLOW = 7;		/* large desc flow */
> >+		tmp_desc_rx->desc_a.next_dma_desc = &(tmp_desc_rx->desc_b);
> >+
> >+		tmp_desc_rx->desc_b.start_addr =
> >+		    (unsigned long)(&(tmp_desc_rx->status));
> >+		tmp_desc_rx->desc_b.x_count = 0;
> >+		tmp_desc_rx->desc_b.config.b_DMA_EN = 1;	/* enabled */
> >+		tmp_desc_rx->desc_b.config.b_WNR = 1;		/* Write to memory */
> >+		tmp_desc_rx->desc_b.config.b_WDSIZE = 2;	/* wordsize is 32 bits */
> >+		tmp_desc_rx->desc_b.config.b_NDSIZE = 6;
> >+		tmp_desc_rx->desc_b.config.b_DI_EN = 1;		/* enable interrupt */
> >+		tmp_desc_rx->desc_b.config.b_FLOW = 7;		/* large mode */
> >+		rx_list_tail->desc_b.next_dma_desc = &(tmp_desc_rx->desc_a);
> >+
> >+		rx_list_tail->next = tmp_desc_rx;
> >+		rx_list_tail = tmp_desc_rx;
> >+	}
> >+	rx_list_tail->next = rx_list_head;	/* rx_list is a circle */
> >+	rx_list_tail->desc_b.next_dma_desc = &(rx_list_head->desc_a);
> >+	current_rx_ptr = rx_list_head;
> >+
> >+	return 0;
> >+
> >+      init_error:
> >+	desc_list_free();
> >+	printk(KERN_ERR CARDNAME ": kmalloc failed\n");
> >+	return -ENOMEM;
> >+}
> >+
> >+static void desc_list_free(void)
> >+{
> >+	struct net_dma_desc_rx *tmp_desc_rx;
> >+	struct net_dma_desc_tx *tmp_desc_tx;
> >+	int i;
> >+#if !defined(CONFIG_BFIN_MAC_USE_L1)
> >+	dma_addr_t dma_handle = 0;
> >+#endif
> >+
> >+	if (tx_desc != NULL) {
> >+		tmp_desc_tx = tx_list_head;
> >+		for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) {
> >+			if (tmp_desc_tx != NULL) {
> >+				if (tmp_desc_tx->skb) {
> >+					dev_kfree_skb(tmp_desc_tx->skb);
> >+					tmp_desc_tx->skb = NULL;
> >+				}
> >+
> >+			}
> >+			tmp_desc_tx = tmp_desc_tx->next;
> >+		}
> >+		bfin_mac_free(dma_handle, tx_desc);
> >+	}
> >+
> >+	if (rx_desc != NULL) {
> >+		tmp_desc_rx = rx_list_head;
> >+		for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) {
> >+			if (tmp_desc_rx != NULL) {
> >+				if (tmp_desc_rx->skb) {
> >+					dev_kfree_skb(tmp_desc_rx->skb);
> >+					tmp_desc_rx->skb = NULL;
> >+				}
> >+			}
> >+			tmp_desc_rx = tmp_desc_rx->next;
> >+		}
> >+		bfin_mac_free(dma_handle, rx_desc);
> >+	}
> >+}
> >+
> >+/*---PHY CONTROL AND CONFIGURATION-----------------------------------------*/
> >+
> >+/* Set FER regs to MUX in Ethernet pins */
> >+static void setup_pin_mux(void)
> >+{
> >+	unsigned int fer_val;
> >+
> >+	/*
> >+	 * FER reg bug work-around
> >+	 * read it once
> >+	 */
> >+	fer_val = bfin_read_PORTH_FER();
> >+
> >+#if defined(CONFIG_BFIN_MAC_RMII)
> >+	fer_val = 0xC373;
> >+#else
> >+	fer_val = 0xffff;
> >+#endif
> >+	/* write it twice to the same value */
> >+
> >+	bfin_write_PORTH_FER(fer_val);
> >+	bfin_write_PORTH_FER(fer_val);
> >+}
> >+
> >+/* Wait until the previous MDC/MDIO transaction has completed */
> >+static void poll_mdc_done(void)
> >+{
> >+	/* poll the STABUSY bit */
> >+	while ((bfin_read_EMAC_STAADD()) & STABUSY) {
> >+	};
> >+}
> >+
> >+/* Read an off-chip register in a PHY through the MDC/MDIO port */
> >+static u16 read_phy_reg(u16 PHYAddr, u16 RegAddr)
> >+{
> >+	poll_mdc_done();
> >+	bfin_write_EMAC_STAADD(SET_PHYAD(PHYAddr) | SET_REGAD(RegAddr) | STABUSY);	/* read mode */
> >+	poll_mdc_done();
> >+
> >+	return (u16) bfin_read_EMAC_STADAT();
> >+}
> >+
> >+/* Write an off-chip register in a PHY through the MDC/MDIO port */
> >+static void raw_write_phy_reg(u16 PHYAddr, u16 RegAddr, u32 Data)
> >+{
> >+	bfin_write_EMAC_STADAT(Data);
> >+
> >+	bfin_write_EMAC_STAADD(SET_PHYAD(PHYAddr) | SET_REGAD(RegAddr) | STAOP | STABUSY);	/* write mode */
> >+
> >+	poll_mdc_done();
> >+}
> >+
> >+static void write_phy_reg(u16 PHYAddr, u16 RegAddr, u32 Data)
> >+{
> >+	poll_mdc_done();
> >+	raw_write_phy_reg(PHYAddr, RegAddr, Data);
> >+}
> >+
> >+/* set up the phy */
> >+static void bf537mac_setphy(struct net_device *dev)
> >+{
> >+	u16 phydat;
> >+	u32 sysctl;
> >+	struct bf537mac_local *lp = netdev_priv(dev);
> >+
> >+	pr_debug("start settting up phy\n");
> >+
> >+	/* Program PHY registers */
> >+	phydat = 0;
> >+
> >+	/* issue a reset */
> >+	raw_write_phy_reg(lp->PhyAddr, PHYREG_MODECTL, 0x8000);
> >+
> >+	/* wait half a second */
> >+	udelay(500);
> >+
> >+	phydat = read_phy_reg(lp->PhyAddr, PHYREG_MODECTL);
> >+
> >+	/* advertise flow control supported */
> >+	phydat = read_phy_reg(lp->PhyAddr, PHYREG_ANAR);
> >+	phydat |= (1 << 10);
> >+	write_phy_reg(lp->PhyAddr, PHYREG_ANAR, phydat);
> >+
> >+	phydat = 0;
> >+	if (lp->Negotiate) {
> >+		phydat |= 0x1000;	/* enable auto negotiation */
> >+	} else {
> >+		if (lp->FullDuplex) {
> >+			phydat |= (1 << 8);	/* full duplex */
> >+		} else {
> >+			phydat &= (~(1 << 8));	/* half duplex */
> >+		}
> >+		if (!lp->Port10) {
> >+			phydat |= (1 << 13);	/* 100 Mbps */
> >+		} else {
> >+			phydat &= (~(1 << 13));	/* 10 Mbps */
> >+		}
> >+	}
> >+
> >+	if (lp->Loopback) {
> >+		phydat |= (1 << 14);	/* enable TX->RX loopback */
> >+#if 0
> >+		write_phy_reg(lp->PhyAddr, PHYREG_MODECTL, phydat);
> >+#endif
> >+	}
> >+
> >+	write_phy_reg(lp->PhyAddr, PHYREG_MODECTL, phydat);
> >+	udelay(500);
> >+
> >+	phydat = read_phy_reg(lp->PhyAddr, PHYREG_MODECTL);
> >+	/* check for SMSC PHY */
> >+	if ((read_phy_reg(lp->PhyAddr, PHYREG_PHYID1) == 0x7)
> >+	    && ((read_phy_reg(lp->PhyAddr, PHYREG_PHYID2) & 0xfff0) == 0xC0A0)) {
> >+		/* we have SMSC PHY so reqest interrupt on link down condition */
> >+		write_phy_reg(lp->PhyAddr, 30, 0x0ff);	/* enable interrupts */
> >+		/* enable PHY_INT */
> >+		sysctl = bfin_read_EMAC_SYSCTL();
> >+		sysctl |= 0x1;
> >+#if 0
> >+		bfin_write_EMAC_SYSCTL(sysctl);
> >+#endif
> >+	}
> >+}
> >+
> >+/**************************************************************************/
> >+void setup_system_regs(struct net_device *dev)
> >+{
> >+	int PHYADDR;
> >+	unsigned short sysctl, phydat;
> >+	u32 opmode;
> >+	struct bf537mac_local *lp = netdev_priv(dev);
> >+	int count = 0;
> >+
> >+	PHYADDR = lp->PhyAddr;
> >+
> >+	/* Enable PHY output */
> >+	if (!(bfin_read_VR_CTL() & PHYCLKOE))
> >+		bfin_write_VR_CTL(bfin_read_VR_CTL() | PHYCLKOE);
> >+
> >+	/* MDC  = 2.5 MHz */
> >+	sysctl = SET_MDCDIV(24);
> >+	/* Odd word alignment for Receive Frame DMA word */
> >+	/* Configure checksum support and rcve frame word alignment */
> >+#if defined(BFIN_MAC_CSUM_OFFLOAD)
> >+	sysctl |= RXDWA | RXCKS;
> >+#else
> >+	sysctl |= RXDWA;
> >+#endif
> >+	bfin_write_EMAC_SYSCTL(sysctl);
> >+	/* auto negotiation on  */
> >+	/* full duplex          */
> >+	/* 100 Mbps             */
> >+	phydat = PHY_ANEG_EN | PHY_DUPLEX | PHY_SPD_SET;
> >+	write_phy_reg(PHYADDR, PHYREG_MODECTL, phydat);
> >+
> >+	/* test if full duplex supported */
> >+	do {
> >+		msleep(100);
> >+		phydat = read_phy_reg(PHYADDR, PHYREG_MODESTAT);
> >+		if (count > 30) {
> >+			printk(KERN_NOTICE CARDNAME
> >+			       ": Link is down, please check your network connection\n");
> >+			break;
> >+		}
> >+		count++;
> >+	} while (!(phydat & 0x0004));
> >+
> >+	phydat = read_phy_reg(PHYADDR, PHYREG_ANLPAR);
> >+
> >+	if ((phydat & 0x0100) || (phydat & 0x0040)) {
> >+		opmode = FDMODE;
> >+	} else {
> >+		opmode = 0;
> >+		printk(KERN_INFO CARDNAME ": Network is set to half duplex\n");
> >+	}
> >+
> >+#if defined(CONFIG_BFIN_MAC_RMII)
> >+	opmode |= RMII; /* For Now only 100MBit are supported */
> >+#endif
> >+
> >+	bfin_write_EMAC_OPMODE(opmode);
> >+
> >+#if 0
> >+	bfin_write_EMAC_MMC_CTL(RSTC | CROLL | MMCE);
> >+#endif
> >+	bfin_write_EMAC_MMC_CTL(RSTC | CROLL);
> >+
> >+	/* Initialize the TX DMA channel registers */
> >+	bfin_write_DMA2_X_COUNT(0);
> >+	bfin_write_DMA2_X_MODIFY(4);
> >+	bfin_write_DMA2_Y_COUNT(0);
> >+	bfin_write_DMA2_Y_MODIFY(0);
> >+
> >+	/* Initialize the RX DMA channel registers */
> >+	bfin_write_DMA1_X_COUNT(0);
> >+	bfin_write_DMA1_X_MODIFY(4);
> >+	bfin_write_DMA1_Y_COUNT(0);
> >+	bfin_write_DMA1_Y_MODIFY(0);
> >+}
> >+
> >+void setup_mac_addr(u8 * mac_addr)
> >+{
> >+	/* this depends on a little-endian machine */
> >+	bfin_write_EMAC_ADDRLO(*(u32 *) & mac_addr[0]);
> >+	bfin_write_EMAC_ADDRHI(*(u16 *) & mac_addr[4]);
> >+}
> >+
> >+static void adjust_tx_list(void)
> >+{
> >+	if (tx_list_head->status.status_word != 0
> >+	    && current_tx_ptr != tx_list_head) {
> >+		goto adjust_head;	/* released something, just return; */
> >+	}
> >+
> >+	/* if nothing released, check wait condition */
> >+	/* current's next can not be the head, otherwise the dma will not stop as we want */
> >+	if (current_tx_ptr->next->next == tx_list_head) {
> >+		while (tx_list_head->status.status_word == 0) {
> >+			udelay(10);
> >+			if (tx_list_head->status.status_word != 0
> >+			    || !(bfin_read_DMA2_IRQ_STATUS() & 0x08)) {
> >+				goto adjust_head;
> >+			}
> >+		}
> >+		if (tx_list_head->status.status_word != 0) {
> >+			goto adjust_head;
> >+		}
> >+	}
> >+
> >+	return;
> >+
> >+      adjust_head:
> >+	do {
> >+		tx_list_head->desc_a.config.b_DMA_EN = 0;
> >+		tx_list_head->status.status_word = 0;
> >+		if (tx_list_head->skb) {
> >+			dev_kfree_skb(tx_list_head->skb);
> >+			tx_list_head->skb = NULL;
> >+		} else {
> >+			printk(KERN_ERR CARDNAME
> >+			       ": no sk_buff in a transmitted frame!\n");
> >+		}
> >+		tx_list_head = tx_list_head->next;
> >+	} while (tx_list_head->status.status_word != 0
> >+		 && current_tx_ptr != tx_list_head);
> >+	return;
> >+
> >+}
> >+
> >+static int bf537mac_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
> >+{
> >+	struct bf537mac_local *lp = netdev_priv(dev);
> >+	unsigned int data;
> >+
> >+	current_tx_ptr->skb = skb;
> >+	/* Is skb->data always 16-bit aligned? Do we need to memcpy((char *)(tail->packet + 2),skb->data,len)? */
> >+	if ((((unsigned int)(skb->data)) & 0x02) == 2) {
> >+		/* move skb->data to current_tx_ptr payload */
> >+		data = (unsigned int)(skb->data) - 2;
> >+		*((unsigned short *)data) = (unsigned short)(skb->len);
> >+		current_tx_ptr->desc_a.start_addr = (unsigned long)data;
> >+		blackfin_dcache_flush_range(data, (data + (skb->len)) + 2);	/* this is important! */
> >+
> >+	} else {
> >+		*((unsigned short *)(current_tx_ptr->packet)) =
> >+		    (unsigned short)(skb->len);
> >+		memcpy((char *)(current_tx_ptr->packet + 2), skb->data,
> >+		       (skb->len));
> >+		current_tx_ptr->desc_a.start_addr =
> >+		    (unsigned long)current_tx_ptr->packet;
> >+		if (current_tx_ptr->status.status_word != 0)
> >+			current_tx_ptr->status.status_word = 0;
> >+		blackfin_dcache_flush_range((unsigned int)current_tx_ptr->
> >+					    packet,
> >+					    (unsigned int)(current_tx_ptr->
> >+							   packet + skb->len) +
> >+					    2);
> >+	}
> >+
> >+	current_tx_ptr->desc_a.config.b_DMA_EN = 1;	/* enable this packet's dma */
> >+
> >+	if (bfin_read_DMA2_IRQ_STATUS() & 0x08) {	/* tx dma is running, just return */
> >+		goto out;
> >+	} else {
> >+		/* tx dma is not running */
> >+		bfin_write_DMA2_NEXT_DESC_PTR(&(current_tx_ptr->desc_a));
> >+		/* dma enabled, read from memory, size is 6 */
> >+		bfin_write_DMA2_CONFIG(*((unsigned short *)(&(current_tx_ptr->desc_a.config))));
> >+		/* Turn on the EMAC tx */
> >+		bfin_write_EMAC_OPMODE(bfin_read_EMAC_OPMODE() | TE);
> >+	}
> >+
> >+      out:
> >+	adjust_tx_list();
> >+	current_tx_ptr = current_tx_ptr->next;
> >+	dev->trans_start = jiffies;
> >+	lp->stats.tx_packets++;
> >+	lp->stats.tx_bytes += (skb->len);
> >+	return 0;
> >+}
> >+
> >+static void bf537mac_rx(struct net_device *dev)
> >+{
> >+	struct sk_buff *skb, *new_skb;
> >+	struct bf537mac_local *lp = netdev_priv(dev);
> >+	unsigned short len;
> >+
> >+	/* allocat a new skb for next time receive */
> >+	skb = current_rx_ptr->skb;
> >+	new_skb = dev_alloc_skb(PKT_BUF_SZ + 2);
> >+	if (!new_skb) {
> >+		printk(KERN_NOTICE CARDNAME
> >+		       ": rx: low on mem - packet dropped\n");
> >+		lp->stats.rx_dropped++;
> >+		goto out;
> >+	}
> >+	/* reserve 2 bytes for RXDWA padding */
> >+	skb_reserve(new_skb, 2);
> >+	current_rx_ptr->skb = new_skb;
> >+	current_rx_ptr->desc_a.start_addr = (unsigned long)new_skb->data - 2;
> >+
> >+#if 0
> >+	int i;
> >+	if (len >= 64) {
> >+		for (i=0;i<len;i++) {
> >+			printk("%.2x-",((unsigned char *)pkt)[i]);
> >+			if (((i%8)==0) && (i!=0)) printk("\n");
> >+		}
> >+	printk("\n");
> >+	}
> >+#endif
> >+
> >+	len = (unsigned short)((current_rx_ptr->status.status_word) & RX_FRLEN);
> >+	skb_put(skb, len);
> >+	blackfin_dcache_invalidate_range((unsigned long)skb->head,
> >+					 (unsigned long)skb->tail);
> >+
> >+	dev->last_rx = jiffies;
> >+	skb->dev = dev;
> >+	skb->protocol = eth_type_trans(skb, dev);
> >+#if defined(BFIN_MAC_CSUM_OFFLOAD)
> >+	skb->csum = current_rx_ptr->status.ip_payload_csum;
> >+	skb->ip_summed = CHECKSUM_PARTIAL;
> >+#endif
> >+
> >+	netif_rx(skb);
> >+	lp->stats.rx_packets++;
> >+	lp->stats.rx_bytes += len;
> >+	current_rx_ptr->status.status_word = 0x00000000;
> >+	current_rx_ptr = current_rx_ptr->next;
> >+
> >+      out:
> >+	return;
> >+}
> >+
> >+/* interrupt routine to handle rx and error signal */
> >+static irqreturn_t bf537mac_interrupt(int irq, void *dev_id)
> >+{
> >+	struct net_device *dev = dev_id;
> >+	int number = 0;
> >+
> >+      get_one_packet:
> >+	if (current_rx_ptr->status.status_word == 0) {	/* no more new packet received */
> >+		if (number == 0) {
> >+			if (current_rx_ptr->next->status.status_word != 0) {
> >+				current_rx_ptr = current_rx_ptr->next;
> >+				goto real_rx;
> >+			}
> >+		}
> >+		bfin_write_DMA1_IRQ_STATUS(bfin_read_DMA1_IRQ_STATUS() |
> >+					   DMA_DONE | DMA_ERR);
> >+		return IRQ_HANDLED;
> >+	}
> >+
> >+      real_rx:
> >+	bf537mac_rx(dev);
> >+	number++;
> >+	goto get_one_packet;
> >+}
> >+
> >+#ifdef CONFIG_NET_POLL_CONTROLLER
> >+static void bf537mac_poll(struct net_device *dev)
> >+{
> >+	disable_irq(IRQ_MAC_RX);
> >+	bf537mac_interrupt(IRQ_MAC_RX, dev);
> >+	enable_irq(IRQ_MAC_RX);
> >+}
> >+#endif				/* CONFIG_NET_POLL_CONTROLLER */
> >+
> >+static void bf537mac_reset(void)
> >+{
> >+	unsigned int opmode;
> >+
> >+	opmode = bfin_read_EMAC_OPMODE();
> >+	opmode &= (~RE);
> >+	opmode &= (~TE);
> >+	/* Turn off the EMAC */
> >+	bfin_write_EMAC_OPMODE(bfin_read_EMAC_OPMODE() & opmode);
> >+}
> >+
> >+/*
> >+ * Enable Interrupts, Receive, and Transmit
> >+ */
> >+static int bf537mac_enable(struct net_device *dev)
> >+{
> >+	u32 opmode;
> >+
> >+	pr_debug("%s: %s\n", dev->name, __FUNCTION__);
> >+
> >+	/* Set RX DMA */
> >+	bfin_write_DMA1_NEXT_DESC_PTR(&(rx_list_head->desc_a));
> >+	bfin_write_DMA1_CONFIG(*
> >+			       ((unsigned short
> >+				 *)(&(rx_list_head->desc_a.config))));
> >+
> >+	/* Wait MII done */
> >+	poll_mdc_done();
> >+
> >+	/* We enable only RX here */
> >+	/* ASTP   : Enable Automatic Pad Stripping
> >+	   PR     : Promiscuous Mode for test
> >+	   PSF    : Receive frames with total length less than 64 bytes.
> >+	   FDMODE : Full Duplex Mode
> >+	   LB     : Internal Loopback for test
> >+	   RE     : Receiver Enable */
> >+	opmode = bfin_read_EMAC_OPMODE();
> >+	if (opmode & FDMODE)
> >+		opmode |= PSF;
> >+	else
> >+		opmode |= DRO | DC | PSF;
> >+	opmode |= RE;
> >+
> >+#if defined(CONFIG_BFIN_MAC_RMII)
> >+	opmode |= RMII; /* For Now only 100MBit are supported */
> >+#ifdef CONFIG_BF_REV_0_2
> >+	opmode |= TE;
> >+#endif
> >+#endif
> >+	/* Turn on the EMAC rx */
> >+	bfin_write_EMAC_OPMODE(opmode);
> >+
> >+	return 0;
> >+}
> >+
> >+/* Our watchdog timed out. Called by the networking layer */
> >+static void bf537mac_timeout(struct net_device *dev)
> >+{
> >+	pr_debug("%s: %s\n", dev->name, __FUNCTION__);
> >+
> >+	bf537mac_reset();
> >+
> >+	/* reset tx queue */
> >+	tx_list_tail = tx_list_head->next;
> >+
> >+	bf537mac_enable(dev);
> >+
> >+	/* We can accept TX packets again */
> >+	dev->trans_start = jiffies;
> >+	netif_wake_queue(dev);
> >+}
> >+
> >+/*
> >+ * Get the current statistics.
> >+ * This may be called with the card open or closed.
> >+ */
> >+static struct net_device_stats *bf537mac_query_statistics(struct net_device
> >+							  *dev)
> >+{
> >+	struct bf537mac_local *lp = netdev_priv(dev);
> >+
> >+	pr_debug("%s: %s\n", dev->name, __FUNCTION__);
> >+
> >+	return &lp->stats;
> >+}
> >+
> >+/*
> >+ * This routine will, depending on the values passed to it,
> >+ * either make it accept multicast packets, go into
> >+ * promiscuous mode (for TCPDUMP and cousins) or accept
> >+ * a select set of multicast packets
> >+ */
> >+static void bf537mac_set_multicast_list(struct net_device *dev)
> >+{
> >+	u32 sysctl;
> >+
> >+	if (dev->flags & IFF_PROMISC) {
> >+		printk(KERN_INFO "%s: set to promisc mode\n", dev->name);
> >+		sysctl = bfin_read_EMAC_OPMODE();
> >+		sysctl |= RAF;
> >+		bfin_write_EMAC_OPMODE(sysctl);
> >+	} else if (dev->flags & IFF_ALLMULTI || dev->mc_count > 16) {
> >+		/* accept all multicast */
> >+		sysctl = bfin_read_EMAC_OPMODE();
> >+		sysctl |= PAM;
> >+		bfin_write_EMAC_OPMODE(sysctl);
> >+	} else if (dev->mc_count) {
> >+		/* set multicast */
> >+	} else {
> >+		/* clear promisc or multicast mode */
> >+		sysctl = bfin_read_EMAC_OPMODE();
> >+		sysctl &= ~(RAF | PAM);
> >+		bfin_write_EMAC_OPMODE(sysctl);
> >+	}
> >+}
> >+
> >+/*
> >+ * this puts the device in an inactive state
> >+ */
> >+static void bf537mac_shutdown(struct net_device *dev)
> >+{
> >+	/* Turn off the EMAC */
> >+	bfin_write_EMAC_OPMODE(0x00000000);
> >+	/* Turn off the EMAC RX DMA */
> >+	bfin_write_DMA1_CONFIG(0x0000);
> >+	bfin_write_DMA2_CONFIG(0x0000);
> >+}
> >+
> >+/*
> >+ * Open and Initialize the interface
> >+ *
> >+ * Set up everything, reset the card, etc..
> >+ */
> >+static int bf537mac_open(struct net_device *dev)
> >+{
> >+	pr_debug("%s: %s\n", dev->name, __FUNCTION__);
> >+
> >+	/*
> >+	 * Check that the address is valid.  If its not, refuse
> >+	 * to bring the device up.  The user must specify an
> >+	 * address using ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx
> >+	 */
> >+	if (!is_valid_ether_addr(dev->dev_addr)) {
> >+		printk(KERN_WARNING CARDNAME ": no valid ethernet hw addr\n");
> >+		return -EINVAL;
> >+	}
> >+
> >+	/* initial rx and tx list */
> >+	desc_list_init();
> >+
> >+	bf537mac_setphy(dev);
> >+	setup_system_regs(dev);
> >+	bf537mac_reset();
> >+	bf537mac_enable(dev);
> >+
> >+	pr_debug("hardware init finished\n");
> >+	netif_start_queue(dev);
> >+	netif_carrier_on(dev);
> >+
> >+	return 0;
> >+}
> >+
> >+/*
> >+ *
> >+ * this makes the board clean up everything that it can
> >+ * and not talk to the outside world.   Caused by
> >+ * an 'ifconfig ethX down'
> >+ */
> >+static int bf537mac_close(struct net_device *dev)
> >+{
> >+	pr_debug("%s: %s\n", dev->name, __FUNCTION__);
> >+
> >+	netif_stop_queue(dev);
> >+	netif_carrier_off(dev);
> >+
> >+	/* clear everything */
> >+	bf537mac_shutdown(dev);
> >+
> >+	/* free the rx/tx buffers */
> >+	desc_list_free();
> >+
> >+	return 0;
> >+}
> >+
> >+static int __init bf537mac_probe(struct net_device *dev)
> >+{
> >+	struct bf537mac_local *lp = netdev_priv(dev);
> >+	int retval;
> >+
> >+	/* Grab the MAC address in the MAC */
> >+	*(u32 *) (&(dev->dev_addr[0])) = bfin_read_EMAC_ADDRLO();
> >+	*(u16 *) (&(dev->dev_addr[4])) = (u16) bfin_read_EMAC_ADDRHI();
> >+
> >+/* probe mac */
> >+	/*todo: how to proble? which is revision_register */
> >+	bfin_write_EMAC_ADDRLO(0x12345678);
> >+	if (bfin_read_EMAC_ADDRLO() != 0x12345678) {
> >+		pr_debug("can't detect bf537 mac!\n");
> >+		retval = -ENODEV;
> >+		goto err_out;
> >+	}
> >+
> >+	/*Is it valid? (Did bootloader initialize it?) */
> >+	if (!is_valid_ether_addr(dev->dev_addr)) {
> >+		/* Grab the MAC from the board somehow - this is done in the
> >+		   arch/blackfin/boards/bf537/boardname.c */
> >+		get_bf537_ether_addr(dev->dev_addr);
> >+	}
> >+
> >+	/* If still not valid, get a random one */
> >+	if (!is_valid_ether_addr(dev->dev_addr)) {
> >+		random_ether_addr(dev->dev_addr);
> >+	}
> >+
> >+	setup_mac_addr(dev->dev_addr);
> >+
> >+	/* Fill in the fields of the device structure with ethernet values. */
> >+	ether_setup(dev);
> >+
> >+	dev->open = bf537mac_open;
> >+	dev->stop = bf537mac_close;
> >+	dev->hard_start_xmit = bf537mac_hard_start_xmit;
> >+	dev->tx_timeout = bf537mac_timeout;
> >+	dev->get_stats = bf537mac_query_statistics;
> >+	dev->set_multicast_list = bf537mac_set_multicast_list;
> >+#if 0
> >+	dev->ethtool_ops = &bf537mac_ethtool_ops;
> >+#endif
> >+#ifdef CONFIG_NET_POLL_CONTROLLER
> >+	dev->poll_controller = bf537mac_poll;
> >+#endif
> >+
> >+	/* fill in some of the fields */
> >+	lp->version = 1;
> >+	lp->PhyAddr = 0x01;
> >+	lp->CLKIN = 25;
> >+	lp->FullDuplex = 0;
> >+	lp->Negotiate = 1;
> >+	lp->FlowControl = 0;
> >+	spin_lock_init(&lp->lock);
> >+
> >+	/* set the GPIO pins to Ethernet mode */
> >+	setup_pin_mux();
> >+
> >+	/* now, enable interrupts */
> >+	/* register irq handler */
> >+	if (request_irq
> >+	    (IRQ_MAC_RX, bf537mac_interrupt, IRQF_DISABLED | IRQF_SHARED,
> >+	     "BFIN537_MAC_RX", dev)) {
> >+		printk(KERN_WARNING CARDNAME
> >+		       ": Unable to attach BlackFin MAC RX interrupt\n");
> >+		return -EBUSY;
> >+	}
> >+
> >+	/* Enable PHY output early */
> >+	if (!(bfin_read_VR_CTL() & PHYCLKOE))
> >+		bfin_write_VR_CTL(bfin_read_VR_CTL() | PHYCLKOE);
> >+
> >+	retval = register_netdev(dev);
> >+	if (retval == 0) {
> >+		/* now, print out the card info, in a short format.. */
> >+		printk(KERN_INFO "Blackfin mac net device registered\n");
> >+	}
> >+
> >+      err_out:
> >+	return retval;
> >+}
> >+
> >+static int bfin_mac_probe(struct platform_device *pdev)
> >+{
> >+	struct net_device *ndev;
> >+
> >+	ndev = alloc_etherdev(sizeof(struct bf537mac_local));
> >+
> >+	if (!ndev) {
> >+		printk(KERN_WARNING CARDNAME ": could not allocate device\n");
> >+		return -ENOMEM;
> >+	}
> >+
> >+	if (bf537mac_probe(ndev) != 0) {
> >+		platform_set_drvdata(pdev, NULL);
> >+		free_netdev(ndev);
> >+		printk(KERN_WARNING CARDNAME ": not found\n");
> >+		return -ENODEV;
> >+	}
> >+
> >+	SET_MODULE_OWNER(ndev);
> >+	SET_NETDEV_DEV(ndev, &pdev->dev);
> >+
> >+	platform_set_drvdata(pdev, ndev);
> >+
> >+	return 0;
> >+}
> >+
> >+static int bfin_mac_remove(struct platform_device *pdev)
> >+{
> >+	struct net_device *ndev = platform_get_drvdata(pdev);
> >+
> >+	platform_set_drvdata(pdev, NULL);
> >+
> >+	unregister_netdev(ndev);
> >+
> >+	free_irq(IRQ_MAC_RX, ndev);
> >+
> >+	free_netdev(ndev);
> >+
> >+	return 0;
> >+}
> >+
> >+static int bfin_mac_suspend(struct platform_device *pdev, pm_message_t state)
> >+{
> >+	return 0;
> >+}
> >+
> >+static int bfin_mac_resume(struct platform_device *pdev)
> >+{
> >+	return 0;
> >+}
> >+
> >+static struct platform_driver bfin_mac_driver = {
> >+	.probe = bfin_mac_probe,
> >+	.remove = bfin_mac_remove,
> >+	.resume = bfin_mac_resume,
> >+	.suspend = bfin_mac_suspend,
> >+	.driver = {
> >+		   .name = CARDNAME,
> >+		   },
> >+};
> >+
> >+static int __init bfin_mac_init(void)
> >+{
> >+	return platform_driver_register(&bfin_mac_driver);
> >+}
> >+
> >+module_init(bfin_mac_init);
> >+
> >+static void __exit bfin_mac_cleanup(void)
> >+{
> >+	platform_driver_unregister(&bfin_mac_driver);
> >+}
> >+
> >+module_exit(bfin_mac_cleanup);
> >diff -puN /dev/null drivers/net/bfin_mac.h
> >--- /dev/null
> >+++ a/drivers/net/bfin_mac.h
> >@@ -0,0 +1,147 @@
> >+/*
> >+ * File:         drivers/net/bfin_mac.h
> >+ * Based on:
> >+ * Author:       Luke Yang <[email-masked]>
> >+ *
> >+ * Created:
> >+ * Description:
> >+ *
> >+ * Modified:
> >+ *               Copyright 2004-2006 Analog Devices Inc.
> >+ *
> >+ * Bugs:         Enter bugs at http://blackfin.uclinux.org/
> >+ *
> >+ * 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, 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 ;  see the file COPYING.
> >+ * If not, write to the Free Software Foundation,
> >+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
> >+ */
> >+
> >+/*
> >+ * PHY REGISTER NAMES
> >+ */
> >+#define PHYREG_MODECTL		0x0000
> >+#define PHYREG_MODESTAT		0x0001
> >+#define PHYREG_PHYID1		0x0002
> >+#define PHYREG_PHYID2		0x0003
> >+#define PHYREG_ANAR		0x0004
> >+#define PHYREG_ANLPAR		0x0005
> >+#define PHYREG_ANER		0x0006
> >+#define PHYREG_NSR		0x0010
> >+#define PHYREG_LBREMR		0x0011
> >+#define PHYREG_REC		0x0012
> >+#define PHYREG_10CFG		0x0013
> >+#define PHYREG_PHY1_1		0x0014
> >+#define PHYREG_PHY1_2		0x0015
> >+#define PHYREG_PHY2		0x0016
> >+#define PHYREG_TW_1		0x0017
> >+#define PHYREG_TW_2		0x0018
> >+#define PHYREG_TEST		0x0019
> >+
> >+#define PHY_RESET		0x8000
> >+#define PHY_ANEG_EN		0x1000
> >+#define PHY_DUPLEX		0x0100
> >+#define PHY_SPD_SET		0x2000
> >+
> >+#define BFIN_MAC_CSUM_OFFLOAD
> >+
> >+typedef struct _DMA_CONFIG {
> >+	unsigned short b_DMA_EN:1;	/* Bit 0 : DMA Enable */
> >+	unsigned short b_WNR:1;		/* Bit 1 : DMA Direction */
> >+	unsigned short b_WDSIZE:2;	/* Bit 2 & 3 : DMA Tranfer Word size */
> >+	unsigned short b_DMA2D:1;	/* Bit 4 : DMA Mode 2D or 1D */
> >+	unsigned short b_RESTART:1;	/* Bit 5 : Retain the FIFO */
> >+	unsigned short b_DI_SEL:1;	/* Bit 6 : Data Interrupt Timing Select */
> >+	unsigned short b_DI_EN:1;	/* Bit 7 : Data Interrupt Enable */
> >+	unsigned short b_NDSIZE:4;	/* Bit 8 to 11 : Flex descriptor Size */
> >+	unsigned short b_FLOW:3;	/* Bit 12 to 14 : FLOW */
> >+} DMA_CONFIG_REG;
> >+
> >+struct dma_descriptor {
> >+	struct dma_descriptor *next_dma_desc;
> >+	unsigned long start_addr;
> >+	DMA_CONFIG_REG config;
> >+	unsigned short x_count;
> >+};
> >+
> >+#if 0
> >+struct status_area {
> >+  unsigned short ip_hdr_chksum;         /* the IP header checksum */
> >+  unsigned short ip_payload_chksum;     /* the IP header and payload checksum */
> >+  unsigned long  status_word;           /* the frame status word */
> >+};
> >+#endif
> >+
> >+struct status_area_rx {
> >+#if defined(BFIN_MAC_CSUM_OFFLOAD)
> >+	unsigned short ip_hdr_csum;	/* ip header checksum */
> >+	unsigned short ip_payload_csum;	/* ip payload(udp or tcp or others) checksum */
> >+#endif
> >+	unsigned long status_word;	/* the frame status word */
> >+};
> >+
> >+struct status_area_tx {
> >+	unsigned long status_word;	/* the frame status word */
> >+};
> >+
> >+/* use two descriptors for a packet */
> >+struct net_dma_desc_rx {
> >+	struct net_dma_desc_rx *next;
> >+	struct sk_buff *skb;
> >+	struct dma_descriptor desc_a;
> >+	struct dma_descriptor desc_b;
> >+	volatile struct status_area_rx status;
> >+};
> >+
> >+/* use two descriptors for a packet */
> >+struct net_dma_desc_tx {
> >+	struct net_dma_desc_tx *next;
> >+	struct sk_buff *skb;
> >+	struct dma_descriptor desc_a;
> >+	struct dma_descriptor desc_b;
> >+	volatile unsigned char packet[1560];
> >+	volatile struct status_area_tx status;
> >+};
> >+
> >+struct bf537mac_local {
> >+	/*
> >+	 * these are things that the kernel wants me to keep, so users
> >+	 * can find out semi-useless statistics of how well the card is
> >+	 * performing
> >+	 */
> >+	struct net_device_stats stats;
> >+
> >+	int version;
> >+
> >+	int FlowEnabled;	/* record if data flow is active */
> >+	int EtherIntIVG;	/* IVG for the ethernet interrupt */
> >+	int RXIVG;		/* IVG for the RX completion */
> >+	int TXIVG;		/* IVG for the TX completion */
> >+	int PhyAddr;		/* PHY address */
> >+	int OpMode;		/* set these bits n the OPMODE regs */
> >+	int Port10;		/* set port speed to 10 Mbit/s */
> >+	int GenChksums;		/* IP checksums to be calculated */
> >+	int NoRcveLnth;		/* dont insert recv length at start of buffer */
> >+	int StripPads;		/* remove trailing pad bytes */
> >+	int FullDuplex;		/* set full duplex mode */
> >+	int Negotiate;		/* enable auto negotiation */
> >+	int Loopback;		/* loopback at the PHY */
> >+	int Cache;		/* Buffers may be cached */
> >+	int FlowControl;	/* flow control active */
> >+	int CLKIN;		/* clock in value in MHZ */
> >+	unsigned short IntMask;	/* interrupt mask */
> >+	unsigned char Mac[6];	/* MAC address of the board */
> >+	spinlock_t lock;
> >+};
> >+
> >+extern void get_bf537_ether_addr(char *addr);
> >_
> >-
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> >