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

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

[akpm]

From: "Wu, Bryan" <bryan.wu@analog.com>

This patch implements the driver necessary use the Analog Devices
Blackfin processor's on-chip ethernet MAC controller.

Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Cc: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 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 <luke.yang@analog.com>
+ *
+ * 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>
+
+#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 <luke.yang@analog.com>
+ *
+ * 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);
_

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

[Sinan Akman]

akpm@linux-foundation.org wrote:

>From: "Wu, Bryan" <bryan.wu@analog.com>
>
>This patch implements the driver necessary use the Analog Devices
>Blackfin processor's on-chip ethernet MAC controller.
>
>Signed-off-by: Bryan Wu <bryan.wu@analog.com>
>Cc: Jeff Garzik <jeff@garzik.org>
>Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
>---
>
> 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 <luke.yang@analog.com>
>+ *
>+ * 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 ?

>+
>+#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 <luke.yang@analog.com>
>+ *
>+ * 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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>

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

[Bryan Wu]

On Mon, 2007-07-09 at 15:14 -0400, Sinan Akman wrote:
> akpm@linux-foundation.org wrote:
> 
> >From: "Wu, Bryan" <bryan.wu@analog.com>
> >
> >This patch implements the driver necessary use the Analog Devices
> >Blackfin processor's on-chip ethernet MAC controller.
> >
> >Signed-off-by: Bryan Wu <bryan.wu@analog.com>
> >Cc: Jeff Garzik <jeff@garzik.org>
> >Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
> >---
> >
> > 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 <luke.yang@analog.com>
> >+ *
> >+ * 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 <luke.yang@analog.com>
> >+ *
> >+ * 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);
> >_
> >-
> >To unsubscribe from this list: send the line "unsubscribe netdev" in
> >the body of a message to majordomo@vger.kernel.org
> >More majordomo info at  http://vger.kernel.org/majordomo-info.html
> >
> >  
> >

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

[Sinan Akman]

Bryan Wu wrote:

>On Mon, 2007-07-09 at 15:14 -0400, Sinan Akman wrote:
>  
>
>>akpm@linux-foundation.org wrote:
>>
>>    
>>
>>>From: "Wu, Bryan" <bryan.wu@analog.com>
>>>
>>>This patch implements the driver necessary use the Analog Devices
>>>Blackfin processor's on-chip ethernet MAC controller.
>>>
>>>Signed-off-by: Bryan Wu <bryan.wu@analog.com>
>>>Cc: Jeff Garzik <jeff@garzik.org>
>>>Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
>>>---
>>>
>>>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 <luke.yang@analog.com>
>>>+ *
>>>+ * 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);
>>>      
>>>
       Bryan, I might be completly off here but
is this skb allocation different than the one
below in  bf537mac_rx ?

>>>+		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);
>>>      
>>>
           The one right above here ?

>>>+	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 <luke.yang@analog.com>
>>>+ *
>>>+ * 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);
>>>_
>>>-
>>>To unsubscribe from this list: send the line "unsubscribe netdev" in
>>>the body of a message to majordomo@vger.kernel.org
>>>More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>>
>>> 
>>>
>>>      
>>>
>
>  
>

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

[Jeff Garzik]

akpm@linux-foundation.org wrote:
> From: "Wu, Bryan" <bryan.wu@analog.com>
> 
> This patch implements the driver necessary use the Analog Devices
> Blackfin processor's on-chip ethernet MAC controller.
> 
> Signed-off-by: Bryan Wu <bryan.wu@analog.com>
> Cc: Jeff Garzik <jeff@garzik.org>
> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
> ---
> 
>  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(+)

If I'm not mistaken, Bryan just said he was resending an updated version?