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authorBen Dooks <ben-linux@fluff.org>2006-09-15 18:45:17 -0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-09-25 05:25:18 -0400
commit98c418a002ce5f3110eeb31d1ce8261f5199997d (patch)
tree5fc4c72fe6a01afa33fe4a88a53bd980320ab299
parentc374fe7148f1b13854186a7a14c4a2c4ffe3134b (diff)
[ARM] 3798/1: S3C2440: DMA channel mappings
S3C2440 DMA channel mappings Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat
-rw-r--r--arch/arm/mach-s3c2410/Makefile1
-rw-r--r--arch/arm/mach-s3c2410/s3c2440-dma.c164
2 files changed, 165 insertions, 0 deletions
diff --git a/arch/arm/mach-s3c2410/Makefile b/arch/arm/mach-s3c2410/Makefile
index efedeb82c8c4..129e037c037d 100644
--- a/arch/arm/mach-s3c2410/Makefile
+++ b/arch/arm/mach-s3c2410/Makefile
@@ -50,6 +50,7 @@ obj-$(CONFIG_CPU_S3C2440) += s3c2440.o s3c2440-dsc.o
50obj-$(CONFIG_CPU_S3C2440) += s3c2440-irq.o 50obj-$(CONFIG_CPU_S3C2440) += s3c2440-irq.o
51obj-$(CONFIG_CPU_S3C2440) += s3c2440-clock.o 51obj-$(CONFIG_CPU_S3C2440) += s3c2440-clock.o
52obj-$(CONFIG_CPU_S3C2440) += s3c2410-gpio.o 52obj-$(CONFIG_CPU_S3C2440) += s3c2410-gpio.o
53obj-dma-$(CONFIG_CPU_S3C2440) += s3c2440-dma.o
53 54
54# S3C2442 support 55# S3C2442 support
55 56
diff --git a/arch/arm/mach-s3c2410/s3c2440-dma.c b/arch/arm/mach-s3c2410/s3c2440-dma.c
new file mode 100644
index 000000000000..11e109c84a15
--- /dev/null
+++ b/arch/arm/mach-s3c2410/s3c2440-dma.c
@@ -0,0 +1,164 @@
1/* linux/arch/arm/mach-s3c2410/s3c2440-dma.c
2 *
3 * (c) 2006 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
5 *
6 * S3C2440 DMA selection
7 *
8 * http://armlinux.simtec.co.uk/
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13*/
14
15#include <linux/kernel.h>
16#include <linux/init.h>
17#include <linux/sysdev.h>
18
19#include <asm/dma.h>
20#include <asm/arch/dma.h>
21#include "dma.h"
22
23#include "cpu.h"
24
25#include <asm/arch/regs-serial.h>
26#include <asm/arch/regs-gpio.h>
27#include <asm/arch/regs-ac97.h>
28#include <asm/arch/regs-mem.h>
29#include <asm/arch/regs-lcd.h>
30#include <asm/arch/regs-sdi.h>
31#include <asm/arch/regs-iis.h>
32#include <asm/arch/regs-spi.h>
33
34static struct s3c24xx_dma_map __initdata s3c2440_dma_mappings[] = {
35 [DMACH_XD0] = {
36 .name = "xdreq0",
37 .channels[0] = S3C2410_DCON_CH0_XDREQ0 | DMA_CH_VALID,
38 },
39 [DMACH_XD1] = {
40 .name = "xdreq1",
41 .channels[1] = S3C2410_DCON_CH1_XDREQ1 | DMA_CH_VALID,
42 },
43 [DMACH_SDI] = {
44 .name = "sdi",
45 .channels[0] = S3C2410_DCON_CH0_SDI | DMA_CH_VALID,
46 .channels[1] = S3C2440_DCON_CH1_SDI | DMA_CH_VALID,
47 .channels[2] = S3C2410_DCON_CH2_SDI | DMA_CH_VALID,
48 .channels[3] = S3C2410_DCON_CH3_SDI | DMA_CH_VALID,
49 .hw_addr.to = S3C2410_PA_IIS + S3C2410_IISFIFO,
50 .hw_addr.from = S3C2410_PA_IIS + S3C2410_IISFIFO,
51 },
52 [DMACH_SPI0] = {
53 .name = "spi0",
54 .channels[1] = S3C2410_DCON_CH1_SPI | DMA_CH_VALID,
55 .hw_addr.to = S3C2410_PA_SPI + S3C2410_SPTDAT,
56 .hw_addr.from = S3C2410_PA_SPI + S3C2410_SPRDAT,
57 },
58 [DMACH_SPI1] = {
59 .name = "spi1",
60 .channels[3] = S3C2410_DCON_CH3_SPI | DMA_CH_VALID,
61 .hw_addr.to = S3C2410_PA_SPI + 0x20 + S3C2410_SPTDAT,
62 .hw_addr.from = S3C2410_PA_SPI + 0x20 + S3C2410_SPRDAT,
63 },
64 [DMACH_UART0] = {
65 .name = "uart0",
66 .channels[0] = S3C2410_DCON_CH0_UART0 | DMA_CH_VALID,
67 .hw_addr.to = S3C2410_PA_UART0 + S3C2410_UTXH,
68 .hw_addr.from = S3C2410_PA_UART0 + S3C2410_URXH,
69 },
70 [DMACH_UART1] = {
71 .name = "uart1",
72 .channels[1] = S3C2410_DCON_CH1_UART1 | DMA_CH_VALID,
73 .hw_addr.to = S3C2410_PA_UART1 + S3C2410_UTXH,
74 .hw_addr.from = S3C2410_PA_UART1 + S3C2410_URXH,
75 },
76 [DMACH_UART2] = {
77 .name = "uart2",
78 .channels[3] = S3C2410_DCON_CH3_UART2 | DMA_CH_VALID,
79 .hw_addr.to = S3C2410_PA_UART2 + S3C2410_UTXH,
80 .hw_addr.from = S3C2410_PA_UART2 + S3C2410_URXH,
81 },
82 [DMACH_TIMER] = {
83 .name = "timer",
84 .channels[0] = S3C2410_DCON_CH0_TIMER | DMA_CH_VALID,
85 .channels[2] = S3C2410_DCON_CH2_TIMER | DMA_CH_VALID,
86 .channels[3] = S3C2410_DCON_CH3_TIMER | DMA_CH_VALID,
87 },
88 [DMACH_I2S_IN] = {
89 .name = "i2s-sdi",
90 .channels[1] = S3C2410_DCON_CH1_I2SSDI | DMA_CH_VALID,
91 .channels[2] = S3C2410_DCON_CH2_I2SSDI | DMA_CH_VALID,
92 .hw_addr.from = S3C2410_PA_IIS + S3C2410_IISFIFO,
93 },
94 [DMACH_I2S_OUT] = {
95 .name = "i2s-sdo",
96 .channels[0] = S3C2440_DCON_CH0_I2SSDO | DMA_CH_VALID,
97 .channels[2] = S3C2410_DCON_CH2_I2SSDO | DMA_CH_VALID,
98 .hw_addr.to = S3C2410_PA_IIS + S3C2410_IISFIFO,
99 },
100 [DMACH_PCM_IN] = {
101 .name = "pcm-in",
102 .channels[0] = S3C2440_DCON_CH0_PCMIN | DMA_CH_VALID,
103 .channels[2] = S3C2440_DCON_CH2_PCMIN | DMA_CH_VALID,
104 .hw_addr.from = S3C2440_PA_AC97 + S3C_AC97_PCM_DATA,
105 },
106 [DMACH_PCM_OUT] = {
107 .name = "pcm-out",
108 .channels[1] = S3C2440_DCON_CH1_PCMOUT | DMA_CH_VALID,
109 .channels[3] = S3C2440_DCON_CH3_PCMOUT | DMA_CH_VALID,
110 .hw_addr.to = S3C2440_PA_AC97 + S3C_AC97_PCM_DATA,
111 },
112 [DMACH_MIC_IN] = {
113 .name = "mic-in",
114 .channels[2] = S3C2440_DCON_CH2_MICIN | DMA_CH_VALID,
115 .channels[3] = S3C2440_DCON_CH3_MICIN | DMA_CH_VALID,
116 .hw_addr.from = S3C2440_PA_AC97 + S3C_AC97_MIC_DATA,
117 },
118 [DMACH_USB_EP1] = {
119 .name = "usb-ep1",
120 .channels[0] = S3C2410_DCON_CH0_USBEP1 | DMA_CH_VALID,
121 },
122 [DMACH_USB_EP2] = {
123 .name = "usb-ep2",
124 .channels[1] = S3C2410_DCON_CH1_USBEP2 | DMA_CH_VALID,
125 },
126 [DMACH_USB_EP3] = {
127 .name = "usb-ep3",
128 .channels[2] = S3C2410_DCON_CH2_USBEP3 | DMA_CH_VALID,
129 },
130 [DMACH_USB_EP4] = {
131 .name = "usb-ep4",
132 .channels[3] = S3C2410_DCON_CH3_USBEP4 | DMA_CH_VALID,
133 },
134};
135
136static void s3c2440_dma_select(struct s3c2410_dma_chan *chan,
137 struct s3c24xx_dma_map *map)
138{
139 chan->dcon = map->channels[chan->number] & ~DMA_CH_VALID;
140}
141
142static struct s3c24xx_dma_selection __initdata s3c2440_dma_sel = {
143 .select = s3c2440_dma_select,
144 .dcon_mask = 7 << 24,
145 .map = s3c2440_dma_mappings,
146 .map_size = ARRAY_SIZE(s3c2440_dma_mappings),
147};
148
149static int s3c2440_dma_add(struct sys_device *sysdev)
150{
151 return s3c24xx_dma_init_map(&s3c2440_dma_sel);
152}
153
154static struct sysdev_driver s3c2440_dma_driver = {
155 .add = s3c2440_dma_add,
156};
157
158static int __init s3c2440_dma_init(void)
159{
160 return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_dma_driver);
161}
162
163arch_initcall(s3c2440_dma_init);
164
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-13 15:20:54 -0500
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/* Advanced  Micro Devices Inc. AMD8111E Linux Network Driver 
 * Copyright (C) 2004 Advanced Micro Devices 
 *
 * 
 * Copyright 2001,2002 Jeff Garzik <jgarzik@mandrakesoft.com> [ 8139cp.c,tg3.c ]
 * Copyright (C) 2001, 2002 David S. Miller (davem@redhat.com)[ tg3.c]
 * Copyright 1996-1999 Thomas Bogendoerfer [ pcnet32.c ]
 * Derived from the lance driver written 1993,1994,1995 by Donald Becker.
 * Copyright 1993 United States Government as represented by the
 *	Director, National Security Agency.[ pcnet32.c ]
 * Carsten Langgaard, carstenl@mips.com [ pcnet32.c ]
 * Copyright (C) 2000 MIPS Technologies, Inc.  All rights reserved.
 *
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 
 * USA
  
Module Name:

	amd8111e.c

Abstract:
	
 	 AMD8111 based 10/100 Ethernet Controller Driver. 

Environment:

	Kernel Mode

Revision History:
 	3.0.0
	   Initial Revision.
	3.0.1
	 1. Dynamic interrupt coalescing.
	 2. Removed prev_stats.
	 3. MII support.
	 4. Dynamic IPG support
	3.0.2  05/29/2003
	 1. Bug fix: Fixed failure to send jumbo packets larger than 4k.
	 2. Bug fix: Fixed VLAN support failure.
	 3. Bug fix: Fixed receive interrupt coalescing bug.
	 4. Dynamic IPG support is disabled by default.
	3.0.3 06/05/2003
	 1. Bug fix: Fixed failure to close the interface if SMP is enabled.
	3.0.4 12/09/2003
	 1. Added set_mac_address routine for bonding driver support.
	 2. Tested the driver for bonding support
	 3. Bug fix: Fixed mismach in actual receive buffer lenth and lenth 
	    indicated to the h/w.
	 4. Modified amd8111e_rx() routine to receive all the received packets 
	    in the first interrupt.
	 5. Bug fix: Corrected  rx_errors  reported in get_stats() function.
	3.0.5 03/22/2004
	 1. Added NAPI support  

*/


#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/compiler.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/ethtool.h>
#include <linux/mii.h>
#include <linux/if_vlan.h>
#include <linux/ctype.h>	
#include <linux/crc32.h>
#include <linux/dma-mapping.h>

#include <asm/system.h>
#include <asm/io.h>
#include <asm/byteorder.h>
#include <asm/uaccess.h>

#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
#define AMD8111E_VLAN_TAG_USED 1
#else
#define AMD8111E_VLAN_TAG_USED 0
#endif

#include "amd8111e.h"
#define MODULE_NAME	"amd8111e"
#define MODULE_VERS	"3.0.5"
MODULE_AUTHOR("Advanced Micro Devices, Inc.");
MODULE_DESCRIPTION ("AMD8111 based 10/100 Ethernet Controller. Driver Version 3.0.3");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, amd8111e_pci_tbl);
module_param_array(speed_duplex, int, NULL, 0);
MODULE_PARM_DESC(speed_duplex, "Set device speed and duplex modes, 0: Auto Negotitate, 1: 10Mbps Half Duplex, 2: 10Mbps Full Duplex, 3: 100Mbps Half Duplex, 4: 100Mbps Full Duplex");
module_param_array(coalesce, bool, NULL, 0);
MODULE_PARM_DESC(coalesce, "Enable or Disable interrupt coalescing, 1: Enable, 0: Disable");
module_param_array(dynamic_ipg, bool, NULL, 0);
MODULE_PARM_DESC(dynamic_ipg, "Enable or Disable dynamic IPG, 1: Enable, 0: Disable");

static struct pci_device_id amd8111e_pci_tbl[] = {
		
	{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD8111E_7462,
	 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ 0, }

};
/* 
This function will read the PHY registers.
*/
static int amd8111e_read_phy(struct amd8111e_priv* lp, int phy_id, int reg, u32* val)
{
	void __iomem *mmio = lp->mmio;
	unsigned int reg_val;
	unsigned int repeat= REPEAT_CNT;

	reg_val = readl(mmio + PHY_ACCESS);
	while (reg_val & PHY_CMD_ACTIVE)
		reg_val = readl( mmio + PHY_ACCESS );

	writel( PHY_RD_CMD | ((phy_id & 0x1f) << 21) |
			   ((reg & 0x1f) << 16),  mmio +PHY_ACCESS);
	do{
		reg_val = readl(mmio + PHY_ACCESS);
		udelay(30);  /* It takes 30 us to read/write data */
	} while (--repeat && (reg_val & PHY_CMD_ACTIVE));
	if(reg_val & PHY_RD_ERR)
		goto err_phy_read;
	
	*val = reg_val & 0xffff;
	return 0;
err_phy_read:	
	*val = 0;
	return -EINVAL;
	
}

/* 
This function will write into PHY registers. 
*/
static int amd8111e_write_phy(struct amd8111e_priv* lp,int phy_id, int reg, u32 val)
{
	unsigned int repeat = REPEAT_CNT
	void __iomem *mmio = lp->mmio;
	unsigned int reg_val;

	reg_val = readl(mmio + PHY_ACCESS);
	while (reg_val & PHY_CMD_ACTIVE)
		reg_val = readl( mmio + PHY_ACCESS );

	writel( PHY_WR_CMD | ((phy_id & 0x1f) << 21) |
			   ((reg & 0x1f) << 16)|val, mmio + PHY_ACCESS);

	do{
		reg_val = readl(mmio + PHY_ACCESS);
		udelay(30);  /* It takes 30 us to read/write the data */
	} while (--repeat && (reg_val & PHY_CMD_ACTIVE));
	
	if(reg_val & PHY_RD_ERR)
		goto err_phy_write;
	
	return 0;

err_phy_write:	
	return -EINVAL;
	
}
/* 
This is the mii register read function provided to the mii interface.
*/ 
static int amd8111e_mdio_read(struct net_device * dev, int phy_id, int reg_num)
{
	struct amd8111e_priv* lp = netdev_priv(dev);
	unsigned int reg_val;

	amd8111e_read_phy(lp,phy_id,reg_num,&reg_val);
	return reg_val;
	
}

/* 
This is the mii register write function provided to the mii interface.
*/ 
static void amd8111e_mdio_write(struct net_device * dev, int phy_id, int reg_num, int val)
{
	struct amd8111e_priv* lp = netdev_priv(dev);

	amd8111e_write_phy(lp, phy_id, reg_num, val);
}

/*
This function will set PHY speed. During initialization sets the original speed to 100 full.
*/
static void amd8111e_set_ext_phy(struct net_device *dev)
{
	struct amd8111e_priv *lp = netdev_priv(dev);
	u32 bmcr,advert,tmp;
	
	/* Determine mii register values to set the speed */
	advert = amd8111e_mdio_read(dev, lp->ext_phy_addr, MII_ADVERTISE);
	tmp = advert & ~(ADVERTISE_ALL | ADVERTISE_100BASE4);
	switch (lp->ext_phy_option){

		default:
		case SPEED_AUTONEG: /* advertise all values */
			tmp |= ( ADVERTISE_10HALF|ADVERTISE_10FULL|
				ADVERTISE_100HALF|ADVERTISE_100FULL) ;
			break;
		case SPEED10_HALF:
			tmp |= ADVERTISE_10HALF;
			break;
		case SPEED10_FULL:
			tmp |= ADVERTISE_10FULL;
			break;
		case SPEED100_HALF: 
			tmp |= ADVERTISE_100HALF;
			break;
		case SPEED100_FULL:
			tmp |= ADVERTISE_100FULL;
			break;
	}

	if(advert != tmp)
		amd8111e_mdio_write(dev, lp->ext_phy_addr, MII_ADVERTISE, tmp);
	/* Restart auto negotiation */
	bmcr = amd8111e_mdio_read(dev, lp->ext_phy_addr, MII_BMCR);
	bmcr |= (BMCR_ANENABLE | BMCR_ANRESTART);
	amd8111e_mdio_write(dev, lp->ext_phy_addr, MII_BMCR, bmcr);

}

/* 
This function will unmap skb->data space and will free 
all transmit and receive skbuffs.
*/
static int amd8111e_free_skbs(struct net_device *dev)
{
	struct amd8111e_priv *lp = netdev_priv(dev);
	struct sk_buff* rx_skbuff;
	int i;

	/* Freeing transmit skbs */
	for(i = 0; i < NUM_TX_BUFFERS; i++){
		if(lp->tx_skbuff[i]){
			pci_unmap_single(lp->pci_dev,lp->tx_dma_addr[i],					lp->tx_skbuff[i]->len,PCI_DMA_TODEVICE);
			dev_kfree_skb (lp->tx_skbuff[i]);
			lp->tx_skbuff[i] = NULL;
			lp->tx_dma_addr[i] = 0;
		}
	}
	/* Freeing previously allocated receive buffers */
	for (i = 0; i < NUM_RX_BUFFERS; i++){
		rx_skbuff = lp->rx_skbuff[i];
		if(rx_skbuff != NULL){
			pci_unmap_single(lp->pci_dev,lp->rx_dma_addr[i],
				  lp->rx_buff_len - 2,PCI_DMA_FROMDEVICE);
			dev_kfree_skb(lp->rx_skbuff[i]);
			lp->rx_skbuff[i] = NULL;
			lp->rx_dma_addr[i] = 0;
		}
	}
	
	return 0;
}

/*
This will set the receive buffer length corresponding to the mtu size of networkinterface.
*/
static inline void amd8111e_set_rx_buff_len(struct net_device* dev)
{
	struct amd8111e_priv* lp = netdev_priv(dev);
	unsigned int mtu = dev->mtu;
	
	if (mtu > ETH_DATA_LEN){
		/* MTU + ethernet header + FCS
		+ optional VLAN tag + skb reserve space 2 */

		lp->rx_buff_len = mtu + ETH_HLEN + 10;
		lp->options |= OPTION_JUMBO_ENABLE;
	} else{
		lp->rx_buff_len = PKT_BUFF_SZ;
		lp->options &= ~OPTION_JUMBO_ENABLE;
	}
}

/* 
This function will free all the previously allocated buffers, determine new receive buffer length  and will allocate new receive buffers. This function also allocates and initializes both the transmitter and receive hardware descriptors.
 */
static int amd8111e_init_ring(struct net_device *dev)
{
	struct amd8111e_priv *lp = netdev_priv(dev);
	int i;

	lp->rx_idx = lp->tx_idx = 0;
	lp->tx_complete_idx = 0;
	lp->tx_ring_idx = 0;
	

	if(lp->opened)
		/* Free previously allocated transmit and receive skbs */
		amd8111e_free_skbs(dev);	

	else{
		 /* allocate the tx and rx descriptors */
	     	if((lp->tx_ring = pci_alloc_consistent(lp->pci_dev, 
			sizeof(struct amd8111e_tx_dr)*NUM_TX_RING_DR,
			&lp->tx_ring_dma_addr)) == NULL)
		
			goto err_no_mem;
	
	     	if((lp->rx_ring = pci_alloc_consistent(lp->pci_dev, 
			sizeof(struct amd8111e_rx_dr)*NUM_RX_RING_DR,
			&lp->rx_ring_dma_addr)) == NULL)
		
			goto err_free_tx_ring;

	}
	/* Set new receive buff size */
	amd8111e_set_rx_buff_len(dev);

	/* Allocating receive  skbs */
	for (i = 0; i < NUM_RX_BUFFERS; i++) {

		if (!(lp->rx_skbuff[i] = dev_alloc_skb(lp->rx_buff_len))) {
				/* Release previos allocated skbs */
				for(--i; i >= 0 ;i--)
					dev_kfree_skb(lp->rx_skbuff[i]);
				goto err_free_rx_ring;
		}
		skb_reserve(lp->rx_skbuff[i],2);
	}
        /* Initilaizing receive descriptors */
	for (i = 0; i < NUM_RX_BUFFERS; i++) {
		lp->rx_dma_addr[i] = pci_map_single(lp->pci_dev, 
			lp->rx_skbuff[i]->data,lp->rx_buff_len-2, PCI_DMA_FROMDEVICE);

		lp->rx_ring[i].buff_phy_addr = cpu_to_le32(lp->rx_dma_addr[i]);
		lp->rx_ring[i].buff_count = cpu_to_le16(lp->rx_buff_len-2);
		wmb();
		lp->rx_ring[i].rx_flags = cpu_to_le16(OWN_BIT);
	}

	/* Initializing transmit descriptors */
	for (i = 0; i < NUM_TX_RING_DR; i++) {
		lp->tx_ring[i].buff_phy_addr = 0;
		lp->tx_ring[i].tx_flags = 0;
		lp->tx_ring[i].buff_count = 0;
	}

	return 0;

err_free_rx_ring:
	
	pci_free_consistent(lp->pci_dev, 
		sizeof(struct amd8111e_rx_dr)*NUM_RX_RING_DR,lp->rx_ring,
		lp->rx_ring_dma_addr);

err_free_tx_ring:
	
	pci_free_consistent(lp->pci_dev,
		 sizeof(struct amd8111e_tx_dr)*NUM_TX_RING_DR,lp->tx_ring, 
		 lp->tx_ring_dma_addr);

err_no_mem:
	return -ENOMEM;
}
/* This function will set the interrupt coalescing according to the input arguments */
static int amd8111e_set_coalesce(struct net_device * dev, enum coal_mode cmod)
{
	unsigned int timeout;
	unsigned int event_count;

	struct amd8111e_priv *lp = netdev_priv(dev);
	void __iomem *mmio = lp->mmio;
	struct amd8111e_coalesce_conf * coal_conf = &lp->coal_conf;


	switch(cmod)
	{
		case RX_INTR_COAL :
			timeout = coal_conf->rx_timeout;
			event_count = coal_conf->rx_event_count;
			if( timeout > MAX_TIMEOUT || 
					event_count > MAX_EVENT_COUNT ) 
			return -EINVAL;

			timeout = timeout * DELAY_TIMER_CONV; 
			writel(VAL0|STINTEN, mmio+INTEN0);
			writel((u32)DLY_INT_A_R0|( event_count<< 16 )|timeout,
							mmio+DLY_INT_A);
			break;

		case TX_INTR_COAL :
			timeout = coal_conf->tx_timeout;
			event_count = coal_conf->tx_event_count;
			if( timeout > MAX_TIMEOUT || 
					event_count > MAX_EVENT_COUNT ) 
			return -EINVAL;

		   
			timeout = timeout * DELAY_TIMER_CONV; 
			writel(VAL0|STINTEN,mmio+INTEN0);
			writel((u32)DLY_INT_B_T0|( event_count<< 16 )|timeout,
							 mmio+DLY_INT_B);
			break;

		case DISABLE_COAL:
			writel(0,mmio+STVAL);
			writel(STINTEN, mmio+INTEN0);
			writel(0, mmio +DLY_INT_B);
			writel(0, mmio+DLY_INT_A);
			break;
		 case ENABLE_COAL: 
		       /* Start the timer */
			writel((u32)SOFT_TIMER_FREQ, mmio+STVAL); /*  0.5 sec */
			writel(VAL0|STINTEN, mmio+INTEN0);
			break;
		default:
			break;

   }
	return 0;

}

/* 
This function initializes the device registers  and starts the device.  
*/
static int amd8111e_restart(struct net_device *dev)
{
	struct amd8111e_priv *lp = netdev_priv(dev);
	void __iomem *mmio = lp->mmio;
	int i,reg_val;

	/* stop the chip */
	 writel(RUN, mmio + CMD0);

	if(amd8111e_init_ring(dev))
		return -ENOMEM;

	/* enable the port manager and set auto negotiation always */
	writel((u32) VAL1|EN_PMGR, mmio + CMD3 );
	writel((u32)XPHYANE|XPHYRST , mmio + CTRL2); 
	
	amd8111e_set_ext_phy(dev);

	/* set control registers */
	reg_val = readl(mmio + CTRL1);
	reg_val &= ~XMTSP_MASK;
	writel( reg_val| XMTSP_128 | CACHE_ALIGN, mmio + CTRL1 );

	/* enable interrupt */
	writel( APINT5EN | APINT4EN | APINT3EN | APINT2EN | APINT1EN | 
		APINT0EN | MIIPDTINTEN | MCCIINTEN | MCCINTEN | MREINTEN |
		SPNDINTEN | MPINTEN | SINTEN | STINTEN, mmio + INTEN0);

	writel(VAL3 | LCINTEN | VAL1 | TINTEN0 | VAL0 | RINTEN0, mmio + INTEN0);

	/* initialize tx and rx ring base addresses */
	writel((u32)lp->tx_ring_dma_addr,mmio + XMT_RING_BASE_ADDR0);
	writel((u32)lp->rx_ring_dma_addr,mmio+ RCV_RING_BASE_ADDR0);

	writew((u32)NUM_TX_RING_DR, mmio + XMT_RING_LEN0);
	writew((u16)NUM_RX_RING_DR, mmio + RCV_RING_LEN0);
	
	/* set default IPG to 96 */
	writew((u32)DEFAULT_IPG,mmio+IPG);
	writew((u32)(DEFAULT_IPG-IFS1_DELTA), mmio + IFS1); 

	if(lp->options & OPTION_JUMBO_ENABLE){
		writel((u32)VAL2|JUMBO, mmio + CMD3);
		/* Reset REX_UFLO */
		writel( REX_UFLO, mmio + CMD2);
		/* Should not set REX_UFLO for jumbo frames */
		writel( VAL0 | APAD_XMT|REX_RTRY , mmio + CMD2);
	}else{
		writel( VAL0 | APAD_XMT | REX_RTRY|REX_UFLO, mmio + CMD2);
		writel((u32)JUMBO, mmio + CMD3);
	}

#if AMD8111E_VLAN_TAG_USED
	writel((u32) VAL2|VSIZE|VL_TAG_DEL, mmio + CMD3);
#endif
	writel( VAL0 | APAD_XMT | REX_RTRY, mmio + CMD2 );
	
	/* Setting the MAC address to the device */
	for(i = 0; i < ETH_ADDR_LEN; i++)
		writeb( dev->dev_addr[i], mmio + PADR + i ); 

	/* Enable interrupt coalesce */
	if(lp->options & OPTION_INTR_COAL_ENABLE){
		printk(KERN_INFO "%s: Interrupt Coalescing Enabled.\n",
								dev->name);
		amd8111e_set_coalesce(dev,ENABLE_COAL);
	}
	
	/* set RUN bit to start the chip */
	writel(VAL2 | RDMD0, mmio + CMD0);
	writel(VAL0 | INTREN | RUN, mmio + CMD0);
	
	/* To avoid PCI posting bug */
	readl(mmio+CMD0);
	return 0;
}
/* 
This function clears necessary the device registers. 
*/	
static void amd8111e_init_hw_default( struct amd8111e_priv* lp)
{
	unsigned int reg_val;
	unsigned int logic_filter[2] ={0,};
	void __iomem *mmio = lp->mmio;


        /* stop the chip */
	writel(RUN, mmio + CMD0);

	/* AUTOPOLL0 Register *//*TBD default value is 8100 in FPS */
	writew( 0x8100 | lp->ext_phy_addr, mmio + AUTOPOLL0);

	/* Clear RCV_RING_BASE_ADDR */
	writel(0, mmio + RCV_RING_BASE_ADDR0);

	/* Clear XMT_RING_BASE_ADDR */
	writel(0, mmio + XMT_RING_BASE_ADDR0);
	writel(0, mmio + XMT_RING_BASE_ADDR1);
	writel(0, mmio + XMT_RING_BASE_ADDR2);
	writel(0, mmio + XMT_RING_BASE_ADDR3);

	/* Clear CMD0  */
	writel(CMD0_CLEAR,mmio + CMD0);
	
	/* Clear CMD2 */
	writel(CMD2_CLEAR, mmio +CMD2);

	/* Clear CMD7 */
	writel(CMD7_CLEAR , mmio + CMD7);

	/* Clear DLY_INT_A and DLY_INT_B */
	writel(0x0, mmio + DLY_INT_A);
	writel(0x0, mmio + DLY_INT_B);

	/* Clear FLOW_CONTROL */
	writel(0x0, mmio + FLOW_CONTROL);

	/* Clear INT0  write 1 to clear register */
	reg_val = readl(mmio + INT0);
	writel(reg_val, mmio + INT0);

	/* Clear STVAL */
	writel(0x0, mmio + STVAL);

	/* Clear INTEN0 */
	writel( INTEN0_CLEAR, mmio + INTEN0);

	/* Clear LADRF */
	writel(0x0 , mmio + LADRF);

	/* Set SRAM_SIZE & SRAM_BOUNDARY registers  */
	writel( 0x80010,mmio + SRAM_SIZE);

	/* Clear RCV_RING0_LEN */
	writel(0x0, mmio +  RCV_RING_LEN0);

	/* Clear XMT_RING0/1/2/3_LEN */
	writel(0x0, mmio +  XMT_RING_LEN0);
	writel(0x0, mmio +  XMT_RING_LEN1);
	writel(0x0, mmio +  XMT_RING_LEN2);
	writel(0x0, mmio +  XMT_RING_LEN3);

	/* Clear XMT_RING_LIMIT */
	writel(0x0, mmio + XMT_RING_LIMIT);

	/* Clear MIB */
	writew(MIB_CLEAR, mmio + MIB_ADDR);

	/* Clear LARF */
	amd8111e_writeq(*(u64*)logic_filter,mmio+LADRF);

	/* SRAM_SIZE register */
	reg_val = readl(mmio + SRAM_SIZE);
	
	if(lp->options & OPTION_JUMBO_ENABLE)
		writel( VAL2|JUMBO, mmio + CMD3);
#if AMD8111E_VLAN_TAG_USED
	writel(VAL2|VSIZE|VL_TAG_DEL, mmio + CMD3 );
#endif
	/* Set default value to CTRL1 Register */
	writel(CTRL1_DEFAULT, mmio + CTRL1);

	/* To avoid PCI posting bug */
	readl(mmio + CMD2);

}

/* 
This function disables the interrupt and clears all the pending 
interrupts in INT0
 */
static void amd8111e_disable_interrupt(struct amd8111e_priv* lp)
{	
	u32 intr0;

	/* Disable interrupt */
	writel(INTREN, lp->mmio + CMD0);
	
	/* Clear INT0 */
	intr0 = readl(lp->mmio + INT0);
	writel(intr0, lp->mmio + INT0);
	
	/* To avoid PCI posting bug */
	readl(lp->mmio + INT0);

}

/*
This function stops the chip. 
*/
static void amd8111e_stop_chip(struct amd8111e_priv* lp)
{
	writel(RUN, lp->mmio + CMD0);
	
	/* To avoid PCI posting bug */
	readl(lp->mmio + CMD0);
}

/* 
This function frees the  transmiter and receiver descriptor rings.
*/
static void amd8111e_free_ring(struct amd8111e_priv* lp)
{	

	/* Free transmit and receive skbs */
	amd8111e_free_skbs(lp->amd8111e_net_dev);

	/* Free transmit and receive descriptor rings */
	if(lp->rx_ring){
		pci_free_consistent(lp->pci_dev, 
			sizeof(struct amd8111e_rx_dr)*NUM_RX_RING_DR,
			lp->rx_ring, lp->rx_ring_dma_addr);
		lp->rx_ring = NULL;
	}
	
	if(lp->tx_ring){
		pci_free_consistent(lp->pci_dev, 
			sizeof(struct amd8111e_tx_dr)*NUM_TX_RING_DR,
			lp->tx_ring, lp->tx_ring_dma_addr);

		lp->tx_ring = NULL;
	}

}
#if AMD8111E_VLAN_TAG_USED	
/* 
This is the receive indication function for packets with vlan tag.
*/	
static int amd8111e_vlan_rx(struct amd8111e_priv *lp, struct sk_buff *skb, u16 vlan_tag)
{
#ifdef CONFIG_AMD8111E_NAPI
	return vlan_hwaccel_receive_skb(skb, lp->vlgrp,vlan_tag);
#else
	return vlan_hwaccel_rx(skb, lp->vlgrp, vlan_tag);
#endif /* CONFIG_AMD8111E_NAPI */
}
#endif

/*
This function will free all the transmit skbs that are actually transmitted by the device. It will check the ownership of the skb before freeing the skb. 
*/
static int amd8111e_tx(struct net_device *dev)
{
	struct amd8111e_priv* lp = netdev_priv(dev);
	int tx_index = lp->tx_complete_idx & TX_RING_DR_MOD_MASK;
	int status;
	/* Complete all the transmit packet */
	while (lp->tx_complete_idx != lp->tx_idx){
		tx_index =  lp->tx_complete_idx & TX_RING_DR_MOD_MASK;
		status = le16_to_cpu(lp->tx_ring[tx_index].tx_flags);

		if(status & OWN_BIT)
			break;	/* It still hasn't been Txed */

		lp->tx_ring[tx_index].buff_phy_addr = 0;

		/* We must free the original skb */
		if (lp->tx_skbuff[tx_index]) {
			pci_unmap_single(lp->pci_dev, lp->tx_dma_addr[tx_index],
				  	lp->tx_skbuff[tx_index]->len,
					PCI_DMA_TODEVICE);
			dev_kfree_skb_irq (lp->tx_skbuff[tx_index]);
			lp->tx_skbuff[tx_index] = NULL;
			lp->tx_dma_addr[tx_index] = 0;
		}
		lp->tx_complete_idx++;
		/*COAL update tx coalescing parameters */
		lp->coal_conf.tx_packets++;
		lp->coal_conf.tx_bytes += lp->tx_ring[tx_index].buff_count;	

		if (netif_queue_stopped(dev) &&
			lp->tx_complete_idx > lp->tx_idx - NUM_TX_BUFFERS +2){
			/* The ring is no longer full, clear tbusy. */
			/* lp->tx_full = 0; */
			netif_wake_queue (dev);
		}
	}
	return 0;
}

#ifdef CONFIG_AMD8111E_NAPI
/* This function handles the driver receive operation in polling mode */
static int amd8111e_rx_poll(struct net_device *dev, int * budget)
{
	struct amd8111e_priv *lp = netdev_priv(dev);
	int rx_index = lp->rx_idx & RX_RING_DR_MOD_MASK;
	void __iomem *mmio = lp->mmio;
	struct sk_buff *skb,*new_skb;
	int min_pkt_len, status;
	unsigned int intr0;
	int num_rx_pkt = 0;
	/*int max_rx_pkt = NUM_RX_BUFFERS;*/
	short pkt_len;
#if AMD8111E_VLAN_TAG_USED		
	short vtag;
#endif
	int rx_pkt_limit = dev->quota;
	unsigned long flags;
	
	do{   
		/* process receive packets until we use the quota*/
		/* If we own the next entry, it's a new packet. Send it up. */
		while(1) {
			status = le16_to_cpu(lp->rx_ring[rx_index].rx_flags);
			if (status & OWN_BIT)
				break;

			/* 
			 * There is a tricky error noted by John Murphy,
			 * <murf@perftech.com> to Russ Nelson: Even with
			 * full-sized * buffers it's possible for a  
			 * jabber packet to use two buffers, with only 
			 * the last correctly noting the error.
			 */

			if(status & ERR_BIT) {
				/* reseting flags */
				lp->rx_ring[rx_index].rx_flags &= RESET_RX_FLAGS;
				goto err_next_pkt;
			}
			/* check for STP and ENP */
			if(!((status & STP_BIT) && (status & ENP_BIT))){
				/* reseting flags */
				lp->rx_ring[rx_index].rx_flags &= RESET_RX_FLAGS;
				goto err_next_pkt;
			}
			pkt_len = le16_to_cpu(lp->rx_ring[rx_index].msg_count) - 4;

#if AMD8111E_VLAN_TAG_USED		
			vtag = status & TT_MASK;
			/*MAC will strip vlan tag*/ 
			if(lp->vlgrp != NULL && vtag !=0)
				min_pkt_len =MIN_PKT_LEN - 4;
			else
#endif
				min_pkt_len =MIN_PKT_LEN;

			if (pkt_len < min_pkt_len) {
				lp->rx_ring[rx_index].rx_flags &= RESET_RX_FLAGS;
				lp->drv_rx_errors++;
				goto err_next_pkt;
			}
			if(--rx_pkt_limit < 0)
				goto rx_not_empty;
			if(!(new_skb = dev_alloc_skb(lp->rx_buff_len))){
				/* if allocation fail, 
				   ignore that pkt and go to next one */
				lp->rx_ring[rx_index].rx_flags &= RESET_RX_FLAGS;
				lp->drv_rx_errors++;
				goto err_next_pkt;
			}
		
			skb_reserve(new_skb, 2);
			skb = lp->rx_skbuff[rx_index];
			pci_unmap_single(lp->pci_dev,lp->rx_dma_addr[rx_index],
					 lp->rx_buff_len-2, PCI_DMA_FROMDEVICE);
			skb_put(skb, pkt_len);
			skb->dev = dev;
			lp->rx_skbuff[rx_index] = new_skb;
			new_skb->dev = dev;
			lp->rx_dma_addr[rx_index] = pci_map_single(lp->pci_dev,
								   new_skb->data,
								   lp->rx_buff_len-2,
								   PCI_DMA_FROMDEVICE);
	
			skb->protocol = eth_type_trans(skb, dev);

#if AMD8111E_VLAN_TAG_USED		
			if(lp->vlgrp != NULL && (vtag == TT_VLAN_TAGGED)){
				amd8111e_vlan_rx(lp, skb,
					 le16_to_cpu(lp->rx_ring[rx_index].tag_ctrl_info));
			} else
#endif
				netif_receive_skb(skb);
			/*COAL update rx coalescing parameters*/
			lp->coal_conf.rx_packets++;
			lp->coal_conf.rx_bytes += pkt_len;	
			num_rx_pkt++;
			dev->last_rx = jiffies;
	
		err_next_pkt:	
			lp->rx_ring[rx_index].buff_phy_addr
				= cpu_to_le32(lp->rx_dma_addr[rx_index]);
			lp->rx_ring[rx_index].buff_count = 
				cpu_to_le16(lp->rx_buff_len-2);
			wmb();
			lp->rx_ring[rx_index].rx_flags |= cpu_to_le16(OWN_BIT);
			rx_index = (++lp->rx_idx) & RX_RING_DR_MOD_MASK;
		}
		/* Check the interrupt status register for more packets in the 
		   mean time. Process them since we have not used up our quota.*/

		intr0 = readl(mmio + INT0);
		/*Ack receive packets */
		writel(intr0 & RINT0,mmio + INT0);

	} while(intr0 & RINT0);

	/* Receive descriptor is empty now */
	dev->quota -= num_rx_pkt;
	*budget -= num_rx_pkt;

	spin_lock_irqsave(&lp->lock, flags);
	netif_rx_complete(dev);
	writel(VAL0|RINTEN0, mmio + INTEN0);
	writel(VAL2 | RDMD0, mmio + CMD0);
	spin_unlock_irqrestore(&lp->lock, flags);
	return 0;

rx_not_empty:
	/* Do not call a netif_rx_complete */
	dev->quota -= num_rx_pkt;	
	*budget -= num_rx_pkt;
	return 1;
}

#else
/* 
This function will check the ownership of receive buffers and descriptors. It will indicate to kernel up to half the number of maximum receive buffers in the descriptor ring, in a single receive interrupt. It will also replenish the descriptors with new skbs.
*/
static int amd8111e_rx(struct net_device *dev)
{
	struct amd8111e_priv *lp = netdev_priv(dev);
	struct sk_buff *skb,*new_skb;
	int rx_index = lp->rx_idx & RX_RING_DR_MOD_MASK;
	int min_pkt_len, status;
	int num_rx_pkt = 0;
	int max_rx_pkt = NUM_RX_BUFFERS;
	short pkt_len;
#if AMD8111E_VLAN_TAG_USED		
	short vtag;
#endif
	
	/* If we own the next entry, it's a new packet. Send it up. */
	while(++num_rx_pkt <= max_rx_pkt){
		status = le16_to_cpu(lp->rx_ring[rx_index].rx_flags);
		if(status & OWN_BIT)
			return 0;
	       
		/* check if err summary bit is set */ 
		if(status & ERR_BIT){
			/* 
			 * There is a tricky error noted by John Murphy,
			 * <murf@perftech.com> to Russ Nelson: Even with full-sized
			 * buffers it's possible for a jabber packet to use two
			 * buffers, with only the last correctly noting the error.			 */
			/* reseting flags */
			lp->rx_ring[rx_index].rx_flags &= RESET_RX_FLAGS;
			goto err_next_pkt;
		}
		/* check for STP and ENP */
		if(!((status & STP_BIT) && (status & ENP_BIT))){
			/* reseting flags */
			lp->rx_ring[rx_index].rx_flags &= RESET_RX_FLAGS;
			goto err_next_pkt;
		}
		pkt_len = le16_to_cpu(lp->rx_ring[rx_index].msg_count) - 4;

#if AMD8111E_VLAN_TAG_USED		
		vtag = status & TT_MASK;
		/*MAC will strip vlan tag*/ 
		if(lp->vlgrp != NULL && vtag !=0)
			min_pkt_len =MIN_PKT_LEN - 4;
		else
#endif
			min_pkt_len =MIN_PKT_LEN;

		if (pkt_len < min_pkt_len) {
			lp->rx_ring[rx_index].rx_flags &= RESET_RX_FLAGS;
			lp->drv_rx_errors++;
			goto err_next_pkt;
		}
		if(!(new_skb = dev_alloc_skb(lp->rx_buff_len))){
			/* if allocation fail, 
				ignore that pkt and go to next one */
			lp->rx_ring[rx_index].rx_flags &= RESET_RX_FLAGS;
			lp->drv_rx_errors++;
			goto err_next_pkt;
		}
		
		skb_reserve(new_skb, 2);
		skb = lp->rx_skbuff[rx_index];
		pci_unmap_single(lp->pci_dev,lp->rx_dma_addr[rx_index],
			lp->rx_buff_len-2, PCI_DMA_FROMDEVICE);
		skb_put(skb, pkt_len);
		skb->dev = dev;
		lp->rx_skbuff[rx_index] = new_skb;
		new_skb->dev = dev;
		lp->rx_dma_addr[rx_index] = pci_map_single(lp->pci_dev,
			new_skb->data, lp->rx_buff_len-2,PCI_DMA_FROMDEVICE);
	
		skb->protocol = eth_type_trans(skb, dev);

#if AMD8111E_VLAN_TAG_USED				
		if(lp->vlgrp != NULL && (vtag == TT_VLAN_TAGGED)){
			amd8111e_vlan_rx(lp, skb,
				 le16_to_cpu(lp->rx_ring[rx_index].tag_ctrl_info));
		} else
#endif
			
			netif_rx (skb);
			/*COAL update rx coalescing parameters*/
			lp->coal_conf.rx_packets++;
			lp->coal_conf.rx_bytes += pkt_len;	

			dev->last_rx = jiffies;
	
err_next_pkt:
		lp->rx_ring[rx_index].buff_phy_addr
			 = cpu_to_le32(lp->rx_dma_addr[rx_index]);
		lp->rx_ring[rx_index].buff_count = 
				cpu_to_le16(lp->rx_buff_len-2);
		wmb();
		lp->rx_ring[rx_index].rx_flags |= cpu_to_le16(OWN_BIT);
		rx_index = (++lp->rx_idx) & RX_RING_DR_MOD_MASK;
	}

	return 0;
}
#endif /* CONFIG_AMD8111E_NAPI */
/* 
This function will indicate the link status to the kernel.
*/
static int amd8111e_link_change(struct net_device* dev)
{	
	struct amd8111e_priv *lp = netdev_priv(dev);
	int status0,speed;

	/* read the link change */
     	status0 = readl(lp->mmio + STAT0);
	
	if(status0 & LINK_STATS){
		if(status0 & AUTONEG_COMPLETE)
			lp->link_config.autoneg = AUTONEG_ENABLE;
		else 
			lp->link_config.autoneg = AUTONEG_DISABLE;

		if(status0 & FULL_DPLX)
			lp->link_config.duplex = DUPLEX_FULL;
		else 
			lp->link_config.duplex = DUPLEX_HALF;
		speed = (status0 & SPEED_MASK) >> 7;
		if(speed == PHY_SPEED_10)
			lp->link_config.speed = SPEED_10;
		else if(speed == PHY_SPEED_100)
			lp->link_config.speed = SPEED_100;

		printk(KERN_INFO "%s: Link is Up. Speed is %s Mbps %s Duplex\n",			dev->name,
		       (lp->link_config.speed == SPEED_100) ? "100": "10", 
		       (lp->link_config.duplex == DUPLEX_FULL)? "Full": "Half"); 
		netif_carrier_on(dev);
	}
	else{	
		lp->link_config.speed = SPEED_INVALID;
		lp->link_config.duplex = DUPLEX_INVALID;
		lp->link_config.autoneg = AUTONEG_INVALID;
		printk(KERN_INFO "%s: Link is Down.\n",dev->name);
		netif_carrier_off(dev);
	}
		
	return 0;
}
/*
This function reads the mib counters. 	 
*/
static int amd8111e_read_mib(void __iomem *mmio, u8 MIB_COUNTER)
{
	unsigned int  status;
	unsigned  int data;
	unsigned int repeat = REPEAT_CNT;

	writew( MIB_RD_CMD | MIB_COUNTER, mmio + MIB_ADDR);
	do {
		status = readw(mmio + MIB_ADDR);
		udelay(2);	/* controller takes MAX 2 us to get mib data */
	}
	while (--repeat && (status & MIB_CMD_ACTIVE));

	data = readl(mmio + MIB_DATA);
	return data;
}

/*
This function reads the mib registers and returns the hardware statistics. It  updates previous internal driver statistics with new values.
*/ 
static struct net_device_stats *amd8111e_get_stats(struct net_device * dev)
{
	struct amd8111e_priv *lp = netdev_priv(dev);
	void __iomem *mmio = lp->mmio;
	unsigned long flags;
	/* struct net_device_stats *prev_stats = &lp->prev_stats; */
	struct net_device_stats* new_stats = &lp->stats;
	
	if(!lp->opened)
		return &lp->stats;	
	spin_lock_irqsave (&lp->lock, flags);

	/* stats.rx_packets */
	new_stats->rx_packets = amd8111e_read_mib(mmio, rcv_broadcast_pkts)+
				amd8111e_read_mib(mmio, rcv_multicast_pkts)+
				amd8111e_read_mib(mmio, rcv_unicast_pkts);

	/* stats.tx_packets */
	new_stats->tx_packets = amd8111e_read_mib(mmio, xmt_packets);

	/*stats.rx_bytes */
	new_stats->rx_bytes = amd8111e_read_mib(mmio, rcv_octets);

	/* stats.tx_bytes */
	new_stats->tx_bytes = amd8111e_read_mib(mmio, xmt_octets);

	/* stats.rx_errors */
	/* hw errors + errors driver reported */
	new_stats->rx_errors = amd8111e_read_mib(mmio, rcv_undersize_pkts)+
				amd8111e_read_mib(mmio, rcv_fragments)+
				amd8111e_read_mib(mmio, rcv_jabbers)+
				amd8111e_read_mib(mmio, rcv_alignment_errors)+
				amd8111e_read_mib(mmio, rcv_fcs_errors)+
				amd8111e_read_mib(mmio, rcv_miss_pkts)+
				lp->drv_rx_errors;

	/* stats.tx_errors */
	new_stats->tx_errors = amd8111e_read_mib(mmio, xmt_underrun_pkts);

	/* stats.rx_dropped*/
	new_stats->rx_dropped = amd8111e_read_mib(mmio, rcv_miss_pkts);

	/* stats.tx_dropped*/
	new_stats->tx_dropped = amd8111e_read_mib(mmio,  xmt_underrun_pkts);

	/* stats.multicast*/
	new_stats->multicast = amd8111e_read_mib(mmio, rcv_multicast_pkts);

	/* stats.collisions*/
	new_stats->collisions = amd8111e_read_mib(mmio, xmt_collisions);

	/* stats.rx_length_errors*/
	new_stats->rx_length_errors = 
		amd8111e_read_mib(mmio, rcv_undersize_pkts)+
		amd8111e_read_mib(mmio, rcv_oversize_pkts);

	/* stats.rx_over_errors*/
	new_stats->rx_over_errors = amd8111e_read_mib(mmio, rcv_miss_pkts);

	/* stats.rx_crc_errors*/
	new_stats->rx_crc_errors = amd8111e_read_mib(mmio, rcv_fcs_errors);

	/* stats.rx_frame_errors*/
	new_stats->rx_frame_errors =
		amd8111e_read_mib(mmio, rcv_alignment_errors);

	/* stats.rx_fifo_errors */
	new_stats->rx_fifo_errors = amd8111e_read_mib(mmio, rcv_miss_pkts);

	/* stats.rx_missed_errors */
	new_stats->rx_missed_errors = amd8111e_read_mib(mmio, rcv_miss_pkts);

	/* stats.tx_aborted_errors*/
	new_stats->tx_aborted_errors = 
		amd8111e_read_mib(mmio, xmt_excessive_collision);

	/* stats.tx_carrier_errors*/
	new_stats->tx_carrier_errors = 
		amd8111e_read_mib(mmio, xmt_loss_carrier);

	/* stats.tx_fifo_errors*/
	new_stats->tx_fifo_errors = amd8111e_read_mib(mmio, xmt_underrun_pkts);

	/* stats.tx_window_errors*/
	new_stats->tx_window_errors =
		amd8111e_read_mib(mmio, xmt_late_collision);

	/* Reset the mibs for collecting new statistics */
	/* writew(MIB_CLEAR, mmio + MIB_ADDR);*/
		
	spin_unlock_irqrestore (&lp->lock, flags);

	return new_stats;
}
/* This function recalculate the interupt coalescing  mode on every interrupt 
according to the datarate and the packet rate.
*/
static int amd8111e_calc_coalesce(struct net_device *dev)
{
	struct amd8111e_priv *lp = netdev_priv(dev);
	struct amd8111e_coalesce_conf * coal_conf = &lp->coal_conf;
	int tx_pkt_rate;
	int rx_pkt_rate;
	int tx_data_rate;
	int rx_data_rate;
	int rx_pkt_size;
	int tx_pkt_size;

	tx_pkt_rate = coal_conf->tx_packets - coal_conf->tx_prev_packets;
	coal_conf->tx_prev_packets =  coal_conf->tx_packets;
	
	tx_data_rate = coal_conf->tx_bytes - coal_conf->tx_prev_bytes;
	coal_conf->tx_prev_bytes =  coal_conf->tx_bytes;
	
	rx_pkt_rate = coal_conf->rx_packets - coal_conf->rx_prev_packets;
	coal_conf->rx_prev_packets =  coal_conf->rx_packets;
	
	rx_data_rate = coal_conf->rx_bytes - coal_conf->rx_prev_bytes;
	coal_conf->rx_prev_bytes =  coal_conf->rx_bytes;
	
	if(rx_pkt_rate < 800){
		if(coal_conf->rx_coal_type != NO_COALESCE){
			
			coal_conf->rx_timeout = 0x0;
			coal_conf->rx_event_count = 0;
			amd8111e_set_coalesce(dev,RX_INTR_COAL);
			coal_conf->rx_coal_type = NO_COALESCE;
		}
	}
	else{
	
		rx_pkt_size = rx_data_rate/rx_pkt_rate;
		if (rx_pkt_size < 128){
			if(coal_conf->rx_coal_type != NO_COALESCE){
			
				coal_conf->rx_timeout = 0;
				coal_conf->rx_event_count = 0;
				amd8111e_set_coalesce(dev,RX_INTR_COAL);
				coal_conf->rx_coal_type = NO_COALESCE;
			}

		}
		else if ( (rx_pkt_size >= 128) && (rx_pkt_size < 512) ){
	
			if(coal_conf->rx_coal_type !=  LOW_COALESCE){
				coal_conf->rx_timeout = 1;
				coal_conf->rx_event_count = 4;
				amd8111e_set_coalesce(dev,RX_INTR_COAL);
				coal_conf->rx_coal_type = LOW_COALESCE;
			}
		}
		else if ((rx_pkt_size >= 512) && (rx_pkt_size < 1024)){
			
			if(coal_conf->rx_coal_type !=  MEDIUM_COALESCE){
				coal_conf->rx_timeout = 1;
				coal_conf->rx_event_count = 4;
				amd8111e_set_coalesce(dev,RX_INTR_COAL);
				coal_conf->rx_coal_type = MEDIUM_COALESCE;
			}		
				
		}
		else if(rx_pkt_size >= 1024){
			if(coal_conf->rx_coal_type !=  HIGH_COALESCE){
				coal_conf->rx_timeout = 2;
				coal_conf->rx_event_count = 3;
				amd8111e_set_coalesce(dev,RX_INTR_COAL);
				coal_conf->rx_coal_type = HIGH_COALESCE;
			}		
		}
	}
    	/* NOW FOR TX INTR COALESC */
	if(tx_pkt_rate < 800){
		if(coal_conf->tx_coal_type != NO_COALESCE){
			
			coal_conf->tx_timeout = 0x0;
			coal_conf->tx_event_count = 0;
			amd8111e_set_coalesce(dev,TX_INTR_COAL);
			coal_conf->tx_coal_type = NO_COALESCE;
		}
	}
	else{
	
		tx_pkt_size = tx_data_rate/tx_pkt_rate;
		if (tx_pkt_size < 128){
		
			if(coal_conf->tx_coal_type != NO_COALESCE){
			
				coal_conf->tx_timeout = 0;
				coal_conf->tx_event_count = 0;
				amd8111e_set_coalesce(dev,TX_INTR_COAL);
				coal_conf->tx_coal_type = NO_COALESCE;
			}

		}
		else if ( (tx_pkt_size >= 128) && (tx_pkt_size < 512) ){
	
			if(coal_conf->tx_coal_type !=  LOW_COALESCE){
				coal_conf->tx_timeout = 1;
				coal_conf->tx_event_count = 2;
				amd8111e_set_coalesce(dev,TX_INTR_COAL);
				coal_conf->tx_coal_type = LOW_COALESCE;

			}
		}
		else if ((tx_pkt_size >= 512) && (tx_pkt_size < 1024)){
			
			if(coal_conf->tx_coal_type !=  MEDIUM_COALESCE){
				coal_conf->tx_timeout = 2;
				coal_conf->tx_event_count = 5;
				amd8111e_set_coalesce(dev,TX_INTR_COAL);
				coal_conf->tx_coal_type = MEDIUM_COALESCE;
			}		
				
		}
		else if(tx_pkt_size >= 1024){
			if (tx_pkt_size >= 1024){
				if(coal_conf->tx_coal_type !=  HIGH_COALESCE){
					coal_conf->tx_timeout = 4;
					coal_conf->tx_event_count = 8;
					amd8111e_set_coalesce(dev,TX_INTR_COAL);
					coal_conf->tx_coal_type = HIGH_COALESCE;
				}		
			}
		}
	}
	return 0;

}
/*
This is device interrupt function. It handles transmit, receive,link change and hardware timer interrupts.
*/
static irqreturn_t amd8111e_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{

	struct net_device * dev = (struct net_device *) dev_id;
	struct amd8111e_priv *lp = netdev_priv(dev);
	void __iomem *mmio = lp->mmio;
	unsigned int intr0, intren0;
	unsigned int handled = 1;

	if(unlikely(dev == NULL))
		return IRQ_NONE;

	spin_lock(&lp->lock);

	/* disabling interrupt */
	writel(INTREN, mmio + CMD0);

	/* Read interrupt status */
	intr0 = readl(mmio + INT0);
	intren0 = readl(mmio + INTEN0);

	/* Process all the INT event until INTR bit is clear. */

	if (!(intr0 & INTR)){
		handled = 0;
		goto err_no_interrupt;
	}
		 
	/* Current driver processes 4 interrupts : RINT,TINT,LCINT,STINT */
	writel(intr0, mmio + INT0);

	/* Check if Receive Interrupt has occurred. */
#ifdef CONFIG_AMD8111E_NAPI
	if(intr0 & RINT0){
		if(netif_rx_schedule_prep(dev)){
			/* Disable receive interupts */
			writel(RINTEN0, mmio + INTEN0);
			/* Schedule a polling routine */
			__netif_rx_schedule(dev);
		}
		else if (intren0 & RINTEN0) {
			printk("************Driver bug! \
				interrupt while in poll\n");
			/* Fix by disable receive interrupts */
			writel(RINTEN0, mmio + INTEN0);
		}
	}
#else
	if(intr0 & RINT0){
		amd8111e_rx(dev);
		writel(VAL2 | RDMD0, mmio + CMD0);
	}
#endif /* CONFIG_AMD8111E_NAPI */
	/* Check if  Transmit Interrupt has occurred. */
	if(intr0 & TINT0)
		amd8111e_tx(dev);
		
	/* Check if  Link Change Interrupt has occurred. */
	if (intr0 & LCINT)
		amd8111e_link_change(dev);

	/* Check if Hardware Timer Interrupt has occurred. */
	if (intr0 & STINT)
		amd8111e_calc_coalesce(dev);

err_no_interrupt:
	writel( VAL0 | INTREN,mmio + CMD0);
	
	spin_unlock(&lp->lock);
	
	return IRQ_RETVAL(handled);
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void amd8111e_poll(struct net_device *dev)
{ 
	unsigned long flags;
	local_save_flags(flags); 
	local_irq_disable();
	amd8111e_interrupt(0, dev, NULL);
	local_irq_restore(flags); 
} 
#endif


/*
This function closes the network interface and updates the statistics so that most recent statistics will be available after the interface is down.
*/
static int amd8111e_close(struct net_device * dev)
{
	struct amd8111e_priv *lp = netdev_priv(dev);
	netif_stop_queue(dev);
	
	spin_lock_irq(&lp->lock);
	
	amd8111e_disable_interrupt(lp);
	amd8111e_stop_chip(lp);
	amd8111e_free_ring(lp);
	
	netif_carrier_off(lp->amd8111e_net_dev);

	/* Delete ipg timer */
	if(lp->options & OPTION_DYN_IPG_ENABLE)	        
		del_timer_sync(&lp->ipg_data.ipg_timer);

	spin_unlock_irq(&lp->lock);
	free_irq(dev->irq, dev);
	
	/* Update the statistics before closing */
	amd8111e_get_stats(dev);
	lp->opened = 0;
	return 0;
}
/* This function opens new interface.It requests irq for the device, initializes the device,buffers and descriptors, and starts the device. 
*/
static int amd8111e_open(struct net_device * dev )
{
	struct amd8111e_priv *lp = netdev_priv(dev);

	if(dev->irq ==0 || request_irq(dev->irq, amd8111e_interrupt, SA_SHIRQ,
					 dev->name, dev)) 
		return -EAGAIN;

	spin_lock_irq(&lp->lock);

	amd8111e_init_hw_default(lp);

	if(amd8111e_restart(dev)){
		spin_unlock_irq(&lp->lock);
		if (dev->irq)
			free_irq(dev->irq, dev);
		return -ENOMEM;
	}
	/* Start ipg timer */
	if(lp->options & OPTION_DYN_IPG_ENABLE){	        
		add_timer(&lp->ipg_data.ipg_timer);
		printk(KERN_INFO "%s: Dynamic IPG Enabled.\n",dev->name);
	}

	lp->opened = 1;

	spin_unlock_irq(&lp->lock);

	netif_start_queue(dev);

	return 0;		
}
/* 
This function checks if there is any transmit  descriptors available to queue more packet.
*/
static int amd8111e_tx_queue_avail(struct amd8111e_priv* lp )
{	
	int tx_index = lp->tx_idx & TX_BUFF_MOD_MASK;
	if(lp->tx_skbuff[tx_index] != 0)
		return -1;
	else
		return 0;
	
}
/* 
This function will queue the transmit packets to the descriptors and will trigger the send operation. It also initializes the transmit descriptors with buffer physical address, byte count, ownership to hardware etc.
*/

static int amd8111e_start_xmit(struct sk_buff *skb, struct net_device * dev)
{
	struct amd8111e_priv *lp = netdev_priv(dev);
	int tx_index;
	unsigned long flags;

	spin_lock_irqsave(&lp->lock, flags);

	tx_index = lp->tx_idx & TX_RING_DR_MOD_MASK;

	lp->tx_ring[tx_index].buff_count = cpu_to_le16(skb->len);

	lp->tx_skbuff[tx_index] = skb;
	lp->tx_ring[tx_index].tx_flags = 0;

#if AMD8111E_VLAN_TAG_USED
	if((lp->vlgrp != NULL) && vlan_tx_tag_present(skb)){
		lp->tx_ring[tx_index].tag_ctrl_cmd |= 
				cpu_to_le16(TCC_VLAN_INSERT);	
		lp->tx_ring[tx_index].tag_ctrl_info = 
				cpu_to_le16(vlan_tx_tag_get(skb));

	}
#endif
	lp->tx_dma_addr[tx_index] =
	    pci_map_single(lp->pci_dev, skb->data, skb->len, PCI_DMA_TODEVICE);
	lp->tx_ring[tx_index].buff_phy_addr =
	    (u32) cpu_to_le32(lp->tx_dma_addr[tx_index]);

	/*  Set FCS and LTINT bits */
	wmb();
	lp->tx_ring[tx_index].tx_flags |=
	    cpu_to_le16(OWN_BIT | STP_BIT | ENP_BIT|ADD_FCS_BIT|LTINT_BIT);

	lp->tx_idx++;

	/* Trigger an immediate send poll. */
	writel( VAL1 | TDMD0, lp->mmio + CMD0);
	writel( VAL2 | RDMD0,lp->mmio + CMD0);

	dev->trans_start = jiffies;

	if(amd8111e_tx_queue_avail(lp) < 0){
		netif_stop_queue(dev);
	}
	spin_unlock_irqrestore(&lp->lock, flags);
	return 0;
}
/*
This function returns all the memory mapped registers of the device.
*/
static void amd8111e_read_regs(struct amd8111e_priv *lp, u32 *buf)
{
	void __iomem *mmio = lp->mmio;
	/* Read only necessary registers */
	buf[0] = readl(mmio + XMT_RING_BASE_ADDR0);
	buf[1] = readl(mmio + XMT_RING_LEN0);
	buf[2] = readl(mmio + RCV_RING_BASE_ADDR0);
	buf[3] = readl(mmio + RCV_RING_LEN0);
	buf[4] = readl(mmio + CMD0);
	buf[5] = readl(mmio + CMD2);
	buf[6] = readl(mmio + CMD3);
	buf[7] = readl(mmio + CMD7);
	buf[8] = readl(mmio + INT0);
	buf[9] = readl(mmio + INTEN0);
	buf[10] = readl(mmio + LADRF);
	buf[11] = readl(mmio + LADRF+4);
	buf[12] = readl(mmio + STAT0);
}

/*
amd8111e crc generator implementation is different from the kernel
ether_crc() function.
*/
static int amd8111e_ether_crc(int len, char* mac_addr)
{
	int i,byte;
	unsigned char octet;
	u32 crc= INITCRC;

	for(byte=0; byte < len; byte++){
		octet = mac_addr[byte];
		for( i=0;i < 8; i++){
			/*If the next bit form the input stream is 1,subtract				 the divisor (CRC32) from the dividend(crc).*/
			if( (octet & 0x1) ^ (crc & 0x1) ){
				crc >>= 1;
				crc ^= CRC32;
			}
			else
				crc >>= 1;
			
			octet >>= 1;
		}
	}	
	return crc; 
}
/*
This function sets promiscuos mode, all-multi mode or the multicast address 
list to the device.
*/
static void amd8111e_set_multicast_list(struct net_device *dev)
{
	struct dev_mc_list* mc_ptr;
	struct amd8111e_priv *lp = netdev_priv(dev);
	u32 mc_filter[2] ;
	int i,bit_num;
	if(dev->flags & IFF_PROMISC){
		printk(KERN_INFO "%s: Setting  promiscuous mode.\n",dev->name);
		writel( VAL2 | PROM, lp->mmio + CMD2);
		return;
	}
	else
		writel( PROM, lp->mmio + CMD2);
	if(dev->flags & IFF_ALLMULTI || dev->mc_count > MAX_FILTER_SIZE){
		/* get all multicast packet */
		mc_filter[1] = mc_filter[0] = 0xffffffff;
		lp->mc_list = dev->mc_list;
		lp->options |= OPTION_MULTICAST_ENABLE;
		amd8111e_writeq(*(u64*)mc_filter,lp->mmio + LADRF);
		return;
	}
	if( dev->mc_count == 0 ){
		/* get only own packets */
		mc_filter[1] = mc_filter[0] = 0;
		lp->mc_list = NULL;
		lp->options &= ~OPTION_MULTICAST_ENABLE;
		amd8111e_writeq(*(u64*)mc_filter,lp->mmio + LADRF);
		/* disable promiscous mode */
		writel(PROM, lp->mmio + CMD2);
		return;
	}
	/* load all the multicast addresses in the logic filter */
	lp->options |= OPTION_MULTICAST_ENABLE;
	lp->mc_list = dev->mc_list;
	mc_filter[1] = mc_filter[0] = 0;
	for (i = 0, mc_ptr = dev->mc_list; mc_ptr && i < dev->mc_count;
		     i++, mc_ptr = mc_ptr->next) {
		bit_num = ( amd8111e_ether_crc(ETH_ALEN,mc_ptr->dmi_addr)							 >> 26 ) & 0x3f;
		mc_filter[bit_num >> 5] |= 1 << (bit_num & 31);
	}	
	amd8111e_writeq(*(u64*)mc_filter,lp->mmio+ LADRF);

	/* To eliminate PCI posting bug */
	readl(lp->mmio + CMD2);

}

static void amd8111e_get_drvinfo(struct net_device* dev, struct ethtool_drvinfo *info)
{
	struct amd8111e_priv *lp = netdev_priv(dev);
	struct pci_dev *pci_dev = lp->pci_dev;
	strcpy (info->driver, MODULE_NAME);
	strcpy (info->version, MODULE_VERS);
	sprintf(info->fw_version,"%u",chip_version);
	strcpy (info->bus_info, pci_name(pci_dev));
}

static int amd8111e_get_regs_len(struct net_device *dev)
{
	return AMD8111E_REG_DUMP_LEN;
}

static void amd8111e_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *buf)
{
	struct amd8111e_priv *lp = netdev_priv(dev);
	regs->version = 0;
	amd8111e_read_regs(lp, buf);
}

static int amd8111e_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
{
	struct amd8111e_priv *lp = netdev_priv(dev);
	spin_lock_irq(&lp->lock);
	mii_ethtool_gset(&lp->mii_if, ecmd);
	spin_unlock_irq(&lp->lock);
	return 0;
}

static int amd8111e_set_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
{
	struct amd8111e_priv *lp = netdev_priv(dev);
	int res;
	spin_lock_irq(&lp->lock);
	res = mii_ethtool_sset(&lp->mii_if, ecmd);
	spin_unlock_irq(&lp->lock);
	return res;
}

static int amd8111e_nway_reset(struct net_device *dev)
{
	struct amd8111e_priv *lp = netdev_priv(dev);
	return mii_nway_restart(&lp->mii_if);
}

static u32 amd8111e_get_link(struct net_device *dev)
{
	struct amd8111e_priv *lp = netdev_priv(dev);
	return mii_link_ok(&lp->mii_if);
}

static void amd8111e_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol_info)
{
	struct amd8111e_priv *lp = netdev_priv(dev);
	wol_info->supported = WAKE_MAGIC|WAKE_PHY;
	if (lp->options & OPTION_WOL_ENABLE)
		wol_info->wolopts = WAKE_MAGIC;
}

static int amd8111e_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol_info)
{
	struct amd8111e_priv *lp = netdev_priv(dev);
	if (wol_info->wolopts & ~(WAKE_MAGIC|WAKE_PHY))
		return -EINVAL;
	spin_lock_irq(&lp->lock);
	if (wol_info->wolopts & WAKE_MAGIC)
		lp->options |= 
			(OPTION_WOL_ENABLE | OPTION_WAKE_MAGIC_ENABLE);
	else if(wol_info->wolopts & WAKE_PHY)
		lp->options |= 
			(OPTION_WOL_ENABLE | OPTION_WAKE_PHY_ENABLE);
	else
		lp->options &= ~OPTION_WOL_ENABLE; 
	spin_unlock_irq(&lp->lock);
	return 0;
}

static struct ethtool_ops ops = {
	.get_drvinfo = amd8111e_get_drvinfo,
	.get_regs_len = amd8111e_get_regs_len,
	.get_regs = amd8111e_get_regs,
	.get_settings = amd8111e_get_settings,
	.set_settings = amd8111e_set_settings,
	.nway_reset = amd8111e_nway_reset,
	.get_link = amd8111e_get_link,
	.get_wol = amd8111e_get_wol,
	.set_wol = amd8111e_set_wol,
};

/*
This function handles all the  ethtool ioctls. It gives driver info, gets/sets driver speed, gets memory mapped register values, forces auto negotiation, sets/gets WOL options for ethtool application. 
*/
	
static int amd8111e_ioctl(struct net_device * dev , struct ifreq *ifr, int cmd)
{