/*  dm9ks.c: Version 2.03 2005/10/17           A Davicom DM9000A/DM9010 ISA NIC fast Ethernet driver for Linux.	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.  (C)Copyright 1997-2005 DAVICOM Semiconductor,Inc. All Rights Reserved.	V1.00	10/13/2004	Add new function Early transmit & IP/TCP/UDP Checksum			offload enable & flow control is defaultV1.1	12/29/2004	Add Two packet mode & modify RX functionV1.2	01/14/2005	Add Early transmit mode V1.3	03/02/2005	Support kernel 2.6v1.33   06/08/2005	#define DM9KS_MDRAL		0xf4			#define DM9KS_MDRAH		0xf5			V2.00 Spenser - 01/10/2005			- Modification for PXA270 MAINSTONE.			- Modified dmfe_tx_done().			- Add dmfe_timeout().V2.01	10/07/2005	Modified dmfe_timer()			Dected network speed 10/100MV2.02	10/12/2005	Use link change to chage db->Speed			dmfe_open() wait for Link OK  V2.03	11/22/2005	Power-off and Power-on PHY in dmfe_init()			support IOL*/#if defined(MODVERSIONS)#include <linux/modversions.h>#endif#include <linux/config.h>#include <linux/init.h>				#include <linux/delay.h>#include <linux/module.h>#include <linux/ioport.h>#include <linux/netdevice.h>#include <linux/etherdevice.h>#include <linux/skbuff.h>#include <linux/version.h>#include <asm/dma.h>#include <linux/spinlock.h>#include <linux/crc32.h>#ifdef CONFIG_ARCH_MAINSTONE#include <asm/io.h>#include <asm/hardware.h>#include <asm/irq.h>#endif/* Board/System/Debug information/definition ---------------- */#define DM9KS_ID		0x90000A46#define DM9010_ID		0x90100A46/*-------register name-----------------------*/#define DM9KS_NCR		0x00	/* Network control Reg.*/#define DM9KS_NSR		0x01	/* Network Status Reg.*/#define DM9KS_TCR		0x02	/* TX control Reg.*/#define DM9KS_RXCR		0x05	/* RX control Reg.*/#define DM9KS_BPTR		0x08#define DM9KS_EPCR		0x0b#define DM9KS_EPAR		0x0c#define DM9KS_EPDRL		0x0d#define DM9KS_EPDRH		0x0e#define DM9KS_GPR		0x1f	/* General purpose register */#define DM9KS_TCR2		0x2d#define DM9KS_SMCR		0x2f 	/* Special Mode Control Reg.*/#define DM9KS_ETXCSR		0x30	/* Early Transmit control/status Reg.*/#define	DM9KS_TCCR		0x31	/* Checksum cntrol Reg. */#define DM9KS_RCSR		0x32	/* Receive Checksum status Reg.*/#define DM9KS_MRCMDX		0xf0#define DM9KS_MRCMD		0xf2#define DM9KS_MDRAL		0xf4#define DM9KS_MDRAH		0xf5#define DM9KS_MWCMD		0xf8#define DM9KS_TXPLL		0xfc#define DM9KS_TXPLH		0xfd#define DM9KS_ISR		0xfe#define DM9KS_IMR		0xff/*---------------------------------------------*/#define DM9KS_REG05		0x30	/* SKIP_CRC/SKIP_LONG */ #define DM9KS_REGFF		0xA3	/* IMR */#define DM9KS_DISINTR		0x80#define DM9KS_PHY		0x40	/* PHY address 0x01 */#define DM9KS_PKT_RDY		0x01	/* Packet ready to receive *//* Added for PXA of MAINSTONE */#ifdef CONFIG_ARCH_MAINSTONE#include <asm/arch/mainstone.h>#define DM9KS_MIN_IO		(MST_ETH_PHYS + 0x300)#define DM9KS_MAX_IO            (MST_ETH_PHYS + 0x370)#define DM9K_IRQ		MAINSTONE_IRQ(3)#else#define DM9KS_MIN_IO		0x300#define DM9KS_MAX_IO		0x370#define DM9K_IRQ		3#endif#define DM9KS_VID_L		0x28#define DM9KS_VID_H		0x29#define DM9KS_PID_L		0x2A#define DM9KS_PID_H		0x2B#define DM9KS_RX_INTR		0x01#define DM9KS_TX_INTR		0x02#define DM9KS_LINK_INTR		0x20#define DM9KS_DWORD_MODE	1#define DM9KS_BYTE_MODE		2#define DM9KS_WORD_MODE		0#define TRUE			1#define FALSE			0/* Number of continuous Rx packets */#define CONT_RX_PKT_CNT	10 #define DMFE_TIMER_WUT  jiffies+(HZ*5)	/* timer wakeup time : 5 second */#if defined(DM9KS_DEBUG)#define DMFE_DBUG(dbug_now, msg, vaule)\if (dmfe_debug||dbug_now) printk(KERN_ERR "dmfe: %s %x\n", msg, vaule)#else#define DMFE_DBUG(dbug_now, msg, vaule)\if (dbug_now) printk(KERN_ERR "dmfe: %s %x\n", msg, vaule)#endif#ifndef CONFIG_ARCH_MAINSTONE#pragma pack(push, 1)#endiftypedef struct _RX_DESC{	u8 rxbyte;	u8 status;	u16 length;}RX_DESC;typedef union{	u8 buf[4];	RX_DESC desc;} rx_t;#ifndef CONFIG_ARCH_MAINSTONE#pragma pack(pop)#endifenum DM9KS_PHY_mode {	DM9KS_10MHD   = 0, 	DM9KS_100MHD  = 1, 	DM9KS_10MFD   = 4,	DM9KS_100MFD  = 5, 	DM9KS_AUTO    = 8, };/* Structure/enum declaration ------------------------------- */typedef struct board_info { 	u32 reset_counter;		/* counter: RESET */ 	u32 reset_tx_timeout;		/* RESET caused by TX Timeout */ 	u32 io_addr;			/* Register I/O base address */	u32 io_data;			/* Data I/O address */	int tx_pkt_cnt;	u8 op_mode;			/* PHY operation mode */	u8 io_mode;			/* 0:word, 2:byte */	u8 device_wait_reset;		/* device state */	u8 Speed;			/* current speed */	int cont_rx_pkt_cnt;/* current number of continuos rx packets  */	struct timer_list timer;	struct net_device_stats stats;	unsigned char srom[128];	spinlock_t lock;} board_info_t;/* Global variable declaration ----------------------------- *//*static int dmfe_debug = 0;*/static struct net_device * dmfe_dev = NULL;/* For module input parameter */static int mode       = DM9KS_AUTO;static int media_mode = DM9KS_AUTO;static u8  irq        = DM9K_IRQ;static u32 iobase     = DM9KS_MIN_IO;/* function declaration ------------------------------------- */int dmfe_probe(struct net_device *);static int dmfe_open(struct net_device *);static int dmfe_start_xmit(struct sk_buff *, struct net_device *);static void dmfe_tx_done(unsigned long);static void dmfe_packet_receive(struct net_device *);static int dmfe_stop(struct net_device *);static struct net_device_stats * dmfe_get_stats(struct net_device *); static int dmfe_do_ioctl(struct net_device *, struct ifreq *, int);#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)static void dmfe_interrupt(int , void *, struct pt_regs *);#elsestatic irqreturn_t dmfe_interrupt(int , void *, struct pt_regs *);#endifstatic void dmfe_timer(unsigned long);static void dmfe_init_dm9000(struct net_device *);static unsigned long cal_CRC(unsigned char *, unsigned int, u8);static u8 ior(board_info_t *, int);static void iow(board_info_t *, int, u8);static u16 phy_read(board_info_t *, int);static void phy_write(board_info_t *, int, u16);static u16 read_srom_word(board_info_t *, int);static void dm9000_hash_table(struct net_device *);static void dmfe_timeout(struct net_device *);static void dmfe_reset(struct net_device *);#if defined(CHECKSUM)static u8 check_rx_ready(u8);#endif//DECLARE_TASKLET(dmfe_tx_tasklet,dmfe_tx_done,0);/* DM9000 network baord routine ---------------------------- *//*  Search DM9000 board, allocate space and register it*/struct net_device * __init dmfe_probe1(void){	struct net_device *dev;	int err;#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)	dev = init_etherdev(NULL, sizeof(struct board_info));	ether_setup(dev);		#else	dev= alloc_etherdev(sizeof(struct board_info));#endif	if(!dev)		return ERR_PTR(-ENOMEM);     	SET_MODULE_OWNER(dev);	err = dmfe_probe(dev);	if (err)		goto out;#if LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0)	err = register_netdev(dev);	if (err)		goto out1;#endif	return dev;out1:	release_region(dev->base_addr,2);out:#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)	kfree(dev);#else	free_netdev(dev);#endif	return ERR_PTR(err);}int __init dmfe_probe(struct net_device *dev){	struct board_info *db;    /* Point a board information structure */	u32 id_val;	u16 i, dm9000_found = FALSE;	DMFE_DBUG(0, "dmfe_probe()",0);	/* Search All DM9000 serial NIC */	do {		outb(DM9KS_VID_L, iobase);		id_val = inb(iobase + 4);		outb(DM9KS_VID_H, iobase);		id_val |= inb(iobase + 4) << 8;		outb(DM9KS_PID_L, iobase);		id_val |= inb(iobase + 4) << 16;		outb(DM9KS_PID_H, iobase);		id_val |= inb(iobase + 4) << 24;		if (id_val == DM9KS_ID || id_val == DM9010_ID) {						/* Request IO from system */			if(!request_region(iobase, 2, dev->name))				return -ENODEV;			printk("<DM9KS> I/O: %x, VID: %x \n",iobase, id_val);			dm9000_found = TRUE;			/* Allocated board information structure */			memset(dev->priv, 0, sizeof(struct board_info));			db = (board_info_t *)dev->priv;			dmfe_dev    = dev;			db->io_addr  = iobase;			db->io_data = iobase + 4;			/* driver system function */							dev->base_addr 		= iobase;			dev->irq 		= irq;			dev->open 		= &dmfe_open;			dev->hard_start_xmit 	= &dmfe_start_xmit;			dev->watchdog_timeo	= HZ;				dev->tx_timeout		= dmfe_timeout;			dev->stop 		= &dmfe_stop;			dev->get_stats 		= &dmfe_get_stats;			dev->set_multicast_list = &dm9000_hash_table;			dev->do_ioctl 		= &dmfe_do_ioctl;#if defined(CHECKSUM)			dev->features = dev->features | NETIF_F_NO_CSUM;#endif			/* Read SROM content */			for (i=0; i<64; i++)				((u16 *)db->srom)[i] = read_srom_word(db, i);			/* Set Node Address */			for (i=0; i<6; i++)				dev->dev_addr[i] = db->srom[i];		}//end of if()		iobase += 0x10;	}while(!dm9000_found && iobase <= DM9KS_MAX_IO);	return dm9000_found ? 0:-ENODEV;}/*  Open the interface.  The interface is opened whenever "ifconfig" actives it.*/static int dmfe_open(struct net_device *dev){	board_info_t *db = (board_info_t *)dev->priv;	u8 reg_nsr;	int i;	DMFE_DBUG(0, "dmfe_open", 0);	if (request_irq(dev->irq,&dmfe_interrupt,SA_SHIRQ,dev->name,dev)) 		return -EAGAIN;	/* Initilize DM910X board */	dmfe_init_dm9000(dev); 	/* Init driver variable */	db->reset_counter 	= 0;	db->reset_tx_timeout 	= 0;	db->cont_rx_pkt_cnt	= 0;		/* check link state and media speed */	db->Speed =10;	i=0;	do {		reg_nsr = ior(db,0x1);		if(reg_nsr & 0x40) /* link OK!! */		{			/* wait for detected Speed */			mdelay(200);			reg_nsr = ior(db,0x1);			if(reg_nsr & 0x80)				db->Speed =10;			else				db->Speed =100;			break;		}		i++;		mdelay(1);	}while(i<3000);	/* wait 3 second  */	//printk("i=%d  Speed=%d\n",i,db->Speed);		/* set and active a timer process */	init_timer(&db->timer);	db->timer.expires 	= DMFE_TIMER_WUT * 2;	db->timer.data 		= (unsigned long)dev;	db->timer.function 	= &dmfe_timer;	add_timer(&db->timer);	//Move to DM9000 initiallization was finished. 		netif_start_queue(dev);	return 0;}/* Set PHY operationg mode*/static void set_PHY_mode(board_info_t *db){	u16 phy_reg0 = 0x1200;		/* Auto-negotiation & Restart Auto-negotiation */	u16 phy_reg4 = 0x01e1;		/* Default flow control disable*/	if ( !(db->op_mode & DM9KS_AUTO) ) // op_mode didn't auto sense */	{ 		switch(db->op_mode) {			case DM9KS_10MHD:  phy_reg4 = 0x21;                         	           phy_reg0 = 0x1000;					   break;			case DM9KS_10MFD:  phy_reg4 = 0x41; 					   phy_reg0 = 0x1100;                                	   break;			case DM9KS_100MHD: phy_reg4 = 0x81; 					   phy_reg0 = 0x3000;				    	   break;			case DM9KS_100MFD: phy_reg4 = 0x101; 					   phy_reg0 = 0x3100;				   	   break;			default: 					   break;		} // end of switch	} // end of if	phy_write(db, 0, phy_reg0);	phy_write(db, 4, phy_reg4);}/* 	Initilize dm9000 board*/static void dmfe_init_dm9000(struct net_device *dev){	board_info_t *db = (board_info_t *)dev->priv;	DMFE_DBUG(0, "dmfe_init_dm9000()", 0);	/* set the internal PHY power-on, GPIOs normal, and wait 2ms */	iow(db, DM9KS_GPR, 1); 	/* Power-Down PHY */	udelay(500);	iow(db, DM9KS_GPR, 0);	/* GPR (reg_1Fh)bit GPIO0=0 pre-activate PHY */	udelay(20);		/* wait 2ms for PHY power-on ready */	/* do a software reset and wait 20us */	iow(db, DM9KS_NCR, 3);	udelay(20);		/* wait 20us at least for software reset ok */	iow(db, DM9KS_NCR, 3);	/* NCR (reg_00h) bit[0] RST=1 & Loopback=1, reset on */	udelay(20);		/* wait 20us at least for software reset ok */	/* I/O mode */	db->io_mode = ior(db, DM9KS_ISR) >> 6; /* ISR bit7:6 keeps I/O mode */	/* Set PHY */	db->op_mode = media_mode;	set_PHY_mode(db);	/* Program operating register */	iow(db, DM9KS_NCR, 0);	iow(db, DM9KS_TCR, 0);		/* TX Polling clear */	iow(db, DM9KS_BPTR, 0x3f);	/* Less 3kb, 600us */	iow(db, DM9KS_SMCR, 0);		/* Special Mode */	iow(db, DM9KS_NSR, 0x2c);	/* clear TX status */	iow(db, DM9KS_ISR, 0x0f); 	/* Clear interrupt status */	/* Added by jackal at 03/29/2004 */#if defined(CHECKSUM)	iow(db, DM9KS_TCCR, 0x07);	/* TX UDP/TCP/IP checksum enable */	iow(db, DM9KS_RCSR, 0x02);	/*Receive checksum enable */#endif#if defined(ETRANS)	iow(db, DM9KS_ETXCSR, 0x83);#endif 	/* Set address filter table */	dm9000_hash_table(dev);	/* Activate DM9000A/DM9010 */	iow(db, DM9KS_RXCR, DM9KS_REG05 | 1);	/* RX enable */	iow(db, DM9KS_IMR, DM9KS_REGFF); 	// Enable TX/RX interrupt mask 	/* Init Driver variable */	db->tx_pkt_cnt 		= 0;			netif_carrier_on(dev);	spin_lock_init(&db->lock);}/*  Hardware start transmission.  Send a packet to media from the upper layer.*/static int dmfe_start_xmit(struct sk_buff *skb, struct net_device *dev){	board_info_t *db = (board_info_t *)dev->priv;	char * data_ptr;	int i, tmplen;	if(db->Speed == 10)		{if (db->tx_pkt_cnt >= 1) return 1;}	else		{if (db->tx_pkt_cnt >= 2) return 1;}		/* packet counting */	db->tx_pkt_cnt++;	db->stats.tx_packets++;	db->stats.tx_bytes+=skb->len;	if (db->Speed == 10)		{if (db->tx_pkt_cnt >= 1) netif_stop_queue(dev);}	else		{if (db->tx_pkt_cnt >= 2) netif_stop_queue(dev);}	/* Disable all interrupt */	iow(db, DM9KS_IMR, DM9KS_DISINTR);	/* Set TX length to reg. 0xfc & 0xfd */	iow(db, DM9KS_TXPLL, (skb->len & 0xff));	iow(db, DM9KS_TXPLH, (skb->len >> 8) & 0xff);	/* Move data to TX SRAM */	data_ptr = (char *)skb->data;		outb(DM9KS_MWCMD, db->io_addr); // Write data into SRAM trigger	switch(db->io_mode)	{		case DM9KS_BYTE_MODE:			for (i = 0; i < skb->len; i++)				outb((data_ptr[i] & 0xff), db->io_data);			break;		case DM9KS_WORD_MODE:			tmplen = (skb->len + 1) / 2;			for (i = 0; i < tmplen; i++)         			outw(((u16 *)data_ptr)[i], db->io_data);         		break;         	case DM9KS_DWORD_MODE:         		tmplen = (skb->len + 3) / 4;						for (i = 0; i< tmplen; i++)				outl(((u32 *)data_ptr)[i], db->io_data);			break;	}	#if !defined(ETRANS)	/* Issue TX polling command */	iow(db, DM9KS_TCR, 0x1); /* Cleared after TX complete*/#endif	/* Saved the time stamp */	dev->trans_start = jiffies;	db->cont_rx_pkt_cnt =0;	/* Free this SKB */	dev_kfree_skb(skb);	/* Re-enable interrupt */	iow(db, DM9KS_IMR, DM9KS_REGFF);	return 0;}/*  Stop the interface.  The interface is stopped when it is brought.*/static int dmfe_stop(struct net_device *dev){	board_info_t *db = (board_info_t *)dev->priv;	DMFE_DBUG(0, "dmfe_stop", 0);	/* deleted timer */	del_timer(&db->timer);