smc91113.c

10/100M以太网驱动源代码

/*------------------------------------------------------------------------
 . smc91113.c
 . This is a driver for SMSC's 91C113 single-chip Ethernet device.
 . "Features" of the SMC chip:
 .   Integrated PHY/MAC for 10/100BaseT Operation
 .   Supports internal and external MII
 .   Integrated 8K packet memory
 .   EEPROM interface for configuration
 .
 . Arguments:
 . 	io	= for the base address
 .	irq	= for the IRQ
 .
 . Hardware multicast code from Peter Cammaert ( [e-mail] )
 .
 . Sources:
 .    o   SMSC LAN91C111 databook (www.smsc.com)
 .    o   smc9194.c by Erik Stahlman
 .    o   skeleton.c by Donald Becker ( [e-mail] )
 .
 ----------------------------------------------------------------------------*/

//#include "armboot.h"
//#include "command.h"
#include "..\inc\smc91113.h"
#include "..\inc\ethernet.h"
#include "..\inc\mac.h"
//#include "net.h"

//#ifdef CONFIG_DRIVER_SMC91113   //xu

// Use power-down feature of the chip
#define POWER_DOWN	0

#define NO_AUTOPROBE

static const char version[] =
	" EV44B0II ethernet driver v1.0 2003/01/08 by Qinwei, MICETEK Shanghai\n";

#define SMC_DEBUG 0

/*------------------------------------------------------------------------
 .
 . Configuration options, for the experienced user to change.
 .
 -------------------------------------------------------------------------*/

/*
 . Wait time for memory to be free.  This probably shouldn't be
 . tuned that much, as waiting for this means nothing else happens
 . in the system
*/
#define MEMORY_WAIT_TIME 16


#if (SMC_DEBUG > 2 )
//#define PRINTK3(args...) printf(args)
#else
//#define PRINTK3(args...)
#endif

#if SMC_DEBUG > 1
//#define PRINTK2(args...) printf(args)
#else
//#define PRINTK2(args...)
#endif

#ifdef SMC_DEBUG
//#define PRINTK(args...) printf(args)
#else
//#define PRINTK(args...)
#endif


/*------------------------------------------------------------------------
 .
 . The internal workings of the driver.  If you are changing anything
 . here with the SMC stuff, you should have the datasheet and know
 . what you are doing.
 .
 -------------------------------------------------------------------------*/
#define CARDNAME "LAN91C113"

// Memory sizing constant
#define LAN91C113_MEMORY_MULTIPLIER	(1024*2)

#ifndef CONFIG_SMC91113_BASE
#define CONFIG_SMC91113_BASE 0x2000300
#endif

#define SMC_BASE_ADDRESS CONFIG_SMC91113_BASE 

#define SMC_DEV_NAME "SMC91113"
#define SMC_PHY_ADDR 0x0000
#define SMC_ALLOC_MAX_TRY 5
//#define SMC_TX_TIMEOUT 30   //del by xu
#define SMC_TX_TIMEOUT 50             // 原来是5；

#define SMC_PHY_CLOCK_DELAY 1000

#define ETH_ZLEN 60

#ifdef  CONFIG_SMC_USE_32_BIT
#define USE_32_BIT  
#else
#undef USE_32_BIT 
#endif
#define MAX_LENGTH 1024

/*-----------------------------------------------------------------
 .
 .  The driver can be entered at any of the following entry points.
 .
 .------------------------------------------------------------------  */

extern int eth_init(void);
extern void eth_halt(void);
extern int eth_rx(void);
int smc_send_packet(volatile void *packet, int packet_length);
//extern int eth_send(volatile void *packet, int length);  //xu


/*
 . This is called by  register_netdev().  It is responsible for
 . checking the portlist for the SMC9000 series chipset.  If it finds
 . one, then it will initialize the device, find the hardware information,
 . and sets up the appropriate device parameters.
 . NOTE: Interrupts are *OFF* when this procedure is called.
 .
 . NB:This shouldn't be static since it is referred to externally.
*/
int smc_init(void);

/*
 . This is called by  unregister_netdev().  It is responsible for
 . cleaning up before the driver is finally unregistered and discarded.
*/
void smc_destructor(void);

/*
 . The kernel calls this function when someone wants to use the device,
 . typically 'ifconfig ethX up'.
*/
static int smc_open(void);


/*
 . This is called by the kernel in response to 'ifconfig ethX down'.  It
 . is responsible for cleaning up everything that the open routine
 . does, and maybe putting the card into a powerdown state.
*/
static int smc_close(void);

/*
 . Configures the PHY through the MII Management interface
*/
static void smc_phy_configure(void);

/*
 . This is a separate procedure to handle the receipt of a packet, to
 . leave the interrupt code looking slightly cleaner
*/
int smc_rcv(void);



/*
 ------------------------------------------------------------
 .
 . Internal routines
 .
 ------------------------------------------------------------
*/

//static char smc_mac_addr[] = {0x02, 0x80, 0xad, 0x20, 0x31, 0xb8}; 

/*
 * This function must be called before smc_open() if you want to override
 * the default mac address.
 */

void smc_set_mac_addr(const char *addr) {
	int i;

	for (i=0; i < sizeof(smc_mac_addr); i++){
	    smc_mac_addr[i] = addr[i];
	}
}
/*
 * smc_get_macaddr is no longer used. If you want to override the default
 * mac address, call smc_get_mac_addr as a part of the board initialisation.
 */

#if 0
void smc_get_macaddr( byte *addr ) {
	/* MAC ADDRESS AT FLASHBLOCK 1 / OFFSET 0x10 */
        unsigned char *dnp1110_mac = (unsigned char *) (0xE8000000 + 0x20010);
	int i;


        for (i=0; i<6; i++) {
            addr[0] = *(dnp1110_mac+0);
            addr[1] = *(dnp1110_mac+1);
            addr[2] = *(dnp1110_mac+2);
            addr[3] = *(dnp1110_mac+3);
            addr[4] = *(dnp1110_mac+4);
            addr[5] = *(dnp1110_mac+5);
        }
}
#endif

/***********************************************
 * Show available memory                       *
 ***********************************************/
void dump_memory_info(void)
{
        word mem_info;
        word old_bank;

        old_bank = SMC_inw(BANK_SELECT)&0xF;

        SMC_SELECT_BANK(0);
        mem_info = SMC_inw( MIR_REG );
//        PRINTK2("Memory: %4d available\n", (mem_info >> 8)*2048);

        SMC_SELECT_BANK(old_bank);
}
/*
 . A rather simple routine to print out a packet for debugging purposes.
*/
#if SMC_DEBUG > 2
static void print_packet( byte *, int );
#endif

#define tx_done(dev) 1



/* this does a soft reset on the device */
static void smc_reset( void );

/* Enable Interrupts, Receive, and Transmit */
static void smc_enable( void );

/* this puts the device in an inactive state */
static void smc_shutdown( void );

/* Routines to Read and Write the PHY Registers across the
   MII Management Interface
*/

static word smc_read_phy_register(byte phyreg);
static void smc_write_phy_register(byte phyreg, word phydata);


static int poll4int( byte mask, int timeout ) {      //mask=IM_TX_INT.
//  int CFG_HZ;                                      //add by xu
    
//    int tmo = get_timer(0) + timeout * CFG_HZ;     //xu  要先测试延迟时间在给参数;
//    int is_timeout = 0;
      int is_timeout;
    word old_bank = SMC_inw(BSR_REG);

//    PRINTK2("Polling...\n");
    SMC_SELECT_BANK(2);
    while((SMC_inw(INT_REG) & mask) == 0) 
    {  
    	is_timeout=is_timeout-1;
        if (is_timeout <= 1)   //xu
        {    
//	  is_timeout = 1;
          break;
    	}
    }

    /* restore old bank selection */
    SMC_SELECT_BANK(old_bank);

    if (is_timeout)
	return 1;
    else
	return 0;
}

/*
 . Function: smc_reset( void )
 . Purpose:
 .  	This sets the SMC91113 chip to its normal state, hopefully from whatever
 . 	mess that any other DOS driver has put it in.
 .
 . Maybe I should reset more registers to defaults in here?  SOFTRST  should
 . do that for me.
 .
 . Method:
 .	1.  send a SOFT RESET
 .	2.  wait for it to finish
 .	3.  enable autorelease mode
 .	4.  reset the memory management unit
 .	5.  clear all interrupts
 .
*/
static void smc_reset( void )
{
    short temp = 0;
//	PRINTK2("%s:smc_reset\n", SMC_DEV_NAME);

	/* This resets the registers mostly to defaults, but doesn't
	   affect EEPROM.  That seems unnecessary 本程序不用EEPROM */
	SMC_SELECT_BANK( 0 );
	SMC_outw( RCR_SOFTRST, RCR_REG );                   //Soft reset. set 1 start,and clear 0 stop.
    while(1)
    {
        temp ++;
        if ((SMC_inw(RCR_REG ) & RCR_SOFTRST) == 0)
            break;
        udelay (10000); /* Delay 10ms, try 5 times*/
        if (temp >=5)
        {
            SMC_outw( (SMC_inw(RCR_REG ) & (~RCR_SOFTRST)) , RCR_REG );  //stop reset.
            break;
        }
    }
	/* Setup the Configuration Register */
	/* This is necessary because the CONFIG_REG is not affected by a soft reset*/

	SMC_SELECT_BANK( 1 );
#if defined(CONFIG_SMC91113_EXT_PHY)
	SMC_outw( CONFIG_DEFAULT | CONFIG_EXT_PHY, CONFIG_REG);     //这里不用外部
#else
	SMC_outw( CONFIG_DEFAULT, CONFIG_REG);                      //设置为默认值；
#endif


	/* Release from possible power-down state */
	/* Configuration register is not affected by Soft Reset */
	SMC_outw( SMC_inw( CONFIG_REG ) | CONFIG_EPH_POWER_EN, CONFIG_REG  );

	SMC_SELECT_BANK( 0 );

	/* this should pause enough for the chip to be happy */
	udelay(5);

	/* Disable transmit and receive functionality */
	SMC_outw( RCR_CLEAR, RCR_REG );
	udelay(5);                           //add by xu.
	SMC_outw( TCR_CLEAR, TCR_REG );
	udelay(5);                           //add by xu.
		
	/* set the control register */
	SMC_SELECT_BANK( 1 );
	udelay(5);                           //add by xu.
	SMC_outw( CTL_DEFAULT, CTL_REG );
	udelay(5);                           //add by xu.

	/* Reset the MMU */
	SMC_SELECT_BANK( 2 );
	udelay(5);                           //add by xu.
	SMC_outw( MC_RESET, MMU_CMD_REG );
	while ( SMC_inw( MMU_CMD_REG ) & MC_BUSY )
		udelay(5); // Wait until not busy

	/* Note:  It doesn't seem that waiting for the MMU busy is needed here,
	   but this is a place where future chipsets _COULD_ break.  Be wary
 	   of issuing another MMU command right after this */

	/* Disable all interrupts */
	SMC_outb( 0, IM_REG );
}

/*
 . Function: smc_enable
 . Purpose: let the chip talk to the outside work
 . Method:
 .	1.  Enable the transmitter
 .	2.  Enable the receiver
 .	3.  Enable interrupts
*/
static void smc_enable()
{  
    unsigned short i,j;
    unsigned char k;
//	PRINTK2("%s:smc_enable\n", SMC_DEV_NAME);
	SMC_SELECT_BANK( 0 );
	/* see the header file for options in TCR/RCR DEFAULT*/
//    SMC_outw( TCR_DEFAULT, TCR_REG );         //xu 好像PAD 不成功;
	SMC_outw(0X81,TCR_REG);
    udelay(5);
//  i=SMC_inw( TCR_REG);
    udelay(5);
//    SMC_outw( RCR_DEFAULT, RCR_REG );         //strip CRC and enable RX.and rx all multicast.
	SMC_outw(0X304,RCR_REG);
	udelay(5);
//	j=SMC_inw( RCR_REG );
	SMC_SELECT_BANK( 2 );
	udelay(5);
	SMC_outb( 0x00, IM_REG );                  //enable rx interrupt. add by xu.
	udelay(5);
//	k=SMC_inb( IM_REG );
	udelay(5);
	/* clear MII_DIS */
//	smc_write_phy_register(PHY_CNTL_REG, 0x0000);
}

/*
 . Function: smc_shutdown
 . Purpose:  closes down the SMC91xxx chip.
 . Method:
 .	1. zero the interrupt mask
 .	2. clear the enable receive flag
 .	3. clear the enable xmit flags
 .
 . TODO:
 .   (1) maybe utilize power down mode.
 .	Why not yet?  Because while the chip will go into power down mode,
 .	the manual says that it will wake up in response to any I/O requests
 .	in the register space.   Empirical results do not show this working.
*/
static void smc_shutdown()
{
//	PRINTK2(CARDNAME ":smc_shutdown\n");

	/* no more interrupts for me */
	SMC_SELECT_BANK( 2 );
	SMC_outb( 0, IM_REG );

	/* and tell the card to stay away from that nasty outside world */
	SMC_SELECT_BANK( 0 );
	SMC_outb( RCR_CLEAR, RCR_REG );
	SMC_outb( TCR_CLEAR, TCR_REG );
}


/*
 . Function:  smc_hardware_send_packet(struct net_device * )
 . Purpose:
 .	This sends the actual packet to the SMC9xxx chip.
 .
 . Algorithm:
 . 	First, see if a saved_skb is available.
 .		( this should NOT be called if there is no 'saved_skb'
 .	Now, find the packet number that the chip allocated
 .	Point the data pointers at it in memory
 .	Set the length word in the chip's memory
 .	Dump the packet to chip memory
 .	Check if a last byte is needed ( odd length packet )
 .		if so, set the control flag right
 . 	Tell the card to send it
 .	Enable the transmit interrupt, so I know if it failed
 . 	Free the kernel data if I actually sent it.
*/
int smc_send_packet(volatile void *packet, int packet_length)  //static is del by xu.
//int smc_send_packet(volatile unsigned char *packet, int packet_length)
{
	byte	 		packet_no;          //packet number
	unsigned long		ioaddr;         //io address
	byte			* buf;   //del by xu
//	unsigned short *buf;
	int			length;
	int         length16;
	int			numPages;
	int			try = 0;
	int			time_out;
	byte		status;
	unsigned char temp0;
	unsigned short temp1;
	

//	PRINTK3("%s:smc_hardware_send_packet\n", SMC_DEV_NAME);

	length = ETH_ZLEN < packet_length ? packet_length : ETH_ZLEN;  //ETH_ZLEN = 60 min frame size.
	
	/* allocate memory
	** The MMU wants the number of pages to be the number of 256 bytes
	** 'pages', minus 1 ( since a packet can't ever have 0 pages :) )
	**
	** The 91C111 ignores the size bits, but the code is left intact
	** for backwards and future compatibility.
	**
	** Pkt size for allocating is data length +6 (for additional status
	** words, length and ctl!)
	**
	** If odd size then last byte is included in this header.
	*/
	numPages =   ((length & 0xfffe) + 6);           //得到的是发送缓冲区需要的字节数；
	numPages >>= 8; // Divide by 256

	if (numPages > 7 ) {
//		printf("%s: Far too big packet error. \n", SMC_DEV_NAME);  //要发送的报太长;
		return 0;
	}

	/* now, try to allocate the memory */
	SMC_SELECT_BANK( 2 );
	SMC_outw( MC_ALLOC | numPages, MMU_CMD_REG );     //SMC_outw(d,r); numPages写入保留区，没用？！

again:
	try++;
	time_out = MEMORY_WAIT_TIME;                      //=16.
	do {
		status = SMC_inb( INT_REG );
		if ( status & IM_ALLOC_INT ) {
			/* acknowledge the interrupt */
			SMC_outb( IM_ALLOC_INT, INT_REG );        //not defined.
  			break;
		}
   	} while ( -- time_out );

   	if ( !time_out ) {
//			PRINTK2("%s: memory allocation, try %d failed ...\n",
//				SMC_DEV_NAME, try);
			if (try < SMC_ALLOC_MAX_TRY)              //SMC_ALLOC_MAX_TRY=5.
				goto again;
			else
				return 0;		
	}
	
//	PRINTK2("%s: memory allocation, try %d succeeded ...\n",
//		SMC_DEV_NAME,
//		try);

	/* I can send the packet now.. */

	ioaddr = SMC_BASE_ADDRESS;

	buf = (byte *)packet;  //del bu xu.

	/* If I get here, I _know_ there is a packet slot waiting for me */
	packet_no = SMC_inb( AR_REG );                   //allocation result.
	if ( packet_no & AR_FAILED ) {
		/* or isn't there?  BAD CHIP! */
//		printf("%s: Memory allocation failed. \n",
//			SMC_DEV_NAME);
		return 0;
	}

	/* we have a packet address, so tell the card to use it */
	SMC_outb( packet_no, PN_REG );                  //packet no.

	/* point to the beginning of the packet */