smc91111.c

ARM的bootloader代码.rar

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

	length = ETH_ZLEN < packet_length ? packet_length : ETH_ZLEN;
	
	/* 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);
	numPages >>= 8; // Divide by 256

	if (numPages > 7 ) {
		printf("%s: Far too big packet error. \n", SMC_DEV_NAME);
		return 0;
	}

	/* now, try to allocate the memory */
	SMC_SELECT_BANK( 2 );
	SMC_outw( MC_ALLOC | numPages, MMU_CMD_REG );

again:
	try++;
	time_out = MEMORY_WAIT_TIME;
	do {
		status = SMC_inb( INT_REG );
		if ( status & IM_ALLOC_INT ) {
			/* acknowledge the interrupt */
			SMC_outb( IM_ALLOC_INT, INT_REG );
  			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)
				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;

	/* If I get here, I _know_ there is a packet slot waiting for me */
	packet_no = SMC_inb( AR_REG );
	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 );

	/* point to the beginning of the packet */
	SMC_outw( PTR_AUTOINC , PTR_REG );

   	PRINTK3("%s: Trying to xmit packet of length %x\n",
		SMC_DEV_NAME, length);

#if SMC_DEBUG > 2
	printf("Transmitting Packet\n");
	print_packet( buf, length );
#endif

	/* send the packet length ( +6 for status, length and ctl byte )
 	   and the status word ( set to zeros ) */
#ifdef USE_32_BIT
	SMC_outl(  (length +6 ) << 16 , DATA_REG );
#else
	SMC_outw( 0, DATA_REG );
	/* send the packet length ( +6 for status words, length, and ctl*/
	SMC_outw( (length+6), DATA_REG );
#endif

	/* send the actual data
	 . I _think_ it's faster to send the longs first, and then
	 . mop up by sending the last word.  It depends heavily
 	 . on alignment, at least on the 486.  Maybe it would be
 	 . a good idea to check which is optimal?  But that could take
	 . almost as much time as is saved?
	*/
#ifdef USE_32_BIT
	outsl(ioaddr + DATA_REG, buf,  length >> 2 );
	if ( length & 0x2  )
		SMC_outw(*((word *)(buf + (length & 0xFFFFFFFC))),DATA_REG);
#else
	SMC_outsw(DATA_REG , buf, (length ) >> 1);
#endif // USE_32_BIT

	/* Send the last byte, if there is one.   */
	if ( (length & 1) == 0 ) {
		SMC_outw( 0, DATA_REG );
	} else {
		SMC_outw( buf[length -1 ] | 0x2000, DATA_REG );
	}

	/* and let the chipset deal with it */
	SMC_outw( MC_ENQUEUE , MMU_CMD_REG );

	/* poll for TX INT */
	if (poll4int(IM_TX_INT, SMC_TX_TIMEOUT)) {
		/* sending failed */
		PRINTK2("%s: TX timeout, sending failed...\n",
			SMC_DEV_NAME);

		/* release packet */
	        SMC_outw(MC_FREEPKT, MMU_CMD_REG);
        
        	/* wait for MMU getting ready (low) */
	        while (SMC_inw(MMU_CMD_REG) & MC_BUSY)
        	{
                	udelay(10);
	        }

        	PRINTK2("MMU ready\n");


		return 0;
	} else {
		/* ack. int */
		SMC_outw(IM_TX_INT, INT_REG);
		PRINTK2("%s: Sent packet of length %d \n", SMC_DEV_NAME, length);

		/* release packet */
	        SMC_outw(MC_FREEPKT, MMU_CMD_REG);
        
        	/* wait for MMU getting ready (low) */
	        while (SMC_inw(MMU_CMD_REG) & MC_BUSY)
        	{
                	udelay(10);
	        }

        	PRINTK2("MMU ready\n");


	}

	return length;
}

/*-------------------------------------------------------------------------
 |
 | smc_destructor( struct net_device * dev )
 |   Input parameters:
 |	dev, pointer to the device structure
 |
 |   Output:
 |	None.
 |
 ---------------------------------------------------------------------------
*/
void smc_destructor()
{
	PRINTK2(CARDNAME ":smc_destructor\n");
}


/*
 * Open and Initialize the board
 *
 * Set up everything, reset the card, etc ..
 *
 */
static int smc_open()
{
	int	i;	/* used to set hw ethernet address */


	PRINTK2("%s:smc_open\n", SMC_DEV_NAME);

	/* reset the hardware */

	smc_reset();
	smc_enable();

	/* Configure the PHY */
	smc_phy_configure();

	/* conservative setting (10Mbps, HalfDuplex, no AutoNeg.) */
//	SMC_SELECT_BANK(0);
//	SMC_outw(0, RPC_REG);

	/*
  		According to Becker, I have to set the hardware address
		at this point, because the (l)user can set it with an
		ioctl.  Easily done...
	*/
	SMC_SELECT_BANK( 1 );
	for ( i = 0; i < 6; i ++ )
		SMC_outb( smc_mac_addr[i], ADDR0_REG + i );

	return 0;
}


/*-------------------------------------------------------------
 .
 . smc_rcv -  receive a packet from the card
 .
 . There is ( at least ) a packet waiting to be read from
 . chip-memory.
 .
 . o Read the status
 . o If an error, record it
 . o otherwise, read in the packet
 --------------------------------------------------------------
*/
static int smc_rcv()
{
	int 	packet_number;
	word	status;
	word	packet_length;
	int     is_error = 0;


	SMC_SELECT_BANK(2);
	packet_number = SMC_inw( RXFIFO_REG );

	if ( packet_number & RXFIFO_REMPTY ) {

		return 0;
	}

	PRINTK3("%s:smc_rcv\n", SMC_DEV_NAME);
	/*  start reading from the start of the packet */
	SMC_outw( PTR_READ | PTR_RCV | PTR_AUTOINC, PTR_REG );

	/* First two words are status and packet_length */
	status 		= SMC_inw( DATA_REG );
	packet_length 	= SMC_inw( DATA_REG );

	packet_length &= 0x07ff;  /* mask off top bits */

	PRINTK2("RCV: STATUS %4x LENGTH %4x\n", status, packet_length );

	if ( !(status & RS_ERRORS ) ){
		/* Adjust for having already read the first two words */
		packet_length -= 4;



		// set odd length for bug in LAN91C111,
		// which never sets RS_ODDFRAME
		/* TODO ? */


#ifdef USE_32_BIT
		PRINTK3(" Reading %d dwords (and %d bytes) \n",
			packet_length >> 2, packet_length & 3 );
		/* QUESTION:  Like in the TX routine, do I want
		   to send the DWORDs or the bytes first, or some
		   mixture.  A mixture might improve already slow PIO
		   performance  */
		SMC_insl( DATA_REG , NetRxPackets, packet_length >> 2 );
		/* read the left over bytes */
		SMC_insb(  DATA_REG, NetRxPackets + (packet_length & 0xFFFFFC),
			packet_length & 0x3  );
#else
		PRINTK3(" Reading %d words and %d byte(s) \n",
			(packet_length >> 1 ), packet_length & 1 );
		SMC_insw(DATA_REG , NetRxPackets[0], packet_length >> 1);

#endif // USE_32_BIT

#if	SMC_DEBUG > 2
		printf("Receiving Packet\n");
		print_packet( NetRxPackets[0], packet_length );
#endif
	} else {
		/* error ... */
		/* TODO ? */
		is_error = 1;
	}

	while ( SMC_inw( MMU_CMD_REG ) & MC_BUSY )
		udelay(1); // Wait until not busy

	/*  error or good, tell the card to get rid of this packet */
	SMC_outw( MC_RELEASE, MMU_CMD_REG );
	
	while ( SMC_inw( MMU_CMD_REG ) & MC_BUSY )
		udelay(1); // Wait until not busy

	if (!is_error) {
		/* Pass the packet up to the protocol layers. */
		NetReceive(NetRxPackets[0], packet_length);
		return packet_length;
	} else {
		return 0;
	}

}



/*----------------------------------------------------
 . smc_close
 .
 . 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 smc_close()
{
	PRINTK2("%s:smc_close\n", SMC_DEV_NAME);

	/* clear everything */
	smc_shutdown();

	return 0;
}


#if 0
/*------------------------------------------------------------
 . Modify a bit in the LAN91C111 register set
 .-------------------------------------------------------------*/
static word smc_modify_regbit(int bank, int ioaddr, int reg,
	unsigned int bit, int val)
{
	word regval;

	SMC_SELECT_BANK( bank );

	regval = SMC_inw( reg );
	if (val)
		regval |= bit;
	else
		regval &= ~bit;

	SMC_outw( regval, 0 );
	return(regval);
}


/*------------------------------------------------------------
 . Retrieve a bit in the LAN91C111 register set
 .-------------------------------------------------------------*/
static int smc_get_regbit(int bank, int ioaddr, int reg, unsigned int bit)
{
	SMC_SELECT_BANK( bank );
	if ( SMC_inw( reg ) & bit)
		return(1);
	else
		return(0);
}


/*------------------------------------------------------------
 . Modify a LAN91C111 register (word access only)
 .-------------------------------------------------------------*/
static void smc_modify_reg(int bank, int ioaddr, int reg, word val)
{
	SMC_SELECT_BANK( bank );
	SMC_outw( val, reg );
}


/*------------------------------------------------------------
 . Retrieve a LAN91C111 register (word access only)
 .-------------------------------------------------------------*/
static int smc_get_reg(int bank, int ioaddr, int reg)
{
	SMC_SELECT_BANK( bank );
	return(SMC_inw( reg ));
}

#endif /* 0 */

//---PHY CONTROL AND CONFIGURATION-----------------------------------------

#if (SMC_DEBUG > 2 )

/*------------------------------------------------------------
 . Debugging function for viewing MII Management serial bitstream
 .-------------------------------------------------------------*/
static void smc_dump_mii_stream(byte* bits, int size)
{
	int i;

	printf("BIT#:");
	for (i = 0; i < size; ++i)
		{
		printf("%d", i%10);
		}

	printf("\nMDOE:");
	for (i = 0; i < size; ++i)
		{
		if (bits[i] & MII_MDOE)
			printf("1");
		else
			printf("0");
		}

	printf("\nMDO :");
	for (i = 0; i < size; ++i)
		{
		if (bits[i] & MII_MDO)
			printf("1");
		else
			printf("0");
		}

	printf("\nMDI :");
	for (i = 0; i < size; ++i)
		{
		if (bits[i] & MII_MDI)
			printf("1");
		else
			printf("0");
		}

	printf("\n");
}
#endif

/*------------------------------------------------------------
 . Reads a register from the MII Management serial interface