smc91111.c

ARM的bootloader代码.rar

 .-------------------------------------------------------------*/
static word smc_read_phy_register(byte phyreg)
{
	int oldBank;
	int i;
	byte mask;
	word mii_reg;
	byte bits[64];
	int clk_idx = 0;
	int input_idx;
	word phydata;
	byte phyaddr = SMC_PHY_ADDR;

	// 32 consecutive ones on MDO to establish sync
	for (i = 0; i < 32; ++i)
		bits[clk_idx++] = MII_MDOE | MII_MDO;

	// Start code <01>
	bits[clk_idx++] = MII_MDOE;
	bits[clk_idx++] = MII_MDOE | MII_MDO;

	// Read command <10>
	bits[clk_idx++] = MII_MDOE | MII_MDO;
	bits[clk_idx++] = MII_MDOE;

	// Output the PHY address, msb first
	mask = (byte)0x10;
	for (i = 0; i < 5; ++i)
		{
		if (phyaddr & mask)
			bits[clk_idx++] = MII_MDOE | MII_MDO;
		else
			bits[clk_idx++] = MII_MDOE;

		// Shift to next lowest bit
		mask >>= 1;
		}

	// Output the phy register number, msb first
	mask = (byte)0x10;
	for (i = 0; i < 5; ++i)
		{
		if (phyreg & mask)
			bits[clk_idx++] = MII_MDOE | MII_MDO;
		else
			bits[clk_idx++] = MII_MDOE;

		// Shift to next lowest bit
		mask >>= 1;
		}

	// Tristate and turnaround (2 bit times)
	bits[clk_idx++] = 0;
	//bits[clk_idx++] = 0;

	// Input starts at this bit time
	input_idx = clk_idx;

	// Will input 16 bits
	for (i = 0; i < 16; ++i)
		bits[clk_idx++] = 0;

	// Final clock bit
	bits[clk_idx++] = 0;

	// Save the current bank
	oldBank = SMC_inw( BANK_SELECT );

	// Select bank 3
	SMC_SELECT_BANK( 3 );

	// Get the current MII register value
	mii_reg = SMC_inw( MII_REG );

	// Turn off all MII Interface bits
	mii_reg &= ~(MII_MDOE|MII_MCLK|MII_MDI|MII_MDO);

	// Clock all 64 cycles
	for (i = 0; i < sizeof bits; ++i)
		{
		// Clock Low - output data
		SMC_outw( mii_reg | bits[i], MII_REG );
		udelay(SMC_PHY_CLOCK_DELAY);


		// Clock Hi - input data
		SMC_outw( mii_reg | bits[i] | MII_MCLK, MII_REG );
		udelay(SMC_PHY_CLOCK_DELAY);
		bits[i] |= SMC_inw( MII_REG ) & MII_MDI;
		}

	// Return to idle state
	// Set clock to low, data to low, and output tristated
	SMC_outw( mii_reg, MII_REG );
	udelay(SMC_PHY_CLOCK_DELAY);

	// Restore original bank select
	SMC_SELECT_BANK( oldBank );

	// Recover input data
	phydata = 0;
	for (i = 0; i < 16; ++i)
		{
		phydata <<= 1;

		if (bits[input_idx++] & MII_MDI)
			phydata |= 0x0001;
		}

#if (SMC_DEBUG > 2 )
	printf("smc_read_phy_register(): phyaddr=%x,phyreg=%x,phydata=%x\n",
		phyaddr, phyreg, phydata);
	smc_dump_mii_stream(bits, sizeof bits);
#endif

	return(phydata);	
}


/*------------------------------------------------------------
 . Writes a register to the MII Management serial interface
 .-------------------------------------------------------------*/
static void smc_write_phy_register(byte phyreg, word phydata)
{
	int oldBank;
	int i;
	word mask;
	word mii_reg;
	byte bits[65];
	int clk_idx = 0;
	byte phyaddr = SMC_PHY_ADDR;

	// 32 consecutive ones on MDO to establish sync
	for (i = 0; i < 32; ++i)
		bits[clk_idx++] = MII_MDOE | MII_MDO;

	// Start code <01>
	bits[clk_idx++] = MII_MDOE;
	bits[clk_idx++] = MII_MDOE | MII_MDO;

	// Write command <01>
	bits[clk_idx++] = MII_MDOE;
	bits[clk_idx++] = MII_MDOE | MII_MDO;

	// Output the PHY address, msb first
	mask = (byte)0x10;
	for (i = 0; i < 5; ++i)
		{
		if (phyaddr & mask)
			bits[clk_idx++] = MII_MDOE | MII_MDO;
		else
			bits[clk_idx++] = MII_MDOE;

		// Shift to next lowest bit
		mask >>= 1;
		}

	// Output the phy register number, msb first
	mask = (byte)0x10;
	for (i = 0; i < 5; ++i)
		{
		if (phyreg & mask)
			bits[clk_idx++] = MII_MDOE | MII_MDO;
		else
			bits[clk_idx++] = MII_MDOE;

		// Shift to next lowest bit
		mask >>= 1;
		}

	// Tristate and turnaround (2 bit times)
	bits[clk_idx++] = 0;
	bits[clk_idx++] = 0;

	// Write out 16 bits of data, msb first
	mask = 0x8000;
	for (i = 0; i < 16; ++i)
		{
		if (phydata & mask)
			bits[clk_idx++] = MII_MDOE | MII_MDO;
		else
			bits[clk_idx++] = MII_MDOE;

		// Shift to next lowest bit
		mask >>= 1;
		}

	// Final clock bit (tristate)
	bits[clk_idx++] = 0;

	// Save the current bank
	oldBank = SMC_inw( BANK_SELECT );

	// Select bank 3
	SMC_SELECT_BANK( 3 );

	// Get the current MII register value
	mii_reg = SMC_inw( MII_REG );

	// Turn off all MII Interface bits
	mii_reg &= ~(MII_MDOE|MII_MCLK|MII_MDI|MII_MDO);

	// Clock all cycles
	for (i = 0; i < sizeof bits; ++i)
		{
		// Clock Low - output data
		SMC_outw( mii_reg | bits[i], MII_REG );
		udelay(SMC_PHY_CLOCK_DELAY);


		// Clock Hi - input data
		SMC_outw( mii_reg | bits[i] | MII_MCLK, MII_REG );
		udelay(SMC_PHY_CLOCK_DELAY);
		bits[i] |= SMC_inw( MII_REG ) & MII_MDI;
		}

	// Return to idle state
	// Set clock to low, data to low, and output tristated
	SMC_outw( mii_reg, MII_REG );
	udelay(SMC_PHY_CLOCK_DELAY);

	// Restore original bank select
	SMC_SELECT_BANK( oldBank );

#if (SMC_DEBUG > 2 )
	printf("smc_write_phy_register(): phyaddr=%x,phyreg=%x,phydata=%x\n",
		phyaddr, phyreg, phydata);
	smc_dump_mii_stream(bits, sizeof bits);
#endif
}



/*------------------------------------------------------------
 . Waits the specified number of milliseconds - kernel friendly
 .-------------------------------------------------------------*/
static void smc_wait_ms(unsigned int ms)
{
	udelay(ms*100000);
}



/*------------------------------------------------------------
 . Configures the specified PHY using Autonegotiation. Calls
 . smc_phy_fixed() if the user has requested a certain config.
 .-------------------------------------------------------------*/
static void smc_phy_configure()
{
	int timeout;
	byte phyaddr;
	word my_phy_caps; // My PHY capabilities
	word my_ad_caps;  // My Advertised capabilities
	word status = 0;  //;my status = 0
	int failed = 0;

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



	// Get the detected phy address
	phyaddr = SMC_PHY_ADDR;

	// Reset the PHY, setting all other bits to zero
	smc_write_phy_register(PHY_CNTL_REG, PHY_CNTL_RST);

	// Wait for the reset to complete, or time out
	timeout = 6; // Wait up to 3 seconds
	while (timeout--)
		{
		if (!(smc_read_phy_register(PHY_CNTL_REG)
		    & PHY_CNTL_RST))
			{
			// reset complete
			break;
			}

		smc_wait_ms(500); // wait 500 millisecs
		}

	if (timeout < 1)
		{
		printf("%s:PHY reset timed out\n", SMC_DEV_NAME);
		goto smc_phy_configure_exit;
		}

	// Read PHY Register 18, Status Output
	// lp->lastPhy18 = smc_read_phy_register(PHY_INT_REG);

	// Enable PHY Interrupts (for register 18)
	// Interrupts listed here are disabled
	smc_write_phy_register(PHY_INT_REG, 0xffff);

	/* Configure the Receive/Phy Control register */
	SMC_SELECT_BANK( 0 );
	SMC_outw( RPC_DEFAULT, RPC_REG );

	// Copy our capabilities from PHY_STAT_REG to PHY_AD_REG
	my_phy_caps = smc_read_phy_register(PHY_STAT_REG);
	my_ad_caps  = PHY_AD_CSMA; // I am CSMA capable

	if (my_phy_caps & PHY_STAT_CAP_T4)
		my_ad_caps |= PHY_AD_T4;

	if (my_phy_caps & PHY_STAT_CAP_TXF)
		my_ad_caps |= PHY_AD_TX_FDX;

	if (my_phy_caps & PHY_STAT_CAP_TXH)
		my_ad_caps |= PHY_AD_TX_HDX;

	if (my_phy_caps & PHY_STAT_CAP_TF)
		my_ad_caps |= PHY_AD_10_FDX;

	if (my_phy_caps & PHY_STAT_CAP_TH)
		my_ad_caps |= PHY_AD_10_HDX;

	// Update our Auto-Neg Advertisement Register
	smc_write_phy_register( PHY_AD_REG, my_ad_caps);

	PRINTK2("%s:phy caps=%x\n", SMC_DEV_NAME, my_phy_caps);
	PRINTK2("%s:phy advertised caps=%x\n", SMC_DEV_NAME, my_ad_caps);

	// Restart auto-negotiation process in order to advertise my caps
	smc_write_phy_register( PHY_CNTL_REG,
		PHY_CNTL_ANEG_EN | PHY_CNTL_ANEG_RST );

	// Wait for the auto-negotiation to complete.  This may take from
	// 2 to 3 seconds.
	// Wait for the reset to complete, or time out
	timeout = 20; // Wait up to 10 seconds
	while (timeout--)
		{
		status = smc_read_phy_register( PHY_STAT_REG);
		if (status & PHY_STAT_ANEG_ACK)
			{
			// auto-negotiate complete
			break;
			}

		smc_wait_ms(500); // wait 500 millisecs

		// Restart auto-negotiation if remote fault
		if (status & PHY_STAT_REM_FLT)
			{
			printf("%s:PHY remote fault detected\n", SMC_DEV_NAME);

			// Restart auto-negotiation
			printf("%s:PHY restarting auto-negotiation\n",
				SMC_DEV_NAME);
			smc_write_phy_register( PHY_CNTL_REG,
				PHY_CNTL_ANEG_EN | PHY_CNTL_ANEG_RST |
				PHY_CNTL_SPEED | PHY_CNTL_DPLX);
			}
		}

	if (timeout < 1)
		{
		printf("%s:PHY auto-negotiate timed out\n",
			SMC_DEV_NAME);
		printf("%s:PHY auto-negotiate timed out\n", SMC_DEV_NAME);
		failed = 1;
		}

	// Fail if we detected an auto-negotiate remote fault
	if (status & PHY_STAT_REM_FLT)
		{
		printf( "%s:PHY remote fault detected\n", SMC_DEV_NAME);
		printf("%s:PHY remote fault detected\n", SMC_DEV_NAME);
		failed = 1;
		}

	// Re-Configure the Receive/Phy Control register
	SMC_outw( RPC_DEFAULT, RPC_REG );

  smc_phy_configure_exit:

}


#if SMC_DEBUG > 2
static void print_packet( byte * buf, int length )
{
#if 0
        int i;
        int remainder;
        int lines;

        printf("Packet of length %d \n", length );

#if SMC_DEBUG > 3
        lines = length / 16;
        remainder = length % 16;

        for ( i = 0; i < lines ; i ++ ) {
                int cur;

                for ( cur = 0; cur < 8; cur ++ ) {
                        byte a, b;

                        a = *(buf ++ );
                        b = *(buf ++ );
                        printf("%02x%02x ", a, b );
                }
                printf("\n");
        }
        for ( i = 0; i < remainder/2 ; i++ ) {
                byte a, b;

                a = *(buf ++ );
                b = *(buf ++ );
                printf("%02x%02x ", a, b );
        }
        printf("\n");
#endif
#endif
}
#endif

int eth_init(bd_t *bd) {
	smc_open();
	return 0;
}

void eth_halt() {
	smc_close();
}

int eth_rx() {
	return smc_rcv();
}

int eth_send(volatile void *packet, int length) {
	return smc_send_packet(packet, length);
}

#endif /* CONFIG_DRIVER_SMC91111 */