sis900.c

linux下从网卡远程启动

    nic->transmit = sis900_transmit;

    return 1;
}


/* 
 * EEPROM Routines:  These functions read and write to EEPROM for 
 *    retrieving the MAC address and other configuration information about 
 *    the card.
 */

/* Delay between EEPROM clock transitions. */
#define eeprom_delay()  inl(ee_addr)


/* Function: sis900_read_eeprom
 *
 * Description: reads and returns a given location from EEPROM
 *
 * Arguments: int location:       requested EEPROM location
 *
 * Returns:   u16:                contents of requested EEPROM location
 *
 */

/* Read Serial EEPROM through EEPROM Access Register, Note that location is 
   in word (16 bits) unit */
static u16 sis900_read_eeprom(int location)
{
    int i;
    u16 retval = 0;
    long ee_addr = ioaddr + mear;
    u32 read_cmd = location | EEread;

    outl(0, ee_addr);
    eeprom_delay();
    outl(EECLK, ee_addr);
    eeprom_delay();

    /* Shift the read command (9) bits out. */
    for (i = 8; i >= 0; i--) {
        u32 dataval = (read_cmd & (1 << i)) ? EEDI | EECS : EECS;
        outl(dataval, ee_addr);
        eeprom_delay();
        outl(dataval | EECLK, ee_addr);
        eeprom_delay();
    }
    outb(EECS, ee_addr);
    eeprom_delay();

    /* read the 16-bits data in */
    for (i = 16; i > 0; i--) {
        outl(EECS, ee_addr);
        eeprom_delay();
        outl(EECS | EECLK, ee_addr);
        eeprom_delay();
        retval = (retval << 1) | ((inl(ee_addr) & EEDO) ? 1 : 0);
        eeprom_delay();
    }
                
    /* Terminate the EEPROM access. */
    outl(0, ee_addr);
    eeprom_delay();
    outl(EECLK, ee_addr);

    return (retval);
}

#define sis900_mdio_delay()    inl(mdio_addr)


/* 
   Read and write the MII management registers using software-generated
   serial MDIO protocol. Note that the command bits and data bits are
   send out seperately 
*/

static void sis900_mdio_idle(long mdio_addr)
{
    outl(MDIO | MDDIR, mdio_addr);
    sis900_mdio_delay();
    outl(MDIO | MDDIR | MDC, mdio_addr);
}

/* Syncronize the MII management interface by shifting 32 one bits out. */
static void sis900_mdio_reset(long mdio_addr)
{
    int i;

    for (i = 31; i >= 0; i--) {
        outl(MDDIR | MDIO, mdio_addr);
        sis900_mdio_delay();
        outl(MDDIR | MDIO | MDC, mdio_addr);
        sis900_mdio_delay();
    }
    return;
}

static u16 sis900_mdio_read(int phy_id, int location)
{
    long mdio_addr = ioaddr + mear;
    int mii_cmd = MIIread|(phy_id<<MIIpmdShift)|(location<<MIIregShift);
    u16 retval = 0;
    int i;

    sis900_mdio_reset(mdio_addr);
    sis900_mdio_idle(mdio_addr);

    for (i = 15; i >= 0; i--) {
        int dataval = (mii_cmd & (1 << i)) ? MDDIR | MDIO : MDDIR;
        outl(dataval, mdio_addr);
        sis900_mdio_delay();
        outl(dataval | MDC, mdio_addr);
        sis900_mdio_delay();
    }

    /* Read the 16 data bits. */
    for (i = 16; i > 0; i--) {
        outl(0, mdio_addr);
        sis900_mdio_delay();
        retval = (retval << 1) | ((inl(mdio_addr) & MDIO) ? 1 : 0);
        outl(MDC, mdio_addr);
        sis900_mdio_delay();
    }
    outl(0x00, mdio_addr);
    return retval;
}

static void sis900_mdio_write(int phy_id, int location, int value)
{
    long mdio_addr = ioaddr + mear;
    int mii_cmd = MIIwrite|(phy_id<<MIIpmdShift)|(location<<MIIregShift);
    int i;

    sis900_mdio_reset(mdio_addr);
    sis900_mdio_idle(mdio_addr);

    /* Shift the command bits out. */
    for (i = 15; i >= 0; i--) {
        int dataval = (mii_cmd & (1 << i)) ? MDDIR | MDIO : MDDIR;
        outb(dataval, mdio_addr);
        sis900_mdio_delay();
        outb(dataval | MDC, mdio_addr);
        sis900_mdio_delay();
    }
    sis900_mdio_delay();

    /* Shift the value bits out. */
    for (i = 15; i >= 0; i--) {
        int dataval = (value & (1 << i)) ? MDDIR | MDIO : MDDIR;
        outl(dataval, mdio_addr);
        sis900_mdio_delay();
        outl(dataval | MDC, mdio_addr);
        sis900_mdio_delay();
    }
    sis900_mdio_delay();
        
    /* Clear out extra bits. */
    for (i = 2; i > 0; i--) {
        outb(0, mdio_addr);
        sis900_mdio_delay();
        outb(MDC, mdio_addr);
        sis900_mdio_delay();
    }
    outl(0x00, mdio_addr);
    return;
}


/* Function: sis900_init
 *
 * Description: resets the ethernet controller chip and various
 *    data structures required for sending and receiving packets.
 *    
 * Arguments: struct nic *nic:          NIC data structure
 *
 * returns:   void.
 */

static void
sis900_init(struct nic *nic)
{
    /* Soft reset the chip. */
    sis900_reset(nic);

    sis900_init_rxfilter(nic);

    sis900_init_txd(nic);
    sis900_init_rxd(nic);

    sis900_set_rx_mode(nic);

    sis900_check_mode(nic);

    outl(RxENA| inl(ioaddr + cr), ioaddr + cr);
}


/* 
 * Function: sis900_reset
 *
 * Description: disables interrupts and soft resets the controller chip
 *
 * Arguments: struct nic *nic:          NIC data structure
 *
 * Returns:   void.
 */

static void 
sis900_reset(struct nic *nic __unused)
{
    int i = 0;
    u32 status = TxRCMP | RxRCMP;

    outl(0, ioaddr + ier);
    outl(0, ioaddr + imr);
    outl(0, ioaddr + rfcr);

    outl(RxRESET | TxRESET | RESET | inl(ioaddr + cr), ioaddr + cr);

    /* Check that the chip has finished the reset. */
    while (status && (i++ < 1000)) {
        status ^= (inl(isr + ioaddr) & status);
    }

    if( (pci_revision == SIS635A_900_REV) || (pci_revision == SIS900B_900_REV) )
            outl(PESEL | RND_CNT, ioaddr + cfg);
    else
            outl(PESEL, ioaddr + cfg);
}


/* Function: sis_init_rxfilter
 *
 * Description: sets receive filter address to our MAC address
 *
 * Arguments: struct nic *nic:          NIC data structure
 *
 * returns:   void.
 */

static void
sis900_init_rxfilter(struct nic *nic)
{
    u32 rfcrSave;
    int i;
        
    rfcrSave = inl(rfcr + ioaddr);

    /* disable packet filtering before setting filter */
    outl(rfcrSave & ~RFEN, rfcr + ioaddr);

    /* load MAC addr to filter data register */
    for (i = 0 ; i < 3 ; i++) {
        u32 w;

        w = (u32) *((u16 *)(nic->node_addr)+i);
        outl((i << RFADDR_shift), ioaddr + rfcr);
        outl(w, ioaddr + rfdr);

        if (sis900_debug > 0)
            printf("sis900_init_rxfilter: Receive Filter Addrss[%d]=%X\n",
                   i, inl(ioaddr + rfdr));
    }

    /* enable packet filitering */
    outl(rfcrSave | RFEN, rfcr + ioaddr);
}


/* 
 * Function: sis_init_txd
 *
 * Description: initializes the Tx descriptor
 *
 * Arguments: struct nic *nic:          NIC data structure
 *
 * returns:   void.
 */

static void
sis900_init_txd(struct nic *nic __unused)
{
    txd.link   = (u32) 0;
    txd.cmdsts = (u32) 0;
    txd.bufptr = virt_to_bus(&txb[0]);

    /* load Transmit Descriptor Register */
    outl(virt_to_bus(&txd), ioaddr + txdp); 
    if (sis900_debug > 0)
        printf("sis900_init_txd: TX descriptor register loaded with: %X\n", 
               inl(ioaddr + txdp));
}


/* Function: sis_init_rxd
 *
 * Description: initializes the Rx descriptor ring
 *    
 * Arguments: struct nic *nic:          NIC data structure
 *
 * Returns:   void.
 */

static void 
sis900_init_rxd(struct nic *nic __unused) 
{ 
    int i;

    cur_rx = 0; 

    /* init RX descriptor */
    for (i = 0; i < NUM_RX_DESC; i++) {
        rxd[i].link   = virt_to_bus((i+1 < NUM_RX_DESC) ? &rxd[i+1] : &rxd[0]);
        rxd[i].cmdsts = (u32) RX_BUF_SIZE;
        rxd[i].bufptr = virt_to_bus(&rxb[i*RX_BUF_SIZE]);
        if (sis900_debug > 0)
            printf("sis900_init_rxd: rxd[%d]=%X link=%X cmdsts=%X bufptr=%X\n", 
                   i, &rxd[i], rxd[i].link, rxd[i].cmdsts, rxd[i].bufptr);
    }

    /* load Receive Descriptor Register */
    outl(virt_to_bus(&rxd[0]), ioaddr + rxdp);

    if (sis900_debug > 0)
        printf("sis900_init_rxd: RX descriptor register loaded with: %X\n", 
               inl(ioaddr + rxdp));

}


/* Function: sis_init_rxd
 *
 * Description: 
 *    sets the receive mode to accept all broadcast packets and packets
 *    with our MAC address, and reject all multicast packets.      
 *    
 * Arguments: struct nic *nic:          NIC data structure
 *
 * Returns:   void.
 */

static void sis900_set_rx_mode(struct nic *nic __unused)
{
    int i, table_entries;
    u32 rx_mode; 
    u16 mc_filter[16] = {0};	/* 256/128 bits multicast hash table */
    	
    if((pci_revision == SIS635A_900_REV) || (pci_revision == SIS900B_900_REV))
	table_entries = 16;
    else
	table_entries = 8;

    /* accept all multicast packet */
    rx_mode = RFAAB | RFAAM;
    for (i = 0; i < table_entries; i++)
		mc_filter[i] = 0xffff;
					
    /* update Multicast Hash Table in Receive Filter */
    for (i = 0; i < table_entries; i++) {
        /* why plus 0x04? That makes the correct value for hash table. */
        outl((u32)(0x00000004+i) << RFADDR_shift, ioaddr + rfcr);
        outl(mc_filter[i], ioaddr + rfdr);
    }

    /* Accept Broadcast and multicast packets, destination addresses that match 
       our MAC address */
    outl(RFEN | rx_mode, ioaddr + rfcr);

    return;
}


/* Function: sis900_check_mode
 *
 * Description: checks the state of transmit and receive
 *    parameters on the NIC, and updates NIC registers to match
 *    
 * Arguments: struct nic *nic:          NIC data structure
 *
 * Returns:   void.
 */

static void
sis900_check_mode(struct nic *nic)
{
    int speed, duplex;
    u32 tx_flags = 0, rx_flags = 0;

    mii.chip_info->read_mode(nic, cur_phy, &speed, &duplex);

    if( inl(ioaddr + cfg) & EDB_MASTER_EN ) {
        tx_flags = TxATP | (DMA_BURST_64 << TxMXDMA_shift) | (TX_FILL_THRESH << TxFILLT_shift);
	rx_flags = DMA_BURST_64 << RxMXDMA_shift;
    }
    else {
            tx_flags = TxATP | (DMA_BURST_512 << TxMXDMA_shift) | (TX_FILL_THRESH << TxFILLT_shift);
            rx_flags = DMA_BURST_512 << RxMXDMA_shift;
    }

    if (speed == HW_SPEED_HOME || speed == HW_SPEED_10_MBPS) {
        rx_flags |= (RxDRNT_10 << RxDRNT_shift);
        tx_flags |= (TxDRNT_10 << TxDRNT_shift);
    }
    else {
        rx_flags |= (RxDRNT_100 << RxDRNT_shift);
        tx_flags |= (TxDRNT_100 << TxDRNT_shift);
    }

    if (duplex == FDX_CAPABLE_FULL_SELECTED) {
        tx_flags |= (TxCSI | TxHBI);