if_mahwah.c

Intel XScale PXA255 引导Linux的Redboot 版bootloader源代码！

    // Terminate the EEPROM access.
    OUTW(EE_ENB & ~EE_CS, ee_addr);
    eeprom_delay(EEPROM_DONE_DELAY);
    
    return retval;
}


// ------------------------------------------------------------------------
//
//                NETWORK INTERFACE INITIALIZATION
//
//  Function : Init82559
//
//  Description :
//       This routine resets, configures, and initializes the chip.
//       It also clears the ethernet statistics structure, and selects
//       which statistics are supported by this driver.
//
// ------------------------------------------------------------------------
static bool
mahwah_i82559_init(struct cyg_netdevtab_entry * ndp)
{
    static int initialized = 0; // only probe PCI et al *once*

    struct eth_drv_sc *sc;
    cyg_uint32 selftest;
    volatile cyg_uint32 *p_selftest;
    cyg_uint32 ioaddr;
    cyg_uint16 checksum;
    int count;
    int i, ints;
    int addr_length;
    cyg_uint8 mac_address[6];
    struct i82559 *p_i82559;

#ifdef DEBUG
    db_printf("mahwah_i82559_init(%x)\n", ndp);
#endif

    sc = (struct eth_drv_sc *)(ndp->device_instance);
    p_i82559 = (struct i82559 *)(sc->driver_private);

    IF_BAD_82559( p_i82559 ) {
#ifdef DEBUG
        os_printf( "Bad device private pointer %x\n", sc->driver_private );
#endif
        return 0;
    }

    CHECK_NDP_SC_LINK();

    if ( 0 == initialized++ ) {
        // then this is the first time ever:
        if ( ! pci_init_find_82559s() ) {
#ifdef DEBUG
            os_printf( "pci_init_find_82559s failed" );
#endif
            return 0;
        }
    }

    if ( ! p_i82559->found ) // no device on PCI bus
        return (0);

    ioaddr = p_i82559->io_address; // get I/O address for 82559

#ifdef DEBUG
    os_printf("Init82559 %d @ %x\n82559 Self Test\n",
              p_i82559->index, (int)ndp);
#endif

    ints = Mask82559Interrupt(p_i82559);

    wait_for_cmd_done(ioaddr); // make sure no command operating

    i82559_reset(p_i82559);

    // Perform a system self-test. (get enough mem to round address)
    if ( (selftest = (cyg_uint32)pciwindow_mem_alloc(32) ) == 0)
        return (0);
    p_selftest = (cyg_uint32 *) ((selftest + 15) & ~0xf);
    p_selftest[0] = p_selftest[1] = -1;
        
    OUTL( (VIRT_TO_BUS(p_selftest)) | I82559_SELFTEST, ioaddr + SCBPort);
    count = 0x7FFFF;                // Timeout for self-test.
    do {
        udelay(10);
    } while ( (p_selftest[1] == -1)  &&  (--count >= 0) );

    Acknowledge82559Interrupt(p_i82559);
    UnMask82559Interrupt(p_i82559, ints );
    
    if (count < 0) {
        // Test timed out.
#ifdef DEBUG
        os_printf("Self test failed\n");
#endif
        return (0);
    }
#ifdef DEBUG
    os_printf("  General self-test: %s.\n"
              "  Serial sub-system self-test: %s.\n"
              "  Internal registers self-test: %s.\n"
              "  ROM checksum self-test: %s (%08X).\n",
              p_selftest[1] & 0x1000 ? "failed" : "passed",
              p_selftest[1] & 0x0020 ? "failed" : "passed",
              p_selftest[1] & 0x0008 ? "failed" : "passed",
              p_selftest[1] & 0x0004 ? "failed" : "passed",
              p_selftest[0]);
#endif

    // read eeprom and get 82559's mac address
    addr_length = get_eeprom_size(ioaddr);
    // (this is the length of the *EEPROM*s address, not MAC address)

    for (checksum = 0, i = 0, count = 0; count < 64; count++) {
        cyg_uint16 value;
        // read word from eeprom
        value = read_eeprom(ioaddr, count, addr_length);
#ifdef DEBUG_EE
        // os_printf( "%2d: %04x\n", count, value );
#endif
        checksum += value;
        if (count < 3) {
            mac_address[i++] = value & 0xFF;
            mac_address[i++] = (value >> 8) & 0xFF;
        }
    }

    // If the EEPROM checksum is wrong, the MAC address read from the
    // EEPROM is probably wrong as well. In that case, we don't set
    // mac_addr_ok, but continue the initialization. If then somebody calls
    // i82559_start without calling eth_set_mac_address() first, we refuse
    // to bring up the interface, because running with an invalid MAC
    // address is not a very brilliant idea.

    if ((checksum & 0xFFFF) != 0xBABA)  {
        // selftest verified checksum, verify again
#ifdef DEBUG_EE
        os_printf( "Warning: Invalid EEPROM checksum %04X for device %d\n",
                   checksum, p_i82559->index);
#endif
#if 0
    } else {
#else
    } if (1) {
#endif
        p_i82559->mac_addr_ok = 1;
#ifdef DEBUG_EE
        os_printf("Valid EEPROM checksum\n");
#endif
    }
#ifdef DEBUG
    os_printf("MAC Address = %02X %02X %02X %02X %02X %02X\n",
              mac_address[0], mac_address[1], mac_address[2], mac_address[3],
              mac_address[4], mac_address[5]);
#endif

    // record the MAC address in the device structure
    p_i82559->mac_address[0] = mac_address[0];
    p_i82559->mac_address[1] = mac_address[1];
    p_i82559->mac_address[2] = mac_address[2];
    p_i82559->mac_address[3] = mac_address[3];
    p_i82559->mac_address[4] = mac_address[4];
    p_i82559->mac_address[5] = mac_address[5];
    
    // and record the net dev pointer
    p_i82559->ndp = (void *)ndp;
    
    InitRxRing(p_i82559);
    InitTxRing(p_i82559);

    // Initialize upper level driver
    if ( p_i82559->mac_addr_ok )
        (sc->funs->eth_drv->init)(sc, &(p_i82559->mac_address[0]) );
    else
        (sc->funs->eth_drv->init)(sc, 0 );

    return (1);
}

// ------------------------------------------------------------------------
//
//  Function : i82559_start
//
// ------------------------------------------------------------------------
static void i82559_start( struct eth_drv_sc *sc,
                          unsigned char *enaddr, int flags )
{
    struct i82559 *p_i82559;
    cyg_uint32 ioaddr;
#ifdef KEEP_STATISTICS
    void *p_statistics;
#endif
#ifdef CYGPKG_NET
    struct ifnet *ifp = &sc->sc_arpcom.ac_if;
#endif

    p_i82559 = (struct i82559 *)sc->driver_private;
    
    IF_BAD_82559( p_i82559 ) {
#ifdef DEBUG
        os_printf( "i82559_start: Bad device pointer %x\n", p_i82559 );
#endif
        return;
    }

    if ( ! p_i82559->mac_addr_ok ) {
#ifdef DEBUG
        os_printf("i82559_start %d: invalid MAC address, "
                  "can't bring up interface\n",
                  p_i82559->index );
#endif
        return;
    }

    if ( p_i82559->active )
        i82559_stop( sc );

    ioaddr = p_i82559->io_address; // get 82559's I/O address

#ifdef KEEP_STATISTICS
#ifdef CYGDBG_DEVS_ETH_ARM_MAHWAH_KEEP_82559_STATISTICS
    p_i82559->p_statistics =
        p_statistics = pciwindow_mem_alloc(sizeof(I82559_COUNTERS));
    memset(p_statistics, 0xFFFFFFFF, sizeof(I82559_COUNTERS));
    wait_for_cmd_done(ioaddr); // make sure no command operating
                                        // set statistics dump address
    OUTL(VIRT_TO_BUS(p_statistics), ioaddr + SCBPointer);
    OUTW(SCB_M | CU_STATSADDR, ioaddr + SCBCmd);

    wait_for_cmd_done(ioaddr); // make sure no command operating
    OUTW(SCB_M | CU_DUMPSTATS, ioaddr + SCBCmd); // start register dump
#endif
#endif

    // Set the base address
    wait_for_cmd_done(ioaddr);
    OUTL(0, ioaddr + SCBPointer);       // load ru base address = 0
    OUTW(SCB_M | RUC_ADDR_LOAD, ioaddr + SCBCmd);
    udelay( 1000 );                     // load pointer to Rx Ring
    OUTL(VIRT_TO_BUS(p_i82559->rx_ring[0]), ioaddr + SCBPointer);
    OUTW(RUC_START, ioaddr + SCBCmd);
    
    p_i82559->active = 1;

#ifdef CYGPKG_NET
    if (( 0
#ifdef ETH_DRV_FLAGS_PROMISC_MODE
         != (flags & ETH_DRV_FLAGS_PROMISC_MODE)
#endif
        ) || (ifp->if_flags & IFF_PROMISC)
        ) {
        eth_set_promiscuous_mode(p_i82559);
    }
#endif
#ifdef DEBUG
    {
        int status = i82559_status( sc );
        os_printf("i82559_start %d flg %x Link = %s, %s Mbps, %s Duplex\n",
                  p_i82559->index,
                  *(int *)p_i82559,
                  status & GEN_STATUS_LINK ? "Up" : "Down",
                  status & GEN_STATUS_100MBPS ?  "100" : "10",
                  status & GEN_STATUS_FDX ? "Full" : "Half");
    }
#endif
}

// ------------------------------------------------------------------------
//
//  Function : i82559_status
//
// ------------------------------------------------------------------------
int i82559_status( struct eth_drv_sc *sc )
{
    int status;
    struct i82559 *p_i82559;
    cyg_uint32 ioaddr;
    p_i82559 = (struct i82559 *)sc->driver_private;
    
    IF_BAD_82559( p_i82559 ) {
#ifdef DEBUG
        os_printf( "i82559_status: Bad device pointer %x\n", p_i82559 );
#endif
        return 0;
    }

    ioaddr = p_i82559->io_address; // get 82559's I/O address

    status = INB(ioaddr + SCBGenStatus);

    return status;
}

// ------------------------------------------------------------------------
//
//  Function : BringDown82559
//
// ------------------------------------------------------------------------

static void i82559_stop( struct eth_drv_sc *sc )
{
    struct i82559 *p_i82559;

    p_i82559 = (struct i82559 *)sc->driver_private;

    IF_BAD_82559( p_i82559 ) {
#ifdef DEBUG
        os_printf( "i82559_stop: Bad device pointer %x\n", p_i82559 );
#endif
        return;
    }
   
#ifdef DEBUG
    os_printf("i82559_stop %d flg %x\n", p_i82559->index, *(int *)p_i82559 );
#endif

    p_i82559->active = 0;               // stop people tormenting it
    i82559_reset(p_i82559);             // that should stop it

    ResetRxRing( p_i82559 );
    ResetTxRing( p_i82559 );
}


// ------------------------------------------------------------------------
//
//  Function : InitRxRing
//
// ------------------------------------------------------------------------
static void InitRxRing(struct i82559* p_i82559)
{
    int i;
    RFD *rfd;
    RFD *p_rfd = 0;
#ifdef DEBUG_82559
    os_printf("InitRxRing %d\n", p_i82559->index);
#endif
    for ( i = 0; i < MAX_RX_DESCRIPTORS; i++ ) {
        rfd = (RFD *)pciwindow_mem_alloc(sizeof(RFD) + MAX_RX_PACKET_SIZE);
        p_i82559->rx_ring[i] = rfd;
        if ( i )
            p_rfd->link = VIRT_TO_BUS(rfd);
        p_rfd = (RFD *)rfd;
    }
    // link last RFD to first:
    p_rfd->link = VIRT_TO_BUS(p_i82559->rx_ring[0]);

    ResetRxRing( p_i82559 );
}

// ------------------------------------------------------------------------
//
//  Function : ResetRxRing
//
// ------------------------------------------------------------------------
static void ResetRxRing(struct i82559* p_i82559)
{
    RFD *p_rfd;
    int i;
#ifdef DEBUG_82559
    os_printf("ResetRxRing %d\n", p_i82559->index);
#endif
    for ( i = 0; i < MAX_RX_DESCRIPTORS; i++ ) {
        p_rfd = p_i82559->rx_ring[i];
        CYG_ASSERT( (cyg_uint8 *)p_rfd >= i82559_heap_base, "rfd under" );
        CYG_ASSERT( (cyg_uint8 *)p_rfd <  i82559_heap_free, "rfd over" );
        CYG_ASSERT( p_i82559->rx_ring[
                 ( i ? (i-1) : (MAX_RX_DESCRIPTORS-1) )
            ]->link == VIRT_TO_BUS(p_rfd), "rfd linked list broken" );
        p_rfd->rxstatus = 0;
        p_rfd->count = 0;
        p_rfd->f = 0;
        p_rfd->eof = 0;
        p_rfd->rdb_address = 0xFFFFFFFF;
        p_rfd->size = MAX_RX_PACKET_SIZE;
    }
    p_i82559->next_rx_descriptor = 0;
    // And set an end-of-list marker in the previous one.
    p_rfd->rxstatus = RFD_STATUS_EL;
}

// ------------------------------------------------------------------------
//
//  Function : PacketRxReady        (Called from delivery thread)
//
// ------------------------------------------------------------------------
static void PacketRxReady(struct i82559* p_i82559)
{
    RFD *p_rfd;
    int next_descriptor;
    int length, ints;
    struct cyg_netdevtab_entry *ndp;