if_atlas.c

来自「eCos操作系统源码」· C语言 代码 · 共 1,055 行 · 第 1/2 页

                unsigned long __base = spd->base;
                SAA9730_EVM_IER_SW |= (SAA9730_EVM_LAN_INT|SAA9730_EVM_MASTER);                
                SAA9730_EVM_IER |= (SAA9730_EVM_LAN_INT|SAA9730_EVM_MASTER);
                SAA9730_EVM_ISR |= (SAA9730_EVM_LAN_INT|SAA9730_EVM_MASTER);
            }

#ifdef DEBUG
	    db_printf(" **** Device enabled for I/O and Memory and Bus Master\n");
#endif

        } else {
#ifdef DEBUG
            db_printf("eth0 not found\n");
#endif
        }

        saa9730_stop(sc);
        
	spd->active = 0;

	initialized = 1;
    }

    // Fetch hardware address
#if defined(CYGPKG_REDBOOT) && \
    defined(CYGSEM_REDBOOT_FLASH_CONFIG) && \
    !defined(CYGSEM_MIPS_ATLAS_SET_ESA)
    flash_get_config("atlas_esa", enaddr, CONFIG_ESA);
#else
#define CONFIG_ESA     6
    CYGACC_CALL_IF_FLASH_CFG_OP( CYGNUM_CALL_IF_FLASH_CFG_GET,
                                 "atlas_esa", enaddr, CONFIG_ESA );
#ifdef DEBUG
    db_printf("ESA: %02x:%02x:%02x:%02x:%02x:%02x\n",
              enaddr[0],enaddr[1],enaddr[2],enaddr[3],enaddr[4],enaddr[5]);
#endif
#endif

    saa9730_reset(spd);

    // Initialize upper level driver
    (sc->funs->eth_drv->init)(sc, enaddr);

    return true;
}

static void
saa9730_stop(struct eth_drv_sc *sc)
{
    struct saa9730_priv_data *spd = (struct saa9730_priv_data *)sc->driver_private;
    unsigned long __base = spd->base;

    // Stop DMA
    SAA9730_DMACTL &= ~(SAA9730_DMACTL_ENRX | SAA9730_DMACTL_ENTX);

    // Stop tx/rx
    SAA9730_TXCTL &= ~SAA9730_TXCTL_ENTX;
    SAA9730_RXCTL &= ~SAA9730_RXCTL_ENRX;

    // Set DMA and MAC reset bits
    SAA9730_DMATST |= SAA9730_DMATST_RESET;
    SAA9730_MACCTL |= SAA9730_MACCTL_RESET;

    spd->active = 0;
}

static void
__do_start(struct saa9730_priv_data *spd)
{
    unsigned long __base = spd->base;
    int i;

    spd->active = 1;
    spd->tx_busy = 0;

    for (i = 0; i < SAA9730_BUFFERS; i++)
	spd->tx_used[i] = 0;

    // for tx, turn on MAC first
    SAA9730_TXCTL |= SAA9730_TXCTL_ENTX;
    SAA9730_DMACTL |= SAA9730_DMACTL_ENTX;

    // for rx, turn on DMA first
    SAA9730_DMACTL |= SAA9730_DMACTL_ENRX;
    SAA9730_RXCTL |= SAA9730_RXCTL_ENRX;

    __select_buffer(spd, spd->next_rx_bindex);    
}

//
// This function is called to "start up" the interface.  It may be called
// multiple times, even when the hardware is already running.  It will be
// called whenever something "hardware oriented" changes and should leave
// the hardware ready to send/receive packets.
//
static void
saa9730_start(struct eth_drv_sc *sc, unsigned char *enaddr, int flags)
{
    struct saa9730_priv_data *spd = (struct saa9730_priv_data *)sc->driver_private;

    if (spd->active)
	saa9730_stop(sc);

    __do_start(spd);
}

//
// This routine is called to perform special "control" opertions
//
static int
saa9730_control(struct eth_drv_sc *sc, unsigned long key,
               void *data, int data_length)
{
    switch (key) {
    case ETH_DRV_SET_MAC_ADDRESS:
        return 0;
        break;
    default:
        return 1;
        break;
    }
}

//
// This routine is called to see if it is possible to send another packet.
// It will return non-zero if a transmit is possible, zero otherwise.
//
static int
saa9730_can_send(struct eth_drv_sc *sc)
{
    struct saa9730_priv_data *spd = (struct saa9730_priv_data *)sc->driver_private;
    unsigned long __base = spd->base;

    __tx_poll(sc);

    if (spd->next_tx_bindex == 0  && (SAA9730_OK2USE & SAA9730_OK2USE_TXA))
        return 0;

    if (spd->next_tx_bindex == 1  && (SAA9730_OK2USE & SAA9730_OK2USE_TXB))
        return 0;

    return 1;
}


static int tx_poll_count;

//
// This routine is called to send data to the hardware.
static void 
saa9730_send(struct eth_drv_sc *sc, struct eth_drv_sg *sg_list, int sg_len, 
            int total_len, unsigned long key)
{
    struct saa9730_priv_data *spd = (struct saa9730_priv_data *)sc->driver_private;
    unsigned long __base = spd->base;
    int bindex, pindex;
    cyg_uint32 pktlen = total_len;
    cyg_uint8  *pktdata, *to_p;
    volatile cyg_uint32 *pktstat ;
    struct eth_drv_sg *last_sg;

#ifdef DEBUG
    db_printf("saa9730_send: %d sg's, %d bytes, KEY %x\n",
              sg_len, total_len, key );
#endif

    if (!spd->active)
	return;

    bindex = spd->next_tx_bindex;
    pindex = spd->next_tx_pindex;

    spd->next_tx_pindex++;
    if (spd->next_tx_pindex >= SAA9730_TXPKTS_PER_BUFFER) {
        spd->next_tx_pindex = 0;
        spd->next_tx_bindex ^= 1;
    }

    pktstat = spd->tx_buffer[bindex][pindex];
	
    if (bindex == 0 && (SAA9730_OK2USE & SAA9730_OK2USE_TXA))
        return;

    if (bindex == 1 && (SAA9730_OK2USE & SAA9730_OK2USE_TXB))
        return;

    spd->tx_key[bindex][pindex] = key;
    spd->tx_used[bindex] += 1;

    pktdata = (cyg_uint8 *)((unsigned)pktstat + 4);

    // Copy from the sglist into the tx buffer
    to_p = pktdata;

    for (last_sg = &sg_list[sg_len]; sg_list < last_sg; sg_list++) {
	cyg_uint8 *from_p;
	int l;
            
	from_p = (cyg_uint8 *)(sg_list->buf);
	l = sg_list->len;

	if (l > total_len)
	    l = total_len;

	memcpy((unsigned char *)to_p, from_p, l);
	to_p += l;
	total_len -= l;

	if (total_len < 0) 
	    break; // Should exit via sg_last normally
    }

    // pad to minimum size
    if (pktlen < SAA9730_MIN_PACKET_SIZE) {
        memset(to_p, 0, SAA9730_MIN_PACKET_SIZE-pktlen);
        pktlen = SAA9730_MIN_PACKET_SIZE;
    }

    // Set transmit status WORD for hardware (LAN-DMA-ENGINE)
    *pktstat = CYG_CPU_TO_LE32(TX_READY | pktlen);

    // start hardware
    if (bindex == 0)
        SAA9730_OK2USE |= SAA9730_OK2USE_TXA;
    else 
        SAA9730_OK2USE |= SAA9730_OK2USE_TXB;

    if (!spd->tx_busy) {
	tx_poll_count = 0;
	spd->tx_busy = bindex + 1;
    }
}


static void
__check_rxstate(struct saa9730_priv_data *spd)
{
    unsigned long __base = spd->base;
    cyg_uint32  status, flag, size;
    cyg_uint32  *pkt;
    int         i, j;

#ifdef DEBUG
    db_printf("__check_rxstate\n");        
#endif

#ifdef CYGPKG_REDBOOT
    // Clear SAA9730 LAN interrupt and re-enable interrupts.
    SAA9730_EVM_ISR = SAA9730_EVM_LAN_INT;
    SAA9730_EVM_IER_SW |= (SAA9730_EVM_LAN_INT|SAA9730_EVM_MASTER);
#endif
    
    if ((SAA9730_DBGRXS & SAA9730_DBGRXS_RXDII_MASK) == SAA9730_DBGRXS_RXDII_ERROR) {
        // re-init driver and controller
#ifdef DEBUG
        db_printf("DBGRXS: reset\n");
#endif
	saa9730_reset(spd);
	__do_start(spd);
	return;
    }

    // Check RX packet status
    for (i = 0; i < SAA9730_BUFFERS; i++) {
        for (j = 1; j < SAA9730_RXPKTS_PER_BUFFER; j++) {
            pkt = spd->rx_buffer[i][j];
            status = CYG_LE32_TO_CPU(*pkt);
            size   = status & RXPACKET_STATUS_SIZE_MASK;
            flag   = status & RXPACKET_STATUS_FLAG_MASK;
            if (flag == RX_INVALID_STAT || size > 1514 || *(pkt - 1)) {
		// re-init driver and controller
#ifdef DEBUG
                db_printf("rxpkt: reset\n");
#endif
		saa9730_reset(spd);
		__do_start(spd);
		return;
            }
        }
    }
}


static void
__tx_poll(struct eth_drv_sc *sc)
{
    struct saa9730_priv_data *spd = (struct saa9730_priv_data *)sc->driver_private;
    int	                 bindex, pindex;
    volatile cyg_uint32 *pktstat;
    cyg_uint32 status;

    if (!spd->tx_busy)
	return;

    bindex = spd->tx_busy - 1;
    pindex = spd->tx_used[bindex] - 1;  // watch last pkt in buffer

    pktstat = spd->tx_buffer[bindex][pindex];

    status = CYG_LE32_TO_CPU(*pktstat);
    if ((status & TXPACKET_STATUS_FLAG_MASK) != TX_HWDONE) {

	hal_delay_us(1000);

	if (++tx_poll_count > 1000) {
	    // reset

	    for (pindex = 0; pindex < spd->tx_used[bindex]; pindex++)
		(sc->funs->eth_drv->tx_done)(sc, spd->tx_key[bindex][pindex], 1);

	    bindex ^= 1;

	    for (pindex = 0; pindex < spd->tx_used[bindex]; pindex++)
		(sc->funs->eth_drv->tx_done)(sc, spd->tx_key[bindex][pindex], 1);

	    saa9730_reset(spd);
	    __do_start(spd);
	}
	return;
    }

    for (pindex = 0; pindex < spd->tx_used[bindex]; pindex++) {
	/* Check for error. */
	pktstat = spd->tx_buffer[bindex][pindex];
	status = CYG_LE32_TO_CPU(*pktstat);

	if (status & TXPACKET_STATUS_ERROR) {
	    if (status & TXPACKET_STATUS_EXDEFER)
		db_printf("tx deferred\n");

	    if (status & TXPACKET_STATUS_LATECOLLERR)
		db_printf("tx late collision\n");

	    if (status & TXPACKET_STATUS_LOSTCARRIER)
		db_printf("tx no carrier\n");

	    if (status & TXPACKET_STATUS_UNDERRUN)
		db_printf("tx underrun\n");

	    if (status & TXPACKET_STATUS_SQERR)
		db_printf("tx sq\n");
	}
	/* free the space */
	*pktstat = CYG_CPU_TO_LE32(TX_EMPTY);

	(sc->funs->eth_drv->tx_done)(sc, spd->tx_key[bindex][pindex], 1 /* status */);
    }

    tx_poll_count = 0;
    spd->tx_used[bindex] = 0;
    
    bindex ^= 1;
    if (spd->tx_used[bindex])
	spd->tx_busy = bindex + 1;
    else
	spd->tx_busy = 0;
}


static void
__rx_poll(struct eth_drv_sc *sc)
{
    struct saa9730_priv_data *spd = (struct saa9730_priv_data *)sc->driver_private;
    int	                 bindex, pindex, done;
    volatile cyg_uint32 *pkt;
    cyg_uint32           status, pktlen; 

#ifdef DEBUG
    db_printf("__rx_poll\n");
#endif
    if (!spd->active)
	return;

    done = 0;
    while (!done) {
        // index of next packet buffer
        bindex = spd->next_rx_bindex;

        // index of next packet within buffer
        pindex = spd->next_rx_pindex;

        pkt = spd->rx_buffer[bindex][pindex];

	// stop now if no more packets
        if (((status = CYG_LE32_TO_CPU(*pkt)) & RXPACKET_STATUS_FLAG_MASK) == RX_READY)
            break;
#ifdef DEBUG
        db_printf("__rx_poll pkt %08x status %08x\n",pkt,status);
#endif
	// if this is the first packet in a buffer, switch the SAA9730 to
	// use the next buffer for subsequent incoming packets.
	if (pindex == 0)
	    __select_buffer(spd, bindex == 0);
            
	// check for good packet
	if (status & RXPACKET_STATUS_GOOD) {

	    pktlen = status & RXPACKET_STATUS_SIZE_MASK ;

	    if (pktlen > 0) {
		(sc->funs->eth_drv->recv)(sc, pktlen);
		// done = 1;
	    }
	}
#ifdef DEBUG
        else
            db_printf("rx bad: %08x %08x\n",pkt,status);
#endif
        
	/* go to next packet in sequence */
	spd->next_rx_pindex++;
	if (spd->next_rx_pindex >= SAA9730_RXPKTS_PER_BUFFER) {
	    spd->next_rx_pindex = 0;
	    spd->next_rx_bindex++;
	    if (spd->next_rx_bindex >= SAA9730_BUFFERS) 
		spd->next_rx_bindex = 0;
	}
    }

    if (((poll_count++) % 100) == 0)
        __check_rxstate(spd);
}


static void
saa9730_recv(struct eth_drv_sc *sc, struct eth_drv_sg *sg_list, int sg_len)
{
    struct saa9730_priv_data *spd = (struct saa9730_priv_data *)sc->driver_private;
    volatile cyg_uint32 *pkt;
    cyg_uint32          pktlen, status;
    struct eth_drv_sg   *last_sg;

    if (!spd->active)
	return;

    pkt = spd->rx_buffer[spd->next_rx_bindex][spd->next_rx_pindex];

    status = CYG_LE32_TO_CPU(*pkt);
    if (status & RXPACKET_STATUS_GOOD) {
	// packet is good
	pktlen = status & RXPACKET_STATUS_SIZE_MASK;

	if (pktlen > 0) {
	    int total_len;
	    cyg_uint8 *from_p;

	    // check we have memory to copy into; we would be called even if
	    // caller was out of memory in order to maintain our state.
	    if (0 == sg_len || 0 == sg_list)
		return; // caller was out of mbufs

	    total_len = pktlen;
	    from_p = (cyg_uint8 *)((unsigned)pkt + 4);

	    for (last_sg = &sg_list[sg_len]; sg_list < last_sg; sg_list++) {
		cyg_uint8 *to_p;
		int l;
            
		to_p = (cyg_uint8 *)(sg_list->buf);
		l = sg_list->len;

		if (0 >= l || 0 == to_p)
		    return; // caller was out of mbufs

		if (l > total_len)
		    l = total_len;

		memcpy(to_p, (unsigned char *)from_p, l);
		from_p += l;
		total_len -= l;
	    }
	}
    }
}

static inline void
__do_deliver(struct eth_drv_sc *sc)
{
    // First pass any rx data up the stack
    __rx_poll(sc);

    // Then scan for completed Txen and inform the stack
    __tx_poll(sc);
}

static void
saa9730_poll(struct eth_drv_sc *sc)
{
    struct saa9730_priv_data *spd = (struct saa9730_priv_data *)sc->driver_private;

#ifndef CYGPKG_REDBOOT
    cyg_drv_interrupt_mask(spd->vector);
#endif

    (void)saa9730_isr(spd->vector, (cyg_addrword_t)spd);

    __do_deliver(sc);

    cyg_drv_interrupt_acknowledge(spd->vector);

#ifndef CYGPKG_REDBOOT
    cyg_drv_interrupt_unmask(spd->vector);
#endif    
}


// The deliver function (ex-DSR)  handles the ethernet [logical] processing
static void
saa9730_deliver(struct eth_drv_sc *sc)
{
    struct saa9730_priv_data *spd = (struct saa9730_priv_data *)sc->driver_private;
    unsigned long __base = spd->base;    

    if (spd->active)
	__do_deliver(sc);

    cyg_drv_interrupt_acknowledge(spd->vector);

#ifndef CYGPKG_REDBOOT
    // Clear SAA9730 LAN interrupt and re-enable interrupts.
    SAA9730_EVM_IER_SW |= (SAA9730_EVM_LAN_INT|SAA9730_EVM_MASTER);
    cyg_drv_interrupt_unmask(spd->vector);
#endif    
}