/* Transmit DMA interrupt service */
static inline void sca_tx_intr(port_t *port)
{
struct net_device *dev = port_to_dev(port);
struct net_device_stats *stats = hdlc_stats(dev);
u16 dmac = get_dmac_tx(port);
card_t* card = port_to_card(port);
u8 stat;
spin_lock(&port->lock);
stat = sca_in(DSR_TX(phy_node(port)), card); /* read DMA Status */
/* Reset DSR status bits */
sca_out((stat & (DSR_EOT | DSR_EOM | DSR_BOF | DSR_COF)) | DSR_DWE,
DSR_TX(phy_node(port)), card);
while (1) {
pkt_desc __iomem *desc;
u32 desc_off = desc_offset(port, port->txlast, 1);
u32 cda = sca_ina(dmac + CDAL, card);
if ((cda >= desc_off) && (cda < desc_off + sizeof(pkt_desc)))
break; /* Transmitter is/will_be sending this frame */
desc = desc_address(port, port->txlast, 1);
stats->tx_packets++;
stats->tx_bytes += readw(&desc->len);
writeb(0, &desc->stat); /* Free descriptor */
port->txlast = next_desc(port, port->txlast, 1);
}
netif_wake_queue(dev);
spin_unlock(&port->lock);
}
/* Receive DMA interrupt service */
static inline void sca_rx_intr(port_t *port)
{
struct net_device *dev = port_to_dev(port);
u16 dmac = get_dmac_rx(port);
card_t *card = port_to_card(port);
u8 stat = sca_in(DSR_RX(phy_node(port)), card); /* read DMA Status */
/* Reset DSR status bits */
sca_out((stat & (DSR_EOT | DSR_EOM | DSR_BOF | DSR_COF)) | DSR_DWE,
DSR_RX(phy_node(port)), card);
if (stat & DSR_BOF)
/* Dropped one or more frames */
dev->stats.rx_over_errors++;
while (1) {
u32 desc_off = desc_offset(port, port->rxin, 0);
pkt_desc __iomem *desc;
u32 cda = sca_ina(dmac + CDAL, card);
if ((cda >= desc_off) && (cda < desc_off + sizeof(pkt_desc)))
break; /* No frame received */
desc = desc_address(port, port->rxin, 0);
stat = readb(&desc->stat);
if (!(stat & ST_RX_EOM))
port->rxpart = 1; /* partial frame received */
else if ((stat & ST_ERROR_MASK) || port->rxpart) {
dev->stats.rx_errors++;
if (stat & ST_RX_OVERRUN)
dev->stats.rx_fifo_errors++;
else if ((stat & (ST_RX_SHORT | ST_RX_ABORT |
ST_RX_RESBIT)) || port->rxpart)
dev->stats.rx_frame_errors++;
else if (stat & ST_RX_CRC)
dev->stats.rx_crc_errors++;
if (stat & ST_RX_EOM)
port->rxpart = 0; /* received last fragment */
} else
sca_rx(card, port, desc, port->rxin);
/* Set new error descriptor address */
sca_outa(desc_off, dmac + EDAL, card);
port->rxin = next_desc(port, port->rxin, 0);
}
/* make sure RX DMA is enabled */
sca_out(DSR_DE, DSR_RX(phy_node(port)), card);
}