/* Receive DMA service */
static inline int sca_rx_done(port_t *port, int budget)
{
struct net_device *dev = port->netdev;
u16 dmac = get_dmac_rx(port);
card_t *card = port->card;
u8 stat = sca_in(DSR_RX(port->chan), card); /* read DMA Status */
int received = 0;
/* Reset DSR status bits */
sca_out((stat & (DSR_EOT | DSR_EOM | DSR_BOF | DSR_COF)) | DSR_DWE,
DSR_RX(port->chan), card);
if (stat & DSR_BOF)
/* Dropped one or more frames */
dev->stats.rx_over_errors++;
while (received < budget) {
u32 desc_off = hd_desc_offset(port, port->rxin, 0);
pkt_desc __iomem *desc;
u32 cda = sca_inl(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);
received++;
}
/* Set new error descriptor address */
sca_outl(desc_off, dmac + EDAL, card);
port->rxin = (port->rxin + 1) % card->rx_ring_buffers;
}
/* make sure RX DMA is enabled */
sca_out(DSR_DE, DSR_RX(port->chan), card);
return received;
}
/* 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_inw(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_outw(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);
}
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);
sca_out((stat & (DSR_EOT | DSR_EOM | DSR_BOF | DSR_COF)) | DSR_DWE,
DSR_RX(phy_node(port)), card);
if (stat & DSR_BOF)
dev->stats.rx_over_errors++;
while (1) {
u32 desc_off = desc_offset(port, port->rxin, 0);
pkt_desc __iomem *desc;
u32 cda = sca_inw(dmac + CDAL, card);
if ((cda >= desc_off) && (cda < desc_off + sizeof(pkt_desc)))
break;
desc = desc_address(port, port->rxin, 0);
stat = readb(&desc->stat);
if (!(stat & ST_RX_EOM))
port->rxpart = 1;
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;
} else
sca_rx(card, port, desc, port->rxin);
sca_outw(desc_off, dmac + EDAL, card);
port->rxin = next_desc(port, port->rxin, 0);
}
sca_out(DSR_DE, DSR_RX(phy_node(port)), card);
}
