static int ag71xx_poll(struct napi_struct *napi, int limit)
{
struct ag71xx *ag = container_of(napi, struct ag71xx, napi);
#ifdef AG71XX_NAPI_TX
struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
#endif
struct net_device *dev = ag->dev;
unsigned long flags;
u32 status;
int done;
#ifdef AG71XX_NAPI_TX
ar71xx_ddr_flush(pdata->flush_reg);
ag71xx_tx_packets(ag);
#endif
DBG("%s: processing RX ring\n", dev->name);
done = ag71xx_rx_packets(ag, limit);
/* TODO: add OOM handler */
status = ag71xx_rr(ag, AG71XX_REG_INT_STATUS);
status &= AG71XX_INT_POLL;
if ((done < limit) && (!status)) {
DBG("%s: disable polling mode, done=%d, status=%x\n",
dev->name, done, status);
netif_rx_complete(dev, napi);
/* enable interrupts */
spin_lock_irqsave(&ag->lock, flags);
ag71xx_int_enable(ag, AG71XX_INT_POLL);
spin_unlock_irqrestore(&ag->lock, flags);
return 0;
}
if (status & AG71XX_INT_RX_OF) {
if (netif_msg_rx_err(ag))
printk(KERN_ALERT "%s: rx owerflow, restarting dma\n",
dev->name);
/* ack interrupt */
ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_OF);
/* restart RX */
ag71xx_wr(ag, AG71XX_REG_RX_CTRL, RX_CTRL_RXE);
}
DBG("%s: stay in polling mode, done=%d, status=%x\n",
dev->name, done, status);
return 1;
}
static irqreturn_t ag71xx_interrupt(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
struct ag71xx *ag = netdev_priv(dev);
u32 status;
status = ag71xx_rr(ag, AG71XX_REG_INT_STATUS);
status &= ag71xx_rr(ag, AG71XX_REG_INT_ENABLE);
if (unlikely(!status))
return IRQ_NONE;
if (unlikely(status & AG71XX_INT_ERR)) {
if (status & AG71XX_INT_TX_BE) {
ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_BE);
dev_err(&dev->dev, "TX BUS error\n");
}
if (status & AG71XX_INT_RX_BE) {
ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_BE);
dev_err(&dev->dev, "RX BUS error\n");
}
}
#if 0
if (unlikely(status & AG71XX_INT_TX_UR)) {
ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_UR);
DBG("%s: TX underrun\n", dev->name);
}
#endif
#ifndef AG71XX_NAPI_TX
if (likely(status & AG71XX_INT_TX_PS))
ag71xx_tx_packets(ag);
#endif
if (likely(status & AG71XX_INT_POLL)) {
ag71xx_int_disable(ag, AG71XX_INT_POLL);
DBG("%s: enable polling mode\n", dev->name);
netif_rx_schedule(dev, &ag->napi);
}
return IRQ_HANDLED;
}
static int ag71xx_poll(struct napi_struct *napi, int limit)
{
struct ag71xx *ag = container_of(napi, struct ag71xx, napi);
struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
struct net_device *dev = ag->dev;
struct ag71xx_ring *rx_ring;
unsigned long flags;
u32 status;
int done;
pdata->ddr_flush();
ag71xx_tx_packets(ag);
DBG("%s: processing RX ring\n", dev->name);
done = ag71xx_rx_packets(ag, limit);
rx_ring = &ag->rx_ring;
if (rx_ring->buf[rx_ring->dirty % AG71XX_RX_RING_SIZE].skb == NULL)
goto oom;
status = ag71xx_rr(ag, AG71XX_REG_RX_STATUS);
if (unlikely(status & RX_STATUS_OF)) {
ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_OF);
dev->stats.rx_fifo_errors++;
/* restart RX */
ag71xx_wr(ag, AG71XX_REG_RX_CTRL, RX_CTRL_RXE);
}
if (done < limit) {
if (status & RX_STATUS_PR)
goto more;
status = ag71xx_rr(ag, AG71XX_REG_TX_STATUS);
if (status & TX_STATUS_PS)
goto more;
DBG("%s: disable polling mode, done=%d, limit=%d\n",
dev->name, done, limit);
netif_rx_complete(dev, napi);
/* enable interrupts */
spin_lock_irqsave(&ag->lock, flags);
ag71xx_int_enable(ag, AG71XX_INT_POLL);
spin_unlock_irqrestore(&ag->lock, flags);
return done;
}
more:
DBG("%s: stay in polling mode, done=%d, limit=%d\n",
dev->name, done, limit);
return done;
oom:
if (netif_msg_rx_err(ag))
printk(KERN_DEBUG "%s: out of memory\n", dev->name);
mod_timer(&ag->oom_timer, jiffies + AG71XX_OOM_REFILL);
netif_rx_complete(dev, napi);
return 0;
}
