diff options
Diffstat (limited to 'drivers/net/tulip/interrupt.c')
| -rw-r--r-- | drivers/net/tulip/interrupt.c | 337 |
1 files changed, 337 insertions, 0 deletions
diff --git a/drivers/net/tulip/interrupt.c b/drivers/net/tulip/interrupt.c new file mode 100644 index 000000000..6d70ffd70 --- /dev/null +++ b/drivers/net/tulip/interrupt.c @@ -0,0 +1,337 @@ +/* + drivers/net/tulip/interrupt.c + + Maintained by Jeff Garzik <jgarzik@mandrakesoft.com> + Copyright 2000 The Linux Kernel Team + Written/copyright 1994-1999 by Donald Becker. + + This software may be used and distributed according to the terms + of the GNU Public License, incorporated herein by reference. + + Please refer to Documentation/networking/tulip.txt for more + information on this driver. + +*/ + +#include "tulip.h" +#include <asm/io.h> +#include <linux/etherdevice.h> + + +int tulip_rx_copybreak; +int tulip_max_interrupt_work; + + + +static int tulip_refill_rx(struct net_device *dev) +{ + struct tulip_private *tp = (struct tulip_private *)dev->priv; + int entry; + int refilled = 0; + + /* Refill the Rx ring buffers. */ + for (; tp->cur_rx - tp->dirty_rx > 0; tp->dirty_rx++) { + entry = tp->dirty_rx % RX_RING_SIZE; + if (tp->rx_skbuff[entry] == NULL) { + struct sk_buff *skb; + skb = tp->rx_skbuff[entry] = dev_alloc_skb(PKT_BUF_SZ); + if (skb == NULL) + break; + skb->dev = dev; /* Mark as being used by this device. */ + tp->rx_ring[entry].buffer1 = virt_to_le32desc(skb->tail); + refilled++; + } + tp->rx_ring[entry].status = cpu_to_le32(DescOwned); + } + return refilled; +} + + +static int tulip_rx(struct net_device *dev) +{ + struct tulip_private *tp = (struct tulip_private *)dev->priv; + int entry = tp->cur_rx % RX_RING_SIZE; + int rx_work_limit = tp->dirty_rx + RX_RING_SIZE - tp->cur_rx; + int received = 0; + + if (tulip_debug > 4) + printk(KERN_DEBUG " In tulip_rx(), entry %d %8.8x.\n", entry, + tp->rx_ring[entry].status); + /* If we own the next entry, it is a new packet. Send it up. */ + while ( ! (tp->rx_ring[entry].status & cpu_to_le32(DescOwned))) { + s32 status = le32_to_cpu(tp->rx_ring[entry].status); + + if (tulip_debug > 5) + printk(KERN_DEBUG "%s: In tulip_rx(), entry %d %8.8x.\n", + dev->name, entry, status); + if (--rx_work_limit < 0) + break; + if ((status & 0x38008300) != 0x0300) { + if ((status & 0x38000300) != 0x0300) { + /* Ingore earlier buffers. */ + if ((status & 0xffff) != 0x7fff) { + if (tulip_debug > 1) + printk(KERN_WARNING "%s: Oversized Ethernet frame " + "spanned multiple buffers, status %8.8x!\n", + dev->name, status); + tp->stats.rx_length_errors++; + } + } else if (status & RxDescFatalErr) { + /* There was a fatal error. */ + if (tulip_debug > 2) + printk(KERN_DEBUG "%s: Receive error, Rx status %8.8x.\n", + dev->name, status); + tp->stats.rx_errors++; /* end of a packet.*/ + if (status & 0x0890) tp->stats.rx_length_errors++; + if (status & 0x0004) tp->stats.rx_frame_errors++; + if (status & 0x0002) tp->stats.rx_crc_errors++; + if (status & 0x0001) tp->stats.rx_fifo_errors++; + } + } else { + /* Omit the four octet CRC from the length. */ + short pkt_len = ((status >> 16) & 0x7ff) - 4; + struct sk_buff *skb; + +#ifndef final_version + if (pkt_len > 1518) { + printk(KERN_WARNING "%s: Bogus packet size of %d (%#x).\n", + dev->name, pkt_len, pkt_len); + pkt_len = 1518; + tp->stats.rx_length_errors++; + } +#endif + /* Check if the packet is long enough to accept without copying + to a minimally-sized skbuff. */ + if (pkt_len < tulip_rx_copybreak + && (skb = dev_alloc_skb(pkt_len + 2)) != NULL) { + skb->dev = dev; + skb_reserve(skb, 2); /* 16 byte align the IP header */ +#if ! defined(__alpha__) + eth_copy_and_sum(skb, tp->rx_skbuff[entry]->tail, pkt_len, 0); + skb_put(skb, pkt_len); +#else + memcpy(skb_put(skb, pkt_len), tp->rx_skbuff[entry]->tail, + pkt_len); +#endif + } else { /* Pass up the skb already on the Rx ring. */ + char *temp = skb_put(skb = tp->rx_skbuff[entry], pkt_len); + tp->rx_skbuff[entry] = NULL; +#ifndef final_version + if (le32desc_to_virt(tp->rx_ring[entry].buffer1) != temp) + printk(KERN_ERR "%s: Internal fault: The skbuff addresses " + "do not match in tulip_rx: %p vs. %p / %p.\n", + dev->name, + le32desc_to_virt(tp->rx_ring[entry].buffer1), + skb->head, temp); +#endif + } + skb->protocol = eth_type_trans(skb, dev); + netif_rx(skb); + dev->last_rx = jiffies; + tp->stats.rx_packets++; + tp->stats.rx_bytes += pkt_len; + } + received++; + entry = (++tp->cur_rx) % RX_RING_SIZE; + } + + return received; +} + + +/* The interrupt handler does all of the Rx thread work and cleans up + after the Tx thread. */ +void tulip_interrupt(int irq, void *dev_instance, struct pt_regs *regs) +{ + struct net_device *dev = (struct net_device *)dev_instance; + struct tulip_private *tp = (struct tulip_private *)dev->priv; + long ioaddr = dev->base_addr; + int csr5; + int entry; + int missed; + int rx = 0; + int tx = 0; + int oi = 0; + int maxrx = RX_RING_SIZE; + int maxtx = TX_RING_SIZE; + int maxoi = TX_RING_SIZE; + int work_count = tulip_max_interrupt_work; + + tp->nir++; + + do { + csr5 = inl(ioaddr + CSR5); + /* Acknowledge all of the current interrupt sources ASAP. */ + outl(csr5 & 0x0001ffff, ioaddr + CSR5); + + if (tulip_debug > 4) + printk(KERN_DEBUG "%s: interrupt csr5=%#8.8x new csr5=%#8.8x.\n", + dev->name, csr5, inl(dev->base_addr + CSR5)); + + if ((csr5 & (NormalIntr|AbnormalIntr)) == 0) + break; + + if (csr5 & (RxIntr | RxNoBuf)) { + rx += tulip_rx(dev); + tulip_refill_rx(dev); + } + + if (csr5 & (TxNoBuf | TxDied | TxIntr | TimerInt)) { + unsigned int dirty_tx; + + spin_lock(&tp->lock); + + for (dirty_tx = tp->dirty_tx; tp->cur_tx - dirty_tx > 0; + dirty_tx++) { + int entry = dirty_tx % TX_RING_SIZE; + int status = le32_to_cpu(tp->tx_ring[entry].status); + + if (status < 0) + break; /* It still has not been Txed */ + /* Check for Rx filter setup frames. */ + if (tp->tx_skbuff[entry] == NULL) + continue; + + if (status & 0x8000) { + /* There was an major error, log it. */ +#ifndef final_version + if (tulip_debug > 1) + printk(KERN_DEBUG "%s: Transmit error, Tx status %8.8x.\n", + dev->name, status); +#endif + tp->stats.tx_errors++; + if (status & 0x4104) tp->stats.tx_aborted_errors++; + if (status & 0x0C00) tp->stats.tx_carrier_errors++; + if (status & 0x0200) tp->stats.tx_window_errors++; + if (status & 0x0002) tp->stats.tx_fifo_errors++; + if ((status & 0x0080) && tp->full_duplex == 0) + tp->stats.tx_heartbeat_errors++; +#ifdef ETHER_STATS + if (status & 0x0100) tp->stats.collisions16++; +#endif + } else { +#ifdef ETHER_STATS + if (status & 0x0001) tp->stats.tx_deferred++; +#endif + tp->stats.tx_bytes += tp->tx_skbuff[entry]->len; + tp->stats.collisions += (status >> 3) & 15; + tp->stats.tx_packets++; + } + + /* Free the original skb. */ + dev_kfree_skb_irq(tp->tx_skbuff[entry]); + tp->tx_skbuff[entry] = 0; + tx++; + } + +#ifndef final_version + if (tp->cur_tx - dirty_tx > TX_RING_SIZE) { + printk(KERN_ERR "%s: Out-of-sync dirty pointer, %d vs. %d, full=%d.\n", + dev->name, dirty_tx, tp->cur_tx, tp->tx_full); + dirty_tx += TX_RING_SIZE; + } +#endif + + if (tp->tx_full && tp->cur_tx - dirty_tx < TX_RING_SIZE - 2) { + /* The ring is no longer full, clear tbusy. */ + tp->tx_full = 0; + netif_wake_queue(dev); + } + + tp->dirty_tx = dirty_tx; + if (csr5 & TxDied) { + if (tulip_debug > 2) + printk(KERN_WARNING "%s: The transmitter stopped." + " CSR5 is %x, CSR6 %x, new CSR6 %x.\n", + dev->name, csr5, inl(ioaddr + CSR6), tp->csr6); + tulip_outl_CSR6(tp, tp->csr6 | 0x0002); + tulip_outl_CSR6(tp, tp->csr6 | 0x2002); + } + spin_unlock(&tp->lock); + } + + /* Log errors. */ + if (csr5 & AbnormalIntr) { /* Abnormal error summary bit. */ + if (csr5 == 0xffffffff) + break; + if (csr5 & TxJabber) tp->stats.tx_errors++; + if (csr5 & TxFIFOUnderflow) { + if ((tp->csr6 & 0xC000) != 0xC000) + tp->csr6 += 0x4000; /* Bump up the Tx threshold */ + else + tp->csr6 |= 0x00200000; /* Store-n-forward. */ + /* Restart the transmit process. */ + tulip_outl_CSR6(tp, tp->csr6 | 0x0002); + tulip_outl_CSR6(tp, tp->csr6 | 0x2002); + outl(0, ioaddr + CSR1); + } + if (csr5 & RxDied) { /* Missed a Rx frame. */ + tp->stats.rx_errors++; + tp->stats.rx_missed_errors += inl(ioaddr + CSR8) & 0xffff; + tulip_outl_CSR6(tp, tp->csr6 | 0x2002); + } + if (csr5 & (TPLnkPass | TPLnkFail | 0x08000000)) { + if (tp->link_change) + (tp->link_change)(dev, csr5); + } + if (csr5 & SytemError) { + printk(KERN_ERR "%s: (%lu) System Error occured\n", dev->name, tp->nir); + } + /* Clear all error sources, included undocumented ones! */ + outl(0x0800f7ba, ioaddr + CSR5); + oi++; + } + if (csr5 & TimerInt) { +#if 0 + if (tulip_debug > 2) + printk(KERN_ERR "%s: Re-enabling interrupts, %8.8x.\n", + dev->name, csr5); + outl(tulip_tbl[tp->chip_id].valid_intrs, ioaddr + CSR7); +#endif + tp->ttimer = 0; + oi++; + } + if (tx > maxtx || rx > maxrx || oi > maxoi) { + if (tulip_debug > 1) + printk(KERN_WARNING "%s: Too much work during an interrupt, " + "csr5=0x%8.8x. (%lu) (%d,%d,%d)\n", dev->name, csr5, tp->nir, tx, rx, oi); + /* Acknowledge all interrupt sources. */ +#if 0 + /* Clear all interrupting sources, set timer to re-enable. */ + outl(((~csr5) & 0x0001ebef) | NormalIntr | AbnormalIntr | TimerInt, + ioaddr + CSR7); + outl(12, ioaddr + CSR11); + tp->ttimer = 1; +#endif + break; + } + } while (work_count-- > 0); + + tulip_refill_rx(dev); + + /* check if we card is in suspend mode */ + entry = tp->dirty_rx % RX_RING_SIZE; + if (tp->rx_skbuff[entry] == NULL) { + if (tulip_debug > 1) + printk(KERN_WARNING "%s: in rx suspend mode: (%lu) (tp->cur_rx = %u, ttimer = %d, rx = %d) go/stay in suspend mode\n", dev->name, tp->nir, tp->cur_rx, tp->ttimer, rx); + if (tp->ttimer == 0 || (inl(ioaddr + CSR11) & 0xffff) == 0) { + if (tulip_debug > 1) + printk(KERN_WARNING "%s: in rx suspend mode: (%lu) set timer\n", dev->name, tp->nir); + outl(tulip_tbl[tp->chip_id].valid_intrs | TimerInt, + ioaddr + CSR7); + outl(TimerInt, ioaddr + CSR5); + outl(12, ioaddr + CSR11); + tp->ttimer = 1; + } + } + + if ((missed = inl(ioaddr + CSR8) & 0x1ffff)) { + tp->stats.rx_dropped += missed & 0x10000 ? 0x10000 : missed; + } + + if (tulip_debug > 4) + printk(KERN_DEBUG "%s: exiting interrupt, csr5=%#4.4x.\n", + dev->name, inl(ioaddr + CSR5)); + +} + |