/*
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drivers/net/tulip/interrupt.c
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Maintained by Jeff Garzik <jgarzik@mandrakesoft.com>
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Copyright 2000,2001 The Linux Kernel Team
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Written/copyright 1994-2001 by Donald Becker.
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This software may be used and distributed according to the terms
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of the GNU General Public License, incorporated herein by reference.
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Please refer to Documentation/DocBook/tulip.{pdf,ps,html}
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for more information on this driver, or visit the project
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Web page at http://sourceforge.net/projects/tulip/
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*/
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/* Ported to RTnet by Wittawat Yamwong <wittawat@web.de> */
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#include "tulip.h"
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#include <linux/etherdevice.h>
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#include <linux/pci.h>
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int tulip_rx_copybreak;
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unsigned int tulip_max_interrupt_work;
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#ifdef CONFIG_NET_HW_FLOWCONTROL
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#define MIT_SIZE 15
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unsigned int mit_table[MIT_SIZE+1] =
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{
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/* CRS11 21143 hardware Mitigation Control Interrupt
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We use only RX mitigation we other techniques for
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TX intr. mitigation.
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31 Cycle Size (timer control)
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30:27 TX timer in 16 * Cycle size
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26:24 TX No pkts before Int.
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23:20 RX timer in Cycle size
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19:17 RX No pkts before Int.
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16 Continues Mode (CM)
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*/
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0x0, /* IM disabled */
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0x80150000, /* RX time = 1, RX pkts = 2, CM = 1 */
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0x80150000,
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0x80270000,
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0x80370000,
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0x80490000,
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0x80590000,
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0x80690000,
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0x807B0000,
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0x808B0000,
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0x809D0000,
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0x80AD0000,
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0x80BD0000,
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0x80CF0000,
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0x80DF0000,
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// 0x80FF0000 /* RX time = 16, RX pkts = 7, CM = 1 */
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0x80F10000 /* RX time = 16, RX pkts = 0, CM = 1 */
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};
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#endif
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int tulip_refill_rx(/*RTnet*/struct rtnet_device *rtdev)
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{
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struct tulip_private *tp = (struct tulip_private *)rtdev->priv;
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int entry;
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int refilled = 0;
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/* Refill the Rx ring buffers. */
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for (; tp->cur_rx - tp->dirty_rx > 0; tp->dirty_rx++) {
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entry = tp->dirty_rx % RX_RING_SIZE;
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if (tp->rx_buffers[entry].skb == NULL) {
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struct /*RTnet*/rtskb *skb;
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dma_addr_t mapping;
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skb = tp->rx_buffers[entry].skb = /*RTnet*/rtnetdev_alloc_rtskb(rtdev, PKT_BUF_SZ);
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if (skb == NULL)
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break;
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mapping = dma_map_single(&tp->pdev->dev, skb->tail,
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PKT_BUF_SZ, DMA_FROM_DEVICE);
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tp->rx_buffers[entry].mapping = mapping;
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tp->rx_ring[entry].buffer1 = cpu_to_le32(mapping);
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refilled++;
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}
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tp->rx_ring[entry].status = cpu_to_le32(DescOwned);
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}
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if(tp->chip_id == LC82C168) {
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if(((inl(rtdev->base_addr + CSR5)>>17)&0x07) == 4) {
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/* Rx stopped due to out of buffers,
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* restart it
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*/
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outl(0x01, rtdev->base_addr + CSR2);
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}
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}
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return refilled;
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}
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static int tulip_rx(/*RTnet*/struct rtnet_device *rtdev, nanosecs_abs_t *time_stamp)
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{
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struct tulip_private *tp = (struct tulip_private *)rtdev->priv;
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int entry = tp->cur_rx % RX_RING_SIZE;
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int rx_work_limit = tp->dirty_rx + RX_RING_SIZE - tp->cur_rx;
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int received = 0;
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if (tulip_debug > 4)
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/*RTnet*/rtdm_printk(KERN_DEBUG " In tulip_rx(), entry %d %8.8x.\n", entry,
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tp->rx_ring[entry].status);
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/* If we own the next entry, it is a new packet. Send it up. */
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while ( ! (tp->rx_ring[entry].status & cpu_to_le32(DescOwned))) {
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s32 status = le32_to_cpu(tp->rx_ring[entry].status);
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if (tulip_debug > 5)
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/*RTnet*/rtdm_printk(KERN_DEBUG "%s: In tulip_rx(), entry %d %8.8x.\n",
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rtdev->name, entry, status);
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if (--rx_work_limit < 0)
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break;
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if ((status & 0x38008300) != 0x0300) {
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if ((status & 0x38000300) != 0x0300) {
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/* Ingore earlier buffers. */
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if ((status & 0xffff) != 0x7fff) {
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if (tulip_debug > 1)
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/*RTnet*/rtdm_printk(KERN_WARNING "%s: Oversized Ethernet frame "
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"spanned multiple buffers, status %8.8x!\n",
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rtdev->name, status);
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tp->stats.rx_length_errors++;
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}
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} else if (status & RxDescFatalErr) {
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/* There was a fatal error. */
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if (tulip_debug > 2)
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/*RTnet*/rtdm_printk(KERN_DEBUG "%s: Receive error, Rx status %8.8x.\n",
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rtdev->name, status);
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tp->stats.rx_errors++; /* end of a packet.*/
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if (status & 0x0890) tp->stats.rx_length_errors++;
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if (status & 0x0004) tp->stats.rx_frame_errors++;
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if (status & 0x0002) tp->stats.rx_crc_errors++;
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if (status & 0x0001) tp->stats.rx_fifo_errors++;
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}
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} else {
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/* Omit the four octet CRC from the length. */
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short pkt_len = ((status >> 16) & 0x7ff) - 4;
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struct /*RTnet*/rtskb *skb;
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#ifndef final_version
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if (pkt_len > 1518) {
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/*RTnet*/rtdm_printk(KERN_WARNING "%s: Bogus packet size of %d (%#x).\n",
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rtdev->name, pkt_len, pkt_len);
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pkt_len = 1518;
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tp->stats.rx_length_errors++;
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}
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#endif
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{
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unsigned char *temp = /*RTnet*/rtskb_put(skb = tp->rx_buffers[entry].skb, pkt_len);
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#ifndef final_version
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if (tp->rx_buffers[entry].mapping !=
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le32_to_cpu(tp->rx_ring[entry].buffer1)) {
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/*RTnet*/rtdm_printk(KERN_ERR "%s: Internal fault: The skbuff addresses "
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"do not match in tulip_rx: %08x vs. %08llx ? / %p.\n",
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rtdev->name,
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le32_to_cpu(tp->rx_ring[entry].buffer1),
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(unsigned long long)tp->rx_buffers[entry].mapping,
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temp);/*RTnet*/
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}
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#endif
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dma_unmap_single(&tp->pdev->dev,
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tp->rx_buffers[entry].mapping,
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PKT_BUF_SZ, DMA_FROM_DEVICE);
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tp->rx_buffers[entry].skb = NULL;
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tp->rx_buffers[entry].mapping = 0;
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}
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skb->protocol = /*RTnet*/rt_eth_type_trans(skb, rtdev);
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skb->time_stamp = *time_stamp;
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/*RTnet*/rtnetif_rx(skb);
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tp->stats.rx_packets++;
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tp->stats.rx_bytes += pkt_len;
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}
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received++;
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entry = (++tp->cur_rx) % RX_RING_SIZE;
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}
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return received;
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}
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/* The interrupt handler does all of the Rx thread work and cleans up
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after the Tx thread. */
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int tulip_interrupt(rtdm_irq_t *irq_handle)
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{
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nanosecs_abs_t time_stamp = rtdm_clock_read();/*RTnet*/
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struct rtnet_device *rtdev =
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rtdm_irq_get_arg(irq_handle, struct rtnet_device);/*RTnet*/
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struct tulip_private *tp = (struct tulip_private *)rtdev->priv;
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long ioaddr = rtdev->base_addr;
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unsigned int csr5;
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int entry;
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int missed;
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int rx = 0;
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int tx = 0;
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int oi = 0;
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int maxrx = RX_RING_SIZE;
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int maxtx = TX_RING_SIZE;
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int maxoi = TX_RING_SIZE;
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unsigned int work_count = tulip_max_interrupt_work;
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/* Let's see whether the interrupt really is for us */
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csr5 = inl(ioaddr + CSR5);
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if ((csr5 & (NormalIntr|AbnormalIntr)) == 0) {
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rtdm_printk("%s: unexpected IRQ!\n",rtdev->name);
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return RTDM_IRQ_NONE;
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}
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tp->nir++;
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do {
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/* Acknowledge all of the current interrupt sources ASAP. */
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outl(csr5 & 0x0001ffff, ioaddr + CSR5);
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if (tulip_debug > 4)
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/*RTnet*/rtdm_printk(KERN_DEBUG "%s: interrupt csr5=%#8.8x new csr5=%#8.8x.\n",
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rtdev->name, csr5, inl(rtdev->base_addr + CSR5));
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if (csr5 & (RxIntr | RxNoBuf)) {
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rx += tulip_rx(rtdev, &time_stamp);
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tulip_refill_rx(rtdev);
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}
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if (csr5 & (TxNoBuf | TxDied | TxIntr | TimerInt)) {
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unsigned int dirty_tx;
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rtdm_lock_get(&tp->lock);
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for (dirty_tx = tp->dirty_tx; tp->cur_tx - dirty_tx > 0;
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dirty_tx++) {
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int entry = dirty_tx % TX_RING_SIZE;
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int status = le32_to_cpu(tp->tx_ring[entry].status);
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if (status < 0)
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break; /* It still has not been Txed */
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/* Check for Rx filter setup frames. */
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if (tp->tx_buffers[entry].skb == NULL) {
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/* test because dummy frames not mapped */
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if (tp->tx_buffers[entry].mapping)
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dma_unmap_single(&tp->pdev->dev,
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tp->tx_buffers[entry].mapping,
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sizeof(tp->setup_frame),
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DMA_TO_DEVICE);
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continue;
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}
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if (status & 0x8000) {
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/* There was an major error, log it. */
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#ifndef final_version
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if (tulip_debug > 1)
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/*RTnet*/rtdm_printk(KERN_DEBUG "%s: Transmit error, Tx status %8.8x.\n",
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rtdev->name, status);
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#endif
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tp->stats.tx_errors++;
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if (status & 0x4104) tp->stats.tx_aborted_errors++;
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if (status & 0x0C00) tp->stats.tx_carrier_errors++;
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if (status & 0x0200) tp->stats.tx_window_errors++;
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if (status & 0x0002) tp->stats.tx_fifo_errors++;
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if ((status & 0x0080) && tp->full_duplex == 0)
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tp->stats.tx_heartbeat_errors++;
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} else {
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tp->stats.tx_bytes +=
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tp->tx_buffers[entry].skb->len;
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tp->stats.collisions += (status >> 3) & 15;
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tp->stats.tx_packets++;
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}
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dma_unmap_single(&tp->pdev->dev,
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tp->tx_buffers[entry].mapping,
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tp->tx_buffers[entry].skb->len,
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DMA_TO_DEVICE);
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/* Free the original skb. */
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/*RTnet*/dev_kfree_rtskb(tp->tx_buffers[entry].skb);
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tp->tx_buffers[entry].skb = NULL;
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tp->tx_buffers[entry].mapping = 0;
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tx++;
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rtnetif_tx(rtdev);
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}
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#ifndef final_version
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if (tp->cur_tx - dirty_tx > TX_RING_SIZE) {
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/*RTnet*/rtdm_printk(KERN_ERR "%s: Out-of-sync dirty pointer, %d vs. %d.\n",
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rtdev->name, dirty_tx, tp->cur_tx);
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dirty_tx += TX_RING_SIZE;
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}
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#endif
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if (tp->cur_tx - dirty_tx < TX_RING_SIZE - 2)
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/*RTnet*/rtnetif_wake_queue(rtdev);
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tp->dirty_tx = dirty_tx;
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if (csr5 & TxDied) {
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if (tulip_debug > 2)
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/*RTnet*/rtdm_printk(KERN_WARNING "%s: The transmitter stopped."
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" CSR5 is %x, CSR6 %x, new CSR6 %x.\n",
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rtdev->name, csr5, inl(ioaddr + CSR6), tp->csr6);
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tulip_restart_rxtx(tp);
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}
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rtdm_lock_put(&tp->lock);
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}
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/* Log errors. */
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if (csr5 & AbnormalIntr) { /* Abnormal error summary bit. */
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if (csr5 == 0xffffffff)
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break;
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/*RTnet*/rtdm_printk(KERN_ERR "%s: Error detected, "
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"device may not work any more (csr5=%08x)!\n", rtdev->name, csr5);
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/* Clear all error sources, included undocumented ones! */
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outl(0x0800f7ba, ioaddr + CSR5);
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oi++;
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}
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if (csr5 & TimerInt) {
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if (tulip_debug > 2)
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/*RTnet*/rtdm_printk(KERN_ERR "%s: Re-enabling interrupts, %8.8x.\n",
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rtdev->name, csr5);
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outl(tulip_tbl[tp->chip_id].valid_intrs, ioaddr + CSR7);
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tp->ttimer = 0;
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oi++;
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}
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if (tx > maxtx || rx > maxrx || oi > maxoi) {
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if (tulip_debug > 1)
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/*RTnet*/rtdm_printk(KERN_WARNING "%s: Too much work during an interrupt, "
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"csr5=0x%8.8x. (%lu) (%d,%d,%d)\n", rtdev->name, csr5, tp->nir, tx, rx, oi);
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/* Acknowledge all interrupt sources. */
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outl(0x8001ffff, ioaddr + CSR5);
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if (tp->flags & HAS_INTR_MITIGATION) {
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/* Josip Loncaric at ICASE did extensive experimentation
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to develop a good interrupt mitigation setting.*/
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outl(0x8b240000, ioaddr + CSR11);
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} else if (tp->chip_id == LC82C168) {
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/* the LC82C168 doesn't have a hw timer.*/
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outl(0x00, ioaddr + CSR7);
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} else {
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/* Mask all interrupting sources, set timer to
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re-enable. */
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}
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break;
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}
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work_count--;
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if (work_count == 0)
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break;
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csr5 = inl(ioaddr + CSR5);
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} while ((csr5 & (NormalIntr|AbnormalIntr)) != 0);
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tulip_refill_rx(rtdev);
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/* check if the card is in suspend mode */
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entry = tp->dirty_rx % RX_RING_SIZE;
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if (tp->rx_buffers[entry].skb == NULL) {
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if (tulip_debug > 1)
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/*RTnet*/rtdm_printk(KERN_WARNING "%s: in rx suspend mode: (%lu) (tp->cur_rx = %u, ttimer = %d, rx = %d) go/stay in suspend mode\n", rtdev->name, tp->nir, tp->cur_rx, tp->ttimer, rx);
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if (tp->chip_id == LC82C168)
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outl(0x00, ioaddr + CSR7);
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else {
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if (tp->ttimer == 0 || (inl(ioaddr + CSR11) & 0xffff) == 0) {
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if (tulip_debug > 1)
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/*RTnet*/rtdm_printk(KERN_WARNING "%s: in rx suspend mode: (%lu) set timer\n", rtdev->name, tp->nir);
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outl(tulip_tbl[tp->chip_id].valid_intrs | TimerInt,
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ioaddr + CSR7);
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outl(TimerInt, ioaddr + CSR5);
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outl(12, ioaddr + CSR11);
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tp->ttimer = 1;
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}
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}
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}
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if ((missed = inl(ioaddr + CSR8) & 0x1ffff)) {
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tp->stats.rx_dropped += missed & 0x10000 ? 0x10000 : missed;
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}
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if (tulip_debug > 4)
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/*RTnet*/rtdm_printk(KERN_DEBUG "%s: exiting interrupt, csr5=%#4.4x.\n",
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rtdev->name, inl(ioaddr + CSR5));
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if (rx)
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rt_mark_stack_mgr(rtdev);
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return RTDM_IRQ_HANDLED;
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}
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