patch-2.0.34 linux/drivers/net/lance32.c
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- Lines: 850
- Date:
Wed Dec 31 16:00:00 1969
- Orig file:
v2.0.33/linux/drivers/net/lance32.c
- Orig date:
Mon Aug 4 12:11:05 1997
diff -u --recursive --new-file v2.0.33/linux/drivers/net/lance32.c linux/drivers/net/lance32.c
@@ -1,849 +0,0 @@
-/* lance32.c: An AMD PCnet32 ethernet driver for linux. */
-/*
- * Copyright 1996 Thomas Bogendoerfer
- *
- * Derived from the lance driver written 1993,1994,1995 by Donald Becker.
- *
- * Copyright 1993 United States Government as represented by the
- * Director, National Security Agency.
- *
- * This software may be used and distributed according to the terms
- * of the GNU Public License, incorporated herein by reference.
- *
- * This driver is for PCnet32 and PCnetPCI based ethercards
- */
-
-static const char *version = "lance32.c:v0.10 28.4.96 tsbogend@bigbug.franken.de\n";
-
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/string.h>
-#include <linux/ptrace.h>
-#include <linux/errno.h>
-#include <linux/ioport.h>
-#include <linux/malloc.h>
-#include <linux/interrupt.h>
-#include <linux/pci.h>
-#include <linux/bios32.h>
-#include <asm/bitops.h>
-#include <asm/io.h>
-#include <asm/dma.h>
-
-#include <linux/netdevice.h>
-#include <linux/etherdevice.h>
-#include <linux/skbuff.h>
-
-#ifdef LANCE32_DEBUG
-int lance32_debug = LANCE32_DEBUG;
-#else
-int lance32_debug = 1;
-#endif
-
-/*
- * Theory of Operation
- *
- * This driver uses the same software structure as the normal lance
- * driver. So look for a verbose description in lance.c. The differences
- * to the normal lance driver is the use of the 32bit mode of PCnet32
- * and PCnetPCI chips. Because these chips are 32bit chips, there is no
- * 16MB limitation and we don't need bounce buffers.
- */
-
-/*
- * History:
- * v0.01: Initial version
- * only tested on Alpha Noname Board
- * v0.02: changed IRQ handling for new interrupt scheme (dev_id)
- * tested on a ASUS SP3G
- * v0.10: fixed a odd problem with the 79C794 in a Compaq Deskpro XL
- * looks like the 974 doesn't like stopping and restarting in a
- * short period of time; now we do a reinit of the lance; the
- * bug was triggered by doing ifconfig eth0 <ip> broadcast <addr>
- * and hangs the machine (thanks to Klaus Liedl for debugging)
- */
-
-
-/*
- * Set the number of Tx and Rx buffers, using Log_2(# buffers).
- * Reasonable default values are 4 Tx buffers, and 16 Rx buffers.
- * That translates to 2 (4 == 2^^2) and 4 (16 == 2^^4).
- */
-#ifndef LANCE_LOG_TX_BUFFERS
-#define LANCE_LOG_TX_BUFFERS 4
-#define LANCE_LOG_RX_BUFFERS 4
-#endif
-
-#define TX_RING_SIZE (1 << (LANCE_LOG_TX_BUFFERS))
-#define TX_RING_MOD_MASK (TX_RING_SIZE - 1)
-#define TX_RING_LEN_BITS ((LANCE_LOG_TX_BUFFERS) << 12)
-
-#define RX_RING_SIZE (1 << (LANCE_LOG_RX_BUFFERS))
-#define RX_RING_MOD_MASK (RX_RING_SIZE - 1)
-#define RX_RING_LEN_BITS ((LANCE_LOG_RX_BUFFERS) << 4)
-
-#define PKT_BUF_SZ 1544
-
-/* Offsets from base I/O address. */
-#define LANCE_DATA 0x10
-#define LANCE_ADDR 0x12
-#define LANCE_RESET 0x14
-#define LANCE_BUS_IF 0x16
-#define LANCE_TOTAL_SIZE 0x18
-
-/* The LANCE Rx and Tx ring descriptors. */
-struct lance32_rx_head {
- u32 base;
- s16 buf_length;
- s16 status;
- u32 msg_length;
- u32 reserved;
-};
-
-struct lance32_tx_head {
- u32 base;
- s16 length;
- s16 status;
- u32 misc;
- u32 reserved;
-};
-
-
-/* The LANCE 32-Bit initialization block, described in databook. */
-struct lance32_init_block {
- u16 mode;
- u16 tlen_rlen;
- u8 phys_addr[6];
- u16 reserved;
- u32 filter[2];
- /* Receive and transmit ring base, along with extra bits. */
- u32 rx_ring;
- u32 tx_ring;
-};
-
-struct lance32_private {
- /* The Tx and Rx ring entries must be aligned on 16-byte boundaries in 32bit mode. */
- struct lance32_rx_head rx_ring[RX_RING_SIZE];
- struct lance32_tx_head tx_ring[TX_RING_SIZE];
- struct lance32_init_block init_block;
- const char *name;
- /* The saved address of a sent-in-place packet/buffer, for skfree(). */
- struct sk_buff* tx_skbuff[TX_RING_SIZE];
- unsigned long rx_buffs; /* Address of Rx and Tx buffers. */
- int cur_rx, cur_tx; /* The next free ring entry */
- int dirty_rx, dirty_tx; /* The ring entries to be free()ed. */
- int dma;
- struct enet_statistics stats;
- char tx_full;
- unsigned long lock;
-};
-
-static int lance32_open(struct device *dev);
-static void lance32_init_ring(struct device *dev);
-static int lance32_start_xmit(struct sk_buff *skb, struct device *dev);
-static int lance32_rx(struct device *dev);
-static void lance32_interrupt(int irq, void *dev_id, struct pt_regs *regs);
-static int lance32_close(struct device *dev);
-static struct enet_statistics *lance32_get_stats(struct device *dev);
-static void lance32_set_multicast_list(struct device *dev);
-
-
-
-/* lance32_probe1 */
-void lance32_probe1(struct device *dev, char *chipname, int pci_irq_line)
-{
- struct lance32_private *lp;
- int ioaddr = dev->base_addr;
- short dma_channels; /* Mark spuriously-busy DMA channels */
- int i;
-
- /* Make certain the data structures used by the LANCE are 16byte aligned and DMAble. */
- lp = (struct lance32_private *) (((unsigned long)kmalloc(sizeof(*lp)+15, GFP_DMA | GFP_KERNEL)+15) & ~15);
-
- memset(lp, 0, sizeof(*lp));
- dev->priv = lp;
- lp->name = chipname;
- lp->rx_buffs = (unsigned long) kmalloc(PKT_BUF_SZ*RX_RING_SIZE, GFP_DMA | GFP_KERNEL);
-
- lp->init_block.mode = 0x0003; /* Disable Rx and Tx. */
- lp->init_block.tlen_rlen = TX_RING_LEN_BITS | RX_RING_LEN_BITS;
- for (i = 0; i < 6; i++)
- lp->init_block.phys_addr[i] = dev->dev_addr[i];
- lp->init_block.filter[0] = 0x00000000;
- lp->init_block.filter[1] = 0x00000000;
- lp->init_block.rx_ring = (u32)virt_to_bus(lp->rx_ring);
- lp->init_block.tx_ring = (u32)virt_to_bus(lp->tx_ring);
-
- /* switch lance to 32bit mode */
- outw(0x0014, ioaddr+LANCE_ADDR);
- outw(0x0002, ioaddr+LANCE_BUS_IF);
-
- outw(0x0001, ioaddr+LANCE_ADDR);
- inw(ioaddr+LANCE_ADDR);
- outw((short) (u32) virt_to_bus(&lp->init_block), ioaddr+LANCE_DATA);
- outw(0x0002, ioaddr+LANCE_ADDR);
- inw(ioaddr+LANCE_ADDR);
- outw(((u32)virt_to_bus(&lp->init_block)) >> 16, ioaddr+LANCE_DATA);
- outw(0x0000, ioaddr+LANCE_ADDR);
- inw(ioaddr+LANCE_ADDR);
-
- if (pci_irq_line) {
- dev->dma = 4; /* Native bus-master, no DMA channel needed. */
- dev->irq = pci_irq_line;
- } else {
- /* The DMA channel may be passed in PARAM1. */
- if (dev->mem_start & 0x07)
- dev->dma = dev->mem_start & 0x07;
- }
-
- if (dev->dma == 0) {
- /* Read the DMA channel status register, so that we can avoid
- stuck DMA channels in the DMA detection below. */
- dma_channels = ((inb(DMA1_STAT_REG) >> 4) & 0x0f) |
- (inb(DMA2_STAT_REG) & 0xf0);
- }
- if (dev->irq >= 2)
- printk(" assigned IRQ %d", dev->irq);
- else {
- /* To auto-IRQ we enable the initialization-done and DMA error
- interrupts. For ISA boards we get a DMA error, but VLB and PCI
- boards will work. */
- autoirq_setup(0);
-
- /* Trigger an initialization just for the interrupt. */
- outw(0x0041, ioaddr+LANCE_DATA);
-
- dev->irq = autoirq_report(1);
- if (dev->irq)
- printk(", probed IRQ %d", dev->irq);
- else {
- printk(", failed to detect IRQ line.\n");
- return;
- }
-
- /* Check for the initialization done bit, 0x0100, which means
- that we don't need a DMA channel. */
- if (inw(ioaddr+LANCE_DATA) & 0x0100)
- dev->dma = 4;
- }
-
- if (dev->dma == 4) {
- printk(", no DMA needed.\n");
- } else if (dev->dma) {
- if (request_dma(dev->dma, chipname)) {
- printk("DMA %d allocation failed.\n", dev->dma);
- return;
- } else
- printk(", assigned DMA %d.\n", dev->dma);
- } else { /* OK, we have to auto-DMA. */
- for (i = 0; i < 4; i++) {
- static const char dmas[] = { 5, 6, 7, 3 };
- int dma = dmas[i];
- int boguscnt;
-
- /* Don't enable a permanently busy DMA channel, or the machine
- will hang. */
- if (test_bit(dma, &dma_channels))
- continue;
- outw(0x7f04, ioaddr+LANCE_DATA); /* Clear the memory error bits. */
- if (request_dma(dma, chipname))
- continue;
- set_dma_mode(dma, DMA_MODE_CASCADE);
- enable_dma(dma);
-
- /* Trigger an initialization. */
- outw(0x0001, ioaddr+LANCE_DATA);
- for (boguscnt = 100; boguscnt > 0; --boguscnt)
- if (inw(ioaddr+LANCE_DATA) & 0x0900)
- break;
- if (inw(ioaddr+LANCE_DATA) & 0x0100) {
- dev->dma = dma;
- printk(", DMA %d.\n", dev->dma);
- break;
- } else {
- disable_dma(dma);
- free_dma(dma);
- }
- }
- if (i == 4) { /* Failure: bail. */
- printk("DMA detection failed.\n");
- return;
- }
- }
-
- outw(0x0002, ioaddr+LANCE_ADDR);
- outw(0x0002, ioaddr+LANCE_BUS_IF);
-
- /* Reset the LANCE - this should prevent any more interrupts from arriving */
- inw(ioaddr+LANCE_RESET);
-
- if (lance32_debug > 0)
- printk(version);
-
- /* The LANCE-specific entries in the device structure. */
- dev->open = &lance32_open;
- dev->hard_start_xmit = &lance32_start_xmit;
- dev->stop = &lance32_close;
- dev->get_stats = &lance32_get_stats;
- dev->set_multicast_list = &lance32_set_multicast_list;
-
- return;
-}
-
-
-static int
-lance32_open(struct device *dev)
-{
- struct lance32_private *lp = (struct lance32_private *)dev->priv;
- int ioaddr = dev->base_addr;
- int i;
-
- if (dev->irq == 0 ||
- request_irq(dev->irq, &lance32_interrupt, 0, lp->name, (void *)dev)) {
- return -EAGAIN;
- }
-
- irq2dev_map[dev->irq] = dev;
-
- /* Reset the LANCE */
- inw(ioaddr+LANCE_RESET);
-
- /* switch lance to 32bit mode */
- outw(0x0014, ioaddr+LANCE_ADDR);
- outw(0x0002, ioaddr+LANCE_BUS_IF);
-
- /* The DMA controller is used as a no-operation slave, "cascade mode". */
- if (dev->dma != 4) {
- enable_dma(dev->dma);
- set_dma_mode(dev->dma, DMA_MODE_CASCADE);
- }
-
- /* Turn on auto-select of media (AUI, BNC). */
- outw(0x0002, ioaddr+LANCE_ADDR);
- outw(0x0002, ioaddr+LANCE_BUS_IF);
-
- if (lance32_debug > 1)
- printk("%s: lance32_open() irq %d dma %d tx/rx rings %#x/%#x init %#x.\n",
- dev->name, dev->irq, dev->dma,
- (u32) virt_to_bus(lp->tx_ring),
- (u32) virt_to_bus(lp->rx_ring),
- (u32) virt_to_bus(&lp->init_block));
-
- lp->init_block.mode = 0x0000;
- lp->init_block.filter[0] = 0x00000000;
- lp->init_block.filter[1] = 0x00000000;
- lance32_init_ring(dev);
-
- /* Re-initialize the LANCE, and start it when done. */
- outw(0x0001, ioaddr+LANCE_ADDR);
- outw((short) (u32) virt_to_bus(&lp->init_block), ioaddr+LANCE_DATA);
- outw(0x0002, ioaddr+LANCE_ADDR);
- outw(((u32)virt_to_bus(&lp->init_block)) >> 16, ioaddr+LANCE_DATA);
-
- outw(0x0004, ioaddr+LANCE_ADDR);
- outw(0x0915, ioaddr+LANCE_DATA);
-
- outw(0x0000, ioaddr+LANCE_ADDR);
- outw(0x0001, ioaddr+LANCE_DATA);
-
- dev->tbusy = 0;
- dev->interrupt = 0;
- dev->start = 1;
- i = 0;
- while (i++ < 100)
- if (inw(ioaddr+LANCE_DATA) & 0x0100)
- break;
- /*
- * We used to clear the InitDone bit, 0x0100, here but Mark Stockton
- * reports that doing so triggers a bug in the '974.
- */
- outw(0x0042, ioaddr+LANCE_DATA);
-
- if (lance32_debug > 2)
- printk("%s: LANCE32 open after %d ticks, init block %#x csr0 %4.4x.\n",
- dev->name, i, (u32) virt_to_bus(&lp->init_block), inw(ioaddr+LANCE_DATA));
-
- return 0; /* Always succeed */
-}
-
-/*
- * The LANCE has been halted for one reason or another (busmaster memory
- * arbitration error, Tx FIFO underflow, driver stopped it to reconfigure,
- * etc.). Modern LANCE variants always reload their ring-buffer
- * configuration when restarted, so we must reinitialize our ring
- * context before restarting. As part of this reinitialization,
- * find all packets still on the Tx ring and pretend that they had been
- * sent (in effect, drop the packets on the floor) - the higher-level
- * protocols will time out and retransmit. It'd be better to shuffle
- * these skbs to a temp list and then actually re-Tx them after
- * restarting the chip, but I'm too lazy to do so right now. dplatt@3do.com
- */
-
-static void
-lance32_purge_tx_ring(struct device *dev)
-{
- struct lance32_private *lp = (struct lance32_private *)dev->priv;
- int i;
-
- for (i = 0; i < TX_RING_SIZE; i++) {
- if (lp->tx_skbuff[i]) {
- dev_kfree_skb(lp->tx_skbuff[i],FREE_WRITE);
- lp->tx_skbuff[i] = NULL;
- }
- }
-}
-
-
-/* Initialize the LANCE Rx and Tx rings. */
-static void
-lance32_init_ring(struct device *dev)
-{
- struct lance32_private *lp = (struct lance32_private *)dev->priv;
- int i;
-
- lp->lock = 0, lp->tx_full = 0;
- lp->cur_rx = lp->cur_tx = 0;
- lp->dirty_rx = lp->dirty_tx = 0;
-
- for (i = 0; i < RX_RING_SIZE; i++) {
- lp->rx_ring[i].base = (u32)virt_to_bus((char *)lp->rx_buffs + i*PKT_BUF_SZ);
- lp->rx_ring[i].buf_length = -PKT_BUF_SZ;
- lp->rx_ring[i].status = 0x8000;
- }
- /* The Tx buffer address is filled in as needed, but we do need to clear
- the upper ownership bit. */
- for (i = 0; i < TX_RING_SIZE; i++) {
- lp->tx_ring[i].base = 0;
- lp->tx_ring[i].status = 0;
- }
-
- lp->init_block.tlen_rlen = TX_RING_LEN_BITS | RX_RING_LEN_BITS;
- for (i = 0; i < 6; i++)
- lp->init_block.phys_addr[i] = dev->dev_addr[i];
- lp->init_block.rx_ring = (u32)virt_to_bus(lp->rx_ring);
- lp->init_block.tx_ring = (u32)virt_to_bus(lp->tx_ring);
-}
-
-static void
-lance32_restart(struct device *dev, unsigned int csr0_bits, int must_reinit)
-{
- int i;
- int ioaddr = dev->base_addr;
-
- lance32_purge_tx_ring(dev);
- lance32_init_ring(dev);
-
- outw(0x0000, ioaddr + LANCE_ADDR);
- /* ReInit Ring */
- outw(0x0001, ioaddr + LANCE_DATA);
- i = 0;
- while (i++ < 100)
- if (inw(ioaddr+LANCE_DATA) & 0x0100)
- break;
-
- outw(csr0_bits, ioaddr + LANCE_DATA);
-}
-
-static int
-lance32_start_xmit(struct sk_buff *skb, struct device *dev)
-{
- struct lance32_private *lp = (struct lance32_private *)dev->priv;
- int ioaddr = dev->base_addr;
- int entry;
- unsigned long flags;
-
- /* Transmitter timeout, serious problems. */
- if (dev->tbusy) {
- int tickssofar = jiffies - dev->trans_start;
- if (tickssofar < 60) /* It can take this long to run through the 16 retries */
- return 1;
- outw(0, ioaddr+LANCE_ADDR);
- printk("%s: transmit timed out, status %4.4x, resetting.\n",
- dev->name, inw(ioaddr+LANCE_DATA));
- outw(0x0004, ioaddr+LANCE_DATA);
- lp->stats.tx_errors++;
-#ifndef final_version
- {
- int i;
- printk(" Ring data dump: dirty_tx %d cur_tx %d%s cur_rx %d.",
- lp->dirty_tx, lp->cur_tx, lp->tx_full ? " (full)" : "",
- lp->cur_rx);
- for (i = 0 ; i < RX_RING_SIZE; i++)
- printk("%s %08x %04x %04x", i & 0x3 ? "" : "\n ",
- lp->rx_ring[i].base, -lp->rx_ring[i].buf_length,
- lp->rx_ring[i].msg_length);
- for (i = 0 ; i < TX_RING_SIZE; i++)
- printk("%s %08x %04x %04x %08x ", i & 0x1 ? "" : "\n ",
- lp->tx_ring[i].base, -lp->tx_ring[i].length,
- lp->tx_ring[i].status,
- lp->tx_ring[i].misc);
- printk("\n");
- }
-#endif
- lance32_restart(dev, 0x0042, 1);
-
- dev->tbusy=0;
- dev->trans_start = jiffies;
- dev_kfree_skb(skb, FREE_WRITE);
- return 0;
- }
-
- if (skb == NULL) {
- dev_tint(dev);
- return 0;
- }
-
- if (skb->len <= 0)
- return 0;
-
- if (lance32_debug > 3) {
- outw(0x0000, ioaddr+LANCE_ADDR);
- printk("%s: lance32_start_xmit() called, csr0 %4.4x.\n", dev->name,
- inw(ioaddr+LANCE_DATA));
- outw(0x0000, ioaddr+LANCE_DATA);
- }
-
- /* Block a timer-based transmit from overlapping. This could better be
- done with atomic_swap(1, dev->tbusy), but set_bit() works as well. */
- if (set_bit(0, (void*)&dev->tbusy) != 0) {
- printk("%s: Transmitter access conflict.\n", dev->name);
- return 1;
- }
-
- if (set_bit(0, (void*)&lp->lock) != 0) {
- if (lance32_debug > 0)
- printk("%s: tx queue lock!.\n", dev->name);
- /* don't clear dev->tbusy flag. */
- return 1;
- }
-
- /* Fill in a Tx ring entry */
-
- /* Mask to ring buffer boundary. */
- entry = lp->cur_tx & TX_RING_MOD_MASK;
-
- /* Caution: the write order is important here, set the base address
- with the "ownership" bits last. */
-
- lp->tx_ring[entry].length = -skb->len;
-
- lp->tx_ring[entry].misc = 0x00000000;
-
- lp->tx_skbuff[entry] = skb;
- lp->tx_ring[entry].base = (u32)virt_to_bus(skb->data);
- lp->tx_ring[entry].status = 0x8300;
-
- lp->cur_tx++;
-
- /* Trigger an immediate send poll. */
- outw(0x0000, ioaddr+LANCE_ADDR);
- outw(0x0048, ioaddr+LANCE_DATA);
-
- dev->trans_start = jiffies;
-
- save_flags(flags);
- cli();
- lp->lock = 0;
- if (lp->tx_ring[(entry+1) & TX_RING_MOD_MASK].base == 0)
- dev->tbusy=0;
- else
- lp->tx_full = 1;
- restore_flags(flags);
-
- return 0;
-}
-
-/* The LANCE32 interrupt handler. */
-static void
-lance32_interrupt(int irq, void *dev_id, struct pt_regs * regs)
-{
- struct device *dev = (struct device *)dev_id;
- struct lance32_private *lp;
- int csr0, ioaddr, boguscnt=10;
- int must_restart;
-
- if (dev == NULL) {
- printk ("lance32_interrupt(): irq %d for unknown device.\n", irq);
- return;
- }
-
- ioaddr = dev->base_addr;
- lp = (struct lance32_private *)dev->priv;
- if (dev->interrupt)
- printk("%s: Re-entering the interrupt handler.\n", dev->name);
-
- dev->interrupt = 1;
-
- outw(0x00, dev->base_addr + LANCE_ADDR);
- while ((csr0 = inw(dev->base_addr + LANCE_DATA)) & 0x8600
- && --boguscnt >= 0) {
- /* Acknowledge all of the current interrupt sources ASAP. */
- outw(csr0 & ~0x004f, dev->base_addr + LANCE_DATA);
-
- must_restart = 0;
-
- if (lance32_debug > 5)
- printk("%s: interrupt csr0=%#2.2x new csr=%#2.2x.\n",
- dev->name, csr0, inw(dev->base_addr + LANCE_DATA));
-
- if (csr0 & 0x0400) /* Rx interrupt */
- lance32_rx(dev);
-
- if (csr0 & 0x0200) { /* Tx-done interrupt */
- int dirty_tx = lp->dirty_tx;
-
- while (dirty_tx < lp->cur_tx) {
- int entry = dirty_tx & TX_RING_MOD_MASK;
- int status = lp->tx_ring[entry].status;
-
- if (status < 0)
- break; /* It still hasn't been Txed */
-
- lp->tx_ring[entry].base = 0;
-
- if (status & 0x4000) {
- /* There was an major error, log it. */
- int err_status = lp->tx_ring[entry].misc;
- lp->stats.tx_errors++;
- if (err_status & 0x04000000) lp->stats.tx_aborted_errors++;
- if (err_status & 0x08000000) lp->stats.tx_carrier_errors++;
- if (err_status & 0x10000000) lp->stats.tx_window_errors++;
- if (err_status & 0x40000000) {
- /* Ackk! On FIFO errors the Tx unit is turned off! */
- lp->stats.tx_fifo_errors++;
- /* Remove this verbosity later! */
- printk("%s: Tx FIFO error! Status %4.4x.\n",
- dev->name, csr0);
- /* Restart the chip. */
- must_restart = 1;
- }
- } else {
- if (status & 0x1800)
- lp->stats.collisions++;
- lp->stats.tx_packets++;
- }
-
- /* We must free the original skb */
- if (lp->tx_skbuff[entry]) {
- dev_kfree_skb(lp->tx_skbuff[entry],FREE_WRITE);
- lp->tx_skbuff[entry] = 0;
- }
- dirty_tx++;
- }
-
-#ifndef final_version
- if (lp->cur_tx - dirty_tx >= TX_RING_SIZE) {
- printk("out-of-sync dirty pointer, %d vs. %d, full=%d.\n",
- dirty_tx, lp->cur_tx, lp->tx_full);
- dirty_tx += TX_RING_SIZE;
- }
-#endif
-
- if (dev->tbusy)
- dev->trans_start = jiffies; /* We are just starting the next transmit */
-
- if (lp->tx_full && dev->tbusy
- && dirty_tx > lp->cur_tx - TX_RING_SIZE + 2) {
- /* The ring is no longer full, clear tbusy. */
- lp->tx_full = 0;
- dev->tbusy = 0;
- mark_bh(NET_BH);
- }
-
- lp->dirty_tx = dirty_tx;
- }
-
- /* Log misc errors. */
- if (csr0 & 0x4000) lp->stats.tx_errors++; /* Tx babble. */
- if (csr0 & 0x1000) lp->stats.rx_errors++; /* Missed a Rx frame. */
- if (csr0 & 0x0800) {
- printk("%s: Bus master arbitration failure, status %4.4x.\n",
- dev->name, csr0);
- /* Restart the chip. */
- must_restart = 1;
- }
-
- if (must_restart) {
- /* stop the chip to clear the error condition, then restart */
- outw(0x0000, dev->base_addr + LANCE_ADDR);
- outw(0x0004, dev->base_addr + LANCE_DATA);
- lance32_restart(dev, 0x0002, 0);
- }
- }
-
- /* Clear any other interrupt, and set interrupt enable. */
- outw(0x0000, dev->base_addr + LANCE_ADDR);
- outw(0x7940, dev->base_addr + LANCE_DATA);
-
- if (lance32_debug > 4)
- printk("%s: exiting interrupt, csr%d=%#4.4x.\n",
- dev->name, inw(ioaddr + LANCE_ADDR),
- inw(dev->base_addr + LANCE_DATA));
-
- dev->interrupt = 0;
- return;
-}
-
-static int
-lance32_rx(struct device *dev)
-{
- struct lance32_private *lp = (struct lance32_private *)dev->priv;
- int entry = lp->cur_rx & RX_RING_MOD_MASK;
- int i;
-
- /* If we own the next entry, it's a new packet. Send it up. */
- while (lp->rx_ring[entry].status >= 0) {
- int status = lp->rx_ring[entry].status >> 8;
-
- if (status != 0x03) { /* There was an error. */
- /* There is a tricky error noted by John Murphy,
- <murf@perftech.com> to Russ Nelson: Even with full-sized
- buffers it's possible for a jabber packet to use two
- buffers, with only the last correctly noting the error. */
- if (status & 0x01) /* Only count a general error at the */
- lp->stats.rx_errors++; /* end of a packet.*/
- if (status & 0x20) lp->stats.rx_frame_errors++;
- if (status & 0x10) lp->stats.rx_over_errors++;
- if (status & 0x08) lp->stats.rx_crc_errors++;
- if (status & 0x04) lp->stats.rx_fifo_errors++;
- lp->rx_ring[entry].status &= 0x03ff;
- }
- else
- {
- /* Malloc up new buffer, compatible with net-2e. */
- short pkt_len = (lp->rx_ring[entry].msg_length & 0xfff)-4;
- struct sk_buff *skb;
-
- if(pkt_len<60)
- {
- printk("%s: Runt packet!\n",dev->name);
- lp->stats.rx_errors++;
- }
- else
- {
- skb = dev_alloc_skb(pkt_len+2);
- if (skb == NULL)
- {
- printk("%s: Memory squeeze, deferring packet.\n", dev->name);
- for (i=0; i < RX_RING_SIZE; i++)
- if (lp->rx_ring[(entry+i) & RX_RING_MOD_MASK].status < 0)
- break;
-
- if (i > RX_RING_SIZE -2)
- {
- lp->stats.rx_dropped++;
- lp->rx_ring[entry].status |= 0x8000;
- lp->cur_rx++;
- }
- break;
- }
- skb->dev = dev;
- skb_reserve(skb,2); /* 16 byte align */
- skb_put(skb,pkt_len); /* Make room */
- eth_copy_and_sum(skb,
- (unsigned char *)bus_to_virt(lp->rx_ring[entry].base),
- pkt_len,0);
- skb->protocol=eth_type_trans(skb,dev);
- netif_rx(skb);
- lp->stats.rx_packets++;
- }
- }
- /* The docs say that the buffer length isn't touched, but Andrew Boyd
- of QNX reports that some revs of the 79C965 clear it. */
- lp->rx_ring[entry].buf_length = -PKT_BUF_SZ;
- lp->rx_ring[entry].status |= 0x8000;
- entry = (++lp->cur_rx) & RX_RING_MOD_MASK;
- }
-
- /* We should check that at least two ring entries are free. If not,
- we should free one and mark stats->rx_dropped++. */
-
- return 0;
-}
-
-static int
-lance32_close(struct device *dev)
-{
- int ioaddr = dev->base_addr;
- struct lance32_private *lp = (struct lance32_private *)dev->priv;
-
- dev->start = 0;
- dev->tbusy = 1;
-
- outw(112, ioaddr+LANCE_ADDR);
- lp->stats.rx_missed_errors = inw(ioaddr+LANCE_DATA);
-
- outw(0, ioaddr+LANCE_ADDR);
-
- if (lance32_debug > 1)
- printk("%s: Shutting down ethercard, status was %2.2x.\n",
- dev->name, inw(ioaddr+LANCE_DATA));
-
- /* We stop the LANCE here -- it occasionally polls
- memory if we don't. */
- outw(0x0004, ioaddr+LANCE_DATA);
-
- if (dev->dma != 4)
- disable_dma(dev->dma);
-
- free_irq(dev->irq, dev);
-
- irq2dev_map[dev->irq] = 0;
-
- return 0;
-}
-
-static struct enet_statistics *
-lance32_get_stats(struct device *dev)
-{
- struct lance32_private *lp = (struct lance32_private *)dev->priv;
- int ioaddr = dev->base_addr;
- unsigned short saved_addr;
- unsigned long flags;
-
- save_flags(flags);
- cli();
- saved_addr = inw(ioaddr+LANCE_ADDR);
- outw(112, ioaddr+LANCE_ADDR);
- lp->stats.rx_missed_errors = inw(ioaddr+LANCE_DATA);
- outw(saved_addr, ioaddr+LANCE_ADDR);
- restore_flags(flags);
-
- return &lp->stats;
-}
-
-/* Set or clear the multicast filter for this adaptor.
- */
-
-static void lance32_set_multicast_list(struct device *dev)
-{
- int ioaddr = dev->base_addr;
- struct lance32_private *lp = (struct lance32_private *)dev->priv;
-
- if (dev->flags&IFF_PROMISC) {
- /* Log any net taps. */
- printk("%s: Promiscuous mode enabled.\n", dev->name);
- lp->init_block.mode = 0x8000;
- } else {
- int num_addrs=dev->mc_count;
- if(dev->flags&IFF_ALLMULTI)
- num_addrs=1;
- /* FIXIT: We don't use the multicast table, but rely on upper-layer filtering. */
- memset(lp->init_block.filter , (num_addrs == 0) ? 0 : -1, sizeof(lp->init_block.filter));
- lp->init_block.mode = 0x0000;
- }
-
- outw(0, ioaddr+LANCE_ADDR);
- outw(0x0004, ioaddr+LANCE_DATA); /* Temporarily stop the lance. */
-
- lance32_restart(dev, 0x0042, 0); /* Resume normal operation */
-
-}
-
-
-/*
- * Local variables:
- * compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -m486 -c lance32.c"
- * c-indent-level: 4
- * tab-width: 4
- * End:
- */
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TCL-scripts by Sam Shen, slshen@lbl.gov