patch-2.0.34 linux/drivers/net/pcnet32.c
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- Lines: 957
- Date:
Wed Jun 3 15:17:47 1998
- Orig file:
v2.0.33/linux/drivers/net/pcnet32.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.0.33/linux/drivers/net/pcnet32.c linux/drivers/net/pcnet32.c
@@ -0,0 +1,956 @@
+/* pcnet32.c: An AMD PCnet32 ethernet driver for linux. */
+/*
+ * Copyright 1996,97 Thomas Bogendoerfer, 1993-1995,1998 Donald Becker
+ * Copyright 1993 United States Government as represented by the
+ * Director, National Security Agency.
+ *
+ * Derived from the lance driver written 1993-1995 by Donald Becker.
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU Public License, incorporated herein by reference.
+ *
+ * This driver is for AMD PCnet-PCI based ethercards
+ */
+
+static const char *version = "pcnet32.c:v0.99B 4/4/98 DJBecker/TSBogend.\n";
+
+/* A few user-configurable values. */
+
+/* Maximum events (Rx packets, etc.) to handle at each interrupt. */
+static int max_interrupt_work = 20;
+
+/*
+ * 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).
+ */
+#define PCNET_LOG_TX_BUFFERS 4
+#define PCNET_LOG_RX_BUFFERS 4
+
+#include <linux/config.h>
+#ifdef MODULE
+#ifdef MODVERSIONS
+#include <linux/modversions.h>
+#endif
+#include <linux/module.h>
+#include <linux/version.h>
+#else
+#define MOD_INC_USE_COUNT
+#define MOD_DEC_USE_COUNT
+#endif
+
+#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>
+
+/* Driver verbosity level. 0 = no messages, 7 = wordy death.
+ Modify here, or when loading as a module. */
+static int pcnet32_debug = 1;
+
+/*
+ * 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 an 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)
+ * v0.12: by suggestion from Donald Becker: Renamed driver to pcnet32,
+ * made it standalone (no need for lance.c)
+ * v0.13: added additional PCI detecting for special PCI devices (Compaq)
+ * v0.14: stripped down additional PCI probe (thanks to David C Niemi
+ * and sveneric@xs4all.nl for testing this on their Compaq boxes)
+ * v0.15: added 79C965 (VLB) probe
+ * added interrupt sharing for PCI chips
+ * v0.16: fixed set_multicast_list on Alpha machines
+ * v0.17: removed hack from dev.c; now pcnet32 uses ethif_probe in Space.c
+ * v0.19: changed setting of autoselect bit
+ * v0.20: removed additional Compaq PCI probe; there is now a working one
+ * in arch/i386/bios32.c
+ * v0.21: added endian conversion for ppc, from work by cort@cs.nmt.edu
+ * v0.22: added printing of status to ring dump
+ * v0.23: changed enet_statistics to net_devive_stats
+ * v0.99: Changes for 2.0.34 final release. -djb
+ */
+
+
+#ifndef __powerpc__
+#define le16_to_cpu(val) (val)
+#define le32_to_cpu(val) (val)
+#endif
+#if (LINUX_VERSION_CODE < 0x20123)
+#define test_and_set_bit(val, addr) set_bit(val, addr)
+#endif
+
+#define TX_RING_SIZE (1 << (PCNET_LOG_TX_BUFFERS))
+#define TX_RING_MOD_MASK (TX_RING_SIZE - 1)
+#define TX_RING_LEN_BITS ((PCNET_LOG_TX_BUFFERS) << 12)
+
+#define RX_RING_SIZE (1 << (PCNET_LOG_RX_BUFFERS))
+#define RX_RING_MOD_MASK (RX_RING_SIZE - 1)
+#define RX_RING_LEN_BITS ((PCNET_LOG_RX_BUFFERS) << 4)
+
+#define PKT_BUF_SZ 1544
+
+/* Offsets from base I/O address. */
+enum pcnet_offsets { PCNET32_DATA=0x10, PCNET32_ADDR=0x12, PCNET32_RESET=0x14,
+ PCNET32_BUS_IF=0x16,};
+#define PCNET32_TOTAL_SIZE 0x20
+
+/* The PCNET32 Rx and Tx ring descriptors. */
+struct pcnet32_rx_head {
+ u32 base;
+ s16 buf_length;
+ s16 status;
+ u32 msg_length;
+ u32 reserved;
+};
+
+struct pcnet32_tx_head {
+ u32 base;
+ s16 length;
+ s16 status;
+ u32 misc;
+ u32 reserved;
+};
+
+/* The PCNET32 32-Bit initialization block, described in databook. */
+struct pcnet32_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 pcnet32_private {
+ /* The Tx and Rx ring entries must be aligned on 16-byte boundaries
+ in 32bit mode. */
+ struct pcnet32_rx_head rx_ring[RX_RING_SIZE];
+ struct pcnet32_tx_head tx_ring[TX_RING_SIZE];
+ struct pcnet32_init_block init_block;
+ const char *name;
+ struct device *next_module;
+ /* 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. */
+ struct enet_statistics stats;
+ char tx_full;
+ unsigned long lock;
+};
+
+static struct pcnet_chip_type {
+ int id_number;
+ const char *name;
+ int flags;
+} chip_table[] = {
+ {0x2420, "PCnet/PCI 79C970", 0},
+ {0x2430, "PCnet32", 0},
+ {0x2621, "PCnet/PCI II 79C970A", 0},
+ {0x2623, "PCnet/PCI II 79C971A", 0},
+ {0x0, "PCnet32 (unknown)", 0},
+};
+
+/* Index of functions. */
+int pcnet32_probe(struct device *dev);
+static int pcnet32_probe1(struct device *dev, unsigned int ioaddr, unsigned char irq_line);
+static int pcnet32_open(struct device *dev);
+static void pcnet32_init_ring(struct device *dev);
+static int pcnet32_start_xmit(struct sk_buff *skb, struct device *dev);
+static int pcnet32_rx(struct device *dev);
+static void pcnet32_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+static int pcnet32_close(struct device *dev);
+static struct enet_statistics *pcnet32_get_stats(struct device *dev);
+static void pcnet32_set_multicast_list(struct device *dev);
+
+
+/* A list of all installed PCnet32 devices, for removing the driver module. */
+static struct device *root_pcnet32_dev = NULL;
+
+int pcnet32_probe (struct device *dev)
+{
+ static int pci_index = 0; /* Static, for multiple probe calls. */
+ int cards_found = 0;
+
+ if ( ! pcibios_present())
+ return ENODEV;
+
+ for (;pci_index < 0xff; pci_index++) {
+ u8 irq_line;
+ u16 pci_command, new_command;
+ unsigned char pci_bus, pci_device_fn;
+ u32 pci_ioaddr;
+
+ if (pcibios_find_device (PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LANCE,
+ pci_index, &pci_bus, &pci_device_fn)
+ != PCIBIOS_SUCCESSFUL)
+ break;
+
+ pcibios_read_config_byte(pci_bus, pci_device_fn,
+ PCI_INTERRUPT_LINE, &irq_line);
+ pcibios_read_config_dword(pci_bus, pci_device_fn,
+ PCI_BASE_ADDRESS_0, &pci_ioaddr);
+ /* Remove I/O space marker in bit 0. */
+ pci_ioaddr &= ~3;
+
+ /* Avoid already found cards from previous pcnet32_probe() calls */
+ if (check_region(pci_ioaddr, PCNET32_TOTAL_SIZE))
+ continue;
+
+ /* Activate the card: fix for brain-damaged Win98 BIOSes. */
+ pcibios_read_config_word(pci_bus, pci_device_fn,
+ PCI_COMMAND, &pci_command);
+ new_command = pci_command | PCI_COMMAND_MASTER|PCI_COMMAND_IO;
+ if (pci_command != new_command) {
+ printk(KERN_INFO " The PCI BIOS has not enabled the AMD Ethernet"
+ " device at %2x-%2x."
+ " Updating PCI command %4.4x->%4.4x.\n",
+ pci_bus, pci_device_fn, pci_command, new_command);
+ pcibios_write_config_word(pci_bus, pci_device_fn,
+ PCI_COMMAND, new_command);
+ }
+
+#ifdef __powerpc__
+ /* This is bogus! -djb */
+ irq_line = 15;
+#endif
+
+ if (pcnet32_probe1(dev, pci_ioaddr, irq_line) != 0) {
+ /* Should never happen. */
+ printk(KERN_ERR "pcnet32.c: Probe of PCI card at %#x failed.\n",
+ pci_ioaddr);
+ } else
+ dev = 0;
+ cards_found++;
+ }
+
+ return cards_found ? 0 : -ENODEV;
+}
+
+
+/* pcnet32_probe1 */
+static int pcnet32_probe1(struct device *dev, unsigned int ioaddr, unsigned char irq_line)
+{
+ struct pcnet32_private *lp;
+ int i;
+ const char *chipname;
+
+ /* check if there is really a pcnet chip on that ioaddr */
+ if ((inb(ioaddr + 14) != 0x57) || (inb(ioaddr + 15) != 0x57))
+ return ENODEV;
+
+ inw(ioaddr+PCNET32_RESET); /* Reset the PCNET32 */
+
+ outw(0x0000, ioaddr+PCNET32_ADDR); /* Switch to window 0 */
+ if (inw(ioaddr+PCNET32_DATA) != 0x0004)
+ return ENODEV;
+
+ /* Get the version of the chip. */
+ outw(88, ioaddr+PCNET32_ADDR);
+ if (inw(ioaddr+PCNET32_ADDR) != 88) {
+ /* should never happen */
+ return ENODEV;
+ } else { /* Good, it's a newer chip. */
+ int chip_version = inw(ioaddr+PCNET32_DATA);
+ outw(89, ioaddr+PCNET32_ADDR);
+ chip_version |= inw(ioaddr+PCNET32_DATA) << 16;
+ if (pcnet32_debug > 2)
+ printk(" PCnet chip version is %#x.\n", chip_version);
+ if ((chip_version & 0xfff) != 0x003)
+ return ENODEV;
+ chip_version = (chip_version >> 12) & 0xffff;
+ for (i = 0; chip_table[i].id_number; i++)
+ if (chip_table[i].id_number == chip_version)
+ break;
+ chipname = chip_table[i].name;
+ }
+
+ dev = init_etherdev(dev, 0);
+
+ printk("%s: %s at %#3x,", dev->name, chipname, ioaddr);
+
+ /* There is a 16 byte station address PROM at the base address.
+ The first six bytes are the station address. */
+ for (i = 0; i < 6; i++)
+ printk(" %2.2x", dev->dev_addr[i] = inb(ioaddr + i));
+
+ dev->base_addr = ioaddr;
+ request_region(ioaddr, PCNET32_TOTAL_SIZE, dev->name);
+
+ /* Data structures used by the PCnet32 are 16byte aligned and DMAble. */
+ lp = (struct pcnet32_private *)
+ (((unsigned long)kmalloc(sizeof(*lp)+15, GFP_DMA | GFP_KERNEL)+15) & ~15);
+
+ memset(lp, 0, sizeof(*lp));
+ dev->priv = lp;
+
+ lp->next_module = root_pcnet32_dev;
+ root_pcnet32_dev = dev;
+
+ lp->name = chipname;
+ lp->rx_buffs = (unsigned long) kmalloc(PKT_BUF_SZ*RX_RING_SIZE, GFP_DMA | GFP_KERNEL);
+
+ lp->init_block.mode = le16_to_cpu(0x0003); /* Disable Rx and Tx. */
+ lp->init_block.tlen_rlen = le16_to_cpu(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)le32_to_cpu(virt_to_bus(lp->rx_ring));
+ lp->init_block.tx_ring = (u32)le32_to_cpu(virt_to_bus(lp->tx_ring));
+
+ /* switch pcnet32 to 32bit mode */
+ outw(0x0014, ioaddr+PCNET32_ADDR);
+ outw(0x0002, ioaddr+PCNET32_BUS_IF);
+
+ outw(0x0001, ioaddr+PCNET32_ADDR);
+ inw(ioaddr+PCNET32_ADDR);
+ outw(virt_to_bus(&lp->init_block) & 0xffff, ioaddr+PCNET32_DATA);
+ outw(0x0002, ioaddr+PCNET32_ADDR);
+ inw(ioaddr+PCNET32_ADDR);
+ outw(virt_to_bus(&lp->init_block) >> 16, ioaddr+PCNET32_DATA);
+ outw(0x0000, ioaddr+PCNET32_ADDR);
+ inw(ioaddr+PCNET32_ADDR);
+
+ dev->irq = irq_line;
+#ifdef __powerpc__
+ /* This is sooo bogus! -djb */
+ irq_line = 15;
+#endif
+
+ outw(0x0002, ioaddr+PCNET32_ADDR);
+ /* only touch autoselect bit */
+ outw(inw(ioaddr+PCNET32_BUS_IF) | 0x0002, ioaddr+PCNET32_BUS_IF);
+
+ if (pcnet32_debug > 0)
+ printk(version);
+
+ /* The PCNET32-specific entries in the device structure. */
+ dev->open = &pcnet32_open;
+ dev->hard_start_xmit = &pcnet32_start_xmit;
+ dev->stop = &pcnet32_close;
+ dev->get_stats = &pcnet32_get_stats;
+ dev->set_multicast_list = &pcnet32_set_multicast_list;
+
+ /* Fill in the generic fields of the device structure. */
+ ether_setup(dev);
+ return 0;
+}
+
+
+static int
+pcnet32_open(struct device *dev)
+{
+ struct pcnet32_private *lp = (struct pcnet32_private *)dev->priv;
+ unsigned int ioaddr = dev->base_addr;
+ int i;
+
+ if (dev->irq == 0 ||
+ request_irq(dev->irq, &pcnet32_interrupt, SA_SHIRQ,
+ dev->name, (void *)dev)) {
+ return -EAGAIN;
+ }
+ MOD_INC_USE_COUNT;
+
+ /* Reset the PCNET32 */
+ inw(ioaddr+PCNET32_RESET);
+
+ /* switch pcnet32 to 32bit mode */
+ outw(0x0014, ioaddr+PCNET32_ADDR);
+ outw(0x0002, ioaddr+PCNET32_BUS_IF);
+
+ /* Turn on auto-select of media (AUI, BNC). */
+ outw(0x0002, ioaddr+PCNET32_ADDR);
+ /* only touch autoselect bit */
+ outw(inw(ioaddr+PCNET32_BUS_IF) | 0x0002, ioaddr+PCNET32_BUS_IF);
+
+ if (pcnet32_debug > 1)
+ printk("%s: pcnet32_open() irq %d tx/rx rings %#x/%#x init %#x.\n",
+ dev->name, dev->irq,
+ (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;
+ pcnet32_init_ring(dev);
+
+ /* Re-initialize the PCNET32, and start it when done. */
+ outw(0x0001, ioaddr+PCNET32_ADDR);
+ outw(virt_to_bus(&lp->init_block) &0xffff, ioaddr+PCNET32_DATA);
+ outw(0x0002, ioaddr+PCNET32_ADDR);
+ outw(virt_to_bus(&lp->init_block) >> 16, ioaddr+PCNET32_DATA);
+
+ outw(0x0004, ioaddr+PCNET32_ADDR);
+ outw(0x0915, ioaddr+PCNET32_DATA);
+
+ outw(0x0000, ioaddr+PCNET32_ADDR);
+ outw(0x0001, ioaddr+PCNET32_DATA);
+
+ dev->tbusy = 0;
+ dev->interrupt = 0;
+ dev->start = 1;
+ i = 0;
+ while (i++ < 100)
+ if (inw(ioaddr+PCNET32_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+PCNET32_DATA);
+
+ if (pcnet32_debug > 2)
+ printk("%s: PCNET32 open after %d ticks, init block %#x csr0 %4.4x.\n",
+ dev->name, i, (u32) virt_to_bus(&lp->init_block), inw(ioaddr+PCNET32_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
+pcnet32_purge_tx_ring(struct device *dev)
+{
+ struct pcnet32_private *lp = (struct pcnet32_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 PCNET32 Rx and Tx rings. */
+static void
+pcnet32_init_ring(struct device *dev)
+{
+ struct pcnet32_private *lp = (struct pcnet32_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)le32_to_cpu(virt_to_bus((char *)lp->rx_buffs + i*PKT_BUF_SZ));
+ lp->rx_ring[i].buf_length = le16_to_cpu(-PKT_BUF_SZ);
+ lp->rx_ring[i].status = le16_to_cpu(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)le32_to_cpu(virt_to_bus(lp->rx_ring));
+ lp->init_block.tx_ring = (u32)le32_to_cpu(virt_to_bus(lp->tx_ring));
+}
+
+static void
+pcnet32_restart(struct device *dev, unsigned int csr0_bits, int must_reinit)
+{
+ int i;
+ unsigned int ioaddr = dev->base_addr;
+
+ pcnet32_purge_tx_ring(dev);
+ pcnet32_init_ring(dev);
+
+ outw(0x0000, ioaddr + PCNET32_ADDR);
+ /* ReInit Ring */
+ outw(0x0001, ioaddr + PCNET32_DATA);
+ i = 0;
+ while (i++ < 100)
+ if (inw(ioaddr+PCNET32_DATA) & 0x0100)
+ break;
+
+ outw(csr0_bits, ioaddr + PCNET32_DATA);
+}
+
+static int
+pcnet32_start_xmit(struct sk_buff *skb, struct device *dev)
+{
+ struct pcnet32_private *lp = (struct pcnet32_private *)dev->priv;
+ unsigned 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 < 20)
+ return 1;
+ outw(0, ioaddr+PCNET32_ADDR);
+ printk("%s: transmit timed out, status %4.4x, resetting.\n",
+ dev->name, inw(ioaddr+PCNET32_DATA));
+ outw(0x0004, ioaddr+PCNET32_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 %08x %04x", i & 1 ? "" : "\n ",
+ lp->rx_ring[i].base, -lp->rx_ring[i].buf_length,
+ lp->rx_ring[i].msg_length, (unsigned)lp->rx_ring[i].status);
+ for (i = 0 ; i < TX_RING_SIZE; i++)
+ printk("%s %08x %04x %08x %04x", i & 1 ? "" : "\n ",
+ lp->tx_ring[i].base, -lp->tx_ring[i].length,
+ lp->tx_ring[i].misc, (unsigned)lp->tx_ring[i].status);
+ printk("\n");
+ }
+#endif
+ pcnet32_restart(dev, 0x0042, 1);
+
+ dev->tbusy = 0;
+ dev->trans_start = jiffies;
+
+ return 0;
+ }
+
+ if (pcnet32_debug > 3) {
+ outw(0x0000, ioaddr+PCNET32_ADDR);
+ printk("%s: pcnet32_start_xmit() called, csr0 %4.4x.\n", dev->name,
+ inw(ioaddr+PCNET32_DATA));
+ outw(0x0000, ioaddr+PCNET32_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 (test_and_set_bit(0, (void*)&dev->tbusy) != 0) {
+ printk("%s: Transmitter access conflict.\n", dev->name);
+ return 1;
+ }
+
+ if (test_and_set_bit(0, (void*)&lp->lock) != 0) {
+ if (pcnet32_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 = le16_to_cpu(-skb->len);
+
+ lp->tx_ring[entry].misc = 0x00000000;
+
+ lp->tx_skbuff[entry] = skb;
+ lp->tx_ring[entry].base = (u32)le32_to_cpu(virt_to_bus(skb->data));
+ lp->tx_ring[entry].status = le16_to_cpu(0x8300);
+
+ lp->cur_tx++;
+
+ /* Trigger an immediate send poll. */
+ outw(0x0000, ioaddr+PCNET32_ADDR);
+ outw(0x0048, ioaddr+PCNET32_DATA);
+
+ dev->trans_start = jiffies;
+
+ save_flags(flags);
+ cli();
+ lp->lock = 0;
+ if (lp->tx_ring[(entry+1) & TX_RING_MOD_MASK].base == 0)
+ clear_bit(0, (void*)&dev->tbusy);
+ else
+ lp->tx_full = 1;
+ restore_flags(flags);
+
+ return 0;
+}
+
+/* The PCNET32 interrupt handler. */
+static void
+pcnet32_interrupt(int irq, void *dev_id, struct pt_regs * regs)
+{
+ struct device *dev = (struct device *)dev_id;
+ struct pcnet32_private *lp;
+ unsigned int csr0, ioaddr;
+ int boguscnt = max_interrupt_work;
+ int must_restart;
+
+ if (dev == NULL) {
+ printk ("pcnet32_interrupt(): irq %d for unknown device.\n", irq);
+ return;
+ }
+
+ ioaddr = dev->base_addr;
+ lp = (struct pcnet32_private *)dev->priv;
+ if (dev->interrupt)
+ printk("%s: Re-entering the interrupt handler.\n", dev->name);
+
+ dev->interrupt = 1;
+
+ outw(0x00, dev->base_addr + PCNET32_ADDR);
+ while ((csr0 = inw(dev->base_addr + PCNET32_DATA)) & 0x8600
+ && --boguscnt >= 0) {
+ /* Acknowledge all of the current interrupt sources ASAP. */
+ outw(csr0 & ~0x004f, dev->base_addr + PCNET32_DATA);
+
+ must_restart = 0;
+
+ if (pcnet32_debug > 5)
+ printk("%s: interrupt csr0=%#2.2x new csr=%#2.2x.\n",
+ dev->name, csr0, inw(dev->base_addr + PCNET32_DATA));
+
+ if (csr0 & 0x0400) /* Rx interrupt */
+ pcnet32_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 = (short)le16_to_cpu(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 = le16_to_cpu(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 (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;
+ clear_bit(0, (void*)&dev->tbusy);
+ 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 + PCNET32_ADDR);
+ outw(0x0004, dev->base_addr + PCNET32_DATA);
+ pcnet32_restart(dev, 0x0002, 0);
+ }
+ }
+
+ /* Clear any other interrupt, and set interrupt enable. */
+ outw(0x0000, dev->base_addr + PCNET32_ADDR);
+ outw(0x7940, dev->base_addr + PCNET32_DATA);
+
+ if (pcnet32_debug > 4)
+ printk("%s: exiting interrupt, csr%d=%#4.4x.\n",
+ dev->name, inw(ioaddr + PCNET32_ADDR),
+ inw(dev->base_addr + PCNET32_DATA));
+
+ dev->interrupt = 0;
+ return;
+}
+
+static int
+pcnet32_rx(struct device *dev)
+{
+ struct pcnet32_private *lp = (struct pcnet32_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 ((short)le16_to_cpu(lp->rx_ring[entry].status) >= 0) {
+ int status = (short)le16_to_cpu(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 &= le16_to_cpu(0x03ff);
+ }
+ else
+ {
+ /* Malloc up new buffer, compatible with net-2e. */
+ short pkt_len = (le32_to_cpu(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 ((short)le16_to_cpu(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 |= le16_to_cpu(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(le32_to_cpu(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 = le16_to_cpu(-PKT_BUF_SZ);
+ lp->rx_ring[entry].status |= le16_to_cpu(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
+pcnet32_close(struct device *dev)
+{
+ unsigned int ioaddr = dev->base_addr;
+ struct pcnet32_private *lp = (struct pcnet32_private *)dev->priv;
+
+ dev->start = 0;
+ set_bit(0, (void*)&dev->tbusy);
+
+ outw(112, ioaddr+PCNET32_ADDR);
+ lp->stats.rx_missed_errors = inw(ioaddr+PCNET32_DATA);
+
+ outw(0, ioaddr+PCNET32_ADDR);
+
+ if (pcnet32_debug > 1)
+ printk("%s: Shutting down ethercard, status was %2.2x.\n",
+ dev->name, inw(ioaddr+PCNET32_DATA));
+
+ /* We stop the PCNET32 here -- it occasionally polls
+ memory if we don't. */
+ outw(0x0004, ioaddr+PCNET32_DATA);
+
+ free_irq(dev->irq, dev);
+ MOD_DEC_USE_COUNT;
+
+ return 0;
+}
+
+static struct enet_statistics *pcnet32_get_stats(struct device *dev)
+{
+ struct pcnet32_private *lp = (struct pcnet32_private *)dev->priv;
+ unsigned int ioaddr = dev->base_addr;
+ unsigned short saved_addr;
+ unsigned long flags;
+
+ save_flags(flags);
+ cli();
+ saved_addr = inw(ioaddr+PCNET32_ADDR);
+ outw(112, ioaddr+PCNET32_ADDR);
+ lp->stats.rx_missed_errors = inw(ioaddr+PCNET32_DATA);
+ outw(saved_addr, ioaddr+PCNET32_ADDR);
+ restore_flags(flags);
+
+ return &lp->stats;
+}
+
+/* Set or clear the multicast filter for this adaptor.
+ */
+
+static void pcnet32_set_multicast_list(struct device *dev)
+{
+ unsigned int ioaddr = dev->base_addr;
+ struct pcnet32_private *lp = (struct pcnet32_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+PCNET32_ADDR);
+ outw(0x0004, ioaddr+PCNET32_DATA); /* Temporarily stop the lance. */
+
+ pcnet32_restart(dev, 0x0042, 0); /* Resume normal operation */
+
+}
+
+
+#ifdef MODULE
+#if LINUX_VERSION_CODE > 0x20118
+MODULE_AUTHOR("Donald Becker <becker@cesdis.gsfc.nasa.gov>");
+MODULE_DESCRIPTION("AMD PCnet/PCI ethernet driver");
+MODULE_PARM(debug, "i");
+MODULE_PARM(max_interrupt_work, "i");
+MODULE_PARM(rx_copybreak, "i");
+MODULE_PARM(options, "1-" __MODULE_STRING(MAX_UNITS) "i");
+MODULE_PARM(full_duplex, "1-" __MODULE_STRING(MAX_UNITS) "i");
+#endif
+
+/* An additional parameter that may be passed in... */
+static int debug = -1;
+
+int
+init_module(void)
+{
+ if (debug >= 0)
+ pcnet32_debug = debug;
+
+#ifdef CARDBUS
+ register_driver(&pcnet32_ops);
+ return 0;
+#else
+ return pcnet32_probe(NULL);
+#endif
+}
+
+void
+cleanup_module(void)
+{
+ struct device *next_dev;
+
+#ifdef CARDBUS
+ unregister_driver(&pcnet32_ops);
+#endif
+
+ /* No need to check MOD_IN_USE, as sys_delete_module() checks. */
+ while (root_pcnet32_dev) {
+ next_dev = ((struct pcnet32_private *)root_pcnet32_dev->priv)->next_module;
+ unregister_netdev(root_pcnet32_dev);
+ release_region(root_pcnet32_dev->base_addr, PCNET32_TOTAL_SIZE);
+ kfree(root_pcnet32_dev);
+ root_pcnet32_dev = next_dev;
+ }
+}
+
+#endif /* MODULE */
+
+
+/*
+ * Local variables:
+ * compile-command: "gcc -DMODULE -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -c pcnet32.c `[ -f /usr/include/linux/modversions.h ] && echo -DMODVERSIONS`"
+ * c-indent-level: 4
+ * c-basic-offset: 4
+ * tab-width: 4
+ * End:
+ */
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