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-rw-r--r--drivers/net/3c527.c1675
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diff --git a/drivers/net/3c527.c b/drivers/net/3c527.c
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+/* 3c527.c: 3Com Etherlink/MC32 driver for Linux 2.4 and 2.6.
+ *
+ * (c) Copyright 1998 Red Hat Software Inc
+ * Written by Alan Cox.
+ * Further debugging by Carl Drougge.
+ * Initial SMP support by Felipe W Damasio <felipewd@terra.com.br>
+ * Heavily modified by Richard Procter <rnp@paradise.net.nz>
+ *
+ * Based on skeleton.c written 1993-94 by Donald Becker and ne2.c
+ * (for the MCA stuff) written by Wim Dumon.
+ *
+ * Thanks to 3Com for making this possible by providing me with the
+ * documentation.
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ *
+ */
+
+#define DRV_NAME "3c527"
+#define DRV_VERSION "0.7-SMP"
+#define DRV_RELDATE "2003/09/21"
+
+static const char *version =
+DRV_NAME ".c:v" DRV_VERSION " " DRV_RELDATE " Richard Procter <rnp@paradise.net.nz>\n";
+
+/**
+ * DOC: Traps for the unwary
+ *
+ * The diagram (Figure 1-1) and the POS summary disagree with the
+ * "Interrupt Level" section in the manual.
+ *
+ * The manual contradicts itself when describing the minimum number
+ * buffers in the 'configure lists' command.
+ * My card accepts a buffer config of 4/4.
+ *
+ * Setting the SAV BP bit does not save bad packets, but
+ * only enables RX on-card stats collection.
+ *
+ * The documentation in places seems to miss things. In actual fact
+ * I've always eventually found everything is documented, it just
+ * requires careful study.
+ *
+ * DOC: Theory Of Operation
+ *
+ * The 3com 3c527 is a 32bit MCA bus mastering adapter with a large
+ * amount of on board intelligence that housekeeps a somewhat dumber
+ * Intel NIC. For performance we want to keep the transmit queue deep
+ * as the card can transmit packets while fetching others from main
+ * memory by bus master DMA. Transmission and reception are driven by
+ * circular buffer queues.
+ *
+ * The mailboxes can be used for controlling how the card traverses
+ * its buffer rings, but are used only for inital setup in this
+ * implementation. The exec mailbox allows a variety of commands to
+ * be executed. Each command must complete before the next is
+ * executed. Primarily we use the exec mailbox for controlling the
+ * multicast lists. We have to do a certain amount of interesting
+ * hoop jumping as the multicast list changes can occur in interrupt
+ * state when the card has an exec command pending. We defer such
+ * events until the command completion interrupt.
+ *
+ * A copy break scheme (taken from 3c59x.c) is employed whereby
+ * received frames exceeding a configurable length are passed
+ * directly to the higher networking layers without incuring a copy,
+ * in what amounts to a time/space trade-off.
+ *
+ * The card also keeps a large amount of statistical information
+ * on-board. In a perfect world, these could be used safely at no
+ * cost. However, lacking information to the contrary, processing
+ * them without races would involve so much extra complexity as to
+ * make it unworthwhile to do so. In the end, a hybrid SW/HW
+ * implementation was made necessary --- see mc32_update_stats().
+ *
+ * DOC: Notes
+ *
+ * It should be possible to use two or more cards, but at this stage
+ * only by loading two copies of the same module.
+ *
+ * The on-board 82586 NIC has trouble receiving multiple
+ * back-to-back frames and so is likely to drop packets from fast
+ * senders.
+**/
+
+#include <linux/module.h>
+
+#include <linux/errno.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/if_ether.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/mca-legacy.h>
+#include <linux/ioport.h>
+#include <linux/in.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/wait.h>
+#include <linux/ethtool.h>
+#include <linux/completion.h>
+#include <linux/bitops.h>
+
+#include <asm/semaphore.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+
+#include "3c527.h"
+
+MODULE_LICENSE("GPL");
+
+/*
+ * The name of the card. Is used for messages and in the requests for
+ * io regions, irqs and dma channels
+ */
+static const char* cardname = DRV_NAME;
+
+/* use 0 for production, 1 for verification, >2 for debug */
+#ifndef NET_DEBUG
+#define NET_DEBUG 2
+#endif
+
+#undef DEBUG_IRQ
+
+static unsigned int mc32_debug = NET_DEBUG;
+
+/* The number of low I/O ports used by the ethercard. */
+#define MC32_IO_EXTENT 8
+
+/* As implemented, values must be a power-of-2 -- 4/8/16/32 */
+#define TX_RING_LEN 32 /* Typically the card supports 37 */
+#define RX_RING_LEN 8 /* " " " */
+
+/* Copy break point, see above for details.
+ * Setting to > 1512 effectively disables this feature. */
+#define RX_COPYBREAK 200 /* Value from 3c59x.c */
+
+/* Issue the 82586 workaround command - this is for "busy lans", but
+ * basically means for all lans now days - has a performance (latency)
+ * cost, but best set. */
+static const int WORKAROUND_82586=1;
+
+/* Pointers to buffers and their on-card records */
+struct mc32_ring_desc
+{
+ volatile struct skb_header *p;
+ struct sk_buff *skb;
+};
+
+/* Information that needs to be kept for each board. */
+struct mc32_local
+{
+ int slot;
+
+ u32 base;
+ struct net_device_stats net_stats;
+ volatile struct mc32_mailbox *rx_box;
+ volatile struct mc32_mailbox *tx_box;
+ volatile struct mc32_mailbox *exec_box;
+ volatile struct mc32_stats *stats; /* Start of on-card statistics */
+ u16 tx_chain; /* Transmit list start offset */
+ u16 rx_chain; /* Receive list start offset */
+ u16 tx_len; /* Transmit list count */
+ u16 rx_len; /* Receive list count */
+
+ u16 xceiver_desired_state; /* HALTED or RUNNING */
+ u16 cmd_nonblocking; /* Thread is uninterested in command result */
+ u16 mc_reload_wait; /* A multicast load request is pending */
+ u32 mc_list_valid; /* True when the mclist is set */
+
+ struct mc32_ring_desc tx_ring[TX_RING_LEN]; /* Host Transmit ring */
+ struct mc32_ring_desc rx_ring[RX_RING_LEN]; /* Host Receive ring */
+
+ atomic_t tx_count; /* buffers left */
+ atomic_t tx_ring_head; /* index to tx en-queue end */
+ u16 tx_ring_tail; /* index to tx de-queue end */
+
+ u16 rx_ring_tail; /* index to rx de-queue end */
+
+ struct semaphore cmd_mutex; /* Serialises issuing of execute commands */
+ struct completion execution_cmd; /* Card has completed an execute command */
+ struct completion xceiver_cmd; /* Card has completed a tx or rx command */
+};
+
+/* The station (ethernet) address prefix, used for a sanity check. */
+#define SA_ADDR0 0x02
+#define SA_ADDR1 0x60
+#define SA_ADDR2 0xAC
+
+struct mca_adapters_t {
+ unsigned int id;
+ char *name;
+};
+
+static const struct mca_adapters_t mc32_adapters[] = {
+ { 0x0041, "3COM EtherLink MC/32" },
+ { 0x8EF5, "IBM High Performance Lan Adapter" },
+ { 0x0000, NULL }
+};
+
+
+/* Macros for ring index manipulations */
+static inline u16 next_rx(u16 rx) { return (rx+1)&(RX_RING_LEN-1); };
+static inline u16 prev_rx(u16 rx) { return (rx-1)&(RX_RING_LEN-1); };
+
+static inline u16 next_tx(u16 tx) { return (tx+1)&(TX_RING_LEN-1); };
+
+
+/* Index to functions, as function prototypes. */
+static int mc32_probe1(struct net_device *dev, int ioaddr);
+static int mc32_command(struct net_device *dev, u16 cmd, void *data, int len);
+static int mc32_open(struct net_device *dev);
+static void mc32_timeout(struct net_device *dev);
+static int mc32_send_packet(struct sk_buff *skb, struct net_device *dev);
+static irqreturn_t mc32_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+static int mc32_close(struct net_device *dev);
+static struct net_device_stats *mc32_get_stats(struct net_device *dev);
+static void mc32_set_multicast_list(struct net_device *dev);
+static void mc32_reset_multicast_list(struct net_device *dev);
+static struct ethtool_ops netdev_ethtool_ops;
+
+static void cleanup_card(struct net_device *dev)
+{
+ struct mc32_local *lp = netdev_priv(dev);
+ unsigned slot = lp->slot;
+ mca_mark_as_unused(slot);
+ mca_set_adapter_name(slot, NULL);
+ free_irq(dev->irq, dev);
+ release_region(dev->base_addr, MC32_IO_EXTENT);
+}
+
+/**
+ * mc32_probe - Search for supported boards
+ * @unit: interface number to use
+ *
+ * Because MCA bus is a real bus and we can scan for cards we could do a
+ * single scan for all boards here. Right now we use the passed in device
+ * structure and scan for only one board. This needs fixing for modules
+ * in particular.
+ */
+
+struct net_device *__init mc32_probe(int unit)
+{
+ struct net_device *dev = alloc_etherdev(sizeof(struct mc32_local));
+ static int current_mca_slot = -1;
+ int i;
+ int err;
+
+ if (!dev)
+ return ERR_PTR(-ENOMEM);
+
+ if (unit >= 0)
+ sprintf(dev->name, "eth%d", unit);
+
+ SET_MODULE_OWNER(dev);
+
+ /* Do not check any supplied i/o locations.
+ POS registers usually don't fail :) */
+
+ /* MCA cards have POS registers.
+ Autodetecting MCA cards is extremely simple.
+ Just search for the card. */
+
+ for(i = 0; (mc32_adapters[i].name != NULL); i++) {
+ current_mca_slot =
+ mca_find_unused_adapter(mc32_adapters[i].id, 0);
+
+ if(current_mca_slot != MCA_NOTFOUND) {
+ if(!mc32_probe1(dev, current_mca_slot))
+ {
+ mca_set_adapter_name(current_mca_slot,
+ mc32_adapters[i].name);
+ mca_mark_as_used(current_mca_slot);
+ err = register_netdev(dev);
+ if (err) {
+ cleanup_card(dev);
+ free_netdev(dev);
+ dev = ERR_PTR(err);
+ }
+ return dev;
+ }
+
+ }
+ }
+ free_netdev(dev);
+ return ERR_PTR(-ENODEV);
+}
+
+/**
+ * mc32_probe1 - Check a given slot for a board and test the card
+ * @dev: Device structure to fill in
+ * @slot: The MCA bus slot being used by this card
+ *
+ * Decode the slot data and configure the card structures. Having done this we
+ * can reset the card and configure it. The card does a full self test cycle
+ * in firmware so we have to wait for it to return and post us either a
+ * failure case or some addresses we use to find the board internals.
+ */
+
+static int __init mc32_probe1(struct net_device *dev, int slot)
+{
+ static unsigned version_printed;
+ int i, err;
+ u8 POS;
+ u32 base;
+ struct mc32_local *lp = netdev_priv(dev);
+ static u16 mca_io_bases[]={
+ 0x7280,0x7290,
+ 0x7680,0x7690,
+ 0x7A80,0x7A90,
+ 0x7E80,0x7E90
+ };
+ static u32 mca_mem_bases[]={
+ 0x00C0000,
+ 0x00C4000,
+ 0x00C8000,
+ 0x00CC000,
+ 0x00D0000,
+ 0x00D4000,
+ 0x00D8000,
+ 0x00DC000
+ };
+ static char *failures[]={
+ "Processor instruction",
+ "Processor data bus",
+ "Processor data bus",
+ "Processor data bus",
+ "Adapter bus",
+ "ROM checksum",
+ "Base RAM",
+ "Extended RAM",
+ "82586 internal loopback",
+ "82586 initialisation failure",
+ "Adapter list configuration error"
+ };
+
+ /* Time to play MCA games */
+
+ if (mc32_debug && version_printed++ == 0)
+ printk(KERN_DEBUG "%s", version);
+
+ printk(KERN_INFO "%s: %s found in slot %d:", dev->name, cardname, slot);
+
+ POS = mca_read_stored_pos(slot, 2);
+
+ if(!(POS&1))
+ {
+ printk(" disabled.\n");
+ return -ENODEV;
+ }
+
+ /* Fill in the 'dev' fields. */
+ dev->base_addr = mca_io_bases[(POS>>1)&7];
+ dev->mem_start = mca_mem_bases[(POS>>4)&7];
+
+ POS = mca_read_stored_pos(slot, 4);
+ if(!(POS&1))
+ {
+ printk("memory window disabled.\n");
+ return -ENODEV;
+ }
+
+ POS = mca_read_stored_pos(slot, 5);
+
+ i=(POS>>4)&3;
+ if(i==3)
+ {
+ printk("invalid memory window.\n");
+ return -ENODEV;
+ }
+
+ i*=16384;
+ i+=16384;
+
+ dev->mem_end=dev->mem_start + i;
+
+ dev->irq = ((POS>>2)&3)+9;
+
+ if(!request_region(dev->base_addr, MC32_IO_EXTENT, cardname))
+ {
+ printk("io 0x%3lX, which is busy.\n", dev->base_addr);
+ return -EBUSY;
+ }
+
+ printk("io 0x%3lX irq %d mem 0x%lX (%dK)\n",
+ dev->base_addr, dev->irq, dev->mem_start, i/1024);
+
+
+ /* We ought to set the cache line size here.. */
+
+
+ /*
+ * Go PROM browsing
+ */
+
+ printk("%s: Address ", dev->name);
+
+ /* Retrieve and print the ethernet address. */
+ for (i = 0; i < 6; i++)
+ {
+ mca_write_pos(slot, 6, i+12);
+ mca_write_pos(slot, 7, 0);
+
+ printk(" %2.2x", dev->dev_addr[i] = mca_read_pos(slot,3));
+ }
+
+ mca_write_pos(slot, 6, 0);
+ mca_write_pos(slot, 7, 0);
+
+ POS = mca_read_stored_pos(slot, 4);
+
+ if(POS&2)
+ printk(" : BNC port selected.\n");
+ else
+ printk(" : AUI port selected.\n");
+
+ POS=inb(dev->base_addr+HOST_CTRL);
+ POS|=HOST_CTRL_ATTN|HOST_CTRL_RESET;
+ POS&=~HOST_CTRL_INTE;
+ outb(POS, dev->base_addr+HOST_CTRL);
+ /* Reset adapter */
+ udelay(100);
+ /* Reset off */
+ POS&=~(HOST_CTRL_ATTN|HOST_CTRL_RESET);
+ outb(POS, dev->base_addr+HOST_CTRL);
+
+ udelay(300);
+
+ /*
+ * Grab the IRQ
+ */
+
+ err = request_irq(dev->irq, &mc32_interrupt, SA_SHIRQ | SA_SAMPLE_RANDOM, DRV_NAME, dev);
+ if (err) {
+ release_region(dev->base_addr, MC32_IO_EXTENT);
+ printk(KERN_ERR "%s: unable to get IRQ %d.\n", DRV_NAME, dev->irq);
+ goto err_exit_ports;
+ }
+
+ memset(lp, 0, sizeof(struct mc32_local));
+ lp->slot = slot;
+
+ i=0;
+
+ base = inb(dev->base_addr);
+
+ while(base == 0xFF)
+ {
+ i++;
+ if(i == 1000)
+ {
+ printk(KERN_ERR "%s: failed to boot adapter.\n", dev->name);
+ err = -ENODEV;
+ goto err_exit_irq;
+ }
+ udelay(1000);
+ if(inb(dev->base_addr+2)&(1<<5))
+ base = inb(dev->base_addr);
+ }
+
+ if(base>0)
+ {
+ if(base < 0x0C)
+ printk(KERN_ERR "%s: %s%s.\n", dev->name, failures[base-1],
+ base<0x0A?" test failure":"");
+ else
+ printk(KERN_ERR "%s: unknown failure %d.\n", dev->name, base);
+ err = -ENODEV;
+ goto err_exit_irq;
+ }
+
+ base=0;
+ for(i=0;i<4;i++)
+ {
+ int n=0;
+
+ while(!(inb(dev->base_addr+2)&(1<<5)))
+ {
+ n++;
+ udelay(50);
+ if(n>100)
+ {
+ printk(KERN_ERR "%s: mailbox read fail (%d).\n", dev->name, i);
+ err = -ENODEV;
+ goto err_exit_irq;
+ }
+ }
+
+ base|=(inb(dev->base_addr)<<(8*i));
+ }
+
+ lp->exec_box=isa_bus_to_virt(dev->mem_start+base);
+
+ base=lp->exec_box->data[1]<<16|lp->exec_box->data[0];
+
+ lp->base = dev->mem_start+base;
+
+ lp->rx_box=isa_bus_to_virt(lp->base + lp->exec_box->data[2]);
+ lp->tx_box=isa_bus_to_virt(lp->base + lp->exec_box->data[3]);
+
+ lp->stats = isa_bus_to_virt(lp->base + lp->exec_box->data[5]);
+
+ /*
+ * Descriptor chains (card relative)
+ */
+
+ lp->tx_chain = lp->exec_box->data[8]; /* Transmit list start offset */
+ lp->rx_chain = lp->exec_box->data[10]; /* Receive list start offset */
+ lp->tx_len = lp->exec_box->data[9]; /* Transmit list count */
+ lp->rx_len = lp->exec_box->data[11]; /* Receive list count */
+
+ init_MUTEX_LOCKED(&lp->cmd_mutex);
+ init_completion(&lp->execution_cmd);
+ init_completion(&lp->xceiver_cmd);
+
+ printk("%s: Firmware Rev %d. %d RX buffers, %d TX buffers. Base of 0x%08X.\n",
+ dev->name, lp->exec_box->data[12], lp->rx_len, lp->tx_len, lp->base);
+
+ dev->open = mc32_open;
+ dev->stop = mc32_close;
+ dev->hard_start_xmit = mc32_send_packet;
+ dev->get_stats = mc32_get_stats;
+ dev->set_multicast_list = mc32_set_multicast_list;
+ dev->tx_timeout = mc32_timeout;
+ dev->watchdog_timeo = HZ*5; /* Board does all the work */
+ dev->ethtool_ops = &netdev_ethtool_ops;
+
+ return 0;
+
+err_exit_irq:
+ free_irq(dev->irq, dev);
+err_exit_ports:
+ release_region(dev->base_addr, MC32_IO_EXTENT);
+ return err;
+}
+
+
+/**
+ * mc32_ready_poll - wait until we can feed it a command
+ * @dev: The device to wait for
+ *
+ * Wait until the card becomes ready to accept a command via the
+ * command register. This tells us nothing about the completion
+ * status of any pending commands and takes very little time at all.
+ */
+
+static inline void mc32_ready_poll(struct net_device *dev)
+{
+ int ioaddr = dev->base_addr;
+ while(!(inb(ioaddr+HOST_STATUS)&HOST_STATUS_CRR));
+}
+
+
+/**
+ * mc32_command_nowait - send a command non blocking
+ * @dev: The 3c527 to issue the command to
+ * @cmd: The command word to write to the mailbox
+ * @data: A data block if the command expects one
+ * @len: Length of the data block
+ *
+ * Send a command from interrupt state. If there is a command
+ * currently being executed then we return an error of -1. It
+ * simply isn't viable to wait around as commands may be
+ * slow. This can theoretically be starved on SMP, but it's hard
+ * to see a realistic situation. We do not wait for the command
+ * to complete --- we rely on the interrupt handler to tidy up
+ * after us.
+ */
+
+static int mc32_command_nowait(struct net_device *dev, u16 cmd, void *data, int len)
+{
+ struct mc32_local *lp = netdev_priv(dev);
+ int ioaddr = dev->base_addr;
+ int ret = -1;
+
+ if (down_trylock(&lp->cmd_mutex) == 0)
+ {
+ lp->cmd_nonblocking=1;
+ lp->exec_box->mbox=0;
+ lp->exec_box->mbox=cmd;
+ memcpy((void *)lp->exec_box->data, data, len);
+ barrier(); /* the memcpy forgot the volatile so be sure */
+
+ /* Send the command */
+ mc32_ready_poll(dev);
+ outb(1<<6, ioaddr+HOST_CMD);
+
+ ret = 0;
+
+ /* Interrupt handler will signal mutex on completion */
+ }
+
+ return ret;
+}
+
+
+/**
+ * mc32_command - send a command and sleep until completion
+ * @dev: The 3c527 card to issue the command to
+ * @cmd: The command word to write to the mailbox
+ * @data: A data block if the command expects one
+ * @len: Length of the data block
+ *
+ * Sends exec commands in a user context. This permits us to wait around
+ * for the replies and also to wait for the command buffer to complete
+ * from a previous command before we execute our command. After our
+ * command completes we will attempt any pending multicast reload
+ * we blocked off by hogging the exec buffer.
+ *
+ * You feed the card a command, you wait, it interrupts you get a
+ * reply. All well and good. The complication arises because you use
+ * commands for filter list changes which come in at bh level from things
+ * like IPV6 group stuff.
+ */
+
+static int mc32_command(struct net_device *dev, u16 cmd, void *data, int len)
+{
+ struct mc32_local *lp = netdev_priv(dev);
+ int ioaddr = dev->base_addr;
+ int ret = 0;
+
+ down(&lp->cmd_mutex);
+
+ /*
+ * My Turn
+ */
+
+ lp->cmd_nonblocking=0;
+ lp->exec_box->mbox=0;
+ lp->exec_box->mbox=cmd;
+ memcpy((void *)lp->exec_box->data, data, len);
+ barrier(); /* the memcpy forgot the volatile so be sure */
+
+ mc32_ready_poll(dev);
+ outb(1<<6, ioaddr+HOST_CMD);
+
+ wait_for_completion(&lp->execution_cmd);
+
+ if(lp->exec_box->mbox&(1<<13))
+ ret = -1;
+
+ up(&lp->cmd_mutex);
+
+ /*
+ * A multicast set got blocked - try it now
+ */
+
+ if(lp->mc_reload_wait)
+ {
+ mc32_reset_multicast_list(dev);
+ }
+
+ return ret;
+}
+
+
+/**
+ * mc32_start_transceiver - tell board to restart tx/rx
+ * @dev: The 3c527 card to issue the command to
+ *
+ * This may be called from the interrupt state, where it is used
+ * to restart the rx ring if the card runs out of rx buffers.
+ *
+ * We must first check if it's ok to (re)start the transceiver. See
+ * mc32_close for details.
+ */
+
+static void mc32_start_transceiver(struct net_device *dev) {
+
+ struct mc32_local *lp = netdev_priv(dev);
+ int ioaddr = dev->base_addr;
+
+ /* Ignore RX overflow on device closure */
+ if (lp->xceiver_desired_state==HALTED)
+ return;
+
+ /* Give the card the offset to the post-EOL-bit RX descriptor */
+ mc32_ready_poll(dev);
+ lp->rx_box->mbox=0;
+ lp->rx_box->data[0]=lp->rx_ring[prev_rx(lp->rx_ring_tail)].p->next;
+ outb(HOST_CMD_START_RX, ioaddr+HOST_CMD);
+
+ mc32_ready_poll(dev);
+ lp->tx_box->mbox=0;
+ outb(HOST_CMD_RESTRT_TX, ioaddr+HOST_CMD); /* card ignores this on RX restart */
+
+ /* We are not interrupted on start completion */
+}
+
+
+/**
+ * mc32_halt_transceiver - tell board to stop tx/rx
+ * @dev: The 3c527 card to issue the command to
+ *
+ * We issue the commands to halt the card's transceiver. In fact,
+ * after some experimenting we now simply tell the card to
+ * suspend. When issuing aborts occasionally odd things happened.
+ *
+ * We then sleep until the card has notified us that both rx and
+ * tx have been suspended.
+ */
+
+static void mc32_halt_transceiver(struct net_device *dev)
+{
+ struct mc32_local *lp = netdev_priv(dev);
+ int ioaddr = dev->base_addr;
+
+ mc32_ready_poll(dev);
+ lp->rx_box->mbox=0;
+ outb(HOST_CMD_SUSPND_RX, ioaddr+HOST_CMD);
+ wait_for_completion(&lp->xceiver_cmd);
+
+ mc32_ready_poll(dev);
+ lp->tx_box->mbox=0;
+ outb(HOST_CMD_SUSPND_TX, ioaddr+HOST_CMD);
+ wait_for_completion(&lp->xceiver_cmd);
+}
+
+
+/**
+ * mc32_load_rx_ring - load the ring of receive buffers
+ * @dev: 3c527 to build the ring for
+ *
+ * This initalises the on-card and driver datastructures to
+ * the point where mc32_start_transceiver() can be called.
+ *
+ * The card sets up the receive ring for us. We are required to use the
+ * ring it provides, although the size of the ring is configurable.
+ *
+ * We allocate an sk_buff for each ring entry in turn and
+ * initalise its house-keeping info. At the same time, we read
+ * each 'next' pointer in our rx_ring array. This reduces slow
+ * shared-memory reads and makes it easy to access predecessor
+ * descriptors.
+ *
+ * We then set the end-of-list bit for the last entry so that the
+ * card will know when it has run out of buffers.
+ */
+
+static int mc32_load_rx_ring(struct net_device *dev)
+{
+ struct mc32_local *lp = netdev_priv(dev);
+ int i;
+ u16 rx_base;
+ volatile struct skb_header *p;
+
+ rx_base=lp->rx_chain;
+
+ for(i=0; i<RX_RING_LEN; i++) {
+ lp->rx_ring[i].skb=alloc_skb(1532, GFP_KERNEL);
+ if (lp->rx_ring[i].skb==NULL) {
+ for (;i>=0;i--)
+ kfree_skb(lp->rx_ring[i].skb);
+ return -ENOBUFS;
+ }
+ skb_reserve(lp->rx_ring[i].skb, 18);
+
+ p=isa_bus_to_virt(lp->base+rx_base);
+
+ p->control=0;
+ p->data=isa_virt_to_bus(lp->rx_ring[i].skb->data);
+ p->status=0;
+ p->length=1532;
+
+ lp->rx_ring[i].p=p;
+ rx_base=p->next;
+ }
+
+ lp->rx_ring[i-1].p->control |= CONTROL_EOL;
+
+ lp->rx_ring_tail=0;
+
+ return 0;
+}
+
+
+/**
+ * mc32_flush_rx_ring - free the ring of receive buffers
+ * @lp: Local data of 3c527 to flush the rx ring of
+ *
+ * Free the buffer for each ring slot. This may be called
+ * before mc32_load_rx_ring(), eg. on error in mc32_open().
+ * Requires rx skb pointers to point to a valid skb, or NULL.
+ */
+
+static void mc32_flush_rx_ring(struct net_device *dev)
+{
+ struct mc32_local *lp = netdev_priv(dev);
+ int i;
+
+ for(i=0; i < RX_RING_LEN; i++)
+ {
+ if (lp->rx_ring[i].skb) {
+ dev_kfree_skb(lp->rx_ring[i].skb);
+ lp->rx_ring[i].skb = NULL;
+ }
+ lp->rx_ring[i].p=NULL;
+ }
+}
+
+
+/**
+ * mc32_load_tx_ring - load transmit ring
+ * @dev: The 3c527 card to issue the command to
+ *
+ * This sets up the host transmit data-structures.
+ *
+ * First, we obtain from the card it's current postion in the tx
+ * ring, so that we will know where to begin transmitting
+ * packets.
+ *
+ * Then, we read the 'next' pointers from the on-card tx ring into
+ * our tx_ring array to reduce slow shared-mem reads. Finally, we
+ * intitalise the tx house keeping variables.
+ *
+ */
+
+static void mc32_load_tx_ring(struct net_device *dev)
+{
+ struct mc32_local *lp = netdev_priv(dev);
+ volatile struct skb_header *p;
+ int i;
+ u16 tx_base;
+
+ tx_base=lp->tx_box->data[0];
+
+ for(i=0 ; i<TX_RING_LEN ; i++)
+ {
+ p=isa_bus_to_virt(lp->base+tx_base);
+ lp->tx_ring[i].p=p;
+ lp->tx_ring[i].skb=NULL;
+
+ tx_base=p->next;
+ }
+
+ /* -1 so that tx_ring_head cannot "lap" tx_ring_tail */
+ /* see mc32_tx_ring */
+
+ atomic_set(&lp->tx_count, TX_RING_LEN-1);
+ atomic_set(&lp->tx_ring_head, 0);
+ lp->tx_ring_tail=0;
+}
+
+
+/**
+ * mc32_flush_tx_ring - free transmit ring
+ * @lp: Local data of 3c527 to flush the tx ring of
+ *
+ * If the ring is non-empty, zip over the it, freeing any
+ * allocated skb_buffs. The tx ring house-keeping variables are
+ * then reset. Requires rx skb pointers to point to a valid skb,
+ * or NULL.
+ */
+
+static void mc32_flush_tx_ring(struct net_device *dev)
+{
+ struct mc32_local *lp = netdev_priv(dev);
+ int i;
+
+ for (i=0; i < TX_RING_LEN; i++)
+ {
+ if (lp->tx_ring[i].skb)
+ {
+ dev_kfree_skb(lp->tx_ring[i].skb);
+ lp->tx_ring[i].skb = NULL;
+ }
+ }
+
+ atomic_set(&lp->tx_count, 0);
+ atomic_set(&lp->tx_ring_head, 0);
+ lp->tx_ring_tail=0;
+}
+
+
+/**
+ * mc32_open - handle 'up' of card
+ * @dev: device to open
+ *
+ * The user is trying to bring the card into ready state. This requires
+ * a brief dialogue with the card. Firstly we enable interrupts and then
+ * 'indications'. Without these enabled the card doesn't bother telling
+ * us what it has done. This had me puzzled for a week.
+ *
+ * We configure the number of card descriptors, then load the network
+ * address and multicast filters. Turn on the workaround mode. This
+ * works around a bug in the 82586 - it asks the firmware to do
+ * so. It has a performance (latency) hit but is needed on busy
+ * [read most] lans. We load the ring with buffers then we kick it
+ * all off.
+ */
+
+static int mc32_open(struct net_device *dev)
+{
+ int ioaddr = dev->base_addr;
+ struct mc32_local *lp = netdev_priv(dev);
+ u8 one=1;
+ u8 regs;
+ u16 descnumbuffs[2] = {TX_RING_LEN, RX_RING_LEN};
+
+ /*
+ * Interrupts enabled
+ */
+
+ regs=inb(ioaddr+HOST_CTRL);
+ regs|=HOST_CTRL_INTE;
+ outb(regs, ioaddr+HOST_CTRL);
+
+ /*
+ * Allow ourselves to issue commands
+ */
+
+ up(&lp->cmd_mutex);
+
+
+ /*
+ * Send the indications on command
+ */
+
+ mc32_command(dev, 4, &one, 2);
+
+ /*
+ * Poke it to make sure it's really dead.
+ */
+
+ mc32_halt_transceiver(dev);
+ mc32_flush_tx_ring(dev);
+
+ /*
+ * Ask card to set up on-card descriptors to our spec
+ */
+
+ if(mc32_command(dev, 8, descnumbuffs, 4)) {
+ printk("%s: %s rejected our buffer configuration!\n",
+ dev->name, cardname);
+ mc32_close(dev);
+ return -ENOBUFS;
+ }
+
+ /* Report new configuration */
+ mc32_command(dev, 6, NULL, 0);
+
+ lp->tx_chain = lp->exec_box->data[8]; /* Transmit list start offset */
+ lp->rx_chain = lp->exec_box->data[10]; /* Receive list start offset */
+ lp->tx_len = lp->exec_box->data[9]; /* Transmit list count */
+ lp->rx_len = lp->exec_box->data[11]; /* Receive list count */
+
+ /* Set Network Address */
+ mc32_command(dev, 1, dev->dev_addr, 6);
+
+ /* Set the filters */
+ mc32_set_multicast_list(dev);
+
+ if (WORKAROUND_82586) {
+ u16 zero_word=0;
+ mc32_command(dev, 0x0D, &zero_word, 2); /* 82586 bug workaround on */
+ }
+
+ mc32_load_tx_ring(dev);
+
+ if(mc32_load_rx_ring(dev))
+ {
+ mc32_close(dev);
+ return -ENOBUFS;
+ }
+
+ lp->xceiver_desired_state = RUNNING;
+
+ /* And finally, set the ball rolling... */
+ mc32_start_transceiver(dev);
+
+ netif_start_queue(dev);
+
+ return 0;
+}
+
+
+/**
+ * mc32_timeout - handle a timeout from the network layer
+ * @dev: 3c527 that timed out
+ *
+ * Handle a timeout on transmit from the 3c527. This normally means
+ * bad things as the hardware handles cable timeouts and mess for
+ * us.
+ *
+ */
+
+static void mc32_timeout(struct net_device *dev)
+{
+ printk(KERN_WARNING "%s: transmit timed out?\n", dev->name);
+ /* Try to restart the adaptor. */
+ netif_wake_queue(dev);
+}
+
+
+/**
+ * mc32_send_packet - queue a frame for transmit
+ * @skb: buffer to transmit
+ * @dev: 3c527 to send it out of
+ *
+ * Transmit a buffer. This normally means throwing the buffer onto
+ * the transmit queue as the queue is quite large. If the queue is
+ * full then we set tx_busy and return. Once the interrupt handler
+ * gets messages telling it to reclaim transmit queue entries, we will
+ * clear tx_busy and the kernel will start calling this again.
+ *
+ * We do not disable interrupts or acquire any locks; this can
+ * run concurrently with mc32_tx_ring(), and the function itself
+ * is serialised at a higher layer. However, similarly for the
+ * card itself, we must ensure that we update tx_ring_head only
+ * after we've established a valid packet on the tx ring (and
+ * before we let the card "see" it, to prevent it racing with the
+ * irq handler).
+ *
+ */
+
+static int mc32_send_packet(struct sk_buff *skb, struct net_device *dev)
+{
+ struct mc32_local *lp = netdev_priv(dev);
+ u32 head = atomic_read(&lp->tx_ring_head);
+
+ volatile struct skb_header *p, *np;
+
+ netif_stop_queue(dev);
+
+ if(atomic_read(&lp->tx_count)==0) {
+ return 1;
+ }
+
+ skb = skb_padto(skb, ETH_ZLEN);
+ if (skb == NULL) {
+ netif_wake_queue(dev);
+ return 0;
+ }
+
+ atomic_dec(&lp->tx_count);
+
+ /* P is the last sending/sent buffer as a pointer */
+ p=lp->tx_ring[head].p;
+
+ head = next_tx(head);
+
+ /* NP is the buffer we will be loading */
+ np=lp->tx_ring[head].p;
+
+ /* We will need this to flush the buffer out */
+ lp->tx_ring[head].skb=skb;
+
+ np->length = unlikely(skb->len < ETH_ZLEN) ? ETH_ZLEN : skb->len;
+ np->data = isa_virt_to_bus(skb->data);
+ np->status = 0;
+ np->control = CONTROL_EOP | CONTROL_EOL;
+ wmb();
+
+ /*
+ * The new frame has been setup; we can now
+ * let the interrupt handler and card "see" it
+ */
+
+ atomic_set(&lp->tx_ring_head, head);
+ p->control &= ~CONTROL_EOL;
+
+ netif_wake_queue(dev);
+ return 0;
+}
+
+
+/**
+ * mc32_update_stats - pull off the on board statistics
+ * @dev: 3c527 to service
+ *
+ *
+ * Query and reset the on-card stats. There's the small possibility
+ * of a race here, which would result in an underestimation of
+ * actual errors. As such, we'd prefer to keep all our stats
+ * collection in software. As a rule, we do. However it can't be
+ * used for rx errors and collisions as, by default, the card discards
+ * bad rx packets.
+ *
+ * Setting the SAV BP in the rx filter command supposedly
+ * stops this behaviour. However, testing shows that it only seems to
+ * enable the collation of on-card rx statistics --- the driver
+ * never sees an RX descriptor with an error status set.
+ *
+ */
+
+static void mc32_update_stats(struct net_device *dev)
+{
+ struct mc32_local *lp = netdev_priv(dev);
+ volatile struct mc32_stats *st = lp->stats;
+
+ u32 rx_errors=0;
+
+ rx_errors+=lp->net_stats.rx_crc_errors +=st->rx_crc_errors;
+ st->rx_crc_errors=0;
+ rx_errors+=lp->net_stats.rx_fifo_errors +=st->rx_overrun_errors;
+ st->rx_overrun_errors=0;
+ rx_errors+=lp->net_stats.rx_frame_errors +=st->rx_alignment_errors;
+ st->rx_alignment_errors=0;
+ rx_errors+=lp->net_stats.rx_length_errors+=st->rx_tooshort_errors;
+ st->rx_tooshort_errors=0;
+ rx_errors+=lp->net_stats.rx_missed_errors+=st->rx_outofresource_errors;
+ st->rx_outofresource_errors=0;
+ lp->net_stats.rx_errors=rx_errors;
+
+ /* Number of packets which saw one collision */
+ lp->net_stats.collisions+=st->dataC[10];
+ st->dataC[10]=0;
+
+ /* Number of packets which saw 2--15 collisions */
+ lp->net_stats.collisions+=st->dataC[11];
+ st->dataC[11]=0;
+}
+
+
+/**
+ * mc32_rx_ring - process the receive ring
+ * @dev: 3c527 that needs its receive ring processing
+ *
+ *
+ * We have received one or more indications from the card that a
+ * receive has completed. The buffer ring thus contains dirty
+ * entries. We walk the ring by iterating over the circular rx_ring
+ * array, starting at the next dirty buffer (which happens to be the
+ * one we finished up at last time around).
+ *
+ * For each completed packet, we will either copy it and pass it up
+ * the stack or, if the packet is near MTU sized, we allocate
+ * another buffer and flip the old one up the stack.
+ *
+ * We must succeed in keeping a buffer on the ring. If necessary we
+ * will toss a received packet rather than lose a ring entry. Once
+ * the first uncompleted descriptor is found, we move the
+ * End-Of-List bit to include the buffers just processed.
+ *
+ */
+
+static void mc32_rx_ring(struct net_device *dev)
+{
+ struct mc32_local *lp = netdev_priv(dev);
+ volatile struct skb_header *p;
+ u16 rx_ring_tail;
+ u16 rx_old_tail;
+ int x=0;
+
+ rx_old_tail = rx_ring_tail = lp->rx_ring_tail;
+
+ do
+ {
+ p=lp->rx_ring[rx_ring_tail].p;
+
+ if(!(p->status & (1<<7))) { /* Not COMPLETED */
+ break;
+ }
+ if(p->status & (1<<6)) /* COMPLETED_OK */
+ {
+
+ u16 length=p->length;
+ struct sk_buff *skb;
+ struct sk_buff *newskb;
+
+ /* Try to save time by avoiding a copy on big frames */
+
+ if ((length > RX_COPYBREAK)
+ && ((newskb=dev_alloc_skb(1532)) != NULL))
+ {
+ skb=lp->rx_ring[rx_ring_tail].skb;
+ skb_put(skb, length);
+
+ skb_reserve(newskb,18);
+ lp->rx_ring[rx_ring_tail].skb=newskb;
+ p->data=isa_virt_to_bus(newskb->data);
+ }
+ else
+ {
+ skb=dev_alloc_skb(length+2);
+
+ if(skb==NULL) {
+ lp->net_stats.rx_dropped++;
+ goto dropped;
+ }
+
+ skb_reserve(skb,2);
+ memcpy(skb_put(skb, length),
+ lp->rx_ring[rx_ring_tail].skb->data, length);
+ }
+
+ skb->protocol=eth_type_trans(skb,dev);
+ skb->dev=dev;
+ dev->last_rx = jiffies;
+ lp->net_stats.rx_packets++;
+ lp->net_stats.rx_bytes += length;
+ netif_rx(skb);
+ }
+
+ dropped:
+ p->length = 1532;
+ p->status = 0;
+
+ rx_ring_tail=next_rx(rx_ring_tail);
+ }
+ while(x++<48);
+
+ /* If there was actually a frame to be processed, place the EOL bit */
+ /* at the descriptor prior to the one to be filled next */
+
+ if (rx_ring_tail != rx_old_tail)
+ {
+ lp->rx_ring[prev_rx(rx_ring_tail)].p->control |= CONTROL_EOL;
+ lp->rx_ring[prev_rx(rx_old_tail)].p->control &= ~CONTROL_EOL;
+
+ lp->rx_ring_tail=rx_ring_tail;
+ }
+}
+
+
+/**
+ * mc32_tx_ring - process completed transmits
+ * @dev: 3c527 that needs its transmit ring processing
+ *
+ *
+ * This operates in a similar fashion to mc32_rx_ring. We iterate
+ * over the transmit ring. For each descriptor which has been
+ * processed by the card, we free its associated buffer and note
+ * any errors. This continues until the transmit ring is emptied
+ * or we reach a descriptor that hasn't yet been processed by the
+ * card.
+ *
+ */
+
+static void mc32_tx_ring(struct net_device *dev)
+{
+ struct mc32_local *lp = netdev_priv(dev);
+ volatile struct skb_header *np;
+
+ /*
+ * We rely on head==tail to mean 'queue empty'.
+ * This is why lp->tx_count=TX_RING_LEN-1: in order to prevent
+ * tx_ring_head wrapping to tail and confusing a 'queue empty'
+ * condition with 'queue full'
+ */
+
+ while (lp->tx_ring_tail != atomic_read(&lp->tx_ring_head))
+ {
+ u16 t;
+
+ t=next_tx(lp->tx_ring_tail);
+ np=lp->tx_ring[t].p;
+
+ if(!(np->status & (1<<7)))
+ {
+ /* Not COMPLETED */
+ break;
+ }
+ lp->net_stats.tx_packets++;
+ if(!(np->status & (1<<6))) /* Not COMPLETED_OK */
+ {
+ lp->net_stats.tx_errors++;
+
+ switch(np->status&0x0F)
+ {
+ case 1:
+ lp->net_stats.tx_aborted_errors++;
+ break; /* Max collisions */
+ case 2:
+ lp->net_stats.tx_fifo_errors++;
+ break;
+ case 3:
+ lp->net_stats.tx_carrier_errors++;
+ break;
+ case 4:
+ lp->net_stats.tx_window_errors++;
+ break; /* CTS Lost */
+ case 5:
+ lp->net_stats.tx_aborted_errors++;
+ break; /* Transmit timeout */
+ }
+ }
+ /* Packets are sent in order - this is
+ basically a FIFO queue of buffers matching
+ the card ring */
+ lp->net_stats.tx_bytes+=lp->tx_ring[t].skb->len;
+ dev_kfree_skb_irq(lp->tx_ring[t].skb);
+ lp->tx_ring[t].skb=NULL;
+ atomic_inc(&lp->tx_count);
+ netif_wake_queue(dev);
+
+ lp->tx_ring_tail=t;
+ }
+
+}
+
+
+/**
+ * mc32_interrupt - handle an interrupt from a 3c527
+ * @irq: Interrupt number
+ * @dev_id: 3c527 that requires servicing
+ * @regs: Registers (unused)
+ *
+ *
+ * An interrupt is raised whenever the 3c527 writes to the command
+ * register. This register contains the message it wishes to send us
+ * packed into a single byte field. We keep reading status entries
+ * until we have processed all the control items, but simply count
+ * transmit and receive reports. When all reports are in we empty the
+ * transceiver rings as appropriate. This saves the overhead of
+ * multiple command requests.
+ *
+ * Because MCA is level-triggered, we shouldn't miss indications.
+ * Therefore, we needn't ask the card to suspend interrupts within
+ * this handler. The card receives an implicit acknowledgment of the
+ * current interrupt when we read the command register.
+ *
+ */
+
+static irqreturn_t mc32_interrupt(int irq, void *dev_id, struct pt_regs * regs)
+{
+ struct net_device *dev = dev_id;
+ struct mc32_local *lp;
+ int ioaddr, status, boguscount = 0;
+ int rx_event = 0;
+ int tx_event = 0;
+
+ if (dev == NULL) {
+ printk(KERN_WARNING "%s: irq %d for unknown device.\n", cardname, irq);
+ return IRQ_NONE;
+ }
+
+ ioaddr = dev->base_addr;
+ lp = netdev_priv(dev);
+
+ /* See whats cooking */
+
+ while((inb(ioaddr+HOST_STATUS)&HOST_STATUS_CWR) && boguscount++<2000)
+ {
+ status=inb(ioaddr+HOST_CMD);
+
+#ifdef DEBUG_IRQ
+ printk("Status TX%d RX%d EX%d OV%d BC%d\n",
+ (status&7), (status>>3)&7, (status>>6)&1,
+ (status>>7)&1, boguscount);
+#endif
+
+ switch(status&7)
+ {
+ case 0:
+ break;
+ case 6: /* TX fail */
+ case 2: /* TX ok */
+ tx_event = 1;
+ break;
+ case 3: /* Halt */
+ case 4: /* Abort */
+ complete(&lp->xceiver_cmd);
+ break;
+ default:
+ printk("%s: strange tx ack %d\n", dev->name, status&7);
+ }
+ status>>=3;
+ switch(status&7)
+ {
+ case 0:
+ break;
+ case 2: /* RX */
+ rx_event=1;
+ break;
+ case 3: /* Halt */
+ case 4: /* Abort */
+ complete(&lp->xceiver_cmd);
+ break;
+ case 6:
+ /* Out of RX buffers stat */
+ /* Must restart rx */
+ lp->net_stats.rx_dropped++;
+ mc32_rx_ring(dev);
+ mc32_start_transceiver(dev);
+ break;
+ default:
+ printk("%s: strange rx ack %d\n",
+ dev->name, status&7);
+ }
+ status>>=3;
+ if(status&1)
+ {
+ /*
+ * No thread is waiting: we need to tidy
+ * up ourself.
+ */
+
+ if (lp->cmd_nonblocking) {
+ up(&lp->cmd_mutex);
+ if (lp->mc_reload_wait)
+ mc32_reset_multicast_list(dev);
+ }
+ else complete(&lp->execution_cmd);
+ }
+ if(status&2)
+ {
+ /*
+ * We get interrupted once per
+ * counter that is about to overflow.
+ */
+
+ mc32_update_stats(dev);
+ }
+ }
+
+
+ /*
+ * Process the transmit and receive rings
+ */
+
+ if(tx_event)
+ mc32_tx_ring(dev);
+
+ if(rx_event)
+ mc32_rx_ring(dev);
+
+ return IRQ_HANDLED;
+}
+
+
+/**
+ * mc32_close - user configuring the 3c527 down
+ * @dev: 3c527 card to shut down
+ *
+ * The 3c527 is a bus mastering device. We must be careful how we
+ * shut it down. It may also be running shared interrupt so we have
+ * to be sure to silence it properly
+ *
+ * We indicate that the card is closing to the rest of the
+ * driver. Otherwise, it is possible that the card may run out
+ * of receive buffers and restart the transceiver while we're
+ * trying to close it.
+ *
+ * We abort any receive and transmits going on and then wait until
+ * any pending exec commands have completed in other code threads.
+ * In theory we can't get here while that is true, in practice I am
+ * paranoid
+ *
+ * We turn off the interrupt enable for the board to be sure it can't
+ * intefere with other devices.
+ */
+
+static int mc32_close(struct net_device *dev)
+{
+ struct mc32_local *lp = netdev_priv(dev);
+ int ioaddr = dev->base_addr;
+
+ u8 regs;
+ u16 one=1;
+
+ lp->xceiver_desired_state = HALTED;
+ netif_stop_queue(dev);
+
+ /*
+ * Send the indications on command (handy debug check)
+ */
+
+ mc32_command(dev, 4, &one, 2);
+
+ /* Shut down the transceiver */
+
+ mc32_halt_transceiver(dev);
+
+ /* Ensure we issue no more commands beyond this point */
+
+ down(&lp->cmd_mutex);
+
+ /* Ok the card is now stopping */
+
+ regs=inb(ioaddr+HOST_CTRL);
+ regs&=~HOST_CTRL_INTE;
+ outb(regs, ioaddr+HOST_CTRL);
+
+ mc32_flush_rx_ring(dev);
+ mc32_flush_tx_ring(dev);
+
+ mc32_update_stats(dev);
+
+ return 0;
+}
+
+
+/**
+ * mc32_get_stats - hand back stats to network layer
+ * @dev: The 3c527 card to handle
+ *
+ * We've collected all the stats we can in software already. Now
+ * it's time to update those kept on-card and return the lot.
+ *
+ */
+
+static struct net_device_stats *mc32_get_stats(struct net_device *dev)
+{
+ struct mc32_local *lp = netdev_priv(dev);
+
+ mc32_update_stats(dev);
+ return &lp->net_stats;
+}
+
+
+/**
+ * do_mc32_set_multicast_list - attempt to update multicasts
+ * @dev: 3c527 device to load the list on
+ * @retry: indicates this is not the first call.
+ *
+ *
+ * Actually set or clear the multicast filter for this adaptor. The
+ * locking issues are handled by this routine. We have to track
+ * state as it may take multiple calls to get the command sequence
+ * completed. We just keep trying to schedule the loads until we
+ * manage to process them all.
+ *
+ * num_addrs == -1 Promiscuous mode, receive all packets
+ *
+ * num_addrs == 0 Normal mode, clear multicast list
+ *
+ * num_addrs > 0 Multicast mode, receive normal and MC packets,
+ * and do best-effort filtering.
+ *
+ * See mc32_update_stats() regards setting the SAV BP bit.
+ *
+ */
+
+static void do_mc32_set_multicast_list(struct net_device *dev, int retry)
+{
+ struct mc32_local *lp = netdev_priv(dev);
+ u16 filt = (1<<2); /* Save Bad Packets, for stats purposes */
+
+ if (dev->flags&IFF_PROMISC)
+ /* Enable promiscuous mode */
+ filt |= 1;
+ else if((dev->flags&IFF_ALLMULTI) || dev->mc_count > 10)
+ {
+ dev->flags|=IFF_PROMISC;
+ filt |= 1;
+ }
+ else if(dev->mc_count)
+ {
+ unsigned char block[62];
+ unsigned char *bp;
+ struct dev_mc_list *dmc=dev->mc_list;
+
+ int i;
+
+ if(retry==0)
+ lp->mc_list_valid = 0;
+ if(!lp->mc_list_valid)
+ {
+ block[1]=0;
+ block[0]=dev->mc_count;
+ bp=block+2;
+
+ for(i=0;i<dev->mc_count;i++)
+ {
+ memcpy(bp, dmc->dmi_addr, 6);
+ bp+=6;
+ dmc=dmc->next;
+ }
+ if(mc32_command_nowait(dev, 2, block, 2+6*dev->mc_count)==-1)
+ {
+ lp->mc_reload_wait = 1;
+ return;
+ }
+ lp->mc_list_valid=1;
+ }
+ }
+
+ if(mc32_command_nowait(dev, 0, &filt, 2)==-1)
+ {
+ lp->mc_reload_wait = 1;
+ }
+ else {
+ lp->mc_reload_wait = 0;
+ }
+}
+
+
+/**
+ * mc32_set_multicast_list - queue multicast list update
+ * @dev: The 3c527 to use
+ *
+ * Commence loading the multicast list. This is called when the kernel
+ * changes the lists. It will override any pending list we are trying to
+ * load.
+ */
+
+static void mc32_set_multicast_list(struct net_device *dev)
+{
+ do_mc32_set_multicast_list(dev,0);
+}
+
+
+/**
+ * mc32_reset_multicast_list - reset multicast list
+ * @dev: The 3c527 to use
+ *
+ * Attempt the next step in loading the multicast lists. If this attempt
+ * fails to complete then it will be scheduled and this function called
+ * again later from elsewhere.
+ */
+
+static void mc32_reset_multicast_list(struct net_device *dev)
+{
+ do_mc32_set_multicast_list(dev,1);
+}
+
+static void netdev_get_drvinfo(struct net_device *dev,
+ struct ethtool_drvinfo *info)
+{
+ strcpy(info->driver, DRV_NAME);
+ strcpy(info->version, DRV_VERSION);
+ sprintf(info->bus_info, "MCA 0x%lx", dev->base_addr);
+}
+
+static u32 netdev_get_msglevel(struct net_device *dev)
+{
+ return mc32_debug;
+}
+
+static void netdev_set_msglevel(struct net_device *dev, u32 level)
+{
+ mc32_debug = level;
+}
+
+static struct ethtool_ops netdev_ethtool_ops = {
+ .get_drvinfo = netdev_get_drvinfo,
+ .get_msglevel = netdev_get_msglevel,
+ .set_msglevel = netdev_set_msglevel,
+};
+
+#ifdef MODULE
+
+static struct net_device *this_device;
+
+/**
+ * init_module - entry point
+ *
+ * Probe and locate a 3c527 card. This really should probe and locate
+ * all the 3c527 cards in the machine not just one of them. Yes you can
+ * insmod multiple modules for now but it's a hack.
+ */
+
+int init_module(void)
+{
+ this_device = mc32_probe(-1);
+ if (IS_ERR(this_device))
+ return PTR_ERR(this_device);
+ return 0;
+}
+
+/**
+ * cleanup_module - free resources for an unload
+ *
+ * Unloading time. We release the MCA bus resources and the interrupt
+ * at which point everything is ready to unload. The card must be stopped
+ * at this point or we would not have been called. When we unload we
+ * leave the card stopped but not totally shut down. When the card is
+ * initialized it must be rebooted or the rings reloaded before any
+ * transmit operations are allowed to start scribbling into memory.
+ */
+
+void cleanup_module(void)
+{
+ unregister_netdev(this_device);
+ cleanup_card(this_device);
+ free_netdev(this_device);
+}
+
+#endif /* MODULE */