Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/drivers/net/isa-skeleton.c b/drivers/net/isa-skeleton.c
new file mode 100644
index 0000000..50bebb5
--- /dev/null
+++ b/drivers/net/isa-skeleton.c
@@ -0,0 +1,724 @@
+/* isa-skeleton.c: A network driver outline for linux.
+ *
+ * Written 1993-94 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 General Public License, incorporated herein by reference.
+ *
+ * The author may be reached as becker@scyld.com, or C/O
+ * Scyld Computing Corporation
+ * 410 Severn Ave., Suite 210
+ * Annapolis MD 21403
+ *
+ * This file is an outline for writing a network device driver for the
+ * the Linux operating system.
+ *
+ * To write (or understand) a driver, have a look at the "loopback.c" file to
+ * get a feel of what is going on, and then use the code below as a skeleton
+ * for the new driver.
+ *
+ */
+
+static const char *version =
+ "isa-skeleton.c:v1.51 9/24/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";
+
+/*
+ * Sources:
+ * List your sources of programming information to document that
+ * the driver is your own creation, and give due credit to others
+ * that contributed to the work. Remember that GNU project code
+ * cannot use proprietary or trade secret information. Interface
+ * definitions are generally considered non-copyrightable to the
+ * extent that the same names and structures must be used to be
+ * compatible.
+ *
+ * Finally, keep in mind that the Linux kernel is has an API, not
+ * ABI. Proprietary object-code-only distributions are not permitted
+ * under the GPL.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/in.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/spinlock.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/bitops.h>
+
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+
+/*
+ * The name of the card. Is used for messages and in the requests for
+ * io regions, irqs and dma channels
+ */
+static const char* cardname = "netcard";
+
+/* First, a few definitions that the brave might change. */
+
+/* A zero-terminated list of I/O addresses to be probed. */
+static unsigned int netcard_portlist[] __initdata =
+ { 0x200, 0x240, 0x280, 0x2C0, 0x300, 0x320, 0x340, 0};
+
+/* use 0 for production, 1 for verification, >2 for debug */
+#ifndef NET_DEBUG
+#define NET_DEBUG 2
+#endif
+static unsigned int net_debug = NET_DEBUG;
+
+/* The number of low I/O ports used by the ethercard. */
+#define NETCARD_IO_EXTENT 32
+
+#define MY_TX_TIMEOUT ((400*HZ)/1000)
+
+/* Information that need to be kept for each board. */
+struct net_local {
+ struct net_device_stats stats;
+ long open_time; /* Useless example local info. */
+
+ /* Tx control lock. This protects the transmit buffer ring
+ * state along with the "tx full" state of the driver. This
+ * means all netif_queue flow control actions are protected
+ * by this lock as well.
+ */
+ spinlock_t lock;
+};
+
+/* The station (ethernet) address prefix, used for IDing the board. */
+#define SA_ADDR0 0x00
+#define SA_ADDR1 0x42
+#define SA_ADDR2 0x65
+
+/* Index to functions, as function prototypes. */
+
+static int netcard_probe1(struct net_device *dev, int ioaddr);
+static int net_open(struct net_device *dev);
+static int net_send_packet(struct sk_buff *skb, struct net_device *dev);
+static irqreturn_t net_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+static void net_rx(struct net_device *dev);
+static int net_close(struct net_device *dev);
+static struct net_device_stats *net_get_stats(struct net_device *dev);
+static void set_multicast_list(struct net_device *dev);
+static void net_tx_timeout(struct net_device *dev);
+
+
+/* Example routines you must write ;->. */
+#define tx_done(dev) 1
+static void hardware_send_packet(short ioaddr, char *buf, int length);
+static void chipset_init(struct net_device *dev, int startp);
+
+/*
+ * Check for a network adaptor of this type, and return '0' iff one exists.
+ * If dev->base_addr == 0, probe all likely locations.
+ * If dev->base_addr == 1, always return failure.
+ * If dev->base_addr == 2, allocate space for the device and return success
+ * (detachable devices only).
+ */
+static int __init do_netcard_probe(struct net_device *dev)
+{
+ int i;
+ int base_addr = dev->base_addr;
+ int irq = dev->irq;
+
+ SET_MODULE_OWNER(dev);
+
+ if (base_addr > 0x1ff) /* Check a single specified location. */
+ return netcard_probe1(dev, base_addr);
+ else if (base_addr != 0) /* Don't probe at all. */
+ return -ENXIO;
+
+ for (i = 0; netcard_portlist[i]; i++) {
+ int ioaddr = netcard_portlist[i];
+ if (netcard_probe1(dev, ioaddr) == 0)
+ return 0;
+ dev->irq = irq;
+ }
+
+ return -ENODEV;
+}
+
+static void cleanup_card(struct net_device *dev)
+{
+#ifdef jumpered_dma
+ free_dma(dev->dma);
+#endif
+#ifdef jumpered_interrupts
+ free_irq(dev->irq, dev);
+#endif
+ release_region(dev->base_addr, NETCARD_IO_EXTENT);
+}
+
+#ifndef MODULE
+struct net_device * __init netcard_probe(int unit)
+{
+ struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
+ int err;
+
+ if (!dev)
+ return ERR_PTR(-ENOMEM);
+
+ sprintf(dev->name, "eth%d", unit);
+ netdev_boot_setup_check(dev);
+
+ err = do_netcard_probe(dev);
+ if (err)
+ goto out;
+ err = register_netdev(dev);
+ if (err)
+ goto out1;
+ return dev;
+out1:
+ cleanup_card(dev);
+out:
+ free_netdev(dev);
+ return ERR_PTR(err);
+}
+#endif
+
+/*
+ * This is the real probe routine. Linux has a history of friendly device
+ * probes on the ISA bus. A good device probes avoids doing writes, and
+ * verifies that the correct device exists and functions.
+ */
+static int __init netcard_probe1(struct net_device *dev, int ioaddr)
+{
+ struct net_local *np;
+ static unsigned version_printed;
+ int i;
+ int err = -ENODEV;
+
+ /* Grab the region so that no one else tries to probe our ioports. */
+ if (!request_region(ioaddr, NETCARD_IO_EXTENT, cardname))
+ return -EBUSY;
+
+ /*
+ * For ethernet adaptors the first three octets of the station address
+ * contains the manufacturer's unique code. That might be a good probe
+ * method. Ideally you would add additional checks.
+ */
+ if (inb(ioaddr + 0) != SA_ADDR0
+ || inb(ioaddr + 1) != SA_ADDR1
+ || inb(ioaddr + 2) != SA_ADDR2)
+ goto out;
+
+ if (net_debug && version_printed++ == 0)
+ printk(KERN_DEBUG "%s", version);
+
+ printk(KERN_INFO "%s: %s found at %#3x, ", dev->name, cardname, ioaddr);
+
+ /* Fill in the 'dev' fields. */
+ dev->base_addr = ioaddr;
+
+ /* Retrieve and print the ethernet address. */
+ for (i = 0; i < 6; i++)
+ printk(" %2.2x", dev->dev_addr[i] = inb(ioaddr + i));
+
+ err = -EAGAIN;
+#ifdef jumpered_interrupts
+ /*
+ * If this board has jumpered interrupts, allocate the interrupt
+ * vector now. There is no point in waiting since no other device
+ * can use the interrupt, and this marks the irq as busy. Jumpered
+ * interrupts are typically not reported by the boards, and we must
+ * used autoIRQ to find them.
+ */
+
+ if (dev->irq == -1)
+ ; /* Do nothing: a user-level program will set it. */
+ else if (dev->irq < 2) { /* "Auto-IRQ" */
+ unsigned long irq_mask = probe_irq_on();
+ /* Trigger an interrupt here. */
+
+ dev->irq = probe_irq_off(irq_mask);
+ if (net_debug >= 2)
+ printk(" autoirq is %d", dev->irq);
+ } else if (dev->irq == 2)
+ /*
+ * Fixup for users that don't know that IRQ 2 is really
+ * IRQ9, or don't know which one to set.
+ */
+ dev->irq = 9;
+
+ {
+ int irqval = request_irq(dev->irq, &net_interrupt, 0, cardname, dev);
+ if (irqval) {
+ printk("%s: unable to get IRQ %d (irqval=%d).\n",
+ dev->name, dev->irq, irqval);
+ goto out;
+ }
+ }
+#endif /* jumpered interrupt */
+#ifdef jumpered_dma
+ /*
+ * If we use a jumpered DMA channel, that should be probed for and
+ * allocated here as well. See lance.c for an example.
+ */
+ if (dev->dma == 0) {
+ if (request_dma(dev->dma, cardname)) {
+ printk("DMA %d allocation failed.\n", dev->dma);
+ goto out1;
+ } else
+ printk(", assigned DMA %d.\n", dev->dma);
+ } else {
+ short dma_status, new_dma_status;
+
+ /* Read the DMA channel status registers. */
+ dma_status = ((inb(DMA1_STAT_REG) >> 4) & 0x0f) |
+ (inb(DMA2_STAT_REG) & 0xf0);
+ /* Trigger a DMA request, perhaps pause a bit. */
+ outw(0x1234, ioaddr + 8);
+ /* Re-read the DMA status registers. */
+ new_dma_status = ((inb(DMA1_STAT_REG) >> 4) & 0x0f) |
+ (inb(DMA2_STAT_REG) & 0xf0);
+ /*
+ * Eliminate the old and floating requests,
+ * and DMA4 the cascade.
+ */
+ new_dma_status ^= dma_status;
+ new_dma_status &= ~0x10;
+ for (i = 7; i > 0; i--)
+ if (test_bit(i, &new_dma_status)) {
+ dev->dma = i;
+ break;
+ }
+ if (i <= 0) {
+ printk("DMA probe failed.\n");
+ goto out1;
+ }
+ if (request_dma(dev->dma, cardname)) {
+ printk("probed DMA %d allocation failed.\n", dev->dma);
+ goto out1;
+ }
+ }
+#endif /* jumpered DMA */
+
+ np = netdev_priv(dev);
+ spin_lock_init(&np->lock);
+
+ dev->open = net_open;
+ dev->stop = net_close;
+ dev->hard_start_xmit = net_send_packet;
+ dev->get_stats = net_get_stats;
+ dev->set_multicast_list = &set_multicast_list;
+
+ dev->tx_timeout = &net_tx_timeout;
+ dev->watchdog_timeo = MY_TX_TIMEOUT;
+ return 0;
+out1:
+#ifdef jumpered_interrupts
+ free_irq(dev->irq, dev);
+#endif
+out:
+ release_region(base_addr, NETCARD_IO_EXTENT);
+ return err;
+}
+
+static void net_tx_timeout(struct net_device *dev)
+{
+ struct net_local *np = netdev_priv(dev);
+
+ printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name,
+ tx_done(dev) ? "IRQ conflict" : "network cable problem");
+
+ /* Try to restart the adaptor. */
+ chipset_init(dev, 1);
+
+ np->stats.tx_errors++;
+
+ /* If we have space available to accept new transmit
+ * requests, wake up the queueing layer. This would
+ * be the case if the chipset_init() call above just
+ * flushes out the tx queue and empties it.
+ *
+ * If instead, the tx queue is retained then the
+ * netif_wake_queue() call should be placed in the
+ * TX completion interrupt handler of the driver instead
+ * of here.
+ */
+ if (!tx_full(dev))
+ netif_wake_queue(dev);
+}
+
+/*
+ * Open/initialize the board. This is called (in the current kernel)
+ * sometime after booting when the 'ifconfig' program is run.
+ *
+ * This routine should set everything up anew at each open, even
+ * registers that "should" only need to be set once at boot, so that
+ * there is non-reboot way to recover if something goes wrong.
+ */
+static int
+net_open(struct net_device *dev)
+{
+ struct net_local *np = netdev_priv(dev);
+ int ioaddr = dev->base_addr;
+ /*
+ * This is used if the interrupt line can turned off (shared).
+ * See 3c503.c for an example of selecting the IRQ at config-time.
+ */
+ if (request_irq(dev->irq, &net_interrupt, 0, cardname, dev)) {
+ return -EAGAIN;
+ }
+ /*
+ * Always allocate the DMA channel after the IRQ,
+ * and clean up on failure.
+ */
+ if (request_dma(dev->dma, cardname)) {
+ free_irq(dev->irq, dev);
+ return -EAGAIN;
+ }
+
+ /* Reset the hardware here. Don't forget to set the station address. */
+ chipset_init(dev, 1);
+ outb(0x00, ioaddr);
+ np->open_time = jiffies;
+
+ /* We are now ready to accept transmit requeusts from
+ * the queueing layer of the networking.
+ */
+ netif_start_queue(dev);
+
+ return 0;
+}
+
+/* This will only be invoked if your driver is _not_ in XOFF state.
+ * What this means is that you need not check it, and that this
+ * invariant will hold if you make sure that the netif_*_queue()
+ * calls are done at the proper times.
+ */
+static int net_send_packet(struct sk_buff *skb, struct net_device *dev)
+{
+ struct net_local *np = netdev_priv(dev);
+ int ioaddr = dev->base_addr;
+ short length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
+ unsigned char *buf = skb->data;
+
+ /* If some error occurs while trying to transmit this
+ * packet, you should return '1' from this function.
+ * In such a case you _may not_ do anything to the
+ * SKB, it is still owned by the network queueing
+ * layer when an error is returned. This means you
+ * may not modify any SKB fields, you may not free
+ * the SKB, etc.
+ */
+
+#if TX_RING
+ /* This is the most common case for modern hardware.
+ * The spinlock protects this code from the TX complete
+ * hardware interrupt handler. Queue flow control is
+ * thus managed under this lock as well.
+ */
+ spin_lock_irq(&np->lock);
+
+ add_to_tx_ring(np, skb, length);
+ dev->trans_start = jiffies;
+
+ /* If we just used up the very last entry in the
+ * TX ring on this device, tell the queueing
+ * layer to send no more.
+ */
+ if (tx_full(dev))
+ netif_stop_queue(dev);
+
+ /* When the TX completion hw interrupt arrives, this
+ * is when the transmit statistics are updated.
+ */
+
+ spin_unlock_irq(&np->lock);
+#else
+ /* This is the case for older hardware which takes
+ * a single transmit buffer at a time, and it is
+ * just written to the device via PIO.
+ *
+ * No spin locking is needed since there is no TX complete
+ * event. If by chance your card does have a TX complete
+ * hardware IRQ then you may need to utilize np->lock here.
+ */
+ hardware_send_packet(ioaddr, buf, length);
+ np->stats.tx_bytes += skb->len;
+
+ dev->trans_start = jiffies;
+
+ /* You might need to clean up and record Tx statistics here. */
+ if (inw(ioaddr) == /*RU*/81)
+ np->stats.tx_aborted_errors++;
+ dev_kfree_skb (skb);
+#endif
+
+ return 0;
+}
+
+#if TX_RING
+/* This handles TX complete events posted by the device
+ * via interrupts.
+ */
+void net_tx(struct net_device *dev)
+{
+ struct net_local *np = netdev_priv(dev);
+ int entry;
+
+ /* This protects us from concurrent execution of
+ * our dev->hard_start_xmit function above.
+ */
+ spin_lock(&np->lock);
+
+ entry = np->tx_old;
+ while (tx_entry_is_sent(np, entry)) {
+ struct sk_buff *skb = np->skbs[entry];
+
+ np->stats.tx_bytes += skb->len;
+ dev_kfree_skb_irq (skb);
+
+ entry = next_tx_entry(np, entry);
+ }
+ np->tx_old = entry;
+
+ /* If we had stopped the queue due to a "tx full"
+ * condition, and space has now been made available,
+ * wake up the queue.
+ */
+ if (netif_queue_stopped(dev) && ! tx_full(dev))
+ netif_wake_queue(dev);
+
+ spin_unlock(&np->lock);
+}
+#endif
+
+/*
+ * The typical workload of the driver:
+ * Handle the network interface interrupts.
+ */
+static irqreturn_t net_interrupt(int irq, void *dev_id, struct pt_regs * regs)
+{
+ struct net_device *dev = dev_id;
+ struct net_local *np;
+ int ioaddr, status;
+ int handled = 0;
+
+ ioaddr = dev->base_addr;
+
+ np = netdev_priv(dev);
+ status = inw(ioaddr + 0);
+
+ if (status == 0)
+ goto out;
+ handled = 1;
+
+ if (status & RX_INTR) {
+ /* Got a packet(s). */
+ net_rx(dev);
+ }
+#if TX_RING
+ if (status & TX_INTR) {
+ /* Transmit complete. */
+ net_tx(dev);
+ np->stats.tx_packets++;
+ netif_wake_queue(dev);
+ }
+#endif
+ if (status & COUNTERS_INTR) {
+ /* Increment the appropriate 'localstats' field. */
+ np->stats.tx_window_errors++;
+ }
+out:
+ return IRQ_RETVAL(handled);
+}
+
+/* We have a good packet(s), get it/them out of the buffers. */
+static void
+net_rx(struct net_device *dev)
+{
+ struct net_local *lp = netdev_priv(dev);
+ int ioaddr = dev->base_addr;
+ int boguscount = 10;
+
+ do {
+ int status = inw(ioaddr);
+ int pkt_len = inw(ioaddr);
+
+ if (pkt_len == 0) /* Read all the frames? */
+ break; /* Done for now */
+
+ if (status & 0x40) { /* There was an error. */
+ lp->stats.rx_errors++;
+ 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++;
+ } else {
+ /* Malloc up new buffer. */
+ struct sk_buff *skb;
+
+ lp->stats.rx_bytes+=pkt_len;
+
+ skb = dev_alloc_skb(pkt_len);
+ if (skb == NULL) {
+ printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n",
+ dev->name);
+ lp->stats.rx_dropped++;
+ break;
+ }
+ skb->dev = dev;
+
+ /* 'skb->data' points to the start of sk_buff data area. */
+ memcpy(skb_put(skb,pkt_len), (void*)dev->rmem_start,
+ pkt_len);
+ /* or */
+ insw(ioaddr, skb->data, (pkt_len + 1) >> 1);
+
+ netif_rx(skb);
+ dev->last_rx = jiffies;
+ lp->stats.rx_packets++;
+ lp->stats.rx_bytes += pkt_len;
+ }
+ } while (--boguscount);
+
+ return;
+}
+
+/* The inverse routine to net_open(). */
+static int
+net_close(struct net_device *dev)
+{
+ struct net_local *lp = netdev_priv(dev);
+ int ioaddr = dev->base_addr;
+
+ lp->open_time = 0;
+
+ netif_stop_queue(dev);
+
+ /* Flush the Tx and disable Rx here. */
+
+ disable_dma(dev->dma);
+
+ /* If not IRQ or DMA jumpered, free up the line. */
+ outw(0x00, ioaddr+0); /* Release the physical interrupt line. */
+
+ free_irq(dev->irq, dev);
+ free_dma(dev->dma);
+
+ /* Update the statistics here. */
+
+ return 0;
+
+}
+
+/*
+ * Get the current statistics.
+ * This may be called with the card open or closed.
+ */
+static struct net_device_stats *net_get_stats(struct net_device *dev)
+{
+ struct net_local *lp = netdev_priv(dev);
+ short ioaddr = dev->base_addr;
+
+ /* Update the statistics from the device registers. */
+ lp->stats.rx_missed_errors = inw(ioaddr+1);
+ return &lp->stats;
+}
+
+/*
+ * Set or clear the multicast filter for this adaptor.
+ * 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.
+ */
+static void
+set_multicast_list(struct net_device *dev)
+{
+ short ioaddr = dev->base_addr;
+ if (dev->flags&IFF_PROMISC)
+ {
+ /* Enable promiscuous mode */
+ outw(MULTICAST|PROMISC, ioaddr);
+ }
+ else if((dev->flags&IFF_ALLMULTI) || dev->mc_count > HW_MAX_ADDRS)
+ {
+ /* Disable promiscuous mode, use normal mode. */
+ hardware_set_filter(NULL);
+
+ outw(MULTICAST, ioaddr);
+ }
+ else if(dev->mc_count)
+ {
+ /* Walk the address list, and load the filter */
+ hardware_set_filter(dev->mc_list);
+
+ outw(MULTICAST, ioaddr);
+ }
+ else
+ outw(0, ioaddr);
+}
+
+#ifdef MODULE
+
+static struct net_device *this_device;
+static int io = 0x300;
+static int irq;
+static int dma;
+static int mem;
+MODULE_LICENSE("GPL");
+
+int init_module(void)
+{
+ struct net_device *dev;
+ int result;
+
+ if (io == 0)
+ printk(KERN_WARNING "%s: You shouldn't use auto-probing with insmod!\n",
+ cardname);
+ dev = alloc_etherdev(sizeof(struct net_local));
+ if (!dev)
+ return -ENOMEM;
+
+ /* Copy the parameters from insmod into the device structure. */
+ dev->base_addr = io;
+ dev->irq = irq;
+ dev->dma = dma;
+ dev->mem_start = mem;
+ if (do_netcard_probe(dev) == 0) {
+ if (register_netdev(dev) == 0)
+ this_device = dev;
+ return 0;
+ }
+ cleanup_card(dev);
+ }
+ free_netdev(dev);
+ return -ENXIO;
+}
+
+void
+cleanup_module(void)
+{
+ unregister_netdev(this_device);
+ cleanup_card(this_device);
+ free_netdev(this_device);
+}
+
+#endif /* MODULE */
+
+/*
+ * Local variables:
+ * compile-command:
+ * gcc -D__KERNEL__ -Wall -Wstrict-prototypes -Wwrite-strings
+ * -Wredundant-decls -O2 -m486 -c skeleton.c
+ * version-control: t
+ * kept-new-versions: 5
+ * tab-width: 4
+ * c-indent-level: 4
+ * End:
+ */