summaryrefslogtreecommitdiffstats
path: root/drivers/net/appletalk/cops.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 00:20:36 +0200
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 00:20:36 +0200
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/net/appletalk/cops.c
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz
linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip
Linux-2.6.12-rc2v2.6.12-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!
Diffstat (limited to 'drivers/net/appletalk/cops.c')
-rw-r--r--drivers/net/appletalk/cops.c1059
1 files changed, 1059 insertions, 0 deletions
diff --git a/drivers/net/appletalk/cops.c b/drivers/net/appletalk/cops.c
new file mode 100644
index 000000000000..2161c2d585f0
--- /dev/null
+++ b/drivers/net/appletalk/cops.c
@@ -0,0 +1,1059 @@
+/* cops.c: LocalTalk driver for Linux.
+ *
+ * Authors:
+ * - Jay Schulist <jschlst@samba.org>
+ *
+ * With more than a little help from;
+ * - Alan Cox <Alan.Cox@linux.org>
+ *
+ * Derived from:
+ * - skeleton.c: A network driver outline for linux.
+ * Written 1993-94 by Donald Becker.
+ * - ltpc.c: A driver for the LocalTalk PC card.
+ * Written by Bradford W. Johnson.
+ *
+ * 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.
+ *
+ * Changes:
+ * 19970608 Alan Cox Allowed dual card type support
+ * Can set board type in insmod
+ * Hooks for cops_setup routine
+ * (not yet implemented).
+ * 19971101 Jay Schulist Fixes for multiple lt* devices.
+ * 19980607 Steven Hirsch Fixed the badly broken support
+ * for Tangent type cards. Only
+ * tested on Daystar LT200. Some
+ * cleanup of formatting and program
+ * logic. Added emacs 'local-vars'
+ * setup for Jay's brace style.
+ * 20000211 Alan Cox Cleaned up for softnet
+ */
+
+static const char *version =
+"cops.c:v0.04 6/7/98 Jay Schulist <jschlst@samba.org>\n";
+/*
+ * Sources:
+ * COPS Localtalk SDK. This provides almost all of the information
+ * needed.
+ */
+
+/*
+ * insmod/modprobe configurable stuff.
+ * - IO Port, choose one your card supports or 0 if you dare.
+ * - IRQ, also choose one your card supports or nothing and let
+ * the driver figure it out.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ptrace.h>
+#include <linux/ioport.h>
+#include <linux/in.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/if_arp.h>
+#include <linux/if_ltalk.h> /* For ltalk_setup() */
+#include <linux/delay.h> /* For udelay() */
+#include <linux/atalk.h>
+#include <linux/spinlock.h>
+#include <linux/bitops.h>
+
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+
+#include "cops.h" /* Our Stuff */
+#include "cops_ltdrv.h" /* Firmware code for Tangent type cards. */
+#include "cops_ffdrv.h" /* Firmware code for Dayna type cards. */
+
+/*
+ * The name of the card. Is used for messages and in the requests for
+ * io regions, irqs and dma channels
+ */
+
+static const char *cardname = "cops";
+
+#ifdef CONFIG_COPS_DAYNA
+static int board_type = DAYNA; /* Module exported */
+#else
+static int board_type = TANGENT;
+#endif
+
+static int io = 0x240; /* Default IO for Dayna */
+static int irq = 5; /* Default IRQ */
+
+/*
+ * COPS Autoprobe information.
+ * Right now if port address is right but IRQ is not 5 this will
+ * return a 5 no matter what since we will still get a status response.
+ * Need one more additional check to narrow down after we have gotten
+ * the ioaddr. But since only other possible IRQs is 3 and 4 so no real
+ * hurry on this. I *STRONGLY* recommend using IRQ 5 for your card with
+ * this driver.
+ *
+ * This driver has 2 modes and they are: Dayna mode and Tangent mode.
+ * Each mode corresponds with the type of card. It has been found
+ * that there are 2 main types of cards and all other cards are
+ * the same and just have different names or only have minor differences
+ * such as more IO ports. As this driver is tested it will
+ * become more clear on exactly what cards are supported. The driver
+ * defaults to using Dayna mode. To change the drivers mode, simply
+ * select Dayna or Tangent mode when configuring the kernel.
+ *
+ * This driver should support:
+ * TANGENT driver mode:
+ * Tangent ATB-II, Novell NL-1000, Daystar Digital LT-200,
+ * COPS LT-1
+ * DAYNA driver mode:
+ * Dayna DL2000/DaynaTalk PC (Half Length), COPS LT-95,
+ * Farallon PhoneNET PC III, Farallon PhoneNET PC II
+ * Other cards possibly supported mode unkown though:
+ * Dayna DL2000 (Full length), COPS LT/M (Micro-Channel)
+ *
+ * Cards NOT supported by this driver but supported by the ltpc.c
+ * driver written by Bradford W. Johnson <johns393@maroon.tc.umn.edu>
+ * Farallon PhoneNET PC
+ * Original Apple LocalTalk PC card
+ *
+ * N.B.
+ *
+ * The Daystar Digital LT200 boards do not support interrupt-driven
+ * IO. You must specify 'irq=0xff' as a module parameter to invoke
+ * polled mode. I also believe that the port probing logic is quite
+ * dangerous at best and certainly hopeless for a polled card. Best to
+ * specify both. - Steve H.
+ *
+ */
+
+/*
+ * Zero terminated list of IO ports to probe.
+ */
+
+static unsigned int ports[] = {
+ 0x240, 0x340, 0x200, 0x210, 0x220, 0x230, 0x260,
+ 0x2A0, 0x300, 0x310, 0x320, 0x330, 0x350, 0x360,
+ 0
+};
+
+/*
+ * Zero terminated list of IRQ ports to probe.
+ */
+
+static int cops_irqlist[] = {
+ 5, 4, 3, 0
+};
+
+static struct timer_list cops_timer;
+
+/* use 0 for production, 1 for verification, 2 for debug, 3 for verbose debug */
+#ifndef COPS_DEBUG
+#define COPS_DEBUG 1
+#endif
+static unsigned int cops_debug = COPS_DEBUG;
+
+/* The number of low I/O ports used by the card. */
+#define COPS_IO_EXTENT 8
+
+/* Information that needs to be kept for each board. */
+
+struct cops_local
+{
+ struct net_device_stats stats;
+ int board; /* Holds what board type is. */
+ int nodeid; /* Set to 1 once have nodeid. */
+ unsigned char node_acquire; /* Node ID when acquired. */
+ struct atalk_addr node_addr; /* Full node address */
+ spinlock_t lock; /* RX/TX lock */
+};
+
+/* Index to functions, as function prototypes. */
+static int cops_probe1 (struct net_device *dev, int ioaddr);
+static int cops_irq (int ioaddr, int board);
+
+static int cops_open (struct net_device *dev);
+static int cops_jumpstart (struct net_device *dev);
+static void cops_reset (struct net_device *dev, int sleep);
+static void cops_load (struct net_device *dev);
+static int cops_nodeid (struct net_device *dev, int nodeid);
+
+static irqreturn_t cops_interrupt (int irq, void *dev_id, struct pt_regs *regs);
+static void cops_poll (unsigned long ltdev);
+static void cops_timeout(struct net_device *dev);
+static void cops_rx (struct net_device *dev);
+static int cops_send_packet (struct sk_buff *skb, struct net_device *dev);
+static void set_multicast_list (struct net_device *dev);
+static int cops_hard_header (struct sk_buff *skb, struct net_device *dev,
+ unsigned short type, void *daddr, void *saddr,
+ unsigned len);
+
+static int cops_ioctl (struct net_device *dev, struct ifreq *rq, int cmd);
+static int cops_close (struct net_device *dev);
+static struct net_device_stats *cops_get_stats (struct net_device *dev);
+
+static void cleanup_card(struct net_device *dev)
+{
+ if (dev->irq)
+ free_irq(dev->irq, dev);
+ release_region(dev->base_addr, COPS_IO_EXTENT);
+}
+
+/*
+ * 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 in [1..0x1ff], always return failure.
+ * otherwise go with what we pass in.
+ */
+struct net_device * __init cops_probe(int unit)
+{
+ struct net_device *dev;
+ unsigned *port;
+ int base_addr;
+ int err = 0;
+
+ dev = alloc_netdev(sizeof(struct cops_local), "lt%d", ltalk_setup);
+ if (!dev)
+ return ERR_PTR(-ENOMEM);
+
+ if (unit >= 0) {
+ sprintf(dev->name, "lt%d", unit);
+ netdev_boot_setup_check(dev);
+ irq = dev->irq;
+ base_addr = dev->base_addr;
+ } else {
+ base_addr = dev->base_addr = io;
+ }
+
+ SET_MODULE_OWNER(dev);
+
+ if (base_addr > 0x1ff) { /* Check a single specified location. */
+ err = cops_probe1(dev, base_addr);
+ } else if (base_addr != 0) { /* Don't probe at all. */
+ err = -ENXIO;
+ } else {
+ /* FIXME Does this really work for cards which generate irq?
+ * It's definitely N.G. for polled Tangent. sh
+ * Dayna cards don't autoprobe well at all, but if your card is
+ * at IRQ 5 & IO 0x240 we find it every time. ;) JS
+ */
+ for (port = ports; *port && cops_probe1(dev, *port) < 0; port++)
+ ;
+ if (!*port)
+ err = -ENODEV;
+ }
+ 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);
+}
+
+/*
+ * 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 cops_probe1(struct net_device *dev, int ioaddr)
+{
+ struct cops_local *lp;
+ static unsigned version_printed;
+ int board = board_type;
+ int retval;
+
+ if(cops_debug && version_printed++ == 0)
+ printk("%s", version);
+
+ /* Grab the region so no one else tries to probe our ioports. */
+ if (!request_region(ioaddr, COPS_IO_EXTENT, dev->name))
+ return -EBUSY;
+
+ /*
+ * Since 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.
+ */
+ dev->irq = irq;
+ switch (dev->irq)
+ {
+ case 0:
+ /* COPS AutoIRQ routine */
+ dev->irq = cops_irq(ioaddr, board);
+ if (dev->irq)
+ break;
+ /* No IRQ found on this port, fallthrough */
+ case 1:
+ retval = -EINVAL;
+ goto err_out;
+
+ /* Fixup for users that don't know that IRQ 2 is really
+ * IRQ 9, or don't know which one to set.
+ */
+ case 2:
+ dev->irq = 9;
+ break;
+
+ /* Polled operation requested. Although irq of zero passed as
+ * a parameter tells the init routines to probe, we'll
+ * overload it to denote polled operation at runtime.
+ */
+ case 0xff:
+ dev->irq = 0;
+ break;
+
+ default:
+ break;
+ }
+
+ /* Reserve any actual interrupt. */
+ if (dev->irq) {
+ retval = request_irq(dev->irq, &cops_interrupt, 0, dev->name, dev);
+ if (retval)
+ goto err_out;
+ }
+
+ dev->base_addr = ioaddr;
+
+ lp = netdev_priv(dev);
+ memset(lp, 0, sizeof(struct cops_local));
+ spin_lock_init(&lp->lock);
+
+ /* Copy local board variable to lp struct. */
+ lp->board = board;
+
+ dev->hard_start_xmit = cops_send_packet;
+ dev->tx_timeout = cops_timeout;
+ dev->watchdog_timeo = HZ * 2;
+ dev->hard_header = cops_hard_header;
+ dev->get_stats = cops_get_stats;
+ dev->open = cops_open;
+ dev->stop = cops_close;
+ dev->do_ioctl = cops_ioctl;
+ dev->set_multicast_list = set_multicast_list;
+ dev->mc_list = NULL;
+
+ /* Tell the user where the card is and what mode we're in. */
+ if(board==DAYNA)
+ printk("%s: %s at %#3x, using IRQ %d, in Dayna mode.\n",
+ dev->name, cardname, ioaddr, dev->irq);
+ if(board==TANGENT) {
+ if(dev->irq)
+ printk("%s: %s at %#3x, IRQ %d, in Tangent mode\n",
+ dev->name, cardname, ioaddr, dev->irq);
+ else
+ printk("%s: %s at %#3x, using polled IO, in Tangent mode.\n",
+ dev->name, cardname, ioaddr);
+
+ }
+ return 0;
+
+err_out:
+ release_region(ioaddr, COPS_IO_EXTENT);
+ return retval;
+}
+
+static int __init cops_irq (int ioaddr, int board)
+{ /*
+ * This does not use the IRQ to determine where the IRQ is. We just
+ * assume that when we get a correct status response that it's the IRQ.
+ * This really just verifies the IO port but since we only have access
+ * to such a small number of IRQs (5, 4, 3) this is not bad.
+ * This will probably not work for more than one card.
+ */
+ int irqaddr=0;
+ int i, x, status;
+
+ if(board==DAYNA)
+ {
+ outb(0, ioaddr+DAYNA_RESET);
+ inb(ioaddr+DAYNA_RESET);
+ mdelay(333);
+ }
+ if(board==TANGENT)
+ {
+ inb(ioaddr);
+ outb(0, ioaddr);
+ outb(0, ioaddr+TANG_RESET);
+ }
+
+ for(i=0; cops_irqlist[i] !=0; i++)
+ {
+ irqaddr = cops_irqlist[i];
+ for(x = 0xFFFF; x>0; x --) /* wait for response */
+ {
+ if(board==DAYNA)
+ {
+ status = (inb(ioaddr+DAYNA_CARD_STATUS)&3);
+ if(status == 1)
+ return irqaddr;
+ }
+ if(board==TANGENT)
+ {
+ if((inb(ioaddr+TANG_CARD_STATUS)& TANG_TX_READY) !=0)
+ return irqaddr;
+ }
+ }
+ }
+ return 0; /* no IRQ found */
+}
+
+/*
+ * Open/initialize the board. This is called (in the current kernel)
+ * sometime after booting when the 'ifconfig' program is run.
+ */
+static int cops_open(struct net_device *dev)
+{
+ struct cops_local *lp = netdev_priv(dev);
+
+ if(dev->irq==0)
+ {
+ /*
+ * I don't know if the Dayna-style boards support polled
+ * operation. For now, only allow it for Tangent.
+ */
+ if(lp->board==TANGENT) /* Poll 20 times per second */
+ {
+ init_timer(&cops_timer);
+ cops_timer.function = cops_poll;
+ cops_timer.data = (unsigned long)dev;
+ cops_timer.expires = jiffies + HZ/20;
+ add_timer(&cops_timer);
+ }
+ else
+ {
+ printk(KERN_WARNING "%s: No irq line set\n", dev->name);
+ return -EAGAIN;
+ }
+ }
+
+ cops_jumpstart(dev); /* Start the card up. */
+
+ netif_start_queue(dev);
+ return 0;
+}
+
+/*
+ * This allows for a dynamic start/restart of the entire card.
+ */
+static int cops_jumpstart(struct net_device *dev)
+{
+ struct cops_local *lp = netdev_priv(dev);
+
+ /*
+ * Once the card has the firmware loaded and has acquired
+ * the nodeid, if it is reset it will lose it all.
+ */
+ cops_reset(dev,1); /* Need to reset card before load firmware. */
+ cops_load(dev); /* Load the firmware. */
+
+ /*
+ * If atalkd already gave us a nodeid we will use that
+ * one again, else we wait for atalkd to give us a nodeid
+ * in cops_ioctl. This may cause a problem if someone steals
+ * our nodeid while we are resetting.
+ */
+ if(lp->nodeid == 1)
+ cops_nodeid(dev,lp->node_acquire);
+
+ return 0;
+}
+
+static void tangent_wait_reset(int ioaddr)
+{
+ int timeout=0;
+
+ while(timeout++ < 5 && (inb(ioaddr+TANG_CARD_STATUS)&TANG_TX_READY)==0)
+ mdelay(1); /* Wait 1 second */
+}
+
+/*
+ * Reset the LocalTalk board.
+ */
+static void cops_reset(struct net_device *dev, int sleep)
+{
+ struct cops_local *lp = netdev_priv(dev);
+ int ioaddr=dev->base_addr;
+
+ if(lp->board==TANGENT)
+ {
+ inb(ioaddr); /* Clear request latch. */
+ outb(0,ioaddr); /* Clear the TANG_TX_READY flop. */
+ outb(0, ioaddr+TANG_RESET); /* Reset the adapter. */
+
+ tangent_wait_reset(ioaddr);
+ outb(0, ioaddr+TANG_CLEAR_INT);
+ }
+ if(lp->board==DAYNA)
+ {
+ outb(0, ioaddr+DAYNA_RESET); /* Assert the reset port */
+ inb(ioaddr+DAYNA_RESET); /* Clear the reset */
+ if(sleep)
+ {
+ long snap=jiffies;
+
+ /* Let card finish initializing, about 1/3 second */
+ while(jiffies-snap<HZ/3)
+ schedule();
+ }
+ else
+ mdelay(333);
+ }
+ netif_wake_queue(dev);
+ return;
+}
+
+static void cops_load (struct net_device *dev)
+{
+ struct ifreq ifr;
+ struct ltfirmware *ltf= (struct ltfirmware *)&ifr.ifr_ifru;
+ struct cops_local *lp = netdev_priv(dev);
+ int ioaddr=dev->base_addr;
+ int length, i = 0;
+
+ strcpy(ifr.ifr_name,"lt0");
+
+ /* Get card's firmware code and do some checks on it. */
+#ifdef CONFIG_COPS_DAYNA
+ if(lp->board==DAYNA)
+ {
+ ltf->length=sizeof(ffdrv_code);
+ ltf->data=ffdrv_code;
+ }
+ else
+#endif
+#ifdef CONFIG_COPS_TANGENT
+ if(lp->board==TANGENT)
+ {
+ ltf->length=sizeof(ltdrv_code);
+ ltf->data=ltdrv_code;
+ }
+ else
+#endif
+ {
+ printk(KERN_INFO "%s; unsupported board type.\n", dev->name);
+ return;
+ }
+
+ /* Check to make sure firmware is correct length. */
+ if(lp->board==DAYNA && ltf->length!=5983)
+ {
+ printk(KERN_WARNING "%s: Firmware is not length of FFDRV.BIN.\n", dev->name);
+ return;
+ }
+ if(lp->board==TANGENT && ltf->length!=2501)
+ {
+ printk(KERN_WARNING "%s: Firmware is not length of DRVCODE.BIN.\n", dev->name);
+ return;
+ }
+
+ if(lp->board==DAYNA)
+ {
+ /*
+ * We must wait for a status response
+ * with the DAYNA board.
+ */
+ while(++i<65536)
+ {
+ if((inb(ioaddr+DAYNA_CARD_STATUS)&3)==1)
+ break;
+ }
+
+ if(i==65536)
+ return;
+ }
+
+ /*
+ * Upload the firmware and kick. Byte-by-byte works nicely here.
+ */
+ i=0;
+ length = ltf->length;
+ while(length--)
+ {
+ outb(ltf->data[i], ioaddr);
+ i++;
+ }
+
+ if(cops_debug > 1)
+ printk("%s: Uploaded firmware - %d bytes of %d bytes.\n",
+ dev->name, i, ltf->length);
+
+ if(lp->board==DAYNA) /* Tell Dayna to run the firmware code. */
+ outb(1, ioaddr+DAYNA_INT_CARD);
+ else /* Tell Tang to run the firmware code. */
+ inb(ioaddr);
+
+ if(lp->board==TANGENT)
+ {
+ tangent_wait_reset(ioaddr);
+ inb(ioaddr); /* Clear initial ready signal. */
+ }
+
+ return;
+}
+
+/*
+ * Get the LocalTalk Nodeid from the card. We can suggest
+ * any nodeid 1-254. The card will try and get that exact
+ * address else we can specify 0 as the nodeid and the card
+ * will autoprobe for a nodeid.
+ */
+static int cops_nodeid (struct net_device *dev, int nodeid)
+{
+ struct cops_local *lp = netdev_priv(dev);
+ int ioaddr = dev->base_addr;
+
+ if(lp->board == DAYNA)
+ {
+ /* Empty any pending adapter responses. */
+ while((inb(ioaddr+DAYNA_CARD_STATUS)&DAYNA_TX_READY)==0)
+ {
+ outb(0, ioaddr+COPS_CLEAR_INT); /* Clear interrupts. */
+ if((inb(ioaddr+DAYNA_CARD_STATUS)&0x03)==DAYNA_RX_REQUEST)
+ cops_rx(dev); /* Kick any packets waiting. */
+ schedule();
+ }
+
+ outb(2, ioaddr); /* Output command packet length as 2. */
+ outb(0, ioaddr);
+ outb(LAP_INIT, ioaddr); /* Send LAP_INIT command byte. */
+ outb(nodeid, ioaddr); /* Suggest node address. */
+ }
+
+ if(lp->board == TANGENT)
+ {
+ /* Empty any pending adapter responses. */
+ while(inb(ioaddr+TANG_CARD_STATUS)&TANG_RX_READY)
+ {
+ outb(0, ioaddr+COPS_CLEAR_INT); /* Clear interrupt. */
+ cops_rx(dev); /* Kick out packets waiting. */
+ schedule();
+ }
+
+ /* Not sure what Tangent does if nodeid picked is used. */
+ if(nodeid == 0) /* Seed. */
+ nodeid = jiffies&0xFF; /* Get a random try */
+ outb(2, ioaddr); /* Command length LSB */
+ outb(0, ioaddr); /* Command length MSB */
+ outb(LAP_INIT, ioaddr); /* Send LAP_INIT byte */
+ outb(nodeid, ioaddr); /* LAP address hint. */
+ outb(0xFF, ioaddr); /* Int. level to use */
+ }
+
+ lp->node_acquire=0; /* Set nodeid holder to 0. */
+ while(lp->node_acquire==0) /* Get *True* nodeid finally. */
+ {
+ outb(0, ioaddr+COPS_CLEAR_INT); /* Clear any interrupt. */
+
+ if(lp->board == DAYNA)
+ {
+ if((inb(ioaddr+DAYNA_CARD_STATUS)&0x03)==DAYNA_RX_REQUEST)
+ cops_rx(dev); /* Grab the nodeid put in lp->node_acquire. */
+ }
+ if(lp->board == TANGENT)
+ {
+ if(inb(ioaddr+TANG_CARD_STATUS)&TANG_RX_READY)
+ cops_rx(dev); /* Grab the nodeid put in lp->node_acquire. */
+ }
+ schedule();
+ }
+
+ if(cops_debug > 1)
+ printk(KERN_DEBUG "%s: Node ID %d has been acquired.\n",
+ dev->name, lp->node_acquire);
+
+ lp->nodeid=1; /* Set got nodeid to 1. */
+
+ return 0;
+}
+
+/*
+ * Poll the Tangent type cards to see if we have work.
+ */
+
+static void cops_poll(unsigned long ltdev)
+{
+ int ioaddr, status;
+ int boguscount = 0;
+
+ struct net_device *dev = (struct net_device *)ltdev;
+
+ del_timer(&cops_timer);
+
+ if(dev == NULL)
+ return; /* We've been downed */
+
+ ioaddr = dev->base_addr;
+ do {
+ status=inb(ioaddr+TANG_CARD_STATUS);
+ if(status & TANG_RX_READY)
+ cops_rx(dev);
+ if(status & TANG_TX_READY)
+ netif_wake_queue(dev);
+ status = inb(ioaddr+TANG_CARD_STATUS);
+ } while((++boguscount < 20) && (status&(TANG_RX_READY|TANG_TX_READY)));
+
+ /* poll 20 times per second */
+ cops_timer.expires = jiffies + HZ/20;
+ add_timer(&cops_timer);
+
+ return;
+}
+
+/*
+ * The typical workload of the driver:
+ * Handle the network interface interrupts.
+ */
+static irqreturn_t cops_interrupt(int irq, void *dev_id, struct pt_regs * regs)
+{
+ struct net_device *dev = dev_id;
+ struct cops_local *lp;
+ int ioaddr, status;
+ int boguscount = 0;
+
+ ioaddr = dev->base_addr;
+ lp = netdev_priv(dev);
+
+ if(lp->board==DAYNA)
+ {
+ do {
+ outb(0, ioaddr + COPS_CLEAR_INT);
+ status=inb(ioaddr+DAYNA_CARD_STATUS);
+ if((status&0x03)==DAYNA_RX_REQUEST)
+ cops_rx(dev);
+ netif_wake_queue(dev);
+ } while(++boguscount < 20);
+ }
+ else
+ {
+ do {
+ status=inb(ioaddr+TANG_CARD_STATUS);
+ if(status & TANG_RX_READY)
+ cops_rx(dev);
+ if(status & TANG_TX_READY)
+ netif_wake_queue(dev);
+ status=inb(ioaddr+TANG_CARD_STATUS);
+ } while((++boguscount < 20) && (status&(TANG_RX_READY|TANG_TX_READY)));
+ }
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * We have a good packet(s), get it/them out of the buffers.
+ */
+static void cops_rx(struct net_device *dev)
+{
+ int pkt_len = 0;
+ int rsp_type = 0;
+ struct sk_buff *skb = NULL;
+ struct cops_local *lp = netdev_priv(dev);
+ int ioaddr = dev->base_addr;
+ int boguscount = 0;
+ unsigned long flags;
+
+
+ spin_lock_irqsave(&lp->lock, flags);
+
+ if(lp->board==DAYNA)
+ {
+ outb(0, ioaddr); /* Send out Zero length. */
+ outb(0, ioaddr);
+ outb(DATA_READ, ioaddr); /* Send read command out. */
+
+ /* Wait for DMA to turn around. */
+ while(++boguscount<1000000)
+ {
+ barrier();
+ if((inb(ioaddr+DAYNA_CARD_STATUS)&0x03)==DAYNA_RX_READY)
+ break;
+ }
+
+ if(boguscount==1000000)
+ {
+ printk(KERN_WARNING "%s: DMA timed out.\n",dev->name);
+ spin_unlock_irqrestore(&lp->lock, flags);
+ return;
+ }
+ }
+
+ /* Get response length. */
+ if(lp->board==DAYNA)
+ pkt_len = inb(ioaddr) & 0xFF;
+ else
+ pkt_len = inb(ioaddr) & 0x00FF;
+ pkt_len |= (inb(ioaddr) << 8);
+ /* Input IO code. */
+ rsp_type=inb(ioaddr);
+
+ /* Malloc up new buffer. */
+ skb = dev_alloc_skb(pkt_len);
+ if(skb == NULL)
+ {
+ printk(KERN_WARNING "%s: Memory squeeze, dropping packet.\n",
+ dev->name);
+ lp->stats.rx_dropped++;
+ while(pkt_len--) /* Discard packet */
+ inb(ioaddr);
+ spin_unlock_irqrestore(&lp->lock, flags);
+ return;
+ }
+ skb->dev = dev;
+ skb_put(skb, pkt_len);
+ skb->protocol = htons(ETH_P_LOCALTALK);
+
+ insb(ioaddr, skb->data, pkt_len); /* Eat the Data */
+
+ if(lp->board==DAYNA)
+ outb(1, ioaddr+DAYNA_INT_CARD); /* Interrupt the card */
+
+ spin_unlock_irqrestore(&lp->lock, flags); /* Restore interrupts. */
+
+ /* Check for bad response length */
+ if(pkt_len < 0 || pkt_len > MAX_LLAP_SIZE)
+ {
+ printk(KERN_WARNING "%s: Bad packet length of %d bytes.\n",
+ dev->name, pkt_len);
+ lp->stats.tx_errors++;
+ dev_kfree_skb_any(skb);
+ return;
+ }
+
+ /* Set nodeid and then get out. */
+ if(rsp_type == LAP_INIT_RSP)
+ { /* Nodeid taken from received packet. */
+ lp->node_acquire = skb->data[0];
+ dev_kfree_skb_any(skb);
+ return;
+ }
+
+ /* One last check to make sure we have a good packet. */
+ if(rsp_type != LAP_RESPONSE)
+ {
+ printk(KERN_WARNING "%s: Bad packet type %d.\n", dev->name, rsp_type);
+ lp->stats.tx_errors++;
+ dev_kfree_skb_any(skb);
+ return;
+ }
+
+ skb->mac.raw = skb->data; /* Point to entire packet. */
+ skb_pull(skb,3);
+ skb->h.raw = skb->data; /* Point to data (Skip header). */
+
+ /* Update the counters. */
+ lp->stats.rx_packets++;
+ lp->stats.rx_bytes += skb->len;
+
+ /* Send packet to a higher place. */
+ netif_rx(skb);
+ dev->last_rx = jiffies;
+}
+
+static void cops_timeout(struct net_device *dev)
+{
+ struct cops_local *lp = netdev_priv(dev);
+ int ioaddr = dev->base_addr;
+
+ lp->stats.tx_errors++;
+ if(lp->board==TANGENT)
+ {
+ if((inb(ioaddr+TANG_CARD_STATUS)&TANG_TX_READY)==0)
+ printk(KERN_WARNING "%s: No TX complete interrupt.\n", dev->name);
+ }
+ printk(KERN_WARNING "%s: Transmit timed out.\n", dev->name);
+ cops_jumpstart(dev); /* Restart the card. */
+ dev->trans_start = jiffies;
+ netif_wake_queue(dev);
+}
+
+
+/*
+ * Make the card transmit a LocalTalk packet.
+ */
+
+static int cops_send_packet(struct sk_buff *skb, struct net_device *dev)
+{
+ struct cops_local *lp = netdev_priv(dev);
+ int ioaddr = dev->base_addr;
+ unsigned long flags;
+
+ /*
+ * Block a timer-based transmit from overlapping.
+ */
+
+ netif_stop_queue(dev);
+
+ spin_lock_irqsave(&lp->lock, flags);
+ if(lp->board == DAYNA) /* Wait for adapter transmit buffer. */
+ while((inb(ioaddr+DAYNA_CARD_STATUS)&DAYNA_TX_READY)==0)
+ cpu_relax();
+ if(lp->board == TANGENT) /* Wait for adapter transmit buffer. */
+ while((inb(ioaddr+TANG_CARD_STATUS)&TANG_TX_READY)==0)
+ cpu_relax();
+
+ /* Output IO length. */
+ outb(skb->len, ioaddr);
+ if(lp->board == DAYNA)
+ outb(skb->len >> 8, ioaddr);
+ else
+ outb((skb->len >> 8)&0x0FF, ioaddr);
+
+ /* Output IO code. */
+ outb(LAP_WRITE, ioaddr);
+
+ if(lp->board == DAYNA) /* Check the transmit buffer again. */
+ while((inb(ioaddr+DAYNA_CARD_STATUS)&DAYNA_TX_READY)==0);
+
+ outsb(ioaddr, skb->data, skb->len); /* Send out the data. */
+
+ if(lp->board==DAYNA) /* Dayna requires you kick the card */
+ outb(1, ioaddr+DAYNA_INT_CARD);
+
+ spin_unlock_irqrestore(&lp->lock, flags); /* Restore interrupts. */
+
+ /* Done sending packet, update counters and cleanup. */
+ lp->stats.tx_packets++;
+ lp->stats.tx_bytes += skb->len;
+ dev->trans_start = jiffies;
+ dev_kfree_skb (skb);
+ return 0;
+}
+
+/*
+ * Dummy function to keep the Appletalk layer happy.
+ */
+
+static void set_multicast_list(struct net_device *dev)
+{
+ if(cops_debug >= 3)
+ printk("%s: set_multicast_list executed\n", dev->name);
+}
+
+/*
+ * Another Dummy function to keep the Appletalk layer happy.
+ */
+
+static int cops_hard_header(struct sk_buff *skb, struct net_device *dev,
+ unsigned short type, void *daddr, void *saddr,
+ unsigned len)
+{
+ if(cops_debug >= 3)
+ printk("%s: cops_hard_header executed. Wow!\n", dev->name);
+ return 0;
+}
+
+/*
+ * System ioctls for the COPS LocalTalk card.
+ */
+
+static int cops_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+ struct cops_local *lp = netdev_priv(dev);
+ struct sockaddr_at *sa = (struct sockaddr_at *)&ifr->ifr_addr;
+ struct atalk_addr *aa = (struct atalk_addr *)&lp->node_addr;
+
+ switch(cmd)
+ {
+ case SIOCSIFADDR:
+ /* Get and set the nodeid and network # atalkd wants. */
+ cops_nodeid(dev, sa->sat_addr.s_node);
+ aa->s_net = sa->sat_addr.s_net;
+ aa->s_node = lp->node_acquire;
+
+ /* Set broardcast address. */
+ dev->broadcast[0] = 0xFF;
+
+ /* Set hardware address. */
+ dev->dev_addr[0] = aa->s_node;
+ dev->addr_len = 1;
+ return 0;
+
+ case SIOCGIFADDR:
+ sa->sat_addr.s_net = aa->s_net;
+ sa->sat_addr.s_node = aa->s_node;
+ return 0;
+
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+/*
+ * The inverse routine to cops_open().
+ */
+
+static int cops_close(struct net_device *dev)
+{
+ struct cops_local *lp = netdev_priv(dev);
+
+ /* If we were running polled, yank the timer.
+ */
+ if(lp->board==TANGENT && dev->irq==0)
+ del_timer(&cops_timer);
+
+ netif_stop_queue(dev);
+ return 0;
+}
+
+/*
+ * Get the current statistics.
+ * This may be called with the card open or closed.
+ */
+static struct net_device_stats *cops_get_stats(struct net_device *dev)
+{
+ struct cops_local *lp = netdev_priv(dev);
+ return &lp->stats;
+}
+
+#ifdef MODULE
+static struct net_device *cops_dev;
+
+MODULE_LICENSE("GPL");
+module_param(io, int, 0);
+module_param(irq, int, 0);
+module_param(board_type, int, 0);
+
+int init_module(void)
+{
+ if (io == 0)
+ printk(KERN_WARNING "%s: You shouldn't autoprobe with insmod\n",
+ cardname);
+ cops_dev = cops_probe(-1);
+ if (IS_ERR(cops_dev))
+ return PTR_ERR(cops_dev);
+ return 0;
+}
+
+void cleanup_module(void)
+{
+ unregister_netdev(cops_dev);
+ cleanup_card(cops_dev);
+ free_netdev(cops_dev);
+}
+#endif /* MODULE */
+
+/*
+ * Local variables:
+ * compile-command: "gcc -DMODVERSIONS -DMODULE -D__KERNEL__ -Wall -Wstrict-prototypes -O2 -c cops.c"
+ * c-basic-offset: 4
+ * c-file-offsets: ((substatement-open . 0))
+ * End:
+ */