patch-2.1.53 linux/drivers/net/com90io.c
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- Lines: 1020
- Date:
Thu Sep 4 13:25:28 1997
- Orig file:
v2.1.52/linux/drivers/net/com90io.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.1.52/linux/drivers/net/com90io.c linux/drivers/net/com90io.c
@@ -0,0 +1,1019 @@
+/* com90io.c:
+ Written 1997 by David Woodhouse <dwmw2@cam.ac.uk>
+
+ Derived from the original arcnet.c,
+ Written 1994-1996 by Avery Pennarun,
+ which was in turn derived from skeleton.c by Donald Becker.
+
+ Contact Avery at: apenwarr@foxnet.net or
+ RR #5 Pole Line Road, Thunder Bay, ON, Canada P7C 5M9
+
+ **********************
+
+ The original copyright of skeleton.c was as follows:
+
+ skeleton.c Written 1993 by Donald Becker.
+ Copyright 1993 United States Government as represented by the
+ Director, National Security Agency. This software may only be used
+ and distributed according to the terms of the GNU Public License as
+ modified by SRC, incorporated herein by reference.
+
+ **********************
+
+ For more details, see drivers/net/arcnet.c
+
+ **********************
+*/
+
+
+#include <linux/module.h>
+#include <linux/config.h>
+#include <linux/version.h>
+
+#include <linux/kernel.h>
+#include <linux/sched.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/malloc.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/init.h>
+#include <linux/if_arcnet.h>
+#include <linux/arcdevice.h>
+
+#include <asm/system.h>
+#include <asm/bitops.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+
+#include <net/arp.h>
+
+
+
+
+
+/* External functions from arcnet.c */
+
+
+
+#if ARCNET_DEBUG_MAX & D_SKB
+extern void arcnet_dump_skb(struct device *dev,struct sk_buff *skb,
+ char *desc);
+#else
+#define arcnet_dump_skb(dev,skb,desc) ;
+#endif
+
+#if (ARCNET_DEBUG_MAX & D_RX) || (ARCNET_DEBUG_MAX & D_TX)
+extern void arcnet_dump_packet(struct device *dev,u_char *buffer,int ext,
+ char *desc);
+#else
+#define arcnet_dump_packet(dev,buffer,ext,desc) ;
+#endif
+extern void arcnet_tx_done(struct device *dev, struct arcnet_local *lp);
+extern void arcnet_makename(char *device);
+extern void arcnet_interrupt(int irq,void *dev_id,struct pt_regs *regs);
+extern void arcnet_setup(struct device *dev);
+extern int arcnet_go_tx(struct device *dev,int enable_irq);
+extern void arcnetA_continue_tx(struct device *dev);
+extern void arcnet_rx(struct arcnet_local *lp, u_char *arcsoft, short length, int saddr, int daddr);
+extern void arcnet_use_count(int open);
+
+
+/* Internal function declarations */
+
+static int arc90io_probe(struct device *dev);
+static void arc90io_rx(struct device *dev,int recbuf);
+static int arc90io_found(struct device *dev,int ioaddr,int airq);
+static void arc90io_inthandler (struct device *dev);
+static int arc90io_reset (struct device *dev, int reset_delay);
+static void arc90io_setmask (struct device *dev, u_char mask);
+static void arc90io_command (struct device *dev, u_char command);
+static u_char arc90io_status (struct device *dev);
+static void arc90io_prepare_tx(struct device *dev,u_char *hdr,int hdrlen,
+ char *data,int length,int daddr,int exceptA, int offset);
+static void arc90io_openclose(int open);
+
+static u_char get_buffer_byte (struct device *dev, unsigned offset);
+static void put_buffer_byte (struct device *dev, unsigned offset, u_char datum);
+static void get_whole_buffer (struct device *dev, unsigned offset, unsigned length, char *dest);
+static void put_whole_buffer (struct device *dev, unsigned offset, unsigned length, char *dest);
+
+
+/* Module parameters */
+
+#ifdef MODULE
+static int io=0x0; /* <--- EDIT THESE LINES FOR YOUR CONFIGURATION */
+static int irq=0; /* or use the insmod io= irq= shmem= options */
+static char *device; /* use eg. device="arc1" to change name */
+
+MODULE_PARM(io, "i");
+MODULE_PARM(irq, "i");
+MODULE_PARM(device, "s");
+#else
+__initfunc(void com90io_setup (char *str, int *ints));
+extern struct device arcnet_devs[];
+extern char arcnet_dev_names[][10];
+extern int arcnet_num_devs;
+#endif
+
+
+
+/* Handy defines for ARCnet specific stuff */
+
+/* The number of low I/O ports used by the ethercard. */
+#define ARCNET_TOTAL_SIZE 16
+
+ /* COM 9026 controller chip --> ARCnet register addresses */
+#define _INTMASK (ioaddr+0) /* writable */
+#define _STATUS (ioaddr+0) /* readable */
+#define _COMMAND (ioaddr+1) /* writable, returns random vals on read (?) */
+#define _RESET (ioaddr+8) /* software reset (on read) */
+#define _MEMDATA (ioaddr+12) /* Data port for IO-mapped memory */
+#define _ADDR_HI (ioaddr+15) /* Control registers for said */
+#define _ADDR_LO (ioaddr+14)
+#define _CONFIG (ioaddr+2) /* Configuration register */
+
+#define ARCSTATUS inb(_STATUS)
+#define ACOMMAND(cmd) outb((cmd),_COMMAND)
+#define AINTMASK(msk) outb((msk),_INTMASK)
+
+#define ARCRESET inb(_RESET)
+
+
+#define SETCONF outb((lp->config),_CONFIG)
+
+
+/****************************************************************************
+ * *
+ * IO-mapped operation routines *
+ * *
+ ****************************************************************************/
+
+u_char get_buffer_byte (struct device *dev, unsigned offset)
+{
+ int ioaddr=dev->base_addr;
+
+ outb(offset >> 8, _ADDR_HI);
+ outb(offset & 0xff, _ADDR_LO);
+
+ return inb(_MEMDATA);
+}
+
+void put_buffer_byte (struct device *dev, unsigned offset, u_char datum)
+{
+ int ioaddr=dev->base_addr;
+
+ outb(offset >> 8, _ADDR_HI);
+ outb(offset & 0xff, _ADDR_LO);
+
+ outb(datum, _MEMDATA);
+}
+
+
+#undef ONE_AT_A_TIME_TX
+#undef ONE_AT_A_TIME_RX
+
+void get_whole_buffer (struct device *dev, unsigned offset, unsigned length, char *dest)
+{
+ int ioaddr=dev->base_addr;
+
+ outb( (offset >> 8) | AUTOINCflag, _ADDR_HI);
+ outb( offset & 0xff, _ADDR_LO);
+
+ while (length--)
+#ifdef ONE_AT_A_TIME_RX
+ *(dest++) = get_buffer_byte(dev,offset++);
+#else
+ *(dest++) = inb (_MEMDATA);
+#endif
+}
+
+void put_whole_buffer (struct device *dev, unsigned offset, unsigned length, char *dest)
+{
+ int ioaddr=dev->base_addr;
+
+ outb( (offset >> 8) | AUTOINCflag, _ADDR_HI);
+ outb( offset & 0xff, _ADDR_LO);
+
+ while (length--)
+#ifdef ONE_AT_A_TIME_TX
+ put_buffer_byte(dev,offset++,*(dest++));
+#else
+ outb (*(dest++), _MEMDATA);
+#endif
+}
+
+
+static const char *version =
+ "com90io.c: v2.91 97/08/19 Avery Pennarun <apenwarr@bond.net> et al.\n";
+
+/****************************************************************************
+ * *
+ * Probe and initialization *
+ * *
+ ****************************************************************************/
+
+
+
+/* We cannot probe for an IO mapped card either, although we can check that
+ * it's where we were told it was, and even autoirq
+ */
+
+__initfunc(int arc90io_probe(struct device *dev))
+{
+ int ioaddr=dev->base_addr,status,delayval;
+ unsigned long airqmask;
+
+ BUGLVL(D_NORMAL) printk(version);
+
+ if (ioaddr<0x200)
+ {
+ BUGMSG(D_NORMAL,"No autoprobe for IO mapped cards; you "
+ "must specify the base address!\n");
+ return -ENODEV;
+ }
+
+ if (check_region(ioaddr, ARCNET_TOTAL_SIZE))
+ {
+ BUGMSG(D_INIT_REASONS,"IO check_region %x-%x failed.\n",
+ ioaddr,ioaddr+ARCNET_TOTAL_SIZE-1);
+ return -ENXIO;
+ }
+
+ if (ARCSTATUS == 0xFF)
+ {
+ BUGMSG(D_INIT_REASONS,"IO address %x empty\n",ioaddr);
+ return -ENODEV;
+ }
+
+ ARCRESET;
+ JIFFER(RESETtime);
+
+ status=ARCSTATUS;
+
+ if ((status & 0x9D)
+ != (NORXflag|RECONflag|TXFREEflag|RESETflag))
+ {
+ BUGMSG(D_INIT_REASONS,"Status invalid (%Xh).\n",status);
+ return -ENODEV;
+ }
+
+
+ BUGMSG(D_INIT_REASONS,"Status after reset: %X\n",status);
+
+
+ ACOMMAND(CFLAGScmd|RESETclear|CONFIGclear);
+
+ BUGMSG(D_INIT_REASONS,"Status after reset acknowledged: %X\n",status);
+
+ status=ARCSTATUS;
+
+ if (status & RESETflag)
+ {
+ BUGMSG(D_INIT_REASONS,"Eternal reset (status=%Xh)\n",status);
+ return -ENODEV;
+ }
+
+ outb((0x16 | IOMAPflag) &~ENABLE16flag, _CONFIG);
+
+
+ /* Read first loc'n of memory */
+
+ outb(AUTOINCflag ,_ADDR_HI);
+ outb(0,_ADDR_LO);
+
+ if ((status=inb(_MEMDATA)) != 0xd1)
+ {
+ BUGMSG(D_INIT_REASONS,"Signature byte not found"
+ " (%Xh instead).\n", status);
+ return -ENODEV;
+ }
+
+ if (!dev->irq)
+ {
+ /* if we do this, we're sure to get an IRQ since the
+ * card has just reset and the NORXflag is on until
+ * we tell it to start receiving.
+ */
+
+ airqmask = probe_irq_on();
+ outb(NORXflag,_INTMASK);
+ udelay(1);
+ outb(0,_INTMASK);
+ dev->irq = probe_irq_off(airqmask);
+
+ if (dev->irq<=0)
+ {
+ BUGMSG(D_INIT_REASONS,"Autoprobe IRQ failed\n");
+ return -ENODEV;
+ }
+ }
+
+ return arc90io_found(dev,dev->base_addr,dev->irq);
+}
+
+
+
+/* Set up the struct device associated with this card. Called after
+ * probing succeeds.
+ */
+__initfunc(int arc90io_found(struct device *dev,int ioaddr,int airq))
+{
+ struct arcnet_local *lp;
+
+ /* reserve the irq */
+ if (request_irq(airq,&arcnet_interrupt,0,"arcnet (COM90xx-IO)",NULL))
+ {
+ BUGMSG(D_NORMAL,"Can't get IRQ %d!\n",airq);
+ return -ENODEV;
+ }
+ irq2dev_map[airq]=dev;
+ dev->irq=airq;
+
+ /* reserve the I/O region - guaranteed to work by check_region */
+ request_region(ioaddr,ARCNET_TOTAL_SIZE,"arcnet (COM90xx-IO)");
+ dev->base_addr=ioaddr;
+
+
+ dev->mem_start=dev->mem_end=dev->rmem_start=dev->rmem_end=(long)NULL;
+
+
+ /* Initialize the rest of the device structure. */
+
+ dev->priv = kmalloc(sizeof(struct arcnet_local), GFP_KERNEL);
+ if (dev->priv == NULL)
+ {
+ irq2dev_map[airq] = NULL;
+ free_irq(airq,NULL);
+ release_region(ioaddr,ARCNET_TOTAL_SIZE);
+ return -ENOMEM;
+ }
+
+ memset(dev->priv,0,sizeof(struct arcnet_local));
+ lp=(struct arcnet_local *)(dev->priv);
+ lp->card_type = ARC_90xx_IO;
+ lp->card_type_str = "COM 90xx (IO)";
+
+ lp->arcnet_reset=arc90io_reset;
+ lp->asetmask=arc90io_setmask;
+ lp->astatus=arc90io_status;
+ lp->acommand=arc90io_command;
+ lp->openclose_device=arc90io_openclose;
+ lp->prepare_tx=arc90io_prepare_tx;
+ lp->inthandler=arc90io_inthandler;
+
+
+
+
+ /* Fill in the fields of the device structure with generic
+ * values.
+ */
+ arcnet_setup(dev);
+
+ /* And now fill particular fields with arcnet values */
+ dev->mtu=1500; /* completely arbitrary - agrees with ether, though */
+ dev->hard_header_len=sizeof(struct ClientData);
+ lp->sequence=1;
+ lp->recbuf=0;
+
+ BUGMSG(D_DURING,"ClientData header size is %d.\n",
+ sizeof(struct ClientData));
+ BUGMSG(D_DURING,"HardHeader size is %d.\n",
+ sizeof(struct archdr));
+
+ lp->config = (0x16 | IOMAPflag) & ~ENABLE16flag;
+ SETCONF;
+
+ /* get and check the station ID from offset 1 in shmem */
+
+ lp->stationid = get_buffer_byte(dev,1);
+
+ if (!lp->stationid)
+ BUGMSG(D_NORMAL,"WARNING! Station address 00 is reserved "
+ "for broadcasts!\n");
+ else if (lp->stationid==255)
+ BUGMSG(D_NORMAL,"WARNING! Station address FF may confuse "
+ "DOS networking programs!\n");
+ dev->dev_addr[0]=lp->stationid;
+
+ BUGMSG(D_NORMAL,"ARCnet COM90xx in IO-mapped mode: "
+ "station %02Xh found at %03lXh, IRQ %d.\n",
+ lp->stationid,
+ dev->base_addr,dev->irq);
+
+ return 0;
+}
+
+
+/****************************************************************************
+ * *
+ * Utility routines for arcnet.c *
+ * *
+ ****************************************************************************/
+
+/* Do a hardware reset on the card, and set up necessary registers.
+ *
+ * This should be called as little as possible, because it disrupts the
+ * token on the network (causes a RECON) and requires a significant delay.
+ *
+ * However, it does make sure the card is in a defined state.
+ */
+int arc90io_reset(struct device *dev,int reset_delay)
+{
+ struct arcnet_local *lp=(struct arcnet_local *)dev->priv;
+ short ioaddr=dev->base_addr;
+ int delayval,recbuf=lp->recbuf;
+
+ if (reset_delay==3)
+ {
+ ARCRESET;
+ return 0;
+ }
+
+ /* no IRQ's, please! */
+ lp->intmask=0;
+ SETMASK;
+
+ BUGMSG(D_INIT,"Resetting %s (status=%Xh)\n",
+ dev->name,ARCSTATUS);
+
+ /* Set the thing to IO-mapped, 8-bit mode */
+ lp->config = (0x1C|IOMAPflag) & ~ENABLE16flag;
+ SETCONF;
+
+ if (reset_delay)
+ {
+ /* reset the card */
+ ARCRESET;
+ JIFFER(RESETtime);
+ }
+
+ ACOMMAND(CFLAGScmd|RESETclear); /* clear flags & end reset */
+ ACOMMAND(CFLAGScmd|CONFIGclear);
+
+ /* verify that the ARCnet signature byte is present */
+
+ if (get_buffer_byte(dev,0) != TESTvalue)
+ {
+ BUGMSG(D_NORMAL,"reset failed: TESTvalue not present.\n");
+ return 1;
+ }
+
+ /* clear out status variables */
+ recbuf=lp->recbuf=0;
+ lp->txbuf=2;
+
+ /* enable extended (512-byte) packets */
+ ACOMMAND(CONFIGcmd|EXTconf);
+
+ /* and enable receive of our first packet to the first buffer */
+ EnableReceiver();
+
+ /* re-enable interrupts */
+ lp->intmask|=NORXflag;
+#ifdef DETECT_RECONFIGS
+ lp->intmask|=RECONflag;
+#endif
+ SETMASK;
+
+ /* done! return success. */
+ return 0;
+}
+
+
+static void arc90io_openclose(int open)
+{
+ if (open)
+ MOD_INC_USE_COUNT;
+ else
+ MOD_DEC_USE_COUNT;
+}
+
+
+
+static void arc90io_setmask(struct device *dev, u_char mask)
+{
+ short ioaddr=dev->base_addr;
+
+ AINTMASK(mask);
+}
+
+static u_char arc90io_status(struct device *dev)
+{
+ short ioaddr=dev->base_addr;
+
+ return ARCSTATUS;
+}
+
+static void arc90io_command(struct device *dev, u_char cmd)
+{
+ short ioaddr=dev->base_addr;
+
+ ACOMMAND(cmd);
+}
+
+
+/* The actual interrupt handler routine - handle various IRQ's generated
+ * by the card.
+ */
+static void
+arc90io_inthandler(struct device *dev)
+{
+ struct arcnet_local *lp=(struct arcnet_local *)dev->priv;
+ int ioaddr=dev->base_addr, status, boguscount = 3, didsomething;
+
+
+
+
+ AINTMASK(0);
+
+ BUGMSG(D_DURING,"in arc90io_inthandler (status=%Xh, intmask=%Xh)\n",
+ ARCSTATUS,lp->intmask);
+
+ do
+ {
+ status = ARCSTATUS;
+ didsomething=0;
+
+
+ /* RESET flag was enabled - card is resetting and if RX
+ * is disabled, it's NOT because we just got a packet.
+ */
+ if (status & RESETflag)
+ {
+ BUGMSG(D_NORMAL,"spurious reset (status=%Xh)\n",
+ status);
+ arc90io_reset(dev,0);
+
+ /* all other flag values are just garbage */
+ break;
+ }
+
+
+ /* RX is inhibited - we must have received something. */
+ if (status & lp->intmask & NORXflag)
+ {
+ int recbuf=lp->recbuf=!lp->recbuf;
+ int oldaddr=0;
+
+ BUGMSG(D_DURING,"receive irq (status=%Xh)\n",
+ status);
+
+ /* enable receive of our next packet */
+ EnableReceiver();
+
+ if (lp->intx)
+ oldaddr=(inb(_ADDR_HI)<<8) | inb(_ADDR_LO);
+
+
+ /* Got a packet. */
+ arc90io_rx(dev,!recbuf);
+
+
+ if (lp->intx)
+ {
+ outb( (oldaddr >> 8), _ADDR_HI);
+ outb( oldaddr & 0xff, _ADDR_LO);
+ }
+
+ didsomething++;
+ }
+
+ /* it can only be an xmit-done irq if we're xmitting :) */
+ /*if (status&TXFREEflag && !lp->in_txhandler && lp->sending)*/
+ if (status & lp->intmask & TXFREEflag)
+ {
+ struct Outgoing *out=&(lp->outgoing);
+ int was_sending=lp->sending;
+
+ lp->intmask &= ~TXFREEflag;
+
+ lp->in_txhandler++;
+ if (was_sending) lp->sending--;
+
+ BUGMSG(D_DURING,"TX IRQ (stat=%Xh, numsegs=%d, segnum=%d, skb=%ph)\n",
+ status,out->numsegs,out->segnum,out->skb);
+
+ if (was_sending && !(status&TXACKflag))
+ {
+ if (lp->lasttrans_dest != 0)
+ {
+ BUGMSG(D_EXTRA,"transmit was not acknowledged! (status=%Xh, dest=%02Xh)\n",
+ status,lp->lasttrans_dest);
+ lp->stats.tx_errors++;
+ lp->stats.tx_carrier_errors++;
+ }
+ else
+ {
+ BUGMSG(D_DURING,"broadcast was not acknowledged; that's normal (status=%Xh, dest=%02Xh)\n",
+ status,
+ lp->lasttrans_dest);
+ }
+ }
+
+ /* send packet if there is one */
+ arcnet_go_tx(dev,0);
+ didsomething++;
+
+ if (lp->intx)
+ {
+ BUGMSG(D_DURING,"TXDONE while intx! (status=%Xh, intx=%d)\n",
+ ARCSTATUS,lp->intx);
+ lp->in_txhandler--;
+ continue;
+ }
+
+ if (!lp->outgoing.skb)
+ {
+ BUGMSG(D_DURING,"TX IRQ done: no split to continue.\n");
+
+ /* inform upper layers */
+ if (!lp->txready) arcnet_tx_done(dev, lp);
+ lp->in_txhandler--;
+ continue;
+ }
+
+ /* if more than one segment, and not all segments
+ * are done, then continue xmit.
+ */
+ if (out->segnum<out->numsegs)
+ arcnetA_continue_tx(dev);
+ arcnet_go_tx(dev,0);
+
+ /* if segnum==numsegs, the transmission is finished;
+ * free the skb.
+ */
+ if (out->segnum>=out->numsegs)
+ {
+ /* transmit completed */
+ out->segnum++;
+ if (out->skb)
+ {
+ lp->stats.tx_bytes += out->skb->len;
+ dev_kfree_skb(out->skb,FREE_WRITE);
+ }
+ out->skb=NULL;
+
+ /* inform upper layers */
+ if (!lp->txready) arcnet_tx_done(dev, lp);
+ }
+ didsomething++;
+
+ lp->in_txhandler--;
+ }
+ else if (lp->txready && !lp->sending && !lp->intx)
+ {
+ BUGMSG(D_NORMAL,"recovery from silent TX (status=%Xh)\n",
+ status);
+ arcnet_go_tx(dev,0);
+ didsomething++;
+ }
+
+
+#ifdef DETECT_RECONFIGS
+ if (status & (lp->intmask) & RECONflag)
+ {
+ ACOMMAND(CFLAGScmd|CONFIGclear);
+ lp->stats.tx_carrier_errors++;
+
+#ifdef SHOW_RECONFIGS
+
+ BUGMSG(D_NORMAL,"Network reconfiguration detected"
+ " (status=%Xh, config=%X)\n",
+ status,lp->config);
+#endif /* SHOW_RECONFIGS */
+
+#ifdef RECON_THRESHOLD
+ /* is the RECON info empty or old? */
+ if (!lp->first_recon || !lp->last_recon ||
+ jiffies-lp->last_recon > HZ*10)
+ {
+ if (lp->network_down)
+ BUGMSG(D_NORMAL,"reconfiguration detected: cabling restored?\n");
+ lp->first_recon=lp->last_recon=jiffies;
+ lp->num_recons=lp->network_down=0;
+
+ BUGMSG(D_DURING,"recon: clearing counters.\n");
+ }
+ else /* add to current RECON counter */
+ {
+ lp->last_recon=jiffies;
+ lp->num_recons++;
+
+ BUGMSG(D_DURING,"recon: counter=%d, time=%lds, net=%d\n",
+ lp->num_recons,
+ (lp->last_recon-lp->first_recon)/HZ,
+ lp->network_down);
+
+ /* if network is marked up;
+ * and first_recon and last_recon are 60+ sec
+ * apart;
+ * and the average no. of recons counted is
+ * > RECON_THRESHOLD/min;
+ * then print a warning message.
+ */
+ if (!lp->network_down
+ && (lp->last_recon-lp->first_recon)<=HZ*60
+ && lp->num_recons >= RECON_THRESHOLD)
+ {
+ lp->network_down=1;
+ BUGMSG(D_NORMAL,"many reconfigurations detected: cabling problem?\n");
+ }
+ else if (!lp->network_down
+ && lp->last_recon-lp->first_recon > HZ*60)
+ {
+ /* reset counters if we've gone for
+ * over a minute.
+ */
+ lp->first_recon=lp->last_recon;
+ lp->num_recons=1;
+ }
+ }
+ }
+ else if (lp->network_down && jiffies-lp->last_recon > HZ*10)
+ {
+ if (lp->network_down)
+ BUGMSG(D_NORMAL,"cabling restored?\n");
+ lp->first_recon=lp->last_recon=0;
+ lp->num_recons=lp->network_down=0;
+
+ BUGMSG(D_DURING,"not recon: clearing counters anyway.\n");
+#endif
+ }
+#endif /* DETECT_RECONFIGS */
+ } while (--boguscount && didsomething);
+
+ BUGMSG(D_DURING,"net_interrupt complete (status=%Xh, count=%d)\n",
+ ARCSTATUS,boguscount);
+ BUGMSG(D_DURING,"\n");
+
+ SETMASK; /* put back interrupt mask */
+
+}
+
+
+
+/* A packet has arrived; grab it from the buffers and pass it to the generic
+ * arcnet_rx routing to deal with it.
+ */
+
+static void
+arc90io_rx(struct device *dev,int recbuf)
+{
+ struct arcnet_local *lp = (struct arcnet_local *)dev->priv;
+ int ioaddr=dev->base_addr;
+ union ArcPacket packetbuf;
+ union ArcPacket *arcpacket=&packetbuf;
+ u_char *arcsoft;
+ short length,offset;
+ u_char daddr,saddr;
+
+ lp->stats.rx_packets++;
+
+ get_whole_buffer(dev,recbuf*512,4,(char *)arcpacket);
+
+ saddr=arcpacket->hardheader.source;
+
+ /* if source is 0, it's a "used" packet! */
+ if (saddr==0)
+ {
+ BUGMSG(D_NORMAL,"discarding old packet. (status=%Xh)\n",
+ ARCSTATUS);
+ lp->stats.rx_errors++;
+ return;
+ }
+ /* Set source address to zero to mark it as old */
+
+ put_buffer_byte(dev,recbuf*512,0);
+
+ arcpacket->hardheader.source=0;
+
+ daddr=arcpacket->hardheader.destination;
+
+ if (arcpacket->hardheader.offset1) /* Normal Packet */
+ {
+ offset=arcpacket->hardheader.offset1;
+ arcsoft=&arcpacket->raw[offset];
+ length=256-offset;
+ }
+ else /* ExtendedPacket or ExceptionPacket */
+ {
+ offset=arcpacket->hardheader.offset2;
+ arcsoft=&arcpacket->raw[offset];
+ length=512-offset;
+ }
+
+ get_whole_buffer(dev,recbuf*512+offset,length,(char *)arcpacket+offset);
+
+ arcnet_rx(lp, arcsoft, length, saddr, daddr);
+
+ BUGLVL(D_RX) arcnet_dump_packet(lp->adev,arcpacket->raw,length>240,"rx");
+}
+
+
+
+/* Given an skb, copy a packet into the ARCnet buffers for later transmission
+ * by arcnet_go_tx.
+ */
+static void
+arc90io_prepare_tx(struct device *dev,u_char *hdr,int hdrlen,
+ char *data,int length,int daddr,int exceptA, int offset)
+{
+ struct arcnet_local *lp = (struct arcnet_local *)dev->priv;
+
+ lp->txbuf=lp->txbuf^1; /* XOR with 1 to alternate between 2 and 3 */
+
+ length+=hdrlen;
+
+ BUGMSG(D_TX,"arcnetAS_prep_tx: hdr:%ph, length:%d, data:%ph\n",
+ hdr,length,data);
+
+ put_buffer_byte(dev, lp->txbuf*512+1, daddr);
+
+ /* load packet into shared memory */
+ if (length<=MTU) /* Normal (256-byte) Packet */
+ put_buffer_byte(dev, lp->txbuf*512+2, offset=offset?offset:256-length);
+
+ else if (length>=MinTU || offset) /* Extended (512-byte) Packet */
+ {
+ put_buffer_byte(dev, lp->txbuf*512+2, 0);
+ put_buffer_byte(dev, lp->txbuf*512+3, offset=offset?offset:512-length);
+ }
+ else if (exceptA) /* RFC1201 Exception Packet */
+ {
+ put_buffer_byte(dev, lp->txbuf*512+2, 0);
+ put_buffer_byte(dev, lp->txbuf*512+3, offset=512-length-4);
+
+ /* exception-specific stuff - these four bytes
+ * make the packet long enough to fit in a 512-byte
+ * frame.
+ */
+
+ put_whole_buffer(dev, lp->txbuf*512+offset,4,"\0\0xff\0xff\0xff");
+ offset+=4;
+ }
+ else /* "other" Exception packet */
+ {
+ /* RFC1051 - set 4 trailing bytes to 0 */
+
+ put_whole_buffer(dev,lp->txbuf*512+508,4,"\0\0\0\0");
+
+ /* now round up to MinTU */
+ put_buffer_byte(dev, lp->txbuf*512+2, 0);
+ put_buffer_byte(dev, lp->txbuf*512+3, offset=512-MinTU);
+ }
+
+ /* copy the packet into ARCnet shmem
+ * - the first bytes of ClientData header are skipped
+ */
+
+ put_whole_buffer(dev, 512*lp->txbuf+offset, hdrlen,(u_char *)hdr);
+ put_whole_buffer(dev, 512*lp->txbuf+offset+hdrlen,length-hdrlen,data);
+
+ BUGMSG(D_DURING,"transmitting packet to station %02Xh (%d bytes)\n",
+ daddr,length);
+
+ lp->lastload_dest=daddr;
+ lp->txready=lp->txbuf; /* packet is ready for sending */
+}
+
+
+/****************************************************************************
+ * *
+ * Kernel Loadable Module Support *
+ * *
+ ****************************************************************************/
+
+
+#ifdef MODULE
+
+static struct device *cards[16]={NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,
+ NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL};
+
+
+int init_module(void)
+{
+ struct device *dev=cards[0];
+
+ cards[0]=dev=(struct device *)kmalloc(sizeof(struct device), GFP_KERNEL);
+ if (!dev)
+ return -ENOMEM;
+
+ memset(dev, 0, sizeof(struct device));
+
+ dev->name=(char *)kmalloc(9, GFP_KERNEL);
+ if (!dev->name)
+ {
+ kfree(dev);
+ return -ENOMEM;
+ }
+ dev->init=arc90io_probe;
+
+ if (device)
+ strcpy(dev->name,device);
+ else arcnet_makename(dev->name);
+
+ dev->base_addr=io;
+ dev->irq=irq;
+
+ if (dev->irq==2) dev->irq=9;
+
+ if (register_netdev(dev) != 0)
+ return -EIO;
+
+ /* Increase use count of arcnet.o */
+ arcnet_use_count(1);
+ return 0;
+}
+
+void cleanup_module(void)
+{
+ struct device *dev=cards[0];
+ int ioaddr=dev->base_addr;
+
+ if (dev->start) (*dev->stop)(dev);
+
+ /* Flush TX and disable RX */
+ if (ioaddr)
+ {
+ AINTMASK(0); /* disable IRQ's */
+ ACOMMAND(NOTXcmd); /* stop transmit */
+ ACOMMAND(NORXcmd); /* disable receive */
+
+ /* Set the thing back to MMAP mode, in case the old
+ driver is loaded later */
+ outb( (inb(_CONFIG)&~IOMAPflag),_CONFIG);
+ }
+
+ if (dev->irq)
+ {
+ irq2dev_map[dev->irq] = NULL;
+ free_irq(dev->irq,NULL);
+ }
+
+ if (dev->base_addr) release_region(dev->base_addr,ARCNET_TOTAL_SIZE);
+ unregister_netdev(dev);
+ kfree(dev->priv);
+ dev->priv = NULL;
+
+ /* Decrease use count of arcnet.o */
+ arcnet_use_count(0);
+}
+#else
+
+
+__initfunc(void com90io_setup (char *str, int *ints))
+{
+ struct device *dev;
+
+ if (arcnet_num_devs == MAX_ARCNET_DEVS)
+ {
+ printk("com90xx IO-MAP: Too many ARCnet devices registered (max %d).\n",
+ MAX_ARCNET_DEVS);
+ return;
+ }
+
+ dev=&arcnet_devs[arcnet_num_devs];
+
+ if (ints[0] < 1)
+ {
+ printk("com90xx IO-MAP: You must give an IO address.\n");
+ return;
+ }
+
+ dev->init=arc90io_probe;
+
+ switch(ints[0])
+ {
+ case 3: /* ERROR */
+ printk("com90xx IO-MAP: Too many arguments.\n");
+
+ case 2: /* IRQ */
+ dev->irq=ints[2];
+
+ case 1: /* IO address */
+ dev->base_addr=ints[1];
+ }
+
+ dev->name = (char *)&arcnet_dev_names[arcnet_num_devs];
+
+ if (str)
+ strncpy(dev->name, str, 9);
+
+ arcnet_num_devs++;
+}
+
+#endif /* MODULE */
+
+
+
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TCL-scripts by Sam Shen, slshen@lbl.gov