--- /dev/null
+/*** ltpc.c -- a driver for the LocalTalk PC card.
+ *
+ * Copyright (c) 1995,1996 Bradford W. Johnson <johns393@maroon.tc.umn.edu>
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ *
+ * This is ALPHA code at best. It may not work for you. It may
+ * damage your equipment. It may damage your relations with other
+ * users of your network. Use it at your own risk!
+ *
+ * Based in part on:
+ * skeleton.c by Donald Becker
+ * dummy.c by Nick Holloway and Alan Cox
+ * loopback.c by Ross Biro, Fred van Kampen, Donald Becker
+ * the netatalk source code (UMICH)
+ * lots of work on the card...
+ *
+ * I do not have access to the (proprietary) SDK that goes with the card.
+ * If you do, I don't want to know about it, and you can probably write
+ * a better driver yourself anyway. This does mean that the pieces that
+ * talk to the card are guesswork on my part, so use at your own risk!
+ *
+ * This is my first try at writing Linux networking code, and is also
+ * guesswork. Again, use at your own risk! (Although on this part, I'd
+ * welcome suggestions)
+ *
+ * This is a loadable kernel module which seems to work at my site
+ * consisting of a 1.2.13 linux box running netatalk 1.3.3, and with
+ * the kernel support from 1.3.3b2 including patches routing.patch
+ * and ddp.disappears.from.chooser. In order to run it, you will need
+ * to patch ddp.c and aarp.c in the kernel, but only a little...
+ *
+ * I'm fairly confident that while this is arguably badly written, the
+ * problems that people experience will be "higher level", that is, with
+ * complications in the netatalk code. The driver itself doesn't do
+ * anything terribly complicated -- it pretends to be an ether device
+ * as far as netatalk is concerned, strips the DDP data out of the ether
+ * frame and builds a LLAP packet to send out the card. In the other
+ * direction, it receives LLAP frames from the card and builds a fake
+ * ether packet that it then tosses up to the networking code. You can
+ * argue (correctly) that this is an ugly way to do things, but it
+ * requires a minimal amount of fooling with the code in ddp.c and aarp.c.
+ *
+ * The card will do a lot more than is used here -- I *think* it has the
+ * layers up through ATP. Even if you knew how that part works (which I
+ * don't) it would be a big job to carve up the kernel ddp code to insert
+ * things at a higher level, and probably a bad idea...
+ *
+ * There are a number of other cards that do LocalTalk on the PC. If
+ * nobody finds any insurmountable (at the netatalk level) problems
+ * here, this driver should encourage people to put some work into the
+ * other cards (some of which I gather are still commercially available)
+ * and also to put hooks for LocalTalk into the official ddp code.
+ *
+ * I welcome comments and suggestions. This is my first try at Linux
+ * networking stuff, and there are probably lots of things that I did
+ * suboptimally.
+ *
+ ***/
+
+/***
+ *
+ * $Log: ltpc.c,v $
+ * Revision 1.1.2.1 2000/03/01 05:35:07 jgarzik
+ * at and tr cleanup
+ *
+ * Revision 1.8 1997/01/28 05:44:54 bradford
+ * Clean up for non-module a little.
+ * Hacked about a bit to clean things up - Alan Cox
+ * Probably broken it from the origina 1.8
+ *
+
+ * 1998/11/09: David Huggins-Daines <dhd@debian.org>
+ * Cleaned up the initialization code to use the standard autoirq methods,
+ and to probe for things in the standard order of i/o, irq, dma. This
+ removes the "reset the reset" hack, because I couldn't figure out an
+ easy way to get the card to trigger an interrupt after it.
+ * Added support for passing configuration parameters on the kernel command
+ line and through insmod
+ * Changed the device name from "ltalk0" to "lt0", both to conform with the
+ other localtalk driver, and to clear up the inconsistency between the
+ module and the non-module versions of the driver :-)
+ * Added a bunch of comments (I was going to make some enums for the state
+ codes and the register offsets, but I'm still not sure exactly what their
+ semantics are)
+ * Don't poll anymore in interrupt-driven mode
+ * It seems to work as a module now (as of 2.1.127), but I don't think
+ I'm responsible for that...
+
+ *
+ * Revision 1.7 1996/12/12 03:42:33 bradford
+ * DMA alloc cribbed from 3c505.c.
+ *
+ * Revision 1.6 1996/12/12 03:18:58 bradford
+ * Added virt_to_bus; works in 2.1.13.
+ *
+ * Revision 1.5 1996/12/12 03:13:22 root
+ * xmitQel initialization -- think through better though.
+ *
+ * Revision 1.4 1996/06/18 14:55:55 root
+ * Change names to ltpc. Tabs. Took a shot at dma alloc,
+ * although more needs to be done eventually.
+ *
+ * Revision 1.3 1996/05/22 14:59:39 root
+ * Change dev->open, dev->close to track dummy.c in 1.99.(around 7)
+ *
+ * Revision 1.2 1996/05/22 14:58:24 root
+ * Change tabs mostly.
+ *
+ * Revision 1.1 1996/04/23 04:45:09 root
+ * Initial revision
+ *
+ * Revision 0.16 1996/03/05 15:59:56 root
+ * Change ARPHRD_LOCALTLK definition to the "real" one.
+ *
+ * Revision 0.15 1996/03/05 06:28:30 root
+ * Changes for kernel 1.3.70. Still need a few patches to kernel, but
+ * it's getting closer.
+ *
+ * Revision 0.14 1996/02/25 17:38:32 root
+ * More cleanups. Removed query to card on get_stats.
+ *
+ * Revision 0.13 1996/02/21 16:27:40 root
+ * Refix debug_print_skb. Fix mac.raw gotcha that appeared in 1.3.65.
+ * Clean up receive code a little.
+ *
+ * Revision 0.12 1996/02/19 16:34:53 root
+ * Fix debug_print_skb. Kludge outgoing snet to 0 when using startup
+ * range. Change debug to mask: 1 for verbose, 2 for higher level stuff
+ * including packet printing, 4 for lower level (card i/o) stuff.
+ *
+ * Revision 0.11 1996/02/12 15:53:38 root
+ * Added router sends (requires new aarp.c patch)
+ *
+ * Revision 0.10 1996/02/11 00:19:35 root
+ * Change source LTALK_LOGGING debug switch to insmod ... debug=2.
+ *
+ * Revision 0.9 1996/02/10 23:59:35 root
+ * Fixed those fixes for 1.2 -- DANGER! The at.h that comes with netatalk
+ * has a *different* definition of struct sockaddr_at than the Linux kernel
+ * does. This is an "insidious and invidious" bug...
+ * (Actually the preceding comment is false -- it's the atalk.h in the
+ * ancient atalk-0.06 that's the problem)
+ *
+ * Revision 0.8 1996/02/10 19:09:00 root
+ * Merge 1.3 changes. Tested OK under 1.3.60.
+ *
+ * Revision 0.7 1996/02/10 17:56:56 root
+ * Added debug=1 parameter on insmod for debugging prints. Tried
+ * to fix timer unload on rmmod, but I don't think that's the problem.
+ *
+ * Revision 0.6 1995/12/31 19:01:09 root
+ * Clean up rmmod, irq comments per feedback from Corin Anderson (Thanks Corey!)
+ * Clean up initial probing -- sometimes the card wakes up latched in reset.
+ *
+ * Revision 0.5 1995/12/22 06:03:44 root
+ * Added comments in front and cleaned up a bit.
+ * This version sent out to people.
+ *
+ * Revision 0.4 1995/12/18 03:46:44 root
+ * Return shortDDP to longDDP fake to 0/0. Added command structs.
+ *
+ ***/
+
+/* ltpc jumpers are:
+*
+* Interrupts -- set at most one. If none are set, the driver uses
+* polled mode. Because the card was developed in the XT era, the
+* original documentation refers to IRQ2. Since you'll be running
+* this on an AT (or later) class machine, that really means IRQ9.
+*
+* SW1 IRQ 4
+* SW2 IRQ 3
+* SW3 IRQ 9 (2 in original card documentation only applies to XT)
+*
+*
+* DMA -- choose DMA 1 or 3, and set both corresponding switches.
+*
+* SW4 DMA 3
+* SW5 DMA 1
+* SW6 DMA 3
+* SW7 DMA 1
+*
+*
+* I/O address -- choose one.
+*
+* SW8 220 / 240
+*/
+
+/* To have some stuff logged, do
+* insmod ltpc.o debug=1
+*
+* For a whole bunch of stuff, use higher numbers.
+*
+* The default is 0, i.e. no messages except for the probe results.
+*/
+
+/* insmod-tweakable variables */
+static int debug;
+#define DEBUG_VERBOSE 1
+#define DEBUG_UPPER 2
+#define DEBUG_LOWER 4
+
+static int io;
+static int irq;
+static int dma;
+
+#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/spinlock.h>
+#include <linux/in.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>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/atalk.h>
+#include <linux/bitops.h>
+#include <linux/gfp.h>
+
+#include <asm/dma.h>
+#include <asm/io.h>
+
+/* our stuff */
+#include "ltpc.h"
+
+static DEFINE_SPINLOCK(txqueue_lock);
+static DEFINE_SPINLOCK(mbox_lock);
+
+/* function prototypes */
+static int do_read(struct net_device *dev, void *cbuf, int cbuflen,
+ void *dbuf, int dbuflen);
+static int sendup_buffer (struct net_device *dev);
+
+/* Dma Memory related stuff, cribbed directly from 3c505.c */
+
+static unsigned long dma_mem_alloc(int size)
+{
+ int order = get_order(size);
+
+ return __get_dma_pages(GFP_KERNEL, order);
+}
+
+/* DMA data buffer, DMA command buffer */
+static unsigned char *ltdmabuf;
+static unsigned char *ltdmacbuf;
+
+/* private struct, holds our appletalk address */
+
+struct ltpc_private
+{
+ struct atalk_addr my_addr;
+};
+
+/* transmit queue element struct */
+
+struct xmitQel {
+ struct xmitQel *next;
+ /* command buffer */
+ unsigned char *cbuf;
+ short cbuflen;
+ /* data buffer */
+ unsigned char *dbuf;
+ short dbuflen;
+ unsigned char QWrite; /* read or write data */
+ unsigned char mailbox;
+};
+
+/* the transmit queue itself */
+
+static struct xmitQel *xmQhd, *xmQtl;
+
+static void enQ(struct xmitQel *qel)
+{
+ unsigned long flags;
+ qel->next = NULL;
+
+ spin_lock_irqsave(&txqueue_lock, flags);
+ if (xmQtl) {
+ xmQtl->next = qel;
+ } else {
+ xmQhd = qel;
+ }
+ xmQtl = qel;
+ spin_unlock_irqrestore(&txqueue_lock, flags);
+
+ if (debug & DEBUG_LOWER)
+ printk("enqueued a 0x%02x command\n",qel->cbuf[0]);
+}
+
+static struct xmitQel *deQ(void)
+{
+ unsigned long flags;
+ int i;
+ struct xmitQel *qel=NULL;
+
+ spin_lock_irqsave(&txqueue_lock, flags);
+ if (xmQhd) {
+ qel = xmQhd;
+ xmQhd = qel->next;
+ if(!xmQhd) xmQtl = NULL;
+ }
+ spin_unlock_irqrestore(&txqueue_lock, flags);
+
+ if ((debug & DEBUG_LOWER) && qel) {
+ int n;
+ printk(KERN_DEBUG "ltpc: dequeued command ");
+ n = qel->cbuflen;
+ if (n>100) n=100;
+ for(i=0;i<n;i++) printk("%02x ",qel->cbuf[i]);
+ printk("\n");
+ }
+
+ return qel;
+}
+
+/* and... the queue elements we'll be using */
+static struct xmitQel qels[16];
+
+/* and their corresponding mailboxes */
+static unsigned char mailbox[16];
+static unsigned char mboxinuse[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
+
+static int wait_timeout(struct net_device *dev, int c)
+{
+ /* returns true if it stayed c */
+ /* this uses base+6, but it's ok */
+ int i;
+
+ /* twenty second or so total */
+
+ for(i=0;i<200000;i++) {
+ if ( c != inb_p(dev->base_addr+6) ) return 0;
+ udelay(100);
+ }
+ return 1; /* timed out */
+}
+
+/* get the first free mailbox */
+
+static int getmbox(void)
+{
+ unsigned long flags;
+ int i;
+
+ spin_lock_irqsave(&mbox_lock, flags);
+ for(i=1;i<16;i++) if(!mboxinuse[i]) {
+ mboxinuse[i]=1;
+ spin_unlock_irqrestore(&mbox_lock, flags);
+ return i;
+ }
+ spin_unlock_irqrestore(&mbox_lock, flags);
+ return 0;
+}
+
+/* read a command from the card */
+static void handlefc(struct net_device *dev)
+{
+ /* called *only* from idle, non-reentrant */
+ int dma = dev->dma;
+ int base = dev->base_addr;
+ unsigned long flags;
+
+
+ flags=claim_dma_lock();
+ disable_dma(dma);
+ clear_dma_ff(dma);
+ set_dma_mode(dma,DMA_MODE_READ);
+ set_dma_addr(dma,virt_to_bus(ltdmacbuf));
+ set_dma_count(dma,50);
+ enable_dma(dma);
+ release_dma_lock(flags);
+
+ inb_p(base+3);
+ inb_p(base+2);
+
+ if ( wait_timeout(dev,0xfc) ) printk("timed out in handlefc\n");
+}
+
+/* read data from the card */
+static void handlefd(struct net_device *dev)
+{
+ int dma = dev->dma;
+ int base = dev->base_addr;
+ unsigned long flags;
+
+ flags=claim_dma_lock();
+ disable_dma(dma);
+ clear_dma_ff(dma);
+ set_dma_mode(dma,DMA_MODE_READ);
+ set_dma_addr(dma,virt_to_bus(ltdmabuf));
+ set_dma_count(dma,800);
+ enable_dma(dma);
+ release_dma_lock(flags);
+
+ inb_p(base+3);
+ inb_p(base+2);
+
+ if ( wait_timeout(dev,0xfd) ) printk("timed out in handlefd\n");
+ sendup_buffer(dev);
+}
+
+static void handlewrite(struct net_device *dev)
+{
+ /* called *only* from idle, non-reentrant */
+ /* on entry, 0xfb and ltdmabuf holds data */
+ int dma = dev->dma;
+ int base = dev->base_addr;
+ unsigned long flags;
+
+ flags=claim_dma_lock();
+ disable_dma(dma);
+ clear_dma_ff(dma);
+ set_dma_mode(dma,DMA_MODE_WRITE);
+ set_dma_addr(dma,virt_to_bus(ltdmabuf));
+ set_dma_count(dma,800);
+ enable_dma(dma);
+ release_dma_lock(flags);
+
+ inb_p(base+3);
+ inb_p(base+2);
+
+ if ( wait_timeout(dev,0xfb) ) {
+ flags=claim_dma_lock();
+ printk("timed out in handlewrite, dma res %d\n",
+ get_dma_residue(dev->dma) );
+ release_dma_lock(flags);
+ }
+}
+
+static void handleread(struct net_device *dev)
+{
+ /* on entry, 0xfb */
+ /* on exit, ltdmabuf holds data */
+ int dma = dev->dma;
+ int base = dev->base_addr;
+ unsigned long flags;
+
+
+ flags=claim_dma_lock();
+ disable_dma(dma);
+ clear_dma_ff(dma);
+ set_dma_mode(dma,DMA_MODE_READ);
+ set_dma_addr(dma,virt_to_bus(ltdmabuf));
+ set_dma_count(dma,800);
+ enable_dma(dma);
+ release_dma_lock(flags);
+
+ inb_p(base+3);
+ inb_p(base+2);
+ if ( wait_timeout(dev,0xfb) ) printk("timed out in handleread\n");
+}
+
+static void handlecommand(struct net_device *dev)
+{
+ /* on entry, 0xfa and ltdmacbuf holds command */
+ int dma = dev->dma;
+ int base = dev->base_addr;
+ unsigned long flags;
+
+ flags=claim_dma_lock();
+ disable_dma(dma);
+ clear_dma_ff(dma);
+ set_dma_mode(dma,DMA_MODE_WRITE);
+ set_dma_addr(dma,virt_to_bus(ltdmacbuf));
+ set_dma_count(dma,50);
+ enable_dma(dma);
+ release_dma_lock(flags);
+ inb_p(base+3);
+ inb_p(base+2);
+ if ( wait_timeout(dev,0xfa) ) printk("timed out in handlecommand\n");
+}
+
+/* ready made command for getting the result from the card */
+static unsigned char rescbuf[2] = {LT_GETRESULT,0};
+static unsigned char resdbuf[2];
+
+static int QInIdle;
+
+/* idle expects to be called with the IRQ line high -- either because of
+ * an interrupt, or because the line is tri-stated
+ */
+
+static void idle(struct net_device *dev)
+{
+ unsigned long flags;
+ int state;
+ /* FIXME This is initialized to shut the warning up, but I need to
+ * think this through again.
+ */
+ struct xmitQel *q = NULL;
+ int oops;
+ int i;
+ int base = dev->base_addr;
+
+ spin_lock_irqsave(&txqueue_lock, flags);
+ if(QInIdle) {
+ spin_unlock_irqrestore(&txqueue_lock, flags);
+ return;
+ }
+ QInIdle = 1;
+ spin_unlock_irqrestore(&txqueue_lock, flags);
+
+ /* this tri-states the IRQ line */
+ (void) inb_p(base+6);
+
+ oops = 100;
+
+loop:
+ if (0>oops--) {
+ printk("idle: looped too many times\n");
+ goto done;
+ }
+
+ state = inb_p(base+6);
+ if (state != inb_p(base+6)) goto loop;
+
+ switch(state) {
+ case 0xfc:
+ /* incoming command */
+ if (debug & DEBUG_LOWER) printk("idle: fc\n");
+ handlefc(dev);
+ break;
+ case 0xfd:
+ /* incoming data */
+ if(debug & DEBUG_LOWER) printk("idle: fd\n");
+ handlefd(dev);
+ break;
+ case 0xf9:
+ /* result ready */
+ if (debug & DEBUG_LOWER) printk("idle: f9\n");
+ if(!mboxinuse[0]) {
+ mboxinuse[0] = 1;
+ qels[0].cbuf = rescbuf;
+ qels[0].cbuflen = 2;
+ qels[0].dbuf = resdbuf;
+ qels[0].dbuflen = 2;
+ qels[0].QWrite = 0;
+ qels[0].mailbox = 0;
+ enQ(&qels[0]);
+ }
+ inb_p(dev->base_addr+1);
+ inb_p(dev->base_addr+0);
+ if( wait_timeout(dev,0xf9) )
+ printk("timed out idle f9\n");
+ break;
+ case 0xf8:
+ /* ?? */
+ if (xmQhd) {
+ inb_p(dev->base_addr+1);
+ inb_p(dev->base_addr+0);
+ if(wait_timeout(dev,0xf8) )
+ printk("timed out idle f8\n");
+ } else {
+ goto done;
+ }
+ break;
+ case 0xfa:
+ /* waiting for command */
+ if(debug & DEBUG_LOWER) printk("idle: fa\n");
+ if (xmQhd) {
+ q=deQ();
+ memcpy(ltdmacbuf,q->cbuf,q->cbuflen);
+ ltdmacbuf[1] = q->mailbox;
+ if (debug>1) {
+ int n;
+ printk("ltpc: sent command ");
+ n = q->cbuflen;
+ if (n>100) n=100;
+ for(i=0;i<n;i++)
+ printk("%02x ",ltdmacbuf[i]);
+ printk("\n");
+ }
+ handlecommand(dev);
+ if(0xfa==inb_p(base+6)) {
+ /* we timed out, so return */
+ goto done;
+ }
+ } else {
+ /* we don't seem to have a command */
+ if (!mboxinuse[0]) {
+ mboxinuse[0] = 1;
+ qels[0].cbuf = rescbuf;
+ qels[0].cbuflen = 2;
+ qels[0].dbuf = resdbuf;
+ qels[0].dbuflen = 2;
+ qels[0].QWrite = 0;
+ qels[0].mailbox = 0;
+ enQ(&qels[0]);
+ } else {
+ printk("trouble: response command already queued\n");
+ goto done;
+ }
+ }
+ break;
+ case 0Xfb:
+ /* data transfer ready */
+ if(debug & DEBUG_LOWER) printk("idle: fb\n");
+ if(q->QWrite) {
+ memcpy(ltdmabuf,q->dbuf,q->dbuflen);
+ handlewrite(dev);
+ } else {
+ handleread(dev);
+ /* non-zero mailbox numbers are for
+ commmands, 0 is for GETRESULT
+ requests */
+ if(q->mailbox) {
+ memcpy(q->dbuf,ltdmabuf,q->dbuflen);
+ } else {
+ /* this was a result */
+ mailbox[ 0x0f & ltdmabuf[0] ] = ltdmabuf[1];
+ mboxinuse[0]=0;
+ }
+ }
+ break;
+ }
+ goto loop;
+
+done:
+ QInIdle=0;
+
+ /* now set the interrupts back as appropriate */
+ /* the first read takes it out of tri-state (but still high) */
+ /* the second resets it */
+ /* note that after this point, any read of base+6 will
+ trigger an interrupt */
+
+ if (dev->irq) {
+ inb_p(base+7);
+ inb_p(base+7);
+ }
+}
+
+
+static int do_write(struct net_device *dev, void *cbuf, int cbuflen,
+ void *dbuf, int dbuflen)
+{
+
+ int i = getmbox();
+ int ret;
+
+ if(i) {
+ qels[i].cbuf = cbuf;
+ qels[i].cbuflen = cbuflen;
+ qels[i].dbuf = dbuf;
+ qels[i].dbuflen = dbuflen;
+ qels[i].QWrite = 1;
+ qels[i].mailbox = i; /* this should be initted rather */
+ enQ(&qels[i]);
+ idle(dev);
+ ret = mailbox[i];
+ mboxinuse[i]=0;
+ return ret;
+ }
+ printk("ltpc: could not allocate mbox\n");
+ return -1;
+}
+
+static int do_read(struct net_device *dev, void *cbuf, int cbuflen,
+ void *dbuf, int dbuflen)
+{
+
+ int i = getmbox();
+ int ret;
+
+ if(i) {
+ qels[i].cbuf = cbuf;
+ qels[i].cbuflen = cbuflen;
+ qels[i].dbuf = dbuf;
+ qels[i].dbuflen = dbuflen;
+ qels[i].QWrite = 0;
+ qels[i].mailbox = i; /* this should be initted rather */
+ enQ(&qels[i]);
+ idle(dev);
+ ret = mailbox[i];
+ mboxinuse[i]=0;
+ return ret;
+ }
+ printk("ltpc: could not allocate mbox\n");
+ return -1;
+}
+
+/* end of idle handlers -- what should be seen is do_read, do_write */
+
+static struct timer_list ltpc_timer;
+
+static netdev_tx_t ltpc_xmit(struct sk_buff *skb, struct net_device *dev);
+
+static int read_30 ( struct net_device *dev)
+{
+ lt_command c;
+ c.getflags.command = LT_GETFLAGS;
+ return do_read(dev, &c, sizeof(c.getflags),&c,0);
+}
+
+static int set_30 (struct net_device *dev,int x)
+{
+ lt_command c;
+ c.setflags.command = LT_SETFLAGS;
+ c.setflags.flags = x;
+ return do_write(dev, &c, sizeof(c.setflags),&c,0);
+}
+
+/* LLAP to DDP translation */
+
+static int sendup_buffer (struct net_device *dev)
+{
+ /* on entry, command is in ltdmacbuf, data in ltdmabuf */
+ /* called from idle, non-reentrant */
+
+ int dnode, snode, llaptype, len;
+ int sklen;
+ struct sk_buff *skb;
+ struct lt_rcvlap *ltc = (struct lt_rcvlap *) ltdmacbuf;
+
+ if (ltc->command != LT_RCVLAP) {
+ printk("unknown command 0x%02x from ltpc card\n",ltc->command);
+ return -1;
+ }
+ dnode = ltc->dnode;
+ snode = ltc->snode;
+ llaptype = ltc->laptype;
+ len = ltc->length;
+
+ sklen = len;
+ if (llaptype == 1)
+ sklen += 8; /* correct for short ddp */
+ if(sklen > 800) {
+ printk(KERN_INFO "%s: nonsense length in ltpc command 0x14: 0x%08x\n",
+ dev->name,sklen);
+ return -1;
+ }
+
+ if ( (llaptype==0) || (llaptype>2) ) {
+ printk(KERN_INFO "%s: unknown LLAP type: %d\n",dev->name,llaptype);
+ return -1;
+ }
+
+
+ skb = dev_alloc_skb(3+sklen);
+ if (skb == NULL)
+ {
+ printk("%s: dropping packet due to memory squeeze.\n",
+ dev->name);
+ return -1;
+ }
+ skb->dev = dev;
+
+ if (sklen > len)
+ skb_reserve(skb,8);
+ skb_put(skb,len+3);
+ skb->protocol = htons(ETH_P_LOCALTALK);
+ /* add LLAP header */
+ skb->data[0] = dnode;
+ skb->data[1] = snode;
+ skb->data[2] = llaptype;
+ skb_reset_mac_header(skb); /* save pointer to llap header */
+ skb_pull(skb,3);
+
+ /* copy ddp(s,e)hdr + contents */
+ skb_copy_to_linear_data(skb, ltdmabuf, len);
+
+ skb_reset_transport_header(skb);
+
+ dev->stats.rx_packets++;
+ dev->stats.rx_bytes += skb->len;
+
+ /* toss it onwards */
+ netif_rx(skb);
+ return 0;
+}
+
+/* the handler for the board interrupt */
+
+static irqreturn_t
+ltpc_interrupt(int irq, void *dev_id)
+{
+ struct net_device *dev = dev_id;
+
+ if (dev==NULL) {
+ printk("ltpc_interrupt: unknown device.\n");
+ return IRQ_NONE;
+ }
+
+ inb_p(dev->base_addr+6); /* disable further interrupts from board */
+
+ idle(dev); /* handle whatever is coming in */
+
+ /* idle re-enables interrupts from board */
+
+ return IRQ_HANDLED;
+}
+
+/***
+ *
+ * The ioctls that the driver responds to are:
+ *
+ * SIOCSIFADDR -- do probe using the passed node hint.
+ * SIOCGIFADDR -- return net, node.
+ *
+ * some of this stuff should be done elsewhere.
+ *
+ ***/
+
+static int ltpc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+ struct sockaddr_at *sa = (struct sockaddr_at *) &ifr->ifr_addr;
+ /* we'll keep the localtalk node address in dev->pa_addr */
+ struct ltpc_private *ltpc_priv = netdev_priv(dev);
+ struct atalk_addr *aa = <pc_priv->my_addr;
+ struct lt_init c;
+ int ltflags;
+
+ if(debug & DEBUG_VERBOSE) printk("ltpc_ioctl called\n");
+
+ switch(cmd) {
+ case SIOCSIFADDR:
+
+ aa->s_net = sa->sat_addr.s_net;
+
+ /* this does the probe and returns the node addr */
+ c.command = LT_INIT;
+ c.hint = sa->sat_addr.s_node;
+
+ aa->s_node = do_read(dev,&c,sizeof(c),&c,0);
+
+ /* get all llap frames raw */
+ ltflags = read_30(dev);
+ ltflags |= LT_FLAG_ALLLAP;
+ set_30 (dev,ltflags);
+
+ dev->broadcast[0] = 0xFF;
+ 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 -EINVAL;
+ }
+}
+
+static void set_multicast_list(struct net_device *dev)
+{
+ /* This needs to be present to keep netatalk happy. */
+ /* Actually netatalk needs fixing! */
+}
+
+static int ltpc_poll_counter;
+
+static void ltpc_poll(unsigned long l)
+{
+ struct net_device *dev = (struct net_device *) l;
+
+ del_timer(<pc_timer);
+
+ if(debug & DEBUG_VERBOSE) {
+ if (!ltpc_poll_counter) {
+ ltpc_poll_counter = 50;
+ printk("ltpc poll is alive\n");
+ }
+ ltpc_poll_counter--;
+ }
+
+ if (!dev)
+ return; /* we've been downed */
+
+ /* poll 20 times per second */
+ idle(dev);
+ ltpc_timer.expires = jiffies + HZ/20;
+
+ add_timer(<pc_timer);
+}
+
+/* DDP to LLAP translation */
+
+static netdev_tx_t ltpc_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ /* in kernel 1.3.xx, on entry skb->data points to ddp header,
+ * and skb->len is the length of the ddp data + ddp header
+ */
+ int i;
+ struct lt_sendlap cbuf;
+ unsigned char *hdr;
+
+ cbuf.command = LT_SENDLAP;
+ cbuf.dnode = skb->data[0];
+ cbuf.laptype = skb->data[2];
+ skb_pull(skb,3); /* skip past LLAP header */
+ cbuf.length = skb->len; /* this is host order */
+ skb_reset_transport_header(skb);
+
+ if(debug & DEBUG_UPPER) {
+ printk("command ");
+ for(i=0;i<6;i++)
+ printk("%02x ",((unsigned char *)&cbuf)[i]);
+ printk("\n");
+ }
+
+ hdr = skb_transport_header(skb);
+ do_write(dev, &cbuf, sizeof(cbuf), hdr, skb->len);
+
+ if(debug & DEBUG_UPPER) {
+ printk("sent %d ddp bytes\n",skb->len);
+ for (i = 0; i < skb->len; i++)
+ printk("%02x ", hdr[i]);
+ printk("\n");
+ }
+
+ dev->stats.tx_packets++;
+ dev->stats.tx_bytes += skb->len;
+
+ dev_kfree_skb(skb);
+ return NETDEV_TX_OK;
+}
+
+/* initialization stuff */
+
+static int __init ltpc_probe_dma(int base, int dma)
+{
+ int want = (dma == 3) ? 2 : (dma == 1) ? 1 : 3;
+ unsigned long timeout;
+ unsigned long f;
+
+ if (want & 1) {
+ if (request_dma(1,"ltpc")) {
+ want &= ~1;
+ } else {
+ f=claim_dma_lock();
+ disable_dma(1);
+ clear_dma_ff(1);
+ set_dma_mode(1,DMA_MODE_WRITE);
+ set_dma_addr(1,virt_to_bus(ltdmabuf));
+ set_dma_count(1,sizeof(struct lt_mem));
+ enable_dma(1);
+ release_dma_lock(f);
+ }
+ }
+ if (want & 2) {
+ if (request_dma(3,"ltpc")) {
+ want &= ~2;
+ } else {
+ f=claim_dma_lock();
+ disable_dma(3);
+ clear_dma_ff(3);
+ set_dma_mode(3,DMA_MODE_WRITE);
+ set_dma_addr(3,virt_to_bus(ltdmabuf));
+ set_dma_count(3,sizeof(struct lt_mem));
+ enable_dma(3);
+ release_dma_lock(f);
+ }
+ }
+ /* set up request */
+
+ /* FIXME -- do timings better! */
+
+ ltdmabuf[0] = LT_READMEM;
+ ltdmabuf[1] = 1; /* mailbox */
+ ltdmabuf[2] = 0; ltdmabuf[3] = 0; /* address */
+ ltdmabuf[4] = 0; ltdmabuf[5] = 1; /* read 0x0100 bytes */
+ ltdmabuf[6] = 0; /* dunno if this is necessary */
+
+ inb_p(io+1);
+ inb_p(io+0);
+ timeout = jiffies+100*HZ/100;
+ while(time_before(jiffies, timeout)) {
+ if ( 0xfa == inb_p(io+6) ) break;
+ }
+
+ inb_p(io+3);
+ inb_p(io+2);
+ while(time_before(jiffies, timeout)) {
+ if ( 0xfb == inb_p(io+6) ) break;
+ }
+
+ /* release the other dma channel (if we opened both of them) */
+
+ if ((want & 2) && (get_dma_residue(3)==sizeof(struct lt_mem))) {
+ want &= ~2;
+ free_dma(3);
+ }
+
+ if ((want & 1) && (get_dma_residue(1)==sizeof(struct lt_mem))) {
+ want &= ~1;
+ free_dma(1);
+ }
+
+ if (!want)
+ return 0;
+
+ return (want & 2) ? 3 : 1;
+}
+
+static const struct net_device_ops ltpc_netdev = {
+ .ndo_start_xmit = ltpc_xmit,
+ .ndo_do_ioctl = ltpc_ioctl,
+ .ndo_set_rx_mode = set_multicast_list,
+};
+
+struct net_device * __init ltpc_probe(void)
+{
+ struct net_device *dev;
+ int err = -ENOMEM;
+ int x=0,y=0;
+ int autoirq;
+ unsigned long f;
+ unsigned long timeout;
+
+ dev = alloc_ltalkdev(sizeof(struct ltpc_private));
+ if (!dev)
+ goto out;
+
+ /* probe for the I/O port address */
+
+ if (io != 0x240 && request_region(0x220,8,"ltpc")) {
+ x = inb_p(0x220+6);
+ if ( (x!=0xff) && (x>=0xf0) ) {
+ io = 0x220;
+ goto got_port;
+ }
+ release_region(0x220,8);
+ }
+ if (io != 0x220 && request_region(0x240,8,"ltpc")) {
+ y = inb_p(0x240+6);
+ if ( (y!=0xff) && (y>=0xf0) ){
+ io = 0x240;
+ goto got_port;
+ }
+ release_region(0x240,8);
+ }
+
+ /* give up in despair */
+ printk(KERN_ERR "LocalTalk card not found; 220 = %02x, 240 = %02x.\n", x,y);
+ err = -ENODEV;
+ goto out1;
+
+ got_port:
+ /* probe for the IRQ line */
+ if (irq < 2) {
+ unsigned long irq_mask;
+
+ irq_mask = probe_irq_on();
+ /* reset the interrupt line */
+ inb_p(io+7);
+ inb_p(io+7);
+ /* trigger an interrupt (I hope) */
+ inb_p(io+6);
+ mdelay(2);
+ autoirq = probe_irq_off(irq_mask);
+
+ if (autoirq == 0) {
+ printk(KERN_ERR "ltpc: probe at %#x failed to detect IRQ line.\n", io);
+ } else {
+ irq = autoirq;
+ }
+ }
+
+ /* allocate a DMA buffer */
+ ltdmabuf = (unsigned char *) dma_mem_alloc(1000);
+ if (!ltdmabuf) {
+ printk(KERN_ERR "ltpc: mem alloc failed\n");
+ err = -ENOMEM;
+ goto out2;
+ }
+
+ ltdmacbuf = <dmabuf[800];
+
+ if(debug & DEBUG_VERBOSE) {
+ printk("ltdmabuf pointer %08lx\n",(unsigned long) ltdmabuf);
+ }
+
+ /* reset the card */
+
+ inb_p(io+1);
+ inb_p(io+3);
+
+ msleep(20);
+
+ inb_p(io+0);
+ inb_p(io+2);
+ inb_p(io+7); /* clear reset */
+ inb_p(io+4);
+ inb_p(io+5);
+ inb_p(io+5); /* enable dma */
+ inb_p(io+6); /* tri-state interrupt line */
+
+ ssleep(1);
+
+ /* now, figure out which dma channel we're using, unless it's
+ already been specified */
+ /* well, 0 is a legal DMA channel, but the LTPC card doesn't
+ use it... */
+ dma = ltpc_probe_dma(io, dma);
+ if (!dma) { /* no dma channel */
+ printk(KERN_ERR "No DMA channel found on ltpc card.\n");
+ err = -ENODEV;
+ goto out3;
+ }
+
+ /* print out friendly message */
+ if(irq)
+ printk(KERN_INFO "Apple/Farallon LocalTalk-PC card at %03x, IR%d, DMA%d.\n",io,irq,dma);
+ else
+ printk(KERN_INFO "Apple/Farallon LocalTalk-PC card at %03x, DMA%d. Using polled mode.\n",io,dma);
+
+ dev->netdev_ops = <pc_netdev;
+ dev->base_addr = io;
+ dev->irq = irq;
+ dev->dma = dma;
+
+ /* the card will want to send a result at this point */
+ /* (I think... leaving out this part makes the kernel crash,
+ so I put it back in...) */
+
+ f=claim_dma_lock();
+ disable_dma(dma);
+ clear_dma_ff(dma);
+ set_dma_mode(dma,DMA_MODE_READ);
+ set_dma_addr(dma,virt_to_bus(ltdmabuf));
+ set_dma_count(dma,0x100);
+ enable_dma(dma);
+ release_dma_lock(f);
+
+ (void) inb_p(io+3);
+ (void) inb_p(io+2);
+ timeout = jiffies+100*HZ/100;
+
+ while(time_before(jiffies, timeout)) {
+ if( 0xf9 == inb_p(io+6))
+ break;
+ schedule();
+ }
+
+ if(debug & DEBUG_VERBOSE) {
+ printk("setting up timer and irq\n");
+ }
+
+ /* grab it and don't let go :-) */
+ if (irq && request_irq( irq, ltpc_interrupt, 0, "ltpc", dev) >= 0)
+ {
+ (void) inb_p(io+7); /* enable interrupts from board */
+ (void) inb_p(io+7); /* and reset irq line */
+ } else {
+ if( irq )
+ printk(KERN_ERR "ltpc: IRQ already in use, using polled mode.\n");
+ dev->irq = 0;
+ /* polled mode -- 20 times per second */
+ /* this is really, really slow... should it poll more often? */
+ init_timer(<pc_timer);
+ ltpc_timer.function=ltpc_poll;
+ ltpc_timer.data = (unsigned long) dev;
+
+ ltpc_timer.expires = jiffies + HZ/20;
+ add_timer(<pc_timer);
+ }
+ err = register_netdev(dev);
+ if (err)
+ goto out4;
+
+ return NULL;
+out4:
+ del_timer_sync(<pc_timer);
+ if (dev->irq)
+ free_irq(dev->irq, dev);
+out3:
+ free_pages((unsigned long)ltdmabuf, get_order(1000));
+out2:
+ release_region(io, 8);
+out1:
+ free_netdev(dev);
+out:
+ return ERR_PTR(err);
+}
+
+#ifndef MODULE
+/* handles "ltpc=io,irq,dma" kernel command lines */
+static int __init ltpc_setup(char *str)
+{
+ int ints[5];
+
+ str = get_options(str, ARRAY_SIZE(ints), ints);
+
+ if (ints[0] == 0) {
+ if (str && !strncmp(str, "auto", 4)) {
+ /* do nothing :-) */
+ }
+ else {
+ /* usage message */
+ printk (KERN_ERR
+ "ltpc: usage: ltpc=auto|iobase[,irq[,dma]]\n");
+ return 0;
+ }
+ } else {
+ io = ints[1];
+ if (ints[0] > 1) {
+ irq = ints[2];
+ }
+ if (ints[0] > 2) {
+ dma = ints[3];
+ }
+ /* ignore any other parameters */
+ }
+ return 1;
+}
+
+__setup("ltpc=", ltpc_setup);
+#endif /* MODULE */
+
+static struct net_device *dev_ltpc;
+
+#ifdef MODULE
+
+MODULE_LICENSE("GPL");
+module_param(debug, int, 0);
+module_param(io, int, 0);
+module_param(irq, int, 0);
+module_param(dma, int, 0);
+
+
+static int __init ltpc_module_init(void)
+{
+ if(io == 0)
+ printk(KERN_NOTICE
+ "ltpc: Autoprobing is not recommended for modules\n");
+
+ dev_ltpc = ltpc_probe();
+ return PTR_ERR_OR_ZERO(dev_ltpc);
+}
+module_init(ltpc_module_init);
+#endif
+
+static void __exit ltpc_cleanup(void)
+{
+
+ if(debug & DEBUG_VERBOSE) printk("unregister_netdev\n");
+ unregister_netdev(dev_ltpc);
+
+ ltpc_timer.data = 0; /* signal the poll routine that we're done */
+
+ del_timer_sync(<pc_timer);
+
+ if(debug & DEBUG_VERBOSE) printk("freeing irq\n");
+
+ if (dev_ltpc->irq)
+ free_irq(dev_ltpc->irq, dev_ltpc);
+
+ if(debug & DEBUG_VERBOSE) printk("freeing dma\n");
+
+ if (dev_ltpc->dma)
+ free_dma(dev_ltpc->dma);
+
+ if(debug & DEBUG_VERBOSE) printk("freeing ioaddr\n");
+
+ if (dev_ltpc->base_addr)
+ release_region(dev_ltpc->base_addr,8);
+
+ free_netdev(dev_ltpc);
+
+ if(debug & DEBUG_VERBOSE) printk("free_pages\n");
+
+ free_pages( (unsigned long) ltdmabuf, get_order(1000));
+
+ if(debug & DEBUG_VERBOSE) printk("returning from cleanup_module\n");
+}
+
+module_exit(ltpc_cleanup);
Code Review / kvmfornfv.git / blobdiff