/*** 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 struct net_device *ltpc_timer_dev;
|
|
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(struct timer_list *unused)
|
{
|
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--;
|
}
|
|
/* poll 20 times per second */
|
idle(ltpc_timer_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? */
|
ltpc_timer_dev = dev;
|
timer_setup(<pc_timer, ltpc_poll, 0);
|
|
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_hw(io, int, ioport, 0);
|
module_param_hw(irq, int, irq, 0);
|
module_param_hw(dma, int, dma, 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);
|
|
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);
|
