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linux/drivers/net/appletalk/ltpc.c
Eric Dumazet 807540baae drivers/net: return operator cleanup 
Change "return (EXPR);" to "return EXPR;"

return is not a function, parentheses are not required.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-09-26 18:34:29 -07:00

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/*** 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/system.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 = (unsigned char *) cbuf;
qels[i].cbuflen = cbuflen;
qels[i].dbuf = (unsigned char *) 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 = (unsigned char *) cbuf;
qels[i].cbuflen = cbuflen;
qels[i].dbuf = (unsigned char *) 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 = &ltpc_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(&ltpc_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(&ltpc_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_multicast_list = 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 = &ltdmabuf[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 = &ltpc_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(&ltpc_timer);
ltpc_timer.function=ltpc_poll;
ltpc_timer.data = (unsigned long) dev;
ltpc_timer.expires = jiffies + HZ/20;
add_timer(&ltpc_timer);
}
err = register_netdev(dev);
if (err)
goto out4;
return NULL;
out4:
del_timer_sync(&ltpc_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();
if (IS_ERR(dev_ltpc))
return PTR_ERR(dev_ltpc);
return 0;
}
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(&ltpc_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);
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