+++ /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 <net/Space.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->addr_len=1;
- dev_addr_set(dev, &aa->s_node);
-
- 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,
-};
-
-static 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
-
-static struct net_device *dev_ltpc;
-
-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);
-
-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);
projects / kernel.git / commitdiff