diff options
Diffstat (limited to 'drivers/net/appletalk/ltpc.c')
| -rw-r--r-- | drivers/net/appletalk/ltpc.c | 1313 |
1 files changed, 1313 insertions, 0 deletions
diff --git a/drivers/net/appletalk/ltpc.c b/drivers/net/appletalk/ltpc.c new file mode 100644 index 00000000000..ad8e943231a --- /dev/null +++ b/drivers/net/appletalk/ltpc.c @@ -0,0 +1,1313 @@ +/*** 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/slab.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 <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 net_device_stats stats; + 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); + } + return; +} + + +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 int ltpc_xmit(struct sk_buff *skb, struct net_device *dev); +static struct net_device_stats *ltpc_get_stats(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 net_device_stats *stats = &((struct ltpc_private *)dev->priv)->stats; + 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->mac.raw = skb->data; /* save pointer to llap header */ + skb_pull(skb,3); + + /* copy ddp(s,e)hdr + contents */ + memcpy(skb->data,(void*)ltdmabuf,len); + + skb->h.raw = skb->data; + + stats->rx_packets++; + stats->rx_bytes+=skb->len; + + /* toss it onwards */ + netif_rx(skb); + dev->last_rx = jiffies; + return 0; +} + +/* the handler for the board interrupt */ + +static irqreturn_t +ltpc_interrupt(int irq, void *dev_id, struct pt_regs *reg_ptr) +{ + 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 atalk_addr *aa = &((struct ltpc_private *)dev->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_hard_header (struct sk_buff *skb, struct net_device *dev, + unsigned short type, void *daddr, void *saddr, unsigned len) +{ + if(debug & DEBUG_VERBOSE) + printk("ltpc_hard_header called for device %s\n", + dev->name); + return 0; +} + +static int ltpc_poll_counter; + +static void ltpc_poll(unsigned long l) +{ + struct net_device *dev = (struct net_device *) l; + + del_timer(<pc_timer); + + if(debug & DEBUG_VERBOSE) { + if (!ltpc_poll_counter) { + ltpc_poll_counter = 50; + printk("ltpc poll is alive\n"); + } + ltpc_poll_counter--; + } + + if (!dev) + return; /* we've been downed */ + + /* poll 20 times per second */ + idle(dev); + ltpc_timer.expires = jiffies + HZ/20; + + add_timer(<pc_timer); +} + +/* DDP to LLAP translation */ + +static int 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 + */ + + struct net_device_stats *stats = &((struct ltpc_private *)dev->priv)->stats; + + int i; + struct lt_sendlap cbuf; + + 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->h.raw=skb->data; + + if(debug & DEBUG_UPPER) { + printk("command "); + for(i=0;i<6;i++) + printk("%02x ",((unsigned char *)&cbuf)[i]); + printk("\n"); + } + + do_write(dev,&cbuf,sizeof(cbuf),skb->h.raw,skb->len); + + if(debug & DEBUG_UPPER) { + printk("sent %d ddp bytes\n",skb->len); + for(i=0;i<skb->len;i++) printk("%02x ",skb->h.raw[i]); + printk("\n"); + } + + stats->tx_packets++; + stats->tx_bytes+=skb->len; + + dev_kfree_skb(skb); + return 0; +} + +static struct net_device_stats *ltpc_get_stats(struct net_device *dev) +{ + struct net_device_stats *stats = &((struct ltpc_private *) dev->priv)->stats; + return stats; +} + +/* 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; +} + +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_netdev(sizeof(struct ltpc_private), "lt%d", ltalk_setup); + if (!dev) + goto out; + + SET_MODULE_OWNER(dev); + + /* 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); + + set_current_state(TASK_UNINTERRUPTIBLE); + schedule_timeout(2*HZ/100); + + 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 */ + + set_current_state(TASK_UNINTERRUPTIBLE); + schedule_timeout(HZ); + + /* 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); + + /* Fill in the fields of the device structure with ethernet-generic values. */ + dev->hard_start_xmit = ltpc_xmit; + dev->hard_header = ltpc_hard_header; + dev->get_stats = ltpc_get_stats; + + /* add the ltpc-specific things */ + dev->do_ioctl = <pc_ioctl; + + dev->set_multicast_list = &set_multicast_list; + dev->mc_list = NULL; + 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, <pc_interrupt, 0, "ltpc", dev) >= 0) + { + (void) inb_p(io+7); /* enable interrupts from board */ + (void) inb_p(io+7); /* and reset irq line */ + } else { + if( irq ) + printk(KERN_ERR "ltpc: IRQ already in use, using polled mode.\n"); + dev->irq = 0; + /* polled mode -- 20 times per second */ + /* this is really, really slow... should it poll more often? */ + init_timer(<pc_timer); + ltpc_timer.function=ltpc_poll; + ltpc_timer.data = (unsigned long) dev; + + ltpc_timer.expires = jiffies + HZ/20; + add_timer(<pc_timer); + } + err = register_netdev(dev); + if (err) + goto out4; + + return NULL; +out4: + del_timer_sync(<pc_timer); + if (dev->irq) + free_irq(dev->irq, dev); +out3: + free_pages((unsigned long)ltdmabuf, get_order(1000)); +out2: + release_region(io, 8); +out1: + free_netdev(dev); +out: + return ERR_PTR(err); +} + +#ifndef MODULE +/* handles "ltpc=io,irq,dma" kernel command lines */ +static int __init ltpc_setup(char *str) +{ + int ints[5]; + + str = get_options(str, ARRAY_SIZE(ints), ints); + + if (ints[0] == 0) { + if (str && !strncmp(str, "auto", 4)) { + /* do nothing :-) */ + } + else { + /* usage message */ + printk (KERN_ERR + "ltpc: usage: ltpc=auto|iobase[,irq[,dma]]\n"); + return 0; + } + } else { + io = ints[1]; + if (ints[0] > 1) { + irq = ints[2]; + } + if (ints[0] > 2) { + dma = ints[3]; + } + /* ignore any other paramters */ + } + 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); + + +int __init init_module(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; +} +#endif + +static void __exit ltpc_cleanup(void) +{ + + if(debug & DEBUG_VERBOSE) printk("unregister_netdev\n"); + unregister_netdev(dev_ltpc); + + ltpc_timer.data = 0; /* signal the poll routine that we're done */ + + del_timer_sync(<pc_timer); + + if(debug & DEBUG_VERBOSE) printk("freeing irq\n"); + + if (dev_ltpc->irq) + free_irq(dev_ltpc->irq, dev_ltpc); + + if(debug & DEBUG_VERBOSE) printk("freeing dma\n"); + + if (dev_ltpc->dma) + free_dma(dev_ltpc->dma); + + if(debug & DEBUG_VERBOSE) printk("freeing ioaddr\n"); + + if (dev_ltpc->base_addr) + release_region(dev_ltpc->base_addr,8); + + free_netdev(dev_ltpc); + + if(debug & DEBUG_VERBOSE) printk("free_pages\n"); + + free_pages( (unsigned long) ltdmabuf, get_order(1000)); + + if(debug & DEBUG_VERBOSE) printk("returning from cleanup_module\n"); +} + +module_exit(ltpc_cleanup); |