/*** ltpc.c -- a driver for the LocalTalk PC card. * * Copyright (c) 1995,1996 Bradford W. Johnson * * 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 * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* 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;icbuf[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;iQWrite) { 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 netdev_tx_t ltpc_xmit(struct sk_buff *skb, struct net_device *dev); static int read_30 ( struct net_device *dev) { lt_command c; c.getflags.command = LT_GETFLAGS; return do_read(dev, &c, sizeof(c.getflags),&c,0); } static int set_30 (struct net_device *dev,int x) { lt_command c; c.setflags.command = LT_SETFLAGS; c.setflags.flags = x; return do_write(dev, &c, sizeof(c.setflags),&c,0); } /* LLAP to DDP translation */ static int sendup_buffer (struct net_device *dev) { /* on entry, command is in ltdmacbuf, data in ltdmabuf */ /* called from idle, non-reentrant */ int dnode, snode, llaptype, len; int sklen; struct sk_buff *skb; struct lt_rcvlap *ltc = (struct lt_rcvlap *) ltdmacbuf; if (ltc->command != LT_RCVLAP) { printk("unknown command 0x%02x from ltpc card\n",ltc->command); return(-1); } dnode = ltc->dnode; snode = ltc->snode; llaptype = ltc->laptype; len = ltc->length; sklen = len; if (llaptype == 1) sklen += 8; /* correct for short ddp */ if(sklen > 800) { printk(KERN_INFO "%s: nonsense length in ltpc command 0x14: 0x%08x\n", dev->name,sklen); return -1; } if ( (llaptype==0) || (llaptype>2) ) { printk(KERN_INFO "%s: unknown LLAP type: %d\n",dev->name,llaptype); return -1; } skb = dev_alloc_skb(3+sklen); if (skb == NULL) { printk("%s: dropping packet due to memory squeeze.\n", dev->name); return -1; } skb->dev = dev; if (sklen > len) skb_reserve(skb,8); skb_put(skb,len+3); skb->protocol = htons(ETH_P_LOCALTALK); /* add LLAP header */ skb->data[0] = dnode; skb->data[1] = snode; skb->data[2] = llaptype; skb_reset_mac_header(skb); /* save pointer to llap header */ skb_pull(skb,3); /* copy ddp(s,e)hdr + contents */ skb_copy_to_linear_data(skb, ltdmabuf, len); skb_reset_transport_header(skb); dev->stats.rx_packets++; dev->stats.rx_bytes += skb->len; /* toss it onwards */ netif_rx(skb); return 0; } /* the handler for the board interrupt */ static irqreturn_t ltpc_interrupt(int irq, void *dev_id) { struct net_device *dev = dev_id; if (dev==NULL) { printk("ltpc_interrupt: unknown device.\n"); return IRQ_NONE; } inb_p(dev->base_addr+6); /* disable further interrupts from board */ idle(dev); /* handle whatever is coming in */ /* idle re-enables interrupts from board */ return IRQ_HANDLED; } /*** * * The ioctls that the driver responds to are: * * SIOCSIFADDR -- do probe using the passed node hint. * SIOCGIFADDR -- return net, node. * * some of this stuff should be done elsewhere. * ***/ static int ltpc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) { struct sockaddr_at *sa = (struct sockaddr_at *) &ifr->ifr_addr; /* we'll keep the localtalk node address in dev->pa_addr */ struct ltpc_private *ltpc_priv = netdev_priv(dev); struct atalk_addr *aa = <pc_priv->my_addr; struct lt_init c; int ltflags; if(debug & DEBUG_VERBOSE) printk("ltpc_ioctl called\n"); switch(cmd) { case SIOCSIFADDR: aa->s_net = sa->sat_addr.s_net; /* this does the probe and returns the node addr */ c.command = LT_INIT; c.hint = sa->sat_addr.s_node; aa->s_node = do_read(dev,&c,sizeof(c),&c,0); /* get all llap frames raw */ ltflags = read_30(dev); ltflags |= LT_FLAG_ALLLAP; set_30 (dev,ltflags); dev->broadcast[0] = 0xFF; dev->dev_addr[0] = aa->s_node; dev->addr_len=1; return 0; case SIOCGIFADDR: sa->sat_addr.s_net = aa->s_net; sa->sat_addr.s_node = aa->s_node; return 0; default: return -EINVAL; } } static void set_multicast_list(struct net_device *dev) { /* This needs to be present to keep netatalk happy. */ /* Actually netatalk needs fixing! */ } static int ltpc_poll_counter; static void ltpc_poll(unsigned long l) { struct net_device *dev = (struct net_device *) l; del_timer(<pc_timer); if(debug & DEBUG_VERBOSE) { if (!ltpc_poll_counter) { ltpc_poll_counter = 50; printk("ltpc poll is alive\n"); } ltpc_poll_counter--; } if (!dev) return; /* we've been downed */ /* poll 20 times per second */ idle(dev); ltpc_timer.expires = jiffies + HZ/20; add_timer(<pc_timer); } /* DDP to LLAP translation */ static netdev_tx_t ltpc_xmit(struct sk_buff *skb, struct net_device *dev) { /* in kernel 1.3.xx, on entry skb->data points to ddp header, * and skb->len is the length of the ddp data + ddp header */ int i; struct lt_sendlap cbuf; unsigned char *hdr; cbuf.command = LT_SENDLAP; cbuf.dnode = skb->data[0]; cbuf.laptype = skb->data[2]; skb_pull(skb,3); /* skip past LLAP header */ cbuf.length = skb->len; /* this is host order */ skb_reset_transport_header(skb); if(debug & DEBUG_UPPER) { printk("command "); for(i=0;i<6;i++) printk("%02x ",((unsigned char *)&cbuf)[i]); printk("\n"); } hdr = skb_transport_header(skb); do_write(dev, &cbuf, sizeof(cbuf), hdr, skb->len); if(debug & DEBUG_UPPER) { printk("sent %d ddp bytes\n",skb->len); for (i = 0; i < skb->len; i++) printk("%02x ", hdr[i]); printk("\n"); } dev->stats.tx_packets++; dev->stats.tx_bytes += skb->len; dev_kfree_skb(skb); return NETDEV_TX_OK; } /* initialization stuff */ static int __init ltpc_probe_dma(int base, int dma) { int want = (dma == 3) ? 2 : (dma == 1) ? 1 : 3; unsigned long timeout; unsigned long f; if (want & 1) { if (request_dma(1,"ltpc")) { want &= ~1; } else { f=claim_dma_lock(); disable_dma(1); clear_dma_ff(1); set_dma_mode(1,DMA_MODE_WRITE); set_dma_addr(1,virt_to_bus(ltdmabuf)); set_dma_count(1,sizeof(struct lt_mem)); enable_dma(1); release_dma_lock(f); } } if (want & 2) { if (request_dma(3,"ltpc")) { want &= ~2; } else { f=claim_dma_lock(); disable_dma(3); clear_dma_ff(3); set_dma_mode(3,DMA_MODE_WRITE); set_dma_addr(3,virt_to_bus(ltdmabuf)); set_dma_count(3,sizeof(struct lt_mem)); enable_dma(3); release_dma_lock(f); } } /* set up request */ /* FIXME -- do timings better! */ ltdmabuf[0] = LT_READMEM; ltdmabuf[1] = 1; /* mailbox */ ltdmabuf[2] = 0; ltdmabuf[3] = 0; /* address */ ltdmabuf[4] = 0; ltdmabuf[5] = 1; /* read 0x0100 bytes */ ltdmabuf[6] = 0; /* dunno if this is necessary */ inb_p(io+1); inb_p(io+0); timeout = jiffies+100*HZ/100; while(time_before(jiffies, timeout)) { if ( 0xfa == inb_p(io+6) ) break; } inb_p(io+3); inb_p(io+2); while(time_before(jiffies, timeout)) { if ( 0xfb == inb_p(io+6) ) break; } /* release the other dma channel (if we opened both of them) */ if ((want & 2) && (get_dma_residue(3)==sizeof(struct lt_mem))) { want &= ~2; free_dma(3); } if ((want & 1) && (get_dma_residue(1)==sizeof(struct lt_mem))) { want &= ~1; free_dma(1); } if (!want) return 0; return (want & 2) ? 3 : 1; } static const struct net_device_ops ltpc_netdev = { .ndo_start_xmit = ltpc_xmit, .ndo_do_ioctl = ltpc_ioctl, .ndo_set_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 = <dmabuf[800]; if(debug & DEBUG_VERBOSE) { printk("ltdmabuf pointer %08lx\n",(unsigned long) ltdmabuf); } /* reset the card */ inb_p(io+1); inb_p(io+3); msleep(20); inb_p(io+0); inb_p(io+2); inb_p(io+7); /* clear reset */ inb_p(io+4); inb_p(io+5); inb_p(io+5); /* enable dma */ inb_p(io+6); /* tri-state interrupt line */ ssleep(1); /* now, figure out which dma channel we're using, unless it's already been specified */ /* well, 0 is a legal DMA channel, but the LTPC card doesn't use it... */ dma = ltpc_probe_dma(io, dma); if (!dma) { /* no dma channel */ printk(KERN_ERR "No DMA channel found on ltpc card.\n"); err = -ENODEV; goto out3; } /* print out friendly message */ if(irq) printk(KERN_INFO "Apple/Farallon LocalTalk-PC card at %03x, IR%d, DMA%d.\n",io,irq,dma); else printk(KERN_INFO "Apple/Farallon LocalTalk-PC card at %03x, DMA%d. Using polled mode.\n",io,dma); dev->netdev_ops = <pc_netdev; dev->base_addr = io; dev->irq = irq; dev->dma = dma; /* the card will want to send a result at this point */ /* (I think... leaving out this part makes the kernel crash, so I put it back in...) */ f=claim_dma_lock(); disable_dma(dma); clear_dma_ff(dma); set_dma_mode(dma,DMA_MODE_READ); set_dma_addr(dma,virt_to_bus(ltdmabuf)); set_dma_count(dma,0x100); enable_dma(dma); release_dma_lock(f); (void) inb_p(io+3); (void) inb_p(io+2); timeout = jiffies+100*HZ/100; while(time_before(jiffies, timeout)) { if( 0xf9 == inb_p(io+6)) break; schedule(); } if(debug & DEBUG_VERBOSE) { printk("setting up timer and irq\n"); } /* grab it and don't let go :-) */ if (irq && request_irq( irq, ltpc_interrupt, 0, "ltpc", dev) >= 0) { (void) inb_p(io+7); /* enable interrupts from board */ (void) inb_p(io+7); /* and reset irq line */ } else { if( irq ) printk(KERN_ERR "ltpc: IRQ already in use, using polled mode.\n"); dev->irq = 0; /* polled mode -- 20 times per second */ /* this is really, really slow... should it poll more often? */ init_timer(<pc_timer); ltpc_timer.function=ltpc_poll; ltpc_timer.data = (unsigned long) dev; ltpc_timer.expires = jiffies + HZ/20; add_timer(<pc_timer); } err = register_netdev(dev); if (err) goto out4; return NULL; out4: del_timer_sync(<pc_timer); if (dev->irq) free_irq(dev->irq, dev); out3: free_pages((unsigned long)ltdmabuf, get_order(1000)); out2: release_region(io, 8); out1: free_netdev(dev); out: return ERR_PTR(err); } #ifndef MODULE /* handles "ltpc=io,irq,dma" kernel command lines */ static int __init ltpc_setup(char *str) { int ints[5]; str = get_options(str, ARRAY_SIZE(ints), ints); if (ints[0] == 0) { if (str && !strncmp(str, "auto", 4)) { /* do nothing :-) */ } else { /* usage message */ printk (KERN_ERR "ltpc: usage: ltpc=auto|iobase[,irq[,dma]]\n"); return 0; } } else { io = ints[1]; if (ints[0] > 1) { irq = ints[2]; } if (ints[0] > 2) { dma = ints[3]; } /* ignore any other parameters */ } return 1; } __setup("ltpc=", ltpc_setup); #endif /* MODULE */ static struct net_device *dev_ltpc; #ifdef MODULE MODULE_LICENSE("GPL"); module_param(debug, int, 0); module_param(io, int, 0); module_param(irq, int, 0); module_param(dma, int, 0); static int __init ltpc_module_init(void) { if(io == 0) printk(KERN_NOTICE "ltpc: Autoprobing is not recommended for modules\n"); dev_ltpc = ltpc_probe(); 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(<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);