/*** 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 1.8 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 * * 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=0; #define DEBUG_VERBOSE 1 #define DEBUG_UPPER 2 #define DEBUG_LOWER 4 #ifdef MODULE #include #include #endif #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" /* function prototypes */ static int do_read(struct device *dev, void *cbuf, int cbuflen, void *dbuf, int dbuflen); static int sendup_buffer (struct device *dev); /* Dma Memory related stuff, cribbed directly from 3c505.c */ /* Pure 2^n version of get_order */ static inline int __get_order(unsigned long size) { int order; size = (size - 1) >> (PAGE_SHIFT - 1); order = -1; do { size >>= 1; order++; } while (size); return order; } static unsigned long dma_mem_alloc(int size) { int order = __get_order(size); return __get_dma_pages(GFP_KERNEL, order); } static unsigned char *ltdmabuf; static unsigned char *ltdmacbuf; struct ltpc_private { struct net_device_stats stats; struct at_addr my_addr; }; struct xmitQel { struct xmitQel *next; unsigned char *cbuf; short cbuflen; unsigned char *dbuf; short dbuflen; unsigned char QWrite; /* read or write data */ unsigned char mailbox; }; static struct xmitQel *xmQhd=NULL,*xmQtl=NULL; static void enQ(struct xmitQel *qel) { unsigned long flags; qel->next = NULL; save_flags(flags); cli(); if (xmQtl) { xmQtl->next = qel; } else { xmQhd = qel; } xmQtl = qel; restore_flags(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; save_flags(flags); cli(); if (xmQhd) { qel = xmQhd; xmQhd = qel->next; if(!xmQhd) xmQtl = NULL; } restore_flags(flags); if ((debug&DEBUG_LOWER) && qel) { int n; printk("ltpc: dequeued command "); n = qel->cbuflen; if (n>100) n=100; for(i=0;icbuf[i]); printk("\n"); } return qel; } static struct xmitQel qels[16]; 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 device *dev, int c) { /* returns true if it stayed c */ /* this uses base+6, but it's ok */ int i; int timeout; /* twenty second or so total */ for(i=0;i<20000;i++) { if ( c != inb_p(dev->base_addr+6) ) return 0; for(timeout=loops_per_sec/1000; timeout > 0; timeout--) ; } return 1; /* timed out */ } static int getmbox(void) { unsigned long flags; int i; save_flags(flags); cli(); for(i=1;i<16;i++) if(!mboxinuse[i]) { mboxinuse[i]=1; restore_flags(flags); return i; } restore_flags(flags); return 0; } static void handlefc(struct device *dev) { /* called *only* from idle, non-reentrant */ int dma = dev->dma; int base = dev->base_addr; 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); inb_p(base+3); inb_p(base+2); if ( wait_timeout(dev,0xfc) ) printk("timed out in handlefc\n"); } static void handlefd(struct device *dev) { int dma = dev->dma; int base = dev->base_addr; 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); 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 device *dev) { /* called *only* from idle, non-reentrant */ /* on entry, 0xfb and ltdmabuf holds data */ int dma = dev->dma; int base = dev->base_addr; 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); inb_p(base+3); inb_p(base+2); if ( wait_timeout(dev,0xfb) ) { printk("timed out in handlewrite, dma res %d\n", get_dma_residue(dev->dma) ); } } static void handleread(struct device *dev) { /* on entry, 0xfb */ /* on exit, ltdmabuf holds data */ int dma = dev->dma; int base = dev->base_addr; 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); inb_p(base+3); inb_p(base+2); if ( wait_timeout(dev,0xfb) ) printk("timed out in handleread\n"); } static void handlecommand(struct device *dev) { /* on entry, 0xfa and ltdmacbuf holds command */ int dma = dev->dma; int base = dev->base_addr; 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); inb_p(base+3); inb_p(base+2); if ( wait_timeout(dev,0xfa) ) printk("timed out in handlecommand\n"); } static unsigned char rescbuf[2] = {0,0}; static unsigned char resdbuf[2]; static int QInIdle=0; /* 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 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=0; int oops; int i; int statusPort = dev->base_addr+6; save_flags(flags); cli(); if(QInIdle) { restore_flags(flags); return; } QInIdle = 1; restore_flags(flags); (void) inb_p(statusPort); /* this tri-states the IRQ line */ oops = 100; loop: if (0>oops--) { printk("idle: looped too many times\n"); goto done; } state = inb_p(statusPort); if (state != inb_p(statusPort)) goto loop; switch(state) { case 0xfc: if (debug&DEBUG_LOWER) printk("idle: fc\n"); handlefc(dev); break; case 0xfd: if(debug&DEBUG_LOWER) printk("idle: fd\n"); handlefd(dev); break; case 0xf9: 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: 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); 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 7 takes it out of tri-state (but still high) */ /* the second resets it */ /* note that after this point, any read of 6 will trigger an interrupt */ if (dev->irq) { inb_p(dev->base_addr+7); inb_p(dev->base_addr+7); } return; } static int do_write(struct 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 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 device *dev); static struct net_device_stats *ltpc_get_stats(struct device *dev); static int ltpc_open(struct device *dev) { #ifdef MODULE MOD_INC_USE_COUNT; #endif return 0; } static int ltpc_close(struct device *dev) { #ifdef MODULE MOD_DEC_USE_COUNT; #endif return 0; } static int read_30 ( struct 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 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); } static int sendup_buffer (struct 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); return 0; } /* the handler for the board interrupt */ static void ltpc_interrupt(int irq, void *dev_id, struct pt_regs *reg_ptr) { struct device *dev = dev_id; if (dev==NULL) { printk("ltpc_interrupt: unknown device.\n"); return; } 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; } /*** * * 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 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 at_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 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 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_init(struct device *dev) { /* Initialize the device structure. */ /* Fill in the fields of the device structure with ethernet-generic values. */ ltalk_setup(dev); dev->hard_start_xmit = ltpc_xmit; dev->hard_header = ltpc_hard_header; dev->priv = kmalloc(sizeof(struct ltpc_private), GFP_KERNEL); if(!dev->priv) { printk(KERN_INFO "%s: could not allocate statistics buffer\n", dev->name); return -ENOMEM; } memset(dev->priv, 0, sizeof(struct ltpc_private)); dev->get_stats = ltpc_get_stats; dev->open = ltpc_open; dev->stop = ltpc_close; /* add the ltpc-specific things */ dev->do_ioctl = <pc_ioctl; dev->set_multicast_list = &set_multicast_list; dev->mc_list = NULL; return 0; } static int ltpc_poll_counter = 0; static void ltpc_poll(unsigned long l) { struct device *dev = (struct 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 */ if (dev->irq) { /* we're set up for interrupts */ if (0xf8 != inb_p(dev->base_addr+7)) { /* trigger an interrupt */ (void) inb_p(dev->base_addr+6); } ltpc_timer.expires = jiffies+100; } else { /* we're strictly polling mode */ idle(dev); ltpc_timer.expires = jiffies+5; } add_timer(<pc_timer); } static int ltpc_xmit(struct sk_buff *skb, struct 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;ilen;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 device *dev) { struct net_device_stats *stats = &((struct ltpc_private *) dev->priv)->stats; return stats; } static unsigned short irqhitmask; __initfunc(static void lt_probe_handler(int irq, void *dev_id, struct pt_regs *reg_ptr)) { irqhitmask |= 1<jiffies) ; /* wait for strays */ straymask = irqhitmask; /* pick up any strays */ /* if someone already owns this address, don't probe */ if (!check_region(0x220,8)) { inb_p(0x227); inb_p(0x227); x=inb_p(0x226); timeout = jiffies+2; while(timeout>jiffies) ; if(straymask != irqhitmask) base = 0x220; } if (!check_region(0x240,8)) { inb_p(0x247); inb_p(0x247); y=inb_p(0x246); timeout = jiffies+2; while(timeout>jiffies) ; if(straymask != irqhitmask) base = 0x240; } /* at this point, either we have an irq and the base addr, or * there isn't any irq and we don't know the base address, but * in either event the card is no longer latched in reset and * the irq request line is tri-stated. */ cli(); if (!probe3) free_irq(3,dev); if (!probe4) free_irq(4,dev); if (!probe9) free_irq(9,dev); sti(); irqhitmask &= ~straymask; irq = ffz(~irqhitmask); if (irqhitmask != 1<=0xf0) ) base = 0x220; } if (!check_region(0x240,8)) { y = inb_p(0x240+6); if ( (y!=0xff) && (y>=0xf0) ) base = 0x240; } } if(base) { request_region(base,8,"ltpc"); } else { printk("LocalTalk card not found; 220 = %02x, 240 = %02x.\n",x,y); restore_flags(flags); return -1; } ltdmabuf = (unsigned char *) dma_mem_alloc(1000); if (ltdmabuf) ltdmacbuf = <dmabuf[800]; if (!ltdmabuf) { printk("ltpc: mem alloc failed\n"); restore_flags(flags); return(-1); } if(debug&DEBUG_VERBOSE) { printk("ltdmabuf pointer %08lx\n",(unsigned long) ltdmabuf); } /* reset the card */ inb_p(base+1); inb_p(base+3); timeout = jiffies+2; while(timeout>jiffies) ; /* hold it in reset for a coupla jiffies */ inb_p(base+0); inb_p(base+2); inb_p(base+7); /* clear reset */ inb_p(base+4); inb_p(base+5); inb_p(base+5); /* enable dma */ inb_p(base+6); /* tri-state interrupt line */ timeout = jiffies+100; while(timeout>jiffies) { /* wait for the card to complete initialization */ } /* now, figure out which dma channel we're using */ /* set up both dma 1 and 3 for read call */ if (!request_dma(1,"ltpc")) { 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); dma|=1; } if (!request_dma(3,"ltpc")) { 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); dma|=2; } /* set up request */ /* FIXME -- do timings better! */ ltdmabuf[0] = 2; /* read request */ 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(base+1); inb_p(base+0); timeout = jiffies+100; while(timeout>jiffies) { if ( 0xfa == inb_p(base+6) ) break; } inb_p(base+3); inb_p(base+2); while(timeout>jiffies) { if ( 0xfb == inb_p(base+6) ) break; } /* release the other dma channel */ if ( (dma&0x2) && (get_dma_residue(3)==sizeof(struct lt_mem)) ){ dma&=1; free_dma(3); } if ( (dma&0x1) && (get_dma_residue(1)==sizeof(struct lt_mem)) ){ dma&=0x2; free_dma(1); } if (!dma) { /* no dma channel */ printk("No DMA channel found on ltpc card.\n"); restore_flags(flags); return -1; } /* fix up dma number */ dma|=1; /* set up read */ if(irq) printk("LocalTalk card found at %03x, IR%d, DMA%d.\n",base,irq,dma); else printk("LocalTalk card found at %03x, DMA%d. Using polled mode.\n",base,dma); dev->base_addr = base; dev->irq = irq; dev->dma = dma; if(debug&DEBUG_VERBOSE) { printk("finishing up transfer\n"); } 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); (void) inb_p(base+3); (void) inb_p(base+2); timeout = jiffies+100; while(timeout>jiffies) { if( 0xf9 == inb_p(base+6)) break; } if(debug&DEBUG_VERBOSE) { printk("setting up timer and irq\n"); } init_timer(<pc_timer); ltpc_timer.function=ltpc_poll; ltpc_timer.data = (unsigned long) dev; if (irq) { (void) request_irq( irq, <pc_interrupt, 0, "ltpc", dev); (void) inb_p(base+7); /* enable interrupts from board */ (void) inb_p(base+7); /* and reset irq line */ ltpc_timer.expires = 100; /* poll it once per second just in case */ } else { ltpc_timer.expires = 5; /* polled mode -- 20 times per second */ } ltpc_timer.expires += jiffies; /* 1.2 to 1.3 change... */ add_timer(<pc_timer); restore_flags(flags); return 0; } #ifdef MODULE static char dev_name[8]; static struct device dev_ltpc = { dev_name, 0, 0, 0, 0, 0x0, 0, 0, 0, 0, NULL, ltpc_probe }; int init_module(void) { /* Find a name for this unit */ int err=dev_alloc_name(&dev_ltpc,"lt%d"); if(err<0) return err; if (register_netdev(&dev_ltpc) != 0) { if(debug&DEBUG_VERBOSE) printk("EIO from register_netdev\n"); return -EIO; } else { if(debug&DEBUG_VERBOSE) printk("0 from register_netdev\n"); return 0; } } void cleanup_module(void) { long timeout; ltpc_timer.data = 0; /* signal the poll routine that we're done */ if(debug&DEBUG_VERBOSE) printk("freeing irq\n"); if(dev_ltpc.irq) { free_irq(dev_ltpc.irq,&dev_ltpc); dev_ltpc.irq = 0; } if(del_timer(<pc_timer)) { /* either the poll was never started, or a poll is in process */ if(debug&DEBUG_VERBOSE) printk("waiting\n"); /* if it's in process, wait a bit for it to finish */ timeout = jiffies+HZ; add_timer(<pc_timer); while(del_timer(<pc_timer) && (timeout > jiffies)) { add_timer(<pc_timer); schedule(); } } if(debug&DEBUG_VERBOSE) printk("freeing dma\n"); if(dev_ltpc.dma) { free_dma(dev_ltpc.dma); dev_ltpc.dma = 0; } if(debug&DEBUG_VERBOSE) printk("freeing ioaddr\n"); if(dev_ltpc.base_addr) { release_region(dev_ltpc.base_addr,8); dev_ltpc.base_addr = 0; } if(debug&DEBUG_VERBOSE) printk("free_pages\n"); free_pages( (unsigned long) ltdmabuf, __get_order(1000)); ltdmabuf=NULL; ltdmacbuf=NULL; if(debug&DEBUG_VERBOSE) printk("unregister_netdev\n"); unregister_netdev(&dev_ltpc); if(debug&DEBUG_VERBOSE) printk("returning from cleanup_module\n"); } #endif /* MODULE */