drivers/net/wan/sealevel.c

   1 #define LINUX_21
   2
   3 /*
   4  *      Sealevel Systems 4021 driver.
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License
   8  *      as published by the Free Software Foundation; either version
   9  *      2 of the License, or (at your option) any later version.
  10  *
  11  *      (c) Copyright 1999 Building Number Three Ltd
  12  *
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17 #include <linux/mm.h>
  18 #include <linux/net.h>
  19 #include <linux/skbuff.h>
  20 #include <linux/netdevice.h>
  21 #include <linux/if_arp.h>
  22 #include <linux/delay.h>
  23 #include <linux/ioport.h>
  24 #include <net/arp.h>
  25
  26 #include <asm/io.h>
  27 #include <asm/dma.h>
  28 #include <asm/byteorder.h>
  29 #include "syncppp.h"
  30 #include "z85230.h"
  31
  32
  33 struct slvl_device
  34 {
  35         void *if_ptr;   /* General purpose pointer (used by SPPP) */
  36         struct z8530_channel *chan;
  37         struct ppp_device netdev;
  38         int channel;
  39 };
  40
  41
  42 struct slvl_board
  43 {
  44         struct slvl_device dev[2];
  45         struct z8530_dev board;
  46         int iobase;
  47 };
  48
  49 /*
  50  *      Network driver support routines
  51  */
  52
  53 /*
  54  *      Frame receive. Simple for our card as we do sync ppp and there
  55  *      is no funny garbage involved
  56  */
  57
  58 static void sealevel_input(struct z8530_channel *c, struct sk_buff *skb)
  59 {
  60         /* Drop the CRC - its not a good idea to try and negotiate it ;) */
  61         skb_trim(skb, skb->len-2);
  62         skb->protocol=htons(ETH_P_WAN_PPP);
  63         skb->mac.raw=skb->data;
  64         skb->dev=c->netdevice;
  65         /*
  66          *      Send it to the PPP layer. We dont have time to process
  67          *      it right now.
  68          */
  69         netif_rx(skb);
  70 }
  71
  72 /*
  73  *      We've been placed in the UP state
  74  */
  75
  76 static int sealevel_open(struct net_device *d)
  77 {
  78         struct slvl_device *slvl=d->priv;
  79         int err = -1;
  80         int unit = slvl->channel;
  81
  82         /*
  83          *      Link layer up.
  84          */
  85
  86         switch(unit)
  87         {
  88                 case 0:
  89                         err=z8530_sync_dma_open(d, slvl->chan);
  90                         break;
  91                 case 1:
  92                         err=z8530_sync_open(d, slvl->chan);
  93                         break;
  94         }
  95
  96         if(err)
  97                 return err;
  98         /*
  99          *      Begin PPP
 100          */
 101         err=sppp_open(d);
 102         if(err)
 103         {
 104                 switch(unit)
 105                 {
 106                         case 0:
 107                                 z8530_sync_dma_close(d, slvl->chan);
 108                                 break;
 109                         case 1:
 110                                 z8530_sync_close(d, slvl->chan);
 111                                 break;
 112                 }
 113                 return err;
 114         }
 115
 116         slvl->chan->rx_function=sealevel_input;
 117
 118         /*
 119          *      Go go go
 120          */
 121         netif_start_queue(d);
 122         MOD_INC_USE_COUNT;
 123         return 0;
 124 }
 125
 126 static int sealevel_close(struct net_device *d)
 127 {
 128         struct slvl_device *slvl=d->priv;
 129         int unit = slvl->channel;
 130
 131         /*
 132          *      Discard new frames
 133          */
 134
 135         slvl->chan->rx_function=z8530_null_rx;
 136
 137         /*
 138          *      PPP off
 139          */
 140         sppp_close(d);
 141         /*
 142          *      Link layer down
 143          */
 144
 145         netif_stop_queue(d);
 146
 147         switch(unit)
 148         {
 149                 case 0:
 150                         z8530_sync_dma_close(d, slvl->chan);
 151                         break;
 152                 case 1:
 153                         z8530_sync_close(d, slvl->chan);
 154                         break;
 155         }
 156         MOD_DEC_USE_COUNT;
 157         return 0;
 158 }
 159
 160 static int sealevel_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
 161 {
 162         /* struct slvl_device *slvl=d->priv;
 163            z8530_ioctl(d,&slvl->sync.chanA,ifr,cmd) */
 164         return sppp_do_ioctl(d, ifr,cmd);
 165 }
 166
 167 static struct net_device_stats *sealevel_get_stats(struct net_device *d)
 168 {
 169         struct slvl_device *slvl=d->priv;
 170         if(slvl)
 171                 return z8530_get_stats(slvl->chan);
 172         else
 173                 return NULL;
 174 }
 175
 176 /*
 177  *      Passed PPP frames, fire them downwind.
 178  */
 179
 180 static int sealevel_queue_xmit(struct sk_buff *skb, struct net_device *d)
 181 {
 182         struct slvl_device *slvl=d->priv;
 183         return z8530_queue_xmit(slvl->chan, skb);
 184 }
 185
 186 #ifdef LINUX_21
 187 static int sealevel_neigh_setup(struct neighbour *n)
 188 {
 189         if (n->nud_state == NUD_NONE) {
 190                 n->ops = &arp_broken_ops;
 191                 n->output = n->ops->output;
 192         }
 193         return 0;
 194 }
 195
 196 static int sealevel_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p)
 197 {
 198         if (p->tbl->family == AF_INET) {
 199                 p->neigh_setup = sealevel_neigh_setup;
 200                 p->ucast_probes = 0;
 201                 p->mcast_probes = 0;
 202         }
 203         return 0;
 204 }
 205
 206 #else
 207
 208 static int return_0(struct net_device *d)
 209 {
 210         return 0;
 211 }
 212
 213 #endif
 214
 215 /*
 216  *      Description block for a Comtrol Hostess SV11 card
 217  */
 218
 219 static struct slvl_board *slvl_init(int iobase, int irq, int txdma, int rxdma, int slow)
 220 {
 221         struct z8530_dev *dev;
 222         struct slvl_device *sv;
 223         struct slvl_board *b;
 224
 225         unsigned long flags;
 226         int u;
 227
 228         /*
 229          *      Get the needed I/O space
 230          */
 231
 232         if(check_region(iobase, 8))
 233         {
 234                 printk(KERN_WARNING "sealevel: I/O 0x%X already in use.\n", iobase);
 235                 return NULL;
 236         }
 237         request_region(iobase, 8, "Sealevel 4021");
 238
 239         b=(struct slvl_board *)kmalloc(sizeof(struct slvl_board), GFP_KERNEL);
 240         if(!b)
 241                 goto fail3;
 242
 243         memset(b, 0, sizeof(*sv));
 244
 245         b->dev[0].chan = &b->board.chanA;
 246         b->dev[0].if_ptr = &b->dev[0].netdev;
 247         b->dev[0].netdev.dev=(struct net_device *)
 248                 kmalloc(sizeof(struct net_device), GFP_KERNEL);
 249         if(!b->dev[0].netdev.dev)
 250                 goto fail2;
 251
 252         b->dev[1].chan = &b->board.chanB;
 253         b->dev[1].if_ptr = &b->dev[1].netdev;
 254         b->dev[1].netdev.dev=(struct net_device *)
 255                 kmalloc(sizeof(struct net_device), GFP_KERNEL);
 256         if(!b->dev[1].netdev.dev)
 257                 goto fail1_0;
 258
 259         dev=&b->board;
 260
 261         /*
 262          *      Stuff in the I/O addressing
 263          */
 264
 265         dev->active = 0;
 266
 267         b->iobase = iobase;
 268
 269         /*
 270          *      Select 8530 delays for the old board
 271          */
 272
 273         if(slow)
 274                 iobase |= Z8530_PORT_SLEEP;
 275
 276         dev->chanA.ctrlio=iobase+1;
 277         dev->chanA.dataio=iobase;
 278         dev->chanB.ctrlio=iobase+3;
 279         dev->chanB.dataio=iobase+2;
 280
 281         dev->chanA.irqs=&z8530_nop;
 282         dev->chanB.irqs=&z8530_nop;
 283
 284         /*
 285          *      Assert DTR enable DMA
 286          */
 287
 288         outb(3|(1<<7), b->iobase+4);
 289
 290
 291         /* We want a fast IRQ for this device. Actually we'd like an even faster
 292            IRQ ;) - This is one driver RtLinux is made for */
 293
 294         if(request_irq(irq, &z8530_interrupt, SA_INTERRUPT, "SeaLevel", dev)<0)
 295         {
 296                 printk(KERN_WARNING "sealevel: IRQ %d already in use.\n", irq);
 297                 goto fail1_1;
 298         }
 299
 300         dev->irq=irq;
 301         dev->chanA.private=&b->dev[0];
 302         dev->chanB.private=&b->dev[1];
 303         dev->chanA.netdevice=b->dev[0].netdev.dev;
 304         dev->chanB.netdevice=b->dev[1].netdev.dev;
 305         dev->chanA.dev=dev;
 306         dev->chanB.dev=dev;
 307
 308         dev->chanA.txdma=3;
 309         dev->chanA.rxdma=1;
 310         if(request_dma(dev->chanA.txdma, "SeaLevel (TX)")!=0)
 311                 goto fail;
 312
 313         if(request_dma(dev->chanA.rxdma, "SeaLevel (RX)")!=0)
 314                 goto dmafail;
 315
 316         save_flags(flags);
 317         cli();
 318
 319         /*
 320          *      Begin normal initialise
 321          */
 322
 323         if(z8530_init(dev)!=0)
 324         {
 325                 printk(KERN_ERR "Z8530 series device not found.\n");
 326                 restore_flags(flags);
 327                 goto dmafail2;
 328         }
 329         if(dev->type==Z85C30)
 330         {
 331                 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream);
 332                 z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream);
 333         }
 334         else
 335         {
 336                 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream_85230);
 337                 z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream_85230);
 338         }
 339
 340         /*
 341          *      Now we can take the IRQ
 342          */
 343
 344         restore_flags(flags);
 345
 346         for(u=0; u<2; u++)
 347         {
 348                 sv=&b->dev[u];
 349                 sv->channel = u;
 350
 351                 if(dev_alloc_name(sv->chan->netdevice,"hdlc%d")>=0)
 352                 {
 353                         struct net_device *d=sv->chan->netdevice;
 354
 355                         /*
 356                          *      Initialise the PPP components
 357                          */
 358                         sppp_attach(&sv->netdev);
 359
 360                         /*
 361                          *      Local fields
 362                          */
 363
 364                         d->base_addr = iobase;
 365                         d->irq = irq;
 366                         d->priv = sv;
 367                         d->init = NULL;
 368
 369                         d->open = sealevel_open;
 370                         d->stop = sealevel_close;
 371                         d->hard_start_xmit = sealevel_queue_xmit;
 372                         d->get_stats = sealevel_get_stats;
 373                         d->set_multicast_list = NULL;
 374                         d->do_ioctl = sealevel_ioctl;
 375 #ifdef LINUX_21
 376                         d->neigh_setup = sealevel_neigh_setup_dev;
 377                         dev_init_buffers(d);
 378 #else
 379                         d->init = return_0;
 380 #endif
 381                         d->set_mac_address = NULL;
 382
 383                         if(register_netdev(d)==-1)
 384                         {
 385                                 printk(KERN_ERR "%s: unable to register device.\n",
 386                                         d->name);
 387                                 goto fail_unit;
 388                         }
 389
 390                         break;
 391                 }
 392         }
 393         z8530_describe(dev, "I/O", iobase);
 394         dev->active=1;
 395         return b;
 396
 397 fail_unit:
 398         if(u==1)
 399                 unregister_netdev(b->dev[0].chan->netdevice);
 400
 401 dmafail2:
 402         free_dma(dev->chanA.rxdma);
 403 dmafail:
 404         free_dma(dev->chanA.txdma);
 405 fail:
 406         free_irq(irq, dev);
 407 fail1_1:
 408         kfree(b->dev[1].netdev.dev);
 409 fail1_0:
 410         kfree(b->dev[0].netdev.dev);
 411 fail2:
 412         kfree(b);
 413 fail3:
 414         release_region(iobase,8);
 415         return NULL;
 416 }
 417
 418 static void slvl_shutdown(struct slvl_board *b)
 419 {
 420         int u;
 421
 422         z8530_shutdown(&b->board);
 423
 424         for(u=0; u<2; u++)
 425         {
 426                 sppp_detach(b->dev[u].netdev.dev);
 427                 unregister_netdev(b->dev[u].netdev.dev);
 428         }
 429
 430         free_irq(b->board.irq, &b->board);
 431         free_dma(b->board.chanA.rxdma);
 432         free_dma(b->board.chanA.txdma);
 433         /* DMA off on the card, drop DTR */
 434         outb(0, b->iobase);
 435         release_region(b->iobase, 8);
 436 }
 437
 438 #ifdef MODULE
 439
 440 static int io=0x238;
 441 static int txdma=1;
 442 static int rxdma=3;
 443 static int irq=5;
 444 static int slow=0;
 445
 446 #ifdef LINUX_21
 447 MODULE_PARM(io,"i");
 448 MODULE_PARM_DESC(io, "The I/O base of the Sealevel card");
 449 MODULE_PARM(txdma,"i");
 450 MODULE_PARM_DESC(txdma, "Transmit DMA channel");
 451 MODULE_PARM(rxdma,"i");
 452 MODULE_PARM_DESC(rxdma, "Receive DMA channel");
 453 MODULE_PARM(irq,"i");
 454 MODULE_PARM_DESC(irq, "The interrupt line setting for the SeaLevel card");
 455 MODULE_PARM(slow,"i");
 456 MODULE_PARM_DESC(slow, "Set this for an older Sealevel card such as the 4012");
 457
 458 MODULE_AUTHOR("Bulding Number Three Ltd");
 459 MODULE_DESCRIPTION("Modular driver for the SeaLevel 4021");
 460 #endif
 461
 462 static struct slvl_board *slvl_unit;
 463
 464 int init_module(void)
 465 {
 466         printk(KERN_INFO "SeaLevel Z85230 Synchronous Driver v 0.01.\n");
 467         printk(KERN_INFO "(c) Copyright 1998, Building Number Three Ltd.\n");
 468         if((slvl_unit=slvl_init(io,irq, txdma, rxdma, slow))==NULL)
 469                 return -ENODEV;
 470         return 0;
 471 }
 472
 473 void cleanup_module(void)
 474 {
 475         if(slvl_unit)
 476                 slvl_shutdown(slvl_unit);
 477 }
 478
 479 #endif
 480