drivers/net/wan/sealevel.c

   1 /*
   2  *      Sealevel Systems 4021 driver.
   3  *
   4  *      This program is free software; you can redistribute it and/or
   5  *      modify it under the terms of the GNU General Public License
   6  *      as published by the Free Software Foundation; either version
   7  *      2 of the License, or (at your option) any later version.
   8  *
   9  *      (c) Copyright 1999, 2001 Alan Cox
  10  *      (c) Copyright 2001 Red Hat Inc.
  11  *
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/mm.h>
  17 #include <linux/net.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/netdevice.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/delay.h>
  22 #include <linux/ioport.h>
  23 #include <net/arp.h>
  24
  25 #include <asm/io.h>
  26 #include <asm/dma.h>
  27 #include <asm/byteorder.h>
  28 #include <net/syncppp.h>
  29 #include "z85230.h"
  30
  31
  32 struct slvl_device
  33 {
  34         void *if_ptr;   /* General purpose pointer (used by SPPP) */
  35         struct z8530_channel *chan;
  36         struct ppp_device pppdev;
  37         int channel;
  38 };
  39
  40
  41 struct slvl_board
  42 {
  43         struct slvl_device *dev[2];
  44         struct z8530_dev board;
  45         int iobase;
  46 };
  47
  48 /*
  49  *      Network driver support routines
  50  */
  51
  52 /*
  53  *      Frame receive. Simple for our card as we do sync ppp and there
  54  *      is no funny garbage involved
  55  */
  56
  57 static void sealevel_input(struct z8530_channel *c, struct sk_buff *skb)
  58 {
  59         /* Drop the CRC - it's not a good idea to try and negotiate it ;) */
  60         skb_trim(skb, skb->len-2);
  61         skb->protocol=htons(ETH_P_WAN_PPP);
  62         skb->mac.raw=skb->data;
  63         skb->dev=c->netdevice;
  64         /*
  65          *      Send it to the PPP layer. We don't have time to process
  66          *      it right now.
  67          */
  68         netif_rx(skb);
  69         c->netdevice->last_rx = jiffies;
  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         return 0;
 123 }
 124
 125 static int sealevel_close(struct net_device *d)
 126 {
 127         struct slvl_device *slvl=d->priv;
 128         int unit = slvl->channel;
 129
 130         /*
 131          *      Discard new frames
 132          */
 133
 134         slvl->chan->rx_function=z8530_null_rx;
 135
 136         /*
 137          *      PPP off
 138          */
 139         sppp_close(d);
 140         /*
 141          *      Link layer down
 142          */
 143
 144         netif_stop_queue(d);
 145
 146         switch(unit)
 147         {
 148                 case 0:
 149                         z8530_sync_dma_close(d, slvl->chan);
 150                         break;
 151                 case 1:
 152                         z8530_sync_close(d, slvl->chan);
 153                         break;
 154         }
 155         return 0;
 156 }
 157
 158 static int sealevel_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
 159 {
 160         /* struct slvl_device *slvl=d->priv;
 161            z8530_ioctl(d,&slvl->sync.chanA,ifr,cmd) */
 162         return sppp_do_ioctl(d, ifr,cmd);
 163 }
 164
 165 static struct net_device_stats *sealevel_get_stats(struct net_device *d)
 166 {
 167         struct slvl_device *slvl=d->priv;
 168         if(slvl)
 169                 return z8530_get_stats(slvl->chan);
 170         else
 171                 return NULL;
 172 }
 173
 174 /*
 175  *      Passed PPP frames, fire them downwind.
 176  */
 177
 178 static int sealevel_queue_xmit(struct sk_buff *skb, struct net_device *d)
 179 {
 180         struct slvl_device *slvl=d->priv;
 181         return z8530_queue_xmit(slvl->chan, skb);
 182 }
 183
 184 static int sealevel_neigh_setup(struct neighbour *n)
 185 {
 186         if (n->nud_state == NUD_NONE) {
 187                 n->ops = &arp_broken_ops;
 188                 n->output = n->ops->output;
 189         }
 190         return 0;
 191 }
 192
 193 static int sealevel_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p)
 194 {
 195         if (p->tbl->family == AF_INET) {
 196                 p->neigh_setup = sealevel_neigh_setup;
 197                 p->ucast_probes = 0;
 198                 p->mcast_probes = 0;
 199         }
 200         return 0;
 201 }
 202
 203 static int sealevel_attach(struct net_device *dev)
 204 {
 205         struct slvl_device *sv = dev->priv;
 206         sppp_attach(&sv->pppdev);
 207         return 0;
 208 }
 209
 210 static void sealevel_detach(struct net_device *dev)
 211 {
 212         sppp_detach(dev);
 213 }
 214
 215 static void slvl_setup(struct net_device *d)
 216 {
 217         d->open = sealevel_open;
 218         d->stop = sealevel_close;
 219         d->init = sealevel_attach;
 220         d->uninit = sealevel_detach;
 221         d->hard_start_xmit = sealevel_queue_xmit;
 222         d->get_stats = sealevel_get_stats;
 223         d->set_multicast_list = NULL;
 224         d->do_ioctl = sealevel_ioctl;
 225         d->neigh_setup = sealevel_neigh_setup_dev;
 226         d->set_mac_address = NULL;
 227
 228 }
 229
 230 static inline struct slvl_device *slvl_alloc(int iobase, int irq)
 231 {
 232         struct net_device *d;
 233         struct slvl_device *sv;
 234
 235         d = alloc_netdev(sizeof(struct slvl_device), "hdlc%d",
 236                          slvl_setup);
 237
 238         if (!d)
 239                 return NULL;
 240
 241         sv = d->priv;
 242         sv->if_ptr = &sv->pppdev;
 243         sv->pppdev.dev = d;
 244         d->base_addr = iobase;
 245         d->irq = irq;
 246
 247         return sv;
 248 }
 249
 250
 251 /*
 252  *      Allocate and setup Sealevel board.
 253  */
 254
 255 static __init struct slvl_board *slvl_init(int iobase, int irq,
 256                                            int txdma, int rxdma, int slow)
 257 {
 258         struct z8530_dev *dev;
 259         struct slvl_board *b;
 260
 261         /*
 262          *      Get the needed I/O space
 263          */
 264
 265         if(!request_region(iobase, 8, "Sealevel 4021"))
 266         {
 267                 printk(KERN_WARNING "sealevel: I/O 0x%X already in use.\n", iobase);
 268                 return NULL;
 269         }
 270
 271         b = kmalloc(sizeof(struct slvl_board), GFP_KERNEL);
 272         if(!b)
 273                 goto fail3;
 274
 275         memset(b, 0, sizeof(*b));
 276         if (!(b->dev[0]= slvl_alloc(iobase, irq)))
 277                 goto fail2;
 278
 279         b->dev[0]->chan = &b->board.chanA;
 280         b->dev[0]->channel = 0;
 281
 282         if (!(b->dev[1] = slvl_alloc(iobase, irq)))
 283                 goto fail1_0;
 284
 285         b->dev[1]->chan = &b->board.chanB;
 286         b->dev[1]->channel = 1;
 287
 288         dev = &b->board;
 289
 290         /*
 291          *      Stuff in the I/O addressing
 292          */
 293
 294         dev->active = 0;
 295
 296         b->iobase = iobase;
 297
 298         /*
 299          *      Select 8530 delays for the old board
 300          */
 301
 302         if(slow)
 303                 iobase |= Z8530_PORT_SLEEP;
 304
 305         dev->chanA.ctrlio=iobase+1;
 306         dev->chanA.dataio=iobase;
 307         dev->chanB.ctrlio=iobase+3;
 308         dev->chanB.dataio=iobase+2;
 309
 310         dev->chanA.irqs=&z8530_nop;
 311         dev->chanB.irqs=&z8530_nop;
 312
 313         /*
 314          *      Assert DTR enable DMA
 315          */
 316
 317         outb(3|(1<<7), b->iobase+4);
 318
 319
 320         /* We want a fast IRQ for this device. Actually we'd like an even faster
 321            IRQ ;) - This is one driver RtLinux is made for */
 322
 323         if(request_irq(irq, &z8530_interrupt, SA_INTERRUPT, "SeaLevel", dev)<0)
 324         {
 325                 printk(KERN_WARNING "sealevel: IRQ %d already in use.\n", irq);
 326                 goto fail1_1;
 327         }
 328
 329         dev->irq=irq;
 330         dev->chanA.private=&b->dev[0];
 331         dev->chanB.private=&b->dev[1];
 332         dev->chanA.netdevice=b->dev[0]->pppdev.dev;
 333         dev->chanB.netdevice=b->dev[1]->pppdev.dev;
 334         dev->chanA.dev=dev;
 335         dev->chanB.dev=dev;
 336
 337         dev->chanA.txdma=3;
 338         dev->chanA.rxdma=1;
 339         if(request_dma(dev->chanA.txdma, "SeaLevel (TX)")!=0)
 340                 goto fail;
 341
 342         if(request_dma(dev->chanA.rxdma, "SeaLevel (RX)")!=0)
 343                 goto dmafail;
 344
 345         disable_irq(irq);
 346
 347         /*
 348          *      Begin normal initialise
 349          */
 350
 351         if(z8530_init(dev)!=0)
 352         {
 353                 printk(KERN_ERR "Z8530 series device not found.\n");
 354                 enable_irq(irq);
 355                 goto dmafail2;
 356         }
 357         if(dev->type==Z85C30)
 358         {
 359                 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream);
 360                 z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream);
 361         }
 362         else
 363         {
 364                 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream_85230);
 365                 z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream_85230);
 366         }
 367
 368         /*
 369          *      Now we can take the IRQ
 370          */
 371
 372         enable_irq(irq);
 373
 374         if (register_netdev(b->dev[0]->pppdev.dev))
 375                 goto dmafail2;
 376
 377         if (register_netdev(b->dev[1]->pppdev.dev))
 378                 goto fail_unit;
 379
 380         z8530_describe(dev, "I/O", iobase);
 381         dev->active=1;
 382         return b;
 383
 384 fail_unit:
 385         unregister_netdev(b->dev[0]->pppdev.dev);
 386
 387 dmafail2:
 388         free_dma(dev->chanA.rxdma);
 389 dmafail:
 390         free_dma(dev->chanA.txdma);
 391 fail:
 392         free_irq(irq, dev);
 393 fail1_1:
 394         free_netdev(b->dev[1]->pppdev.dev);
 395 fail1_0:
 396         free_netdev(b->dev[0]->pppdev.dev);
 397 fail2:
 398         kfree(b);
 399 fail3:
 400         release_region(iobase,8);
 401         return NULL;
 402 }
 403
 404 static void __exit slvl_shutdown(struct slvl_board *b)
 405 {
 406         int u;
 407
 408         z8530_shutdown(&b->board);
 409
 410         for(u=0; u<2; u++)
 411         {
 412                 struct net_device *d = b->dev[u]->pppdev.dev;
 413                 unregister_netdev(d);
 414                 free_netdev(d);
 415         }
 416
 417         free_irq(b->board.irq, &b->board);
 418         free_dma(b->board.chanA.rxdma);
 419         free_dma(b->board.chanA.txdma);
 420         /* DMA off on the card, drop DTR */
 421         outb(0, b->iobase);
 422         release_region(b->iobase, 8);
 423         kfree(b);
 424 }
 425
 426
 427 static int io=0x238;
 428 static int txdma=1;
 429 static int rxdma=3;
 430 static int irq=5;
 431 static int slow=0;
 432
 433 MODULE_PARM(io,"i");
 434 MODULE_PARM_DESC(io, "The I/O base of the Sealevel card");
 435 MODULE_PARM(txdma,"i");
 436 MODULE_PARM_DESC(txdma, "Transmit DMA channel");
 437 MODULE_PARM(rxdma,"i");
 438 MODULE_PARM_DESC(rxdma, "Receive DMA channel");
 439 MODULE_PARM(irq,"i");
 440 MODULE_PARM_DESC(irq, "The interrupt line setting for the SeaLevel card");
 441 MODULE_PARM(slow,"i");
 442 MODULE_PARM_DESC(slow, "Set this for an older Sealevel card such as the 4012");
 443
 444 MODULE_AUTHOR("Alan Cox");
 445 MODULE_LICENSE("GPL");
 446 MODULE_DESCRIPTION("Modular driver for the SeaLevel 4021");
 447
 448 static struct slvl_board *slvl_unit;
 449
 450 static int __init slvl_init_module(void)
 451 {
 452 #ifdef MODULE
 453         printk(KERN_INFO "SeaLevel Z85230 Synchronous Driver v 0.02.\n");
 454         printk(KERN_INFO "(c) Copyright 1998, Building Number Three Ltd.\n");
 455 #endif
 456         slvl_unit = slvl_init(io, irq, txdma, rxdma, slow);
 457
 458         return slvl_unit ? 0 : -ENODEV;
 459 }
 460
 461 static void __exit slvl_cleanup_module(void)
 462 {
 463         if(slvl_unit)
 464                 slvl_shutdown(slvl_unit);
 465 }
 466
 467 module_init(slvl_init_module);
 468 module_exit(slvl_cleanup_module);