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 <linux/init.h>
  24 #include <net/arp.h>
  25
  26 #include <asm/io.h>
  27 #include <asm/dma.h>
  28 #include <asm/byteorder.h>
  29 #include <net/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 pppdev;
  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 - it's 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 don't have time to process
  67          *      it right now.
  68          */
  69         netif_rx(skb);
  70         c->netdevice->last_rx = jiffies;
  71 }
  72
  73 /*
  74  *      We've been placed in the UP state
  75  */
  76
  77 static int sealevel_open(struct net_device *d)
  78 {
  79         struct slvl_device *slvl=d->priv;
  80         int err = -1;
  81         int unit = slvl->channel;
  82
  83         /*
  84          *      Link layer up.
  85          */
  86
  87         switch(unit)
  88         {
  89                 case 0:
  90                         err=z8530_sync_dma_open(d, slvl->chan);
  91                         break;
  92                 case 1:
  93                         err=z8530_sync_open(d, slvl->chan);
  94                         break;
  95         }
  96
  97         if(err)
  98                 return err;
  99         /*
 100          *      Begin PPP
 101          */
 102         err=sppp_open(d);
 103         if(err)
 104         {
 105                 switch(unit)
 106                 {
 107                         case 0:
 108                                 z8530_sync_dma_close(d, slvl->chan);
 109                                 break;
 110                         case 1:
 111                                 z8530_sync_close(d, slvl->chan);
 112                                 break;
 113                 }
 114                 return err;
 115         }
 116
 117         slvl->chan->rx_function=sealevel_input;
 118
 119         /*
 120          *      Go go go
 121          */
 122         netif_start_queue(d);
 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         return 0;
 157 }
 158
 159 static int sealevel_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
 160 {
 161         /* struct slvl_device *slvl=d->priv;
 162            z8530_ioctl(d,&slvl->sync.chanA,ifr,cmd) */
 163         return sppp_do_ioctl(d, ifr,cmd);
 164 }
 165
 166 static struct net_device_stats *sealevel_get_stats(struct net_device *d)
 167 {
 168         struct slvl_device *slvl=d->priv;
 169         if(slvl)
 170                 return z8530_get_stats(slvl->chan);
 171         else
 172                 return NULL;
 173 }
 174
 175 /*
 176  *      Passed PPP frames, fire them downwind.
 177  */
 178
 179 static int sealevel_queue_xmit(struct sk_buff *skb, struct net_device *d)
 180 {
 181         struct slvl_device *slvl=d->priv;
 182         return z8530_queue_xmit(slvl->chan, skb);
 183 }
 184
 185 static int sealevel_neigh_setup(struct neighbour *n)
 186 {
 187         if (n->nud_state == NUD_NONE) {
 188                 n->ops = &arp_broken_ops;
 189                 n->output = n->ops->output;
 190         }
 191         return 0;
 192 }
 193
 194 static int sealevel_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p)
 195 {
 196         if (p->tbl->family == AF_INET) {
 197                 p->neigh_setup = sealevel_neigh_setup;
 198                 p->ucast_probes = 0;
 199                 p->mcast_probes = 0;
 200         }
 201         return 0;
 202 }
 203
 204 static int sealevel_attach(struct net_device *dev)
 205 {
 206         struct slvl_device *sv = dev->priv;
 207         sppp_attach(&sv->pppdev);
 208         return 0;
 209 }
 210
 211 static void sealevel_detach(struct net_device *dev)
 212 {
 213         sppp_detach(dev);
 214 }
 215
 216 static void slvl_setup(struct net_device *d)
 217 {
 218         d->open = sealevel_open;
 219         d->stop = sealevel_close;
 220         d->init = sealevel_attach;
 221         d->uninit = sealevel_detach;
 222         d->hard_start_xmit = sealevel_queue_xmit;
 223         d->get_stats = sealevel_get_stats;
 224         d->set_multicast_list = NULL;
 225         d->do_ioctl = sealevel_ioctl;
 226         d->neigh_setup = sealevel_neigh_setup_dev;
 227         d->set_mac_address = NULL;
 228
 229 }
 230
 231 static inline struct slvl_device *slvl_alloc(int iobase, int irq)
 232 {
 233         struct net_device *d;
 234         struct slvl_device *sv;
 235
 236         d = alloc_netdev(sizeof(struct slvl_device), "hdlc%d",
 237                          slvl_setup);
 238
 239         if (!d)
 240                 return NULL;
 241
 242         sv = d->priv;
 243         sv->if_ptr = &sv->pppdev;
 244         sv->pppdev.dev = d;
 245         d->base_addr = iobase;
 246         d->irq = irq;
 247
 248         return sv;
 249 }
 250
 251
 252 /*
 253  *      Allocate and setup Sealevel board.
 254  */
 255
 256 static __init struct slvl_board *slvl_init(int iobase, int irq,
 257                                            int txdma, int rxdma, int slow)
 258 {
 259         struct z8530_dev *dev;
 260         struct slvl_board *b;
 261
 262         /*
 263          *      Get the needed I/O space
 264          */
 265
 266         if(!request_region(iobase, 8, "Sealevel 4021"))
 267         {
 268                 printk(KERN_WARNING "sealevel: I/O 0x%X already in use.\n", iobase);
 269                 return NULL;
 270         }
 271
 272         b = kmalloc(sizeof(struct slvl_board), GFP_KERNEL);
 273         if(!b)
 274                 goto fail3;
 275
 276         memset(b, 0, sizeof(*b));
 277         if (!(b->dev[0]= slvl_alloc(iobase, irq)))
 278                 goto fail2;
 279
 280         b->dev[0]->chan = &b->board.chanA;
 281         b->dev[0]->channel = 0;
 282
 283         if (!(b->dev[1] = slvl_alloc(iobase, irq)))
 284                 goto fail1_0;
 285
 286         b->dev[1]->chan = &b->board.chanB;
 287         b->dev[1]->channel = 1;
 288
 289         dev = &b->board;
 290
 291         /*
 292          *      Stuff in the I/O addressing
 293          */
 294
 295         dev->active = 0;
 296
 297         b->iobase = iobase;
 298
 299         /*
 300          *      Select 8530 delays for the old board
 301          */
 302
 303         if(slow)
 304                 iobase |= Z8530_PORT_SLEEP;
 305
 306         dev->chanA.ctrlio=iobase+1;
 307         dev->chanA.dataio=iobase;
 308         dev->chanB.ctrlio=iobase+3;
 309         dev->chanB.dataio=iobase+2;
 310
 311         dev->chanA.irqs=&z8530_nop;
 312         dev->chanB.irqs=&z8530_nop;
 313
 314         /*
 315          *      Assert DTR enable DMA
 316          */
 317
 318         outb(3|(1<<7), b->iobase+4);
 319
 320
 321         /* We want a fast IRQ for this device. Actually we'd like an even faster
 322            IRQ ;) - This is one driver RtLinux is made for */
 323
 324         if(request_irq(irq, &z8530_interrupt, SA_INTERRUPT, "SeaLevel", dev)<0)
 325         {
 326                 printk(KERN_WARNING "sealevel: IRQ %d already in use.\n", irq);
 327                 goto fail1_1;
 328         }
 329
 330         dev->irq=irq;
 331         dev->chanA.private=&b->dev[0];
 332         dev->chanB.private=&b->dev[1];
 333         dev->chanA.netdevice=b->dev[0]->pppdev.dev;
 334         dev->chanB.netdevice=b->dev[1]->pppdev.dev;
 335         dev->chanA.dev=dev;
 336         dev->chanB.dev=dev;
 337
 338         dev->chanA.txdma=3;
 339         dev->chanA.rxdma=1;
 340         if(request_dma(dev->chanA.txdma, "SeaLevel (TX)")!=0)
 341                 goto fail;
 342
 343         if(request_dma(dev->chanA.rxdma, "SeaLevel (RX)")!=0)
 344                 goto dmafail;
 345
 346         disable_irq(irq);
 347
 348         /*
 349          *      Begin normal initialise
 350          */
 351
 352         if(z8530_init(dev)!=0)
 353         {
 354                 printk(KERN_ERR "Z8530 series device not found.\n");
 355                 enable_irq(irq);
 356                 goto dmafail2;
 357         }
 358         if(dev->type==Z85C30)
 359         {
 360                 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream);
 361                 z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream);
 362         }
 363         else
 364         {
 365                 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream_85230);
 366                 z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream_85230);
 367         }
 368
 369         /*
 370          *      Now we can take the IRQ
 371          */
 372
 373         enable_irq(irq);
 374
 375         if (register_netdev(b->dev[0]->pppdev.dev))
 376                 goto dmafail2;
 377
 378         if (register_netdev(b->dev[1]->pppdev.dev))
 379                 goto fail_unit;
 380
 381         z8530_describe(dev, "I/O", iobase);
 382         dev->active=1;
 383         return b;
 384
 385 fail_unit:
 386         unregister_netdev(b->dev[0]->pppdev.dev);
 387
 388 dmafail2:
 389         free_dma(dev->chanA.rxdma);
 390 dmafail:
 391         free_dma(dev->chanA.txdma);
 392 fail:
 393         free_irq(irq, dev);
 394 fail1_1:
 395         free_netdev(b->dev[1]->pppdev.dev);
 396 fail1_0:
 397         free_netdev(b->dev[0]->pppdev.dev);
 398 fail2:
 399         kfree(b);
 400 fail3:
 401         release_region(iobase,8);
 402         return NULL;
 403 }
 404
 405 static void __exit slvl_shutdown(struct slvl_board *b)
 406 {
 407         int u;
 408
 409         z8530_shutdown(&b->board);
 410
 411         for(u=0; u<2; u++)
 412         {
 413                 struct net_device *d = b->dev[u]->pppdev.dev;
 414                 unregister_netdev(d);
 415                 free_netdev(d);
 416         }
 417
 418         free_irq(b->board.irq, &b->board);
 419         free_dma(b->board.chanA.rxdma);
 420         free_dma(b->board.chanA.txdma);
 421         /* DMA off on the card, drop DTR */
 422         outb(0, b->iobase);
 423         release_region(b->iobase, 8);
 424         kfree(b);
 425 }
 426
 427
 428 static int io=0x238;
 429 static int txdma=1;
 430 static int rxdma=3;
 431 static int irq=5;
 432 static int slow=0;
 433
 434 module_param(io, int, 0);
 435 MODULE_PARM_DESC(io, "The I/O base of the Sealevel card");
 436 module_param(txdma, int, 0);
 437 MODULE_PARM_DESC(txdma, "Transmit DMA channel");
 438 module_param(rxdma, int, 0);
 439 MODULE_PARM_DESC(rxdma, "Receive DMA channel");
 440 module_param(irq, int, 0);
 441 MODULE_PARM_DESC(irq, "The interrupt line setting for the SeaLevel card");
 442 module_param(slow, bool, 0);
 443 MODULE_PARM_DESC(slow, "Set this for an older Sealevel card such as the 4012");
 444
 445 MODULE_AUTHOR("Alan Cox");
 446 MODULE_LICENSE("GPL");
 447 MODULE_DESCRIPTION("Modular driver for the SeaLevel 4021");
 448
 449 static struct slvl_board *slvl_unit;
 450
 451 static int __init slvl_init_module(void)
 452 {
 453 #ifdef MODULE
 454         printk(KERN_INFO "SeaLevel Z85230 Synchronous Driver v 0.02.\n");
 455         printk(KERN_INFO "(c) Copyright 1998, Building Number Three Ltd.\n");
 456 #endif
 457         slvl_unit = slvl_init(io, irq, txdma, rxdma, slow);
 458
 459         return slvl_unit ? 0 : -ENODEV;
 460 }
 461
 462 static void __exit slvl_cleanup_module(void)
 463 {
 464         if(slvl_unit)
 465                 slvl_shutdown(slvl_unit);
 466 }
 467
 468 module_init(slvl_init_module);
 469 module_exit(slvl_cleanup_module);