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  *      Generic HDLC port Copyright (C) 2008 Krzysztof Halasa <khc@pm.waw.pl>
  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/hdlc.h>
  24 #include <linux/ioport.h>
  25 #include <linux/init.h>
  26 #include <net/arp.h>
  27
  28 #include <asm/irq.h>
  29 #include <asm/io.h>
  30 #include <asm/dma.h>
  31 #include <asm/byteorder.h>
  32 #include "z85230.h"
  33
  34
  35 struct slvl_device
  36 {
  37         struct z8530_channel *chan;
  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 static inline struct slvl_device* dev_to_chan(struct net_device *dev)
  54 {
  55         return (struct slvl_device *)dev_to_hdlc(dev)->priv;
  56 }
  57
  58 /*
  59  *      Frame receive. Simple for our card as we do HDLC and there
  60  *      is no funny garbage involved
  61  */
  62
  63 static void sealevel_input(struct z8530_channel *c, struct sk_buff *skb)
  64 {
  65         /* Drop the CRC - it's not a good idea to try and negotiate it ;) */
  66         skb_trim(skb, skb->len - 2);
  67         skb->protocol = hdlc_type_trans(skb, c->netdevice);
  68         skb_reset_mac_header(skb);
  69         skb->dev = c->netdevice;
  70         netif_rx(skb);
  71         c->netdevice->last_rx = jiffies;
  72 }
  73
  74 /*
  75  *      We've been placed in the UP state
  76  */
  77
  78 static int sealevel_open(struct net_device *d)
  79 {
  80         struct slvl_device *slvl = dev_to_chan(d);
  81         int err = -1;
  82         int unit = slvl->channel;
  83
  84         /*
  85          *      Link layer up.
  86          */
  87
  88         switch (unit)
  89         {
  90                 case 0:
  91                         err = z8530_sync_dma_open(d, slvl->chan);
  92                         break;
  93                 case 1:
  94                         err = z8530_sync_open(d, slvl->chan);
  95                         break;
  96         }
  97
  98         if (err)
  99                 return err;
 100
 101         err = hdlc_open(d);
 102         if (err) {
 103                 switch (unit) {
 104                         case 0:
 105                                 z8530_sync_dma_close(d, slvl->chan);
 106                                 break;
 107                         case 1:
 108                                 z8530_sync_close(d, slvl->chan);
 109                                 break;
 110                 }
 111                 return err;
 112         }
 113
 114         slvl->chan->rx_function = sealevel_input;
 115
 116         /*
 117          *      Go go go
 118          */
 119         netif_start_queue(d);
 120         return 0;
 121 }
 122
 123 static int sealevel_close(struct net_device *d)
 124 {
 125         struct slvl_device *slvl = dev_to_chan(d);
 126         int unit = slvl->channel;
 127
 128         /*
 129          *      Discard new frames
 130          */
 131
 132         slvl->chan->rx_function = z8530_null_rx;
 133
 134         hdlc_close(d);
 135         netif_stop_queue(d);
 136
 137         switch (unit)
 138         {
 139                 case 0:
 140                         z8530_sync_dma_close(d, slvl->chan);
 141                         break;
 142                 case 1:
 143                         z8530_sync_close(d, slvl->chan);
 144                         break;
 145         }
 146         return 0;
 147 }
 148
 149 static int sealevel_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
 150 {
 151         /* struct slvl_device *slvl=dev_to_chan(d);
 152            z8530_ioctl(d,&slvl->sync.chanA,ifr,cmd) */
 153         return hdlc_ioctl(d, ifr, cmd);
 154 }
 155
 156 /*
 157  *      Passed network frames, fire them downwind.
 158  */
 159
 160 static int sealevel_queue_xmit(struct sk_buff *skb, struct net_device *d)
 161 {
 162         return z8530_queue_xmit(dev_to_chan(d)->chan, skb);
 163 }
 164
 165 static int sealevel_attach(struct net_device *dev, unsigned short encoding,
 166                            unsigned short parity)
 167 {
 168         if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT)
 169                 return 0;
 170         return -EINVAL;
 171 }
 172
 173 static int slvl_setup(struct slvl_device *sv, int iobase, int irq)
 174 {
 175         struct net_device *dev = alloc_hdlcdev(sv);
 176         if (!dev)
 177                 return -1;
 178
 179         dev_to_hdlc(dev)->attach = sealevel_attach;
 180         dev_to_hdlc(dev)->xmit = sealevel_queue_xmit;
 181         dev->open = sealevel_open;
 182         dev->stop = sealevel_close;
 183         dev->do_ioctl = sealevel_ioctl;
 184         dev->base_addr = iobase;
 185         dev->irq = irq;
 186
 187         if (register_hdlc_device(dev)) {
 188                 printk(KERN_ERR "sealevel: unable to register HDLC device\n");
 189                 free_netdev(dev);
 190                 return -1;
 191         }
 192
 193         sv->chan->netdevice = dev;
 194         return 0;
 195 }
 196
 197
 198 /*
 199  *      Allocate and setup Sealevel board.
 200  */
 201
 202 static __init struct slvl_board *slvl_init(int iobase, int irq,
 203                                            int txdma, int rxdma, int slow)
 204 {
 205         struct z8530_dev *dev;
 206         struct slvl_board *b;
 207
 208         /*
 209          *      Get the needed I/O space
 210          */
 211
 212         if (!request_region(iobase, 8, "Sealevel 4021")) {
 213                 printk(KERN_WARNING "sealevel: I/O 0x%X already in use.\n",
 214                        iobase);
 215                 return NULL;
 216         }
 217
 218         b = kzalloc(sizeof(struct slvl_board), GFP_KERNEL);
 219         if (!b)
 220                 goto err_kzalloc;
 221
 222         b->dev[0].chan = &b->board.chanA;
 223         b->dev[0].channel = 0;
 224
 225         b->dev[1].chan = &b->board.chanB;
 226         b->dev[1].channel = 1;
 227
 228         dev = &b->board;
 229
 230         /*
 231          *      Stuff in the I/O addressing
 232          */
 233
 234         dev->active = 0;
 235
 236         b->iobase = iobase;
 237
 238         /*
 239          *      Select 8530 delays for the old board
 240          */
 241
 242         if (slow)
 243                 iobase |= Z8530_PORT_SLEEP;
 244
 245         dev->chanA.ctrlio = iobase + 1;
 246         dev->chanA.dataio = iobase;
 247         dev->chanB.ctrlio = iobase + 3;
 248         dev->chanB.dataio = iobase + 2;
 249
 250         dev->chanA.irqs = &z8530_nop;
 251         dev->chanB.irqs = &z8530_nop;
 252
 253         /*
 254          *      Assert DTR enable DMA
 255          */
 256
 257         outb(3 | (1 << 7), b->iobase + 4);
 258
 259
 260         /* We want a fast IRQ for this device. Actually we'd like an even faster
 261            IRQ ;) - This is one driver RtLinux is made for */
 262
 263         if (request_irq(irq, &z8530_interrupt, IRQF_DISABLED,
 264                         "SeaLevel", dev) < 0) {
 265                 printk(KERN_WARNING "sealevel: IRQ %d already in use.\n", irq);
 266                 goto err_request_irq;
 267         }
 268
 269         dev->irq = irq;
 270         dev->chanA.private = &b->dev[0];
 271         dev->chanB.private = &b->dev[1];
 272         dev->chanA.dev = dev;
 273         dev->chanB.dev = dev;
 274
 275         dev->chanA.txdma = 3;
 276         dev->chanA.rxdma = 1;
 277         if (request_dma(dev->chanA.txdma, "SeaLevel (TX)"))
 278                 goto err_dma_tx;
 279
 280         if (request_dma(dev->chanA.rxdma, "SeaLevel (RX)"))
 281                 goto err_dma_rx;
 282
 283         disable_irq(irq);
 284
 285         /*
 286          *      Begin normal initialise
 287          */
 288
 289         if (z8530_init(dev) != 0) {
 290                 printk(KERN_ERR "Z8530 series device not found.\n");
 291                 enable_irq(irq);
 292                 goto free_hw;
 293         }
 294         if (dev->type == Z85C30) {
 295                 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream);
 296                 z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream);
 297         } else {
 298                 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream_85230);
 299                 z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream_85230);
 300         }
 301
 302         /*
 303          *      Now we can take the IRQ
 304          */
 305
 306         enable_irq(irq);
 307
 308         if (slvl_setup(&b->dev[0], iobase, irq))
 309                 goto free_hw;
 310         if (slvl_setup(&b->dev[1], iobase, irq))
 311                 goto free_netdev0;
 312
 313         z8530_describe(dev, "I/O", iobase);
 314         dev->active = 1;
 315         return b;
 316
 317 free_netdev0:
 318         unregister_hdlc_device(b->dev[0].chan->netdevice);
 319         free_netdev(b->dev[0].chan->netdevice);
 320 free_hw:
 321         free_dma(dev->chanA.rxdma);
 322 err_dma_rx:
 323         free_dma(dev->chanA.txdma);
 324 err_dma_tx:
 325         free_irq(irq, dev);
 326 err_request_irq:
 327         kfree(b);
 328 err_kzalloc:
 329         release_region(iobase, 8);
 330         return NULL;
 331 }
 332
 333 static void __exit slvl_shutdown(struct slvl_board *b)
 334 {
 335         int u;
 336
 337         z8530_shutdown(&b->board);
 338
 339         for (u = 0; u < 2; u++)
 340         {
 341                 struct net_device *d = b->dev[u].chan->netdevice;
 342                 unregister_hdlc_device(d);
 343                 free_netdev(d);
 344         }
 345
 346         free_irq(b->board.irq, &b->board);
 347         free_dma(b->board.chanA.rxdma);
 348         free_dma(b->board.chanA.txdma);
 349         /* DMA off on the card, drop DTR */
 350         outb(0, b->iobase);
 351         release_region(b->iobase, 8);
 352         kfree(b);
 353 }
 354
 355
 356 static int io=0x238;
 357 static int txdma=1;
 358 static int rxdma=3;
 359 static int irq=5;
 360 static int slow=0;
 361
 362 module_param(io, int, 0);
 363 MODULE_PARM_DESC(io, "The I/O base of the Sealevel card");
 364 module_param(txdma, int, 0);
 365 MODULE_PARM_DESC(txdma, "Transmit DMA channel");
 366 module_param(rxdma, int, 0);
 367 MODULE_PARM_DESC(rxdma, "Receive DMA channel");
 368 module_param(irq, int, 0);
 369 MODULE_PARM_DESC(irq, "The interrupt line setting for the SeaLevel card");
 370 module_param(slow, bool, 0);
 371 MODULE_PARM_DESC(slow, "Set this for an older Sealevel card such as the 4012");
 372
 373 MODULE_AUTHOR("Alan Cox");
 374 MODULE_LICENSE("GPL");
 375 MODULE_DESCRIPTION("Modular driver for the SeaLevel 4021");
 376
 377 static struct slvl_board *slvl_unit;
 378
 379 static int __init slvl_init_module(void)
 380 {
 381         slvl_unit = slvl_init(io, irq, txdma, rxdma, slow);
 382
 383         return slvl_unit ? 0 : -ENODEV;
 384 }
 385
 386 static void __exit slvl_cleanup_module(void)
 387 {
 388         if(slvl_unit)
 389                 slvl_shutdown(slvl_unit);
 390 }
 391
 392 module_init(slvl_init_module);
 393 module_exit(slvl_cleanup_module);