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 }
  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 = dev_to_chan(d);
  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         err = hdlc_open(d);
 101         if (err) {
 102                 switch (unit) {
 103                         case 0:
 104                                 z8530_sync_dma_close(d, slvl->chan);
 105                                 break;
 106                         case 1:
 107                                 z8530_sync_close(d, slvl->chan);
 108                                 break;
 109                 }
 110                 return err;
 111         }
 112
 113         slvl->chan->rx_function = sealevel_input;
 114
 115         /*
 116          *      Go go go
 117          */
 118         netif_start_queue(d);
 119         return 0;
 120 }
 121
 122 static int sealevel_close(struct net_device *d)
 123 {
 124         struct slvl_device *slvl = dev_to_chan(d);
 125         int unit = slvl->channel;
 126
 127         /*
 128          *      Discard new frames
 129          */
 130
 131         slvl->chan->rx_function = z8530_null_rx;
 132
 133         hdlc_close(d);
 134         netif_stop_queue(d);
 135
 136         switch (unit)
 137         {
 138                 case 0:
 139                         z8530_sync_dma_close(d, slvl->chan);
 140                         break;
 141                 case 1:
 142                         z8530_sync_close(d, slvl->chan);
 143                         break;
 144         }
 145         return 0;
 146 }
 147
 148 static int sealevel_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
 149 {
 150         /* struct slvl_device *slvl=dev_to_chan(d);
 151            z8530_ioctl(d,&slvl->sync.chanA,ifr,cmd) */
 152         return hdlc_ioctl(d, ifr, cmd);
 153 }
 154
 155 /*
 156  *      Passed network frames, fire them downwind.
 157  */
 158
 159 static netdev_tx_t sealevel_queue_xmit(struct sk_buff *skb,
 160                                              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 const struct net_device_ops sealevel_ops = {
 174         .ndo_open       = sealevel_open,
 175         .ndo_stop       = sealevel_close,
 176         .ndo_change_mtu = hdlc_change_mtu,
 177         .ndo_start_xmit = hdlc_start_xmit,
 178         .ndo_do_ioctl   = sealevel_ioctl,
 179 };
 180
 181 static int slvl_setup(struct slvl_device *sv, int iobase, int irq)
 182 {
 183         struct net_device *dev = alloc_hdlcdev(sv);
 184         if (!dev)
 185                 return -1;
 186
 187         dev_to_hdlc(dev)->attach = sealevel_attach;
 188         dev_to_hdlc(dev)->xmit = sealevel_queue_xmit;
 189         dev->netdev_ops = &sealevel_ops;
 190         dev->base_addr = iobase;
 191         dev->irq = irq;
 192
 193         if (register_hdlc_device(dev)) {
 194                 printk(KERN_ERR "sealevel: unable to register HDLC device\n");
 195                 free_netdev(dev);
 196                 return -1;
 197         }
 198
 199         sv->chan->netdevice = dev;
 200         return 0;
 201 }
 202
 203
 204 /*
 205  *      Allocate and setup Sealevel board.
 206  */
 207
 208 static __init struct slvl_board *slvl_init(int iobase, int irq,
 209                                            int txdma, int rxdma, int slow)
 210 {
 211         struct z8530_dev *dev;
 212         struct slvl_board *b;
 213
 214         /*
 215          *      Get the needed I/O space
 216          */
 217
 218         if (!request_region(iobase, 8, "Sealevel 4021")) {
 219                 printk(KERN_WARNING "sealevel: I/O 0x%X already in use.\n",
 220                        iobase);
 221                 return NULL;
 222         }
 223
 224         b = kzalloc(sizeof(struct slvl_board), GFP_KERNEL);
 225         if (!b)
 226                 goto err_kzalloc;
 227
 228         b->dev[0].chan = &b->board.chanA;
 229         b->dev[0].channel = 0;
 230
 231         b->dev[1].chan = &b->board.chanB;
 232         b->dev[1].channel = 1;
 233
 234         dev = &b->board;
 235
 236         /*
 237          *      Stuff in the I/O addressing
 238          */
 239
 240         dev->active = 0;
 241
 242         b->iobase = iobase;
 243
 244         /*
 245          *      Select 8530 delays for the old board
 246          */
 247
 248         if (slow)
 249                 iobase |= Z8530_PORT_SLEEP;
 250
 251         dev->chanA.ctrlio = iobase + 1;
 252         dev->chanA.dataio = iobase;
 253         dev->chanB.ctrlio = iobase + 3;
 254         dev->chanB.dataio = iobase + 2;
 255
 256         dev->chanA.irqs = &z8530_nop;
 257         dev->chanB.irqs = &z8530_nop;
 258
 259         /*
 260          *      Assert DTR enable DMA
 261          */
 262
 263         outb(3 | (1 << 7), b->iobase + 4);
 264
 265
 266         /* We want a fast IRQ for this device. Actually we'd like an even faster
 267            IRQ ;) - This is one driver RtLinux is made for */
 268
 269         if (request_irq(irq, &z8530_interrupt, IRQF_DISABLED,
 270                         "SeaLevel", dev) < 0) {
 271                 printk(KERN_WARNING "sealevel: IRQ %d already in use.\n", irq);
 272                 goto err_request_irq;
 273         }
 274
 275         dev->irq = irq;
 276         dev->chanA.private = &b->dev[0];
 277         dev->chanB.private = &b->dev[1];
 278         dev->chanA.dev = dev;
 279         dev->chanB.dev = dev;
 280
 281         dev->chanA.txdma = 3;
 282         dev->chanA.rxdma = 1;
 283         if (request_dma(dev->chanA.txdma, "SeaLevel (TX)"))
 284                 goto err_dma_tx;
 285
 286         if (request_dma(dev->chanA.rxdma, "SeaLevel (RX)"))
 287                 goto err_dma_rx;
 288
 289         disable_irq(irq);
 290
 291         /*
 292          *      Begin normal initialise
 293          */
 294
 295         if (z8530_init(dev) != 0) {
 296                 printk(KERN_ERR "Z8530 series device not found.\n");
 297                 enable_irq(irq);
 298                 goto free_hw;
 299         }
 300         if (dev->type == Z85C30) {
 301                 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream);
 302                 z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream);
 303         } else {
 304                 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream_85230);
 305                 z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream_85230);
 306         }
 307
 308         /*
 309          *      Now we can take the IRQ
 310          */
 311
 312         enable_irq(irq);
 313
 314         if (slvl_setup(&b->dev[0], iobase, irq))
 315                 goto free_hw;
 316         if (slvl_setup(&b->dev[1], iobase, irq))
 317                 goto free_netdev0;
 318
 319         z8530_describe(dev, "I/O", iobase);
 320         dev->active = 1;
 321         return b;
 322
 323 free_netdev0:
 324         unregister_hdlc_device(b->dev[0].chan->netdevice);
 325         free_netdev(b->dev[0].chan->netdevice);
 326 free_hw:
 327         free_dma(dev->chanA.rxdma);
 328 err_dma_rx:
 329         free_dma(dev->chanA.txdma);
 330 err_dma_tx:
 331         free_irq(irq, dev);
 332 err_request_irq:
 333         kfree(b);
 334 err_kzalloc:
 335         release_region(iobase, 8);
 336         return NULL;
 337 }
 338
 339 static void __exit slvl_shutdown(struct slvl_board *b)
 340 {
 341         int u;
 342
 343         z8530_shutdown(&b->board);
 344
 345         for (u = 0; u < 2; u++)
 346         {
 347                 struct net_device *d = b->dev[u].chan->netdevice;
 348                 unregister_hdlc_device(d);
 349                 free_netdev(d);
 350         }
 351
 352         free_irq(b->board.irq, &b->board);
 353         free_dma(b->board.chanA.rxdma);
 354         free_dma(b->board.chanA.txdma);
 355         /* DMA off on the card, drop DTR */
 356         outb(0, b->iobase);
 357         release_region(b->iobase, 8);
 358         kfree(b);
 359 }
 360
 361
 362 static int io=0x238;
 363 static int txdma=1;
 364 static int rxdma=3;
 365 static int irq=5;
 366 static int slow=0;
 367
 368 module_param(io, int, 0);
 369 MODULE_PARM_DESC(io, "The I/O base of the Sealevel card");
 370 module_param(txdma, int, 0);
 371 MODULE_PARM_DESC(txdma, "Transmit DMA channel");
 372 module_param(rxdma, int, 0);
 373 MODULE_PARM_DESC(rxdma, "Receive DMA channel");
 374 module_param(irq, int, 0);
 375 MODULE_PARM_DESC(irq, "The interrupt line setting for the SeaLevel card");
 376 module_param(slow, bool, 0);
 377 MODULE_PARM_DESC(slow, "Set this for an older Sealevel card such as the 4012");
 378
 379 MODULE_AUTHOR("Alan Cox");
 380 MODULE_LICENSE("GPL");
 381 MODULE_DESCRIPTION("Modular driver for the SeaLevel 4021");
 382
 383 static struct slvl_board *slvl_unit;
 384
 385 static int __init slvl_init_module(void)
 386 {
 387         slvl_unit = slvl_init(io, irq, txdma, rxdma, slow);
 388
 389         return slvl_unit ? 0 : -ENODEV;
 390 }
 391
 392 static void __exit slvl_cleanup_module(void)
 393 {
 394         if(slvl_unit)
 395                 slvl_shutdown(slvl_unit);
 396 }
 397
 398 module_init(slvl_init_module);
 399 module_exit(slvl_cleanup_module);