kernel/2.6.29.6-aldebaran-rt/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 int sealevel_queue_xmit(struct sk_buff *skb, struct net_device *d)
 160 {
 161         return z8530_queue_xmit(dev_to_chan(d)->chan, skb);
 162 }
 163
 164 static int sealevel_attach(struct net_device *dev, unsigned short encoding,
 165                            unsigned short parity)
 166 {
 167         if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT)
 168                 return 0;
 169         return -EINVAL;
 170 }
 171
 172 static int slvl_setup(struct slvl_device *sv, int iobase, int irq)
 173 {
 174         struct net_device *dev = alloc_hdlcdev(sv);
 175         if (!dev)
 176                 return -1;
 177
 178         dev_to_hdlc(dev)->attach = sealevel_attach;
 179         dev_to_hdlc(dev)->xmit = sealevel_queue_xmit;
 180         dev->open = sealevel_open;
 181         dev->stop = sealevel_close;
 182         dev->do_ioctl = sealevel_ioctl;
 183         dev->base_addr = iobase;
 184         dev->irq = irq;
 185
 186         if (register_hdlc_device(dev)) {
 187                 printk(KERN_ERR "sealevel: unable to register HDLC device\n");
 188                 free_netdev(dev);
 189                 return -1;
 190         }
 191
 192         sv->chan->netdevice = dev;
 193         return 0;
 194 }
 195
 196
 197 /*
 198  *      Allocate and setup Sealevel board.
 199  */
 200
 201 static __init struct slvl_board *slvl_init(int iobase, int irq,
 202                                            int txdma, int rxdma, int slow)
 203 {
 204         struct z8530_dev *dev;
 205         struct slvl_board *b;
 206
 207         /*
 208          *      Get the needed I/O space
 209          */
 210
 211         if (!request_region(iobase, 8, "Sealevel 4021")) {
 212                 printk(KERN_WARNING "sealevel: I/O 0x%X already in use.\n",
 213                        iobase);
 214                 return NULL;
 215         }
 216
 217         b = kzalloc(sizeof(struct slvl_board), GFP_KERNEL);
 218         if (!b)
 219                 goto err_kzalloc;
 220
 221         b->dev[0].chan = &b->board.chanA;
 222         b->dev[0].channel = 0;
 223
 224         b->dev[1].chan = &b->board.chanB;
 225         b->dev[1].channel = 1;
 226
 227         dev = &b->board;
 228
 229         /*
 230          *      Stuff in the I/O addressing
 231          */
 232
 233         dev->active = 0;
 234
 235         b->iobase = iobase;
 236
 237         /*
 238          *      Select 8530 delays for the old board
 239          */
 240
 241         if (slow)
 242                 iobase |= Z8530_PORT_SLEEP;
 243
 244         dev->chanA.ctrlio = iobase + 1;
 245         dev->chanA.dataio = iobase;
 246         dev->chanB.ctrlio = iobase + 3;
 247         dev->chanB.dataio = iobase + 2;
 248
 249         dev->chanA.irqs = &z8530_nop;
 250         dev->chanB.irqs = &z8530_nop;
 251
 252         /*
 253          *      Assert DTR enable DMA
 254          */
 255
 256         outb(3 | (1 << 7), b->iobase + 4);
 257
 258
 259         /* We want a fast IRQ for this device. Actually we'd like an even faster
 260            IRQ ;) - This is one driver RtLinux is made for */
 261
 262         if (request_irq(irq, &z8530_interrupt, IRQF_DISABLED,
 263                         "SeaLevel", dev) < 0) {
 264                 printk(KERN_WARNING "sealevel: IRQ %d already in use.\n", irq);
 265                 goto err_request_irq;
 266         }
 267
 268         dev->irq = irq;
 269         dev->chanA.private = &b->dev[0];
 270         dev->chanB.private = &b->dev[1];
 271         dev->chanA.dev = dev;
 272         dev->chanB.dev = dev;
 273
 274         dev->chanA.txdma = 3;
 275         dev->chanA.rxdma = 1;
 276         if (request_dma(dev->chanA.txdma, "SeaLevel (TX)"))
 277                 goto err_dma_tx;
 278
 279         if (request_dma(dev->chanA.rxdma, "SeaLevel (RX)"))
 280                 goto err_dma_rx;
 281
 282         disable_irq(irq);
 283
 284         /*
 285          *      Begin normal initialise
 286          */
 287
 288         if (z8530_init(dev) != 0) {
 289                 printk(KERN_ERR "Z8530 series device not found.\n");
 290                 enable_irq(irq);
 291                 goto free_hw;
 292         }
 293         if (dev->type == Z85C30) {
 294                 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream);
 295                 z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream);
 296         } else {
 297                 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream_85230);
 298                 z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream_85230);
 299         }
 300
 301         /*
 302          *      Now we can take the IRQ
 303          */
 304
 305         enable_irq(irq);
 306
 307         if (slvl_setup(&b->dev[0], iobase, irq))
 308                 goto free_hw;
 309         if (slvl_setup(&b->dev[1], iobase, irq))
 310                 goto free_netdev0;
 311
 312         z8530_describe(dev, "I/O", iobase);
 313         dev->active = 1;
 314         return b;
 315
 316 free_netdev0:
 317         unregister_hdlc_device(b->dev[0].chan->netdevice);
 318         free_netdev(b->dev[0].chan->netdevice);
 319 free_hw:
 320         free_dma(dev->chanA.rxdma);
 321 err_dma_rx:
 322         free_dma(dev->chanA.txdma);
 323 err_dma_tx:
 324         free_irq(irq, dev);
 325 err_request_irq:
 326         kfree(b);
 327 err_kzalloc:
 328         release_region(iobase, 8);
 329         return NULL;
 330 }
 331
 332 static void __exit slvl_shutdown(struct slvl_board *b)
 333 {
 334         int u;
 335
 336         z8530_shutdown(&b->board);
 337
 338         for (u = 0; u < 2; u++)
 339         {
 340                 struct net_device *d = b->dev[u].chan->netdevice;
 341                 unregister_hdlc_device(d);
 342                 free_netdev(d);
 343         }
 344
 345         free_irq(b->board.irq, &b->board);
 346         free_dma(b->board.chanA.rxdma);
 347         free_dma(b->board.chanA.txdma);
 348         /* DMA off on the card, drop DTR */
 349         outb(0, b->iobase);
 350         release_region(b->iobase, 8);
 351         kfree(b);
 352 }
 353
 354
 355 static int io=0x238;
 356 static int txdma=1;
 357 static int rxdma=3;
 358 static int irq=5;
 359 static int slow=0;
 360
 361 module_param(io, int, 0);
 362 MODULE_PARM_DESC(io, "The I/O base of the Sealevel card");
 363 module_param(txdma, int, 0);
 364 MODULE_PARM_DESC(txdma, "Transmit DMA channel");
 365 module_param(rxdma, int, 0);
 366 MODULE_PARM_DESC(rxdma, "Receive DMA channel");
 367 module_param(irq, int, 0);
 368 MODULE_PARM_DESC(irq, "The interrupt line setting for the SeaLevel card");
 369 module_param(slow, bool, 0);
 370 MODULE_PARM_DESC(slow, "Set this for an older Sealevel card such as the 4012");
 371
 372 MODULE_AUTHOR("Alan Cox");
 373 MODULE_LICENSE("GPL");
 374 MODULE_DESCRIPTION("Modular driver for the SeaLevel 4021");
 375
 376 static struct slvl_board *slvl_unit;
 377
 378 static int __init slvl_init_module(void)
 379 {
 380         slvl_unit = slvl_init(io, irq, txdma, rxdma, slow);
 381
 382         return slvl_unit ? 0 : -ENODEV;
 383 }
 384
 385 static void __exit slvl_cleanup_module(void)
 386 {
 387         if(slvl_unit)
 388                 slvl_shutdown(slvl_unit);
 389 }
 390
 391 module_init(slvl_init_module);
 392 module_exit(slvl_cleanup_module);