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                 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         err = hdlc_open(d);
 100         if (err) {
 101                 switch (unit) {
 102                         case 0:
 103                                 z8530_sync_dma_close(d, slvl->chan);
 104                                 break;
 105                         case 1:
 106                                 z8530_sync_close(d, slvl->chan);
 107                                 break;
 108                 }
 109                 return err;
 110         }
 111
 112         slvl->chan->rx_function = sealevel_input;
 113
 114         /*
 115          *      Go go go
 116          */
 117         netif_start_queue(d);
 118         return 0;
 119 }
 120
 121 static int sealevel_close(struct net_device *d)
 122 {
 123         struct slvl_device *slvl = dev_to_chan(d);
 124         int unit = slvl->channel;
 125
 126         /*
 127          *      Discard new frames
 128          */
 129
 130         slvl->chan->rx_function = z8530_null_rx;
 131
 132         hdlc_close(d);
 133         netif_stop_queue(d);
 134
 135         switch (unit) {
 136                 case 0:
 137                         z8530_sync_dma_close(d, slvl->chan);
 138                         break;
 139                 case 1:
 140                         z8530_sync_close(d, slvl->chan);
 141                         break;
 142         }
 143         return 0;
 144 }
 145
 146 static int sealevel_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
 147 {
 148         /* struct slvl_device *slvl=dev_to_chan(d);
 149            z8530_ioctl(d,&slvl->sync.chanA,ifr,cmd) */
 150         return hdlc_ioctl(d, ifr, cmd);
 151 }
 152
 153 /*
 154  *      Passed network frames, fire them downwind.
 155  */
 156
 157 static netdev_tx_t sealevel_queue_xmit(struct sk_buff *skb,
 158                                              struct net_device *d)
 159 {
 160         return z8530_queue_xmit(dev_to_chan(d)->chan, skb);
 161 }
 162
 163 static int sealevel_attach(struct net_device *dev, unsigned short encoding,
 164                            unsigned short parity)
 165 {
 166         if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT)
 167                 return 0;
 168         return -EINVAL;
 169 }
 170
 171 static const struct net_device_ops sealevel_ops = {
 172         .ndo_open       = sealevel_open,
 173         .ndo_stop       = sealevel_close,
 174         .ndo_change_mtu = hdlc_change_mtu,
 175         .ndo_start_xmit = hdlc_start_xmit,
 176         .ndo_do_ioctl   = sealevel_ioctl,
 177 };
 178
 179 static int slvl_setup(struct slvl_device *sv, int iobase, int irq)
 180 {
 181         struct net_device *dev = alloc_hdlcdev(sv);
 182         if (!dev)
 183                 return -1;
 184
 185         dev_to_hdlc(dev)->attach = sealevel_attach;
 186         dev_to_hdlc(dev)->xmit = sealevel_queue_xmit;
 187         dev->netdev_ops = &sealevel_ops;
 188         dev->base_addr = iobase;
 189         dev->irq = irq;
 190
 191         if (register_hdlc_device(dev)) {
 192                 printk(KERN_ERR "sealevel: unable to register HDLC device\n");
 193                 free_netdev(dev);
 194                 return -1;
 195         }
 196
 197         sv->chan->netdevice = dev;
 198         return 0;
 199 }
 200
 201
 202 /*
 203  *      Allocate and setup Sealevel board.
 204  */
 205
 206 static __init struct slvl_board *slvl_init(int iobase, int irq,
 207                                            int txdma, int rxdma, int slow)
 208 {
 209         struct z8530_dev *dev;
 210         struct slvl_board *b;
 211
 212         /*
 213          *      Get the needed I/O space
 214          */
 215
 216         if (!request_region(iobase, 8, "Sealevel 4021")) {
 217                 printk(KERN_WARNING "sealevel: I/O 0x%X already in use.\n",
 218                        iobase);
 219                 return NULL;
 220         }
 221
 222         b = kzalloc(sizeof(struct slvl_board), GFP_KERNEL);
 223         if (!b)
 224                 goto err_kzalloc;
 225
 226         b->dev[0].chan = &b->board.chanA;
 227         b->dev[0].channel = 0;
 228
 229         b->dev[1].chan = &b->board.chanB;
 230         b->dev[1].channel = 1;
 231
 232         dev = &b->board;
 233
 234         /*
 235          *      Stuff in the I/O addressing
 236          */
 237
 238         dev->active = 0;
 239
 240         b->iobase = iobase;
 241
 242         /*
 243          *      Select 8530 delays for the old board
 244          */
 245
 246         if (slow)
 247                 iobase |= Z8530_PORT_SLEEP;
 248
 249         dev->chanA.ctrlio = iobase + 1;
 250         dev->chanA.dataio = iobase;
 251         dev->chanB.ctrlio = iobase + 3;
 252         dev->chanB.dataio = iobase + 2;
 253
 254         dev->chanA.irqs = &z8530_nop;
 255         dev->chanB.irqs = &z8530_nop;
 256
 257         /*
 258          *      Assert DTR enable DMA
 259          */
 260
 261         outb(3 | (1 << 7), b->iobase + 4);
 262
 263
 264         /* We want a fast IRQ for this device. Actually we'd like an even faster
 265            IRQ ;) - This is one driver RtLinux is made for */
 266
 267         if (request_irq(irq, z8530_interrupt, IRQF_DISABLED,
 268                         "SeaLevel", dev) < 0) {
 269                 printk(KERN_WARNING "sealevel: IRQ %d already in use.\n", irq);
 270                 goto err_request_irq;
 271         }
 272
 273         dev->irq = irq;
 274         dev->chanA.private = &b->dev[0];
 275         dev->chanB.private = &b->dev[1];
 276         dev->chanA.dev = dev;
 277         dev->chanB.dev = dev;
 278
 279         dev->chanA.txdma = 3;
 280         dev->chanA.rxdma = 1;
 281         if (request_dma(dev->chanA.txdma, "SeaLevel (TX)"))
 282                 goto err_dma_tx;
 283
 284         if (request_dma(dev->chanA.rxdma, "SeaLevel (RX)"))
 285                 goto err_dma_rx;
 286
 287         disable_irq(irq);
 288
 289         /*
 290          *      Begin normal initialise
 291          */
 292
 293         if (z8530_init(dev) != 0) {
 294                 printk(KERN_ERR "Z8530 series device not found.\n");
 295                 enable_irq(irq);
 296                 goto free_hw;
 297         }
 298         if (dev->type == Z85C30) {
 299                 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream);
 300                 z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream);
 301         } else {
 302                 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream_85230);
 303                 z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream_85230);
 304         }
 305
 306         /*
 307          *      Now we can take the IRQ
 308          */
 309
 310         enable_irq(irq);
 311
 312         if (slvl_setup(&b->dev[0], iobase, irq))
 313                 goto free_hw;
 314         if (slvl_setup(&b->dev[1], iobase, irq))
 315                 goto free_netdev0;
 316
 317         z8530_describe(dev, "I/O", iobase);
 318         dev->active = 1;
 319         return b;
 320
 321 free_netdev0:
 322         unregister_hdlc_device(b->dev[0].chan->netdevice);
 323         free_netdev(b->dev[0].chan->netdevice);
 324 free_hw:
 325         free_dma(dev->chanA.rxdma);
 326 err_dma_rx:
 327         free_dma(dev->chanA.txdma);
 328 err_dma_tx:
 329         free_irq(irq, dev);
 330 err_request_irq:
 331         kfree(b);
 332 err_kzalloc:
 333         release_region(iobase, 8);
 334         return NULL;
 335 }
 336
 337 static void __exit slvl_shutdown(struct slvl_board *b)
 338 {
 339         int u;
 340
 341         z8530_shutdown(&b->board);
 342
 343         for (u = 0; u < 2; u++) {
 344                 struct net_device *d = b->dev[u].chan->netdevice;
 345                 unregister_hdlc_device(d);
 346                 free_netdev(d);
 347         }
 348
 349         free_irq(b->board.irq, &b->board);
 350         free_dma(b->board.chanA.rxdma);
 351         free_dma(b->board.chanA.txdma);
 352         /* DMA off on the card, drop DTR */
 353         outb(0, b->iobase);
 354         release_region(b->iobase, 8);
 355         kfree(b);
 356 }
 357
 358
 359 static int io=0x238;
 360 static int txdma=1;
 361 static int rxdma=3;
 362 static int irq=5;
 363 static int slow=0;
 364
 365 module_param(io, int, 0);
 366 MODULE_PARM_DESC(io, "The I/O base of the Sealevel card");
 367 module_param(txdma, int, 0);
 368 MODULE_PARM_DESC(txdma, "Transmit DMA channel");
 369 module_param(rxdma, int, 0);
 370 MODULE_PARM_DESC(rxdma, "Receive DMA channel");
 371 module_param(irq, int, 0);
 372 MODULE_PARM_DESC(irq, "The interrupt line setting for the SeaLevel card");
 373 module_param(slow, bool, 0);
 374 MODULE_PARM_DESC(slow, "Set this for an older Sealevel card such as the 4012");
 375
 376 MODULE_AUTHOR("Alan Cox");
 377 MODULE_LICENSE("GPL");
 378 MODULE_DESCRIPTION("Modular driver for the SeaLevel 4021");
 379
 380 static struct slvl_board *slvl_unit;
 381
 382 static int __init slvl_init_module(void)
 383 {
 384         slvl_unit = slvl_init(io, irq, txdma, rxdma, slow);
 385
 386         return slvl_unit ? 0 : -ENODEV;
 387 }
 388
 389 static void __exit slvl_cleanup_module(void)
 390 {
 391         if (slvl_unit)
 392                 slvl_shutdown(slvl_unit);
 393 }
 394
 395 module_init(slvl_init_module);
 396 module_exit(slvl_cleanup_module);