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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  16
  17 #include <linux/module.h>
  18 #include <linux/kernel.h>
  19 #include <linux/mm.h>
  20 #include <linux/net.h>
  21 #include <linux/skbuff.h>
  22 #include <linux/netdevice.h>
  23 #include <linux/if_arp.h>
  24 #include <linux/delay.h>
  25 #include <linux/hdlc.h>
  26 #include <linux/ioport.h>
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <net/arp.h>
  30
  31 #include <asm/irq.h>
  32 #include <asm/io.h>
  33 #include <asm/dma.h>
  34 #include <asm/byteorder.h>
  35 #include "z85230.h"
  36
  37
  38 struct slvl_device
  39 {
  40         struct z8530_channel *chan;
  41         int channel;
  42 };
  43
  44
  45 struct slvl_board
  46 {
  47         struct slvl_device dev[2];
  48         struct z8530_dev board;
  49         int iobase;
  50 };
  51
  52 /*
  53  *      Network driver support routines
  54  */
  55
  56 static inline struct slvl_device* dev_to_chan(struct net_device *dev)
  57 {
  58         return (struct slvl_device *)dev_to_hdlc(dev)->priv;
  59 }
  60
  61 /*
  62  *      Frame receive. Simple for our card as we do HDLC and there
  63  *      is no funny garbage involved
  64  */
  65
  66 static void sealevel_input(struct z8530_channel *c, struct sk_buff *skb)
  67 {
  68         /* Drop the CRC - it's not a good idea to try and negotiate it ;) */
  69         skb_trim(skb, skb->len - 2);
  70         skb->protocol = hdlc_type_trans(skb, c->netdevice);
  71         skb_reset_mac_header(skb);
  72         skb->dev = c->netdevice;
  73         netif_rx(skb);
  74 }
  75
  76 /*
  77  *      We've been placed in the UP state
  78  */
  79
  80 static int sealevel_open(struct net_device *d)
  81 {
  82         struct slvl_device *slvl = dev_to_chan(d);
  83         int err = -1;
  84         int unit = slvl->channel;
  85
  86         /*
  87          *      Link layer up.
  88          */
  89
  90         switch (unit) {
  91                 case 0:
  92                         err = z8530_sync_dma_open(d, slvl->chan);
  93                         break;
  94                 case 1:
  95                         err = z8530_sync_open(d, slvl->chan);
  96                         break;
  97         }
  98
  99         if (err)
 100                 return err;
 101
 102         err = hdlc_open(d);
 103         if (err) {
 104                 switch (unit) {
 105                         case 0:
 106                                 z8530_sync_dma_close(d, slvl->chan);
 107                                 break;
 108                         case 1:
 109                                 z8530_sync_close(d, slvl->chan);
 110                                 break;
 111                 }
 112                 return err;
 113         }
 114
 115         slvl->chan->rx_function = sealevel_input;
 116
 117         /*
 118          *      Go go go
 119          */
 120         netif_start_queue(d);
 121         return 0;
 122 }
 123
 124 static int sealevel_close(struct net_device *d)
 125 {
 126         struct slvl_device *slvl = dev_to_chan(d);
 127         int unit = slvl->channel;
 128
 129         /*
 130          *      Discard new frames
 131          */
 132
 133         slvl->chan->rx_function = z8530_null_rx;
 134
 135         hdlc_close(d);
 136         netif_stop_queue(d);
 137
 138         switch (unit) {
 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 netdev_tx_t sealevel_queue_xmit(struct sk_buff *skb,
 161                                              struct net_device *d)
 162 {
 163         return z8530_queue_xmit(dev_to_chan(d)->chan, skb);
 164 }
 165
 166 static int sealevel_attach(struct net_device *dev, unsigned short encoding,
 167                            unsigned short parity)
 168 {
 169         if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT)
 170                 return 0;
 171         return -EINVAL;
 172 }
 173
 174 static const struct net_device_ops sealevel_ops = {
 175         .ndo_open       = sealevel_open,
 176         .ndo_stop       = sealevel_close,
 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                 pr_err("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                 pr_warn("I/O 0x%X already in use\n", iobase);
 220                 return NULL;
 221         }
 222
 223         b = kzalloc(sizeof(struct slvl_board), GFP_KERNEL);
 224         if (!b)
 225                 goto err_kzalloc;
 226
 227         b->dev[0].chan = &b->board.chanA;
 228         b->dev[0].channel = 0;
 229
 230         b->dev[1].chan = &b->board.chanB;
 231         b->dev[1].channel = 1;
 232
 233         dev = &b->board;
 234
 235         /*
 236          *      Stuff in the I/O addressing
 237          */
 238
 239         dev->active = 0;
 240
 241         b->iobase = iobase;
 242
 243         /*
 244          *      Select 8530 delays for the old board
 245          */
 246
 247         if (slow)
 248                 iobase |= Z8530_PORT_SLEEP;
 249
 250         dev->chanA.ctrlio = iobase + 1;
 251         dev->chanA.dataio = iobase;
 252         dev->chanB.ctrlio = iobase + 3;
 253         dev->chanB.dataio = iobase + 2;
 254
 255         dev->chanA.irqs = &z8530_nop;
 256         dev->chanB.irqs = &z8530_nop;
 257
 258         /*
 259          *      Assert DTR enable DMA
 260          */
 261
 262         outb(3 | (1 << 7), b->iobase + 4);
 263
 264
 265         /* We want a fast IRQ for this device. Actually we'd like an even faster
 266            IRQ ;) - This is one driver RtLinux is made for */
 267
 268         if (request_irq(irq, z8530_interrupt, 0,
 269                         "SeaLevel", dev) < 0) {
 270                 pr_warn("IRQ %d already in use\n", irq);
 271                 goto err_request_irq;
 272         }
 273
 274         dev->irq = irq;
 275         dev->chanA.private = &b->dev[0];
 276         dev->chanB.private = &b->dev[1];
 277         dev->chanA.dev = dev;
 278         dev->chanB.dev = dev;
 279
 280         dev->chanA.txdma = 3;
 281         dev->chanA.rxdma = 1;
 282         if (request_dma(dev->chanA.txdma, "SeaLevel (TX)"))
 283                 goto err_dma_tx;
 284
 285         if (request_dma(dev->chanA.rxdma, "SeaLevel (RX)"))
 286                 goto err_dma_rx;
 287
 288         disable_irq(irq);
 289
 290         /*
 291          *      Begin normal initialise
 292          */
 293
 294         if (z8530_init(dev) != 0) {
 295                 pr_err("Z8530 series device not found\n");
 296                 enable_irq(irq);
 297                 goto free_hw;
 298         }
 299         if (dev->type == Z85C30) {
 300                 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream);
 301                 z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream);
 302         } else {
 303                 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream_85230);
 304                 z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream_85230);
 305         }
 306
 307         /*
 308          *      Now we can take the IRQ
 309          */
 310
 311         enable_irq(irq);
 312
 313         if (slvl_setup(&b->dev[0], iobase, irq))
 314                 goto free_hw;
 315         if (slvl_setup(&b->dev[1], iobase, irq))
 316                 goto free_netdev0;
 317
 318         z8530_describe(dev, "I/O", iobase);
 319         dev->active = 1;
 320         return b;
 321
 322 free_netdev0:
 323         unregister_hdlc_device(b->dev[0].chan->netdevice);
 324         free_netdev(b->dev[0].chan->netdevice);
 325 free_hw:
 326         free_dma(dev->chanA.rxdma);
 327 err_dma_rx:
 328         free_dma(dev->chanA.txdma);
 329 err_dma_tx:
 330         free_irq(irq, dev);
 331 err_request_irq:
 332         kfree(b);
 333 err_kzalloc:
 334         release_region(iobase, 8);
 335         return NULL;
 336 }
 337
 338 static void __exit slvl_shutdown(struct slvl_board *b)
 339 {
 340         int u;
 341
 342         z8530_shutdown(&b->board);
 343
 344         for (u = 0; u < 2; u++) {
 345                 struct net_device *d = b->dev[u].chan->netdevice;
 346                 unregister_hdlc_device(d);
 347                 free_netdev(d);
 348         }
 349
 350         free_irq(b->board.irq, &b->board);
 351         free_dma(b->board.chanA.rxdma);
 352         free_dma(b->board.chanA.txdma);
 353         /* DMA off on the card, drop DTR */
 354         outb(0, b->iobase);
 355         release_region(b->iobase, 8);
 356         kfree(b);
 357 }
 358
 359
 360 static int io=0x238;
 361 static int txdma=1;
 362 static int rxdma=3;
 363 static int irq=5;
 364 static bool slow=false;
 365
 366 module_param_hw(io, int, ioport, 0);
 367 MODULE_PARM_DESC(io, "The I/O base of the Sealevel card");
 368 module_param_hw(txdma, int, dma, 0);
 369 MODULE_PARM_DESC(txdma, "Transmit DMA channel");
 370 module_param_hw(rxdma, int, dma, 0);
 371 MODULE_PARM_DESC(rxdma, "Receive DMA channel");
 372 module_param_hw(irq, int, irq, 0);
 373 MODULE_PARM_DESC(irq, "The interrupt line setting for the SeaLevel card");
 374 module_param(slow, bool, 0);
 375 MODULE_PARM_DESC(slow, "Set this for an older Sealevel card such as the 4012");
 376
 377 MODULE_AUTHOR("Alan Cox");
 378 MODULE_LICENSE("GPL");
 379 MODULE_DESCRIPTION("Modular driver for the SeaLevel 4021");
 380
 381 static struct slvl_board *slvl_unit;
 382
 383 static int __init slvl_init_module(void)
 384 {
 385         slvl_unit = slvl_init(io, irq, txdma, rxdma, slow);
 386
 387         return slvl_unit ? 0 : -ENODEV;
 388 }
 389
 390 static void __exit slvl_cleanup_module(void)
 391 {
 392         if (slvl_unit)
 393                 slvl_shutdown(slvl_unit);
 394 }
 395
 396 module_init(slvl_init_module);
 397 module_exit(slvl_cleanup_module);