drivers/net/wan/sealevel.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      Sealevel Systems 4021 driver.
   4  *
   5  *      (c) Copyright 1999, 2001 Alan Cox
   6  *      (c) Copyright 2001 Red Hat Inc.
   7  *      Generic HDLC port Copyright (C) 2008 Krzysztof Halasa <khc@pm.waw.pl>
   8  */
   9
  10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  11
  12 #include <linux/module.h>
  13 #include <linux/kernel.h>
  14 #include <linux/mm.h>
  15 #include <linux/net.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/if_arp.h>
  19 #include <linux/delay.h>
  20 #include <linux/hdlc.h>
  21 #include <linux/ioport.h>
  22 #include <linux/init.h>
  23 #include <linux/slab.h>
  24 #include <net/arp.h>
  25
  26 #include <asm/irq.h>
  27 #include <asm/io.h>
  28 #include <asm/dma.h>
  29 #include <asm/byteorder.h>
  30 #include "z85230.h"
  31
  32
  33 struct slvl_device
  34 {
  35         struct z8530_channel *chan;
  36         int channel;
  37 };
  38
  39
  40 struct slvl_board
  41 {
  42         struct slvl_device dev[2];
  43         struct z8530_dev board;
  44         int iobase;
  45 };
  46
  47 /*
  48  *      Network driver support routines
  49  */
  50
  51 static inline struct slvl_device* dev_to_chan(struct net_device *dev)
  52 {
  53         return (struct slvl_device *)dev_to_hdlc(dev)->priv;
  54 }
  55
  56 /*
  57  *      Frame receive. Simple for our card as we do HDLC and there
  58  *      is no funny garbage involved
  59  */
  60
  61 static void sealevel_input(struct z8530_channel *c, struct sk_buff *skb)
  62 {
  63         /* Drop the CRC - it's not a good idea to try and negotiate it ;) */
  64         skb_trim(skb, skb->len - 2);
  65         skb->protocol = hdlc_type_trans(skb, c->netdevice);
  66         skb_reset_mac_header(skb);
  67         skb->dev = c->netdevice;
  68         netif_rx(skb);
  69 }
  70
  71 /*
  72  *      We've been placed in the UP state
  73  */
  74
  75 static int sealevel_open(struct net_device *d)
  76 {
  77         struct slvl_device *slvl = dev_to_chan(d);
  78         int err = -1;
  79         int unit = slvl->channel;
  80
  81         /*
  82          *      Link layer up.
  83          */
  84
  85         switch (unit) {
  86                 case 0:
  87                         err = z8530_sync_dma_open(d, slvl->chan);
  88                         break;
  89                 case 1:
  90                         err = z8530_sync_open(d, slvl->chan);
  91                         break;
  92         }
  93
  94         if (err)
  95                 return err;
  96
  97         err = hdlc_open(d);
  98         if (err) {
  99                 switch (unit) {
 100                         case 0:
 101                                 z8530_sync_dma_close(d, slvl->chan);
 102                                 break;
 103                         case 1:
 104                                 z8530_sync_close(d, slvl->chan);
 105                                 break;
 106                 }
 107                 return err;
 108         }
 109
 110         slvl->chan->rx_function = sealevel_input;
 111
 112         /*
 113          *      Go go go
 114          */
 115         netif_start_queue(d);
 116         return 0;
 117 }
 118
 119 static int sealevel_close(struct net_device *d)
 120 {
 121         struct slvl_device *slvl = dev_to_chan(d);
 122         int unit = slvl->channel;
 123
 124         /*
 125          *      Discard new frames
 126          */
 127
 128         slvl->chan->rx_function = z8530_null_rx;
 129
 130         hdlc_close(d);
 131         netif_stop_queue(d);
 132
 133         switch (unit) {
 134                 case 0:
 135                         z8530_sync_dma_close(d, slvl->chan);
 136                         break;
 137                 case 1:
 138                         z8530_sync_close(d, slvl->chan);
 139                         break;
 140         }
 141         return 0;
 142 }
 143
 144 static int sealevel_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
 145 {
 146         /* struct slvl_device *slvl=dev_to_chan(d);
 147            z8530_ioctl(d,&slvl->sync.chanA,ifr,cmd) */
 148         return hdlc_ioctl(d, ifr, cmd);
 149 }
 150
 151 /*
 152  *      Passed network frames, fire them downwind.
 153  */
 154
 155 static netdev_tx_t sealevel_queue_xmit(struct sk_buff *skb,
 156                                              struct net_device *d)
 157 {
 158         return z8530_queue_xmit(dev_to_chan(d)->chan, skb);
 159 }
 160
 161 static int sealevel_attach(struct net_device *dev, unsigned short encoding,
 162                            unsigned short parity)
 163 {
 164         if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT)
 165                 return 0;
 166         return -EINVAL;
 167 }
 168
 169 static const struct net_device_ops sealevel_ops = {
 170         .ndo_open       = sealevel_open,
 171         .ndo_stop       = sealevel_close,
 172         .ndo_start_xmit = hdlc_start_xmit,
 173         .ndo_do_ioctl   = sealevel_ioctl,
 174 };
 175
 176 static int slvl_setup(struct slvl_device *sv, int iobase, int irq)
 177 {
 178         struct net_device *dev = alloc_hdlcdev(sv);
 179         if (!dev)
 180                 return -1;
 181
 182         dev_to_hdlc(dev)->attach = sealevel_attach;
 183         dev_to_hdlc(dev)->xmit = sealevel_queue_xmit;
 184         dev->netdev_ops = &sealevel_ops;
 185         dev->base_addr = iobase;
 186         dev->irq = irq;
 187
 188         if (register_hdlc_device(dev)) {
 189                 pr_err("unable to register HDLC device\n");
 190                 free_netdev(dev);
 191                 return -1;
 192         }
 193
 194         sv->chan->netdevice = dev;
 195         return 0;
 196 }
 197
 198
 199 /*
 200  *      Allocate and setup Sealevel board.
 201  */
 202
 203 static __init struct slvl_board *slvl_init(int iobase, int irq,
 204                                            int txdma, int rxdma, int slow)
 205 {
 206         struct z8530_dev *dev;
 207         struct slvl_board *b;
 208
 209         /*
 210          *      Get the needed I/O space
 211          */
 212
 213         if (!request_region(iobase, 8, "Sealevel 4021")) {
 214                 pr_warn("I/O 0x%X already in use\n", 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, 0,
 264                         "SeaLevel", dev) < 0) {
 265                 pr_warn("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                 pr_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                 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 bool slow=false;
 360
 361 module_param_hw(io, int, ioport, 0);
 362 MODULE_PARM_DESC(io, "The I/O base of the Sealevel card");
 363 module_param_hw(txdma, int, dma, 0);
 364 MODULE_PARM_DESC(txdma, "Transmit DMA channel");
 365 module_param_hw(rxdma, int, dma, 0);
 366 MODULE_PARM_DESC(rxdma, "Receive DMA channel");
 367 module_param_hw(irq, int, irq, 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);