drivers/net/arcnet/com20020.c

   1 /*
   2  * Linux ARCnet driver - COM20020 chipset support
   3  *
   4  * Written 1997 by David Woodhouse.
   5  * Written 1994-1999 by Avery Pennarun.
   6  * Written 1999 by Martin Mares <mj@ucw.cz>.
   7  * Derived from skeleton.c by Donald Becker.
   8  *
   9  * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
  10  *  for sponsoring the further development of this driver.
  11  *
  12  * **********************
  13  *
  14  * The original copyright of skeleton.c was as follows:
  15  *
  16  * skeleton.c Written 1993 by Donald Becker.
  17  * Copyright 1993 United States Government as represented by the
  18  * Director, National Security Agency.  This software may only be used
  19  * and distributed according to the terms of the GNU General Public License as
  20  * modified by SRC, incorporated herein by reference.
  21  *
  22  * **********************
  23  *
  24  * For more details, see drivers/net/arcnet.c
  25  *
  26  * **********************
  27  */
  28 #include <linux/module.h>
  29 #include <linux/kernel.h>
  30 #include <linux/types.h>
  31 #include <linux/ioport.h>
  32 #include <linux/slab.h>
  33 #include <linux/errno.h>
  34 #include <linux/delay.h>
  35 #include <linux/netdevice.h>
  36 #include <linux/init.h>
  37 #include <linux/arcdevice.h>
  38 #include <linux/com20020.h>
  39
  40 #include <asm/io.h>
  41
  42 #define VERSION "arcnet: COM20020 chipset support (by David Woodhouse et al.)\n"
  43
  44 static char *clockrates[] =
  45 {"10 Mb/s", "Reserved", "5 Mb/s",
  46  "2.5 Mb/s", "1.25Mb/s", "625 Kb/s", "312.5 Kb/s",
  47  "156.25 Kb/s", "Reserved", "Reserved", "Reserved"};
  48
  49 static void com20020_command(struct net_device *dev, int command);
  50 static int com20020_status(struct net_device *dev);
  51 static void com20020_setmask(struct net_device *dev, int mask);
  52 static int com20020_reset(struct net_device *dev, int really_reset);
  53 static void com20020_copy_to_card(struct net_device *dev, int bufnum,
  54                                   int offset, void *buf, int count);
  55 static void com20020_copy_from_card(struct net_device *dev, int bufnum,
  56                                     int offset, void *buf, int count);
  57 static void com20020_set_mc_list(struct net_device *dev);
  58 static void com20020_close(struct net_device *);
  59
  60 static void com20020_copy_from_card(struct net_device *dev, int bufnum,
  61                                     int offset, void *buf, int count)
  62 {
  63         int ioaddr = dev->base_addr, ofs = 512 * bufnum + offset;
  64
  65         /* set up the address register */
  66         outb((ofs >> 8) | RDDATAflag | AUTOINCflag, _ADDR_HI);
  67         outb(ofs & 0xff, _ADDR_LO);
  68
  69         /* copy the data */
  70         TIME("insb", count, insb(_MEMDATA, buf, count));
  71 }
  72
  73
  74 static void com20020_copy_to_card(struct net_device *dev, int bufnum,
  75                                   int offset, void *buf, int count)
  76 {
  77         int ioaddr = dev->base_addr, ofs = 512 * bufnum + offset;
  78
  79         /* set up the address register */
  80         outb((ofs >> 8) | AUTOINCflag, _ADDR_HI);
  81         outb(ofs & 0xff, _ADDR_LO);
  82
  83         /* copy the data */
  84         TIME("outsb", count, outsb(_MEMDATA, buf, count));
  85 }
  86
  87
  88 /* Reset the card and check some basic stuff during the detection stage. */
  89 int com20020_check(struct net_device *dev)
  90 {
  91         int ioaddr = dev->base_addr, status;
  92         struct arcnet_local *lp = dev->priv;
  93
  94         ARCRESET0;
  95         mdelay(RESETtime);
  96
  97         lp->setup = lp->clockm ? 0 : (lp->clockp << 1);
  98         lp->setup2 = (lp->clockm << 4) | 8;
  99
 100         /* CHECK: should we do this for SOHARD cards ? */
 101         /* Enable P1Mode for backplane mode */
 102         lp->setup = lp->setup | P1MODE;
 103
 104         SET_SUBADR(SUB_SETUP1);
 105         outb(lp->setup, _XREG);
 106
 107         if (lp->clockm != 0)
 108         {
 109                 SET_SUBADR(SUB_SETUP2);
 110                 outb(lp->setup2, _XREG);
 111
 112                 /* must now write the magic "restart operation" command */
 113                 mdelay(1);
 114                 outb(0x18, _COMMAND);
 115         }
 116
 117         lp->config = 0x21 | (lp->timeout << 3) | (lp->backplane << 2);
 118         /* set node ID to 0x42 (but transmitter is disabled, so it's okay) */
 119         SETCONF;
 120         outb(0x42, ioaddr + BUS_ALIGN*7);
 121
 122         status = ASTATUS();
 123
 124         if ((status & 0x99) != (NORXflag | TXFREEflag | RESETflag)) {
 125                 BUGMSG(D_NORMAL, "status invalid (%Xh).\n", status);
 126                 return -ENODEV;
 127         }
 128         BUGMSG(D_INIT_REASONS, "status after reset: %X\n", status);
 129
 130         /* Enable TX */
 131         outb(0x39, _CONFIG);
 132         outb(inb(ioaddr + BUS_ALIGN*8), ioaddr + BUS_ALIGN*7);
 133
 134         ACOMMAND(CFLAGScmd | RESETclear | CONFIGclear);
 135
 136         status = ASTATUS();
 137         BUGMSG(D_INIT_REASONS, "status after reset acknowledged: %X\n",
 138                status);
 139
 140         /* Read first location of memory */
 141         outb(0 | RDDATAflag | AUTOINCflag, _ADDR_HI);
 142         outb(0, _ADDR_LO);
 143
 144         if ((status = inb(_MEMDATA)) != TESTvalue) {
 145                 BUGMSG(D_NORMAL, "Signature byte not found (%02Xh != D1h).\n",
 146                        status);
 147                 return -ENODEV;
 148         }
 149         return 0;
 150 }
 151
 152 /* Set up the struct net_device associated with this card.  Called after
 153  * probing succeeds.
 154  */
 155 int com20020_found(struct net_device *dev, int shared)
 156 {
 157         struct arcnet_local *lp;
 158         int ioaddr = dev->base_addr;
 159
 160         /* Initialize the rest of the device structure. */
 161
 162         lp = dev->priv;
 163
 164         lp->hw.owner = THIS_MODULE;
 165         lp->hw.command = com20020_command;
 166         lp->hw.status = com20020_status;
 167         lp->hw.intmask = com20020_setmask;
 168         lp->hw.reset = com20020_reset;
 169         lp->hw.copy_to_card = com20020_copy_to_card;
 170         lp->hw.copy_from_card = com20020_copy_from_card;
 171         lp->hw.close = com20020_close;
 172
 173         dev->set_multicast_list = com20020_set_mc_list;
 174
 175         if (!dev->dev_addr[0])
 176                 dev->dev_addr[0] = inb(ioaddr + BUS_ALIGN*8);   /* FIXME: do this some other way! */
 177
 178         SET_SUBADR(SUB_SETUP1);
 179         outb(lp->setup, _XREG);
 180
 181         if (lp->card_flags & ARC_CAN_10MBIT)
 182         {
 183                 SET_SUBADR(SUB_SETUP2);
 184                 outb(lp->setup2, _XREG);
 185
 186                 /* must now write the magic "restart operation" command */
 187                 mdelay(1);
 188                 outb(0x18, _COMMAND);
 189         }
 190
 191         lp->config = 0x20 | (lp->timeout << 3) | (lp->backplane << 2) | 1;
 192         /* Default 0x38 + register: Node ID */
 193         SETCONF;
 194         outb(dev->dev_addr[0], _XREG);
 195
 196         /* reserve the irq */
 197         if (request_irq(dev->irq, &arcnet_interrupt, shared,
 198                         "arcnet (COM20020)", dev)) {
 199                 BUGMSG(D_NORMAL, "Can't get IRQ %d!\n", dev->irq);
 200                 return -ENODEV;
 201         }
 202
 203         dev->base_addr = ioaddr;
 204
 205         BUGMSG(D_NORMAL, "%s: station %02Xh found at %03lXh, IRQ %d.\n",
 206                lp->card_name, dev->dev_addr[0], dev->base_addr, dev->irq);
 207
 208         if (lp->backplane)
 209                 BUGMSG(D_NORMAL, "Using backplane mode.\n");
 210
 211         if (lp->timeout != 3)
 212                 BUGMSG(D_NORMAL, "Using extended timeout value of %d.\n", lp->timeout);
 213
 214         BUGMSG(D_NORMAL, "Using CKP %d - data rate %s.\n",
 215                lp->setup >> 1,
 216                clockrates[3 - ((lp->setup2 & 0xF0) >> 4) + ((lp->setup & 0x0F) >> 1)]);
 217
 218         if (register_netdev(dev)) {
 219                 free_irq(dev->irq, dev);
 220                 return -EIO;
 221         }
 222         return 0;
 223 }
 224
 225
 226 /*
 227  * Do a hardware reset on the card, and set up necessary registers.
 228  *
 229  * This should be called as little as possible, because it disrupts the
 230  * token on the network (causes a RECON) and requires a significant delay.
 231  *
 232  * However, it does make sure the card is in a defined state.
 233  */
 234 static int com20020_reset(struct net_device *dev, int really_reset)
 235 {
 236         struct arcnet_local *lp = dev->priv;
 237         u_int ioaddr = dev->base_addr;
 238         u_char inbyte;
 239
 240         BUGMSG(D_DEBUG, "%s: %d: %s: dev: %p, lp: %p, dev->name: %s\n",
 241                 __FILE__,__LINE__,__FUNCTION__,dev,lp,dev->name);
 242         BUGMSG(D_INIT, "Resetting %s (status=%02Xh)\n",
 243                dev->name, ASTATUS());
 244
 245         BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
 246         lp->config = TXENcfg | (lp->timeout << 3) | (lp->backplane << 2);
 247         /* power-up defaults */
 248         SETCONF;
 249         BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
 250
 251         if (really_reset) {
 252                 /* reset the card */
 253                 ARCRESET;
 254                 mdelay(RESETtime * 2);  /* COM20020 seems to be slower sometimes */
 255         }
 256         /* clear flags & end reset */
 257         BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
 258         ACOMMAND(CFLAGScmd | RESETclear | CONFIGclear);
 259
 260         /* verify that the ARCnet signature byte is present */
 261         BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
 262
 263         com20020_copy_from_card(dev, 0, 0, &inbyte, 1);
 264         BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
 265         if (inbyte != TESTvalue) {
 266                 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
 267                 BUGMSG(D_NORMAL, "reset failed: TESTvalue not present.\n");
 268                 return 1;
 269         }
 270         /* enable extended (512-byte) packets */
 271         ACOMMAND(CONFIGcmd | EXTconf);
 272         BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
 273
 274         /* done!  return success. */
 275         return 0;
 276 }
 277
 278
 279 static void com20020_setmask(struct net_device *dev, int mask)
 280 {
 281         u_int ioaddr = dev->base_addr;
 282         BUGMSG(D_DURING, "Setting mask to %x at %x\n",mask,ioaddr);
 283         AINTMASK(mask);
 284 }
 285
 286
 287 static void com20020_command(struct net_device *dev, int cmd)
 288 {
 289         u_int ioaddr = dev->base_addr;
 290         ACOMMAND(cmd);
 291 }
 292
 293
 294 static int com20020_status(struct net_device *dev)
 295 {
 296         u_int ioaddr = dev->base_addr;
 297
 298         return ASTATUS() + (ADIAGSTATUS()<<8);
 299 }
 300
 301 static void com20020_close(struct net_device *dev)
 302 {
 303         struct arcnet_local *lp = dev->priv;
 304         int ioaddr = dev->base_addr;
 305
 306         /* disable transmitter */
 307         lp->config &= ~TXENcfg;
 308         SETCONF;
 309 }
 310
 311 /* Set or clear the multicast filter for this adaptor.
 312  * num_addrs == -1    Promiscuous mode, receive all packets
 313  * num_addrs == 0       Normal mode, clear multicast list
 314  * num_addrs > 0        Multicast mode, receive normal and MC packets, and do
 315  *                      best-effort filtering.
 316  *      FIXME - do multicast stuff, not just promiscuous.
 317  */
 318 static void com20020_set_mc_list(struct net_device *dev)
 319 {
 320         struct arcnet_local *lp = dev->priv;
 321         int ioaddr = dev->base_addr;
 322
 323         if ((dev->flags & IFF_PROMISC) && (dev->flags & IFF_UP)) {      /* Enable promiscuous mode */
 324                 if (!(lp->setup & PROMISCset))
 325                         BUGMSG(D_NORMAL, "Setting promiscuous flag...\n");
 326                 SET_SUBADR(SUB_SETUP1);
 327                 lp->setup |= PROMISCset;
 328                 outb(lp->setup, _XREG);
 329         } else
 330                 /* Disable promiscuous mode, use normal mode */
 331         {
 332                 if ((lp->setup & PROMISCset))
 333                         BUGMSG(D_NORMAL, "Resetting promiscuous flag...\n");
 334                 SET_SUBADR(SUB_SETUP1);
 335                 lp->setup &= ~PROMISCset;
 336                 outb(lp->setup, _XREG);
 337         }
 338 }
 339
 340 #if defined(CONFIG_ARCNET_COM20020_PCI_MODULE) || \
 341     defined(CONFIG_ARCNET_COM20020_ISA_MODULE) || \
 342     defined(CONFIG_ARCNET_COM20020_CS_MODULE)
 343 EXPORT_SYMBOL(com20020_check);
 344 EXPORT_SYMBOL(com20020_found);
 345 #endif
 346
 347 MODULE_LICENSE("GPL");
 348
 349 #ifdef MODULE
 350
 351 int init_module(void)
 352 {
 353         BUGLVL(D_NORMAL) printk(VERSION);
 354         return 0;
 355 }
 356
 357 void cleanup_module(void)
 358 {
 359 }
 360
 361 #endif                          /* MODULE */