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/errno.h>
  33 #include <linux/delay.h>
  34 #include <linux/netdevice.h>
  35 #include <linux/init.h>
  36 #include <linux/arcdevice.h>
  37 #include <linux/com20020.h>
  38
  39 #include <asm/io.h>
  40
  41 #define VERSION "arcnet: COM20020 chipset support (by David Woodhouse et al.)\n"
  42
  43 static char *clockrates[] =
  44 {"10 Mb/s", "Reserved", "5 Mb/s",
  45  "2.5 Mb/s", "1.25Mb/s", "625 Kb/s", "312.5 Kb/s",
  46  "156.25 Kb/s", "Reserved", "Reserved", "Reserved"};
  47
  48 static void com20020_command(struct net_device *dev, int command);
  49 static int com20020_status(struct net_device *dev);
  50 static void com20020_setmask(struct net_device *dev, int mask);
  51 static int com20020_reset(struct net_device *dev, int really_reset);
  52 static void com20020_copy_to_card(struct net_device *dev, int bufnum,
  53                                   int offset, void *buf, int count);
  54 static void com20020_copy_from_card(struct net_device *dev, int bufnum,
  55                                     int offset, void *buf, int count);
  56 static void com20020_set_mc_list(struct net_device *dev);
  57 static void com20020_close(struct net_device *);
  58
  59 static void com20020_copy_from_card(struct net_device *dev, int bufnum,
  60                                     int offset, void *buf, int count)
  61 {
  62         int ioaddr = dev->base_addr, ofs = 512 * bufnum + offset;
  63
  64         /* set up the address register */
  65         outb((ofs >> 8) | RDDATAflag | AUTOINCflag, _ADDR_HI);
  66         outb(ofs & 0xff, _ADDR_LO);
  67
  68         /* copy the data */
  69         TIME("insb", count, insb(_MEMDATA, buf, count));
  70 }
  71
  72
  73 static void com20020_copy_to_card(struct net_device *dev, int bufnum,
  74                                   int offset, void *buf, int count)
  75 {
  76         int ioaddr = dev->base_addr, ofs = 512 * bufnum + offset;
  77
  78         /* set up the address register */
  79         outb((ofs >> 8) | AUTOINCflag, _ADDR_HI);
  80         outb(ofs & 0xff, _ADDR_LO);
  81
  82         /* copy the data */
  83         TIME("outsb", count, outsb(_MEMDATA, buf, count));
  84 }
  85
  86
  87 /* Reset the card and check some basic stuff during the detection stage. */
  88 int com20020_check(struct net_device *dev)
  89 {
  90         int ioaddr = dev->base_addr, status;
  91         struct arcnet_local *lp = netdev_priv(dev);
  92
  93         ARCRESET0;
  94         mdelay(RESETtime);
  95
  96         lp->setup = lp->clockm ? 0 : (lp->clockp << 1);
  97         lp->setup2 = (lp->clockm << 4) | 8;
  98
  99         /* CHECK: should we do this for SOHARD cards ? */
 100         /* Enable P1Mode for backplane mode */
 101         lp->setup = lp->setup | P1MODE;
 102
 103         SET_SUBADR(SUB_SETUP1);
 104         outb(lp->setup, _XREG);
 105
 106         if (lp->clockm != 0)
 107         {
 108                 SET_SUBADR(SUB_SETUP2);
 109                 outb(lp->setup2, _XREG);
 110
 111                 /* must now write the magic "restart operation" command */
 112                 mdelay(1);
 113                 outb(0x18, _COMMAND);
 114         }
 115
 116         lp->config = 0x21 | (lp->timeout << 3) | (lp->backplane << 2);
 117         /* set node ID to 0x42 (but transmitter is disabled, so it's okay) */
 118         SETCONF;
 119         outb(0x42, ioaddr + BUS_ALIGN*7);
 120
 121         status = ASTATUS();
 122
 123         if ((status & 0x99) != (NORXflag | TXFREEflag | RESETflag)) {
 124                 BUGMSG(D_NORMAL, "status invalid (%Xh).\n", status);
 125                 return -ENODEV;
 126         }
 127         BUGMSG(D_INIT_REASONS, "status after reset: %X\n", status);
 128
 129         /* Enable TX */
 130         outb(0x39, _CONFIG);
 131         outb(inb(ioaddr + BUS_ALIGN*8), ioaddr + BUS_ALIGN*7);
 132
 133         ACOMMAND(CFLAGScmd | RESETclear | CONFIGclear);
 134
 135         status = ASTATUS();
 136         BUGMSG(D_INIT_REASONS, "status after reset acknowledged: %X\n",
 137                status);
 138
 139         /* Read first location of memory */
 140         outb(0 | RDDATAflag | AUTOINCflag, _ADDR_HI);
 141         outb(0, _ADDR_LO);
 142
 143         if ((status = inb(_MEMDATA)) != TESTvalue) {
 144                 BUGMSG(D_NORMAL, "Signature byte not found (%02Xh != D1h).\n",
 145                        status);
 146                 return -ENODEV;
 147         }
 148         return 0;
 149 }
 150
 151 const struct net_device_ops com20020_netdev_ops = {
 152         .ndo_open       = arcnet_open,
 153         .ndo_stop       = arcnet_close,
 154         .ndo_start_xmit = arcnet_send_packet,
 155         .ndo_tx_timeout = arcnet_timeout,
 156         .ndo_set_multicast_list = com20020_set_mc_list,
 157 };
 158
 159 /* Set up the struct net_device associated with this card.  Called after
 160  * probing succeeds.
 161  */
 162 int com20020_found(struct net_device *dev, int shared)
 163 {
 164         struct arcnet_local *lp;
 165         int ioaddr = dev->base_addr;
 166
 167         /* Initialize the rest of the device structure. */
 168
 169         lp = netdev_priv(dev);
 170
 171         lp->hw.owner = THIS_MODULE;
 172         lp->hw.command = com20020_command;
 173         lp->hw.status = com20020_status;
 174         lp->hw.intmask = com20020_setmask;
 175         lp->hw.reset = com20020_reset;
 176         lp->hw.copy_to_card = com20020_copy_to_card;
 177         lp->hw.copy_from_card = com20020_copy_from_card;
 178         lp->hw.close = com20020_close;
 179
 180         if (!dev->dev_addr[0])
 181                 dev->dev_addr[0] = inb(ioaddr + BUS_ALIGN*8);   /* FIXME: do this some other way! */
 182
 183         SET_SUBADR(SUB_SETUP1);
 184         outb(lp->setup, _XREG);
 185
 186         if (lp->card_flags & ARC_CAN_10MBIT)
 187         {
 188                 SET_SUBADR(SUB_SETUP2);
 189                 outb(lp->setup2, _XREG);
 190
 191                 /* must now write the magic "restart operation" command */
 192                 mdelay(1);
 193                 outb(0x18, _COMMAND);
 194         }
 195
 196         lp->config = 0x20 | (lp->timeout << 3) | (lp->backplane << 2) | 1;
 197         /* Default 0x38 + register: Node ID */
 198         SETCONF;
 199         outb(dev->dev_addr[0], _XREG);
 200
 201         /* reserve the irq */
 202         if (request_irq(dev->irq, arcnet_interrupt, shared,
 203                         "arcnet (COM20020)", dev)) {
 204                 BUGMSG(D_NORMAL, "Can't get IRQ %d!\n", dev->irq);
 205                 return -ENODEV;
 206         }
 207
 208         dev->base_addr = ioaddr;
 209
 210         BUGMSG(D_NORMAL, "%s: station %02Xh found at %03lXh, IRQ %d.\n",
 211                lp->card_name, dev->dev_addr[0], dev->base_addr, dev->irq);
 212
 213         if (lp->backplane)
 214                 BUGMSG(D_NORMAL, "Using backplane mode.\n");
 215
 216         if (lp->timeout != 3)
 217                 BUGMSG(D_NORMAL, "Using extended timeout value of %d.\n", lp->timeout);
 218
 219         BUGMSG(D_NORMAL, "Using CKP %d - data rate %s.\n",
 220                lp->setup >> 1,
 221                clockrates[3 - ((lp->setup2 & 0xF0) >> 4) + ((lp->setup & 0x0F) >> 1)]);
 222
 223         if (register_netdev(dev)) {
 224                 free_irq(dev->irq, dev);
 225                 return -EIO;
 226         }
 227         return 0;
 228 }
 229
 230
 231 /*
 232  * Do a hardware reset on the card, and set up necessary registers.
 233  *
 234  * This should be called as little as possible, because it disrupts the
 235  * token on the network (causes a RECON) and requires a significant delay.
 236  *
 237  * However, it does make sure the card is in a defined state.
 238  */
 239 static int com20020_reset(struct net_device *dev, int really_reset)
 240 {
 241         struct arcnet_local *lp = netdev_priv(dev);
 242         u_int ioaddr = dev->base_addr;
 243         u_char inbyte;
 244
 245         BUGMSG(D_DEBUG, "%s: %d: %s: dev: %p, lp: %p, dev->name: %s\n",
 246                 __FILE__,__LINE__,__func__,dev,lp,dev->name);
 247         BUGMSG(D_INIT, "Resetting %s (status=%02Xh)\n",
 248                dev->name, ASTATUS());
 249
 250         BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
 251         lp->config = TXENcfg | (lp->timeout << 3) | (lp->backplane << 2);
 252         /* power-up defaults */
 253         SETCONF;
 254         BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
 255
 256         if (really_reset) {
 257                 /* reset the card */
 258                 ARCRESET;
 259                 mdelay(RESETtime * 2);  /* COM20020 seems to be slower sometimes */
 260         }
 261         /* clear flags & end reset */
 262         BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
 263         ACOMMAND(CFLAGScmd | RESETclear | CONFIGclear);
 264
 265         /* verify that the ARCnet signature byte is present */
 266         BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
 267
 268         com20020_copy_from_card(dev, 0, 0, &inbyte, 1);
 269         BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
 270         if (inbyte != TESTvalue) {
 271                 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
 272                 BUGMSG(D_NORMAL, "reset failed: TESTvalue not present.\n");
 273                 return 1;
 274         }
 275         /* enable extended (512-byte) packets */
 276         ACOMMAND(CONFIGcmd | EXTconf);
 277         BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
 278
 279         /* done!  return success. */
 280         return 0;
 281 }
 282
 283
 284 static void com20020_setmask(struct net_device *dev, int mask)
 285 {
 286         u_int ioaddr = dev->base_addr;
 287         BUGMSG(D_DURING, "Setting mask to %x at %x\n",mask,ioaddr);
 288         AINTMASK(mask);
 289 }
 290
 291
 292 static void com20020_command(struct net_device *dev, int cmd)
 293 {
 294         u_int ioaddr = dev->base_addr;
 295         ACOMMAND(cmd);
 296 }
 297
 298
 299 static int com20020_status(struct net_device *dev)
 300 {
 301         u_int ioaddr = dev->base_addr;
 302
 303         return ASTATUS() + (ADIAGSTATUS()<<8);
 304 }
 305
 306 static void com20020_close(struct net_device *dev)
 307 {
 308         struct arcnet_local *lp = netdev_priv(dev);
 309         int ioaddr = dev->base_addr;
 310
 311         /* disable transmitter */
 312         lp->config &= ~TXENcfg;
 313         SETCONF;
 314 }
 315
 316 /* Set or clear the multicast filter for this adaptor.
 317  * num_addrs == -1    Promiscuous mode, receive all packets
 318  * num_addrs == 0       Normal mode, clear multicast list
 319  * num_addrs > 0        Multicast mode, receive normal and MC packets, and do
 320  *                      best-effort filtering.
 321  *      FIXME - do multicast stuff, not just promiscuous.
 322  */
 323 static void com20020_set_mc_list(struct net_device *dev)
 324 {
 325         struct arcnet_local *lp = netdev_priv(dev);
 326         int ioaddr = dev->base_addr;
 327
 328         if ((dev->flags & IFF_PROMISC) && (dev->flags & IFF_UP)) {      /* Enable promiscuous mode */
 329                 if (!(lp->setup & PROMISCset))
 330                         BUGMSG(D_NORMAL, "Setting promiscuous flag...\n");
 331                 SET_SUBADR(SUB_SETUP1);
 332                 lp->setup |= PROMISCset;
 333                 outb(lp->setup, _XREG);
 334         } else
 335                 /* Disable promiscuous mode, use normal mode */
 336         {
 337                 if ((lp->setup & PROMISCset))
 338                         BUGMSG(D_NORMAL, "Resetting promiscuous flag...\n");
 339                 SET_SUBADR(SUB_SETUP1);
 340                 lp->setup &= ~PROMISCset;
 341                 outb(lp->setup, _XREG);
 342         }
 343 }
 344
 345 #if defined(CONFIG_ARCNET_COM20020_PCI_MODULE) || \
 346     defined(CONFIG_ARCNET_COM20020_ISA_MODULE) || \
 347     defined(CONFIG_ARCNET_COM20020_CS_MODULE)
 348 EXPORT_SYMBOL(com20020_check);
 349 EXPORT_SYMBOL(com20020_found);
 350 EXPORT_SYMBOL(com20020_netdev_ops);
 351 #endif
 352
 353 MODULE_LICENSE("GPL");
 354
 355 #ifdef MODULE
 356
 357 static int __init com20020_module_init(void)
 358 {
 359         BUGLVL(D_NORMAL) printk(VERSION);
 360         return 0;
 361 }
 362
 363 static void __exit com20020_module_exit(void)
 364 {
 365 }
 366 module_init(com20020_module_init);
 367 module_exit(com20020_module_exit);
 368 #endif                          /* MODULE */