drivers/net/arcnet/com90io.c

   1 /*
   2  * Linux ARCnet driver - COM90xx chipset (IO-mapped buffers)
   3  *
   4  * Written 1997 by David Woodhouse.
   5  * Written 1994-1999 by Avery Pennarun.
   6  * Written 1999-2000 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/kernel.h>
  29 #include <linux/module.h>
  30 #include <linux/moduleparam.h>
  31 #include <linux/ioport.h>
  32 #include <linux/slab.h>
  33 #include <linux/delay.h>
  34 #include <linux/netdevice.h>
  35 #include <linux/bootmem.h>
  36 #include <linux/init.h>
  37 #include <asm/io.h>
  38 #include <linux/arcdevice.h>
  39
  40
  41 #define VERSION "arcnet: COM90xx IO-mapped mode support (by David Woodhouse et el.)\n"
  42
  43
  44 /* Internal function declarations */
  45
  46 static int com90io_found(struct net_device *dev);
  47 static void com90io_command(struct net_device *dev, int command);
  48 static int com90io_status(struct net_device *dev);
  49 static void com90io_setmask(struct net_device *dev, int mask);
  50 static int com90io_reset(struct net_device *dev, int really_reset);
  51 static void com90io_copy_to_card(struct net_device *dev, int bufnum, int offset,
  52                                  void *buf, int count);
  53 static void com90io_copy_from_card(struct net_device *dev, int bufnum, int offset,
  54                                    void *buf, int count);
  55
  56
  57 /* Handy defines for ARCnet specific stuff */
  58
  59 /* The number of low I/O ports used by the card. */
  60 #define ARCNET_TOTAL_SIZE 16
  61
  62 /* COM 9026 controller chip --> ARCnet register addresses */
  63 #define _INTMASK (ioaddr+0)     /* writable */
  64 #define _STATUS  (ioaddr+0)     /* readable */
  65 #define _COMMAND (ioaddr+1)     /* writable, returns random vals on read (?) */
  66 #define _RESET  (ioaddr+8)      /* software reset (on read) */
  67 #define _MEMDATA  (ioaddr+12)   /* Data port for IO-mapped memory */
  68 #define _ADDR_HI  (ioaddr+15)   /* Control registers for said */
  69 #define _ADDR_LO  (ioaddr+14)
  70 #define _CONFIG  (ioaddr+2)     /* Configuration register */
  71
  72 #undef ASTATUS
  73 #undef ACOMMAND
  74 #undef AINTMASK
  75
  76 #define ASTATUS()       inb(_STATUS)
  77 #define ACOMMAND(cmd) outb((cmd),_COMMAND)
  78 #define AINTMASK(msk)   outb((msk),_INTMASK)
  79 #define SETCONF()       outb((lp->config),_CONFIG)
  80
  81
  82 /****************************************************************************
  83  *                                                                          *
  84  * IO-mapped operation routines                                             *
  85  *                                                                          *
  86  ****************************************************************************/
  87
  88 #undef ONE_AT_A_TIME_TX
  89 #undef ONE_AT_A_TIME_RX
  90
  91 static u_char get_buffer_byte(struct net_device *dev, unsigned offset)
  92 {
  93         int ioaddr = dev->base_addr;
  94
  95         outb(offset >> 8, _ADDR_HI);
  96         outb(offset & 0xff, _ADDR_LO);
  97
  98         return inb(_MEMDATA);
  99 }
 100
 101 #ifdef ONE_AT_A_TIME_TX
 102 static void put_buffer_byte(struct net_device *dev, unsigned offset, u_char datum)
 103 {
 104         int ioaddr = dev->base_addr;
 105
 106         outb(offset >> 8, _ADDR_HI);
 107         outb(offset & 0xff, _ADDR_LO);
 108
 109         outb(datum, _MEMDATA);
 110 }
 111
 112 #endif
 113
 114
 115 static void get_whole_buffer(struct net_device *dev, unsigned offset, unsigned length, char *dest)
 116 {
 117         int ioaddr = dev->base_addr;
 118
 119         outb((offset >> 8) | AUTOINCflag, _ADDR_HI);
 120         outb(offset & 0xff, _ADDR_LO);
 121
 122         while (length--)
 123 #ifdef ONE_AT_A_TIME_RX
 124                 *(dest++) = get_buffer_byte(dev, offset++);
 125 #else
 126                 *(dest++) = inb(_MEMDATA);
 127 #endif
 128 }
 129
 130 static void put_whole_buffer(struct net_device *dev, unsigned offset, unsigned length, char *dest)
 131 {
 132         int ioaddr = dev->base_addr;
 133
 134         outb((offset >> 8) | AUTOINCflag, _ADDR_HI);
 135         outb(offset & 0xff, _ADDR_LO);
 136
 137         while (length--)
 138 #ifdef ONE_AT_A_TIME_TX
 139                 put_buffer_byte(dev, offset++, *(dest++));
 140 #else
 141                 outb(*(dest++), _MEMDATA);
 142 #endif
 143 }
 144
 145 /*
 146  * We cannot probe for an IO mapped card either, although we can check that
 147  * it's where we were told it was, and even autoirq
 148  */
 149 static int __init com90io_probe(struct net_device *dev)
 150 {
 151         int ioaddr = dev->base_addr, status;
 152         unsigned long airqmask;
 153
 154         BUGLVL(D_NORMAL) printk(VERSION);
 155         BUGLVL(D_NORMAL) printk("E-mail me if you actually test this driver, please!\n");
 156
 157         if (!ioaddr) {
 158                 BUGMSG(D_NORMAL, "No autoprobe for IO mapped cards; you "
 159                        "must specify the base address!\n");
 160                 return -ENODEV;
 161         }
 162         if (!request_region(ioaddr, ARCNET_TOTAL_SIZE, "com90io probe")) {
 163                 BUGMSG(D_INIT_REASONS, "IO check_region %x-%x failed.\n",
 164                        ioaddr, ioaddr + ARCNET_TOTAL_SIZE - 1);
 165                 return -ENXIO;
 166         }
 167         if (ASTATUS() == 0xFF) {
 168                 BUGMSG(D_INIT_REASONS, "IO address %x empty\n", ioaddr);
 169                 goto err_out;
 170         }
 171         inb(_RESET);
 172         mdelay(RESETtime);
 173
 174         status = ASTATUS();
 175
 176         if ((status & 0x9D) != (NORXflag | RECONflag | TXFREEflag | RESETflag)) {
 177                 BUGMSG(D_INIT_REASONS, "Status invalid (%Xh).\n", status);
 178                 goto err_out;
 179         }
 180         BUGMSG(D_INIT_REASONS, "Status after reset: %X\n", status);
 181
 182         ACOMMAND(CFLAGScmd | RESETclear | CONFIGclear);
 183
 184         BUGMSG(D_INIT_REASONS, "Status after reset acknowledged: %X\n", status);
 185
 186         status = ASTATUS();
 187
 188         if (status & RESETflag) {
 189                 BUGMSG(D_INIT_REASONS, "Eternal reset (status=%Xh)\n", status);
 190                 goto err_out;
 191         }
 192         outb((0x16 | IOMAPflag) & ~ENABLE16flag, _CONFIG);
 193
 194         /* Read first loc'n of memory */
 195
 196         outb(AUTOINCflag, _ADDR_HI);
 197         outb(0, _ADDR_LO);
 198
 199         if ((status = inb(_MEMDATA)) != 0xd1) {
 200                 BUGMSG(D_INIT_REASONS, "Signature byte not found"
 201                        " (%Xh instead).\n", status);
 202                 goto err_out;
 203         }
 204         if (!dev->irq) {
 205                 /*
 206                  * if we do this, we're sure to get an IRQ since the
 207                  * card has just reset and the NORXflag is on until
 208                  * we tell it to start receiving.
 209                  */
 210
 211                 airqmask = probe_irq_on();
 212                 outb(NORXflag, _INTMASK);
 213                 udelay(1);
 214                 outb(0, _INTMASK);
 215                 dev->irq = probe_irq_off(airqmask);
 216
 217                 if (dev->irq <= 0) {
 218                         BUGMSG(D_INIT_REASONS, "Autoprobe IRQ failed\n");
 219                         goto err_out;
 220                 }
 221         }
 222         release_region(ioaddr, ARCNET_TOTAL_SIZE); /* end of probing */
 223         return com90io_found(dev);
 224
 225 err_out:
 226         release_region(ioaddr, ARCNET_TOTAL_SIZE);
 227         return -ENODEV;
 228 }
 229
 230
 231 /* Set up the struct net_device associated with this card.  Called after
 232  * probing succeeds.
 233  */
 234 static int __init com90io_found(struct net_device *dev)
 235 {
 236         struct arcnet_local *lp;
 237         int ioaddr = dev->base_addr;
 238         int err;
 239
 240         /* Reserve the irq */
 241         if (request_irq(dev->irq, &arcnet_interrupt, 0, "arcnet (COM90xx-IO)", dev)) {
 242                 BUGMSG(D_NORMAL, "Can't get IRQ %d!\n", dev->irq);
 243                 return -ENODEV;
 244         }
 245         /* Reserve the I/O region - guaranteed to work by check_region */
 246         if (!request_region(dev->base_addr, ARCNET_TOTAL_SIZE, "arcnet (COM90xx-IO)")) {
 247                 free_irq(dev->irq, dev);
 248                 return -EBUSY;
 249         }
 250
 251         lp = dev->priv;
 252         lp->card_name = "COM90xx I/O";
 253         lp->hw.command = com90io_command;
 254         lp->hw.status = com90io_status;
 255         lp->hw.intmask = com90io_setmask;
 256         lp->hw.reset = com90io_reset;
 257         lp->hw.owner = THIS_MODULE;
 258         lp->hw.copy_to_card = com90io_copy_to_card;
 259         lp->hw.copy_from_card = com90io_copy_from_card;
 260
 261         lp->config = (0x16 | IOMAPflag) & ~ENABLE16flag;
 262         SETCONF();
 263
 264         /* get and check the station ID from offset 1 in shmem */
 265
 266         dev->dev_addr[0] = get_buffer_byte(dev, 1);
 267
 268         err = register_netdev(dev);
 269         if (err) {
 270                 outb((inb(_CONFIG) & ~IOMAPflag), _CONFIG);
 271                 free_irq(dev->irq, dev);
 272                 release_region(dev->base_addr, ARCNET_TOTAL_SIZE);
 273                 return err;
 274         }
 275
 276         BUGMSG(D_NORMAL, "COM90IO: station %02Xh found at %03lXh, IRQ %d.\n",
 277                dev->dev_addr[0], dev->base_addr, dev->irq);
 278
 279         return 0;
 280 }
 281
 282
 283 /*
 284  * Do a hardware reset on the card, and set up necessary registers.
 285  *
 286  * This should be called as little as possible, because it disrupts the
 287  * token on the network (causes a RECON) and requires a significant delay.
 288  *
 289  * However, it does make sure the card is in a defined state.
 290  */
 291 static int com90io_reset(struct net_device *dev, int really_reset)
 292 {
 293         struct arcnet_local *lp = dev->priv;
 294         short ioaddr = dev->base_addr;
 295
 296         BUGMSG(D_INIT, "Resetting %s (status=%02Xh)\n", dev->name, ASTATUS());
 297
 298         if (really_reset) {
 299                 /* reset the card */
 300                 inb(_RESET);
 301                 mdelay(RESETtime);
 302         }
 303         /* Set the thing to IO-mapped, 8-bit  mode */
 304         lp->config = (0x1C | IOMAPflag) & ~ENABLE16flag;
 305         SETCONF();
 306
 307         ACOMMAND(CFLAGScmd | RESETclear);       /* clear flags & end reset */
 308         ACOMMAND(CFLAGScmd | CONFIGclear);
 309
 310         /* verify that the ARCnet signature byte is present */
 311         if (get_buffer_byte(dev, 0) != TESTvalue) {
 312                 BUGMSG(D_NORMAL, "reset failed: TESTvalue not present.\n");
 313                 return 1;
 314         }
 315         /* enable extended (512-byte) packets */
 316         ACOMMAND(CONFIGcmd | EXTconf);
 317
 318         /* done!  return success. */
 319         return 0;
 320 }
 321
 322
 323 static void com90io_command(struct net_device *dev, int cmd)
 324 {
 325         short ioaddr = dev->base_addr;
 326
 327         ACOMMAND(cmd);
 328 }
 329
 330
 331 static int com90io_status(struct net_device *dev)
 332 {
 333         short ioaddr = dev->base_addr;
 334
 335         return ASTATUS();
 336 }
 337
 338
 339 static void com90io_setmask(struct net_device *dev, int mask)
 340 {
 341         short ioaddr = dev->base_addr;
 342
 343         AINTMASK(mask);
 344 }
 345
 346 static void com90io_copy_to_card(struct net_device *dev, int bufnum, int offset,
 347                                  void *buf, int count)
 348 {
 349         TIME("put_whole_buffer", count, put_whole_buffer(dev, bufnum * 512 + offset, count, buf));
 350 }
 351
 352
 353 static void com90io_copy_from_card(struct net_device *dev, int bufnum, int offset,
 354                                    void *buf, int count)
 355 {
 356         TIME("get_whole_buffer", count, get_whole_buffer(dev, bufnum * 512 + offset, count, buf));
 357 }
 358
 359 static int io;                  /* use the insmod io= irq= shmem= options */
 360 static int irq;
 361 static char device[9];          /* use eg. device=arc1 to change name */
 362
 363 module_param(io, int, 0);
 364 module_param(irq, int, 0);
 365 module_param_string(device, device, sizeof(device), 0);
 366 MODULE_LICENSE("GPL");
 367
 368 #ifndef MODULE
 369 static int __init com90io_setup(char *s)
 370 {
 371         int ints[4];
 372         s = get_options(s, 4, ints);
 373         if (!ints[0])
 374                 return 0;
 375         switch (ints[0]) {
 376         default:                /* ERROR */
 377                 printk("com90io: Too many arguments.\n");
 378         case 2:         /* IRQ */
 379                 irq = ints[2];
 380         case 1:         /* IO address */
 381                 io = ints[1];
 382         }
 383         if (*s)
 384                 snprintf(device, sizeof(device), "%s", s);
 385         return 1;
 386 }
 387 __setup("com90io=", com90io_setup);
 388 #endif
 389
 390 static struct net_device *my_dev;
 391
 392 static int __init com90io_init(void)
 393 {
 394         struct net_device *dev;
 395         int err;
 396
 397         dev = alloc_arcdev(device);
 398         if (!dev)
 399                 return -ENOMEM;
 400
 401         SET_MODULE_OWNER(dev);
 402
 403         dev->base_addr = io;
 404         dev->irq = irq;
 405         if (dev->irq == 2)
 406                 dev->irq = 9;
 407
 408         err = com90io_probe(dev);
 409
 410         if (err) {
 411                 free_netdev(dev);
 412                 return err;
 413         }
 414
 415         my_dev = dev;
 416         return 0;
 417 }
 418
 419 static void __exit com90io_exit(void)
 420 {
 421         struct net_device *dev = my_dev;
 422         int ioaddr = dev->base_addr;
 423
 424         unregister_netdev(dev);
 425
 426         /* Set the thing back to MMAP mode, in case the old driver is loaded later */
 427         outb((inb(_CONFIG) & ~IOMAPflag), _CONFIG);
 428
 429         free_irq(dev->irq, dev);
 430         release_region(dev->base_addr, ARCNET_TOTAL_SIZE);
 431         free_netdev(dev);
 432 }
 433
 434 module_init(com90io_init)
 435 module_exit(com90io_exit)