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
  29 #define pr_fmt(fmt) "arcnet:" KBUILD_MODNAME ": " fmt
  30
  31 #include <linux/kernel.h>
  32 #include <linux/module.h>
  33 #include <linux/moduleparam.h>
  34 #include <linux/ioport.h>
  35 #include <linux/delay.h>
  36 #include <linux/netdevice.h>
  37 #include <linux/bootmem.h>
  38 #include <linux/init.h>
  39 #include <linux/interrupt.h>
  40 #include <linux/io.h>
  41
  42 #include "arcdevice.h"
  43 #include "com9026.h"
  44
  45 /* Internal function declarations */
  46
  47 static int com90io_found(struct net_device *dev);
  48 static void com90io_command(struct net_device *dev, int command);
  49 static int com90io_status(struct net_device *dev);
  50 static void com90io_setmask(struct net_device *dev, int mask);
  51 static int com90io_reset(struct net_device *dev, int really_reset);
  52 static void com90io_copy_to_card(struct net_device *dev, int bufnum, int offset,
  53                                  void *buf, int count);
  54 static void com90io_copy_from_card(struct net_device *dev, int bufnum,
  55                                    int offset, void *buf, int count);
  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 /****************************************************************************
  63  *                                                                          *
  64  * IO-mapped operation routines                                             *
  65  *                                                                          *
  66  ****************************************************************************/
  67
  68 #undef ONE_AT_A_TIME_TX
  69 #undef ONE_AT_A_TIME_RX
  70
  71 static u_char get_buffer_byte(struct net_device *dev, unsigned offset)
  72 {
  73         int ioaddr = dev->base_addr;
  74
  75         arcnet_outb(offset >> 8, ioaddr, COM9026_REG_W_ADDR_HI);
  76         arcnet_outb(offset & 0xff, ioaddr, COM9026_REG_W_ADDR_LO);
  77
  78         return arcnet_inb(ioaddr, COM9026_REG_RW_MEMDATA);
  79 }
  80
  81 #ifdef ONE_AT_A_TIME_TX
  82 static void put_buffer_byte(struct net_device *dev, unsigned offset,
  83                             u_char datum)
  84 {
  85         int ioaddr = dev->base_addr;
  86
  87         arcnet_outb(offset >> 8, ioaddr, COM9026_REG_W_ADDR_HI);
  88         arcnet_outb(offset & 0xff, ioaddr, COM9026_REG_W_ADDR_LO);
  89
  90         arcnet_outb(datum, ioaddr, COM9026_REG_RW_MEMDATA);
  91 }
  92
  93 #endif
  94
  95 static void get_whole_buffer(struct net_device *dev, unsigned offset,
  96                              unsigned length, char *dest)
  97 {
  98         int ioaddr = dev->base_addr;
  99
 100         arcnet_outb((offset >> 8) | AUTOINCflag, ioaddr, COM9026_REG_W_ADDR_HI);
 101         arcnet_outb(offset & 0xff, ioaddr, COM9026_REG_W_ADDR_LO);
 102
 103         while (length--)
 104 #ifdef ONE_AT_A_TIME_RX
 105                 *(dest++) = get_buffer_byte(dev, offset++);
 106 #else
 107                 *(dest++) = arcnet_inb(ioaddr, COM9026_REG_RW_MEMDATA);
 108 #endif
 109 }
 110
 111 static void put_whole_buffer(struct net_device *dev, unsigned offset,
 112                              unsigned length, char *dest)
 113 {
 114         int ioaddr = dev->base_addr;
 115
 116         arcnet_outb((offset >> 8) | AUTOINCflag, ioaddr, COM9026_REG_W_ADDR_HI);
 117         arcnet_outb(offset & 0xff, ioaddr,COM9026_REG_W_ADDR_LO);
 118
 119         while (length--)
 120 #ifdef ONE_AT_A_TIME_TX
 121                 put_buffer_byte(dev, offset++, *(dest++));
 122 #else
 123                 arcnet_outb(*(dest++), ioaddr, COM9026_REG_RW_MEMDATA);
 124 #endif
 125 }
 126
 127 /* We cannot probe for an IO mapped card either, although we can check that
 128  * it's where we were told it was, and even autoirq
 129  */
 130 static int __init com90io_probe(struct net_device *dev)
 131 {
 132         int ioaddr = dev->base_addr, status;
 133         unsigned long airqmask;
 134
 135         if (BUGLVL(D_NORMAL)) {
 136                 pr_info("%s\n", "COM90xx IO-mapped mode support (by David Woodhouse et el.)");
 137                 pr_info("E-mail me if you actually test this driver, please!\n");
 138         }
 139
 140         if (!ioaddr) {
 141                 arc_printk(D_NORMAL, dev, "No autoprobe for IO mapped cards; you must specify the base address!\n");
 142                 return -ENODEV;
 143         }
 144         if (!request_region(ioaddr, ARCNET_TOTAL_SIZE, "com90io probe")) {
 145                 arc_printk(D_INIT_REASONS, dev, "IO request_region %x-%x failed\n",
 146                            ioaddr, ioaddr + ARCNET_TOTAL_SIZE - 1);
 147                 return -ENXIO;
 148         }
 149         if (arcnet_inb(ioaddr, COM9026_REG_R_STATUS) == 0xFF) {
 150                 arc_printk(D_INIT_REASONS, dev, "IO address %x empty\n",
 151                            ioaddr);
 152                 goto err_out;
 153         }
 154         arcnet_inb(ioaddr, COM9026_REG_R_RESET);
 155         mdelay(RESETtime);
 156
 157         status = arcnet_inb(ioaddr, COM9026_REG_R_STATUS);
 158
 159         if ((status & 0x9D) != (NORXflag | RECONflag | TXFREEflag | RESETflag)) {
 160                 arc_printk(D_INIT_REASONS, dev, "Status invalid (%Xh)\n",
 161                            status);
 162                 goto err_out;
 163         }
 164         arc_printk(D_INIT_REASONS, dev, "Status after reset: %X\n", status);
 165
 166         arcnet_outb(CFLAGScmd | RESETclear | CONFIGclear,
 167                     ioaddr, COM9026_REG_W_COMMAND);
 168
 169         arc_printk(D_INIT_REASONS, dev, "Status after reset acknowledged: %X\n",
 170                    status);
 171
 172         status = arcnet_inb(ioaddr, COM9026_REG_R_STATUS);
 173
 174         if (status & RESETflag) {
 175                 arc_printk(D_INIT_REASONS, dev, "Eternal reset (status=%Xh)\n",
 176                            status);
 177                 goto err_out;
 178         }
 179         arcnet_outb((0x16 | IOMAPflag) & ~ENABLE16flag,
 180                     ioaddr, COM9026_REG_RW_CONFIG);
 181
 182         /* Read first loc'n of memory */
 183
 184         arcnet_outb(AUTOINCflag, ioaddr, COM9026_REG_W_ADDR_HI);
 185         arcnet_outb(0, ioaddr,  COM9026_REG_W_ADDR_LO);
 186
 187         status = arcnet_inb(ioaddr, COM9026_REG_RW_MEMDATA);
 188         if (status != 0xd1) {
 189                 arc_printk(D_INIT_REASONS, dev, "Signature byte not found (%Xh instead).\n",
 190                            status);
 191                 goto err_out;
 192         }
 193         if (!dev->irq) {
 194                 /* if we do this, we're sure to get an IRQ since the
 195                  * card has just reset and the NORXflag is on until
 196                  * we tell it to start receiving.
 197                  */
 198
 199                 airqmask = probe_irq_on();
 200                 arcnet_outb(NORXflag, ioaddr, COM9026_REG_W_INTMASK);
 201                 udelay(1);
 202                 arcnet_outb(0, ioaddr, COM9026_REG_W_INTMASK);
 203                 dev->irq = probe_irq_off(airqmask);
 204
 205                 if ((int)dev->irq <= 0) {
 206                         arc_printk(D_INIT_REASONS, dev, "Autoprobe IRQ failed\n");
 207                         goto err_out;
 208                 }
 209         }
 210         release_region(ioaddr, ARCNET_TOTAL_SIZE); /* end of probing */
 211         return com90io_found(dev);
 212
 213 err_out:
 214         release_region(ioaddr, ARCNET_TOTAL_SIZE);
 215         return -ENODEV;
 216 }
 217
 218 /* Set up the struct net_device associated with this card.  Called after
 219  * probing succeeds.
 220  */
 221 static int __init com90io_found(struct net_device *dev)
 222 {
 223         struct arcnet_local *lp;
 224         int ioaddr = dev->base_addr;
 225         int err;
 226
 227         /* Reserve the irq */
 228         if (request_irq(dev->irq, arcnet_interrupt, 0,
 229                         "arcnet (COM90xx-IO)", dev)) {
 230                 arc_printk(D_NORMAL, dev, "Can't get IRQ %d!\n", dev->irq);
 231                 return -ENODEV;
 232         }
 233         /* Reserve the I/O region */
 234         if (!request_region(dev->base_addr, ARCNET_TOTAL_SIZE,
 235                             "arcnet (COM90xx-IO)")) {
 236                 free_irq(dev->irq, dev);
 237                 return -EBUSY;
 238         }
 239
 240         lp = netdev_priv(dev);
 241         lp->card_name = "COM90xx I/O";
 242         lp->hw.command = com90io_command;
 243         lp->hw.status = com90io_status;
 244         lp->hw.intmask = com90io_setmask;
 245         lp->hw.reset = com90io_reset;
 246         lp->hw.owner = THIS_MODULE;
 247         lp->hw.copy_to_card = com90io_copy_to_card;
 248         lp->hw.copy_from_card = com90io_copy_from_card;
 249
 250         lp->config = (0x16 | IOMAPflag) & ~ENABLE16flag;
 251         arcnet_outb(lp->config, ioaddr, COM9026_REG_RW_CONFIG);
 252
 253         /* get and check the station ID from offset 1 in shmem */
 254
 255         dev->dev_addr[0] = get_buffer_byte(dev, 1);
 256
 257         err = register_netdev(dev);
 258         if (err) {
 259                 arcnet_outb(arcnet_inb(ioaddr, COM9026_REG_RW_CONFIG) & ~IOMAPflag,
 260                             ioaddr, COM9026_REG_RW_CONFIG);
 261                 free_irq(dev->irq, dev);
 262                 release_region(dev->base_addr, ARCNET_TOTAL_SIZE);
 263                 return err;
 264         }
 265
 266         arc_printk(D_NORMAL, dev, "COM90IO: station %02Xh found at %03lXh, IRQ %d.\n",
 267                    dev->dev_addr[0], dev->base_addr, dev->irq);
 268
 269         return 0;
 270 }
 271
 272 /* Do a hardware reset on the card, and set up necessary registers.
 273  *
 274  * This should be called as little as possible, because it disrupts the
 275  * token on the network (causes a RECON) and requires a significant delay.
 276  *
 277  * However, it does make sure the card is in a defined state.
 278  */
 279 static int com90io_reset(struct net_device *dev, int really_reset)
 280 {
 281         struct arcnet_local *lp = netdev_priv(dev);
 282         short ioaddr = dev->base_addr;
 283
 284         arc_printk(D_INIT, dev, "Resetting %s (status=%02Xh)\n",
 285                    dev->name, arcnet_inb(ioaddr, COM9026_REG_R_STATUS));
 286
 287         if (really_reset) {
 288                 /* reset the card */
 289                 arcnet_inb(ioaddr, COM9026_REG_R_RESET);
 290                 mdelay(RESETtime);
 291         }
 292         /* Set the thing to IO-mapped, 8-bit  mode */
 293         lp->config = (0x1C | IOMAPflag) & ~ENABLE16flag;
 294         arcnet_outb(lp->config, ioaddr, COM9026_REG_RW_CONFIG);
 295
 296         arcnet_outb(CFLAGScmd | RESETclear, ioaddr, COM9026_REG_W_COMMAND);
 297                                         /* clear flags & end reset */
 298         arcnet_outb(CFLAGScmd | CONFIGclear, ioaddr, COM9026_REG_W_COMMAND);
 299
 300         /* verify that the ARCnet signature byte is present */
 301         if (get_buffer_byte(dev, 0) != TESTvalue) {
 302                 arc_printk(D_NORMAL, dev, "reset failed: TESTvalue not present.\n");
 303                 return 1;
 304         }
 305         /* enable extended (512-byte) packets */
 306         arcnet_outb(CONFIGcmd | EXTconf, ioaddr, COM9026_REG_W_COMMAND);
 307         /* done!  return success. */
 308         return 0;
 309 }
 310
 311 static void com90io_command(struct net_device *dev, int cmd)
 312 {
 313         short ioaddr = dev->base_addr;
 314
 315         arcnet_outb(cmd, ioaddr, COM9026_REG_W_COMMAND);
 316 }
 317
 318 static int com90io_status(struct net_device *dev)
 319 {
 320         short ioaddr = dev->base_addr;
 321
 322         return arcnet_inb(ioaddr, COM9026_REG_R_STATUS);
 323 }
 324
 325 static void com90io_setmask(struct net_device *dev, int mask)
 326 {
 327         short ioaddr = dev->base_addr;
 328
 329         arcnet_outb(mask, ioaddr, COM9026_REG_W_INTMASK);
 330 }
 331
 332 static void com90io_copy_to_card(struct net_device *dev, int bufnum,
 333                                  int offset, void *buf, int count)
 334 {
 335         TIME(dev, "put_whole_buffer", count,
 336              put_whole_buffer(dev, bufnum * 512 + offset, count, buf));
 337 }
 338
 339 static void com90io_copy_from_card(struct net_device *dev, int bufnum,
 340                                    int offset, void *buf, int count)
 341 {
 342         TIME(dev, "get_whole_buffer", count,
 343              get_whole_buffer(dev, bufnum * 512 + offset, count, buf));
 344 }
 345
 346 static int io;                  /* use the insmod io= irq= shmem= options */
 347 static int irq;
 348 static char device[9];          /* use eg. device=arc1 to change name */
 349
 350 module_param(io, int, 0);
 351 module_param(irq, int, 0);
 352 module_param_string(device, device, sizeof(device), 0);
 353 MODULE_LICENSE("GPL");
 354
 355 #ifndef MODULE
 356 static int __init com90io_setup(char *s)
 357 {
 358         int ints[4];
 359
 360         s = get_options(s, 4, ints);
 361         if (!ints[0])
 362                 return 0;
 363         switch (ints[0]) {
 364         default:                /* ERROR */
 365                 pr_err("Too many arguments\n");
 366         case 2:         /* IRQ */
 367                 irq = ints[2];
 368         case 1:         /* IO address */
 369                 io = ints[1];
 370         }
 371         if (*s)
 372                 snprintf(device, sizeof(device), "%s", s);
 373         return 1;
 374 }
 375 __setup("com90io=", com90io_setup);
 376 #endif
 377
 378 static struct net_device *my_dev;
 379
 380 static int __init com90io_init(void)
 381 {
 382         struct net_device *dev;
 383         int err;
 384
 385         dev = alloc_arcdev(device);
 386         if (!dev)
 387                 return -ENOMEM;
 388
 389         dev->base_addr = io;
 390         dev->irq = irq;
 391         if (dev->irq == 2)
 392                 dev->irq = 9;
 393
 394         err = com90io_probe(dev);
 395
 396         if (err) {
 397                 free_netdev(dev);
 398                 return err;
 399         }
 400
 401         my_dev = dev;
 402         return 0;
 403 }
 404
 405 static void __exit com90io_exit(void)
 406 {
 407         struct net_device *dev = my_dev;
 408         int ioaddr = dev->base_addr;
 409
 410         unregister_netdev(dev);
 411
 412         /* In case the old driver is loaded later,
 413          * set the thing back to MMAP mode
 414          */
 415         arcnet_outb(arcnet_inb(ioaddr, COM9026_REG_RW_CONFIG) & ~IOMAPflag,
 416                     ioaddr, COM9026_REG_RW_CONFIG);
 417
 418         free_irq(dev->irq, dev);
 419         release_region(dev->base_addr, ARCNET_TOTAL_SIZE);
 420         free_netdev(dev);
 421 }
 422
 423 module_init(com90io_init)
 424 module_exit(com90io_exit)