drivers/net/apne.c

   1 /*
   2  * Amiga Linux/68k 8390 based PCMCIA Ethernet Driver for the Amiga 1200
   3  *
   4  * (C) Copyright 1997 Alain Malek
   5  *                    (Alain.Malek@cryogen.com)
   6  *
   7  * ----------------------------------------------------------------------------
   8  *
   9  * This program is based on
  10  *
  11  * ne.c:       A general non-shared-memory NS8390 ethernet driver for linux
  12  *             Written 1992-94 by Donald Becker.
  13  *
  14  * 8390.c:     A general NS8390 ethernet driver core for linux.
  15  *             Written 1992-94 by Donald Becker.
  16  *
  17  * cnetdevice: A Sana-II ethernet driver for AmigaOS
  18  *             Written by Bruce Abbott (bhabbott@inhb.co.nz)
  19  *
  20  * ----------------------------------------------------------------------------
  21  *
  22  * This file is subject to the terms and conditions of the GNU General Public
  23  * License.  See the file COPYING in the main directory of the Linux
  24  * distribution for more details.
  25  *
  26  * ----------------------------------------------------------------------------
  27  *
  28  */
  29
  30
  31 #include <linux/module.h>
  32 #include <linux/kernel.h>
  33 #include <linux/errno.h>
  34 #include <linux/pci.h>
  35 #include <linux/init.h>
  36 #include <linux/delay.h>
  37 #include <linux/netdevice.h>
  38 #include <linux/etherdevice.h>
  39 #include <linux/jiffies.h>
  40
  41 #include <asm/system.h>
  42 #include <asm/io.h>
  43 #include <asm/setup.h>
  44 #include <asm/amigaints.h>
  45 #include <asm/amigahw.h>
  46 #include <asm/amigayle.h>
  47 #include <asm/amipcmcia.h>
  48
  49 #include "8390.h"
  50
  51 /* ---- No user-serviceable parts below ---- */
  52
  53 #define DRV_NAME "apne"
  54
  55 #define NE_BASE  (dev->base_addr)
  56 #define NE_CMD                  0x00
  57 #define NE_DATAPORT             0x10            /* NatSemi-defined port window offset. */
  58 #define NE_RESET                0x1f            /* Issue a read to reset, a write to clear. */
  59 #define NE_IO_EXTENT            0x20
  60
  61 #define NE_EN0_ISR              0x07
  62 #define NE_EN0_DCFG             0x0e
  63
  64 #define NE_EN0_RSARLO           0x08
  65 #define NE_EN0_RSARHI           0x09
  66 #define NE_EN0_RCNTLO           0x0a
  67 #define NE_EN0_RXCR             0x0c
  68 #define NE_EN0_TXCR             0x0d
  69 #define NE_EN0_RCNTHI           0x0b
  70 #define NE_EN0_IMR              0x0f
  71
  72 #define NE1SM_START_PG  0x20    /* First page of TX buffer */
  73 #define NE1SM_STOP_PG   0x40    /* Last page +1 of RX ring */
  74 #define NESM_START_PG   0x40    /* First page of TX buffer */
  75 #define NESM_STOP_PG    0x80    /* Last page +1 of RX ring */
  76
  77
  78 struct net_device * __init apne_probe(int unit);
  79 static int apne_probe1(struct net_device *dev, int ioaddr);
  80
  81 static int apne_open(struct net_device *dev);
  82 static int apne_close(struct net_device *dev);
  83
  84 static void apne_reset_8390(struct net_device *dev);
  85 static void apne_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
  86                           int ring_page);
  87 static void apne_block_input(struct net_device *dev, int count,
  88                                                                 struct sk_buff *skb, int ring_offset);
  89 static void apne_block_output(struct net_device *dev, const int count,
  90                                                         const unsigned char *buf, const int start_page);
  91 static irqreturn_t apne_interrupt(int irq, void *dev_id);
  92
  93 static int init_pcmcia(void);
  94
  95 /* IO base address used for nic */
  96
  97 #define IOBASE 0x300
  98
  99 /*
 100    use MANUAL_CONFIG and MANUAL_OFFSET for enabling IO by hand
 101    you can find the values to use by looking at the cnet.device
 102    config file example (the default values are for the CNET40BC card)
 103 */
 104
 105 /*
 106 #define MANUAL_CONFIG 0x20
 107 #define MANUAL_OFFSET 0x3f8
 108
 109 #define MANUAL_HWADDR0 0x00
 110 #define MANUAL_HWADDR1 0x12
 111 #define MANUAL_HWADDR2 0x34
 112 #define MANUAL_HWADDR3 0x56
 113 #define MANUAL_HWADDR4 0x78
 114 #define MANUAL_HWADDR5 0x9a
 115 */
 116
 117 static const char version[] =
 118     "apne.c:v1.1 7/10/98 Alain Malek (Alain.Malek@cryogen.ch)\n";
 119
 120 static int apne_owned;  /* signal if card already owned */
 121
 122 struct net_device * __init apne_probe(int unit)
 123 {
 124         struct net_device *dev;
 125 #ifndef MANUAL_CONFIG
 126         char tuple[8];
 127 #endif
 128         int err;
 129
 130         if (!MACH_IS_AMIGA)
 131                 return ERR_PTR(-ENODEV);
 132
 133         if (apne_owned)
 134                 return ERR_PTR(-ENODEV);
 135
 136         if ( !(AMIGAHW_PRESENT(PCMCIA)) )
 137                 return ERR_PTR(-ENODEV);
 138
 139         printk("Looking for PCMCIA ethernet card : ");
 140
 141         /* check if a card is inserted */
 142         if (!(PCMCIA_INSERTED)) {
 143                 printk("NO PCMCIA card inserted\n");
 144                 return ERR_PTR(-ENODEV);
 145         }
 146
 147         dev = alloc_ei_netdev();
 148         if (!dev)
 149                 return ERR_PTR(-ENOMEM);
 150         if (unit >= 0) {
 151                 sprintf(dev->name, "eth%d", unit);
 152                 netdev_boot_setup_check(dev);
 153         }
 154
 155         /* disable pcmcia irq for readtuple */
 156         pcmcia_disable_irq();
 157
 158 #ifndef MANUAL_CONFIG
 159         if ((pcmcia_copy_tuple(CISTPL_FUNCID, tuple, 8) < 3) ||
 160                 (tuple[2] != CISTPL_FUNCID_NETWORK)) {
 161                 printk("not an ethernet card\n");
 162                 /* XXX: shouldn't we re-enable irq here? */
 163                 free_netdev(dev);
 164                 return ERR_PTR(-ENODEV);
 165         }
 166 #endif
 167
 168         printk("ethernet PCMCIA card inserted\n");
 169
 170         if (!init_pcmcia()) {
 171                 /* XXX: shouldn't we re-enable irq here? */
 172                 free_netdev(dev);
 173                 return ERR_PTR(-ENODEV);
 174         }
 175
 176         if (!request_region(IOBASE, 0x20, DRV_NAME)) {
 177                 free_netdev(dev);
 178                 return ERR_PTR(-EBUSY);
 179         }
 180
 181         err = apne_probe1(dev, IOBASE);
 182         if (err) {
 183                 release_region(IOBASE, 0x20);
 184                 free_netdev(dev);
 185                 return ERR_PTR(err);
 186         }
 187         err = register_netdev(dev);
 188         if (!err)
 189                 return dev;
 190
 191         pcmcia_disable_irq();
 192         free_irq(IRQ_AMIGA_PORTS, dev);
 193         pcmcia_reset();
 194         release_region(IOBASE, 0x20);
 195         free_netdev(dev);
 196         return ERR_PTR(err);
 197 }
 198
 199 static int __init apne_probe1(struct net_device *dev, int ioaddr)
 200 {
 201     int i;
 202     unsigned char SA_prom[32];
 203     int wordlength = 2;
 204     const char *name = NULL;
 205     int start_page, stop_page;
 206 #ifndef MANUAL_HWADDR0
 207     int neX000, ctron;
 208 #endif
 209     static unsigned version_printed;
 210
 211     if (ei_debug  &&  version_printed++ == 0)
 212         printk(version);
 213
 214     printk("PCMCIA NE*000 ethercard probe");
 215
 216     /* Reset card. Who knows what dain-bramaged state it was left in. */
 217     {   unsigned long reset_start_time = jiffies;
 218
 219         outb(inb(ioaddr + NE_RESET), ioaddr + NE_RESET);
 220
 221         while ((inb(ioaddr + NE_EN0_ISR) & ENISR_RESET) == 0)
 222                 if (time_after(jiffies, reset_start_time + 2*HZ/100)) {
 223                         printk(" not found (no reset ack).\n");
 224                         return -ENODEV;
 225                 }
 226
 227         outb(0xff, ioaddr + NE_EN0_ISR);                /* Ack all intr. */
 228     }
 229
 230 #ifndef MANUAL_HWADDR0
 231
 232     /* Read the 16 bytes of station address PROM.
 233        We must first initialize registers, similar to NS8390_init(eifdev, 0).
 234        We can't reliably read the SAPROM address without this.
 235        (I learned the hard way!). */
 236     {
 237         struct {unsigned long value, offset; } program_seq[] = {
 238             {E8390_NODMA+E8390_PAGE0+E8390_STOP, NE_CMD}, /* Select page 0*/
 239             {0x48,      NE_EN0_DCFG},   /* Set byte-wide (0x48) access. */
 240             {0x00,      NE_EN0_RCNTLO}, /* Clear the count regs. */
 241             {0x00,      NE_EN0_RCNTHI},
 242             {0x00,      NE_EN0_IMR},    /* Mask completion irq. */
 243             {0xFF,      NE_EN0_ISR},
 244             {E8390_RXOFF, NE_EN0_RXCR}, /* 0x20  Set to monitor */
 245             {E8390_TXOFF, NE_EN0_TXCR}, /* 0x02  and loopback mode. */
 246             {32,        NE_EN0_RCNTLO},
 247             {0x00,      NE_EN0_RCNTHI},
 248             {0x00,      NE_EN0_RSARLO}, /* DMA starting at 0x0000. */
 249             {0x00,      NE_EN0_RSARHI},
 250             {E8390_RREAD+E8390_START, NE_CMD},
 251         };
 252         for (i = 0; i < ARRAY_SIZE(program_seq); i++) {
 253             outb(program_seq[i].value, ioaddr + program_seq[i].offset);
 254         }
 255
 256     }
 257     for(i = 0; i < 32 /*sizeof(SA_prom)*/; i+=2) {
 258         SA_prom[i] = inb(ioaddr + NE_DATAPORT);
 259         SA_prom[i+1] = inb(ioaddr + NE_DATAPORT);
 260         if (SA_prom[i] != SA_prom[i+1])
 261             wordlength = 1;
 262     }
 263
 264     /*  At this point, wordlength *only* tells us if the SA_prom is doubled
 265         up or not because some broken PCI cards don't respect the byte-wide
 266         request in program_seq above, and hence don't have doubled up values.
 267         These broken cards would otherwise be detected as an ne1000.  */
 268
 269     if (wordlength == 2)
 270         for (i = 0; i < 16; i++)
 271                 SA_prom[i] = SA_prom[i+i];
 272
 273     if (wordlength == 2) {
 274         /* We must set the 8390 for word mode. */
 275         outb(0x49, ioaddr + NE_EN0_DCFG);
 276         start_page = NESM_START_PG;
 277         stop_page = NESM_STOP_PG;
 278     } else {
 279         start_page = NE1SM_START_PG;
 280         stop_page = NE1SM_STOP_PG;
 281     }
 282
 283     neX000 = (SA_prom[14] == 0x57  &&  SA_prom[15] == 0x57);
 284     ctron =  (SA_prom[0] == 0x00 && SA_prom[1] == 0x00 && SA_prom[2] == 0x1d);
 285
 286     /* Set up the rest of the parameters. */
 287     if (neX000) {
 288         name = (wordlength == 2) ? "NE2000" : "NE1000";
 289     } else if (ctron) {
 290         name = (wordlength == 2) ? "Ctron-8" : "Ctron-16";
 291         start_page = 0x01;
 292         stop_page = (wordlength == 2) ? 0x40 : 0x20;
 293     } else {
 294         printk(" not found.\n");
 295         return -ENXIO;
 296
 297     }
 298
 299 #else
 300     wordlength = 2;
 301     /* We must set the 8390 for word mode. */
 302     outb(0x49, ioaddr + NE_EN0_DCFG);
 303     start_page = NESM_START_PG;
 304     stop_page = NESM_STOP_PG;
 305
 306     SA_prom[0] = MANUAL_HWADDR0;
 307     SA_prom[1] = MANUAL_HWADDR1;
 308     SA_prom[2] = MANUAL_HWADDR2;
 309     SA_prom[3] = MANUAL_HWADDR3;
 310     SA_prom[4] = MANUAL_HWADDR4;
 311     SA_prom[5] = MANUAL_HWADDR5;
 312     name = "NE2000";
 313 #endif
 314
 315     dev->base_addr = ioaddr;
 316     dev->irq = IRQ_AMIGA_PORTS;
 317
 318     /* Install the Interrupt handler */
 319     i = request_irq(dev->irq, apne_interrupt, IRQF_SHARED, DRV_NAME, dev);
 320     if (i) return i;
 321
 322     for(i = 0; i < ETHER_ADDR_LEN; i++)
 323         dev->dev_addr[i] = SA_prom[i];
 324
 325     printk(" %pM\n", dev->dev_addr);
 326
 327     printk("%s: %s found.\n", dev->name, name);
 328
 329     ei_status.name = name;
 330     ei_status.tx_start_page = start_page;
 331     ei_status.stop_page = stop_page;
 332     ei_status.word16 = (wordlength == 2);
 333
 334     ei_status.rx_start_page = start_page + TX_PAGES;
 335
 336     ei_status.reset_8390 = &apne_reset_8390;
 337     ei_status.block_input = &apne_block_input;
 338     ei_status.block_output = &apne_block_output;
 339     ei_status.get_8390_hdr = &apne_get_8390_hdr;
 340     dev->open = &apne_open;
 341     dev->stop = &apne_close;
 342 #ifdef CONFIG_NET_POLL_CONTROLLER
 343     dev->poll_controller = ei_poll;
 344 #endif
 345     NS8390_init(dev, 0);
 346
 347     pcmcia_ack_int(pcmcia_get_intreq());                /* ack PCMCIA int req */
 348     pcmcia_enable_irq();
 349
 350     apne_owned = 1;
 351
 352     return 0;
 353 }
 354
 355 static int
 356 apne_open(struct net_device *dev)
 357 {
 358     ei_open(dev);
 359     return 0;
 360 }
 361
 362 static int
 363 apne_close(struct net_device *dev)
 364 {
 365     if (ei_debug > 1)
 366         printk("%s: Shutting down ethercard.\n", dev->name);
 367     ei_close(dev);
 368     return 0;
 369 }
 370
 371 /* Hard reset the card.  This used to pause for the same period that a
 372    8390 reset command required, but that shouldn't be necessary. */
 373 static void
 374 apne_reset_8390(struct net_device *dev)
 375 {
 376     unsigned long reset_start_time = jiffies;
 377
 378     init_pcmcia();
 379
 380     if (ei_debug > 1) printk("resetting the 8390 t=%ld...", jiffies);
 381
 382     outb(inb(NE_BASE + NE_RESET), NE_BASE + NE_RESET);
 383
 384     ei_status.txing = 0;
 385     ei_status.dmaing = 0;
 386
 387     /* This check _should_not_ be necessary, omit eventually. */
 388     while ((inb(NE_BASE+NE_EN0_ISR) & ENISR_RESET) == 0)
 389         if (time_after(jiffies, reset_start_time + 2*HZ/100)) {
 390             printk("%s: ne_reset_8390() did not complete.\n", dev->name);
 391             break;
 392         }
 393     outb(ENISR_RESET, NE_BASE + NE_EN0_ISR);    /* Ack intr. */
 394 }
 395
 396 /* Grab the 8390 specific header. Similar to the block_input routine, but
 397    we don't need to be concerned with ring wrap as the header will be at
 398    the start of a page, so we optimize accordingly. */
 399
 400 static void
 401 apne_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
 402 {
 403
 404     int nic_base = dev->base_addr;
 405     int cnt;
 406     char *ptrc;
 407     short *ptrs;
 408
 409     /* This *shouldn't* happen. If it does, it's the last thing you'll see */
 410     if (ei_status.dmaing) {
 411         printk("%s: DMAing conflict in ne_get_8390_hdr "
 412            "[DMAstat:%d][irqlock:%d][intr:%d].\n",
 413            dev->name, ei_status.dmaing, ei_status.irqlock, dev->irq);
 414         return;
 415     }
 416
 417     ei_status.dmaing |= 0x01;
 418     outb(E8390_NODMA+E8390_PAGE0+E8390_START, nic_base+ NE_CMD);
 419     outb(ENISR_RDC, nic_base + NE_EN0_ISR);
 420     outb(sizeof(struct e8390_pkt_hdr), nic_base + NE_EN0_RCNTLO);
 421     outb(0, nic_base + NE_EN0_RCNTHI);
 422     outb(0, nic_base + NE_EN0_RSARLO);          /* On page boundary */
 423     outb(ring_page, nic_base + NE_EN0_RSARHI);
 424     outb(E8390_RREAD+E8390_START, nic_base + NE_CMD);
 425
 426     if (ei_status.word16) {
 427         ptrs = (short*)hdr;
 428         for(cnt = 0; cnt < (sizeof(struct e8390_pkt_hdr)>>1); cnt++)
 429             *ptrs++ = inw(NE_BASE + NE_DATAPORT);
 430     } else {
 431         ptrc = (char*)hdr;
 432         for(cnt = 0; cnt < sizeof(struct e8390_pkt_hdr); cnt++)
 433             *ptrc++ = inb(NE_BASE + NE_DATAPORT);
 434     }
 435
 436     outb(ENISR_RDC, nic_base + NE_EN0_ISR);     /* Ack intr. */
 437     ei_status.dmaing &= ~0x01;
 438
 439     le16_to_cpus(&hdr->count);
 440 }
 441
 442 /* Block input and output, similar to the Crynwr packet driver.  If you
 443    are porting to a new ethercard, look at the packet driver source for hints.
 444    The NEx000 doesn't share the on-board packet memory -- you have to put
 445    the packet out through the "remote DMA" dataport using outb. */
 446
 447 static void
 448 apne_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
 449 {
 450     int nic_base = dev->base_addr;
 451     char *buf = skb->data;
 452     char *ptrc;
 453     short *ptrs;
 454     int cnt;
 455
 456     /* This *shouldn't* happen. If it does, it's the last thing you'll see */
 457     if (ei_status.dmaing) {
 458         printk("%s: DMAing conflict in ne_block_input "
 459            "[DMAstat:%d][irqlock:%d][intr:%d].\n",
 460            dev->name, ei_status.dmaing, ei_status.irqlock, dev->irq);
 461         return;
 462     }
 463     ei_status.dmaing |= 0x01;
 464     outb(E8390_NODMA+E8390_PAGE0+E8390_START, nic_base+ NE_CMD);
 465     outb(ENISR_RDC, nic_base + NE_EN0_ISR);
 466     outb(count & 0xff, nic_base + NE_EN0_RCNTLO);
 467     outb(count >> 8, nic_base + NE_EN0_RCNTHI);
 468     outb(ring_offset & 0xff, nic_base + NE_EN0_RSARLO);
 469     outb(ring_offset >> 8, nic_base + NE_EN0_RSARHI);
 470     outb(E8390_RREAD+E8390_START, nic_base + NE_CMD);
 471     if (ei_status.word16) {
 472       ptrs = (short*)buf;
 473       for (cnt = 0; cnt < (count>>1); cnt++)
 474         *ptrs++ = inw(NE_BASE + NE_DATAPORT);
 475       if (count & 0x01) {
 476         buf[count-1] = inb(NE_BASE + NE_DATAPORT);
 477       }
 478     } else {
 479       ptrc = (char*)buf;
 480       for (cnt = 0; cnt < count; cnt++)
 481         *ptrc++ = inb(NE_BASE + NE_DATAPORT);
 482     }
 483
 484     outb(ENISR_RDC, nic_base + NE_EN0_ISR);     /* Ack intr. */
 485     ei_status.dmaing &= ~0x01;
 486 }
 487
 488 static void
 489 apne_block_output(struct net_device *dev, int count,
 490                 const unsigned char *buf, const int start_page)
 491 {
 492     int nic_base = NE_BASE;
 493     unsigned long dma_start;
 494     char *ptrc;
 495     short *ptrs;
 496     int cnt;
 497
 498     /* Round the count up for word writes.  Do we need to do this?
 499        What effect will an odd byte count have on the 8390?
 500        I should check someday. */
 501     if (ei_status.word16 && (count & 0x01))
 502       count++;
 503
 504     /* This *shouldn't* happen. If it does, it's the last thing you'll see */
 505     if (ei_status.dmaing) {
 506         printk("%s: DMAing conflict in ne_block_output."
 507            "[DMAstat:%d][irqlock:%d][intr:%d]\n",
 508            dev->name, ei_status.dmaing, ei_status.irqlock, dev->irq);
 509         return;
 510     }
 511     ei_status.dmaing |= 0x01;
 512     /* We should already be in page 0, but to be safe... */
 513     outb(E8390_PAGE0+E8390_START+E8390_NODMA, nic_base + NE_CMD);
 514
 515     outb(ENISR_RDC, nic_base + NE_EN0_ISR);
 516
 517    /* Now the normal output. */
 518     outb(count & 0xff, nic_base + NE_EN0_RCNTLO);
 519     outb(count >> 8,   nic_base + NE_EN0_RCNTHI);
 520     outb(0x00, nic_base + NE_EN0_RSARLO);
 521     outb(start_page, nic_base + NE_EN0_RSARHI);
 522
 523     outb(E8390_RWRITE+E8390_START, nic_base + NE_CMD);
 524     if (ei_status.word16) {
 525         ptrs = (short*)buf;
 526         for (cnt = 0; cnt < count>>1; cnt++)
 527             outw(*ptrs++, NE_BASE+NE_DATAPORT);
 528     } else {
 529         ptrc = (char*)buf;
 530         for (cnt = 0; cnt < count; cnt++)
 531             outb(*ptrc++, NE_BASE + NE_DATAPORT);
 532     }
 533
 534     dma_start = jiffies;
 535
 536     while ((inb(NE_BASE + NE_EN0_ISR) & ENISR_RDC) == 0)
 537         if (time_after(jiffies, dma_start + 2*HZ/100)) {        /* 20ms */
 538                 printk("%s: timeout waiting for Tx RDC.\n", dev->name);
 539                 apne_reset_8390(dev);
 540                 NS8390_init(dev,1);
 541                 break;
 542         }
 543
 544     outb(ENISR_RDC, nic_base + NE_EN0_ISR);     /* Ack intr. */
 545     ei_status.dmaing &= ~0x01;
 546     return;
 547 }
 548
 549 static irqreturn_t apne_interrupt(int irq, void *dev_id)
 550 {
 551     unsigned char pcmcia_intreq;
 552
 553     if (!(gayle.inten & GAYLE_IRQ_IRQ))
 554         return IRQ_NONE;
 555
 556     pcmcia_intreq = pcmcia_get_intreq();
 557
 558     if (!(pcmcia_intreq & GAYLE_IRQ_IRQ)) {
 559         pcmcia_ack_int(pcmcia_intreq);
 560         return IRQ_NONE;
 561     }
 562     if (ei_debug > 3)
 563         printk("pcmcia intreq = %x\n", pcmcia_intreq);
 564     pcmcia_disable_irq();                       /* to get rid of the sti() within ei_interrupt */
 565     ei_interrupt(irq, dev_id);
 566     pcmcia_ack_int(pcmcia_get_intreq());
 567     pcmcia_enable_irq();
 568     return IRQ_HANDLED;
 569 }
 570
 571 #ifdef MODULE
 572 static struct net_device *apne_dev;
 573
 574 static int __init apne_module_init(void)
 575 {
 576         apne_dev = apne_probe(-1);
 577         if (IS_ERR(apne_dev))
 578                 return PTR_ERR(apne_dev);
 579         return 0;
 580 }
 581
 582 static void __exit apne_module_exit(void)
 583 {
 584         unregister_netdev(apne_dev);
 585
 586         pcmcia_disable_irq();
 587
 588         free_irq(IRQ_AMIGA_PORTS, apne_dev);
 589
 590         pcmcia_reset();
 591
 592         release_region(IOBASE, 0x20);
 593
 594         free_netdev(apne_dev);
 595 }
 596 module_init(apne_module_init);
 597 module_exit(apne_module_exit);
 598 #endif
 599
 600 static int init_pcmcia(void)
 601 {
 602         u_char config;
 603 #ifndef MANUAL_CONFIG
 604         u_char tuple[32];
 605         int offset_len;
 606 #endif
 607         u_long offset;
 608
 609         pcmcia_reset();
 610         pcmcia_program_voltage(PCMCIA_0V);
 611         pcmcia_access_speed(PCMCIA_SPEED_250NS);
 612         pcmcia_write_enable();
 613
 614 #ifdef MANUAL_CONFIG
 615         config = MANUAL_CONFIG;
 616 #else
 617         /* get and write config byte to enable IO port */
 618
 619         if (pcmcia_copy_tuple(CISTPL_CFTABLE_ENTRY, tuple, 32) < 3)
 620                 return 0;
 621
 622         config = tuple[2] & 0x3f;
 623 #endif
 624 #ifdef MANUAL_OFFSET
 625         offset = MANUAL_OFFSET;
 626 #else
 627         if (pcmcia_copy_tuple(CISTPL_CONFIG, tuple, 32) < 6)
 628                 return 0;
 629
 630         offset_len = (tuple[2] & 0x3) + 1;
 631         offset = 0;
 632         while(offset_len--) {
 633                 offset = (offset << 8) | tuple[4+offset_len];
 634         }
 635 #endif
 636
 637         out_8(GAYLE_ATTRIBUTE+offset, config);
 638
 639         return 1;
 640 }
 641
 642 MODULE_LICENSE("GPL");