net/inet/el2.c

/* */
This source file includes following definitions.
el2autoprobe
el2_pio_autoprobe
el2probe
el2_open
el2_close
el2_reset_8390
el2_init_card
el2_block_output
el2_block_input
   1 /* el2.c: A shared-memory NS8390 ethernet driver for linux. */
   2 /*
   3     Written 1992,1993 by Donald Becker.
   4 
   5     Copyright 1993 United States Government as represented by the
   6     Director, National Security Agency.  This software may be used and
   7     distributed according to the terms of the GNU Public License,
   8     incorporated herein by reference.
   9 
  10     This driver should work with the 3c503 and 3c503/16.  It should be used
  11     in shared memory mode for best performance, although it may also work
  12     in programmed-I/O mode.
  13 
  14     The Author may be reached as becker@super.org or
  15     C/O Supercomputing Research Ctr., 17100 Science Dr., Bowie MD 20715
  16 */
  17 
  18 static char *version =
  19     "el2.c:v0.99.12B 8/12/93 Donald Becker (becker@super.org)\n";
  20 
  21 #include <linux/config.h>
  22 #include <linux/kernel.h>
  23 #include <linux/sched.h>
  24 #include <linux/errno.h>
  25 #include <asm/io.h>
  26 #include <asm/system.h>
  27 
  28 #include "dev.h"
  29 
  30 #include "8390.h"
  31 #include "el2reg.h"
  32 
  33 int el2autoprobe(int ioaddr, struct device *dev);
  34 int el2_pio_autoprobe(struct device *dev);
  35 int el2probe(int ioaddr, struct device *dev);
  36 
  37 static int el2_open(struct device *dev);
  38 static int el2_close(struct device *dev);
  39 static void el2_reset_8390(struct device *dev);
  40 static void el2_init_card(struct device *dev);
  41 static void el2_block_output(struct device *dev, int count,
  42                              const unsigned char *buf, const start_page);
  43 static int el2_block_input(struct device *dev, int count, char *buf,
  44                            int ring_offset);
  45 
  46 
  47 /* This routine probes for a memory-mapped 3c503 board by looking for
  48    the "location register" at the end of the jumpered boot PROM space.
  49    This works even if a PROM isn't there.
  50 
  51    If the ethercard isn't found there is an optional probe for
  52    ethercard jumpered to programmed-I/O mode.
  53    */
  54 
  55 static int ports[] = {0x300,0x310,0x330,0x350,0x250,0x280,0x2a0,0x2e0,0};
  56 
  57 int
  58 el2autoprobe(int ioaddr, struct device *dev)
     /*  */
  59 {
  60     int *addr, addrs[] = { 0xddffe, 0xd9ffe, 0xcdffe, 0xc9ffe, 0};
  61 
  62     /* Non-autoprobe case first: */
  63     if (ioaddr > 0)
  64         return el2probe(ioaddr, dev);
  65 
  66     for (addr = addrs; *addr; addr++) {
  67         int i;
  68         unsigned int base_bits = *(unsigned char *)*addr;
  69         /* Find first set bit. */
  70         for(i = 7; i >= 0; i--, base_bits >>= 1)
  71             if (base_bits & 0x1)
  72                 break;
  73         if (base_bits == 1 &&  el2probe(ports[i], dev))
  74             return dev->base_addr;
  75     }
  76 #ifdef probe_nonshared_memory
  77     return el2_pio_autoprobe(dev);
  78 #else
  79     return 0;
  80 #endif
  81 }
  82 
  83 /*  Try all of the locations that aren't obviously empty.  This touches
  84     a lot of locations, and is much riskier than the code above. */
  85 int
  86 el2_pio_autoprobe(struct device *dev)
     /*  */
  87 {
  88     int i;
  89     for (i = 0; i < 8; i++) {
  90         /* Reset and/or avoid any lurking NE2000 */
  91         if (inb_p(ports[i] + 0x408) == 0xff)
  92             continue;
  93         if (inb(ports[i] + 0x403) == (0x80 >> i) /* Preliminary check */
  94             && el2probe(ports[i], dev))
  95             return dev->base_addr;
  96     }
  97     return 0;
  98 }
  99 
 100 /* Probe for the Etherlink II card at I/O port base IOADDR,
 101    returning non-zero on sucess.  If found, set the station
 102    address and memory parameters in DEVICE. */
 103 int
 104 el2probe(int ioaddr, struct device *dev)
     /*  */
 105 {
 106     int i, iobase_reg, membase_reg, saved_406;
 107     unsigned char *station_addr = dev->dev_addr;
 108 
 109     /* We verify that it's a 3C503 board by checking the first three octets
 110        of its ethernet address. */
 111     printk("3c503 probe at %#3x:", ioaddr);
 112     iobase_reg = inb(ioaddr+0x403);
 113     membase_reg = inb(ioaddr+0x404);
 114     /* Verify ASIC register that should be 0 or have a single bit set. */
 115     if (   (iobase_reg  & (iobase_reg - 1))
 116         || (membase_reg & (membase_reg - 1))) {
 117         printk("  not found.\n");
 118         return 0;
 119     }
 120     saved_406 = inb_p(ioaddr + 0x406);
 121     outb_p(ECNTRL_RESET|ECNTRL_THIN, ioaddr + 0x406); /* Reset it... */
 122     outb_p(ECNTRL_THIN, ioaddr + 0x406);
 123     /* Map the station addr PROM into the lower I/O ports. */
 124     outb(ECNTRL_SAPROM|ECNTRL_THIN, ioaddr + 0x406);
 125     for (i = 0; i < ETHER_ADDR_LEN; i++) {
 126         printk(" %2.2X", (station_addr[i] = inb(ioaddr + i)));
 127     }
 128     if ( station_addr[0] != 0x02
 129         || station_addr[1] != 0x60
 130         || station_addr[2] != 0x8c) {
 131         printk("  3C503 not found.\n");
 132         /* Restore the register we frobbed. */
 133         outb(saved_406, ioaddr + 0x406);
 134         return 0;
 135     }
 136 
 137     ethdev_init(dev);
 138 
 139     /* Map the 8390 back into the window. */
 140     outb(ECNTRL_THIN, ioaddr + 0x406);
 141     dev->base_addr = ioaddr;
 142     /* Probe for, turn on and clear the board's shared memory. */
 143     if (ei_debug > 2) printk(" memory jumpers %2.2x ", membase_reg);
 144     outb(EGACFR_NORM, ioaddr + 0x405);  /* Enable RAM */
 145 
 146     /* This should be probed for (or set via an ioctl()) at run-time.
 147        Right now we use a sleazy hack to pass in the interface number
 148        at boot-time via the low bits of the mem_end field.  That value is
 149        unused, and the low bits would be discarded even if it was used. */
 150 #if defined(EI8390_THICK) || defined(EL2_AUI)
 151     ei_status.interface_num = 1;
 152 #else
 153     ei_status.interface_num = dev->mem_end & 0xf;
 154 #endif
 155 
 156     if ((membase_reg & 0xf0) == 0) {
 157         dev->mem_start = 0;
 158     } else {
 159         dev->mem_start = ((membase_reg & 0xc0) ? 0xD8000 : 0xC8000) +
 160             ((membase_reg & 0xA0) ? 0x4000 : 0);
 161 
 162 #define EL2_MEMSIZE (EL2SM_STOP_PG - EL2SM_START_PG)*256
 163 #ifdef EL2MEMTEST
 164         /* This has never found an error, but someone might care. */
 165         {                       /* Check the card's memory. */
 166             int *mem_base = (int *)dev->mem_start;
 167             int memtest_value = 0xbbadf00d;
 168             mem_base[0] = 0xba5eba5e;
 169             for (i = 1; i < EL2_MEMSIZE/sizeof(mem_base[0]); i++) {
 170                 mem_base[i] = memtest_value;
 171                 if (mem_base[0] != 0xba5eba5e
 172                     || mem_base[i] != memtest_value) {
 173                     printk(" memory failure or memory address conflict.\n");
 174                     dev->mem_start = 0;
 175                     break;
 176                 }
 177                 memtest_value += 0x55555555;
 178                 mem_base[i] = 0;
 179             }
 180         }
 181 #endif  /* EL2MEMTEST */
 182         /* Divide the on-board memory into a single maximum-sized transmit
 183            (double-sized for ping-pong transmit) buffer at the base, and
 184            use the rest as a receive ring. */
 185         dev->mem_end = dev->rmem_end = dev->mem_start + EL2_MEMSIZE;
 186         dev->rmem_start = TX_PAGES*256 + dev->mem_start;
 187     }
 188     if (ei_debug > 2)
 189         printk("\n3c503: memory params start=%#5x rstart=%#5x end=%#5x rend=%#5x.\n",
 190                dev->mem_start, dev->rmem_start, dev->mem_end, dev->rmem_end);
 191 
 192     /* Finish setting the board's parameters. */
 193     ei_status.name = "3C503";
 194     ei_status.tx_start_page = EL2SM_START_PG;
 195     ei_status.rx_start_page = EL2SM_START_PG + TX_PAGES;
 196     ei_status.stop_page = EL2SM_STOP_PG;
 197     ei_status.reset_8390 = &el2_reset_8390;
 198     ei_status.block_input = &el2_block_input;
 199     ei_status.block_output = &el2_block_output;
 200 
 201     if (dev->irq == 2)
 202         dev->irq = 9;
 203     else if (dev->irq > 5 && dev->irq != 9) {
 204         printk("\n3c503: configured interrupt %d invalid, using autoIRQ.\n",
 205                dev->irq);
 206         dev->irq = 0;
 207     }
 208 
 209     ei_status.saved_irq = dev->irq;
 210 
 211     dev->start = 0;
 212     dev->open = &el2_open;
 213     dev->stop = &el2_close;
 214     el2_init_card(dev);
 215 
 216     if (dev->mem_start)
 217         printk("\n%s: %s with shared memory at %#6x-%#6x,\n",
 218                dev->name, ei_status.name, dev->mem_start, dev->mem_end-1);
 219     else
 220         printk("\n%s: %s using programmed I/O (REJUMPER for SHARED MEMORY).\n",
 221                dev->name, ei_status.name);
 222     if (ei_debug > 1)
 223         printk(version);
 224 
 225     return ioaddr;
 226 }
 227 
 228 static int
 229 el2_open(struct device *dev)
     /*  */
 230 {
 231 
 232     if (dev->irq < 2) {
 233         int irqlist[] = {5, 2, 3, 4, 0};
 234         int *irqp = irqlist;
 235 
 236         outb(EGACFR_NORM, E33G_GACFR);  /* Enable RAM and interrupts. */
 237         do {
 238             if (request_irq (*irqp, NULL) != -EBUSY) {
 239                 /* Twinkle the interrupt, and check if it's seen. */
 240                 autoirq_setup(0);
 241                 outb_p(0x04 << *irqp, E33G_IDCFR);
 242                 outb_p(0x00, E33G_IDCFR);
 243                 if (*irqp == autoirq_report(0)   /* It's a good IRQ line! */
 244                     && request_irq (dev->irq = *irqp, &ei_interrupt) == 0)
 245                     break;
 246             }
 247         } while (*++irqp);
 248         if (*irqp == 0) {
 249             outb(EGACFR_IRQOFF, E33G_GACFR);    /* disable interrupts. */
 250             return -EAGAIN;
 251         }
 252     } else {
 253         if (request_irq(dev->irq, &ei_interrupt)) {
 254             return -EAGAIN;
 255         }
 256     }
 257     return ei_open(dev);
 258 }
 259 
 260 static int
 261 el2_close(struct device *dev)
     /*  */
 262 {
 263     free_irq(dev->irq);
 264     dev->irq = ei_status.saved_irq;
 265     irq2dev_map[dev->irq] = NULL;
 266     outb(EGACFR_IRQOFF, E33G_GACFR);    /* disable interrupts. */
 267 
 268     NS8390_init(dev, 0);
 269 
 270     return 0;
 271 }
 272 
 273 /* This is called whenever we have a unrecoverable failure:
 274        transmit timeout
 275        Bad ring buffer packet header
 276  */
 277 static void
 278 el2_reset_8390(struct device *dev)
     /*  */
 279 {
 280     if (ei_debug > 1) {
 281         printk("%s: Resetting the 3c503 board...", dev->name);
 282         printk("%#x=%#02x %#x=%#02x %#x=%#02x...", E33G_IDCFR, inb(E33G_IDCFR),
 283                E33G_CNTRL, inb(E33G_CNTRL), E33G_GACFR, inb(E33G_GACFR));
 284     }
 285     outb_p(ECNTRL_RESET|ECNTRL_THIN, E33G_CNTRL);
 286     ei_status.txing = 0;
 287     outb_p(ei_status.interface_num==0 ? ECNTRL_THIN : ECNTRL_AUI, E33G_CNTRL);
 288     el2_init_card(dev);
 289     if (ei_debug > 1) printk("done\n");
 290 }
 291 
 292 /* Initialize the 3c503 GA registers after a reset. */
 293 static void
 294 el2_init_card(struct device *dev)
     /*  */
 295 {
 296     /* Unmap the station PROM and select the DIX or BNC connector. */
 297     outb_p(ei_status.interface_num==0 ? ECNTRL_THIN : ECNTRL_AUI, E33G_CNTRL);
 298 
 299     /* Set ASIC copy of rx's first and last+1 buffer pages */
 300     /* These must be the same as in the 8390. */
 301     outb(ei_status.rx_start_page, E33G_STARTPG);
 302     outb(ei_status.stop_page,  E33G_STOPPG);
 303 
 304     /* Point the vector pointer registers somewhere ?harmless?. */
 305     outb(0xff, E33G_VP2);       /* Point at the ROM restart location 0xffff0 */
 306     outb(0xff, E33G_VP1);
 307     outb(0x00, E33G_VP0);
 308     /* Turn off all interrupts until we're opened. */
 309     outb_p(0x00,  dev->base_addr + EN0_IMR);
 310     /* Enable IRQs iff started. */
 311     outb(EGACFR_NORM, E33G_GACFR);
 312 
 313     /* Set the interrupt line. */
 314     outb_p((0x04 << (dev->irq == 9 ? 2 : dev->irq)), E33G_IDCFR);
 315     outb_p(8, E33G_DRQCNT);             /* Set burst size to 8 */
 316     outb_p(0x20, E33G_DMAAH);   /* Put a valid addr in the GA DMA */
 317     outb_p(0x00, E33G_DMAAL);
 318     return;                     /* We always succeed */
 319 }
 320 
 321 /* Either use the shared memory (if enabled on the board) or put the packet
 322    out through the ASIC FIFO.  The latter is probably much slower. */
 323 static void
 324 el2_block_output(struct device *dev, int count,
     /*  */
 325                  const unsigned char *buf, const start_page)
 326 {
 327     int i;                              /* Buffer index */
 328     int boguscount = 0;         /* timeout counter */
 329 
 330     /* This should really be set with during an open(). */
 331     outb(EGACFR_NORM, E33G_GACFR);      /* Enable RAM and interrupts. */
 332 
 333     if (dev->mem_start) {       /* Shared memory transfer */
 334         void *dest_addr = (void *)(dev->mem_start +
 335             ((start_page - ei_status.tx_start_page) << 8));
 336         memcpy(dest_addr, buf, count);
 337         if (ei_debug > 2  &&  memcmp(dest_addr, buf, count))
 338             printk("%s: 3c503 send_packet() bad memory copy @ %#5x.\n",
 339                    dev->name, dest_addr);
 340         else if (ei_debug > 4)
 341             printk("%s: 3c503 send_packet() good memory copy @ %#5x.\n",
 342                    dev->name, dest_addr);
 343         return;
 344     }
 345     /* No shared memory, put the packet out the slow way. */
 346     /* Set up then start the internal memory transfer to Tx Start Page */
 347     outb(0x00, E33G_DMAAL);
 348     outb_p(start_page, E33G_DMAAH);
 349     outb_p((ei_status.interface_num ? ECNTRL_AUI : ECNTRL_THIN ) | ECNTRL_OUTPUT
 350            | ECNTRL_START, E33G_CNTRL);
 351 
 352     /* This is the byte copy loop: it should probably be tuned for
 353        for speed once everything is working.  I think it is possible
 354        to output 8 bytes between each check of the status bit. */
 355     for(i = 0; i < count; i++) {
 356         if (i % 8 == 0)
 357             while ((inb(E33G_STATUS) & ESTAT_DPRDY) == 0)
 358                 if (++boguscount > (i<<3) + 32) {
 359                     printk("%s: FIFO blocked in el2_block_output (at %d of %d, bc=%d).\n",
 360                            dev->name, i, count, boguscount);
 361                     return;
 362                 }
 363         outb(buf[i], E33G_FIFOH);
 364     }
 365     outb_p(ei_status.interface_num==0 ? ECNTRL_THIN : ECNTRL_AUI, E33G_CNTRL);
 366     return;
 367 }
 368 
 369 /* Returns the new ring pointer. */
 370 static int
 371 el2_block_input(struct device *dev, int count, char *buf, int ring_offset)
     /*  */
 372 {
 373     int boguscount = 0;
 374     int end_of_ring = dev->rmem_end;
 375     unsigned int i;
 376 
 377     /* Maybe enable shared memory just be to be safe... nahh.*/
 378     if (dev->mem_start) {       /* Use the shared memory. */
 379         ring_offset -= (EL2SM_START_PG<<8);
 380         if (dev->mem_start + ring_offset + count > end_of_ring) {
 381             /* We must wrap the input move. */
 382             int semi_count = end_of_ring - (dev->mem_start + ring_offset);
 383             if (ei_debug > 4)
 384                 printk("%s: 3c503 block_input() @ %#5x+%x=%5x.\n",
 385                        dev->name, dev->mem_start, ring_offset,
 386                        (char *)dev->mem_start + ring_offset);
 387             memcpy(buf, (char *)dev->mem_start + ring_offset, semi_count);
 388             count -= semi_count;
 389             memcpy(buf + semi_count, (char *)dev->rmem_start, count);
 390             return dev->rmem_start + count;
 391         }
 392         if (ei_debug > 4)
 393             printk("%s: 3c503 block_input() @ %#5x+%x=%5x.\n",
 394                    dev->name, dev->mem_start, ring_offset,
 395                    (char *)dev->mem_start + ring_offset);
 396         memcpy(buf, (char *)dev->mem_start + ring_offset, count);
 397         return ring_offset + count;
 398     }
 399     /* No shared memory, use programmed I/O. */
 400     outb(ring_offset & 0xff, E33G_DMAAL);
 401     outb_p((ring_offset >> 8) & 0xff, E33G_DMAAH);
 402     outb_p((ei_status.interface_num == 0 ? ECNTRL_THIN : ECNTRL_AUI) | ECNTRL_INPUT
 403            | ECNTRL_START, E33G_CNTRL);
 404 
 405     /* This is the byte copy loop: it should probably be tuned for
 406        for speed once everything is working. */
 407     for(i = 0; i < count; i++) {
 408         if (i % 8 == 0)
 409             while ((inb(E33G_STATUS) & ESTAT_DPRDY) == 0)
 410                 if (++boguscount > (i<<3) + 32) {
 411                     printk("%s: FIFO blocked in el2_block_input() (at %d of %d, bc=%d).\n",
 412                            dev->name, i, count, boguscount);
 413                     boguscount = 0;
 414                     break;
 415                 }
 416         buf[i] = inb_p(E33G_FIFOH);
 417     }
 418     outb_p(ei_status.interface_num == 0 ? ECNTRL_THIN : ECNTRL_AUI, E33G_CNTRL);
 419     return 0;
 420 }
 421 
 422 /*
 423  * Local variables:
 424  *  compile-command: "gcc -DKERNEL -Wall -O6 -fomit-frame-pointer -I/usr/src/linux/net/tcp -c 3c503.c"
 425  *  version-control: t
 426  *  kept-new-versions: 5
 427  * End:
 428  */
/* */
root/net/inet/el2.c

DEFINITIONS
