root/drivers/net/e2100.c

/* [previous][next][first][last][top][bottom][index][help] */

DEFINITIONS

This source file includes following definitions.
  1. mem_on
  2. mem_off
  3. e2100_probe
  4. e21_probe1
  5. e21_open
  6. e21_reset_8390
  7. e21_block_input
  8. e21_block_output
  9. e21_close

   1 /* e2100.c: A Cabletron E2100 series ethernet driver for linux. */
   2 /*
   3         Written 1993-1994 by Donald Becker.
   4 
   5         Copyright 1994 by Donald Becker.
   6         Copyright 1993 United States Government as represented by the
   7         Director, National Security Agency.  This software may be used and
   8         distributed according to the terms of the GNU Public License,
   9         incorporated herein by reference.
  10 
  11         This is a driver for the Cabletron E2100 series ethercards.
  12 
  13         The Author may be reached as becker@cesdis.gsfc.nasa.gov, or
  14         C/O Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771
  15 
  16         The E2100 series ethercard is a fairly generic shared memory 8390
  17         implementation.  The only unusual aspect is the way the shared memory
  18         registers are set: first you do an inb() in what is normally the
  19         station address region, and the low three bits of next outb() *address*
  20         is used as the write value for that register.  Either someone wasn't
  21         too used to dem bit en bites, or they were trying to obfuscate the
  22         programming     interface.
  23 
  24         There is an additional complication when setting the window on the packet
  25         buffer.  You must first do a read into the packet buffer region with the
  26         low 8 address bits the address setting the page for the start of the packet
  27         buffer window, and then do the above operation.  See mem_on() for details.
  28 
  29         One bug on the chip is that even a hard reset won't disable the memory
  30         window, usually resulting in a hung machine if mem_off() isn't called.
  31         If this happens, you must power down the machine for about 30 seconds.
  32 */
  33 
  34 static char *version =
  35         "e2100.c:v1.01 7/21/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";
  36 
  37 #include <linux/kernel.h>
  38 #include <linux/sched.h>
  39 #include <linux/errno.h>
  40 #include <linux/string.h>
  41 #include <asm/io.h>
  42 #include <asm/system.h>
  43 #include <linux/ioport.h>
  44 
  45 #include <linux/netdevice.h>
  46 #include "8390.h"
  47 
  48 static int e21_probe_list[] = {0x300, 0x280, 0x380, 0x220, 0};
  49 
  50 /* Offsets from the base_addr.
  51    Read from the ASIC register, and the low three bits of the next outb()
  52    address is used to set the corresponding register. */
  53 #define E21_NIC_OFFSET  0               /* Offset to the 8390 NIC. */
  54 #define E21_ASIC                0x10
  55 #define E21_MEM_ENABLE  0x10
  56 #define  E21_MEM_ON             0x05    /* Enable memory in 16 bit mode. */
  57 #define  E21_MEM_ON_8   0x07    /* Enable memory in  8 bit mode. */
  58 #define E21_MEM_BASE    0x11    
  59 #define E21_IRQ_LOW             0x12    /* The low three bits of the IRQ number. */
  60 #define E21_IRQ_HIGH    0x14    /* The high IRQ bit and media select ...  */
  61 #define E21_MEDIA               0x14    /* (alias). */
  62 #define  E21_ALT_IFPORT 0x02    /* Set to use the other (BNC,AUI) port. */
  63 #define  E21_BIG_MEM    0x04    /* Use a bigger (64K) buffer (we don't) */
  64 #define E21_SAPROM              0x10    /* Offset to station address data. */
  65 #define E21_IO_EXTENT    0x20
  66 
  67 extern inline void mem_on(short port, volatile char *mem_base,
     /* [previous][next][first][last][top][bottom][index][help] */
  68                                                   unsigned char start_page )
  69 {
  70         /* This is a little weird: set the shared memory window by doing a
  71            read.  The low address bits specify the starting page. */
  72         mem_base[start_page];
  73         inb(port + E21_MEM_ENABLE);
  74         outb(E21_MEM_ON, port + E21_MEM_ENABLE + E21_MEM_ON);
  75 }
  76 
  77 extern inline void mem_off(short port)
     /* [previous][next][first][last][top][bottom][index][help] */
  78 {
  79         inb(port + E21_MEM_ENABLE);
  80         outb(0x00, port + E21_MEM_ENABLE);
  81 }
  82 
  83 /* In other drivers I put the TX pages first, but the E2100 window circuitry
  84    is designed to have a 4K Tx region last. The windowing circuitry wraps the
  85    window at 0x2fff->0x0000 so that the packets at e.g. 0x2f00 in the RX ring
  86    appear contiguously in the window. */
  87 #define E21_RX_START_PG         0x00    /* First page of RX buffer */
  88 #define E21_RX_STOP_PG          0x30    /* Last page +1 of RX ring */
  89 #define E21_BIG_RX_STOP_PG      0xF0    /* Last page +1 of RX ring */
  90 #define E21_TX_START_PG         E21_RX_STOP_PG  /* First page of TX buffer */
  91 
  92 int e2100_probe(struct device *dev);
  93 int e21_probe1(struct device *dev, int ioaddr);
  94 
  95 static int e21_open(struct device *dev);
  96 static void e21_reset_8390(struct device *dev);
  97 static int e21_block_input(struct device *dev, int count,
  98                                                    char *buf, int ring_offset);
  99 static void e21_block_output(struct device *dev, int count,
 100                                                          const unsigned char *buf, const start_page);
 101 static int e21_close(struct device *dev);
 102 
 103 
 104 /*  Probe for the E2100 series ethercards.  These cards have an 8390 at the
 105         base address and the station address at both offset 0x10 and 0x18.  I read
 106         the station address from offset 0x18 to avoid the dataport of NE2000
 107         ethercards, and look for Ctron's unique ID (first three octets of the
 108         station address).
 109  */
 110 
 111 int e2100_probe(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 112 {
 113         int *port;
 114         int base_addr = dev->base_addr;
 115 
 116         if (base_addr > 0x1ff)          /* Check a single specified location. */
 117                 return e21_probe1(dev, base_addr);
 118         else if (base_addr != 0)        /* Don't probe at all. */
 119                 return ENXIO;
 120 
 121         for (port = e21_probe_list; *port; port++) {
 122                 if (check_region(*port, E21_IO_EXTENT))
 123                         continue;
 124                 if (e21_probe1(dev, *port) == 0)
 125                         return 0;
 126         }
 127 
 128         return ENODEV;
 129 }
 130 
 131 int e21_probe1(struct device *dev, int ioaddr)
     /* [previous][next][first][last][top][bottom][index][help] */
 132 {
 133         int i, status;
 134         unsigned char *station_addr = dev->dev_addr;
 135 
 136         /* First check the station address for the Ctron prefix. */
 137         if (inb(ioaddr + E21_SAPROM + 0) != 0x00
 138                 || inb(ioaddr + E21_SAPROM + 1) != 0x00
 139                 || inb(ioaddr + E21_SAPROM + 2) != 0x1d)
 140                 return ENODEV;
 141 
 142         /* Verify by making certain that there is a 8390 at there. */
 143         outb(E8390_NODMA + E8390_STOP, ioaddr);
 144         SLOW_DOWN_IO;
 145         status = inb(ioaddr);
 146         if (status != 0x21 && status != 0x23)
 147                 return ENODEV;
 148 
 149         /* Grab the region so we can find a different board if IRQ select fails. */
 150         request_region(ioaddr, E21_IO_EXTENT,"e2100");
 151 
 152         /* Read the station address PROM.  */
 153         for (i = 0; i < 6; i++)
 154                 station_addr[i] = inb(ioaddr + E21_SAPROM + i);
 155 
 156         inb(ioaddr + E21_MEDIA);                /* Point to media selection. */
 157         outb(0, ioaddr + E21_ASIC);     /* and disable the secondary interface. */
 158 
 159         printk("%s: E21** at %#3x,", dev->name, ioaddr);
 160         for (i = 0; i < 6; i++)
 161                 printk(" %02X", station_addr[i]);
 162 
 163         if (dev->irq < 2) {
 164                 int irqlist[] = {15,11,10,12,5,9,3,4}, i;
 165                 for (i = 0; i < 8; i++)
 166                         if (request_irq (irqlist[i], NULL, 0, "bogus") != -EBUSY) {
 167                                 dev->irq = irqlist[i];
 168                                 break;
 169                         }
 170                 if (i >= 8) {
 171                         printk(" unable to get IRQ %d.\n", dev->irq);
 172                         return EAGAIN;
 173                 }
 174         } else if (dev->irq == 2)       /* Fixup luser bogosity: IRQ2 is really IRQ9 */
 175                 dev->irq = 9;
 176 
 177         /* The 8390 is at the base address. */
 178         dev->base_addr = ioaddr;
 179 
 180         ethdev_init(dev);
 181 
 182         ei_status.name = "E2100";
 183         ei_status.word16 = 1;
 184         ei_status.tx_start_page = E21_TX_START_PG;
 185         ei_status.rx_start_page = E21_RX_START_PG;
 186         ei_status.stop_page = E21_RX_STOP_PG;
 187     ei_status.saved_irq = dev->irq;
 188 
 189         /* Check the media port used.  The port can be passed in on the
 190            low mem_end bits. */
 191         if (dev->mem_end & 15)
 192                 dev->if_port = dev->mem_end & 7;
 193         else {
 194                 dev->if_port = 0;
 195                 inb(ioaddr + E21_MEDIA);        /* Turn automatic media detection on. */
 196                 for(i = 0; i < 6; i++)
 197                         if (station_addr[i] != inb(ioaddr + E21_SAPROM + 8 + i)) {
 198                                 dev->if_port = 1;
 199                                 break;
 200                         }
 201         }
 202 
 203         /* Never map in the E21 shared memory unless you are actively using it.
 204            Also, the shared memory has effective only one setting -- spread all
 205            over the 128K region! */
 206         if (dev->mem_start == 0)
 207                 dev->mem_start = 0xd0000;
 208         
 209 #ifdef notdef
 210         /* These values are unused.  The E2100 has a 2K window into the packet
 211            buffer.  The window can be set to start on any page boundary. */
 212         dev->rmem_start = dev->mem_start + TX_PAGES*256;
 213         dev->mem_end = dev->rmem_end = dev->mem_start + 2*1024;
 214 #endif
 215 
 216         printk(", IRQ %d, %s media, memory @ %#lx.\n", dev->irq,
 217                    dev->if_port ? "secondary" : "primary", dev->mem_start);
 218 
 219         if (ei_debug > 0)
 220                 printk(version);
 221 
 222         ei_status.reset_8390 = &e21_reset_8390;
 223         ei_status.block_input = &e21_block_input;
 224         ei_status.block_output = &e21_block_output;
 225         dev->open = &e21_open;
 226         dev->stop = &e21_close;
 227         NS8390_init(dev, 0);
 228 
 229         return 0;
 230 }
 231 
 232 static int
 233 e21_open(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 234 {
 235         short ioaddr = dev->base_addr;
 236 
 237         if (request_irq(dev->irq, ei_interrupt, 0, "e2100")) {
 238                 return EBUSY;
 239         }
 240         irq2dev_map[dev->irq] = dev;
 241 
 242         /* Set the interrupt line and memory base on the hardware. */
 243         inb(ioaddr + E21_IRQ_LOW);
 244         outb(0, ioaddr + E21_ASIC + (dev->irq & 7));
 245         inb(ioaddr + E21_IRQ_HIGH);                     /* High IRQ bit, and if_port. */
 246         outb(0, ioaddr + E21_ASIC + (dev->irq > 7 ? 1:0)
 247                    + (dev->if_port ? E21_ALT_IFPORT : 0));
 248         inb(ioaddr + E21_MEM_BASE);
 249         outb(0, ioaddr + E21_ASIC + ((dev->mem_start >> 17) & 7));
 250 
 251         return ei_open(dev);
 252 }
 253 
 254 static void
 255 e21_reset_8390(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 256 {
 257         short ioaddr = dev->base_addr;
 258 
 259         outb(0x01, ioaddr);
 260         if (ei_debug > 1) printk("resetting the E2180x3 t=%ld...", jiffies);
 261         ei_status.txing = 0;
 262 
 263         /* Set up the ASIC registers, just in case something changed them. */
 264 
 265         if (ei_debug > 1) printk("reset done\n");
 266         return;
 267 }
 268 
 269 /*  Block input and output are easy on shared memory ethercards.
 270         The E21xx makes block_input() especially easy by wrapping the top
 271         ring buffer to the bottom automatically. */
 272 static int
 273 e21_block_input(struct device *dev, int count, char *buf, int ring_offset)
     /* [previous][next][first][last][top][bottom][index][help] */
 274 {
 275         short ioaddr = dev->base_addr;
 276         char *shared_mem = (char *)dev->mem_start;
 277         int start_page = (ring_offset>>8);
 278 
 279         mem_on(ioaddr, shared_mem, start_page);
 280 
 281         /* We'll always get a 4 byte header read first. */
 282         if (count == 4)
 283                 ((int*)buf)[0] = ((int*)shared_mem)[0];
 284         else
 285                 memcpy(buf, shared_mem + (ring_offset & 0xff), count);
 286 
 287         /* Turn off memory access: we would need to reprogram the window anyway. */
 288         mem_off(ioaddr);
 289 
 290         return 0;
 291 }
 292 
 293 static void
 294 e21_block_output(struct device *dev, int count, const unsigned char *buf,
     /* [previous][next][first][last][top][bottom][index][help] */
 295                                  int start_page)
 296 {
 297         short ioaddr = dev->base_addr;
 298         volatile char *shared_mem = (char *)dev->mem_start;
 299 
 300         /* Set the shared memory window start by doing a read, with the low address
 301            bits specifying the starting page. */
 302         *(shared_mem + start_page);
 303         mem_on(ioaddr, shared_mem, start_page);
 304 
 305         memcpy((char*)shared_mem, buf, count);
 306         mem_off(ioaddr);
 307 }
 308 
 309 static int
 310 e21_close(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 311 {
 312         short ioaddr = dev->base_addr;
 313 
 314         if (ei_debug > 1)
 315                 printk("%s: Shutting down ethercard.\n", dev->name);
 316 
 317     free_irq(dev->irq);
 318     dev->irq = ei_status.saved_irq;
 319 
 320         /* Shut off the interrupt line and secondary interface. */
 321         inb(ioaddr + E21_IRQ_LOW);
 322         outb(0, ioaddr + E21_ASIC);
 323         inb(ioaddr + E21_IRQ_HIGH);                     /* High IRQ bit, and if_port. */
 324         outb(0, ioaddr + E21_ASIC);
 325 
 326     irq2dev_map[dev->irq] = NULL;
 327 
 328         NS8390_init(dev, 0);
 329 
 330         /* Double-check that the memory has been turned off, because really
 331            really bad things happen if it isn't. */
 332         mem_off(ioaddr);
 333 
 334         return 0;
 335 }
 336 
 337 #ifdef HAVE_DEVLIST
 338 struct netdev_entry e21_drv =
 339 {"e21", e21_probe1, E21_IO_EXTENT, e21_probe_list};
 340 #endif
 341 
 342 
 343 /*
 344  * Local variables:
 345  *  compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -m486 -c e2100.c"
 346  *  version-control: t
 347  *  tab-width: 4
 348  *  kept-new-versions: 5
 349  * End:
 350  */

/* [previous][next][first][last][top][bottom][index][help] */