drivers/net/smc-ultra.c

/* */
This source file includes following definitions.
ultra_probe
ultra_probe1
ultra_open
ultra_reset_8390
ultra_get_8390_hdr
ultra_block_input
ultra_block_output
ultra_close_card
init_module
cleanup_module
   1 /* smc-ultra.c: A SMC Ultra ethernet driver for linux. */
   2 /*
   3         Written 1993,1994,1995 by Donald Becker.
   4 
   5         Copyright 1993 United States Government as represented by the
   6         Director, National Security Agency.
   7 
   8         This software may be used and distributed according to the terms
   9         of the GNU Public License, incorporated herein by reference.
  10 
  11         The author may be reached as becker@CESDIS.gsfc.nasa.gov, or C/O
  12         Center of Excellence in Space Data and Information Sciences
  13                 Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771
  14 
  15         This is a driver for the SMC Ultra and SMC EtherEZ ethercards.
  16 
  17         This driver uses the cards in the 8390-compatible, shared memory mode.
  18         Most of the run-time complexity is handled by the generic code in
  19         8390.c.  The code in this file is responsible for
  20 
  21                 ultra_probe()           Detecting and initializing the card.
  22                 ultra_probe1()  
  23 
  24                 ultra_open()            The card-specific details of starting, stopping
  25                 ultra_reset_8390()      and resetting the 8390 NIC core.
  26                 ultra_close()
  27 
  28                 ultra_block_input()             Routines for reading and writing blocks of
  29                 ultra_block_output()    packet buffer memory.
  30 
  31         This driver enables the shared memory only when doing the actual data
  32         transfers to avoid a bug in early version of the card that corrupted
  33         data transferred by a AHA1542.
  34 
  35         This driver does not support the programmed-I/O data transfer mode of
  36         the EtherEZ.  That support (if available) is smc-ez.c.  Nor does it
  37         use the non-8390-compatible "Altego" mode. (No support currently planned.)
  38 */
  39 
  40 static const char *version =
  41         "smc-ultra.c:v1.12 1/18/95 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";
  42 
  43 
  44 #include <linux/module.h>
  45 
  46 #include <linux/kernel.h>
  47 #include <linux/sched.h>
  48 #include <linux/errno.h>
  49 #include <linux/string.h>
  50 #include <asm/io.h>
  51 #include <asm/system.h>
  52 
  53 #include <linux/netdevice.h>
  54 #include <linux/etherdevice.h>
  55 #include "8390.h"
  56 
  57 /* A zero-terminated list of I/O addresses to be probed. */
  58 static unsigned int ultra_portlist[] =
  59 {0x200, 0x220, 0x240, 0x280, 0x300, 0x340, 0x380, 0};
  60 
  61 int ultra_probe(struct device *dev);
  62 int ultra_probe1(struct device *dev, int ioaddr);
  63 
  64 static int ultra_open(struct device *dev);
  65 static void ultra_reset_8390(struct device *dev);
  66 static void ultra_get_8390_hdr(struct device *dev, struct e8390_pkt_hdr *hdr, 
  67                                                 int ring_page);
  68 static void ultra_block_input(struct device *dev, int count,
  69                                                   struct sk_buff *skb, int ring_offset);
  70 static void ultra_block_output(struct device *dev, int count,
  71                                                         const unsigned char *buf, const start_page);
  72 static int ultra_close_card(struct device *dev);
  73 
  74 
  75 #define START_PG                0x00    /* First page of TX buffer */
  76 
  77 #define ULTRA_CMDREG    0               /* Offset to ASIC command register. */
  78 #define  ULTRA_RESET    0x80    /* Board reset, in ULTRA_CMDREG. */
  79 #define  ULTRA_MEMENB   0x40    /* Enable the shared memory. */
  80 #define ULTRA_NIC_OFFSET  16    /* NIC register offset from the base_addr. */
  81 #define ULTRA_IO_EXTENT 32
  82 
  83 /*      Probe for the Ultra.  This looks like a 8013 with the station
  84         address PROM at I/O ports <base>+8 to <base>+13, with a checksum
  85         following.
  86 */
  87 #ifdef HAVE_DEVLIST
  88 struct netdev_entry ultra_drv =
  89 {"ultra", ultra_probe1, NETCARD_IO_EXTENT, netcard_portlist};
  90 #else
  91 
  92 int ultra_probe(struct device *dev)
     /*  */
  93 {
  94         int i;
  95         int base_addr = dev ? dev->base_addr : 0;
  96 
  97         if (base_addr > 0x1ff)          /* Check a single specified location. */
  98                 return ultra_probe1(dev, base_addr);
  99         else if (base_addr != 0)        /* Don't probe at all. */
 100                 return ENXIO;
 101 
 102         for (i = 0; ultra_portlist[i]; i++) {
 103                 int ioaddr = ultra_portlist[i];
 104                 if (check_region(ioaddr, ULTRA_IO_EXTENT))
 105                         continue;
 106                 if (ultra_probe1(dev, ioaddr) == 0)
 107                         return 0;
 108         }
 109 
 110         return ENODEV;
 111 }
 112 #endif
 113 
 114 int ultra_probe1(struct device *dev, int ioaddr)
     /*  */
 115 {
 116         int i;
 117         int checksum = 0;
 118         const char *model_name;
 119         unsigned char eeprom_irq = 0;
 120         /* Values from various config regs. */
 121         unsigned char num_pages, irqreg, addr;
 122         unsigned char idreg = inb(ioaddr + 7);
 123         unsigned char reg4 = inb(ioaddr + 4) & 0x7f;
 124 
 125         /* Check the ID nibble. */
 126         if ((idreg & 0xF0) != 0x20                      /* SMC Ultra */
 127                 && (idreg & 0xF0) != 0x40)              /* SMC EtherEZ */
 128                 return ENODEV;
 129 
 130         /* Select the station address register set. */
 131         outb(reg4, ioaddr + 4);
 132 
 133         for (i = 0; i < 8; i++)
 134                 checksum += inb(ioaddr + 8 + i);
 135         if ((checksum & 0xff) != 0xFF)
 136                 return ENODEV;
 137 
 138         if (dev == NULL)
 139                 dev = init_etherdev(0, sizeof(struct ei_device));
 140         if (dev == NULL) /* Still.. */
 141                 return ENOMEM; /* Out of memory ?? */
 142 
 143         model_name = (idreg & 0xF0) == 0x20 ? "SMC Ultra" : "SMC EtherEZ";
 144 
 145         printk("%s: %s at %#3x,", dev->name, model_name, ioaddr);
 146 
 147         for (i = 0; i < 6; i++)
 148                 printk(" %2.2X", dev->dev_addr[i] = inb(ioaddr + 8 + i));
 149 
 150         /* Switch from the station address to the alternate register set and
 151            read the useful registers there. */
 152         outb(0x80 | reg4, ioaddr + 4);
 153 
 154         /* Enabled FINE16 mode to avoid BIOS ROM width mismatches @ reboot. */
 155         outb(0x80 | inb(ioaddr + 0x0c), ioaddr + 0x0c);
 156         irqreg = inb(ioaddr + 0xd);
 157         addr = inb(ioaddr + 0xb);
 158 
 159         /* Switch back to the station address register set so that the MS-DOS driver
 160            can find the card after a warm boot. */
 161         outb(reg4, ioaddr + 4);
 162 
 163         if (dev->irq < 2) {
 164                 unsigned char irqmap[] = {0, 9, 3, 5, 7, 10, 11, 15};
 165                 int irq;
 166 
 167                 /* The IRQ bits are split. */
 168                 irq = irqmap[((irqreg & 0x40) >> 4) + ((irqreg & 0x0c) >> 2)];
 169 
 170                 if (irq == 0) {
 171                         printk(", failed to detect IRQ line.\n");
 172                         return -EAGAIN;
 173                 }
 174                 dev->irq = irq;
 175                 eeprom_irq = 1;
 176         }
 177 
 178 
 179         /* OK, we are certain this is going to work.  Setup the device. */
 180         request_region(ioaddr, ULTRA_IO_EXTENT, model_name);
 181 
 182         /* The 8390 isn't at the base address, so fake the offset */
 183         dev->base_addr = ioaddr+ULTRA_NIC_OFFSET;
 184 
 185         {
 186                 int addr_tbl[4] = {0x0C0000, 0x0E0000, 0xFC0000, 0xFE0000};
 187                 short num_pages_tbl[4] = {0x20, 0x40, 0x80, 0xff};
 188 
 189                 dev->mem_start = ((addr & 0x0f) << 13) + addr_tbl[(addr >> 6) & 3] ;
 190                 num_pages = num_pages_tbl[(addr >> 4) & 3];
 191         }
 192 
 193         ethdev_init(dev);
 194 
 195         ei_status.name = model_name;
 196         ei_status.word16 = 1;
 197         ei_status.tx_start_page = START_PG;
 198         ei_status.rx_start_page = START_PG + TX_PAGES;
 199         ei_status.stop_page = num_pages;
 200 
 201         dev->rmem_start = dev->mem_start + TX_PAGES*256;
 202         dev->mem_end = dev->rmem_end
 203                 = dev->mem_start + (ei_status.stop_page - START_PG)*256;
 204 
 205         printk(",%s IRQ %d memory %#lx-%#lx.\n", eeprom_irq ? "" : "assigned ",
 206                    dev->irq, dev->mem_start, dev->mem_end-1);
 207         if (ei_debug > 0)
 208                 printk(version);
 209 
 210         ei_status.reset_8390 = &ultra_reset_8390;
 211         ei_status.block_input = &ultra_block_input;
 212         ei_status.block_output = &ultra_block_output;
 213         ei_status.get_8390_hdr = &ultra_get_8390_hdr;
 214         dev->open = &ultra_open;
 215         dev->stop = &ultra_close_card;
 216         NS8390_init(dev, 0);
 217 
 218         return 0;
 219 }
 220 
 221 static int
 222 ultra_open(struct device *dev)
     /*  */
 223 {
 224         int ioaddr = dev->base_addr - ULTRA_NIC_OFFSET; /* ASIC addr */
 225         int rc;
 226 
 227         if (request_irq(dev->irq, ei_interrupt, 0, ei_status.name))
 228                 return -EAGAIN;
 229 
 230         outb(ULTRA_MEMENB, ioaddr);     /* Enable memory, 16 bit mode. */
 231         outb(0x80, ioaddr + 5);
 232         outb(0x01, ioaddr + 6);         /* Enable interrupts and memory. */
 233         rc = ei_open(dev);
 234         if (rc != 0) return rc;
 235         MOD_INC_USE_COUNT;
 236         return 0;
 237 }
 238 
 239 static void
 240 ultra_reset_8390(struct device *dev)
     /*  */
 241 {
 242         int cmd_port = dev->base_addr - ULTRA_NIC_OFFSET; /* ASIC base addr */
 243 
 244         outb(ULTRA_RESET, cmd_port);
 245         if (ei_debug > 1) printk("resetting Ultra, t=%ld...", jiffies);
 246         ei_status.txing = 0;
 247 
 248         outb(ULTRA_MEMENB, cmd_port);
 249 
 250         if (ei_debug > 1) printk("reset done\n");
 251         return;
 252 }
 253 
 254 /* Grab the 8390 specific header. Similar to the block_input routine, but
 255    we don't need to be concerned with ring wrap as the header will be at
 256    the start of a page, so we optimize accordingly. */
 257 
 258 static void
 259 ultra_get_8390_hdr(struct device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
     /*  */
 260 {
 261 
 262         unsigned long hdr_start = dev->mem_start + ((ring_page - START_PG)<<8);
 263 
 264         outb(ULTRA_MEMENB, dev->base_addr - ULTRA_NIC_OFFSET);  /* shmem on */
 265         memcpy_fromio(hdr, hdr_start, sizeof(struct e8390_pkt_hdr));
 266         outb(0x00, dev->base_addr - ULTRA_NIC_OFFSET); /* shmem off */
 267 }
 268 
 269 /* Block input and output are easy on shared memory ethercards, the only
 270    complication is when the ring buffer wraps. */
 271 
 272 static void
 273 ultra_block_input(struct device *dev, int count, struct sk_buff *skb, int ring_offset)
     /*  */
 274 {
 275         unsigned long xfer_start = dev->mem_start + ring_offset - (START_PG<<8);
 276 
 277         /* Enable shared memory. */
 278         outb(ULTRA_MEMENB, dev->base_addr - ULTRA_NIC_OFFSET);
 279 
 280         if (xfer_start + count > dev->rmem_end) {
 281                 /* We must wrap the input move. */
 282                 int semi_count = dev->rmem_end - xfer_start;
 283                 memcpy_fromio(skb->data, xfer_start, semi_count);
 284                 count -= semi_count;
 285                 memcpy_fromio(skb->data + semi_count, dev->rmem_start, count);
 286         } else {
 287                 /* Packet is in one chunk -- we can copy + cksum. */
 288                 eth_io_copy_and_sum(skb, xfer_start, count, 0);
 289         }
 290 
 291         outb(0x00, dev->base_addr - ULTRA_NIC_OFFSET);  /* Disable memory. */
 292 }
 293 
 294 static void
 295 ultra_block_output(struct device *dev, int count, const unsigned char *buf,
     /*  */
 296                                 int start_page)
 297 {
 298         unsigned long shmem = dev->mem_start + ((start_page - START_PG)<<8);
 299 
 300         /* Enable shared memory. */
 301         outb(ULTRA_MEMENB, dev->base_addr - ULTRA_NIC_OFFSET);
 302 
 303         memcpy_toio(shmem, buf, count);
 304 
 305         outb(0x00, dev->base_addr - ULTRA_NIC_OFFSET); /* Disable memory. */
 306 }
 307 
 308 static int
 309 ultra_close_card(struct device *dev)
     /*  */
 310 {
 311         int ioaddr = dev->base_addr - ULTRA_NIC_OFFSET; /* CMDREG */
 312 
 313         dev->start = 0;
 314         dev->tbusy = 1;
 315 
 316         if (ei_debug > 1)
 317                 printk("%s: Shutting down ethercard.\n", dev->name);
 318 
 319         outb(0x00, ioaddr + 6);         /* Disable interrupts. */
 320         free_irq(dev->irq);
 321         irq2dev_map[dev->irq] = 0;
 322 
 323         NS8390_init(dev, 0);
 324 
 325         /* We should someday disable shared memory and change to 8-bit mode
 326            "just in case"... */
 327 
 328         MOD_DEC_USE_COUNT;
 329 
 330         return 0;
 331 }
 332 
 333 #ifdef MODULE
 334 static char devicename[9] = { 0, };
 335 static struct device dev_ultra = {
 336         devicename, /* device name is inserted by linux/drivers/net/net_init.c */
 337         0, 0, 0, 0,
 338         0, 0,
 339         0, 0, 0, NULL, ultra_probe };
 340 
 341 static int io = 0x200;
 342 static int irq = 0;
 343 
 344 int init_module(void)
     /*  */
 345 {
 346         if (io == 0)
 347                 printk("smc-ultra: You should not use auto-probing with insmod!\n");
 348         dev_ultra.base_addr = io;
 349         dev_ultra.irq       = irq;
 350         if (register_netdev(&dev_ultra) != 0) {
 351                 printk("smc-ultra: register_netdev() returned non-zero.\n");
 352                 return -EIO;
 353         }
 354         return 0;
 355 }
 356 
 357 void
 358 cleanup_module(void)
     /*  */
 359 {
 360         int ioaddr = dev_ultra.base_addr - ULTRA_NIC_OFFSET;
 361 
 362         unregister_netdev(&dev_ultra);
 363 
 364         /* If we don't do this, we can't re-insmod it later. */
 365         release_region(ioaddr, ULTRA_IO_EXTENT);
 366 }
 367 #endif /* MODULE */
 368 
 369 
 370 /*
 371  * Local variables:
 372  *  compile-command: "gcc -D__KERNEL__ -Wall -O6 -I/usr/src/linux/net/inet -c smc-ultra.c"
 373  *  version-control: t
 374  *  kept-new-versions: 5
 375  *  c-indent-level: 4
 376  *  tab-width: 4
 377  * End:
 378  */
/* */
root/drivers/net/smc-ultra.c

DEFINITIONS
