root/drivers/net/tulip.c

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DEFINITIONS

This source file includes following definitions.
  1. dec21040_init
  2. tulip_probe1
  3. tulip_open
  4. tulip_init_ring
  5. tulip_start_xmit
  6. tulip_interrupt
  7. tulip_rx
  8. tulip_close
  9. tulip_get_stats
  10. set_multicast_list
  11. set_mac_address

   1 /* tulip.c: A DEC 21040 ethernet driver for linux. */
   2 /*
   3    NOTICE: this version works with kernels 1.1.82 and later only!
   4         Written 1994,1995 by Donald Becker.
   5 
   6         This software may be used and distributed according to the terms
   7         of the GNU Public License, incorporated herein by reference.
   8 
   9         This driver is for the SMC EtherPower PCI ethernet adapter.
  10         It should work with most other DEC 21*40-based ethercards.
  11 
  12         The author may be reached as becker@CESDIS.gsfc.nasa.gov, or C/O
  13         Center of Excellence in Space Data and Information Sciences
  14            Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771
  15 */
  16 
  17 static char *version = "tulip.c:v0.05 1/20/95 becker@cesdis.gsfc.nasa.gov\n";
  18 
  19 #include <linux/config.h>
  20 #include <linux/kernel.h>
  21 #include <linux/sched.h>
  22 #include <linux/string.h>
  23 #include <linux/ptrace.h>
  24 #include <linux/errno.h>
  25 #include <linux/ioport.h>
  26 #include <linux/malloc.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/pci.h>
  29 #include <linux/bios32.h>
  30 #include <asm/bitops.h>
  31 #include <asm/io.h>
  32 #include <asm/dma.h>
  33 
  34 #include <linux/netdevice.h>
  35 #include <linux/etherdevice.h>
  36 #include <linux/skbuff.h>
  37 
  38 /* This will be in linux/etherdevice.h someday. */
  39 struct device *init_etherdev(struct device *dev, int sizeof_private,
  40                                                          unsigned long *mem_startp);
  41 
  42 /* The total size is unusually large: The 21040 aligns each of its 16
  43    longword-wide registers on a quadword boundary. */
  44 #define TULIP_TOTAL_SIZE 0x80
  45 
  46 #ifdef HAVE_DEVLIST
  47 struct netdev_entry tulip_drv =
  48 {"Tulip", tulip_pci_probe, TULIP_TOTAL_SIZE, NULL};
  49 #endif
  50 
  51 #define TULIP_DEBUG 1
  52 #ifdef TULIP_DEBUG
  53 int tulip_debug = TULIP_DEBUG;
  54 #else
  55 int tulip_debug = 1;
  56 #endif
  57 
  58 /*
  59                                 Theory of Operation
  60 
  61 I. Board Compatibility
  62 
  63 This device driver is designed for the DECchip 21040 "Tulip", Digital's
  64 single-chip ethernet controller for PCI, as used on the SMC EtherPower
  65 ethernet adapter.
  66 
  67 II. Board-specific settings
  68 
  69 PCI bus devices are configured by the system at boot time, so no jumpers
  70 need to be set on the board.  The system BIOS should be set to assign the
  71 PCI INTA signal to an otherwise unused system IRQ line.  While it's
  72 physically possible to shared PCI interrupt lines, the kernel doesn't
  73 support it. 
  74 
  75 III. Driver operation
  76 
  77 IIIa. Ring buffers
  78 The Tulip can use either ring buffers or lists of Tx and Rx descriptors.
  79 The current driver uses a statically allocated Rx ring of descriptors and
  80 buffers, and a list of the Tx buffers.
  81 
  82 IIIC. Synchronization
  83 The driver runs as two independent, single-threaded flows of control.  One
  84 is the send-packet routine, which enforces single-threaded use by the
  85 dev->tbusy flag.  The other thread is the interrupt handler, which is single
  86 threaded by the hardware and other software.
  87 
  88 The send packet thread has partial control over the Tx ring and 'dev->tbusy'
  89 flag.  It sets the tbusy flag whenever it's queuing a Tx packet. If the next
  90 queue slot is empty, it clears the tbusy flag when finished otherwise it sets
  91 the 'tp->tx_full' flag.
  92 
  93 The interrupt handler has exclusive control over the Rx ring and records stats
  94 from the Tx ring.  (The Tx-done interrupt can't be selectively turned off, so
  95 we can't avoid the interrupt overhead by having the Tx routine reap the Tx
  96 stats.)  After reaping the stats, it marks the queue entry as empty by setting
  97 the 'base' to zero.      Iff the 'tp->tx_full' flag is set, it clears both the
  98 tx_full and tbusy flags.
  99 
 100 IV. Notes
 101 
 102 Thanks to Duke Kamstra of SMC for providing an EtherPower board.
 103 
 104 The DEC databook doesn't document which Rx filter settings accept broadcast
 105 packets.  Nor does it document how to configure the part to configure the
 106 serial subsystem for normal (vs. loopback) operation or how to have it
 107 autoswitch between internal 10baseT, SIA and AUI transceivers.
 108 
 109 The databook claims that CSR13, CSR14, and CSR15 should each be the last
 110 register of the set CSR12-15 written.   Hmmm, now how is that possible?
 111 */
 112 
 113 #define DEC_VENDOR_ID   0x1011          /* Hex 'D' :-> */
 114 #define DEC_21040_ID    0x0002          /* Change for 21140. */
 115 
 116 /* Keep the ring sizes a power of two for efficiency. */
 117 #define TX_RING_SIZE    4
 118 #define RX_RING_SIZE    4
 119 #define PKT_BUF_SZ              1536                    /* Size of each temporary Rx buffer.*/
 120 
 121 /* Offsets to the Command and Status Registers, "CSRs".  All accesses
 122    must be longword instructions and quadword aligned. */
 123 enum tulip_offsets {
 124         CSR0=0,    CSR1=0x08, CSR2=0x10, CSR3=0x18, CSR4=0x20, CSR5=0x28,
 125         CSR6=0x30, CSR7=0x38, CSR8=0x40, CSR9=0x48, CSR10=0x50, CSR11=0x58,
 126         CSR12=0x60, CSR13=0x68, CSR14=0x70, CSR15=0x78 };
 127 
 128 /* The Tulip Rx and Tx buffer descriptors. */
 129 struct tulip_rx_desc {
 130         int status;
 131         int length;
 132         char *buffer1, *buffer2;                        /* We use only buffer 1.  */
 133 };
 134 
 135 struct tulip_tx_desc {
 136         int status;
 137         int length;
 138         char *buffer1, *buffer2;                        /* We use only buffer 1.  */
 139 };
 140 
 141 struct tulip_private {
 142         char devname[8];                        /* Used only for kernel debugging. */
 143         struct tulip_rx_desc rx_ring[RX_RING_SIZE];
 144         struct tulip_tx_desc tx_ring[TX_RING_SIZE];
 145         /* The saved address of a sent-in-place packet/buffer, for skfree(). */
 146         struct sk_buff* tx_skbuff[TX_RING_SIZE];
 147         long rx_buffs;                          /* Address of temporary Rx buffers. */
 148         struct enet_statistics stats;
 149         int setup_frame[48];            /* Pseudo-Tx frame to init address table. */
 150         unsigned int cur_rx, cur_tx;            /* The next free ring entry */
 151         unsigned int dirty_rx, dirty_tx;        /* The ring entries to be free()ed. */
 152         unsigned int tx_full:1;
 153         int pad0, pad1;                                         /* Used for 8-byte alignment */
 154 };
 155 
 156 static unsigned long tulip_probe1(unsigned long mem_start, int ioaddr,
 157                                                                   int irq);
 158 static int tulip_open(struct device *dev);
 159 static void tulip_init_ring(struct device *dev);
 160 static int tulip_start_xmit(struct sk_buff *skb, struct device *dev);
 161 static int tulip_rx(struct device *dev);
 162 static void tulip_interrupt(int irq, struct pt_regs *regs);
 163 static int tulip_close(struct device *dev);
 164 static struct enet_statistics *tulip_get_stats(struct device *dev);
 165 static void set_multicast_list(struct device *dev, int num_addrs, void *addrs);
 166 static int set_mac_address(struct device *dev, void *addr);
 167 
 168 
 169 
 170 /* This 21040 probe is unlike most other board probes.  We can use memory
 171    efficiently by allocating a large contiguous region and dividing it
 172    ourselves.  This is done by having the initialization occur before
 173    the 'kmalloc()' memory management system is started. */
 174 
 175 unsigned long dec21040_init(unsigned long mem_start, unsigned long mem_end)
     /* [previous][next][first][last][top][bottom][index][help] */
 176 {
 177 
 178     if (pcibios_present()) {
 179             int pci_index;
 180                 for (pci_index = 0; pci_index < 8; pci_index++) {
 181                         unsigned char pci_bus, pci_device_fn, pci_irq_line;
 182                         unsigned long pci_ioaddr;
 183                 
 184                         if (pcibios_find_device (DEC_VENDOR_ID, DEC_21040_ID, pci_index,
 185                                                                          &pci_bus, &pci_device_fn) != 0)
 186                                 break;
 187                         pcibios_read_config_byte(pci_bus, pci_device_fn,
 188                                                                          PCI_INTERRUPT_LINE, &pci_irq_line);
 189                         pcibios_read_config_dword(pci_bus, pci_device_fn,
 190                                                                           PCI_BASE_ADDRESS_0, &pci_ioaddr);
 191                         /* Remove I/O space marker in bit 0. */
 192                         pci_ioaddr &= ~3;
 193                         if (tulip_debug > 2)
 194                                 printk("Found DEC PCI Tulip at I/O %#lx, IRQ %d.\n",
 195                                            pci_ioaddr, pci_irq_line);
 196                         mem_start = tulip_probe1(mem_start, pci_ioaddr, pci_irq_line);
 197                 }
 198         }
 199 
 200         return mem_start;
 201 }
 202 
 203 unsigned long tulip_probe1(unsigned long mem_start, int ioaddr, int irq)
     /* [previous][next][first][last][top][bottom][index][help] */
 204 {
 205         static int did_version = 0;                     /* Already printed version info. */
 206         struct device *dev;
 207         struct tulip_private *tp;
 208         int i;
 209 
 210         if (tulip_debug > 0  &&  did_version++ == 0)
 211                 printk(version);
 212 
 213         dev = init_etherdev(0, sizeof(struct tulip_private)
 214                                                 + PKT_BUF_SZ*RX_RING_SIZE,
 215                                                 &mem_start);
 216 
 217         printk("%s: DEC 21040 Tulip at %#3x,", dev->name, ioaddr);
 218 
 219         /* Stop the chip's Tx and Rx processes. */
 220         outl(inl(ioaddr + CSR6) & ~0x2002, ioaddr + CSR6);
 221         /* Clear the missed-packet counter. */
 222         inl(ioaddr + CSR8) & 0xffff;
 223 
 224         /* The station address ROM is read byte serially.  The register must
 225            be polled, waiting for the value to be read bit serially from the
 226            EEPROM.
 227            */
 228         outl(0, ioaddr + CSR9);         /* Reset the pointer with a dummy write. */
 229         for (i = 0; i < 6; i++) {
 230                 int value, boguscnt = 100000;
 231                 do
 232                         value = inl(ioaddr + CSR9);
 233                 while (value < 0  && --boguscnt > 0);
 234                 printk(" %2.2x", dev->dev_addr[i] = value);
 235         }
 236         printk(", IRQ %d\n", irq);
 237 
 238         /* We do a request_region() only to register /proc/ioports info. */
 239         request_region(ioaddr, TULIP_TOTAL_SIZE, "DEC Tulip Ethernet");
 240 
 241         dev->base_addr = ioaddr;
 242         dev->irq = irq;
 243 
 244         /* Make certain the data structures are quadword aligned. */
 245         dev->priv = (void *)(((int)dev->priv + 7) & ~7);
 246         tp = (struct tulip_private *)dev->priv;
 247         tp->rx_buffs = (long)dev->priv + sizeof(struct tulip_private);
 248 
 249         /* The Tulip-specific entries in the device structure. */
 250         dev->open = &tulip_open;
 251         dev->hard_start_xmit = &tulip_start_xmit;
 252         dev->stop = &tulip_close;
 253         dev->get_stats = &tulip_get_stats;
 254 #ifdef HAVE_MULTICAST
 255         dev->set_multicast_list = &set_multicast_list;
 256 #endif
 257 #ifdef HAVE_SET_MAC_ADDR
 258         dev->set_mac_address = &set_mac_address;
 259 #endif
 260 
 261         return mem_start;
 262 }
 263 
 264 
 265 static int
 266 tulip_open(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 267 {
 268         struct tulip_private *tp = (struct tulip_private *)dev->priv;
 269         int ioaddr = dev->base_addr;
 270 
 271         /* Reset the chip, holding bit 0 set at least 10 PCI cycles. */
 272         outl(0xfff80001, ioaddr + CSR0);
 273         SLOW_DOWN_IO;
 274         /* Deassert reset.  Set 8 longword cache alignment, 8 longword burst.
 275            Cache alignment bits 15:14        Burst length 13:8
 276         0000    No alignment  0x00000000 unlimited              0800 8 longwords
 277                 4000    8  longwords            0100 1 longword         1000 16 longwords
 278                 8000    16 longwords            0200 2 longwords        2000 32 longwords
 279                 C000    32  longwords           0400 4 longwords
 280            Wait the specified 50 PCI cycles after a reset by initializing
 281            Tx and Rx queues and the address filter list. */
 282         outl(0xfff84800, ioaddr + CSR0);
 283 
 284         if (irq2dev_map[dev->irq] != NULL
 285                 || (irq2dev_map[dev->irq] = dev) == NULL
 286                 || dev->irq == 0
 287                 || request_irq(dev->irq, &tulip_interrupt, 0, "DEC 21040 Tulip")) {
 288                 return -EAGAIN;
 289         }
 290 
 291         if (tulip_debug > 1)
 292                 printk("%s: tulip_open() irq %d.\n", dev->name, dev->irq);
 293 
 294         tulip_init_ring(dev);
 295 
 296         /* Fill the whole address filter table with our physical address. */
 297         { 
 298                 unsigned short *eaddrs = (unsigned short *)dev->dev_addr;
 299                 int *setup_frm = tp->setup_frame, i;
 300 
 301                 /* You must add the broadcast address when doing perfect filtering! */
 302                 *setup_frm++ = 0xffff;
 303                 *setup_frm++ = 0xffff;
 304                 *setup_frm++ = 0xffff;
 305                 /* Fill the rest of the accept table with our physical address. */
 306                 for (i = 1; i < 16; i++) {
 307                         *setup_frm++ = eaddrs[0];
 308                         *setup_frm++ = eaddrs[1];
 309                         *setup_frm++ = eaddrs[2];
 310                 }
 311                 /* Put the setup frame on the Tx list. */
 312                 tp->tx_ring[0].length = 0x08000000 | 192;
 313                 tp->tx_ring[0].buffer1 = (char *)tp->setup_frame;
 314                 tp->tx_ring[0].buffer2 = 0;
 315                 tp->tx_ring[0].status = 0x80000000;
 316 
 317                 tp->cur_tx++, tp->dirty_tx++;
 318         }
 319 
 320         outl((int)tp->rx_ring, ioaddr + CSR3);
 321         outl((int)tp->tx_ring, ioaddr + CSR4);
 322 
 323         /* Turn on the xcvr interface. */
 324         outl(0x00000000, ioaddr + CSR13);
 325         outl(0x00000004, ioaddr + CSR13);
 326 
 327         /* Start the chip's Tx and Rx processes. */
 328         outl(0xfffe2002, ioaddr + CSR6);
 329 
 330         /* Trigger an immediate transmit demand to process the setup frame. */
 331         outl(0, ioaddr + CSR1);
 332 
 333         dev->tbusy = 0;
 334         dev->interrupt = 0;
 335         dev->start = 1;
 336 
 337         /* Enable interrupts by setting the interrupt mask. */
 338         outl(0xFFFFFFFF, ioaddr + CSR7);
 339 
 340         if (tulip_debug > 2) {
 341                 printk("%s: Done tulip_open(), CSR0 %8.8x, CSR13 %8.8x.\n",
 342                            dev->name, inl(ioaddr + CSR0), inl(ioaddr + CSR13));
 343         }
 344         return 0;
 345 }
 346 
 347 /* Initialize the Rx and Tx rings, along with various 'dev' bits. */
 348 static void
 349 tulip_init_ring(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 350 {
 351         struct tulip_private *tp = (struct tulip_private *)dev->priv;
 352         int i;
 353 
 354         tp->tx_full = 0;
 355         tp->cur_rx = tp->cur_tx = 0;
 356         tp->dirty_rx = tp->dirty_tx = 0;
 357 
 358         for (i = 0; i < RX_RING_SIZE; i++) {
 359                 tp->rx_ring[i].status = 0x80000000;     /* Owned by Tulip chip */
 360                 tp->rx_ring[i].length = PKT_BUF_SZ;
 361                 tp->rx_ring[i].buffer1 = (char *)(tp->rx_buffs + i*PKT_BUF_SZ);
 362                 tp->rx_ring[i].buffer2 = (char *)&tp->rx_ring[i+1];
 363         }
 364         /* Mark the last entry as wrapping the ring. */ 
 365         tp->rx_ring[i-1].length = PKT_BUF_SZ | 0x02000000;
 366         tp->rx_ring[i-1].buffer2 = (char *)&tp->rx_ring[0];
 367 
 368         /* The Tx buffer descriptor is filled in as needed, but we
 369            do need to clear the ownership bit. */
 370         for (i = 0; i < TX_RING_SIZE; i++) {
 371                 tp->tx_ring[i].status = 0x00000000;
 372         }
 373 }
 374 
 375 static int
 376 tulip_start_xmit(struct sk_buff *skb, struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 377 {
 378         struct tulip_private *tp = (struct tulip_private *)dev->priv;
 379         int ioaddr = dev->base_addr;
 380         int entry;
 381 
 382         /* Transmitter timeout, serious problems. */
 383         if (dev->tbusy) {
 384                 int tickssofar = jiffies - dev->trans_start;
 385                 int i;
 386                 if (tickssofar < 20)
 387                         return 1;
 388                 printk("%s: transmit timed out, status %8.8x, SIA %8.8x %8.8x %8.8x %8.8x, resetting...\n",
 389                            dev->name, inl(ioaddr + CSR5), inl(ioaddr + CSR12),
 390                            inl(ioaddr + CSR13), inl(ioaddr + CSR14), inl(ioaddr + CSR15));
 391                 printk("  Rx ring %8.8x: ", (int)tp->rx_ring);
 392                 for (i = 0; i < RX_RING_SIZE; i++)
 393                         printk(" %8.8x", (unsigned int)tp->rx_ring[i].status);
 394                 printk("\n  Tx ring %8.8x: ", (int)tp->tx_ring);
 395                 for (i = 0; i < TX_RING_SIZE; i++)
 396                         printk(" %8.8x", (unsigned int)tp->tx_ring[i].status);
 397                 printk("\n");
 398 
 399                 tp->stats.tx_errors++;
 400                 /* We should reinitialize the hardware here. */
 401                 dev->tbusy=0;
 402                 dev->trans_start = jiffies;
 403                 return 0;
 404         }
 405 
 406         if (skb == NULL || skb->len <= 0) {
 407                 printk("%s: Obsolete driver layer request made: skbuff==NULL.\n",
 408                            dev->name);
 409                 dev_tint(dev);
 410                 return 0;
 411         }
 412 
 413         /* Block a timer-based transmit from overlapping.  This could better be
 414            done with atomic_swap(1, dev->tbusy), but set_bit() works as well.
 415            If this ever occurs the queue layer is doing something evil! */
 416         if (set_bit(0, (void*)&dev->tbusy) != 0) {
 417                 printk("%s: Transmitter access conflict.\n", dev->name);
 418                 return 1;
 419         }
 420 
 421         /* Caution: the write order is important here, set the base address
 422            with the "ownership" bits last. */
 423 
 424         /* Calculate the next Tx descriptor entry. */
 425         entry = tp->cur_tx % TX_RING_SIZE;
 426 
 427         tp->tx_full = 1;
 428         tp->tx_skbuff[entry] = skb;
 429         tp->tx_ring[entry].length = skb->len |
 430                 (entry == TX_RING_SIZE-1 ? 0xe2000000 : 0xe0000000);
 431         tp->tx_ring[entry].buffer1 = skb->data;
 432         tp->tx_ring[entry].buffer2 = 0;
 433         tp->tx_ring[entry].status = 0x80000000; /* Pass ownership to the chip. */
 434 
 435         tp->cur_tx++;
 436 
 437         /* Trigger an immediate transmit demand. */
 438         outl(0, ioaddr + CSR1);
 439 
 440         dev->trans_start = jiffies;
 441 
 442         return 0;
 443 }
 444 
 445 /* The interrupt handler does all of the Rx thread work and cleans up
 446    after the Tx thread. */
 447 static void tulip_interrupt(int irq, struct pt_regs *regs)
     /* [previous][next][first][last][top][bottom][index][help] */
 448 {
 449         struct device *dev = (struct device *)(irq2dev_map[irq]);
 450         struct tulip_private *lp;
 451         int csr5, ioaddr, boguscnt=10;
 452 
 453         if (dev == NULL) {
 454                 printk ("tulip_interrupt(): irq %d for unknown device.\n", irq);
 455                 return;
 456         }
 457 
 458         ioaddr = dev->base_addr;
 459         lp = (struct tulip_private *)dev->priv;
 460         if (dev->interrupt)
 461                 printk("%s: Re-entering the interrupt handler.\n", dev->name);
 462 
 463         dev->interrupt = 1;
 464 
 465         do {
 466                 csr5 = inl(ioaddr + CSR5);
 467                 /* Acknowledge all of the current interrupt sources ASAP. */
 468                 outl(csr5 & 0x0001ffff, ioaddr + CSR5);
 469 
 470                 if (tulip_debug > 4)
 471                         printk("%s: interrupt  csr5=%#8.8x new csr5=%#8.8x.\n",
 472                                    dev->name, csr5, inl(dev->base_addr + CSR5));
 473 
 474                 if ((csr5 & 0x00018000) == 0)
 475                         break;
 476 
 477                 if (csr5 & 0x0040)                      /* Rx interrupt */
 478                         tulip_rx(dev);
 479 
 480                 if (csr5 & 0x0001) {            /* Tx-done interrupt */
 481                         int dirty_tx = lp->dirty_tx;
 482 
 483                         while (dirty_tx < lp->cur_tx) {
 484                                 int entry = dirty_tx % TX_RING_SIZE;
 485                                 int status = lp->tx_ring[entry].status;
 486 
 487                                 if (status < 0)
 488                                         break;                  /* It still hasn't been Txed */
 489 
 490                                 if (status & 0x8000) {
 491                                         /* There was an major error, log it. */
 492                                         lp->stats.tx_errors++;
 493                                         if (status & 0x4104) lp->stats.tx_aborted_errors++;
 494                                         if (status & 0x0C00) lp->stats.tx_carrier_errors++;
 495                                         if (status & 0x0200) lp->stats.tx_window_errors++;
 496                                         if (status & 0x0002) lp->stats.tx_fifo_errors++;
 497                                         if (status & 0x0080) lp->stats.tx_heartbeat_errors++;
 498 #ifdef ETHER_STATS
 499                                         if (status & 0x0100) lp->stats.collisions16++;
 500 #endif
 501                                 } else {
 502 #ifdef ETHER_STATS
 503                                         if (status & 0x0001) lp->stats.tx_deferred++;
 504 #endif
 505                                         lp->stats.collisions += (status >> 3) & 15;
 506                                         lp->stats.tx_packets++;
 507                                 }
 508 
 509                                 /* Free the original skb. */
 510                                 dev_kfree_skb(lp->tx_skbuff[entry], FREE_WRITE);
 511                                 dirty_tx++;
 512                         }
 513 
 514 #ifndef final_version
 515                         if (lp->cur_tx - dirty_tx >= TX_RING_SIZE) {
 516                                 printk("out-of-sync dirty pointer, %d vs. %d, full=%d.\n",
 517                                            dirty_tx, lp->cur_tx, lp->tx_full);
 518                                 dirty_tx += TX_RING_SIZE;
 519                         }
 520 #endif
 521 
 522                         if (lp->tx_full && dev->tbusy
 523                                 && dirty_tx > lp->cur_tx - TX_RING_SIZE + 2) {
 524                                 /* The ring is no longer full, clear tbusy. */
 525                                 lp->tx_full = 0;
 526                                 dev->tbusy = 0;
 527                                 mark_bh(NET_BH);
 528                         }
 529 
 530                         lp->dirty_tx = dirty_tx;
 531                 }
 532 
 533                 /* Log errors. */
 534                 if (csr5 & 0x8000) {    /* Abnormal error summary bit. */
 535                         if (csr5 & 0x0008) lp->stats.tx_errors++; /* Tx babble. */
 536                         if (csr5 & 0x0100) {            /* Missed a Rx frame. */
 537                                 lp->stats.rx_errors++;
 538                                 lp->stats.rx_missed_errors += inl(ioaddr + CSR8) & 0xffff;
 539                         }
 540                         if (csr5 & 0x0800) {
 541                                 printk("%s: Something Wicked happened! %8.8x.\n",
 542                                            dev->name, csr5);
 543                                 /* Hmmmmm, it's not clear what to do here. */
 544                         }
 545                 }
 546                 if (--boguscnt < 0) {
 547                         printk("%s: Too much work at interrupt, csr5=0x%8.8x.\n",
 548                                    dev->name, csr5);
 549                         /* Clear all interrupt sources. */
 550                         outl(0x0001ffff, ioaddr + CSR5);
 551                         break;
 552                 }
 553         } while (1);
 554 
 555         if (tulip_debug > 3)
 556                 printk("%s: exiting interrupt, csr5=%#4.4x.\n",
 557                            dev->name, inl(ioaddr + CSR5));
 558 
 559         /* Special code for testing *only*. */
 560         {
 561                 static int stopit = 10;
 562                 if (dev->start == 0  &&  --stopit < 0) {
 563                         printk("%s: Emergency stop, looping startup interrupt.\n",
 564                                    dev->name);
 565                         free_irq(irq);
 566                 }
 567         }
 568 
 569         dev->interrupt = 0;
 570         return;
 571 }
 572 
 573 static int
 574 tulip_rx(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 575 {
 576         struct tulip_private *lp = (struct tulip_private *)dev->priv;
 577         int entry = lp->cur_rx % RX_RING_SIZE;
 578         int i;
 579                 
 580         if (tulip_debug > 4)
 581                 printk(" In tulip_rx().\n");
 582         /* If we own the next entry, it's a new packet. Send it up. */
 583         while (lp->rx_ring[entry].status >= 0) {
 584                 int status = lp->rx_ring[entry].status;
 585 
 586                 if (tulip_debug > 4)
 587                         printk("  tulip_rx() status was %8.8x.\n", status);
 588                 if ((status & 0x0300) != 0x0300) {
 589                         printk("%s: Ethernet frame spanned multiple buffers, status %8.8x!\n",
 590                                    dev->name, status);
 591                 } else if (status & 0x8000) {
 592                         /* There was a fatal error. */
 593                         lp->stats.rx_errors++; /* end of a packet.*/
 594                         if (status & 0x0890) lp->stats.rx_length_errors++;
 595                         if (status & 0x0004) lp->stats.rx_frame_errors++;
 596                         if (status & 0x0002) lp->stats.rx_crc_errors++;
 597                         if (status & 0x0001) lp->stats.rx_fifo_errors++;
 598                 } else {
 599                         /* Malloc up new buffer, compatible with net-2e. */
 600                         short pkt_len = lp->rx_ring[entry].status >> 16;
 601                         struct sk_buff *skb;
 602 
 603                         skb = alloc_skb(pkt_len, GFP_ATOMIC);
 604                         if (skb == NULL) {
 605                                 printk("%s: Memory squeeze, deferring packet.\n", dev->name);
 606                                 /* Check that at least two ring entries are free.
 607                                    If not, free one and mark stats->rx_dropped++. */
 608                                 for (i=0; i < RX_RING_SIZE; i++)
 609                                         if (lp->rx_ring[(entry+i) % RX_RING_SIZE].status < 0)
 610                                                 break;
 611 
 612                                 if (i > RX_RING_SIZE -2) {
 613                                         lp->stats.rx_dropped++;
 614                                         lp->rx_ring[entry].status = 0x80000000;
 615                                         lp->cur_rx++;
 616                                 }
 617                                 break;
 618                         }
 619                         skb->len = pkt_len;
 620                         skb->dev = dev;
 621                         memcpy(skb->data, lp->rx_ring[entry].buffer1, pkt_len);
 622                         netif_rx(skb);
 623                         lp->stats.rx_packets++;
 624                 }
 625 
 626                 lp->rx_ring[entry].status = 0x80000000;
 627                 entry = (++lp->cur_rx) % RX_RING_SIZE;
 628         }
 629 
 630         return 0;
 631 }
 632 
 633 static int
 634 tulip_close(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 635 {
 636         int ioaddr = dev->base_addr;
 637         struct tulip_private *tp = (struct tulip_private *)dev->priv;
 638 
 639         dev->start = 0;
 640         dev->tbusy = 1;
 641 
 642         if (tulip_debug > 1)
 643                 printk("%s: Shutting down ethercard, status was %2.2x.\n",
 644                            dev->name, inl(ioaddr + CSR5));
 645 
 646         /* Disable interrupts by clearing the interrupt mask. */
 647         outl(0x00000000, ioaddr + CSR7);
 648         /* Stop the chip's Tx and Rx processes. */
 649         outl(inl(ioaddr + CSR6) & ~0x2002, ioaddr + CSR6);
 650 
 651         tp->stats.rx_missed_errors += inl(ioaddr + CSR8) & 0xffff;
 652 
 653         free_irq(dev->irq);
 654         irq2dev_map[dev->irq] = 0;
 655 
 656         return 0;
 657 }
 658 
 659 static struct enet_statistics *
 660 tulip_get_stats(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 661 {
 662         struct tulip_private *tp = (struct tulip_private *)dev->priv;
 663         short ioaddr = dev->base_addr;
 664 
 665         tp->stats.rx_missed_errors += inl(ioaddr + CSR8) & 0xffff;
 666 
 667         return &tp->stats;
 668 }
 669 
 670 /* Set or clear the multicast filter for this adaptor.
 671    num_addrs == -1              Promiscuous mode, receive all packets
 672    num_addrs == 0               Normal mode, clear multicast list
 673    num_addrs > 0                Multicast mode, receive normal and MC packets, and do
 674                                                 best-effort filtering.
 675  */
 676 static void
 677 set_multicast_list(struct device *dev, int num_addrs, void *addrs)
     /* [previous][next][first][last][top][bottom][index][help] */
 678 {
 679         short ioaddr = dev->base_addr;
 680         int csr6 = inl(ioaddr + CSR6) & ~0x00D5;
 681 
 682         if (num_addrs > 15) {
 683                 /* Too many to filter perfectly -- accept all multicasts. */
 684                 outl(csr6 | 0x0080, ioaddr + CSR6);
 685         } else if (num_addrs < 0) {                     /* Set promiscuous. */
 686                 outl(csr6 | 0x00C0, ioaddr + CSR6);
 687                 /* Log any net taps. */
 688                 printk("%s: Promiscuous mode enabled.\n", dev->name);
 689         } else {
 690                 struct tulip_private *tp = (struct tulip_private *)dev->priv;
 691                 int *setup_frm = tp->setup_frame;
 692                 unsigned short *eaddrs = addrs;
 693                 int i;
 694 
 695                 /* We have <= 15 addresses that we can use the wonderful
 696                    16 address perfect filtering of the Tulip.  Note that only
 697                    the low shortword of setup_frame[] is valid. */
 698                 outl(csr6 | 0x0000, ioaddr + CSR6);
 699                 for(i = 0; i < num_addrs; i++) {
 700                         *setup_frm++ = *eaddrs++;
 701                         *setup_frm++ = *eaddrs++;
 702                         *setup_frm++ = *eaddrs++;
 703                 }
 704                 /* Fill the rest of the table with our physical address. */
 705                 eaddrs = (unsigned short *)dev->dev_addr;
 706                 do {
 707                         *setup_frm++ = eaddrs[0];
 708                         *setup_frm++ = eaddrs[1];
 709                         *setup_frm++ = eaddrs[2];
 710                 } while (++i < 16);
 711 
 712                 /* Now add this frame to the Tx list. */
 713         }
 714 }
 715 
 716 static int
 717 set_mac_address(struct device *dev, void *addr)
     /* [previous][next][first][last][top][bottom][index][help] */
 718 {
 719         int i;
 720         if (dev->start)
 721                 return -EBUSY;
 722         printk("%s: Setting MAC address to ", dev->name);
 723         for (i = 0; i < 6; i++)
 724                 printk(" %2.2x", dev->dev_addr[i] = ((unsigned char *)addr)[i]);
 725         printk(".\n");
 726         return 0;
 727 }
 728 
 729 
 730 /*
 731  * Local variables:
 732  *  compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -m486 -c tulip.c"
 733  *  c-indent-level: 4
 734  *  tab-width: 4
 735  * End:
 736  */

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