root/drivers/net/lance.c

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DEFINITIONS

This source file includes following definitions.
  1. lance_init
  2. lance_probe1
  3. lance_open
  4. lance_purge_tx_ring
  5. lance_init_ring
  6. lance_restart
  7. lance_start_xmit
  8. lance_interrupt
  9. lance_rx
  10. lance_close
  11. lance_get_stats
  12. set_multicast_list

   1 /* lance.c: An AMD LANCE 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         This software may be used and distributed according to the terms
   8         of the GNU Public License, incorporated herein by reference.
   9 
  10         This driver is for the Allied Telesis AT1500 and HP J2405A, and should work
  11         with most other LANCE-based bus-master (NE2100 clone) ethercards.
  12 
  13         The author may be reached as becker@CESDIS.gsfc.nasa.gov, or C/O
  14         Center of Excellence in Space Data and Information Sciences
  15            Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771
  16 */
  17 
  18 static const char *version = "lance.c:v1.08 4/10/95 dplatt@3do.com\n";
  19 
  20 #include <linux/config.h>
  21 #include <linux/kernel.h>
  22 #include <linux/sched.h>
  23 #include <linux/string.h>
  24 #include <linux/ptrace.h>
  25 #include <linux/errno.h>
  26 #include <linux/ioport.h>
  27 #include <linux/malloc.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/pci.h>
  30 #include <linux/bios32.h>
  31 #include <asm/bitops.h>
  32 #include <asm/io.h>
  33 #include <asm/dma.h>
  34 
  35 #include <linux/netdevice.h>
  36 #include <linux/etherdevice.h>
  37 #include <linux/skbuff.h>
  38 
  39 static unsigned int lance_portlist[] = {0x300, 0x320, 0x340, 0x360, 0};
  40 void lance_probe1(int ioaddr);
  41 
  42 #ifdef HAVE_DEVLIST
  43 struct netdev_entry lance_drv =
  44 {"lance", lance_probe1, LANCE_TOTAL_SIZE, lance_portlist};
  45 #endif
  46 
  47 #ifdef LANCE_DEBUG
  48 int lance_debug = LANCE_DEBUG;
  49 #else
  50 int lance_debug = 1;
  51 #endif
  52 
  53 /*
  54                                 Theory of Operation
  55 
  56 I. Board Compatibility
  57 
  58 This device driver is designed for the AMD 79C960, the "PCnet-ISA
  59 single-chip ethernet controller for ISA".  This chip is used in a wide
  60 variety of boards from vendors such as Allied Telesis, HP, Kingston,
  61 and Boca.  This driver is also intended to work with older AMD 7990
  62 designs, such as the NE1500 and NE2100, and newer 79C961.  For convenience,
  63 I use the name LANCE to refer to all of the AMD chips, even though it properly
  64 refers only to the original 7990.
  65 
  66 II. Board-specific settings
  67 
  68 The driver is designed to work the boards that use the faster
  69 bus-master mode, rather than in shared memory mode.      (Only older designs
  70 have on-board buffer memory needed to support the slower shared memory mode.)
  71 
  72 Most ISA boards have jumpered settings for the I/O base, IRQ line, and DMA
  73 channel.  This driver probes the likely base addresses:
  74 {0x300, 0x320, 0x340, 0x360}.
  75 After the board is found it generates a DMA-timeout interrupt and uses
  76 autoIRQ to find the IRQ line.  The DMA channel can be set with the low bits
  77 of the otherwise-unused dev->mem_start value (aka PARAM1).  If unset it is
  78 probed for by enabling each free DMA channel in turn and checking if
  79 initialization succeeds.
  80 
  81 The HP-J2405A board is an exception: with this board it's easy to read the
  82 EEPROM-set values for the base, IRQ, and DMA.  (Of course you must already
  83 _know_ the base address -- that field is for writing the EEPROM.)
  84 
  85 III. Driver operation
  86 
  87 IIIa. Ring buffers
  88 The LANCE uses ring buffers of Tx and Rx descriptors.  Each entry describes
  89 the base and length of the data buffer, along with status bits.  The length
  90 of these buffers is set by LANCE_LOG_{RX,TX}_BUFFERS, which is log_2() of
  91 the buffer length (rather than being directly the buffer length) for
  92 implementation ease.  The current values are 2 (Tx) and 4 (Rx), which leads to
  93 ring sizes of 4 (Tx) and 16 (Rx).  Increasing the number of ring entries
  94 needlessly uses extra space and reduces the chance that an upper layer will
  95 be able to reorder queued Tx packets based on priority.  Decreasing the number
  96 of entries makes it more difficult to achieve back-to-back packet transmission
  97 and increases the chance that Rx ring will overflow.  (Consider the worst case
  98 of receiving back-to-back minimum-sized packets.)
  99 
 100 The LANCE has the capability to "chain" both Rx and Tx buffers, but this driver
 101 statically allocates full-sized (slightly oversized -- PKT_BUF_SZ) buffers to
 102 avoid the administrative overhead. For the Rx side this avoids dynamically
 103 allocating full-sized buffers "just in case", at the expense of a
 104 memory-to-memory data copy for each packet received.  For most systems this
 105 is a good tradeoff: the Rx buffer will always be in low memory, the copy
 106 is inexpensive, and it primes the cache for later packet processing.  For Tx
 107 the buffers are only used when needed as low-memory bounce buffers.
 108 
 109 IIIB. 16M memory limitations.
 110 For the ISA bus master mode all structures used directly by the LANCE,
 111 the initialization block, Rx and Tx rings, and data buffers, must be
 112 accessible from the ISA bus, i.e. in the lower 16M of real memory.
 113 This is a problem for current Linux kernels on >16M machines. The network
 114 devices are initialized after memory initialization, and the kernel doles out
 115 memory from the top of memory downward.  The current solution is to have a
 116 special network initialization routine that's called before memory
 117 initialization; this will eventually be generalized for all network devices.
 118 As mentioned before, low-memory "bounce-buffers" are used when needed.
 119 
 120 IIIC. Synchronization
 121 The driver runs as two independent, single-threaded flows of control.  One
 122 is the send-packet routine, which enforces single-threaded use by the
 123 dev->tbusy flag.  The other thread is the interrupt handler, which is single
 124 threaded by the hardware and other software.
 125 
 126 The send packet thread has partial control over the Tx ring and 'dev->tbusy'
 127 flag.  It sets the tbusy flag whenever it's queuing a Tx packet. If the next
 128 queue slot is empty, it clears the tbusy flag when finished otherwise it sets
 129 the 'lp->tx_full' flag.
 130 
 131 The interrupt handler has exclusive control over the Rx ring and records stats
 132 from the Tx ring.  (The Tx-done interrupt can't be selectively turned off, so
 133 we can't avoid the interrupt overhead by having the Tx routine reap the Tx
 134 stats.)  After reaping the stats, it marks the queue entry as empty by setting
 135 the 'base' to zero.      Iff the 'lp->tx_full' flag is set, it clears both the
 136 tx_full and tbusy flags.
 137 
 138 */
 139 
 140 /* Set the number of Tx and Rx buffers, using Log_2(# buffers).
 141    Reasonable default values are 4 Tx buffers, and 16 Rx buffers.
 142    That translates to 2 (4 == 2^^2) and 4 (16 == 2^^4). */
 143 #ifndef LANCE_LOG_TX_BUFFERS
 144 #define LANCE_LOG_TX_BUFFERS 4
 145 #define LANCE_LOG_RX_BUFFERS 4
 146 #endif
 147 
 148 #define TX_RING_SIZE                    (1 << (LANCE_LOG_TX_BUFFERS))
 149 #define TX_RING_MOD_MASK                (TX_RING_SIZE - 1)
 150 #define TX_RING_LEN_BITS                ((LANCE_LOG_TX_BUFFERS) << 29)
 151 
 152 #define RX_RING_SIZE                    (1 << (LANCE_LOG_RX_BUFFERS))
 153 #define RX_RING_MOD_MASK                (RX_RING_SIZE - 1)
 154 #define RX_RING_LEN_BITS                ((LANCE_LOG_RX_BUFFERS) << 29)
 155 
 156 #define PKT_BUF_SZ              1544
 157 
 158 /* Offsets from base I/O address. */
 159 #define LANCE_DATA 0x10
 160 #define LANCE_ADDR 0x12
 161 #define LANCE_RESET 0x14
 162 #define LANCE_BUS_IF 0x16
 163 #define LANCE_TOTAL_SIZE 0x18
 164 
 165 /* The LANCE Rx and Tx ring descriptors. */
 166 struct lance_rx_head {
 167         int base;
 168         short buf_length;                       /* This length is 2s complement (negative)! */
 169         short msg_length;                       /* This length is "normal". */
 170 };
 171 
 172 struct lance_tx_head {
 173         int       base;
 174         short length;                           /* Length is 2s complement (negative)! */
 175         short misc;
 176 };
 177 
 178 /* The LANCE initialization block, described in databook. */
 179 struct lance_init_block {
 180         unsigned short mode;            /* Pre-set mode (reg. 15) */
 181         unsigned char phys_addr[6]; /* Physical ethernet address */
 182         unsigned filter[2];                     /* Multicast filter (unused). */
 183         /* Receive and transmit ring base, along with extra bits. */
 184         unsigned rx_ring;                       /* Tx and Rx ring base pointers */
 185         unsigned tx_ring;
 186 };
 187 
 188 struct lance_private {
 189         /* The Tx and Rx ring entries must be aligned on 8-byte boundaries.
 190            This is always true for kmalloc'ed memory */
 191         struct lance_rx_head rx_ring[RX_RING_SIZE];
 192         struct lance_tx_head tx_ring[TX_RING_SIZE];
 193         struct lance_init_block         init_block;
 194         const char *name;
 195         /* The saved address of a sent-in-place packet/buffer, for skfree(). */
 196         struct sk_buff* tx_skbuff[TX_RING_SIZE];
 197         long rx_buffs;                          /* Address of Rx and Tx buffers. */
 198         /* Tx low-memory "bounce buffer" address. */
 199         char (*tx_bounce_buffs)[PKT_BUF_SZ];
 200         int cur_rx, cur_tx;                     /* The next free ring entry */
 201         int dirty_rx, dirty_tx;         /* The ring entries to be free()ed. */
 202         int dma;
 203         struct enet_statistics stats;
 204         unsigned char chip_version;                     /* See lance_chip_type. */
 205         char tx_full;
 206         char lock;
 207 };
 208 
 209 #define LANCE_MUST_PAD          0x00000001
 210 #define LANCE_ENABLE_AUTOSELECT 0x00000002
 211 #define LANCE_MUST_REINIT_RING  0x00000004
 212 #define LANCE_MUST_UNRESET      0x00000008
 213 #define LANCE_HAS_MISSED_FRAME  0x00000010
 214 
 215 /* A mapping from the chip ID number to the part number and features.
 216    These are from the datasheets -- in real life the '970 version
 217    reportedly has the same ID as the '965. */
 218 static struct lance_chip_type {
 219         int id_number;
 220         const char *name;
 221         int flags;
 222 } chip_table[] = {
 223         {0x0000, "LANCE 7990",                          /* Ancient lance chip.  */
 224                 LANCE_MUST_PAD + LANCE_MUST_UNRESET},
 225         {0x0003, "PCnet/ISA 79C960",            /* 79C960 PCnet/ISA.  */
 226                 LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
 227                         LANCE_HAS_MISSED_FRAME},
 228         {0x2260, "PCnet/ISA+ 79C961",           /* 79C961 PCnet/ISA+, Plug-n-Play.  */
 229                 LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
 230                         LANCE_HAS_MISSED_FRAME},
 231         {0x2420, "PCnet/PCI 79C970",            /* 79C970 or 79C974 PCnet-SCSI, PCI. */
 232                 LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
 233                         LANCE_HAS_MISSED_FRAME},
 234         /* Bug: the PCnet/PCI actually uses the PCnet/VLB ID number, so just call
 235                 it the PCnet32. */
 236         {0x2430, "PCnet32",                                     /* 79C965 PCnet for VL bus. */
 237                 LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
 238                         LANCE_HAS_MISSED_FRAME},
 239         {0x0,    "PCnet (unknown)",
 240                 LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
 241                         LANCE_HAS_MISSED_FRAME},
 242 };
 243 
 244 enum {OLD_LANCE = 0, PCNET_ISA=1, PCNET_ISAP=2, PCNET_PCI=3, PCNET_VLB=4, LANCE_UNKNOWN=5};
 245 
 246 /* Non-zero only if the current card is a PCI with BIOS-set IRQ. */
 247 static unsigned char pci_irq_line = 0;
 248 
 249 /* Non-zero if lance_probe1() needs to allocate low-memory bounce buffers.
 250    Assume yes until we know the memory size. */
 251 static unsigned char lance_need_isa_bounce_buffers = 1;
 252 
 253 static int lance_open(struct device *dev);
 254 static void lance_init_ring(struct device *dev);
 255 static int lance_start_xmit(struct sk_buff *skb, struct device *dev);
 256 static int lance_rx(struct device *dev);
 257 static void lance_interrupt(int irq, struct pt_regs *regs);
 258 static int lance_close(struct device *dev);
 259 static struct enet_statistics *lance_get_stats(struct device *dev);
 260 static void set_multicast_list(struct device *dev);
 261 
 262 
 263 
 264 /* This lance probe is unlike the other board probes in 1.0.*.  The LANCE may
 265    have to allocate a contiguous low-memory region for bounce buffers.
 266    This requirement is satisfied by having the lance initialization occur
 267    before the memory management system is started, and thus well before the
 268    other probes. */
 269 
 270 int lance_init(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 271 {
 272         int *port;
 273 
 274         if (high_memory <= 16*1024*1024)
 275                 lance_need_isa_bounce_buffers = 0;
 276 
 277 #if defined(CONFIG_PCI)
 278     if (pcibios_present()) {
 279             int pci_index;
 280                 printk("lance.c: PCI bios is present, checking for devices...\n");
 281                 for (pci_index = 0; pci_index < 8; pci_index++) {
 282                         unsigned char pci_bus, pci_device_fn;
 283                         unsigned int pci_ioaddr;
 284                         unsigned short pci_command;
 285 
 286                         if (pcibios_find_device (PCI_VENDOR_ID_AMD,
 287                                                                          PCI_DEVICE_ID_AMD_LANCE, pci_index,
 288                                                                          &pci_bus, &pci_device_fn) != 0)
 289                                 break;
 290                         pcibios_read_config_byte(pci_bus, pci_device_fn,
 291                                                                          PCI_INTERRUPT_LINE, &pci_irq_line);
 292                         pcibios_read_config_dword(pci_bus, pci_device_fn,
 293                                                                           PCI_BASE_ADDRESS_0, &pci_ioaddr);
 294                         /* Remove I/O space marker in bit 0. */
 295                         pci_ioaddr &= ~3;
 296                         /* PCI Spec 2.1 states that it is either the driver or PCI card's
 297                          * responsibility to set the PCI Master Enable Bit if needed.
 298                          *      (From Mark Stockton <marks@schooner.sys.hou.compaq.com>)
 299                          */
 300                         pcibios_read_config_word(pci_bus, pci_device_fn,
 301                                                                          PCI_COMMAND, &pci_command);
 302                         if ( ! (pci_command & PCI_COMMAND_MASTER)) {
 303                                 printk("PCI Master Bit has not been set. Setting...\n");
 304                                 pci_command |= PCI_COMMAND_MASTER;
 305                                 pcibios_write_config_word(pci_bus, pci_device_fn,
 306                                                                                   PCI_COMMAND, pci_command);
 307                         }
 308                         printk("Found PCnet/PCI at %#x, irq %d.\n",
 309                                    pci_ioaddr, pci_irq_line);
 310                         lance_probe1(pci_ioaddr);
 311                         pci_irq_line = 0;
 312                 }
 313         }
 314 #endif  /* defined(CONFIG_PCI) */
 315 
 316         for (port = lance_portlist; *port; port++) {
 317                 int ioaddr = *port;
 318 
 319                 if ( check_region(ioaddr, LANCE_TOTAL_SIZE) == 0) {
 320                         /* Detect "normal" 0x57 0x57 and the NI6510EB 0x52 0x44
 321                            signatures w/ minimal I/O reads */
 322                         char offset15, offset14 = inb(ioaddr + 14);
 323                         
 324                         if ((offset14 == 0x52 || offset14 == 0x57) &&
 325                                 ((offset15 = inb(ioaddr + 15)) == 0x57 || offset15 == 0x44))
 326                                 lance_probe1(ioaddr);
 327                 }
 328         }
 329 
 330         return 0;
 331 }
 332 
 333 void lance_probe1(int ioaddr)
     /* [previous][next][first][last][top][bottom][index][help] */
 334 {
 335         struct device *dev;
 336         struct lance_private *lp;
 337         short dma_channels;                                     /* Mark spuriously-busy DMA channels */
 338         int i, reset_val, lance_version;
 339         const char *chipname;
 340         /* Flags for specific chips or boards. */
 341         unsigned char hpJ2405A = 0;                                             /* HP ISA adaptor */
 342         int hp_builtin = 0;                                     /* HP on-board ethernet. */
 343         static int did_version = 0;                     /* Already printed version info. */
 344 
 345         /* First we look for special cases.
 346            Check for HP's on-board ethernet by looking for 'HP' in the BIOS.
 347            There are two HP versions, check the BIOS for the configuration port.
 348            This method provided by L. Julliard, Laurent_Julliard@grenoble.hp.com.
 349            */
 350         if ( *((unsigned short *) 0x000f0102) == 0x5048)  {
 351                 static const short ioaddr_table[] = { 0x300, 0x320, 0x340, 0x360};
 352                 int hp_port = ( *((unsigned char *) 0x000f00f1) & 1)  ? 0x499 : 0x99;
 353                 /* We can have boards other than the built-in!  Verify this is on-board. */
 354                 if ((inb(hp_port) & 0xc0) == 0x80
 355                         && ioaddr_table[inb(hp_port) & 3] == ioaddr)
 356                         hp_builtin = hp_port;
 357         }
 358         /* We also recognize the HP Vectra on-board here, but check below. */
 359         hpJ2405A = (inb(ioaddr) == 0x08 && inb(ioaddr+1) == 0x00
 360                                 && inb(ioaddr+2) == 0x09);
 361 
 362         /* Reset the LANCE.      */
 363         reset_val = inw(ioaddr+LANCE_RESET); /* Reset the LANCE */
 364 
 365         /* The Un-Reset needed is only needed for the real NE2100, and will
 366            confuse the HP board. */
 367         if (!hpJ2405A)
 368                 outw(reset_val, ioaddr+LANCE_RESET);
 369 
 370         outw(0x0000, ioaddr+LANCE_ADDR); /* Switch to window 0 */
 371         if (inw(ioaddr+LANCE_DATA) != 0x0004)
 372                 return;
 373 
 374         /* Get the version of the chip. */
 375         outw(88, ioaddr+LANCE_ADDR);
 376         if (inw(ioaddr+LANCE_ADDR) != 88) {
 377                 lance_version = 0;
 378         } else {                                                        /* Good, it's a newer chip. */
 379                 int chip_version = inw(ioaddr+LANCE_DATA);
 380                 outw(89, ioaddr+LANCE_ADDR);
 381                 chip_version |= inw(ioaddr+LANCE_DATA) << 16;
 382                 if (lance_debug > 2)
 383                         printk("  LANCE chip version is %#x.\n", chip_version);
 384                 if ((chip_version & 0xfff) != 0x003)
 385                         return;
 386                 chip_version = (chip_version >> 12) & 0xffff;
 387                 for (lance_version = 1; chip_table[lance_version].id_number; lance_version++) {
 388                         if (chip_table[lance_version].id_number == chip_version)
 389                                 break;
 390                 }
 391         }
 392 
 393         dev = init_etherdev(0, 0);
 394         chipname = chip_table[lance_version].name;
 395         printk("%s: %s at %#3x,", dev->name, chipname, ioaddr);
 396 
 397         /* There is a 16 byte station address PROM at the base address.
 398            The first six bytes are the station address. */
 399         for (i = 0; i < 6; i++)
 400                 printk(" %2.2x", dev->dev_addr[i] = inb(ioaddr + i));
 401 
 402         dev->base_addr = ioaddr;
 403         request_region(ioaddr, LANCE_TOTAL_SIZE, chip_table[lance_version].name);
 404 
 405         /* Make certain the data structures used by the LANCE are aligned and DMAble. */
 406         lp = (struct lance_private *) kmalloc(sizeof(*lp), GFP_DMA | GFP_KERNEL);
 407         memset(lp, 0, sizeof(*lp));
 408         dev->priv = lp;
 409         lp->name = chipname;
 410         lp->rx_buffs = (unsigned long) kmalloc(PKT_BUF_SZ*RX_RING_SIZE, GFP_DMA | GFP_KERNEL);
 411         lp->tx_bounce_buffs = NULL;
 412         if (lance_need_isa_bounce_buffers)
 413                 lp->tx_bounce_buffs = kmalloc(PKT_BUF_SZ*TX_RING_SIZE, GFP_DMA | GFP_KERNEL);
 414 
 415         lp->chip_version = lance_version;
 416 
 417         lp->init_block.mode = 0x0003;           /* Disable Rx and Tx. */
 418         for (i = 0; i < 6; i++)
 419                 lp->init_block.phys_addr[i] = dev->dev_addr[i];
 420         lp->init_block.filter[0] = 0x00000000;
 421         lp->init_block.filter[1] = 0x00000000;
 422         lp->init_block.rx_ring = (int)lp->rx_ring | RX_RING_LEN_BITS;
 423         lp->init_block.tx_ring = (int)lp->tx_ring | TX_RING_LEN_BITS;
 424 
 425         outw(0x0001, ioaddr+LANCE_ADDR);
 426         inw(ioaddr+LANCE_ADDR);
 427         outw((short) (int) &lp->init_block, ioaddr+LANCE_DATA);
 428         outw(0x0002, ioaddr+LANCE_ADDR);
 429         inw(ioaddr+LANCE_ADDR);
 430         outw(((int)&lp->init_block) >> 16, ioaddr+LANCE_DATA);
 431         outw(0x0000, ioaddr+LANCE_ADDR);
 432         inw(ioaddr+LANCE_ADDR);
 433 
 434         if (pci_irq_line) {
 435                 dev->dma = 4;                   /* Native bus-master, no DMA channel needed. */
 436                 dev->irq = pci_irq_line;
 437         } else if (hp_builtin) {
 438                 static const char dma_tbl[4] = {3, 5, 6, 0};
 439                 static const char irq_tbl[4] = {3, 4, 5, 9};
 440                 unsigned char port_val = inb(hp_builtin);
 441                 dev->dma = dma_tbl[(port_val >> 4) & 3];
 442                 dev->irq = irq_tbl[(port_val >> 2) & 3];
 443                 printk(" HP Vectra IRQ %d DMA %d.\n", dev->irq, dev->dma);
 444         } else if (hpJ2405A) {
 445                 static const char dma_tbl[4] = {3, 5, 6, 7};
 446                 static const char irq_tbl[8] = {3, 4, 5, 9, 10, 11, 12, 15};
 447                 short reset_val = inw(ioaddr+LANCE_RESET);
 448                 dev->dma = dma_tbl[(reset_val >> 2) & 3];
 449                 dev->irq = irq_tbl[(reset_val >> 4) & 7];
 450                 printk(" HP J2405A IRQ %d DMA %d.\n", dev->irq, dev->dma);
 451         } else if (lance_version == PCNET_ISAP) {               /* The plug-n-play version. */
 452                 short bus_info;
 453                 outw(8, ioaddr+LANCE_ADDR);
 454                 bus_info = inw(ioaddr+LANCE_BUS_IF);
 455                 dev->dma = bus_info & 0x07;
 456                 dev->irq = (bus_info >> 4) & 0x0F;
 457         } else {
 458                 /* The DMA channel may be passed in PARAM1. */
 459                 if (dev->mem_start & 0x07)
 460                         dev->dma = dev->mem_start & 0x07;
 461         }
 462 
 463         if (dev->dma == 0) {
 464                 /* Read the DMA channel status register, so that we can avoid
 465                    stuck DMA channels in the DMA detection below. */
 466                 dma_channels = ((inb(DMA1_STAT_REG) >> 4) & 0x0f) |
 467                         (inb(DMA2_STAT_REG) & 0xf0);
 468         }
 469         if (dev->irq >= 2)
 470                 printk(" assigned IRQ %d", dev->irq);
 471         else {
 472                 /* To auto-IRQ we enable the initialization-done and DMA error
 473                    interrupts. For ISA boards we get a DMA error, but VLB and PCI
 474                    boards will work. */
 475                 autoirq_setup(0);
 476 
 477                 /* Trigger an initialization just for the interrupt. */
 478                 outw(0x0041, ioaddr+LANCE_DATA);
 479 
 480                 dev->irq = autoirq_report(1);
 481                 if (dev->irq)
 482                         printk(", probed IRQ %d", dev->irq);
 483                 else {
 484                         printk(", failed to detect IRQ line.\n");
 485                         return;
 486                 }
 487 
 488                 /* Check for the initialization done bit, 0x0100, which means
 489                    that we don't need a DMA channel. */
 490                 if (inw(ioaddr+LANCE_DATA) & 0x0100)
 491                         dev->dma = 4;
 492         }
 493 
 494         if (dev->dma == 4) {
 495                 printk(", no DMA needed.\n");
 496         } else if (dev->dma) {
 497                 if (request_dma(dev->dma, chipname)) {
 498                         printk("DMA %d allocation failed.\n", dev->dma);
 499                         return;
 500                 } else
 501                         printk(", assigned DMA %d.\n", dev->dma);
 502         } else {                        /* OK, we have to auto-DMA. */
 503                 for (i = 0; i < 4; i++) {
 504                         static const char dmas[] = { 5, 6, 7, 3 };
 505                         int dma = dmas[i];
 506                         int boguscnt;
 507 
 508                         /* Don't enable a permanently busy DMA channel, or the machine
 509                            will hang. */
 510                         if (test_bit(dma, &dma_channels))
 511                                 continue;
 512                         outw(0x7f04, ioaddr+LANCE_DATA); /* Clear the memory error bits. */
 513                         if (request_dma(dma, chipname))
 514                                 continue;
 515                         set_dma_mode(dma, DMA_MODE_CASCADE);
 516                         enable_dma(dma);
 517 
 518                         /* Trigger an initialization. */
 519                         outw(0x0001, ioaddr+LANCE_DATA);
 520                         for (boguscnt = 100; boguscnt > 0; --boguscnt)
 521                                 if (inw(ioaddr+LANCE_DATA) & 0x0900)
 522                                         break;
 523                         if (inw(ioaddr+LANCE_DATA) & 0x0100) {
 524                                 dev->dma = dma;
 525                                 printk(", DMA %d.\n", dev->dma);
 526                                 break;
 527                         } else {
 528                                 disable_dma(dma);
 529                                 free_dma(dma);
 530                         }
 531                 }
 532                 if (i == 4) {                   /* Failure: bail. */
 533                         printk("DMA detection failed.\n");
 534                         return;
 535                 }
 536         }
 537 
 538         if (chip_table[lp->chip_version].flags & LANCE_ENABLE_AUTOSELECT) {
 539                 /* Turn on auto-select of media (10baseT or BNC) so that the user
 540                    can watch the LEDs even if the board isn't opened. */
 541                 outw(0x0002, ioaddr+LANCE_ADDR);
 542                 outw(0x0002, ioaddr+LANCE_BUS_IF);
 543         }
 544 
 545         if (lance_debug > 0  &&  did_version++ == 0)
 546                 printk(version);
 547 
 548         /* The LANCE-specific entries in the device structure. */
 549         dev->open = &lance_open;
 550         dev->hard_start_xmit = &lance_start_xmit;
 551         dev->stop = &lance_close;
 552         dev->get_stats = &lance_get_stats;
 553         dev->set_multicast_list = &set_multicast_list;
 554 
 555         return;
 556 }
 557 
 558 
 559 static int
 560 lance_open(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 561 {
 562         struct lance_private *lp = (struct lance_private *)dev->priv;
 563         int ioaddr = dev->base_addr;
 564         int i;
 565 
 566         if (dev->irq == 0 ||
 567                 request_irq(dev->irq, &lance_interrupt, 0, lp->name)) {
 568                 return -EAGAIN;
 569         }
 570 
 571         /* We used to allocate DMA here, but that was silly.
 572            DMA lines can't be shared!  We now permanently snarf them. */
 573 
 574         irq2dev_map[dev->irq] = dev;
 575 
 576         /* Reset the LANCE */
 577         inw(ioaddr+LANCE_RESET);
 578 
 579         /* The DMA controller is used as a no-operation slave, "cascade mode". */
 580         if (dev->dma != 4) {
 581                 enable_dma(dev->dma);
 582                 set_dma_mode(dev->dma, DMA_MODE_CASCADE);
 583         }
 584 
 585         /* Un-Reset the LANCE, needed only for the NE2100. */
 586         if (chip_table[lp->chip_version].flags & LANCE_MUST_UNRESET)
 587                 outw(0, ioaddr+LANCE_RESET);
 588 
 589         if (chip_table[lp->chip_version].flags & LANCE_ENABLE_AUTOSELECT) {
 590                 /* This is 79C960-specific: Turn on auto-select of media (AUI, BNC). */
 591                 outw(0x0002, ioaddr+LANCE_ADDR);
 592                 outw(0x0002, ioaddr+LANCE_BUS_IF);
 593         }
 594 
 595         if (lance_debug > 1)
 596                 printk("%s: lance_open() irq %d dma %d tx/rx rings %#x/%#x init %#x.\n",
 597                            dev->name, dev->irq, dev->dma, (int) lp->tx_ring, (int) lp->rx_ring,
 598                            (int) &lp->init_block);
 599 
 600         lance_init_ring(dev);
 601         /* Re-initialize the LANCE, and start it when done. */
 602         outw(0x0001, ioaddr+LANCE_ADDR);
 603         outw((short) (int) &lp->init_block, ioaddr+LANCE_DATA);
 604         outw(0x0002, ioaddr+LANCE_ADDR);
 605         outw(((int)&lp->init_block) >> 16, ioaddr+LANCE_DATA);
 606 
 607         outw(0x0004, ioaddr+LANCE_ADDR);
 608         outw(0x0915, ioaddr+LANCE_DATA);
 609 
 610         outw(0x0000, ioaddr+LANCE_ADDR);
 611         outw(0x0001, ioaddr+LANCE_DATA);
 612 
 613         dev->tbusy = 0;
 614         dev->interrupt = 0;
 615         dev->start = 1;
 616         i = 0;
 617         while (i++ < 100)
 618                 if (inw(ioaddr+LANCE_DATA) & 0x0100)
 619                         break;
 620         /* 
 621          * We used to clear the InitDone bit, 0x0100, here but Mark Stockton
 622          * reports that doing so triggers a bug in the '974.
 623          */
 624         outw(0x0042, ioaddr+LANCE_DATA);
 625 
 626         if (lance_debug > 2)
 627                 printk("%s: LANCE open after %d ticks, init block %#x csr0 %4.4x.\n",
 628                            dev->name, i, (int) &lp->init_block, inw(ioaddr+LANCE_DATA));
 629 
 630         return 0;                                       /* Always succeed */
 631 }
 632 
 633 /* The LANCE has been halted for one reason or another (busmaster memory
 634    arbitration error, Tx FIFO underflow, driver stopped it to reconfigure,
 635    etc.).  Modern LANCE variants always reload their ring-buffer
 636    configuration when restarted, so we must reinitialize our ring
 637    context before restarting.  As part of this reinitialization,
 638    find all packets still on the Tx ring and pretend that they had been
 639    sent (in effect, drop the packets on the floor) - the higher-level
 640    protocols will time out and retransmit.  It'd be better to shuffle
 641    these skbs to a temp list and then actually re-Tx them after
 642    restarting the chip, but I'm too lazy to do so right now.  dplatt@3do.com
 643 */
 644 
 645 static void 
 646 lance_purge_tx_ring(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 647 {
 648         struct lance_private *lp = (struct lance_private *)dev->priv;
 649         int i;
 650 
 651         for (i = 0; i < TX_RING_SIZE; i++) {
 652                 if (lp->tx_skbuff[i]) {
 653                         dev_kfree_skb(lp->tx_skbuff[i],FREE_WRITE);
 654                         lp->tx_skbuff[i] = NULL;
 655                 }
 656         }
 657 }
 658 
 659 
 660 /* Initialize the LANCE Rx and Tx rings. */
 661 static void
 662 lance_init_ring(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 663 {
 664         struct lance_private *lp = (struct lance_private *)dev->priv;
 665         int i;
 666 
 667         lp->lock = 0, lp->tx_full = 0;
 668         lp->cur_rx = lp->cur_tx = 0;
 669         lp->dirty_rx = lp->dirty_tx = 0;
 670 
 671         for (i = 0; i < RX_RING_SIZE; i++) {
 672                 lp->rx_ring[i].base = (lp->rx_buffs + i*PKT_BUF_SZ) | 0x80000000;
 673                 lp->rx_ring[i].buf_length = -PKT_BUF_SZ;
 674         }
 675         /* The Tx buffer address is filled in as needed, but we do need to clear
 676            the upper ownership bit. */
 677         for (i = 0; i < TX_RING_SIZE; i++) {
 678                 lp->tx_ring[i].base = 0;
 679         }
 680 
 681         lp->init_block.mode = 0x0000;
 682         for (i = 0; i < 6; i++)
 683                 lp->init_block.phys_addr[i] = dev->dev_addr[i];
 684         lp->init_block.filter[0] = 0x00000000;
 685         lp->init_block.filter[1] = 0x00000000;
 686         lp->init_block.rx_ring = (int)lp->rx_ring | RX_RING_LEN_BITS;
 687         lp->init_block.tx_ring = (int)lp->tx_ring | TX_RING_LEN_BITS;
 688 }
 689 
 690 static void
 691 lance_restart(struct device *dev, unsigned int csr0_bits, int must_reinit)
     /* [previous][next][first][last][top][bottom][index][help] */
 692 {
 693         struct lance_private *lp = (struct lance_private *)dev->priv;
 694 
 695         if (must_reinit ||
 696                 (chip_table[lp->chip_version].flags & LANCE_MUST_REINIT_RING)) {
 697                 lance_purge_tx_ring(dev);
 698                 lance_init_ring(dev);
 699         }
 700         outw(0x0000,    dev->base_addr + LANCE_ADDR);
 701         outw(csr0_bits, dev->base_addr + LANCE_DATA);
 702 }
 703 
 704 static int
 705 lance_start_xmit(struct sk_buff *skb, struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 706 {
 707         struct lance_private *lp = (struct lance_private *)dev->priv;
 708         int ioaddr = dev->base_addr;
 709         int entry;
 710         unsigned long flags;
 711 
 712         /* Transmitter timeout, serious problems. */
 713         if (dev->tbusy) {
 714                 int tickssofar = jiffies - dev->trans_start;
 715                 if (tickssofar < 20)
 716                         return 1;
 717                 outw(0, ioaddr+LANCE_ADDR);
 718                 printk("%s: transmit timed out, status %4.4x, resetting.\n",
 719                            dev->name, inw(ioaddr+LANCE_DATA));
 720                 outw(0x0004, ioaddr+LANCE_DATA);
 721                 lp->stats.tx_errors++;
 722 #ifndef final_version
 723                 {
 724                         int i;
 725                         printk(" Ring data dump: dirty_tx %d cur_tx %d%s cur_rx %d.",
 726                                    lp->dirty_tx, lp->cur_tx, lp->tx_full ? " (full)" : "",
 727                                    lp->cur_rx);
 728                         for (i = 0 ; i < RX_RING_SIZE; i++)
 729                                 printk("%s %08x %04x %04x", i & 0x3 ? "" : "\n ",
 730                                            lp->rx_ring[i].base, -lp->rx_ring[i].buf_length,
 731                                            lp->rx_ring[i].msg_length);
 732                         for (i = 0 ; i < TX_RING_SIZE; i++)
 733                                 printk("%s %08x %04x %04x", i & 0x3 ? "" : "\n ",
 734                                            lp->tx_ring[i].base, -lp->tx_ring[i].length,
 735                                            lp->tx_ring[i].misc);
 736                         printk("\n");
 737                 }
 738 #endif
 739                 lance_restart(dev, 0x0043, 1);
 740 
 741                 dev->tbusy=0;
 742                 dev->trans_start = jiffies;
 743 
 744                 return 0;
 745         }
 746 
 747         if (skb == NULL) {
 748                 dev_tint(dev);
 749                 return 0;
 750         }
 751 
 752         if (skb->len <= 0)
 753                 return 0;
 754 
 755         if (lance_debug > 3) {
 756                 outw(0x0000, ioaddr+LANCE_ADDR);
 757                 printk("%s: lance_start_xmit() called, csr0 %4.4x.\n", dev->name,
 758                            inw(ioaddr+LANCE_DATA));
 759                 outw(0x0000, ioaddr+LANCE_DATA);
 760         }
 761 
 762         /* Block a timer-based transmit from overlapping.  This could better be
 763            done with atomic_swap(1, dev->tbusy), but set_bit() works as well. */
 764         if (set_bit(0, (void*)&dev->tbusy) != 0) {
 765                 printk("%s: Transmitter access conflict.\n", dev->name);
 766                 return 1;
 767         }
 768 
 769         if (set_bit(0, (void*)&lp->lock) != 0) {
 770                 if (lance_debug > 0)
 771                         printk("%s: tx queue lock!.\n", dev->name);
 772                 /* don't clear dev->tbusy flag. */
 773                 return 1;
 774         }
 775 
 776         /* Fill in a Tx ring entry */
 777 
 778         /* Mask to ring buffer boundary. */
 779         entry = lp->cur_tx & TX_RING_MOD_MASK;
 780 
 781         /* Caution: the write order is important here, set the base address
 782            with the "ownership" bits last. */
 783 
 784         /* The old LANCE chips doesn't automatically pad buffers to min. size. */
 785         if (chip_table[lp->chip_version].flags & LANCE_MUST_PAD) {
 786                 lp->tx_ring[entry].length =
 787                         -(ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN);
 788         } else
 789                 lp->tx_ring[entry].length = -skb->len;
 790 
 791         lp->tx_ring[entry].misc = 0x0000;
 792 
 793         /* If any part of this buffer is >16M we must copy it to a low-memory
 794            buffer. */
 795         if ((int)(skb->data) + skb->len > 0x01000000) {
 796                 if (lance_debug > 5)
 797                         printk("%s: bouncing a high-memory packet (%#x).\n",
 798                                    dev->name, (int)(skb->data));
 799                 memcpy(&lp->tx_bounce_buffs[entry], skb->data, skb->len);
 800                 lp->tx_ring[entry].base =
 801                         (int)(lp->tx_bounce_buffs + entry) | 0x83000000;
 802                 dev_kfree_skb (skb, FREE_WRITE);
 803         } else {
 804                 lp->tx_skbuff[entry] = skb;
 805                 lp->tx_ring[entry].base = (int)(skb->data) | 0x83000000;
 806         }
 807         lp->cur_tx++;
 808 
 809         /* Trigger an immediate send poll. */
 810         outw(0x0000, ioaddr+LANCE_ADDR);
 811         outw(0x0048, ioaddr+LANCE_DATA);
 812 
 813         dev->trans_start = jiffies;
 814 
 815         save_flags(flags);
 816         cli();
 817         lp->lock = 0;
 818         if (lp->tx_ring[(entry+1) & TX_RING_MOD_MASK].base == 0)
 819                 dev->tbusy=0;
 820         else
 821                 lp->tx_full = 1;
 822         restore_flags(flags);
 823 
 824         return 0;
 825 }
 826 
 827 /* The LANCE interrupt handler. */
 828 static void
 829 lance_interrupt(int irq, struct pt_regs * regs)
     /* [previous][next][first][last][top][bottom][index][help] */
 830 {
 831         struct device *dev = (struct device *)(irq2dev_map[irq]);
 832         struct lance_private *lp;
 833         int csr0, ioaddr, boguscnt=10;
 834         int must_restart;
 835 
 836         if (dev == NULL) {
 837                 printk ("lance_interrupt(): irq %d for unknown device.\n", irq);
 838                 return;
 839         }
 840 
 841         ioaddr = dev->base_addr;
 842         lp = (struct lance_private *)dev->priv;
 843         if (dev->interrupt)
 844                 printk("%s: Re-entering the interrupt handler.\n", dev->name);
 845 
 846         dev->interrupt = 1;
 847 
 848         outw(0x00, dev->base_addr + LANCE_ADDR);
 849         while ((csr0 = inw(dev->base_addr + LANCE_DATA)) & 0x8600
 850                    && --boguscnt >= 0) {
 851                 /* Acknowledge all of the current interrupt sources ASAP. */
 852                 outw(csr0 & ~0x004f, dev->base_addr + LANCE_DATA);
 853 
 854                 must_restart = 0;
 855 
 856                 if (lance_debug > 5)
 857                         printk("%s: interrupt  csr0=%#2.2x new csr=%#2.2x.\n",
 858                                    dev->name, csr0, inw(dev->base_addr + LANCE_DATA));
 859 
 860                 if (csr0 & 0x0400)                      /* Rx interrupt */
 861                         lance_rx(dev);
 862 
 863                 if (csr0 & 0x0200) {            /* Tx-done interrupt */
 864                         int dirty_tx = lp->dirty_tx;
 865 
 866                         while (dirty_tx < lp->cur_tx) {
 867                                 int entry = dirty_tx & TX_RING_MOD_MASK;
 868                                 int status = lp->tx_ring[entry].base;
 869                         
 870                                 if (status < 0)
 871                                         break;                  /* It still hasn't been Txed */
 872 
 873                                 lp->tx_ring[entry].base = 0;
 874 
 875                                 if (status & 0x40000000) {
 876                                         /* There was an major error, log it. */
 877                                         int err_status = lp->tx_ring[entry].misc;
 878                                         lp->stats.tx_errors++;
 879                                         if (err_status & 0x0400) lp->stats.tx_aborted_errors++;
 880                                         if (err_status & 0x0800) lp->stats.tx_carrier_errors++;
 881                                         if (err_status & 0x1000) lp->stats.tx_window_errors++;
 882                                         if (err_status & 0x4000) {
 883                                                 /* Ackk!  On FIFO errors the Tx unit is turned off! */
 884                                                 lp->stats.tx_fifo_errors++;
 885                                                 /* Remove this verbosity later! */
 886                                                 printk("%s: Tx FIFO error! Status %4.4x.\n",
 887                                                            dev->name, csr0);
 888                                                 /* Restart the chip. */
 889                                                 must_restart = 1;
 890                                         }
 891                                 } else {
 892                                         if (status & 0x18000000)
 893                                                 lp->stats.collisions++;
 894                                         lp->stats.tx_packets++;
 895                                 }
 896 
 897                                 /* We must free the original skb if it's not a data-only copy
 898                                    in the bounce buffer. */
 899                                 if (lp->tx_skbuff[entry]) {
 900                                         dev_kfree_skb(lp->tx_skbuff[entry],FREE_WRITE);
 901                                         lp->tx_skbuff[entry] = 0;
 902                                 }
 903                                 dirty_tx++;
 904                         }
 905 
 906 #ifndef final_version
 907                         if (lp->cur_tx - dirty_tx >= TX_RING_SIZE) {
 908                                 printk("out-of-sync dirty pointer, %d vs. %d, full=%d.\n",
 909                                            dirty_tx, lp->cur_tx, lp->tx_full);
 910                                 dirty_tx += TX_RING_SIZE;
 911                         }
 912 #endif
 913 
 914                         if (lp->tx_full && dev->tbusy
 915                                 && dirty_tx > lp->cur_tx - TX_RING_SIZE + 2) {
 916                                 /* The ring is no longer full, clear tbusy. */
 917                                 lp->tx_full = 0;
 918                                 dev->tbusy = 0;
 919                                 mark_bh(NET_BH);
 920                         }
 921 
 922                         lp->dirty_tx = dirty_tx;
 923                 }
 924 
 925                 /* Log misc errors. */
 926                 if (csr0 & 0x4000) lp->stats.tx_errors++; /* Tx babble. */
 927                 if (csr0 & 0x1000) lp->stats.rx_errors++; /* Missed a Rx frame. */
 928                 if (csr0 & 0x0800) {
 929                         printk("%s: Bus master arbitration failure, status %4.4x.\n",
 930                                    dev->name, csr0);
 931                         /* Restart the chip. */
 932                         must_restart = 1;
 933                 }
 934 
 935                 if (must_restart) {
 936                         /* stop the chip to clear the error condition, then restart */
 937                         outw(0x0000, dev->base_addr + LANCE_ADDR);
 938                         outw(0x0004, dev->base_addr + LANCE_DATA);
 939                         lance_restart(dev, 0x0002, 0);
 940                 }
 941         }
 942 
 943     /* Clear any other interrupt, and set interrupt enable. */
 944     outw(0x0000, dev->base_addr + LANCE_ADDR);
 945     outw(0x7940, dev->base_addr + LANCE_DATA);
 946 
 947         if (lance_debug > 4)
 948                 printk("%s: exiting interrupt, csr%d=%#4.4x.\n",
 949                            dev->name, inw(ioaddr + LANCE_ADDR),
 950                            inw(dev->base_addr + LANCE_DATA));
 951 
 952         dev->interrupt = 0;
 953         return;
 954 }
 955 
 956 static int
 957 lance_rx(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 958 {
 959         struct lance_private *lp = (struct lance_private *)dev->priv;
 960         int entry = lp->cur_rx & RX_RING_MOD_MASK;
 961         int i;
 962                 
 963         /* If we own the next entry, it's a new packet. Send it up. */
 964         while (lp->rx_ring[entry].base >= 0) {
 965                 int status = lp->rx_ring[entry].base >> 24;
 966 
 967                 if (status != 0x03) {                   /* There was an error. */
 968                         /* There is a tricky error noted by John Murphy,
 969                            <murf@perftech.com> to Russ Nelson: Even with full-sized
 970                            buffers it's possible for a jabber packet to use two
 971                            buffers, with only the last correctly noting the error. */
 972                         if (status & 0x01)      /* Only count a general error at the */
 973                                 lp->stats.rx_errors++; /* end of a packet.*/
 974                         if (status & 0x20) lp->stats.rx_frame_errors++;
 975                         if (status & 0x10) lp->stats.rx_over_errors++;
 976                         if (status & 0x08) lp->stats.rx_crc_errors++;
 977                         if (status & 0x04) lp->stats.rx_fifo_errors++;
 978                         lp->rx_ring[entry].base &= 0x03ffffff;
 979                 } else {
 980                         /* Malloc up new buffer, compatible with net-2e. */
 981                         short pkt_len = (lp->rx_ring[entry].msg_length & 0xfff)-4;
 982                         struct sk_buff *skb;
 983 
 984                         skb = dev_alloc_skb(pkt_len+2);
 985                         if (skb == NULL) {
 986                                 printk("%s: Memory squeeze, deferring packet.\n", dev->name);
 987                                 for (i=0; i < RX_RING_SIZE; i++)
 988                                   if (lp->rx_ring[(entry+i) & RX_RING_MOD_MASK].base < 0)
 989                                         break;
 990 
 991                                 if (i > RX_RING_SIZE -2) {
 992                                   lp->stats.rx_dropped++;
 993                                   lp->rx_ring[entry].base |= 0x80000000;
 994                                   lp->cur_rx++;
 995                                 }
 996                                 break;
 997                         }
 998                         skb->dev = dev;
 999                         skb_reserve(skb,2);     /* 16 byte align */
1000                         skb_put(skb,pkt_len);   /* Make room */
1001                         eth_copy_and_sum(skb,
1002                                    (unsigned char *)(lp->rx_ring[entry].base & 0x00ffffff),
1003                                    pkt_len,0);
1004                         skb->protocol=eth_type_trans(skb,dev);
1005                         netif_rx(skb);
1006                         lp->stats.rx_packets++;
1007                 }
1008 
1009                 /* The docs say that the buffer length isn't touched, but Andrew Boyd
1010                    of QNX reports that some revs of the 79C965 clear it. */
1011                 lp->rx_ring[entry].buf_length = -PKT_BUF_SZ;
1012                 lp->rx_ring[entry].base |= 0x80000000;
1013                 entry = (++lp->cur_rx) & RX_RING_MOD_MASK;
1014         }
1015 
1016         /* We should check that at least two ring entries are free.      If not,
1017            we should free one and mark stats->rx_dropped++. */
1018 
1019         return 0;
1020 }
1021 
1022 static int
1023 lance_close(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
1024 {
1025         int ioaddr = dev->base_addr;
1026         struct lance_private *lp = (struct lance_private *)dev->priv;
1027 
1028         dev->start = 0;
1029         dev->tbusy = 1;
1030 
1031         if (chip_table[lp->chip_version].flags & LANCE_HAS_MISSED_FRAME) {
1032                 outw(112, ioaddr+LANCE_ADDR);
1033                 lp->stats.rx_missed_errors = inw(ioaddr+LANCE_DATA);
1034         }
1035         outw(0, ioaddr+LANCE_ADDR);
1036 
1037         if (lance_debug > 1)
1038                 printk("%s: Shutting down ethercard, status was %2.2x.\n",
1039                            dev->name, inw(ioaddr+LANCE_DATA));
1040 
1041         /* We stop the LANCE here -- it occasionally polls
1042            memory if we don't. */
1043         outw(0x0004, ioaddr+LANCE_DATA);
1044 
1045         if (dev->dma != 4)
1046                 disable_dma(dev->dma);
1047 
1048         free_irq(dev->irq);
1049 
1050         irq2dev_map[dev->irq] = 0;
1051 
1052         return 0;
1053 }
1054 
1055 static struct enet_statistics *
1056 lance_get_stats(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
1057 {
1058         struct lance_private *lp = (struct lance_private *)dev->priv;
1059         short ioaddr = dev->base_addr;
1060         short saved_addr;
1061         unsigned long flags;
1062 
1063         if (chip_table[lp->chip_version].flags & LANCE_HAS_MISSED_FRAME) {
1064                 save_flags(flags);
1065                 cli();
1066                 saved_addr = inw(ioaddr+LANCE_ADDR);
1067                 outw(112, ioaddr+LANCE_ADDR);
1068                 lp->stats.rx_missed_errors = inw(ioaddr+LANCE_DATA);
1069                 outw(saved_addr, ioaddr+LANCE_ADDR);
1070                 restore_flags(flags);
1071         }
1072 
1073         return &lp->stats;
1074 }
1075 
1076 /* Set or clear the multicast filter for this adaptor.
1077  */
1078 
1079 static void set_multicast_list(struct device *dev)
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1080 {
1081         short ioaddr = dev->base_addr;
1082 
1083         outw(0, ioaddr+LANCE_ADDR);
1084         outw(0x0004, ioaddr+LANCE_DATA); /* Temporarily stop the lance.  */
1085 
1086         if (dev->flags&IFF_PROMISC) {
1087                 /* Log any net taps. */
1088                 printk("%s: Promiscuous mode enabled.\n", dev->name);
1089                 outw(15, ioaddr+LANCE_ADDR);
1090                 outw(0x8000, ioaddr+LANCE_DATA); /* Set promiscuous mode */
1091         } else {
1092                 short multicast_table[4];
1093                 int i;
1094                 int num_addrs=dev->mc_count;
1095                 if(dev->flags&IFF_ALLMULTI)
1096                         num_addrs=1;
1097                 /* FIXIT: We don't use the multicast table, but rely on upper-layer filtering. */
1098                 memset(multicast_table, (num_addrs == 0) ? 0 : -1, sizeof(multicast_table));
1099                 for (i = 0; i < 4; i++) {
1100                         outw(8 + i, ioaddr+LANCE_ADDR);
1101                         outw(multicast_table[i], ioaddr+LANCE_DATA);
1102                 }
1103                 outw(15, ioaddr+LANCE_ADDR);
1104                 outw(0x0000, ioaddr+LANCE_DATA); /* Unset promiscuous mode */
1105         }
1106 
1107         lance_restart(dev, 0x0142, 0); /*  Resume normal operation */
1108 
1109 }
1110 
1111 
1112 /*
1113  * Local variables:
1114  *  compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -m486 -c lance.c"
1115  *  c-indent-level: 4
1116  *  tab-width: 4
1117  * End:
1118  */

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