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_init_ring
  5. lance_start_xmit
  6. lance_interrupt
  7. lance_rx
  8. lance_close
  9. lance_get_stats
  10. set_multicast_list

   1 /* lance.c: An AMD LANCE ethernet driver for linux. */
   2 /*
   3         Written 1993-94 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 char *version = "lance.c:v1.06 11/29/94 becker@cesdis.gsfc.nasa.gov\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 struct device *init_etherdev(struct device *dev, int sizeof_private,
  40                                                          unsigned long *mem_startp);
  41 static unsigned int lance_portlist[] = {0x300, 0x320, 0x340, 0x360, 0};
  42 unsigned long lance_probe1(int ioaddr, unsigned long mem_start);
  43 
  44 #ifdef HAVE_DEVLIST
  45 struct netdev_entry lance_drv =
  46 {"lance", lance_probe1, LANCE_TOTAL_SIZE, lance_portlist};
  47 #endif
  48 
  49 #ifdef LANCE_DEBUG
  50 int lance_debug = LANCE_DEBUG;
  51 #else
  52 int lance_debug = 1;
  53 #endif
  54 
  55 /*
  56                                 Theory of Operation
  57 
  58 I. Board Compatibility
  59 
  60 This device driver is designed for the AMD 79C960, the "PCnet-ISA
  61 single-chip ethernet controller for ISA".  This chip is used in a wide
  62 variety of boards from vendors such as Allied Telesis, HP, Kingston,
  63 and Boca.  This driver is also intended to work with older AMD 7990
  64 designs, such as the NE1500 and NE2100, and newer 79C961.  For convenience,
  65 I use the name LANCE to refer to all of the AMD chips, even though it properly
  66 refers only to the original 7990.
  67 
  68 II. Board-specific settings
  69 
  70 The driver is designed to work the boards that use the faster
  71 bus-master mode, rather than in shared memory mode.      (Only older designs
  72 have on-board buffer memory needed to support the slower shared memory mode.)
  73 
  74 Most ISA boards have jumpered settings for the I/O base, IRQ line, and DMA
  75 channel.  This driver probes the likely base addresses:
  76 {0x300, 0x320, 0x340, 0x360}.
  77 After the board is found it generates a DMA-timeout interrupt and uses
  78 autoIRQ to find the IRQ line.  The DMA channel can be set with the low bits
  79 of the otherwise-unused dev->mem_start value (aka PARAM1).  If unset it is
  80 probed for by enabling each free DMA channel in turn and checking if
  81 initialization succeeds.
  82 
  83 The HP-J2405A board is an exception: with this board it's easy to read the
  84 EEPROM-set values for the base, IRQ, and DMA.  (Of course you must already
  85 _know_ the base address -- that field is for writing the EEPROM.)
  86 
  87 III. Driver operation
  88 
  89 IIIa. Ring buffers
  90 The LANCE uses ring buffers of Tx and Rx descriptors.  Each entry describes
  91 the base and length of the data buffer, along with status bits.  The length
  92 of these buffers is set by LANCE_LOG_{RX,TX}_BUFFERS, which is log_2() of
  93 the buffer length (rather than being directly the buffer length) for
  94 implementation ease.  The current values are 2 (Tx) and 4 (Rx), which leads to
  95 ring sizes of 4 (Tx) and 16 (Rx).  Increasing the number of ring entries
  96 needlessly uses extra space and reduces the chance that an upper layer will
  97 be able to reorder queued Tx packets based on priority.  Decreasing the number
  98 of entries makes it more difficult to achieve back-to-back packet transmission
  99 and increases the chance that Rx ring will overflow.  (Consider the worst case
 100 of receiving back-to-back minimum-sized packets.)
 101 
 102 The LANCE has the capability to "chain" both Rx and Tx buffers, but this driver
 103 statically allocates full-sized (slightly oversized -- PKT_BUF_SZ) buffers to
 104 avoid the administrative overhead. For the Rx side this avoids dynamically
 105 allocating full-sized buffers "just in case", at the expense of a
 106 memory-to-memory data copy for each packet received.  For most systems this
 107 is a good tradeoff: the Rx buffer will always be in low memory, the copy
 108 is inexpensive, and it primes the cache for later packet processing.  For Tx
 109 the buffers are only used when needed as low-memory bounce buffers.
 110 
 111 IIIB. 16M memory limitations.
 112 For the ISA bus master mode all structures used directly by the LANCE,
 113 the initialization block, Rx and Tx rings, and data buffers, must be
 114 accessible from the ISA bus, i.e. in the lower 16M of real memory.
 115 This is a problem for current Linux kernels on >16M machines. The network
 116 devices are initialized after memory initialization, and the kernel doles out
 117 memory from the top of memory downward.  The current solution is to have a
 118 special network initialization routine that's called before memory
 119 initialization; this will eventually be generalized for all network devices.
 120 As mentioned before, low-memory "bounce-buffers" are used when needed.
 121 
 122 IIIC. Synchronization
 123 The driver runs as two independent, single-threaded flows of control.  One
 124 is the send-packet routine, which enforces single-threaded use by the
 125 dev->tbusy flag.  The other thread is the interrupt handler, which is single
 126 threaded by the hardware and other software.
 127 
 128 The send packet thread has partial control over the Tx ring and 'dev->tbusy'
 129 flag.  It sets the tbusy flag whenever it's queuing a Tx packet. If the next
 130 queue slot is empty, it clears the tbusy flag when finished otherwise it sets
 131 the 'lp->tx_full' flag.
 132 
 133 The interrupt handler has exclusive control over the Rx ring and records stats
 134 from the Tx ring.  (The Tx-done interrupt can't be selectively turned off, so
 135 we can't avoid the interrupt overhead by having the Tx routine reap the Tx
 136 stats.)  After reaping the stats, it marks the queue entry as empty by setting
 137 the 'base' to zero.      Iff the 'lp->tx_full' flag is set, it clears both the
 138 tx_full and tbusy flags.
 139 
 140 */
 141 
 142 /* Set the number of Tx and Rx buffers, using Log_2(# buffers).
 143    Reasonable default values are 4 Tx buffers, and 16 Rx buffers.
 144    That translates to 2 (4 == 2^^2) and 4 (16 == 2^^4). */
 145 #ifndef LANCE_LOG_TX_BUFFERS
 146 #define LANCE_LOG_TX_BUFFERS 4
 147 #define LANCE_LOG_RX_BUFFERS 4
 148 #endif
 149 
 150 #define TX_RING_SIZE                    (1 << (LANCE_LOG_TX_BUFFERS))
 151 #define TX_RING_MOD_MASK                (TX_RING_SIZE - 1)
 152 #define TX_RING_LEN_BITS                ((LANCE_LOG_TX_BUFFERS) << 29)
 153 
 154 #define RX_RING_SIZE                    (1 << (LANCE_LOG_RX_BUFFERS))
 155 #define RX_RING_MOD_MASK                (RX_RING_SIZE - 1)
 156 #define RX_RING_LEN_BITS                ((LANCE_LOG_RX_BUFFERS) << 29)
 157 
 158 #define PKT_BUF_SZ              1544
 159 
 160 /* Offsets from base I/O address. */
 161 #define LANCE_DATA 0x10
 162 #define LANCE_ADDR 0x12
 163 #define LANCE_RESET 0x14
 164 #define LANCE_BUS_IF 0x16
 165 #define LANCE_TOTAL_SIZE 0x18
 166 
 167 /* The LANCE Rx and Tx ring descriptors. */
 168 struct lance_rx_head {
 169         int base;
 170         short buf_length;                       /* This length is 2s complement (negative)! */
 171         short msg_length;                       /* This length is "normal". */
 172 };
 173 
 174 struct lance_tx_head {
 175         int       base;
 176         short length;                           /* Length is 2s complement (negative)! */
 177         short misc;
 178 };
 179 
 180 /* The LANCE initialization block, described in databook. */
 181 struct lance_init_block {
 182         unsigned short mode;            /* Pre-set mode (reg. 15) */
 183         unsigned char phys_addr[6]; /* Physical ethernet address */
 184         unsigned filter[2];                     /* Multicast filter (unused). */
 185         /* Receive and transmit ring base, along with extra bits. */
 186         unsigned rx_ring;                       /* Tx and Rx ring base pointers */
 187         unsigned tx_ring;
 188 };
 189 
 190 struct lance_private {
 191         char devname[8];
 192         /* The Tx and Rx ring entries must aligned on 8-byte boundaries. */
 193         struct lance_rx_head rx_ring[RX_RING_SIZE];
 194         struct lance_tx_head tx_ring[TX_RING_SIZE];
 195         struct lance_init_block         init_block;
 196         /* The saved address of a sent-in-place packet/buffer, for skfree(). */
 197         struct sk_buff* tx_skbuff[TX_RING_SIZE];
 198         long rx_buffs;                          /* Address of Rx and Tx buffers. */
 199         /* Tx low-memory "bounce buffer" address. */
 200         char (*tx_bounce_buffs)[PKT_BUF_SZ];
 201         int cur_rx, cur_tx;                     /* The next free ring entry */
 202         int dirty_rx, dirty_tx;         /* The ring entries to be free()ed. */
 203         int dma;
 204         struct enet_statistics stats;
 205         char chip_version;                      /* See lance_chip_type. */
 206         char tx_full;
 207         char lock;
 208         int pad0, pad1;                         /* Used for 8-byte alignment */
 209 };
 210 
 211 /* A mapping from the chip ID number to the part number and features.
 212    These are from the datasheets -- in real life the '970 version
 213    reportedly has the same ID as the '965. */
 214 static struct lance_chip_type {
 215         int id_number;
 216         char *name;
 217         int flags;
 218 } chip_table[] = {
 219         {0x0000, "LANCE 7990", 0},                      /* Ancient lance chip.  */
 220         {0x0003, "PCnet/ISA 79C960", 0},        /* 79C960 PCnet/ISA.  */
 221         {0x2260, "PCnet/ISA+ 79C961", 0},       /* 79C961 PCnet/ISA+, Plug-n-Play.  */
 222         {0x2420, "PCnet/PCI 79C970", 0},        /* 79C970 or 79C974 PCnet-SCSI, PCI. */
 223         /* Bug: the PCnet/PCI actually uses the PCnet/VLB ID number, so just call
 224                 it the PCnet32. */
 225         {0x2430, "PCnet32", 0},                         /* 79C965 PCnet for VL bus. */
 226         {0x0,    "PCnet (unknown)", 0},
 227 };
 228 
 229 enum {OLD_LANCE = 0, PCNET_ISA=1, PCNET_ISAP=2, PCNET_PCI=3, PCNET_VLB=4, LANCE_UNKNOWN=5};
 230 
 231 /* Non-zero only if the current card is a PCI with BIOS-set IRQ. */
 232 static unsigned char pci_irq_line = 0;
 233 
 234 static int lance_open(struct device *dev);
 235 static void lance_init_ring(struct device *dev);
 236 static int lance_start_xmit(struct sk_buff *skb, struct device *dev);
 237 static int lance_rx(struct device *dev);
 238 static void lance_interrupt(int reg_ptr);
 239 static int lance_close(struct device *dev);
 240 static struct enet_statistics *lance_get_stats(struct device *dev);
 241 #ifdef HAVE_MULTICAST
 242 static void set_multicast_list(struct device *dev, int num_addrs, void *addrs);
 243 #endif
 244 
 245 
 246 
 247 /* This lance probe is unlike the other board probes in 1.0.*.  The LANCE may
 248    have to allocate a contiguous low-memory region for bounce buffers.
 249    This requirement is satisfied by having the lance initialization occur
 250    before the memory management system is started, and thus well before the
 251    other probes. */
 252 
 253 unsigned long lance_init(unsigned long mem_start, unsigned long mem_end)
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 254 {
 255         int *port;
 256 
 257 #if defined(CONFIG_PCI)
 258 #define AMD_VENDOR_ID 0x1022
 259 #define AMD_DEVICE_ID 0x2000
 260     if (pcibios_present()) {
 261             int pci_index;
 262                 printk("lance.c: PCI bios is present, checking for devices...\n");
 263                 for (pci_index = 0; pci_index < 8; pci_index++) {
 264                         unsigned char pci_bus, pci_device_fn;
 265                         unsigned long pci_ioaddr;
 266                 
 267                         if (pcibios_find_device (AMD_VENDOR_ID, AMD_DEVICE_ID, pci_index,
 268                                                                          &pci_bus, &pci_device_fn) != 0)
 269                                 break;
 270                         pcibios_read_config_byte(pci_bus, pci_device_fn,
 271                                                                          PCI_INTERRUPT_LINE, &pci_irq_line);
 272                         pcibios_read_config_dword(pci_bus, pci_device_fn,
 273                                                                           PCI_BASE_ADDRESS_0, &pci_ioaddr);
 274                         /* Remove I/O space marker in bit 0. */
 275                         pci_ioaddr &= ~3;
 276                         printk("Found PCnet/PCI at %#lx, irq %d (mem_start is %#lx).\n",
 277                                    pci_ioaddr, pci_irq_line, mem_start);
 278                         mem_start = lance_probe1(pci_ioaddr, mem_start);
 279                         pci_irq_line = 0;
 280                 }
 281         }
 282 #endif  /* defined(CONFIG_PCI) */
 283 
 284         for (port = lance_portlist; *port; port++) {
 285                 int ioaddr = *port;
 286 
 287                 if (   check_region(ioaddr, LANCE_TOTAL_SIZE) == 0
 288                         && inb(ioaddr + 14) == 0x57
 289                         && inb(ioaddr + 15) == 0x57) {
 290                         mem_start = lance_probe1(ioaddr, mem_start);
 291                 }
 292         }
 293 
 294         return mem_start;
 295 }
 296 
 297 unsigned long lance_probe1(int ioaddr, unsigned long mem_start)
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 298 {
 299         struct device *dev;
 300         struct lance_private *lp;
 301         short dma_channels;                                     /* Mark spuriously-busy DMA channels */
 302         int i, reset_val, lance_version;
 303         /* Flags for specific chips or boards. */
 304         unsigned char hpJ2405A = 0;                                             /* HP ISA adaptor */
 305         int hp_builtin = 0;                                     /* HP on-board ethernet. */
 306         static int did_version = 0;                     /* Already printed version info. */
 307 
 308         /* First we look for special cases.
 309            Check for HP's on-board ethernet by looking for 'HP' in the BIOS.
 310            There are two HP versions, check the BIOS for the configuration port.
 311            This method provided by L. Julliard, Laurent_Julliard@grenoble.hp.com.
 312            */
 313         if ( *((unsigned short *) 0x000f0102) == 0x5048)  {
 314                 short ioaddr_table[] = { 0x300, 0x320, 0x340, 0x360};
 315                 int hp_port = ( *((unsigned char *) 0x000f00f1) & 1)  ? 0x499 : 0x99;
 316                 /* We can have boards other than the built-in!  Verify this is on-board. */
 317                 if ((inb(hp_port) & 0xc0) == 0x80
 318                         && ioaddr_table[inb(hp_port) & 3] == ioaddr)
 319                         hp_builtin = hp_port;
 320         }
 321         /* We also recognize the HP Vectra on-board here, but check below. */
 322         hpJ2405A = (inb(ioaddr) == 0x08 && inb(ioaddr+1) == 0x00
 323                                 && inb(ioaddr+2) == 0x09);
 324 
 325         /* Reset the LANCE.      */
 326         reset_val = inw(ioaddr+LANCE_RESET); /* Reset the LANCE */
 327 
 328         /* The Un-Reset needed is only needed for the real NE2100, and will
 329            confuse the HP board. */
 330         if (!hpJ2405A)
 331                 outw(reset_val, ioaddr+LANCE_RESET);
 332 
 333         outw(0x0000, ioaddr+LANCE_ADDR); /* Switch to window 0 */
 334         if (inw(ioaddr+LANCE_DATA) != 0x0004)
 335                 return mem_start;
 336 
 337         /* Get the version of the chip. */
 338         outw(88, ioaddr+LANCE_ADDR);
 339         if (inw(ioaddr+LANCE_ADDR) != 88) {
 340                 lance_version = 0;
 341         } else {                                                        /* Good, it's a newer chip. */
 342                 int chip_version = inw(ioaddr+LANCE_DATA);
 343                 outw(89, ioaddr+LANCE_ADDR);
 344                 chip_version |= inw(ioaddr+LANCE_DATA) << 16;
 345                 if (lance_debug > 2)
 346                         printk("  LANCE chip version is %#x.\n", chip_version);
 347                 if ((chip_version & 0xfff) != 0x003)
 348                         return mem_start;
 349                 chip_version = (chip_version >> 12) & 0xffff;
 350                 for (lance_version = 1; chip_table[lance_version].id_number; lance_version++) {
 351                         if (chip_table[lance_version].id_number == chip_version)
 352                                 break;
 353                 }
 354         }
 355 
 356         dev = init_etherdev(0, sizeof(struct lance_private)
 357                                                 + PKT_BUF_SZ*(RX_RING_SIZE + TX_RING_SIZE),
 358                                                 &mem_start);
 359 
 360         printk("%s: %s at %#3x,", dev->name, chip_table[lance_version].name, ioaddr);
 361 
 362         /* There is a 16 byte station address PROM at the base address.
 363            The first six bytes are the station address. */
 364         for (i = 0; i < 6; i++)
 365                 printk(" %2.2x", dev->dev_addr[i] = inb(ioaddr + i));
 366 
 367         dev->base_addr = ioaddr;
 368         snarf_region(ioaddr, LANCE_TOTAL_SIZE);
 369 
 370         /* Make certain the data structures used by the LANCE are aligned. */
 371         dev->priv = (void *)(((int)dev->priv + 7) & ~7);
 372         lp = (struct lance_private *)dev->priv;
 373         lp->rx_buffs = (long)dev->priv + sizeof(struct lance_private);
 374         lp->tx_bounce_buffs = (char (*)[PKT_BUF_SZ])
 375                                                    (lp->rx_buffs + PKT_BUF_SZ*RX_RING_SIZE);
 376 
 377 #ifndef final_version
 378         /* This should never happen. */
 379         if ((int)(lp->rx_ring) & 0x07) {
 380                 printk(" **ERROR** LANCE Rx and Tx rings not on even boundary.\n");
 381                 return mem_start;
 382         }
 383 #endif
 384 
 385         lp->chip_version = lance_version;
 386 
 387         lp->init_block.mode = 0x0003;           /* Disable Rx and Tx. */
 388         for (i = 0; i < 6; i++)
 389                 lp->init_block.phys_addr[i] = dev->dev_addr[i];
 390         lp->init_block.filter[0] = 0x00000000;
 391         lp->init_block.filter[1] = 0x00000000;
 392         lp->init_block.rx_ring = (int)lp->rx_ring | RX_RING_LEN_BITS;
 393         lp->init_block.tx_ring = (int)lp->tx_ring | TX_RING_LEN_BITS;
 394 
 395         outw(0x0001, ioaddr+LANCE_ADDR);
 396         inw(ioaddr+LANCE_ADDR);
 397         outw((short) (int) &lp->init_block, ioaddr+LANCE_DATA);
 398         outw(0x0002, ioaddr+LANCE_ADDR);
 399         inw(ioaddr+LANCE_ADDR);
 400         outw(((int)&lp->init_block) >> 16, ioaddr+LANCE_DATA);
 401         outw(0x0000, ioaddr+LANCE_ADDR);
 402         inw(ioaddr+LANCE_ADDR);
 403 
 404         if (pci_irq_line) {
 405                 dev->dma = 4;                   /* Native bus-master, no DMA channel needed. */
 406                 dev->irq = pci_irq_line;
 407         } else if (hp_builtin) {
 408                 char dma_tbl[4] = {3, 5, 6, 0};
 409                 char irq_tbl[8] = {3, 4, 5, 9};
 410                 unsigned char port_val = inb(hp_builtin);
 411                 dev->dma = dma_tbl[(port_val >> 4) & 3];
 412                 dev->irq = irq_tbl[(port_val >> 2) & 3];
 413                 printk(" HP Vectra IRQ %d DMA %d.\n", dev->irq, dev->dma);
 414         } else if (hpJ2405A) {
 415                 char dma_tbl[4] = {3, 5, 6, 7};
 416                 char irq_tbl[8] = {3, 4, 5, 9, 10, 11, 12, 15};
 417                 short reset_val = inw(ioaddr+LANCE_RESET);
 418                 dev->dma = dma_tbl[(reset_val >> 2) & 3];
 419                 dev->irq = irq_tbl[(reset_val >> 4) & 7];
 420                 printk(" HP J2405A IRQ %d DMA %d.\n", dev->irq, dev->dma);
 421         } else if (lance_version == PCNET_ISAP) {               /* The plug-n-play version. */
 422                 short bus_info;
 423                 outw(8, ioaddr+LANCE_ADDR);
 424                 bus_info = inw(ioaddr+LANCE_BUS_IF);
 425                 dev->dma = bus_info & 0x07;
 426                 dev->irq = (bus_info >> 4) & 0x0F;
 427         } else {
 428                 /* The DMA channel may be passed in PARAM1. */
 429                 if (dev->mem_start & 0x07)
 430                         dev->dma = dev->mem_start & 0x07;
 431         }
 432 
 433         if (dev->dma == 0) {
 434                 /* Read the DMA channel status register, so that we can avoid
 435                    stuck DMA channels in the DMA detection below. */
 436                 dma_channels = ((inb(DMA1_STAT_REG) >> 4) & 0x0f) |
 437                         (inb(DMA2_STAT_REG) & 0xf0);
 438         }
 439         if (dev->irq >= 2)
 440                 printk(" assigned IRQ %d", dev->irq);
 441         else {
 442                 /* To auto-IRQ we enable the initialization-done and DMA error
 443                    interrupts. For ISA boards we get a DMA error, but VLB and PCI
 444                    boards will work. */
 445                 autoirq_setup(0);
 446 
 447                 /* Trigger an initialization just for the interrupt. */
 448                 outw(0x0041, ioaddr+LANCE_DATA);
 449 
 450                 dev->irq = autoirq_report(1);
 451                 if (dev->irq)
 452                         printk(", probed IRQ %d", dev->irq);
 453                 else {
 454                         printk(", failed to detect IRQ line.\n");
 455                         return mem_start;
 456                 }
 457 
 458                 /* Check for the initialization done bit, 0x0100, which means
 459                    that we don't need a DMA channel. */
 460                 if (inw(ioaddr+LANCE_DATA) & 0x0100)
 461                         dev->dma = 4;
 462         }
 463 
 464         if (dev->dma == 4) {
 465                 printk(", no DMA needed.\n");
 466         } else if (dev->dma) {
 467                 if (request_dma(dev->dma, "lance")) {
 468                         printk("DMA %d allocation failed.\n", dev->dma);
 469                         return mem_start;
 470                 } else
 471                         printk(", assigned DMA %d.\n", dev->dma);
 472         } else {                        /* OK, we have to auto-DMA. */
 473                 int dmas[] = { 5, 6, 7, 3 }, boguscnt;
 474 
 475                 for (i = 0; i < 4; i++) {
 476                         int dma = dmas[i];
 477 
 478                         /* Don't enable a permanently busy DMA channel, or the machine
 479                            will hang. */
 480                         if (test_bit(dma, &dma_channels))
 481                                 continue;
 482                         outw(0x7f04, ioaddr+LANCE_DATA); /* Clear the memory error bits. */
 483                         if (request_dma(dma, "lance"))
 484                                 continue;
 485                         set_dma_mode(dma, DMA_MODE_CASCADE);
 486                         enable_dma(dma);
 487 
 488                         /* Trigger an initialization. */
 489                         outw(0x0001, ioaddr+LANCE_DATA);
 490                         for (boguscnt = 100; boguscnt > 0; --boguscnt)
 491                                 if (inw(ioaddr+LANCE_DATA) & 0x0900)
 492                                         break;
 493                         if (inw(ioaddr+LANCE_DATA) & 0x0100) {
 494                                 dev->dma = dma;
 495                                 printk(", DMA %d.\n", dev->dma);
 496                                 break;
 497                         } else {
 498                                 disable_dma(dma);
 499                                 free_dma(dma);
 500                         }
 501                 }
 502                 if (i == 4) {                   /* Failure: bail. */
 503                         printk("DMA detection failed.\n");
 504                         return mem_start;
 505                 }
 506         }
 507 
 508         if (lp->chip_version !=  OLD_LANCE) {
 509                 /* Turn on auto-select of media (10baseT or BNC) so that the user
 510                    can watch the LEDs even if the board isn't opened. */
 511                 outw(0x0002, ioaddr+LANCE_ADDR);
 512                 outw(0x0002, ioaddr+LANCE_BUS_IF);
 513         }
 514 
 515         if (lance_debug > 0  &&  did_version++ == 0)
 516                 printk(version);
 517 
 518         /* The LANCE-specific entries in the device structure. */
 519         dev->open = &lance_open;
 520         dev->hard_start_xmit = &lance_start_xmit;
 521         dev->stop = &lance_close;
 522         dev->get_stats = &lance_get_stats;
 523         dev->set_multicast_list = &set_multicast_list;
 524 
 525         return mem_start;
 526 }
 527 
 528 
 529 static int
 530 lance_open(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 531 {
 532         struct lance_private *lp = (struct lance_private *)dev->priv;
 533         int ioaddr = dev->base_addr;
 534         int i;
 535 
 536         if (dev->irq == 0 ||
 537                 request_irq(dev->irq, &lance_interrupt, 0, "lance")) {
 538                 return -EAGAIN;
 539         }
 540 
 541         /* We used to allocate DMA here, but that was silly.
 542            DMA lines can't be shared!  We now permanently snarf them. */
 543 
 544         irq2dev_map[dev->irq] = dev;
 545 
 546         /* Reset the LANCE */
 547         inw(ioaddr+LANCE_RESET);
 548 
 549         /* The DMA controller is used as a no-operation slave, "cascade mode". */
 550         if (dev->dma != 4) {
 551                 enable_dma(dev->dma);
 552                 set_dma_mode(dev->dma, DMA_MODE_CASCADE);
 553         }
 554 
 555         /* Un-Reset the LANCE, needed only for the NE2100. */
 556         if (lp->chip_version == OLD_LANCE)
 557                 outw(0, ioaddr+LANCE_RESET);
 558 
 559         if (lp->chip_version != OLD_LANCE) {
 560                 /* This is 79C960-specific: Turn on auto-select of media (AUI, BNC). */
 561                 outw(0x0002, ioaddr+LANCE_ADDR);
 562                 outw(0x0002, ioaddr+LANCE_BUS_IF);
 563         }
 564 
 565         if (lance_debug > 1)
 566                 printk("%s: lance_open() irq %d dma %d tx/rx rings %#x/%#x init %#x.\n",
 567                            dev->name, dev->irq, dev->dma, (int) lp->tx_ring, (int) lp->rx_ring,
 568                            (int) &lp->init_block);
 569 
 570         lance_init_ring(dev);
 571         /* Re-initialize the LANCE, and start it when done. */
 572         outw(0x0001, ioaddr+LANCE_ADDR);
 573         outw((short) (int) &lp->init_block, ioaddr+LANCE_DATA);
 574         outw(0x0002, ioaddr+LANCE_ADDR);
 575         outw(((int)&lp->init_block) >> 16, ioaddr+LANCE_DATA);
 576 
 577         outw(0x0004, ioaddr+LANCE_ADDR);
 578         outw(0x0d15, ioaddr+LANCE_DATA);
 579 
 580         outw(0x0000, ioaddr+LANCE_ADDR);
 581         outw(0x0001, ioaddr+LANCE_DATA);
 582 
 583         dev->tbusy = 0;
 584         dev->interrupt = 0;
 585         dev->start = 1;
 586         i = 0;
 587         while (i++ < 100)
 588                 if (inw(ioaddr+LANCE_DATA) & 0x0100)
 589                         break;
 590         outw(0x0142, ioaddr+LANCE_DATA);
 591 
 592         if (lance_debug > 2)
 593                 printk("%s: LANCE open after %d ticks, init block %#x csr0 %4.4x.\n",
 594                            dev->name, i, (int) &lp->init_block, inw(ioaddr+LANCE_DATA));
 595 
 596         return 0;                                       /* Always succeed */
 597 }
 598 
 599 /* Initialize the LANCE Rx and Tx rings. */
 600 static void
 601 lance_init_ring(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 602 {
 603         struct lance_private *lp = (struct lance_private *)dev->priv;
 604         int i;
 605 
 606         lp->lock = 0, lp->tx_full = 0;
 607         lp->cur_rx = lp->cur_tx = 0;
 608         lp->dirty_rx = lp->dirty_tx = 0;
 609 
 610         for (i = 0; i < RX_RING_SIZE; i++) {
 611                 lp->rx_ring[i].base = (lp->rx_buffs + i*PKT_BUF_SZ) | 0x80000000;
 612                 lp->rx_ring[i].buf_length = -PKT_BUF_SZ;
 613         }
 614         /* The Tx buffer address is filled in as needed, but we do need to clear
 615            the upper ownership bit. */
 616         for (i = 0; i < TX_RING_SIZE; i++) {
 617                 lp->tx_ring[i].base = 0;
 618         }
 619 
 620         lp->init_block.mode = 0x0000;
 621         for (i = 0; i < 6; i++)
 622                 lp->init_block.phys_addr[i] = dev->dev_addr[i];
 623         lp->init_block.filter[0] = 0x00000000;
 624         lp->init_block.filter[1] = 0x00000000;
 625         lp->init_block.rx_ring = (int)lp->rx_ring | RX_RING_LEN_BITS;
 626         lp->init_block.tx_ring = (int)lp->tx_ring | TX_RING_LEN_BITS;
 627 }
 628 
 629 static int
 630 lance_start_xmit(struct sk_buff *skb, struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 631 {
 632         struct lance_private *lp = (struct lance_private *)dev->priv;
 633         int ioaddr = dev->base_addr;
 634         int entry;
 635 
 636         /* Transmitter timeout, serious problems. */
 637         if (dev->tbusy) {
 638                 int tickssofar = jiffies - dev->trans_start;
 639                 if (tickssofar < 20)
 640                         return 1;
 641                 outw(0, ioaddr+LANCE_ADDR);
 642                 printk("%s: transmit timed out, status %4.4x, resetting.\n",
 643                            dev->name, inw(ioaddr+LANCE_DATA));
 644                 outw(0x0004, ioaddr+LANCE_DATA);
 645                 lp->stats.tx_errors++;
 646 #ifndef final_version
 647                 {
 648                         int i;
 649                         printk(" Ring data dump: dirty_tx %d cur_tx %d%s cur_rx %d.",
 650                                    lp->dirty_tx, lp->cur_tx, lp->tx_full ? " (full)" : "",
 651                                    lp->cur_rx);
 652                         for (i = 0 ; i < RX_RING_SIZE; i++)
 653                                 printk("%s %08x %04x %04x", i & 0x3 ? "" : "\n ",
 654                                            lp->rx_ring[i].base, -lp->rx_ring[i].buf_length,
 655                                            lp->rx_ring[i].msg_length);
 656                         for (i = 0 ; i < TX_RING_SIZE; i++)
 657                                 printk("%s %08x %04x %04x", i & 0x3 ? "" : "\n ",
 658                                            lp->tx_ring[i].base, -lp->tx_ring[i].length,
 659                                            lp->tx_ring[i].misc);
 660                         printk("\n");
 661                 }
 662 #endif
 663                 lance_init_ring(dev);
 664                 outw(0x0043, ioaddr+LANCE_DATA);
 665 
 666                 dev->tbusy=0;
 667                 dev->trans_start = jiffies;
 668 
 669                 return 0;
 670         }
 671 
 672         if (skb == NULL) {
 673                 dev_tint(dev);
 674                 return 0;
 675         }
 676 
 677         if (skb->len <= 0)
 678                 return 0;
 679 
 680         if (lance_debug > 3) {
 681                 outw(0x0000, ioaddr+LANCE_ADDR);
 682                 printk("%s: lance_start_xmit() called, csr0 %4.4x.\n", dev->name,
 683                            inw(ioaddr+LANCE_DATA));
 684                 outw(0x0000, ioaddr+LANCE_DATA);
 685         }
 686 
 687         /* Block a timer-based transmit from overlapping.  This could better be
 688            done with atomic_swap(1, dev->tbusy), but set_bit() works as well. */
 689         if (set_bit(0, (void*)&dev->tbusy) != 0) {
 690                 printk("%s: Transmitter access conflict.\n", dev->name);
 691                 return 1;
 692         }
 693 
 694         if (set_bit(0, (void*)&lp->lock) != 0) {
 695                 if (lance_debug > 0)
 696                         printk("%s: tx queue lock!.\n", dev->name);
 697                 /* don't clear dev->tbusy flag. */
 698                 return 1;
 699         }
 700 
 701         /* Fill in a Tx ring entry */
 702 
 703         /* Mask to ring buffer boundary. */
 704         entry = lp->cur_tx & TX_RING_MOD_MASK;
 705 
 706         /* Caution: the write order is important here, set the base address
 707            with the "ownership" bits last. */
 708 
 709         /* The old LANCE chips doesn't automatically pad buffers to min. size. */
 710         if (lp->chip_version == OLD_LANCE) {
 711                 lp->tx_ring[entry].length =
 712                         -(ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN);
 713         } else
 714                 lp->tx_ring[entry].length = -skb->len;
 715 
 716         lp->tx_ring[entry].misc = 0x0000;
 717 
 718         /* If any part of this buffer is >16M we must copy it to a low-memory
 719            buffer. */
 720         if ((int)(skb->data) + skb->len > 0x01000000) {
 721                 if (lance_debug > 5)
 722                         printk("%s: bouncing a high-memory packet (%#x).\n",
 723                                    dev->name, (int)(skb->data));
 724                 memcpy(&lp->tx_bounce_buffs[entry], skb->data, skb->len);
 725                 lp->tx_ring[entry].base =
 726                         (int)(lp->tx_bounce_buffs + entry) | 0x83000000;
 727                 dev_kfree_skb (skb, FREE_WRITE);
 728         } else {
 729                 lp->tx_skbuff[entry] = skb;
 730                 lp->tx_ring[entry].base = (int)(skb->data) | 0x83000000;
 731         }
 732         lp->cur_tx++;
 733 
 734         /* Trigger an immediate send poll. */
 735         outw(0x0000, ioaddr+LANCE_ADDR);
 736         outw(0x0048, ioaddr+LANCE_DATA);
 737 
 738         dev->trans_start = jiffies;
 739 
 740         cli();
 741         lp->lock = 0;
 742         if (lp->tx_ring[(entry+1) & TX_RING_MOD_MASK].base == 0)
 743                 dev->tbusy=0;
 744         else
 745                 lp->tx_full = 1;
 746         sti();
 747 
 748         return 0;
 749 }
 750 
 751 /* The LANCE interrupt handler. */
 752 static void
 753 lance_interrupt(int reg_ptr)
     /* [previous][next][first][last][top][bottom][index][help] */
 754 {
 755         int irq = -(((struct pt_regs *)reg_ptr)->orig_eax+2);
 756         struct device *dev = (struct device *)(irq2dev_map[irq]);
 757         struct lance_private *lp;
 758         int csr0, ioaddr, boguscnt=10;
 759 
 760         if (dev == NULL) {
 761                 printk ("lance_interrupt(): irq %d for unknown device.\n", irq);
 762                 return;
 763         }
 764 
 765         ioaddr = dev->base_addr;
 766         lp = (struct lance_private *)dev->priv;
 767         if (dev->interrupt)
 768                 printk("%s: Re-entering the interrupt handler.\n", dev->name);
 769 
 770         dev->interrupt = 1;
 771 
 772         outw(0x00, dev->base_addr + LANCE_ADDR);
 773         while ((csr0 = inw(dev->base_addr + LANCE_DATA)) & 0x8600
 774                    && --boguscnt >= 0) {
 775                 /* Acknowledge all of the current interrupt sources ASAP. */
 776                 outw(csr0 & ~0x004f, dev->base_addr + LANCE_DATA);
 777 
 778                 if (lance_debug > 5)
 779                         printk("%s: interrupt  csr0=%#2.2x new csr=%#2.2x.\n",
 780                                    dev->name, csr0, inw(dev->base_addr + LANCE_DATA));
 781 
 782                 if (csr0 & 0x0400)                      /* Rx interrupt */
 783                         lance_rx(dev);
 784 
 785                 if (csr0 & 0x0200) {            /* Tx-done interrupt */
 786                         int dirty_tx = lp->dirty_tx;
 787 
 788                         while (dirty_tx < lp->cur_tx) {
 789                                 int entry = dirty_tx & TX_RING_MOD_MASK;
 790                                 int status = lp->tx_ring[entry].base;
 791                         
 792                                 if (status < 0)
 793                                         break;                  /* It still hasn't been Txed */
 794 
 795                                 lp->tx_ring[entry].base = 0;
 796 
 797                                 if (status & 0x40000000) {
 798                                         /* There was an major error, log it. */
 799                                         int err_status = lp->tx_ring[entry].misc;
 800                                         lp->stats.tx_errors++;
 801                                         if (err_status & 0x0400) lp->stats.tx_aborted_errors++;
 802                                         if (err_status & 0x0800) lp->stats.tx_carrier_errors++;
 803                                         if (err_status & 0x1000) lp->stats.tx_window_errors++;
 804                                         if (err_status & 0x4000) {
 805                                                 /* Ackk!  On FIFO errors the Tx unit is turned off! */
 806                                                 lp->stats.tx_fifo_errors++;
 807                                                 /* Remove this verbosity later! */
 808                                                 printk("%s: Tx FIFO error! Status %4.4x.\n",
 809                                                            dev->name, csr0);
 810                                                 /* Restart the chip. */
 811                                                 outw(0x0002, dev->base_addr + LANCE_DATA);
 812                                         }
 813                                 } else {
 814                                         if (status & 0x18000000)
 815                                                 lp->stats.collisions++;
 816                                         lp->stats.tx_packets++;
 817                                 }
 818 
 819                                 /* We must free the original skb if it's not a data-only copy
 820                                    in the bounce buffer. */
 821                                 if (lp->tx_skbuff[entry]) {
 822                                         dev_kfree_skb(lp->tx_skbuff[entry],FREE_WRITE);
 823                                         lp->tx_skbuff[entry] = 0;
 824                                 }
 825                                 dirty_tx++;
 826                         }
 827 
 828 #ifndef final_version
 829                         if (lp->cur_tx - dirty_tx >= TX_RING_SIZE) {
 830                                 printk("out-of-sync dirty pointer, %d vs. %d, full=%d.\n",
 831                                            dirty_tx, lp->cur_tx, lp->tx_full);
 832                                 dirty_tx += TX_RING_SIZE;
 833                         }
 834 #endif
 835 
 836                         if (lp->tx_full && dev->tbusy
 837                                 && dirty_tx > lp->cur_tx - TX_RING_SIZE + 2) {
 838                                 /* The ring is no longer full, clear tbusy. */
 839                                 lp->tx_full = 0;
 840                                 dev->tbusy = 0;
 841                                 mark_bh(NET_BH);
 842                         }
 843 
 844                         lp->dirty_tx = dirty_tx;
 845                 }
 846 
 847                 /* Log misc errors. */
 848                 if (csr0 & 0x4000) lp->stats.tx_errors++; /* Tx babble. */
 849                 if (csr0 & 0x1000) lp->stats.rx_errors++; /* Missed a Rx frame. */
 850                 if (csr0 & 0x0800) {
 851                         printk("%s: Bus master arbitration failure, status %4.4x.\n",
 852                                    dev->name, csr0);
 853                         /* Restart the chip. */
 854                         outw(0x0002, dev->base_addr + LANCE_DATA);
 855                 }
 856         }
 857 
 858     /* Clear any other interrupt, and set interrupt enable. */
 859     outw(0x0000, dev->base_addr + LANCE_ADDR);
 860     outw(0x7940, dev->base_addr + LANCE_DATA);
 861 
 862         if (lance_debug > 4)
 863                 printk("%s: exiting interrupt, csr%d=%#4.4x.\n",
 864                            dev->name, inw(ioaddr + LANCE_ADDR),
 865                            inw(dev->base_addr + LANCE_DATA));
 866 
 867         dev->interrupt = 0;
 868         return;
 869 }
 870 
 871 static int
 872 lance_rx(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 873 {
 874         struct lance_private *lp = (struct lance_private *)dev->priv;
 875         int entry = lp->cur_rx & RX_RING_MOD_MASK;
 876         int i;
 877                 
 878         /* If we own the next entry, it's a new packet. Send it up. */
 879         while (lp->rx_ring[entry].base >= 0) {
 880                 int status = lp->rx_ring[entry].base >> 24;
 881 
 882                 if (status != 0x03) {                   /* There was an error. */
 883                         /* There is a tricky error noted by John Murphy,
 884                            <murf@perftech.com> to Russ Nelson: Even with full-sized
 885                            buffers it's possible for a jabber packet to use two
 886                            buffers, with only the last correctly noting the error. */
 887                         if (status & 0x01)      /* Only count a general error at the */
 888                                 lp->stats.rx_errors++; /* end of a packet.*/
 889                         if (status & 0x20) lp->stats.rx_frame_errors++;
 890                         if (status & 0x10) lp->stats.rx_over_errors++;
 891                         if (status & 0x08) lp->stats.rx_crc_errors++;
 892                         if (status & 0x04) lp->stats.rx_fifo_errors++;
 893                         lp->rx_ring[entry].base &= 0x03ffffff;
 894                 } else {
 895                         /* Malloc up new buffer, compatible with net-2e. */
 896                         short pkt_len = lp->rx_ring[entry].msg_length;
 897                         struct sk_buff *skb;
 898 
 899                         skb = alloc_skb(pkt_len, GFP_ATOMIC);
 900                         if (skb == NULL) {
 901                                 printk("%s: Memory squeeze, deferring packet.\n", dev->name);
 902                                 for (i=0; i < RX_RING_SIZE; i++)
 903                                   if (lp->rx_ring[(entry+i) & RX_RING_MOD_MASK].base < 0)
 904                                         break;
 905 
 906                                 if (i > RX_RING_SIZE -2) {
 907                                   lp->stats.rx_dropped++;
 908                                   lp->rx_ring[entry].base |= 0x80000000;
 909                                   lp->cur_rx++;
 910                                 }
 911                                 break;
 912                         }
 913                         skb->len = pkt_len;
 914                         skb->dev = dev;
 915                         memcpy(skb->data,
 916                                    (unsigned char *)(lp->rx_ring[entry].base & 0x00ffffff),
 917                                    pkt_len);
 918                         netif_rx(skb);
 919                         lp->stats.rx_packets++;
 920                 }
 921 
 922                 /* The docs say that the buffer length isn't touched, but Andrew Boyd
 923                    of QNX reports that some revs of the 79C965 clear it. */
 924                 lp->rx_ring[entry].buf_length = -PKT_BUF_SZ;
 925                 lp->rx_ring[entry].base |= 0x80000000;
 926                 entry = (++lp->cur_rx) & RX_RING_MOD_MASK;
 927         }
 928 
 929         /* We should check that at least two ring entries are free.      If not,
 930            we should free one and mark stats->rx_dropped++. */
 931 
 932         return 0;
 933 }
 934 
 935 static int
 936 lance_close(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 937 {
 938         int ioaddr = dev->base_addr;
 939         struct lance_private *lp = (struct lance_private *)dev->priv;
 940 
 941         dev->start = 0;
 942         dev->tbusy = 1;
 943 
 944         if (lp->chip_version != OLD_LANCE) {
 945                 outw(112, ioaddr+LANCE_ADDR);
 946                 lp->stats.rx_missed_errors = inw(ioaddr+LANCE_DATA);
 947         }
 948         outw(0, ioaddr+LANCE_ADDR);
 949 
 950         if (lance_debug > 1)
 951                 printk("%s: Shutting down ethercard, status was %2.2x.\n",
 952                            dev->name, inw(ioaddr+LANCE_DATA));
 953 
 954         /* We stop the LANCE here -- it occasionally polls
 955            memory if we don't. */
 956         outw(0x0004, ioaddr+LANCE_DATA);
 957 
 958         if (dev->dma != 4)
 959                 disable_dma(dev->dma);
 960 
 961         free_irq(dev->irq);
 962 
 963         irq2dev_map[dev->irq] = 0;
 964 
 965         return 0;
 966 }
 967 
 968 static struct enet_statistics *
 969 lance_get_stats(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 970 {
 971         struct lance_private *lp = (struct lance_private *)dev->priv;
 972         short ioaddr = dev->base_addr;
 973         short saved_addr;
 974 
 975         if (lp->chip_version != OLD_LANCE) {
 976                 cli();
 977                 saved_addr = inw(ioaddr+LANCE_ADDR);
 978                 outw(112, ioaddr+LANCE_ADDR);
 979                 lp->stats.rx_missed_errors = inw(ioaddr+LANCE_DATA);
 980                 outw(saved_addr, ioaddr+LANCE_ADDR);
 981                 sti();
 982         }
 983 
 984         return &lp->stats;
 985 }
 986 
 987 /* Set or clear the multicast filter for this adaptor.
 988    num_addrs == -1              Promiscuous mode, receive all packets
 989    num_addrs == 0               Normal mode, clear multicast list
 990    num_addrs > 0                Multicast mode, receive normal and MC packets, and do
 991                                                 best-effort filtering.
 992  */
 993 static void
 994 set_multicast_list(struct device *dev, int num_addrs, void *addrs)
     /* [previous][next][first][last][top][bottom][index][help] */
 995 {
 996         short ioaddr = dev->base_addr;
 997 
 998         /* We take the simple way out and always enable promiscuous mode. */
 999         outw(0, ioaddr+LANCE_ADDR);
1000         outw(0x0004, ioaddr+LANCE_DATA); /* Temporarily stop the lance.  */
1001 
1002         outw(15, ioaddr+LANCE_ADDR);
1003         if (num_addrs >= 0) {
1004                 short multicast_table[4];
1005                 int i;
1006                 /* We don't use the multicast table, but rely on upper-layer filtering. */
1007                 memset(multicast_table, (num_addrs == 0) ? 0 : -1, sizeof(multicast_table));
1008                 for (i = 0; i < 4; i++) {
1009                         outw(8 + i, ioaddr+LANCE_ADDR);
1010                         outw(multicast_table[i], ioaddr+LANCE_DATA);
1011                 }
1012                 outw(0x0000, ioaddr+LANCE_DATA); /* Unset promiscuous mode */
1013         } else {
1014                 /* Log any net taps. */
1015                 printk("%s: Promiscuous mode enabled.\n", dev->name);
1016                 outw(0x8000, ioaddr+LANCE_DATA); /* Set promiscuous mode */
1017         }
1018 
1019         outw(0, ioaddr+LANCE_ADDR);
1020         outw(0x0142, ioaddr+LANCE_DATA); /* Resume normal operation. */
1021 }
1022 
1023 
1024 /*
1025  * Local variables:
1026  *  compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -m486 -c lance.c"
1027  *  c-indent-level: 4
1028  *  tab-width: 4
1029  * End:
1030  */

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