LXR linux/drivers/net/ethernet/amd/sun3lance.c

   1/* sun3lance.c: Ethernet driver for SUN3 Lance chip */
   2/*
   3
   4  Sun3 Lance ethernet driver, by Sam Creasey (sammy@users.qual.net).
   5  This driver is a part of the linux kernel, and is thus distributed
   6  under the GNU General Public License.
   7
   8  The values used in LANCE_OBIO and LANCE_IRQ seem to be empirically
   9  true for the correct IRQ and address of the lance registers.  They
  10  have not been widely tested, however.  What we probably need is a
  11  "proper" way to search for a device in the sun3's prom, but, alas,
  12  linux has no such thing.
  13
  14  This driver is largely based on atarilance.c, by Roman Hodek.  Other
  15  sources of inspiration were the NetBSD sun3 am7990 driver, and the
  16  linux sparc lance driver (sunlance.c).
  17
  18  There are more assumptions made throughout this driver, it almost
  19  certainly still needs work, but it does work at least for RARP/BOOTP and
  20  mounting the root NFS filesystem.
  21
  22*/
  23
  24static const char version[] =
  25"sun3lance.c: v1.2 1/12/2001  Sam Creasey (sammy@sammy.net)\n";
  26
  27#include <linux/module.h>
  28#include <linux/stddef.h>
  29#include <linux/kernel.h>
  30#include <linux/string.h>
  31#include <linux/errno.h>
  32#include <linux/interrupt.h>
  33#include <linux/init.h>
  34#include <linux/ioport.h>
  35#include <linux/delay.h>
  36#include <linux/netdevice.h>
  37#include <linux/etherdevice.h>
  38#include <linux/skbuff.h>
  39#include <linux/bitops.h>
  40#include <linux/pgtable.h>
  41
  42#include <asm/cacheflush.h>
  43#include <asm/setup.h>
  44#include <asm/irq.h>
  45#include <asm/io.h>
  46#include <asm/dvma.h>
  47#include <asm/idprom.h>
  48#include <asm/machines.h>
  49
  50#ifdef CONFIG_SUN3
  51#include <asm/sun3mmu.h>
  52#else
  53#include <asm/sun3xprom.h>
  54#endif
  55
  56/* sun3/60 addr/irq for the lance chip.  If your sun is different,
  57   change this. */
  58#define LANCE_OBIO 0x120000
  59#define LANCE_IRQ IRQ_AUTO_3
  60
  61/* Debug level:
  62 *  0 = silent, print only serious errors
  63 *  1 = normal, print error messages
  64 *  2 = debug, print debug infos
  65 *  3 = debug, print even more debug infos (packet data)
  66 */
  67
  68#define LANCE_DEBUG     0
  69
  70#ifdef LANCE_DEBUG
  71static int lance_debug = LANCE_DEBUG;
  72#else
  73static int lance_debug = 1;
  74#endif
  75module_param(lance_debug, int, 0);
  76MODULE_PARM_DESC(lance_debug, "SUN3 Lance debug level (0-3)");
  77MODULE_LICENSE("GPL");
  78
  79#define DPRINTK(n,a) \
  80        do {  \
  81                if (lance_debug >= n)  \
  82                        printk a; \
  83        } while( 0 )
  84
  85
  86/* we're only using 32k of memory, so we use 4 TX
  87   buffers and 16 RX buffers.  These values are expressed as log2. */
  88
  89#define TX_LOG_RING_SIZE                        3
  90#define RX_LOG_RING_SIZE                        5
  91
  92/* These are the derived values */
  93
  94#define TX_RING_SIZE                    (1 << TX_LOG_RING_SIZE)
  95#define TX_RING_LEN_BITS                (TX_LOG_RING_SIZE << 5)
  96#define TX_RING_MOD_MASK                (TX_RING_SIZE - 1)
  97
  98#define RX_RING_SIZE                    (1 << RX_LOG_RING_SIZE)
  99#define RX_RING_LEN_BITS                (RX_LOG_RING_SIZE << 5)
 100#define RX_RING_MOD_MASK                (RX_RING_SIZE - 1)
 101
 102/* Definitions for packet buffer access: */
 103#define PKT_BUF_SZ              1544
 104
 105/* Get the address of a packet buffer corresponding to a given buffer head */
 106#define PKTBUF_ADDR(head)       (void *)((unsigned long)(MEM) | (head)->base)
 107
 108
 109/* The LANCE Rx and Tx ring descriptors. */
 110struct lance_rx_head {
 111        unsigned short  base;           /* Low word of base addr */
 112        volatile unsigned char  flag;
 113        unsigned char  base_hi; /* High word of base addr (unused) */
 114        short buf_length;       /* This length is 2s complement! */
 115        volatile short msg_length;      /* This length is "normal". */
 116};
 117
 118struct lance_tx_head {
 119        unsigned short base;            /* Low word of base addr */
 120        volatile unsigned char  flag;
 121        unsigned char base_hi;  /* High word of base addr (unused) */
 122        short length;           /* Length is 2s complement! */
 123        volatile short misc;
 124};
 125
 126/* The LANCE initialization block, described in databook. */
 127struct lance_init_block {
 128        unsigned short  mode;           /* Pre-set mode */
 129        unsigned char   hwaddr[6];      /* Physical ethernet address */
 130        unsigned int    filter[2];      /* Multicast filter (unused). */
 131        /* Receive and transmit ring base, along with length bits. */
 132        unsigned short rdra;
 133        unsigned short rlen;
 134        unsigned short tdra;
 135        unsigned short tlen;
 136        unsigned short pad[4]; /* is thie needed? */
 137};
 138
 139/* The whole layout of the Lance shared memory */
 140struct lance_memory {
 141        struct lance_init_block init;
 142        struct lance_tx_head    tx_head[TX_RING_SIZE];
 143        struct lance_rx_head    rx_head[RX_RING_SIZE];
 144        char   rx_data[RX_RING_SIZE][PKT_BUF_SZ];
 145        char   tx_data[TX_RING_SIZE][PKT_BUF_SZ];
 146};
 147
 148/* The driver's private device structure */
 149
 150struct lance_private {
 151        volatile unsigned short *iobase;
 152        struct lance_memory     *mem;
 153        int new_rx, new_tx;     /* The next free ring entry */
 154        int old_tx, old_rx;     /* ring entry to be processed */
 155/* These two must be longs for set_bit() */
 156        long        tx_full;
 157        long        lock;
 158};
 159
 160/* I/O register access macros */
 161
 162#define MEM     lp->mem
 163#define DREG    lp->iobase[0]
 164#define AREG    lp->iobase[1]
 165#define REGA(a) (*( AREG = (a), &DREG ))
 166
 167/* Definitions for the Lance */
 168
 169/* tx_head flags */
 170#define TMD1_ENP                0x01    /* end of packet */
 171#define TMD1_STP                0x02    /* start of packet */
 172#define TMD1_DEF                0x04    /* deferred */
 173#define TMD1_ONE                0x08    /* one retry needed */
 174#define TMD1_MORE               0x10    /* more than one retry needed */
 175#define TMD1_ERR                0x40    /* error summary */
 176#define TMD1_OWN                0x80    /* ownership (set: chip owns) */
 177
 178#define TMD1_OWN_CHIP   TMD1_OWN
 179#define TMD1_OWN_HOST   0
 180
 181/* tx_head misc field */
 182#define TMD3_TDR                0x03FF  /* Time Domain Reflectometry counter */
 183#define TMD3_RTRY               0x0400  /* failed after 16 retries */
 184#define TMD3_LCAR               0x0800  /* carrier lost */
 185#define TMD3_LCOL               0x1000  /* late collision */
 186#define TMD3_UFLO               0x4000  /* underflow (late memory) */
 187#define TMD3_BUFF               0x8000  /* buffering error (no ENP) */
 188
 189/* rx_head flags */
 190#define RMD1_ENP                0x01    /* end of packet */
 191#define RMD1_STP                0x02    /* start of packet */
 192#define RMD1_BUFF               0x04    /* buffer error */
 193#define RMD1_CRC                0x08    /* CRC error */
 194#define RMD1_OFLO               0x10    /* overflow */
 195#define RMD1_FRAM               0x20    /* framing error */
 196#define RMD1_ERR                0x40    /* error summary */
 197#define RMD1_OWN                0x80    /* ownership (set: ship owns) */
 198
 199#define RMD1_OWN_CHIP   RMD1_OWN
 200#define RMD1_OWN_HOST   0
 201
 202/* register names */
 203#define CSR0    0               /* mode/status */
 204#define CSR1    1               /* init block addr (low) */
 205#define CSR2    2               /* init block addr (high) */
 206#define CSR3    3               /* misc */
 207#define CSR8    8               /* address filter */
 208#define CSR15   15              /* promiscuous mode */
 209
 210/* CSR0 */
 211/* (R=readable, W=writeable, S=set on write, C=clear on write) */
 212#define CSR0_INIT       0x0001          /* initialize (RS) */
 213#define CSR0_STRT       0x0002          /* start (RS) */
 214#define CSR0_STOP       0x0004          /* stop (RS) */
 215#define CSR0_TDMD       0x0008          /* transmit demand (RS) */
 216#define CSR0_TXON       0x0010          /* transmitter on (R) */
 217#define CSR0_RXON       0x0020          /* receiver on (R) */
 218#define CSR0_INEA       0x0040          /* interrupt enable (RW) */
 219#define CSR0_INTR       0x0080          /* interrupt active (R) */
 220#define CSR0_IDON       0x0100          /* initialization done (RC) */
 221#define CSR0_TINT       0x0200          /* transmitter interrupt (RC) */
 222#define CSR0_RINT       0x0400          /* receiver interrupt (RC) */
 223#define CSR0_MERR       0x0800          /* memory error (RC) */
 224#define CSR0_MISS       0x1000          /* missed frame (RC) */
 225#define CSR0_CERR       0x2000          /* carrier error (no heartbeat :-) (RC) */
 226#define CSR0_BABL       0x4000          /* babble: tx-ed too many bits (RC) */
 227#define CSR0_ERR        0x8000          /* error (RC) */
 228
 229/* CSR3 */
 230#define CSR3_BCON       0x0001          /* byte control */
 231#define CSR3_ACON       0x0002          /* ALE control */
 232#define CSR3_BSWP       0x0004          /* byte swap (1=big endian) */
 233
 234/***************************** Prototypes *****************************/
 235
 236static int lance_probe( struct net_device *dev);
 237static int lance_open( struct net_device *dev );
 238static void lance_init_ring( struct net_device *dev );
 239static netdev_tx_t lance_start_xmit(struct sk_buff *skb,
 240                                    struct net_device *dev);
 241static irqreturn_t lance_interrupt( int irq, void *dev_id);
 242static int lance_rx( struct net_device *dev );
 243static int lance_close( struct net_device *dev );
 244static void set_multicast_list( struct net_device *dev );
 245
 246/************************* End of Prototypes **************************/
 247
 248struct net_device * __init sun3lance_probe(int unit)
 249{
 250        struct net_device *dev;
 251        static int found;
 252        int err = -ENODEV;
 253
 254        if (!MACH_IS_SUN3 && !MACH_IS_SUN3X)
 255                return ERR_PTR(-ENODEV);
 256
 257        /* check that this machine has an onboard lance */
 258        switch(idprom->id_machtype) {
 259        case SM_SUN3|SM_3_50:
 260        case SM_SUN3|SM_3_60:
 261        case SM_SUN3X|SM_3_80:
 262                /* these machines have lance */
 263                break;
 264
 265        default:
 266                return ERR_PTR(-ENODEV);
 267        }
 268
 269        if (found)
 270                return ERR_PTR(-ENODEV);
 271
 272        dev = alloc_etherdev(sizeof(struct lance_private));
 273        if (!dev)
 274                return ERR_PTR(-ENOMEM);
 275        if (unit >= 0) {
 276                sprintf(dev->name, "eth%d", unit);
 277                netdev_boot_setup_check(dev);
 278        }
 279
 280        if (!lance_probe(dev))
 281                goto out;
 282
 283        err = register_netdev(dev);
 284        if (err)
 285                goto out1;
 286        found = 1;
 287        return dev;
 288
 289out1:
 290#ifdef CONFIG_SUN3
 291        iounmap((void __iomem *)dev->base_addr);
 292#endif
 293out:
 294        free_netdev(dev);
 295        return ERR_PTR(err);
 296}
 297
 298static const struct net_device_ops lance_netdev_ops = {
 299        .ndo_open               = lance_open,
 300        .ndo_stop               = lance_close,
 301        .ndo_start_xmit         = lance_start_xmit,
 302        .ndo_set_rx_mode        = set_multicast_list,
 303        .ndo_set_mac_address    = NULL,
 304        .ndo_validate_addr      = eth_validate_addr,
 305};
 306
 307static int __init lance_probe( struct net_device *dev)
 308{
 309        unsigned long ioaddr;
 310
 311        struct lance_private    *lp;
 312        int                     i;
 313        static int              did_version;
 314        volatile unsigned short *ioaddr_probe;
 315        unsigned short tmp1, tmp2;
 316
 317#ifdef CONFIG_SUN3
 318        ioaddr = (unsigned long)ioremap(LANCE_OBIO, PAGE_SIZE);
 319        if (!ioaddr)
 320                return 0;
 321#else
 322        ioaddr = SUN3X_LANCE;
 323#endif
 324
 325        /* test to see if there's really a lance here */
 326        /* (CSRO_INIT shouldn't be readable) */
 327
 328        ioaddr_probe = (volatile unsigned short *)ioaddr;
 329        tmp1 = ioaddr_probe[0];
 330        tmp2 = ioaddr_probe[1];
 331
 332        ioaddr_probe[1] = CSR0;
 333        ioaddr_probe[0] = CSR0_INIT | CSR0_STOP;
 334
 335        if(ioaddr_probe[0] != CSR0_STOP) {
 336                ioaddr_probe[0] = tmp1;
 337                ioaddr_probe[1] = tmp2;
 338
 339#ifdef CONFIG_SUN3
 340                iounmap((void __iomem *)ioaddr);
 341#endif
 342                return 0;
 343        }
 344
 345        lp = netdev_priv(dev);
 346
 347        /* XXX - leak? */
 348        MEM = dvma_malloc_align(sizeof(struct lance_memory), 0x10000);
 349        if (MEM == NULL) {
 350#ifdef CONFIG_SUN3
 351                iounmap((void __iomem *)ioaddr);
 352#endif
 353                printk(KERN_WARNING "SUN3 Lance couldn't allocate DVMA memory\n");
 354                return 0;
 355        }
 356
 357        lp->iobase = (volatile unsigned short *)ioaddr;
 358        dev->base_addr = (unsigned long)ioaddr; /* informational only */
 359
 360        REGA(CSR0) = CSR0_STOP;
 361
 362        if (request_irq(LANCE_IRQ, lance_interrupt, 0, "SUN3 Lance", dev) < 0) {
 363#ifdef CONFIG_SUN3
 364                iounmap((void __iomem *)ioaddr);
 365#endif
 366                dvma_free((void *)MEM);
 367                printk(KERN_WARNING "SUN3 Lance unable to allocate IRQ\n");
 368                return 0;
 369        }
 370        dev->irq = (unsigned short)LANCE_IRQ;
 371
 372
 373        printk("%s: SUN3 Lance at io %#lx, mem %#lx, irq %d, hwaddr ",
 374                   dev->name,
 375                   (unsigned long)ioaddr,
 376                   (unsigned long)MEM,
 377                   dev->irq);
 378
 379        /* copy in the ethernet address from the prom */
 380        for(i = 0; i < 6 ; i++)
 381             dev->dev_addr[i] = idprom->id_ethaddr[i];
 382
 383        /* tell the card it's ether address, bytes swapped */
 384        MEM->init.hwaddr[0] = dev->dev_addr[1];
 385        MEM->init.hwaddr[1] = dev->dev_addr[0];
 386        MEM->init.hwaddr[2] = dev->dev_addr[3];
 387        MEM->init.hwaddr[3] = dev->dev_addr[2];
 388        MEM->init.hwaddr[4] = dev->dev_addr[5];
 389        MEM->init.hwaddr[5] = dev->dev_addr[4];
 390
 391        printk("%pM\n", dev->dev_addr);
 392
 393        MEM->init.mode = 0x0000;
 394        MEM->init.filter[0] = 0x00000000;
 395        MEM->init.filter[1] = 0x00000000;
 396        MEM->init.rdra = dvma_vtob(MEM->rx_head);
 397        MEM->init.rlen    = (RX_LOG_RING_SIZE << 13) |
 398                (dvma_vtob(MEM->rx_head) >> 16);
 399        MEM->init.tdra = dvma_vtob(MEM->tx_head);
 400        MEM->init.tlen    = (TX_LOG_RING_SIZE << 13) |
 401                (dvma_vtob(MEM->tx_head) >> 16);
 402
 403        DPRINTK(2, ("initaddr: %08lx rx_ring: %08lx tx_ring: %08lx\n",
 404               dvma_vtob(&(MEM->init)), dvma_vtob(MEM->rx_head),
 405               (dvma_vtob(MEM->tx_head))));
 406
 407        if (did_version++ == 0)
 408                printk( version );
 409
 410        dev->netdev_ops = &lance_netdev_ops;
 411//      KLUDGE -- REMOVE ME
 412        set_bit(__LINK_STATE_PRESENT, &dev->state);
 413
 414
 415        return 1;
 416}
 417
 418static int lance_open( struct net_device *dev )
 419{
 420        struct lance_private *lp = netdev_priv(dev);
 421        int i;
 422
 423        DPRINTK( 2, ( "%s: lance_open()\n", dev->name ));
 424
 425        REGA(CSR0) = CSR0_STOP;
 426
 427        lance_init_ring(dev);
 428
 429        /* From now on, AREG is kept to point to CSR0 */
 430        REGA(CSR0) = CSR0_INIT;
 431
 432        i = 1000000;
 433        while (--i > 0)
 434                if (DREG & CSR0_IDON)
 435                        break;
 436        if (i <= 0 || (DREG & CSR0_ERR)) {
 437                DPRINTK( 2, ( "lance_open(): opening %s failed, i=%d, csr0=%04x\n",
 438                                          dev->name, i, DREG ));
 439                DREG = CSR0_STOP;
 440                return -EIO;
 441        }
 442
 443        DREG = CSR0_IDON | CSR0_STRT | CSR0_INEA;
 444
 445        netif_start_queue(dev);
 446
 447        DPRINTK( 2, ( "%s: LANCE is open, csr0 %04x\n", dev->name, DREG ));
 448
 449        return 0;
 450}
 451
 452
 453/* Initialize the LANCE Rx and Tx rings. */
 454
 455static void lance_init_ring( struct net_device *dev )
 456{
 457        struct lance_private *lp = netdev_priv(dev);
 458        int i;
 459
 460        lp->lock = 0;
 461        lp->tx_full = 0;
 462        lp->new_rx = lp->new_tx = 0;
 463        lp->old_rx = lp->old_tx = 0;
 464
 465        for( i = 0; i < TX_RING_SIZE; i++ ) {
 466                MEM->tx_head[i].base = dvma_vtob(MEM->tx_data[i]);
 467                MEM->tx_head[i].flag = 0;
 468                MEM->tx_head[i].base_hi =
 469                        (dvma_vtob(MEM->tx_data[i])) >>16;
 470                MEM->tx_head[i].length = 0;
 471                MEM->tx_head[i].misc = 0;
 472        }
 473
 474        for( i = 0; i < RX_RING_SIZE; i++ ) {
 475                MEM->rx_head[i].base = dvma_vtob(MEM->rx_data[i]);
 476                MEM->rx_head[i].flag = RMD1_OWN_CHIP;
 477                MEM->rx_head[i].base_hi =
 478                        (dvma_vtob(MEM->rx_data[i])) >> 16;
 479                MEM->rx_head[i].buf_length = -PKT_BUF_SZ | 0xf000;
 480                MEM->rx_head[i].msg_length = 0;
 481        }
 482
 483        /* tell the card it's ether address, bytes swapped */
 484        MEM->init.hwaddr[0] = dev->dev_addr[1];
 485        MEM->init.hwaddr[1] = dev->dev_addr[0];
 486        MEM->init.hwaddr[2] = dev->dev_addr[3];
 487        MEM->init.hwaddr[3] = dev->dev_addr[2];
 488        MEM->init.hwaddr[4] = dev->dev_addr[5];
 489        MEM->init.hwaddr[5] = dev->dev_addr[4];
 490
 491        MEM->init.mode = 0x0000;
 492        MEM->init.filter[0] = 0x00000000;
 493        MEM->init.filter[1] = 0x00000000;
 494        MEM->init.rdra = dvma_vtob(MEM->rx_head);
 495        MEM->init.rlen    = (RX_LOG_RING_SIZE << 13) |
 496                (dvma_vtob(MEM->rx_head) >> 16);
 497        MEM->init.tdra = dvma_vtob(MEM->tx_head);
 498        MEM->init.tlen    = (TX_LOG_RING_SIZE << 13) |
 499                (dvma_vtob(MEM->tx_head) >> 16);
 500
 501
 502        /* tell the lance the address of its init block */
 503        REGA(CSR1) = dvma_vtob(&(MEM->init));
 504        REGA(CSR2) = dvma_vtob(&(MEM->init)) >> 16;
 505
 506#ifdef CONFIG_SUN3X
 507        REGA(CSR3) = CSR3_BSWP | CSR3_ACON | CSR3_BCON;
 508#else
 509        REGA(CSR3) = CSR3_BSWP;
 510#endif
 511
 512}
 513
 514
 515static netdev_tx_t
 516lance_start_xmit(struct sk_buff *skb, struct net_device *dev)
 517{
 518        struct lance_private *lp = netdev_priv(dev);
 519        int entry, len;
 520        struct lance_tx_head *head;
 521        unsigned long flags;
 522
 523        DPRINTK( 1, ( "%s: transmit start.\n",
 524                      dev->name));
 525
 526        /* Transmitter timeout, serious problems. */
 527        if (netif_queue_stopped(dev)) {
 528                int tickssofar = jiffies - dev_trans_start(dev);
 529                if (tickssofar < HZ/5)
 530                        return NETDEV_TX_BUSY;
 531
 532                DPRINTK( 1, ( "%s: transmit timed out, status %04x, resetting.\n",
 533                                          dev->name, DREG ));
 534                DREG = CSR0_STOP;
 535                /*
 536                 * Always set BSWP after a STOP as STOP puts it back into
 537                 * little endian mode.
 538                 */
 539                REGA(CSR3) = CSR3_BSWP;
 540                dev->stats.tx_errors++;
 541
 542                if(lance_debug >= 2) {
 543                        int i;
 544                        printk("Ring data: old_tx %d new_tx %d%s new_rx %d\n",
 545                               lp->old_tx, lp->new_tx,
 546                               lp->tx_full ? " (full)" : "",
 547                               lp->new_rx );
 548                        for( i = 0 ; i < RX_RING_SIZE; i++ )
 549                                printk( "rx #%d: base=%04x blen=%04x mlen=%04x\n",
 550                                        i, MEM->rx_head[i].base,
 551                                        -MEM->rx_head[i].buf_length,
 552                                        MEM->rx_head[i].msg_length);
 553                        for( i = 0 ; i < TX_RING_SIZE; i++ )
 554                                printk("tx #%d: base=%04x len=%04x misc=%04x\n",
 555                                       i, MEM->tx_head[i].base,
 556                                       -MEM->tx_head[i].length,
 557                                       MEM->tx_head[i].misc );
 558                }
 559
 560                lance_init_ring(dev);
 561                REGA( CSR0 ) = CSR0_INEA | CSR0_INIT | CSR0_STRT;
 562
 563                netif_start_queue(dev);
 564
 565                return NETDEV_TX_OK;
 566        }
 567
 568
 569        /* Block a timer-based transmit from overlapping.  This could better be
 570           done with atomic_swap(1, dev->tbusy), but set_bit() works as well. */
 571
 572        /* Block a timer-based transmit from overlapping with us by
 573           stopping the queue for a bit... */
 574
 575        netif_stop_queue(dev);
 576
 577        if (test_and_set_bit( 0, (void*)&lp->lock ) != 0) {
 578                printk( "%s: tx queue lock!.\n", dev->name);
 579                /* don't clear dev->tbusy flag. */
 580                return NETDEV_TX_BUSY;
 581        }
 582
 583        AREG = CSR0;
 584        DPRINTK( 2, ( "%s: lance_start_xmit() called, csr0 %4.4x.\n",
 585                                  dev->name, DREG ));
 586
 587#ifdef CONFIG_SUN3X
 588        /* this weirdness doesn't appear on sun3... */
 589        if(!(DREG & CSR0_INIT)) {
 590                DPRINTK( 1, ("INIT not set, reinitializing...\n"));
 591                REGA( CSR0 ) = CSR0_STOP;
 592                lance_init_ring(dev);
 593                REGA( CSR0 ) = CSR0_INIT | CSR0_STRT;
 594        }
 595#endif
 596
 597        /* Fill in a Tx ring entry */
 598#if 0
 599        if (lance_debug >= 2) {
 600                printk( "%s: TX pkt %d type 0x%04x"
 601                        " from %s to %s"
 602                        " data at 0x%08x len %d\n",
 603                        dev->name, lp->new_tx, ((u_short *)skb->data)[6],
 604                        DEV_ADDR(&skb->data[6]), DEV_ADDR(skb->data),
 605                        (int)skb->data, (int)skb->len );
 606        }
 607#endif
 608        /* We're not prepared for the int until the last flags are set/reset.
 609         * And the int may happen already after setting the OWN_CHIP... */
 610        local_irq_save(flags);
 611
 612        /* Mask to ring buffer boundary. */
 613        entry = lp->new_tx;
 614        head  = &(MEM->tx_head[entry]);
 615
 616        /* Caution: the write order is important here, set the "ownership" bits
 617         * last.
 618         */
 619
 620        /* the sun3's lance needs it's buffer padded to the minimum
 621           size */
 622        len = (ETH_ZLEN < skb->len) ? skb->len : ETH_ZLEN;
 623
 624//      head->length = -len;
 625        head->length = (-len) | 0xf000;
 626        head->misc = 0;
 627
 628        skb_copy_from_linear_data(skb, PKTBUF_ADDR(head), skb->len);
 629        if (len != skb->len)
 630                memset(PKTBUF_ADDR(head) + skb->len, 0, len-skb->len);
 631
 632        head->flag = TMD1_OWN_CHIP | TMD1_ENP | TMD1_STP;
 633        lp->new_tx = (lp->new_tx + 1) & TX_RING_MOD_MASK;
 634        dev->stats.tx_bytes += skb->len;
 635
 636        /* Trigger an immediate send poll. */
 637        REGA(CSR0) = CSR0_INEA | CSR0_TDMD | CSR0_STRT;
 638        AREG = CSR0;
 639        DPRINTK( 2, ( "%s: lance_start_xmit() exiting, csr0 %4.4x.\n",
 640                                  dev->name, DREG ));
 641        dev_kfree_skb(skb);
 642
 643        lp->lock = 0;
 644        if ((MEM->tx_head[(entry+1) & TX_RING_MOD_MASK].flag & TMD1_OWN) ==
 645            TMD1_OWN_HOST)
 646                netif_start_queue(dev);
 647
 648        local_irq_restore(flags);
 649
 650        return NETDEV_TX_OK;
 651}
 652
 653/* The LANCE interrupt handler. */
 654
 655static irqreturn_t lance_interrupt( int irq, void *dev_id)
 656{
 657        struct net_device *dev = dev_id;
 658        struct lance_private *lp = netdev_priv(dev);
 659        int csr0;
 660
 661 still_more:
 662        flush_cache_all();
 663
 664        AREG = CSR0;
 665        csr0 = DREG;
 666
 667        /* ack interrupts */
 668        DREG = csr0 & (CSR0_TINT | CSR0_RINT | CSR0_IDON);
 669
 670        /* clear errors */
 671        if(csr0 & CSR0_ERR)
 672                DREG = CSR0_BABL | CSR0_MERR | CSR0_CERR | CSR0_MISS;
 673
 674
 675        DPRINTK( 2, ( "%s: interrupt  csr0=%04x new csr=%04x.\n",
 676                      dev->name, csr0, DREG ));
 677
 678        if (csr0 & CSR0_TINT) {                 /* Tx-done interrupt */
 679                int old_tx = lp->old_tx;
 680
 681//              if(lance_debug >= 3) {
 682//                      int i;
 683//
 684//                      printk("%s: tx int\n", dev->name);
 685//
 686//                      for(i = 0; i < TX_RING_SIZE; i++)
 687//                              printk("ring %d flag=%04x\n", i,
 688//                                     MEM->tx_head[i].flag);
 689//              }
 690
 691                while( old_tx != lp->new_tx) {
 692                        struct lance_tx_head *head = &(MEM->tx_head[old_tx]);
 693
 694                        DPRINTK(3, ("on tx_ring %d\n", old_tx));
 695
 696                        if (head->flag & TMD1_OWN_CHIP)
 697                                break; /* It still hasn't been Txed */
 698
 699                        if (head->flag & TMD1_ERR) {
 700                                int status = head->misc;
 701                                dev->stats.tx_errors++;
 702                                if (status & TMD3_RTRY) dev->stats.tx_aborted_errors++;
 703                                if (status & TMD3_LCAR) dev->stats.tx_carrier_errors++;
 704                                if (status & TMD3_LCOL) dev->stats.tx_window_errors++;
 705                                if (status & (TMD3_UFLO | TMD3_BUFF)) {
 706                                        dev->stats.tx_fifo_errors++;
 707                                        printk("%s: Tx FIFO error\n",
 708                                               dev->name);
 709                                        REGA(CSR0) = CSR0_STOP;
 710                                        REGA(CSR3) = CSR3_BSWP;
 711                                        lance_init_ring(dev);
 712                                        REGA(CSR0) = CSR0_STRT | CSR0_INEA;
 713                                        return IRQ_HANDLED;
 714                                }
 715                        } else if(head->flag & (TMD1_ENP | TMD1_STP)) {
 716
 717                                head->flag &= ~(TMD1_ENP | TMD1_STP);
 718                                if(head->flag & (TMD1_ONE | TMD1_MORE))
 719                                        dev->stats.collisions++;
 720
 721                                dev->stats.tx_packets++;
 722                                DPRINTK(3, ("cleared tx ring %d\n", old_tx));
 723                        }
 724                        old_tx = (old_tx +1) & TX_RING_MOD_MASK;
 725                }
 726
 727                lp->old_tx = old_tx;
 728        }
 729
 730
 731        if (netif_queue_stopped(dev)) {
 732                /* The ring is no longer full, clear tbusy. */
 733                netif_start_queue(dev);
 734                netif_wake_queue(dev);
 735        }
 736
 737        if (csr0 & CSR0_RINT)                   /* Rx interrupt */
 738                lance_rx( dev );
 739
 740        /* Log misc errors. */
 741        if (csr0 & CSR0_BABL) dev->stats.tx_errors++; /* Tx babble. */
 742        if (csr0 & CSR0_MISS) dev->stats.rx_errors++; /* Missed a Rx frame. */
 743        if (csr0 & CSR0_MERR) {
 744                DPRINTK( 1, ( "%s: Bus master arbitration failure (?!?), "
 745                              "status %04x.\n", dev->name, csr0 ));
 746                /* Restart the chip. */
 747                REGA(CSR0) = CSR0_STOP;
 748                REGA(CSR3) = CSR3_BSWP;
 749                lance_init_ring(dev);
 750                REGA(CSR0) = CSR0_STRT | CSR0_INEA;
 751        }
 752
 753
 754    /* Clear any other interrupt, and set interrupt enable. */
 755//      DREG = CSR0_BABL | CSR0_CERR | CSR0_MISS | CSR0_MERR |
 756//                 CSR0_IDON | CSR0_INEA;
 757
 758        REGA(CSR0) = CSR0_INEA;
 759
 760        if(DREG & (CSR0_RINT | CSR0_TINT)) {
 761             DPRINTK(2, ("restarting interrupt, csr0=%#04x\n", DREG));
 762             goto still_more;
 763        }
 764
 765        DPRINTK( 2, ( "%s: exiting interrupt, csr0=%#04x.\n",
 766                                  dev->name, DREG ));
 767        return IRQ_HANDLED;
 768}
 769
 770/* get packet, toss into skbuff */
 771static int lance_rx( struct net_device *dev )
 772{
 773        struct lance_private *lp = netdev_priv(dev);
 774        int entry = lp->new_rx;
 775
 776        /* If we own the next entry, it's a new packet. Send it up. */
 777        while( (MEM->rx_head[entry].flag & RMD1_OWN) == RMD1_OWN_HOST ) {
 778                struct lance_rx_head *head = &(MEM->rx_head[entry]);
 779                int status = head->flag;
 780
 781                if (status != (RMD1_ENP|RMD1_STP)) {  /* There was an error. */
 782                        /* There is a tricky error noted by John Murphy,
 783                           <murf@perftech.com> to Russ Nelson: Even with
 784                           full-sized buffers it's possible for a jabber packet to use two
 785                           buffers, with only the last correctly noting the error. */
 786                        if (status & RMD1_ENP)  /* Only count a general error at the */
 787                                dev->stats.rx_errors++; /* end of a packet.*/
 788                        if (status & RMD1_FRAM) dev->stats.rx_frame_errors++;
 789                        if (status & RMD1_OFLO) dev->stats.rx_over_errors++;
 790                        if (status & RMD1_CRC) dev->stats.rx_crc_errors++;
 791                        if (status & RMD1_BUFF) dev->stats.rx_fifo_errors++;
 792                        head->flag &= (RMD1_ENP|RMD1_STP);
 793                } else {
 794                        /* Malloc up new buffer, compatible with net-3. */
 795//                      short pkt_len = head->msg_length;// & 0xfff;
 796                        short pkt_len = (head->msg_length & 0xfff) - 4;
 797                        struct sk_buff *skb;
 798
 799                        if (pkt_len < 60) {
 800                                printk( "%s: Runt packet!\n", dev->name );
 801                                dev->stats.rx_errors++;
 802                        }
 803                        else {
 804                                skb = netdev_alloc_skb(dev, pkt_len + 2);
 805                                if (skb == NULL) {
 806                                        dev->stats.rx_dropped++;
 807                                        head->msg_length = 0;
 808                                        head->flag |= RMD1_OWN_CHIP;
 809                                        lp->new_rx = (lp->new_rx+1) &
 810                                             RX_RING_MOD_MASK;
 811                                }
 812
 813#if 0
 814                                if (lance_debug >= 3) {
 815                                        u_char *data = PKTBUF_ADDR(head);
 816                                        printk("%s: RX pkt %d type 0x%04x"
 817                                               " from %pM to %pM",
 818                                               dev->name, lp->new_tx, ((u_short *)data)[6],
 819                                               &data[6], data);
 820
 821                                        printk(" data %02x %02x %02x %02x %02x %02x %02x %02x "
 822                                               "len %d at %08x\n",
 823                                               data[15], data[16], data[17], data[18],
 824                                               data[19], data[20], data[21], data[22],
 825                                               pkt_len, data);
 826                                }
 827#endif
 828                                if (lance_debug >= 3) {
 829                                        u_char *data = PKTBUF_ADDR(head);
 830                                        printk( "%s: RX pkt %d type 0x%04x len %d\n ", dev->name, entry, ((u_short *)data)[6], pkt_len);
 831                                }
 832
 833
 834                                skb_reserve( skb, 2 );  /* 16 byte align */
 835                                skb_put( skb, pkt_len );        /* Make room */
 836                                skb_copy_to_linear_data(skb,
 837                                                 PKTBUF_ADDR(head),
 838                                                 pkt_len);
 839
 840                                skb->protocol = eth_type_trans( skb, dev );
 841                                netif_rx( skb );
 842                                dev->stats.rx_packets++;
 843                                dev->stats.rx_bytes += pkt_len;
 844                        }
 845                }
 846
 847//              head->buf_length = -PKT_BUF_SZ | 0xf000;
 848                head->msg_length = 0;
 849                head->flag = RMD1_OWN_CHIP;
 850
 851                entry = lp->new_rx = (lp->new_rx +1) & RX_RING_MOD_MASK;
 852        }
 853
 854        /* From lance.c (Donald Becker): */
 855        /* We should check that at least two ring entries are free.
 856           If not, we should free one and mark stats->rx_dropped++. */
 857
 858        return 0;
 859}
 860
 861
 862static int lance_close( struct net_device *dev )
 863{
 864        struct lance_private *lp = netdev_priv(dev);
 865
 866        netif_stop_queue(dev);
 867
 868        AREG = CSR0;
 869
 870        DPRINTK( 2, ( "%s: Shutting down ethercard, status was %2.2x.\n",
 871                                  dev->name, DREG ));
 872
 873        /* We stop the LANCE here -- it occasionally polls
 874           memory if we don't. */
 875        DREG = CSR0_STOP;
 876        return 0;
 877}
 878
 879
 880/* Set or clear the multicast filter for this adaptor.
 881   num_addrs == -1              Promiscuous mode, receive all packets
 882   num_addrs == 0               Normal mode, clear multicast list
 883   num_addrs > 0                Multicast mode, receive normal and MC packets, and do
 884                                                best-effort filtering.
 885 */
 886
 887/* completely untested on a sun3 */
 888static void set_multicast_list( struct net_device *dev )
 889{
 890        struct lance_private *lp = netdev_priv(dev);
 891
 892        if(netif_queue_stopped(dev))
 893                /* Only possible if board is already started */
 894                return;
 895
 896        /* We take the simple way out and always enable promiscuous mode. */
 897        DREG = CSR0_STOP; /* Temporarily stop the lance. */
 898
 899        if (dev->flags & IFF_PROMISC) {
 900                /* Log any net taps. */
 901                DPRINTK( 3, ( "%s: Promiscuous mode enabled.\n", dev->name ));
 902                REGA( CSR15 ) = 0x8000; /* Set promiscuous mode */
 903        } else {
 904                short multicast_table[4];
 905                int num_addrs = netdev_mc_count(dev);
 906                int i;
 907                /* We don't use the multicast table, but rely on upper-layer
 908                 * filtering. */
 909                memset( multicast_table, (num_addrs == 0) ? 0 : -1,
 910                                sizeof(multicast_table) );
 911                for( i = 0; i < 4; i++ )
 912                        REGA( CSR8+i ) = multicast_table[i];
 913                REGA( CSR15 ) = 0; /* Unset promiscuous mode */
 914        }
 915
 916        /*
 917         * Always set BSWP after a STOP as STOP puts it back into
 918         * little endian mode.
 919         */
 920        REGA( CSR3 ) = CSR3_BSWP;
 921
 922        /* Resume normal operation and reset AREG to CSR0 */
 923        REGA( CSR0 ) = CSR0_IDON | CSR0_INEA | CSR0_STRT;
 924}
 925
 926
 927#ifdef MODULE
 928
 929static struct net_device *sun3lance_dev;
 930
 931int __init init_module(void)
 932{
 933        sun3lance_dev = sun3lance_probe(-1);
 934        return PTR_ERR_OR_ZERO(sun3lance_dev);
 935}
 936
 937void __exit cleanup_module(void)
 938{
 939        unregister_netdev(sun3lance_dev);
 940#ifdef CONFIG_SUN3
 941        iounmap((void __iomem *)sun3lance_dev->base_addr);
 942#endif
 943        free_netdev(sun3lance_dev);
 944}
 945
 946#endif /* MODULE */
 947
 948