drivers/net/lib82596.c

   1 /* lasi_82596.c -- driver for the intel 82596 ethernet controller, as
   2    munged into HPPA boxen .
   3
   4    This driver is based upon 82596.c, original credits are below...
   5    but there were too many hoops which HP wants jumped through to
   6    keep this code in there in a sane manner.
   7
   8    3 primary sources of the mess --
   9    1) hppa needs *lots* of cacheline flushing to keep this kind of
  10    MMIO running.
  11
  12    2) The 82596 needs to see all of its pointers as their physical
  13    address.  Thus virt_to_bus/bus_to_virt are *everywhere*.
  14
  15    3) The implementation HP is using seems to be significantly pickier
  16    about when and how the command and RX units are started.  some
  17    command ordering was changed.
  18
  19    Examination of the mach driver leads one to believe that there
  20    might be a saner way to pull this off...  anyone who feels like a
  21    full rewrite can be my guest.
  22
  23    Split 02/13/2000 Sam Creasey (sammy@oh.verio.com)
  24
  25    02/01/2000  Initial modifications for parisc by Helge Deller (deller@gmx.de)
  26    03/02/2000  changes for better/correct(?) cache-flushing (deller)
  27 */
  28
  29 /* 82596.c: A generic 82596 ethernet driver for linux. */
  30 /*
  31    Based on Apricot.c
  32    Written 1994 by Mark Evans.
  33    This driver is for the Apricot 82596 bus-master interface
  34
  35    Modularised 12/94 Mark Evans
  36
  37
  38    Modified to support the 82596 ethernet chips on 680x0 VME boards.
  39    by Richard Hirst <richard@sleepie.demon.co.uk>
  40    Renamed to be 82596.c
  41
  42    980825:  Changed to receive directly in to sk_buffs which are
  43    allocated at open() time.  Eliminates copy on incoming frames
  44    (small ones are still copied).  Shared data now held in a
  45    non-cached page, so we can run on 68060 in copyback mode.
  46
  47    TBD:
  48    * look at deferring rx frames rather than discarding (as per tulip)
  49    * handle tx ring full as per tulip
  50    * performace test to tune rx_copybreak
  51
  52    Most of my modifications relate to the braindead big-endian
  53    implementation by Intel.  When the i596 is operating in
  54    'big-endian' mode, it thinks a 32 bit value of 0x12345678
  55    should be stored as 0x56781234.  This is a real pain, when
  56    you have linked lists which are shared by the 680x0 and the
  57    i596.
  58
  59    Driver skeleton
  60    Written 1993 by Donald Becker.
  61    Copyright 1993 United States Government as represented by the Director,
  62    National Security Agency. This software may only be used and distributed
  63    according to the terms of the GNU General Public License as modified by SRC,
  64    incorporated herein by reference.
  65
  66    The author may be reached as becker@scyld.com, or C/O
  67    Scyld Computing Corporation, 410 Severn Ave., Suite 210, Annapolis MD 21403
  68
  69  */
  70
  71 #include <linux/module.h>
  72 #include <linux/kernel.h>
  73 #include <linux/string.h>
  74 #include <linux/errno.h>
  75 #include <linux/ioport.h>
  76 #include <linux/slab.h>
  77 #include <linux/interrupt.h>
  78 #include <linux/delay.h>
  79 #include <linux/netdevice.h>
  80 #include <linux/etherdevice.h>
  81 #include <linux/skbuff.h>
  82 #include <linux/init.h>
  83 #include <linux/types.h>
  84 #include <linux/bitops.h>
  85 #include <linux/dma-mapping.h>
  86 #include <linux/io.h>
  87 #include <linux/irq.h>
  88
  89 /* DEBUG flags
  90  */
  91
  92 #define DEB_INIT        0x0001
  93 #define DEB_PROBE       0x0002
  94 #define DEB_SERIOUS     0x0004
  95 #define DEB_ERRORS      0x0008
  96 #define DEB_MULTI       0x0010
  97 #define DEB_TDR         0x0020
  98 #define DEB_OPEN        0x0040
  99 #define DEB_RESET       0x0080
 100 #define DEB_ADDCMD      0x0100
 101 #define DEB_STATUS      0x0200
 102 #define DEB_STARTTX     0x0400
 103 #define DEB_RXADDR      0x0800
 104 #define DEB_TXADDR      0x1000
 105 #define DEB_RXFRAME     0x2000
 106 #define DEB_INTS        0x4000
 107 #define DEB_STRUCT      0x8000
 108 #define DEB_ANY         0xffff
 109
 110
 111 #define DEB(x, y)       if (i596_debug & (x)) { y; }
 112
 113
 114 /*
 115  * The MPU_PORT command allows direct access to the 82596. With PORT access
 116  * the following commands are available (p5-18). The 32-bit port command
 117  * must be word-swapped with the most significant word written first.
 118  * This only applies to VME boards.
 119  */
 120 #define PORT_RESET              0x00    /* reset 82596 */
 121 #define PORT_SELFTEST           0x01    /* selftest */
 122 #define PORT_ALTSCP             0x02    /* alternate SCB address */
 123 #define PORT_ALTDUMP            0x03    /* Alternate DUMP address */
 124
 125 static int i596_debug = (DEB_SERIOUS|DEB_PROBE);
 126
 127 /* Copy frames shorter than rx_copybreak, otherwise pass on up in
 128  * a full sized sk_buff.  Value of 100 stolen from tulip.c (!alpha).
 129  */
 130 static int rx_copybreak = 100;
 131
 132 #define PKT_BUF_SZ      1536
 133 #define MAX_MC_CNT      64
 134
 135 #define ISCP_BUSY       0x0001
 136
 137 #define I596_NULL ((u32)0xffffffff)
 138
 139 #define CMD_EOL         0x8000  /* The last command of the list, stop. */
 140 #define CMD_SUSP        0x4000  /* Suspend after doing cmd. */
 141 #define CMD_INTR        0x2000  /* Interrupt after doing cmd. */
 142
 143 #define CMD_FLEX        0x0008  /* Enable flexible memory model */
 144
 145 enum commands {
 146         CmdNOp = 0, CmdSASetup = 1, CmdConfigure = 2, CmdMulticastList = 3,
 147         CmdTx = 4, CmdTDR = 5, CmdDump = 6, CmdDiagnose = 7
 148 };
 149
 150 #define STAT_C          0x8000  /* Set to 0 after execution */
 151 #define STAT_B          0x4000  /* Command being executed */
 152 #define STAT_OK         0x2000  /* Command executed ok */
 153 #define STAT_A          0x1000  /* Command aborted */
 154
 155 #define  CUC_START      0x0100
 156 #define  CUC_RESUME     0x0200
 157 #define  CUC_SUSPEND    0x0300
 158 #define  CUC_ABORT      0x0400
 159 #define  RX_START       0x0010
 160 #define  RX_RESUME      0x0020
 161 #define  RX_SUSPEND     0x0030
 162 #define  RX_ABORT       0x0040
 163
 164 #define TX_TIMEOUT      5
 165
 166
 167 struct i596_reg {
 168         unsigned short porthi;
 169         unsigned short portlo;
 170         u32            ca;
 171 };
 172
 173 #define EOF             0x8000
 174 #define SIZE_MASK       0x3fff
 175
 176 struct i596_tbd {
 177         unsigned short size;
 178         unsigned short pad;
 179         u32            next;
 180         u32            data;
 181         u32 cache_pad[5];               /* Total 32 bytes... */
 182 };
 183
 184 /* The command structure has two 'next' pointers; v_next is the address of
 185  * the next command as seen by the CPU, b_next is the address of the next
 186  * command as seen by the 82596.  The b_next pointer, as used by the 82596
 187  * always references the status field of the next command, rather than the
 188  * v_next field, because the 82596 is unaware of v_next.  It may seem more
 189  * logical to put v_next at the end of the structure, but we cannot do that
 190  * because the 82596 expects other fields to be there, depending on command
 191  * type.
 192  */
 193
 194 struct i596_cmd {
 195         struct i596_cmd *v_next;        /* Address from CPUs viewpoint */
 196         unsigned short status;
 197         unsigned short command;
 198         u32            b_next;  /* Address from i596 viewpoint */
 199 };
 200
 201 struct tx_cmd {
 202         struct i596_cmd cmd;
 203         u32            tbd;
 204         unsigned short size;
 205         unsigned short pad;
 206         struct sk_buff *skb;            /* So we can free it after tx */
 207         dma_addr_t dma_addr;
 208 #ifdef __LP64__
 209         u32 cache_pad[6];               /* Total 64 bytes... */
 210 #else
 211         u32 cache_pad[1];               /* Total 32 bytes... */
 212 #endif
 213 };
 214
 215 struct tdr_cmd {
 216         struct i596_cmd cmd;
 217         unsigned short status;
 218         unsigned short pad;
 219 };
 220
 221 struct mc_cmd {
 222         struct i596_cmd cmd;
 223         short mc_cnt;
 224         char mc_addrs[MAX_MC_CNT*6];
 225 };
 226
 227 struct sa_cmd {
 228         struct i596_cmd cmd;
 229         char eth_addr[8];
 230 };
 231
 232 struct cf_cmd {
 233         struct i596_cmd cmd;
 234         char i596_config[16];
 235 };
 236
 237 struct i596_rfd {
 238         unsigned short stat;
 239         unsigned short cmd;
 240         u32            b_next;  /* Address from i596 viewpoint */
 241         u32            rbd;
 242         unsigned short count;
 243         unsigned short size;
 244         struct i596_rfd *v_next;        /* Address from CPUs viewpoint */
 245         struct i596_rfd *v_prev;
 246 #ifndef __LP64__
 247         u32 cache_pad[2];               /* Total 32 bytes... */
 248 #endif
 249 };
 250
 251 struct i596_rbd {
 252         /* hardware data */
 253         unsigned short count;
 254         unsigned short zero1;
 255         u32            b_next;
 256         u32            b_data;          /* Address from i596 viewpoint */
 257         unsigned short size;
 258         unsigned short zero2;
 259         /* driver data */
 260         struct sk_buff *skb;
 261         struct i596_rbd *v_next;
 262         u32            b_addr;          /* This rbd addr from i596 view */
 263         unsigned char *v_data;          /* Address from CPUs viewpoint */
 264                                         /* Total 32 bytes... */
 265 #ifdef __LP64__
 266     u32 cache_pad[4];
 267 #endif
 268 };
 269
 270 /* These values as chosen so struct i596_dma fits in one page... */
 271
 272 #define TX_RING_SIZE 32
 273 #define RX_RING_SIZE 16
 274
 275 struct i596_scb {
 276         unsigned short status;
 277         unsigned short command;
 278         u32           cmd;
 279         u32           rfd;
 280         u32           crc_err;
 281         u32           align_err;
 282         u32           resource_err;
 283         u32           over_err;
 284         u32           rcvdt_err;
 285         u32           short_err;
 286         unsigned short t_on;
 287         unsigned short t_off;
 288 };
 289
 290 struct i596_iscp {
 291         u32 stat;
 292         u32 scb;
 293 };
 294
 295 struct i596_scp {
 296         u32 sysbus;
 297         u32 pad;
 298         u32 iscp;
 299 };
 300
 301 struct i596_dma {
 302         struct i596_scp scp                     __attribute__((aligned(32)));
 303         volatile struct i596_iscp iscp          __attribute__((aligned(32)));
 304         volatile struct i596_scb scb            __attribute__((aligned(32)));
 305         struct sa_cmd sa_cmd                    __attribute__((aligned(32)));
 306         struct cf_cmd cf_cmd                    __attribute__((aligned(32)));
 307         struct tdr_cmd tdr_cmd                  __attribute__((aligned(32)));
 308         struct mc_cmd mc_cmd                    __attribute__((aligned(32)));
 309         struct i596_rfd rfds[RX_RING_SIZE]      __attribute__((aligned(32)));
 310         struct i596_rbd rbds[RX_RING_SIZE]      __attribute__((aligned(32)));
 311         struct tx_cmd tx_cmds[TX_RING_SIZE]     __attribute__((aligned(32)));
 312         struct i596_tbd tbds[TX_RING_SIZE]      __attribute__((aligned(32)));
 313 };
 314
 315 struct i596_private {
 316         struct i596_dma *dma;
 317         u32    stat;
 318         int last_restart;
 319         struct i596_rfd *rfd_head;
 320         struct i596_rbd *rbd_head;
 321         struct i596_cmd *cmd_tail;
 322         struct i596_cmd *cmd_head;
 323         int cmd_backlog;
 324         u32    last_cmd;
 325         int next_tx_cmd;
 326         int options;
 327         spinlock_t lock;       /* serialize access to chip */
 328         dma_addr_t dma_addr;
 329         void __iomem *mpu_port;
 330         void __iomem *ca;
 331 };
 332
 333 static const char init_setup[] =
 334 {
 335         0x8E,           /* length, prefetch on */
 336         0xC8,           /* fifo to 8, monitor off */
 337         0x80,           /* don't save bad frames */
 338         0x2E,           /* No source address insertion, 8 byte preamble */
 339         0x00,           /* priority and backoff defaults */
 340         0x60,           /* interframe spacing */
 341         0x00,           /* slot time LSB */
 342         0xf2,           /* slot time and retries */
 343         0x00,           /* promiscuous mode */
 344         0x00,           /* collision detect */
 345         0x40,           /* minimum frame length */
 346         0xff,
 347         0x00,
 348         0x7f /*  *multi IA */ };
 349
 350 static int i596_open(struct net_device *dev);
 351 static int i596_start_xmit(struct sk_buff *skb, struct net_device *dev);
 352 static irqreturn_t i596_interrupt(int irq, void *dev_id);
 353 static int i596_close(struct net_device *dev);
 354 static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd);
 355 static void i596_tx_timeout (struct net_device *dev);
 356 static void print_eth(unsigned char *buf, char *str);
 357 static void set_multicast_list(struct net_device *dev);
 358 static inline void ca(struct net_device *dev);
 359 static void mpu_port(struct net_device *dev, int c, dma_addr_t x);
 360
 361 static int rx_ring_size = RX_RING_SIZE;
 362 static int ticks_limit = 100;
 363 static int max_cmd_backlog = TX_RING_SIZE-1;
 364
 365 #ifdef CONFIG_NET_POLL_CONTROLLER
 366 static void i596_poll_controller(struct net_device *dev);
 367 #endif
 368
 369
 370 static inline int wait_istat(struct net_device *dev, struct i596_dma *dma, int delcnt, char *str)
 371 {
 372         DMA_INV(dev, &(dma->iscp), sizeof(struct i596_iscp));
 373         while (--delcnt && dma->iscp.stat) {
 374                 udelay(10);
 375                 DMA_INV(dev, &(dma->iscp), sizeof(struct i596_iscp));
 376         }
 377         if (!delcnt) {
 378                 printk(KERN_ERR "%s: %s, iscp.stat %04x, didn't clear\n",
 379                      dev->name, str, SWAP16(dma->iscp.stat));
 380                 return -1;
 381         } else
 382                 return 0;
 383 }
 384
 385
 386 static inline int wait_cmd(struct net_device *dev, struct i596_dma *dma, int delcnt, char *str)
 387 {
 388         DMA_INV(dev, &(dma->scb), sizeof(struct i596_scb));
 389         while (--delcnt && dma->scb.command) {
 390                 udelay(10);
 391                 DMA_INV(dev, &(dma->scb), sizeof(struct i596_scb));
 392         }
 393         if (!delcnt) {
 394                 printk(KERN_ERR "%s: %s, status %4.4x, cmd %4.4x.\n",
 395                        dev->name, str,
 396                        SWAP16(dma->scb.status),
 397                        SWAP16(dma->scb.command));
 398                 return -1;
 399         } else
 400                 return 0;
 401 }
 402
 403
 404 static void i596_display_data(struct net_device *dev)
 405 {
 406         struct i596_private *lp = netdev_priv(dev);
 407         struct i596_dma *dma = lp->dma;
 408         struct i596_cmd *cmd;
 409         struct i596_rfd *rfd;
 410         struct i596_rbd *rbd;
 411
 412         printk(KERN_DEBUG "lp and scp at %p, .sysbus = %08x, .iscp = %08x\n",
 413                &dma->scp, dma->scp.sysbus, SWAP32(dma->scp.iscp));
 414         printk(KERN_DEBUG "iscp at %p, iscp.stat = %08x, .scb = %08x\n",
 415                &dma->iscp, SWAP32(dma->iscp.stat), SWAP32(dma->iscp.scb));
 416         printk(KERN_DEBUG "scb at %p, scb.status = %04x, .command = %04x,"
 417                 " .cmd = %08x, .rfd = %08x\n",
 418                &dma->scb, SWAP16(dma->scb.status), SWAP16(dma->scb.command),
 419                 SWAP16(dma->scb.cmd), SWAP32(dma->scb.rfd));
 420         printk(KERN_DEBUG "   errors: crc %x, align %x, resource %x,"
 421                " over %x, rcvdt %x, short %x\n",
 422                SWAP32(dma->scb.crc_err), SWAP32(dma->scb.align_err),
 423                SWAP32(dma->scb.resource_err), SWAP32(dma->scb.over_err),
 424                SWAP32(dma->scb.rcvdt_err), SWAP32(dma->scb.short_err));
 425         cmd = lp->cmd_head;
 426         while (cmd != NULL) {
 427                 printk(KERN_DEBUG
 428                        "cmd at %p, .status = %04x, .command = %04x,"
 429                        " .b_next = %08x\n",
 430                        cmd, SWAP16(cmd->status), SWAP16(cmd->command),
 431                        SWAP32(cmd->b_next));
 432                 cmd = cmd->v_next;
 433         }
 434         rfd = lp->rfd_head;
 435         printk(KERN_DEBUG "rfd_head = %p\n", rfd);
 436         do {
 437                 printk(KERN_DEBUG
 438                        "   %p .stat %04x, .cmd %04x, b_next %08x, rbd %08x,"
 439                        " count %04x\n",
 440                        rfd, SWAP16(rfd->stat), SWAP16(rfd->cmd),
 441                        SWAP32(rfd->b_next), SWAP32(rfd->rbd),
 442                        SWAP16(rfd->count));
 443                 rfd = rfd->v_next;
 444         } while (rfd != lp->rfd_head);
 445         rbd = lp->rbd_head;
 446         printk(KERN_DEBUG "rbd_head = %p\n", rbd);
 447         do {
 448                 printk(KERN_DEBUG
 449                        "   %p .count %04x, b_next %08x, b_data %08x,"
 450                        " size %04x\n",
 451                         rbd, SWAP16(rbd->count), SWAP32(rbd->b_next),
 452                        SWAP32(rbd->b_data), SWAP16(rbd->size));
 453                 rbd = rbd->v_next;
 454         } while (rbd != lp->rbd_head);
 455         DMA_INV(dev, dma, sizeof(struct i596_dma));
 456 }
 457
 458
 459 #define virt_to_dma(lp, v) ((lp)->dma_addr + (dma_addr_t)((unsigned long)(v)-(unsigned long)((lp)->dma)))
 460
 461 static inline int init_rx_bufs(struct net_device *dev)
 462 {
 463         struct i596_private *lp = netdev_priv(dev);
 464         struct i596_dma *dma = lp->dma;
 465         int i;
 466         struct i596_rfd *rfd;
 467         struct i596_rbd *rbd;
 468
 469         /* First build the Receive Buffer Descriptor List */
 470
 471         for (i = 0, rbd = dma->rbds; i < rx_ring_size; i++, rbd++) {
 472                 dma_addr_t dma_addr;
 473                 struct sk_buff *skb = netdev_alloc_skb(dev, PKT_BUF_SZ + 4);
 474
 475                 if (skb == NULL)
 476                         return -1;
 477                 skb_reserve(skb, 2);
 478                 dma_addr = dma_map_single(dev->dev.parent, skb->data,
 479                                           PKT_BUF_SZ, DMA_FROM_DEVICE);
 480                 rbd->v_next = rbd+1;
 481                 rbd->b_next = SWAP32(virt_to_dma(lp, rbd+1));
 482                 rbd->b_addr = SWAP32(virt_to_dma(lp, rbd));
 483                 rbd->skb = skb;
 484                 rbd->v_data = skb->data;
 485                 rbd->b_data = SWAP32(dma_addr);
 486                 rbd->size = SWAP16(PKT_BUF_SZ);
 487         }
 488         lp->rbd_head = dma->rbds;
 489         rbd = dma->rbds + rx_ring_size - 1;
 490         rbd->v_next = dma->rbds;
 491         rbd->b_next = SWAP32(virt_to_dma(lp, dma->rbds));
 492
 493         /* Now build the Receive Frame Descriptor List */
 494
 495         for (i = 0, rfd = dma->rfds; i < rx_ring_size; i++, rfd++) {
 496                 rfd->rbd = I596_NULL;
 497                 rfd->v_next = rfd+1;
 498                 rfd->v_prev = rfd-1;
 499                 rfd->b_next = SWAP32(virt_to_dma(lp, rfd+1));
 500                 rfd->cmd = SWAP16(CMD_FLEX);
 501         }
 502         lp->rfd_head = dma->rfds;
 503         dma->scb.rfd = SWAP32(virt_to_dma(lp, dma->rfds));
 504         rfd = dma->rfds;
 505         rfd->rbd = SWAP32(virt_to_dma(lp, lp->rbd_head));
 506         rfd->v_prev = dma->rfds + rx_ring_size - 1;
 507         rfd = dma->rfds + rx_ring_size - 1;
 508         rfd->v_next = dma->rfds;
 509         rfd->b_next = SWAP32(virt_to_dma(lp, dma->rfds));
 510         rfd->cmd = SWAP16(CMD_EOL|CMD_FLEX);
 511
 512         DMA_WBACK_INV(dev, dma, sizeof(struct i596_dma));
 513         return 0;
 514 }
 515
 516 static inline void remove_rx_bufs(struct net_device *dev)
 517 {
 518         struct i596_private *lp = netdev_priv(dev);
 519         struct i596_rbd *rbd;
 520         int i;
 521
 522         for (i = 0, rbd = lp->dma->rbds; i < rx_ring_size; i++, rbd++) {
 523                 if (rbd->skb == NULL)
 524                         break;
 525                 dma_unmap_single(dev->dev.parent,
 526                                  (dma_addr_t)SWAP32(rbd->b_data),
 527                                  PKT_BUF_SZ, DMA_FROM_DEVICE);
 528                 dev_kfree_skb(rbd->skb);
 529         }
 530 }
 531
 532
 533 static void rebuild_rx_bufs(struct net_device *dev)
 534 {
 535         struct i596_private *lp = netdev_priv(dev);
 536         struct i596_dma *dma = lp->dma;
 537         int i;
 538
 539         /* Ensure rx frame/buffer descriptors are tidy */
 540
 541         for (i = 0; i < rx_ring_size; i++) {
 542                 dma->rfds[i].rbd = I596_NULL;
 543                 dma->rfds[i].cmd = SWAP16(CMD_FLEX);
 544         }
 545         dma->rfds[rx_ring_size-1].cmd = SWAP16(CMD_EOL|CMD_FLEX);
 546         lp->rfd_head = dma->rfds;
 547         dma->scb.rfd = SWAP32(virt_to_dma(lp, dma->rfds));
 548         lp->rbd_head = dma->rbds;
 549         dma->rfds[0].rbd = SWAP32(virt_to_dma(lp, dma->rbds));
 550
 551         DMA_WBACK_INV(dev, dma, sizeof(struct i596_dma));
 552 }
 553
 554
 555 static int init_i596_mem(struct net_device *dev)
 556 {
 557         struct i596_private *lp = netdev_priv(dev);
 558         struct i596_dma *dma = lp->dma;
 559         unsigned long flags;
 560
 561         mpu_port(dev, PORT_RESET, 0);
 562         udelay(100);                    /* Wait 100us - seems to help */
 563
 564         /* change the scp address */
 565
 566         lp->last_cmd = jiffies;
 567
 568         dma->scp.sysbus = SYSBUS;
 569         dma->scp.iscp = SWAP32(virt_to_dma(lp, &(dma->iscp)));
 570         dma->iscp.scb = SWAP32(virt_to_dma(lp, &(dma->scb)));
 571         dma->iscp.stat = SWAP32(ISCP_BUSY);
 572         lp->cmd_backlog = 0;
 573
 574         lp->cmd_head = NULL;
 575         dma->scb.cmd = I596_NULL;
 576
 577         DEB(DEB_INIT, printk(KERN_DEBUG "%s: starting i82596.\n", dev->name));
 578
 579         DMA_WBACK(dev, &(dma->scp), sizeof(struct i596_scp));
 580         DMA_WBACK(dev, &(dma->iscp), sizeof(struct i596_iscp));
 581         DMA_WBACK(dev, &(dma->scb), sizeof(struct i596_scb));
 582
 583         mpu_port(dev, PORT_ALTSCP, virt_to_dma(lp, &dma->scp));
 584         ca(dev);
 585         if (wait_istat(dev, dma, 1000, "initialization timed out"))
 586                 goto failed;
 587         DEB(DEB_INIT, printk(KERN_DEBUG
 588                              "%s: i82596 initialization successful\n",
 589                              dev->name));
 590
 591         if (request_irq(dev->irq, &i596_interrupt, 0, "i82596", dev)) {
 592                 printk(KERN_ERR "%s: IRQ %d not free\n", dev->name, dev->irq);
 593                 goto failed;
 594         }
 595
 596         /* Ensure rx frame/buffer descriptors are tidy */
 597         rebuild_rx_bufs(dev);
 598
 599         dma->scb.command = 0;
 600         DMA_WBACK(dev, &(dma->scb), sizeof(struct i596_scb));
 601
 602         DEB(DEB_INIT, printk(KERN_DEBUG
 603                              "%s: queuing CmdConfigure\n", dev->name));
 604         memcpy(dma->cf_cmd.i596_config, init_setup, 14);
 605         dma->cf_cmd.cmd.command = SWAP16(CmdConfigure);
 606         DMA_WBACK(dev, &(dma->cf_cmd), sizeof(struct cf_cmd));
 607         i596_add_cmd(dev, &dma->cf_cmd.cmd);
 608
 609         DEB(DEB_INIT, printk(KERN_DEBUG "%s: queuing CmdSASetup\n", dev->name));
 610         memcpy(dma->sa_cmd.eth_addr, dev->dev_addr, 6);
 611         dma->sa_cmd.cmd.command = SWAP16(CmdSASetup);
 612         DMA_WBACK(dev, &(dma->sa_cmd), sizeof(struct sa_cmd));
 613         i596_add_cmd(dev, &dma->sa_cmd.cmd);
 614
 615         DEB(DEB_INIT, printk(KERN_DEBUG "%s: queuing CmdTDR\n", dev->name));
 616         dma->tdr_cmd.cmd.command = SWAP16(CmdTDR);
 617         DMA_WBACK(dev, &(dma->tdr_cmd), sizeof(struct tdr_cmd));
 618         i596_add_cmd(dev, &dma->tdr_cmd.cmd);
 619
 620         spin_lock_irqsave (&lp->lock, flags);
 621
 622         if (wait_cmd(dev, dma, 1000, "timed out waiting to issue RX_START")) {
 623                 spin_unlock_irqrestore (&lp->lock, flags);
 624                 goto failed_free_irq;
 625         }
 626         DEB(DEB_INIT, printk(KERN_DEBUG "%s: Issuing RX_START\n", dev->name));
 627         dma->scb.command = SWAP16(RX_START);
 628         dma->scb.rfd = SWAP32(virt_to_dma(lp, dma->rfds));
 629         DMA_WBACK(dev, &(dma->scb), sizeof(struct i596_scb));
 630
 631         ca(dev);
 632
 633         spin_unlock_irqrestore (&lp->lock, flags);
 634         if (wait_cmd(dev, dma, 1000, "RX_START not processed"))
 635                 goto failed_free_irq;
 636         DEB(DEB_INIT, printk(KERN_DEBUG
 637                              "%s: Receive unit started OK\n", dev->name));
 638         return 0;
 639
 640 failed_free_irq:
 641         free_irq(dev->irq, dev);
 642 failed:
 643         printk(KERN_ERR "%s: Failed to initialise 82596\n", dev->name);
 644         mpu_port(dev, PORT_RESET, 0);
 645         return -1;
 646 }
 647
 648
 649 static inline int i596_rx(struct net_device *dev)
 650 {
 651         struct i596_private *lp = netdev_priv(dev);
 652         struct i596_rfd *rfd;
 653         struct i596_rbd *rbd;
 654         int frames = 0;
 655
 656         DEB(DEB_RXFRAME, printk(KERN_DEBUG
 657                                 "i596_rx(), rfd_head %p, rbd_head %p\n",
 658                                 lp->rfd_head, lp->rbd_head));
 659
 660
 661         rfd = lp->rfd_head;             /* Ref next frame to check */
 662
 663         DMA_INV(dev, rfd, sizeof(struct i596_rfd));
 664         while (rfd->stat & SWAP16(STAT_C)) {    /* Loop while complete frames */
 665                 if (rfd->rbd == I596_NULL)
 666                         rbd = NULL;
 667                 else if (rfd->rbd == lp->rbd_head->b_addr) {
 668                         rbd = lp->rbd_head;
 669                         DMA_INV(dev, rbd, sizeof(struct i596_rbd));
 670                 } else {
 671                         printk(KERN_ERR "%s: rbd chain broken!\n", dev->name);
 672                         /* XXX Now what? */
 673                         rbd = NULL;
 674                 }
 675                 DEB(DEB_RXFRAME, printk(KERN_DEBUG
 676                                       "  rfd %p, rfd.rbd %08x, rfd.stat %04x\n",
 677                                       rfd, rfd->rbd, rfd->stat));
 678
 679                 if (rbd != NULL && (rfd->stat & SWAP16(STAT_OK))) {
 680                         /* a good frame */
 681                         int pkt_len = SWAP16(rbd->count) & 0x3fff;
 682                         struct sk_buff *skb = rbd->skb;
 683                         int rx_in_place = 0;
 684
 685                         DEB(DEB_RXADDR, print_eth(rbd->v_data, "received"));
 686                         frames++;
 687
 688                         /* Check if the packet is long enough to just accept
 689                          * without copying to a properly sized skbuff.
 690                          */
 691
 692                         if (pkt_len > rx_copybreak) {
 693                                 struct sk_buff *newskb;
 694                                 dma_addr_t dma_addr;
 695
 696                                 dma_unmap_single(dev->dev.parent,
 697                                                  (dma_addr_t)SWAP32(rbd->b_data),
 698                                                  PKT_BUF_SZ, DMA_FROM_DEVICE);
 699                                 /* Get fresh skbuff to replace filled one. */
 700                                 newskb = netdev_alloc_skb(dev, PKT_BUF_SZ + 4);
 701                                 if (newskb == NULL) {
 702                                         skb = NULL;     /* drop pkt */
 703                                         goto memory_squeeze;
 704                                 }
 705                                 skb_reserve(newskb, 2);
 706
 707                                 /* Pass up the skb already on the Rx ring. */
 708                                 skb_put(skb, pkt_len);
 709                                 rx_in_place = 1;
 710                                 rbd->skb = newskb;
 711                                 dma_addr = dma_map_single(dev->dev.parent,
 712                                                           newskb->data,
 713                                                           PKT_BUF_SZ,
 714                                                           DMA_FROM_DEVICE);
 715                                 rbd->v_data = newskb->data;
 716                                 rbd->b_data = SWAP32(dma_addr);
 717                                 DMA_WBACK_INV(dev, rbd, sizeof(struct i596_rbd));
 718                         } else
 719                                 skb = netdev_alloc_skb(dev, pkt_len + 2);
 720 memory_squeeze:
 721                         if (skb == NULL) {
 722                                 /* XXX tulip.c can defer packets here!! */
 723                                 printk(KERN_ERR
 724                                        "%s: i596_rx Memory squeeze, dropping packet.\n",
 725                                        dev->name);
 726                                 dev->stats.rx_dropped++;
 727                         } else {
 728                                 if (!rx_in_place) {
 729                                         /* 16 byte align the data fields */
 730                                         dma_sync_single_for_cpu(dev->dev.parent,
 731                                                                 (dma_addr_t)SWAP32(rbd->b_data),
 732                                                                 PKT_BUF_SZ, DMA_FROM_DEVICE);
 733                                         skb_reserve(skb, 2);
 734                                         memcpy(skb_put(skb, pkt_len), rbd->v_data, pkt_len);
 735                                         dma_sync_single_for_device(dev->dev.parent,
 736                                                                    (dma_addr_t)SWAP32(rbd->b_data),
 737                                                                    PKT_BUF_SZ, DMA_FROM_DEVICE);
 738                                 }
 739                                 skb->len = pkt_len;
 740                                 skb->protocol = eth_type_trans(skb, dev);
 741                                 netif_rx(skb);
 742                                 dev->stats.rx_packets++;
 743                                 dev->stats.rx_bytes += pkt_len;
 744                         }
 745                 } else {
 746                         DEB(DEB_ERRORS, printk(KERN_DEBUG
 747                                                "%s: Error, rfd.stat = 0x%04x\n",
 748                                                dev->name, rfd->stat));
 749                         dev->stats.rx_errors++;
 750                         if (rfd->stat & SWAP16(0x0100))
 751                                 dev->stats.collisions++;
 752                         if (rfd->stat & SWAP16(0x8000))
 753                                 dev->stats.rx_length_errors++;
 754                         if (rfd->stat & SWAP16(0x0001))
 755                                 dev->stats.rx_over_errors++;
 756                         if (rfd->stat & SWAP16(0x0002))
 757                                 dev->stats.rx_fifo_errors++;
 758                         if (rfd->stat & SWAP16(0x0004))
 759                                 dev->stats.rx_frame_errors++;
 760                         if (rfd->stat & SWAP16(0x0008))
 761                                 dev->stats.rx_crc_errors++;
 762                         if (rfd->stat & SWAP16(0x0010))
 763                                 dev->stats.rx_length_errors++;
 764                 }
 765
 766                 /* Clear the buffer descriptor count and EOF + F flags */
 767
 768                 if (rbd != NULL && (rbd->count & SWAP16(0x4000))) {
 769                         rbd->count = 0;
 770                         lp->rbd_head = rbd->v_next;
 771                         DMA_WBACK_INV(dev, rbd, sizeof(struct i596_rbd));
 772                 }
 773
 774                 /* Tidy the frame descriptor, marking it as end of list */
 775
 776                 rfd->rbd = I596_NULL;
 777                 rfd->stat = 0;
 778                 rfd->cmd = SWAP16(CMD_EOL|CMD_FLEX);
 779                 rfd->count = 0;
 780
 781                 /* Update record of next frame descriptor to process */
 782
 783                 lp->dma->scb.rfd = rfd->b_next;
 784                 lp->rfd_head = rfd->v_next;
 785                 DMA_WBACK_INV(dev, rfd, sizeof(struct i596_rfd));
 786
 787                 /* Remove end-of-list from old end descriptor */
 788
 789                 rfd->v_prev->cmd = SWAP16(CMD_FLEX);
 790                 DMA_WBACK_INV(dev, rfd->v_prev, sizeof(struct i596_rfd));
 791                 rfd = lp->rfd_head;
 792                 DMA_INV(dev, rfd, sizeof(struct i596_rfd));
 793         }
 794
 795         DEB(DEB_RXFRAME, printk(KERN_DEBUG "frames %d\n", frames));
 796
 797         return 0;
 798 }
 799
 800
 801 static inline void i596_cleanup_cmd(struct net_device *dev, struct i596_private *lp)
 802 {
 803         struct i596_cmd *ptr;
 804
 805         while (lp->cmd_head != NULL) {
 806                 ptr = lp->cmd_head;
 807                 lp->cmd_head = ptr->v_next;
 808                 lp->cmd_backlog--;
 809
 810                 switch (SWAP16(ptr->command) & 0x7) {
 811                 case CmdTx:
 812                         {
 813                                 struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
 814                                 struct sk_buff *skb = tx_cmd->skb;
 815                                 dma_unmap_single(dev->dev.parent,
 816                                                  tx_cmd->dma_addr,
 817                                                  skb->len, DMA_TO_DEVICE);
 818
 819                                 dev_kfree_skb(skb);
 820
 821                                 dev->stats.tx_errors++;
 822                                 dev->stats.tx_aborted_errors++;
 823
 824                                 ptr->v_next = NULL;
 825                                 ptr->b_next = I596_NULL;
 826                                 tx_cmd->cmd.command = 0;  /* Mark as free */
 827                                 break;
 828                         }
 829                 default:
 830                         ptr->v_next = NULL;
 831                         ptr->b_next = I596_NULL;
 832                 }
 833                 DMA_WBACK_INV(dev, ptr, sizeof(struct i596_cmd));
 834         }
 835
 836         wait_cmd(dev, lp->dma, 100, "i596_cleanup_cmd timed out");
 837         lp->dma->scb.cmd = I596_NULL;
 838         DMA_WBACK(dev, &(lp->dma->scb), sizeof(struct i596_scb));
 839 }
 840
 841
 842 static inline void i596_reset(struct net_device *dev, struct i596_private *lp)
 843 {
 844         unsigned long flags;
 845
 846         DEB(DEB_RESET, printk(KERN_DEBUG "i596_reset\n"));
 847
 848         spin_lock_irqsave (&lp->lock, flags);
 849
 850         wait_cmd(dev, lp->dma, 100, "i596_reset timed out");
 851
 852         netif_stop_queue(dev);
 853
 854         /* FIXME: this command might cause an lpmc */
 855         lp->dma->scb.command = SWAP16(CUC_ABORT | RX_ABORT);
 856         DMA_WBACK(dev, &(lp->dma->scb), sizeof(struct i596_scb));
 857         ca(dev);
 858
 859         /* wait for shutdown */
 860         wait_cmd(dev, lp->dma, 1000, "i596_reset 2 timed out");
 861         spin_unlock_irqrestore (&lp->lock, flags);
 862
 863         i596_cleanup_cmd(dev, lp);
 864         i596_rx(dev);
 865
 866         netif_start_queue(dev);
 867         init_i596_mem(dev);
 868 }
 869
 870
 871 static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd)
 872 {
 873         struct i596_private *lp = netdev_priv(dev);
 874         struct i596_dma *dma = lp->dma;
 875         unsigned long flags;
 876
 877         DEB(DEB_ADDCMD, printk(KERN_DEBUG "i596_add_cmd cmd_head %p\n",
 878                                lp->cmd_head));
 879
 880         cmd->status = 0;
 881         cmd->command |= SWAP16(CMD_EOL | CMD_INTR);
 882         cmd->v_next = NULL;
 883         cmd->b_next = I596_NULL;
 884         DMA_WBACK(dev, cmd, sizeof(struct i596_cmd));
 885
 886         spin_lock_irqsave (&lp->lock, flags);
 887
 888         if (lp->cmd_head != NULL) {
 889                 lp->cmd_tail->v_next = cmd;
 890                 lp->cmd_tail->b_next = SWAP32(virt_to_dma(lp, &cmd->status));
 891                 DMA_WBACK(dev, lp->cmd_tail, sizeof(struct i596_cmd));
 892         } else {
 893                 lp->cmd_head = cmd;
 894                 wait_cmd(dev, dma, 100, "i596_add_cmd timed out");
 895                 dma->scb.cmd = SWAP32(virt_to_dma(lp, &cmd->status));
 896                 dma->scb.command = SWAP16(CUC_START);
 897                 DMA_WBACK(dev, &(dma->scb), sizeof(struct i596_scb));
 898                 ca(dev);
 899         }
 900         lp->cmd_tail = cmd;
 901         lp->cmd_backlog++;
 902
 903         spin_unlock_irqrestore (&lp->lock, flags);
 904
 905         if (lp->cmd_backlog > max_cmd_backlog) {
 906                 unsigned long tickssofar = jiffies - lp->last_cmd;
 907
 908                 if (tickssofar < ticks_limit)
 909                         return;
 910
 911                 printk(KERN_ERR
 912                        "%s: command unit timed out, status resetting.\n",
 913                        dev->name);
 914 #if 1
 915                 i596_reset(dev, lp);
 916 #endif
 917         }
 918 }
 919
 920 static int i596_open(struct net_device *dev)
 921 {
 922         DEB(DEB_OPEN, printk(KERN_DEBUG
 923                              "%s: i596_open() irq %d.\n", dev->name, dev->irq));
 924
 925         if (init_rx_bufs(dev)) {
 926                 printk(KERN_ERR "%s: Failed to init rx bufs\n", dev->name);
 927                 return -EAGAIN;
 928         }
 929         if (init_i596_mem(dev)) {
 930                 printk(KERN_ERR "%s: Failed to init memory\n", dev->name);
 931                 goto out_remove_rx_bufs;
 932         }
 933         netif_start_queue(dev);
 934
 935         return 0;
 936
 937 out_remove_rx_bufs:
 938         remove_rx_bufs(dev);
 939         return -EAGAIN;
 940 }
 941
 942 static void i596_tx_timeout (struct net_device *dev)
 943 {
 944         struct i596_private *lp = netdev_priv(dev);
 945
 946         /* Transmitter timeout, serious problems. */
 947         DEB(DEB_ERRORS, printk(KERN_DEBUG
 948                                "%s: transmit timed out, status resetting.\n",
 949                                dev->name));
 950
 951         dev->stats.tx_errors++;
 952
 953         /* Try to restart the adaptor */
 954         if (lp->last_restart == dev->stats.tx_packets) {
 955                 DEB(DEB_ERRORS, printk(KERN_DEBUG "Resetting board.\n"));
 956                 /* Shutdown and restart */
 957                 i596_reset (dev, lp);
 958         } else {
 959                 /* Issue a channel attention signal */
 960                 DEB(DEB_ERRORS, printk(KERN_DEBUG "Kicking board.\n"));
 961                 lp->dma->scb.command = SWAP16(CUC_START | RX_START);
 962                 DMA_WBACK_INV(dev, &(lp->dma->scb), sizeof(struct i596_scb));
 963                 ca (dev);
 964                 lp->last_restart = dev->stats.tx_packets;
 965         }
 966
 967         dev->trans_start = jiffies;
 968         netif_wake_queue (dev);
 969 }
 970
 971
 972 static int i596_start_xmit(struct sk_buff *skb, struct net_device *dev)
 973 {
 974         struct i596_private *lp = netdev_priv(dev);
 975         struct tx_cmd *tx_cmd;
 976         struct i596_tbd *tbd;
 977         short length = skb->len;
 978         dev->trans_start = jiffies;
 979
 980         DEB(DEB_STARTTX, printk(KERN_DEBUG
 981                                 "%s: i596_start_xmit(%x,%p) called\n",
 982                                 dev->name, skb->len, skb->data));
 983
 984         if (length < ETH_ZLEN) {
 985                 if (skb_padto(skb, ETH_ZLEN))
 986                         return 0;
 987                 length = ETH_ZLEN;
 988         }
 989
 990         netif_stop_queue(dev);
 991
 992         tx_cmd = lp->dma->tx_cmds + lp->next_tx_cmd;
 993         tbd = lp->dma->tbds + lp->next_tx_cmd;
 994
 995         if (tx_cmd->cmd.command) {
 996                 DEB(DEB_ERRORS, printk(KERN_DEBUG
 997                                        "%s: xmit ring full, dropping packet.\n",
 998                                        dev->name));
 999                 dev->stats.tx_dropped++;
1000
1001                 dev_kfree_skb(skb);
1002         } else {
1003                 if (++lp->next_tx_cmd == TX_RING_SIZE)
1004                         lp->next_tx_cmd = 0;
1005                 tx_cmd->tbd = SWAP32(virt_to_dma(lp, tbd));
1006                 tbd->next = I596_NULL;
1007
1008                 tx_cmd->cmd.command = SWAP16(CMD_FLEX | CmdTx);
1009                 tx_cmd->skb = skb;
1010
1011                 tx_cmd->pad = 0;
1012                 tx_cmd->size = 0;
1013                 tbd->pad = 0;
1014                 tbd->size = SWAP16(EOF | length);
1015
1016                 tx_cmd->dma_addr = dma_map_single(dev->dev.parent, skb->data,
1017                                                   skb->len, DMA_TO_DEVICE);
1018                 tbd->data = SWAP32(tx_cmd->dma_addr);
1019
1020                 DEB(DEB_TXADDR, print_eth(skb->data, "tx-queued"));
1021                 DMA_WBACK_INV(dev, tx_cmd, sizeof(struct tx_cmd));
1022                 DMA_WBACK_INV(dev, tbd, sizeof(struct i596_tbd));
1023                 i596_add_cmd(dev, &tx_cmd->cmd);
1024
1025                 dev->stats.tx_packets++;
1026                 dev->stats.tx_bytes += length;
1027         }
1028
1029         netif_start_queue(dev);
1030
1031         return 0;
1032 }
1033
1034 static void print_eth(unsigned char *add, char *str)
1035 {
1036         printk(KERN_DEBUG "i596 0x%p, %pM --> %pM %02X%02X, %s\n",
1037                add, add + 6, add, add[12], add[13], str);
1038 }
1039 static const struct net_device_ops i596_netdev_ops = {
1040         .ndo_open               = i596_open,
1041         .ndo_stop               = i596_close,
1042         .ndo_start_xmit         = i596_start_xmit,
1043         .ndo_set_multicast_list = set_multicast_list,
1044         .ndo_tx_timeout         = i596_tx_timeout,
1045         .ndo_change_mtu         = eth_change_mtu,
1046         .ndo_validate_addr      = eth_validate_addr,
1047         .ndo_set_mac_address    = eth_mac_addr,
1048 #ifdef CONFIG_NET_POLL_CONTROLLER
1049         .ndo_poll_controller    = i596_poll_controller,
1050 #endif
1051 };
1052
1053 static int __devinit i82596_probe(struct net_device *dev)
1054 {
1055         int i;
1056         struct i596_private *lp = netdev_priv(dev);
1057         struct i596_dma *dma;
1058
1059         /* This lot is ensure things have been cache line aligned. */
1060         BUILD_BUG_ON(sizeof(struct i596_rfd) != 32);
1061         BUILD_BUG_ON(sizeof(struct i596_rbd) &  31);
1062         BUILD_BUG_ON(sizeof(struct tx_cmd)   &  31);
1063         BUILD_BUG_ON(sizeof(struct i596_tbd) != 32);
1064 #ifndef __LP64__
1065         BUILD_BUG_ON(sizeof(struct i596_dma) > 4096);
1066 #endif
1067
1068         if (!dev->base_addr || !dev->irq)
1069                 return -ENODEV;
1070
1071         dma = (struct i596_dma *) DMA_ALLOC(dev->dev.parent,
1072                 sizeof(struct i596_dma), &lp->dma_addr, GFP_KERNEL);
1073         if (!dma) {
1074                 printk(KERN_ERR "%s: Couldn't get shared memory\n", __FILE__);
1075                 return -ENOMEM;
1076         }
1077
1078         dev->netdev_ops = &i596_netdev_ops;
1079         dev->watchdog_timeo = TX_TIMEOUT;
1080
1081         memset(dma, 0, sizeof(struct i596_dma));
1082         lp->dma = dma;
1083
1084         dma->scb.command = 0;
1085         dma->scb.cmd = I596_NULL;
1086         dma->scb.rfd = I596_NULL;
1087         spin_lock_init(&lp->lock);
1088
1089         DMA_WBACK_INV(dev, dma, sizeof(struct i596_dma));
1090
1091         i = register_netdev(dev);
1092         if (i) {
1093                 DMA_FREE(dev->dev.parent, sizeof(struct i596_dma),
1094                                     (void *)dma, lp->dma_addr);
1095                 return i;
1096         };
1097
1098         DEB(DEB_PROBE, printk(KERN_INFO "%s: 82596 at %#3lx,",
1099                               dev->name, dev->base_addr));
1100         for (i = 0; i < 6; i++)
1101                 DEB(DEB_PROBE, printk(" %2.2X", dev->dev_addr[i]));
1102         DEB(DEB_PROBE, printk(" IRQ %d.\n", dev->irq));
1103         DEB(DEB_INIT, printk(KERN_INFO
1104                              "%s: dma at 0x%p (%d bytes), lp->scb at 0x%p\n",
1105                              dev->name, dma, (int)sizeof(struct i596_dma),
1106                              &dma->scb));
1107
1108         return 0;
1109 }
1110
1111 #ifdef CONFIG_NET_POLL_CONTROLLER
1112 static void i596_poll_controller(struct net_device *dev)
1113 {
1114         disable_irq(dev->irq);
1115         i596_interrupt(dev->irq, dev);
1116         enable_irq(dev->irq);
1117 }
1118 #endif
1119
1120 static irqreturn_t i596_interrupt(int irq, void *dev_id)
1121 {
1122         struct net_device *dev = dev_id;
1123         struct i596_private *lp;
1124         struct i596_dma *dma;
1125         unsigned short status, ack_cmd = 0;
1126
1127         lp = netdev_priv(dev);
1128         dma = lp->dma;
1129
1130         spin_lock (&lp->lock);
1131
1132         wait_cmd(dev, dma, 100, "i596 interrupt, timeout");
1133         status = SWAP16(dma->scb.status);
1134
1135         DEB(DEB_INTS, printk(KERN_DEBUG
1136                              "%s: i596 interrupt, IRQ %d, status %4.4x.\n",
1137                         dev->name, dev->irq, status));
1138
1139         ack_cmd = status & 0xf000;
1140
1141         if (!ack_cmd) {
1142                 DEB(DEB_ERRORS, printk(KERN_DEBUG
1143                                        "%s: interrupt with no events\n",
1144                                        dev->name));
1145                 spin_unlock (&lp->lock);
1146                 return IRQ_NONE;
1147         }
1148
1149         if ((status & 0x8000) || (status & 0x2000)) {
1150                 struct i596_cmd *ptr;
1151
1152                 if ((status & 0x8000))
1153                         DEB(DEB_INTS,
1154                             printk(KERN_DEBUG
1155                                    "%s: i596 interrupt completed command.\n",
1156                                    dev->name));
1157                 if ((status & 0x2000))
1158                         DEB(DEB_INTS,
1159                             printk(KERN_DEBUG
1160                                    "%s: i596 interrupt command unit inactive %x.\n",
1161                                    dev->name, status & 0x0700));
1162
1163                 while (lp->cmd_head != NULL) {
1164                         DMA_INV(dev, lp->cmd_head, sizeof(struct i596_cmd));
1165                         if (!(lp->cmd_head->status & SWAP16(STAT_C)))
1166                                 break;
1167
1168                         ptr = lp->cmd_head;
1169
1170                         DEB(DEB_STATUS,
1171                             printk(KERN_DEBUG
1172                                    "cmd_head->status = %04x, ->command = %04x\n",
1173                                    SWAP16(lp->cmd_head->status),
1174                                    SWAP16(lp->cmd_head->command)));
1175                         lp->cmd_head = ptr->v_next;
1176                         lp->cmd_backlog--;
1177
1178                         switch (SWAP16(ptr->command) & 0x7) {
1179                         case CmdTx:
1180                             {
1181                                 struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
1182                                 struct sk_buff *skb = tx_cmd->skb;
1183
1184                                 if (ptr->status & SWAP16(STAT_OK)) {
1185                                         DEB(DEB_TXADDR,
1186                                             print_eth(skb->data, "tx-done"));
1187                                 } else {
1188                                         dev->stats.tx_errors++;
1189                                         if (ptr->status & SWAP16(0x0020))
1190                                                 dev->stats.collisions++;
1191                                         if (!(ptr->status & SWAP16(0x0040)))
1192                                                 dev->stats.tx_heartbeat_errors++;
1193                                         if (ptr->status & SWAP16(0x0400))
1194                                                 dev->stats.tx_carrier_errors++;
1195                                         if (ptr->status & SWAP16(0x0800))
1196                                                 dev->stats.collisions++;
1197                                         if (ptr->status & SWAP16(0x1000))
1198                                                 dev->stats.tx_aborted_errors++;
1199                                 }
1200                                 dma_unmap_single(dev->dev.parent,
1201                                                  tx_cmd->dma_addr,
1202                                                  skb->len, DMA_TO_DEVICE);
1203                                 dev_kfree_skb_irq(skb);
1204
1205                                 tx_cmd->cmd.command = 0; /* Mark free */
1206                                 break;
1207                             }
1208                         case CmdTDR:
1209                             {
1210                                 unsigned short status = SWAP16(((struct tdr_cmd *)ptr)->status);
1211
1212                                 if (status & 0x8000) {
1213                                         DEB(DEB_ANY,
1214                                             printk(KERN_DEBUG "%s: link ok.\n",
1215                                                    dev->name));
1216                                 } else {
1217                                         if (status & 0x4000)
1218                                                 printk(KERN_ERR
1219                                                        "%s: Transceiver problem.\n",
1220                                                        dev->name);
1221                                         if (status & 0x2000)
1222                                                 printk(KERN_ERR
1223                                                        "%s: Termination problem.\n",
1224                                                        dev->name);
1225                                         if (status & 0x1000)
1226                                                 printk(KERN_ERR
1227                                                        "%s: Short circuit.\n",
1228                                                        dev->name);
1229
1230                                         DEB(DEB_TDR,
1231                                             printk(KERN_DEBUG "%s: Time %d.\n",
1232                                                    dev->name, status & 0x07ff));
1233                                 }
1234                                 break;
1235                             }
1236                         case CmdConfigure:
1237                                 /*
1238                                  * Zap command so set_multicast_list() know
1239                                  * it is free
1240                                  */
1241                                 ptr->command = 0;
1242                                 break;
1243                         }
1244                         ptr->v_next = NULL;
1245                         ptr->b_next = I596_NULL;
1246                         DMA_WBACK(dev, ptr, sizeof(struct i596_cmd));
1247                         lp->last_cmd = jiffies;
1248                 }
1249
1250                 /* This mess is arranging that only the last of any outstanding
1251                  * commands has the interrupt bit set.  Should probably really
1252                  * only add to the cmd queue when the CU is stopped.
1253                  */
1254                 ptr = lp->cmd_head;
1255                 while ((ptr != NULL) && (ptr != lp->cmd_tail)) {
1256                         struct i596_cmd *prev = ptr;
1257
1258                         ptr->command &= SWAP16(0x1fff);
1259                         ptr = ptr->v_next;
1260                         DMA_WBACK_INV(dev, prev, sizeof(struct i596_cmd));
1261                 }
1262
1263                 if (lp->cmd_head != NULL)
1264                         ack_cmd |= CUC_START;
1265                 dma->scb.cmd = SWAP32(virt_to_dma(lp, &lp->cmd_head->status));
1266                 DMA_WBACK_INV(dev, &dma->scb, sizeof(struct i596_scb));
1267         }
1268         if ((status & 0x1000) || (status & 0x4000)) {
1269                 if ((status & 0x4000))
1270                         DEB(DEB_INTS,
1271                             printk(KERN_DEBUG
1272                                    "%s: i596 interrupt received a frame.\n",
1273                                    dev->name));
1274                 i596_rx(dev);
1275                 /* Only RX_START if stopped - RGH 07-07-96 */
1276                 if (status & 0x1000) {
1277                         if (netif_running(dev)) {
1278                                 DEB(DEB_ERRORS,
1279                                     printk(KERN_DEBUG
1280                                            "%s: i596 interrupt receive unit inactive, status 0x%x\n",
1281                                            dev->name, status));
1282                                 ack_cmd |= RX_START;
1283                                 dev->stats.rx_errors++;
1284                                 dev->stats.rx_fifo_errors++;
1285                                 rebuild_rx_bufs(dev);
1286                         }
1287                 }
1288         }
1289         wait_cmd(dev, dma, 100, "i596 interrupt, timeout");
1290         dma->scb.command = SWAP16(ack_cmd);
1291         DMA_WBACK(dev, &dma->scb, sizeof(struct i596_scb));
1292
1293         /* DANGER: I suspect that some kind of interrupt
1294          acknowledgement aside from acking the 82596 might be needed
1295          here...  but it's running acceptably without */
1296
1297         ca(dev);
1298
1299         wait_cmd(dev, dma, 100, "i596 interrupt, exit timeout");
1300         DEB(DEB_INTS, printk(KERN_DEBUG "%s: exiting interrupt.\n", dev->name));
1301
1302         spin_unlock (&lp->lock);
1303         return IRQ_HANDLED;
1304 }
1305
1306 static int i596_close(struct net_device *dev)
1307 {
1308         struct i596_private *lp = netdev_priv(dev);
1309         unsigned long flags;
1310
1311         netif_stop_queue(dev);
1312
1313         DEB(DEB_INIT,
1314             printk(KERN_DEBUG
1315                    "%s: Shutting down ethercard, status was %4.4x.\n",
1316                    dev->name, SWAP16(lp->dma->scb.status)));
1317
1318         spin_lock_irqsave(&lp->lock, flags);
1319
1320         wait_cmd(dev, lp->dma, 100, "close1 timed out");
1321         lp->dma->scb.command = SWAP16(CUC_ABORT | RX_ABORT);
1322         DMA_WBACK(dev, &lp->dma->scb, sizeof(struct i596_scb));
1323
1324         ca(dev);
1325
1326         wait_cmd(dev, lp->dma, 100, "close2 timed out");
1327         spin_unlock_irqrestore(&lp->lock, flags);
1328         DEB(DEB_STRUCT, i596_display_data(dev));
1329         i596_cleanup_cmd(dev, lp);
1330
1331         free_irq(dev->irq, dev);
1332         remove_rx_bufs(dev);
1333
1334         return 0;
1335 }
1336
1337 /*
1338  *    Set or clear the multicast filter for this adaptor.
1339  */
1340
1341 static void set_multicast_list(struct net_device *dev)
1342 {
1343         struct i596_private *lp = netdev_priv(dev);
1344         struct i596_dma *dma = lp->dma;
1345         int config = 0, cnt;
1346
1347         DEB(DEB_MULTI,
1348             printk(KERN_DEBUG
1349                    "%s: set multicast list, %d entries, promisc %s, allmulti %s\n",
1350                    dev->name, dev->mc_count,
1351                    dev->flags & IFF_PROMISC ? "ON" : "OFF",
1352                    dev->flags & IFF_ALLMULTI ? "ON" : "OFF"));
1353
1354         if ((dev->flags & IFF_PROMISC) &&
1355             !(dma->cf_cmd.i596_config[8] & 0x01)) {
1356                 dma->cf_cmd.i596_config[8] |= 0x01;
1357                 config = 1;
1358         }
1359         if (!(dev->flags & IFF_PROMISC) &&
1360             (dma->cf_cmd.i596_config[8] & 0x01)) {
1361                 dma->cf_cmd.i596_config[8] &= ~0x01;
1362                 config = 1;
1363         }
1364         if ((dev->flags & IFF_ALLMULTI) &&
1365             (dma->cf_cmd.i596_config[11] & 0x20)) {
1366                 dma->cf_cmd.i596_config[11] &= ~0x20;
1367                 config = 1;
1368         }
1369         if (!(dev->flags & IFF_ALLMULTI) &&
1370             !(dma->cf_cmd.i596_config[11] & 0x20)) {
1371                 dma->cf_cmd.i596_config[11] |= 0x20;
1372                 config = 1;
1373         }
1374         if (config) {
1375                 if (dma->cf_cmd.cmd.command)
1376                         printk(KERN_INFO
1377                                "%s: config change request already queued\n",
1378                                dev->name);
1379                 else {
1380                         dma->cf_cmd.cmd.command = SWAP16(CmdConfigure);
1381                         DMA_WBACK_INV(dev, &dma->cf_cmd, sizeof(struct cf_cmd));
1382                         i596_add_cmd(dev, &dma->cf_cmd.cmd);
1383                 }
1384         }
1385
1386         cnt = dev->mc_count;
1387         if (cnt > MAX_MC_CNT) {
1388                 cnt = MAX_MC_CNT;
1389                 printk(KERN_NOTICE "%s: Only %d multicast addresses supported",
1390                         dev->name, cnt);
1391         }
1392
1393         if (dev->mc_count > 0) {
1394                 struct dev_mc_list *dmi;
1395                 unsigned char *cp;
1396                 struct mc_cmd *cmd;
1397
1398                 cmd = &dma->mc_cmd;
1399                 cmd->cmd.command = SWAP16(CmdMulticastList);
1400                 cmd->mc_cnt = SWAP16(dev->mc_count * 6);
1401                 cp = cmd->mc_addrs;
1402                 for (dmi = dev->mc_list;
1403                      cnt && dmi != NULL;
1404                      dmi = dmi->next, cnt--, cp += 6) {
1405                         memcpy(cp, dmi->dmi_addr, 6);
1406                         if (i596_debug > 1)
1407                                 DEB(DEB_MULTI,
1408                                     printk(KERN_DEBUG
1409                                            "%s: Adding address %pM\n",
1410                                            dev->name, cp));
1411                 }
1412                 DMA_WBACK_INV(dev, &dma->mc_cmd, sizeof(struct mc_cmd));
1413                 i596_add_cmd(dev, &cmd->cmd);
1414         }
1415 }