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    * performance 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;
 474
 475                 skb = netdev_alloc_skb_ip_align(dev, PKT_BUF_SZ);
 476                 if (skb == NULL)
 477                         return -1;
 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_ip_align(dev,
 701                                                                    PKT_BUF_SZ);
 702                                 if (newskb == NULL) {
 703                                         skb = NULL;     /* drop pkt */
 704                                         goto memory_squeeze;
 705                                 }
 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_ip_align(dev, pkt_len);
 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                                         memcpy(skb_put(skb, pkt_len), rbd->v_data, pkt_len);
 734                                         dma_sync_single_for_device(dev->dev.parent,
 735                                                                    (dma_addr_t)SWAP32(rbd->b_data),
 736                                                                    PKT_BUF_SZ, DMA_FROM_DEVICE);
 737                                 }
 738                                 skb->len = pkt_len;
 739                                 skb->protocol = eth_type_trans(skb, dev);
 740                                 netif_rx(skb);
 741                                 dev->stats.rx_packets++;
 742                                 dev->stats.rx_bytes += pkt_len;
 743                         }
 744                 } else {
 745                         DEB(DEB_ERRORS, printk(KERN_DEBUG
 746                                                "%s: Error, rfd.stat = 0x%04x\n",
 747                                                dev->name, rfd->stat));
 748                         dev->stats.rx_errors++;
 749                         if (rfd->stat & SWAP16(0x0100))
 750                                 dev->stats.collisions++;
 751                         if (rfd->stat & SWAP16(0x8000))
 752                                 dev->stats.rx_length_errors++;
 753                         if (rfd->stat & SWAP16(0x0001))
 754                                 dev->stats.rx_over_errors++;
 755                         if (rfd->stat & SWAP16(0x0002))
 756                                 dev->stats.rx_fifo_errors++;
 757                         if (rfd->stat & SWAP16(0x0004))
 758                                 dev->stats.rx_frame_errors++;
 759                         if (rfd->stat & SWAP16(0x0008))
 760                                 dev->stats.rx_crc_errors++;
 761                         if (rfd->stat & SWAP16(0x0010))
 762                                 dev->stats.rx_length_errors++;
 763                 }
 764
 765                 /* Clear the buffer descriptor count and EOF + F flags */
 766
 767                 if (rbd != NULL && (rbd->count & SWAP16(0x4000))) {
 768                         rbd->count = 0;
 769                         lp->rbd_head = rbd->v_next;
 770                         DMA_WBACK_INV(dev, rbd, sizeof(struct i596_rbd));
 771                 }
 772
 773                 /* Tidy the frame descriptor, marking it as end of list */
 774
 775                 rfd->rbd = I596_NULL;
 776                 rfd->stat = 0;
 777                 rfd->cmd = SWAP16(CMD_EOL|CMD_FLEX);
 778                 rfd->count = 0;
 779
 780                 /* Update record of next frame descriptor to process */
 781
 782                 lp->dma->scb.rfd = rfd->b_next;
 783                 lp->rfd_head = rfd->v_next;
 784                 DMA_WBACK_INV(dev, rfd, sizeof(struct i596_rfd));
 785
 786                 /* Remove end-of-list from old end descriptor */
 787
 788                 rfd->v_prev->cmd = SWAP16(CMD_FLEX);
 789                 DMA_WBACK_INV(dev, rfd->v_prev, sizeof(struct i596_rfd));
 790                 rfd = lp->rfd_head;
 791                 DMA_INV(dev, rfd, sizeof(struct i596_rfd));
 792         }
 793
 794         DEB(DEB_RXFRAME, printk(KERN_DEBUG "frames %d\n", frames));
 795
 796         return 0;
 797 }
 798
 799
 800 static inline void i596_cleanup_cmd(struct net_device *dev, struct i596_private *lp)
 801 {
 802         struct i596_cmd *ptr;
 803
 804         while (lp->cmd_head != NULL) {
 805                 ptr = lp->cmd_head;
 806                 lp->cmd_head = ptr->v_next;
 807                 lp->cmd_backlog--;
 808
 809                 switch (SWAP16(ptr->command) & 0x7) {
 810                 case CmdTx:
 811                         {
 812                                 struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
 813                                 struct sk_buff *skb = tx_cmd->skb;
 814                                 dma_unmap_single(dev->dev.parent,
 815                                                  tx_cmd->dma_addr,
 816                                                  skb->len, DMA_TO_DEVICE);
 817
 818                                 dev_kfree_skb(skb);
 819
 820                                 dev->stats.tx_errors++;
 821                                 dev->stats.tx_aborted_errors++;
 822
 823                                 ptr->v_next = NULL;
 824                                 ptr->b_next = I596_NULL;
 825                                 tx_cmd->cmd.command = 0;  /* Mark as free */
 826                                 break;
 827                         }
 828                 default:
 829                         ptr->v_next = NULL;
 830                         ptr->b_next = I596_NULL;
 831                 }
 832                 DMA_WBACK_INV(dev, ptr, sizeof(struct i596_cmd));
 833         }
 834
 835         wait_cmd(dev, lp->dma, 100, "i596_cleanup_cmd timed out");
 836         lp->dma->scb.cmd = I596_NULL;
 837         DMA_WBACK(dev, &(lp->dma->scb), sizeof(struct i596_scb));
 838 }
 839
 840
 841 static inline void i596_reset(struct net_device *dev, struct i596_private *lp)
 842 {
 843         unsigned long flags;
 844
 845         DEB(DEB_RESET, printk(KERN_DEBUG "i596_reset\n"));
 846
 847         spin_lock_irqsave (&lp->lock, flags);
 848
 849         wait_cmd(dev, lp->dma, 100, "i596_reset timed out");
 850
 851         netif_stop_queue(dev);
 852
 853         /* FIXME: this command might cause an lpmc */
 854         lp->dma->scb.command = SWAP16(CUC_ABORT | RX_ABORT);
 855         DMA_WBACK(dev, &(lp->dma->scb), sizeof(struct i596_scb));
 856         ca(dev);
 857
 858         /* wait for shutdown */
 859         wait_cmd(dev, lp->dma, 1000, "i596_reset 2 timed out");
 860         spin_unlock_irqrestore (&lp->lock, flags);
 861
 862         i596_cleanup_cmd(dev, lp);
 863         i596_rx(dev);
 864
 865         netif_start_queue(dev);
 866         init_i596_mem(dev);
 867 }
 868
 869
 870 static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd)
 871 {
 872         struct i596_private *lp = netdev_priv(dev);
 873         struct i596_dma *dma = lp->dma;
 874         unsigned long flags;
 875
 876         DEB(DEB_ADDCMD, printk(KERN_DEBUG "i596_add_cmd cmd_head %p\n",
 877                                lp->cmd_head));
 878
 879         cmd->status = 0;
 880         cmd->command |= SWAP16(CMD_EOL | CMD_INTR);
 881         cmd->v_next = NULL;
 882         cmd->b_next = I596_NULL;
 883         DMA_WBACK(dev, cmd, sizeof(struct i596_cmd));
 884
 885         spin_lock_irqsave (&lp->lock, flags);
 886
 887         if (lp->cmd_head != NULL) {
 888                 lp->cmd_tail->v_next = cmd;
 889                 lp->cmd_tail->b_next = SWAP32(virt_to_dma(lp, &cmd->status));
 890                 DMA_WBACK(dev, lp->cmd_tail, sizeof(struct i596_cmd));
 891         } else {
 892                 lp->cmd_head = cmd;
 893                 wait_cmd(dev, dma, 100, "i596_add_cmd timed out");
 894                 dma->scb.cmd = SWAP32(virt_to_dma(lp, &cmd->status));
 895                 dma->scb.command = SWAP16(CUC_START);
 896                 DMA_WBACK(dev, &(dma->scb), sizeof(struct i596_scb));
 897                 ca(dev);
 898         }
 899         lp->cmd_tail = cmd;
 900         lp->cmd_backlog++;
 901
 902         spin_unlock_irqrestore (&lp->lock, flags);
 903
 904         if (lp->cmd_backlog > max_cmd_backlog) {
 905                 unsigned long tickssofar = jiffies - lp->last_cmd;
 906
 907                 if (tickssofar < ticks_limit)
 908                         return;
 909
 910                 printk(KERN_ERR
 911                        "%s: command unit timed out, status resetting.\n",
 912                        dev->name);
 913 #if 1
 914                 i596_reset(dev, lp);
 915 #endif
 916         }
 917 }
 918
 919 static int i596_open(struct net_device *dev)
 920 {
 921         DEB(DEB_OPEN, printk(KERN_DEBUG
 922                              "%s: i596_open() irq %d.\n", dev->name, dev->irq));
 923
 924         if (init_rx_bufs(dev)) {
 925                 printk(KERN_ERR "%s: Failed to init rx bufs\n", dev->name);
 926                 return -EAGAIN;
 927         }
 928         if (init_i596_mem(dev)) {
 929                 printk(KERN_ERR "%s: Failed to init memory\n", dev->name);
 930                 goto out_remove_rx_bufs;
 931         }
 932         netif_start_queue(dev);
 933
 934         return 0;
 935
 936 out_remove_rx_bufs:
 937         remove_rx_bufs(dev);
 938         return -EAGAIN;
 939 }
 940
 941 static void i596_tx_timeout (struct net_device *dev)
 942 {
 943         struct i596_private *lp = netdev_priv(dev);
 944
 945         /* Transmitter timeout, serious problems. */
 946         DEB(DEB_ERRORS, printk(KERN_DEBUG
 947                                "%s: transmit timed out, status resetting.\n",
 948                                dev->name));
 949
 950         dev->stats.tx_errors++;
 951
 952         /* Try to restart the adaptor */
 953         if (lp->last_restart == dev->stats.tx_packets) {
 954                 DEB(DEB_ERRORS, printk(KERN_DEBUG "Resetting board.\n"));
 955                 /* Shutdown and restart */
 956                 i596_reset (dev, lp);
 957         } else {
 958                 /* Issue a channel attention signal */
 959                 DEB(DEB_ERRORS, printk(KERN_DEBUG "Kicking board.\n"));
 960                 lp->dma->scb.command = SWAP16(CUC_START | RX_START);
 961                 DMA_WBACK_INV(dev, &(lp->dma->scb), sizeof(struct i596_scb));
 962                 ca (dev);
 963                 lp->last_restart = dev->stats.tx_packets;
 964         }
 965
 966         dev->trans_start = jiffies;
 967         netif_wake_queue (dev);
 968 }
 969
 970
 971 static int i596_start_xmit(struct sk_buff *skb, struct net_device *dev)
 972 {
 973         struct i596_private *lp = netdev_priv(dev);
 974         struct tx_cmd *tx_cmd;
 975         struct i596_tbd *tbd;
 976         short length = skb->len;
 977         dev->trans_start = jiffies;
 978
 979         DEB(DEB_STARTTX, printk(KERN_DEBUG
 980                                 "%s: i596_start_xmit(%x,%p) called\n",
 981                                 dev->name, skb->len, skb->data));
 982
 983         if (length < ETH_ZLEN) {
 984                 if (skb_padto(skb, ETH_ZLEN))
 985                         return NETDEV_TX_OK;
 986                 length = ETH_ZLEN;
 987         }
 988
 989         netif_stop_queue(dev);
 990
 991         tx_cmd = lp->dma->tx_cmds + lp->next_tx_cmd;
 992         tbd = lp->dma->tbds + lp->next_tx_cmd;
 993
 994         if (tx_cmd->cmd.command) {
 995                 DEB(DEB_ERRORS, printk(KERN_DEBUG
 996                                        "%s: xmit ring full, dropping packet.\n",
 997                                        dev->name));
 998                 dev->stats.tx_dropped++;
 999
1000                 dev_kfree_skb(skb);
1001         } else {
1002                 if (++lp->next_tx_cmd == TX_RING_SIZE)
1003                         lp->next_tx_cmd = 0;
1004                 tx_cmd->tbd = SWAP32(virt_to_dma(lp, tbd));
1005                 tbd->next = I596_NULL;
1006
1007                 tx_cmd->cmd.command = SWAP16(CMD_FLEX | CmdTx);
1008                 tx_cmd->skb = skb;
1009
1010                 tx_cmd->pad = 0;
1011                 tx_cmd->size = 0;
1012                 tbd->pad = 0;
1013                 tbd->size = SWAP16(EOF | length);
1014
1015                 tx_cmd->dma_addr = dma_map_single(dev->dev.parent, skb->data,
1016                                                   skb->len, DMA_TO_DEVICE);
1017                 tbd->data = SWAP32(tx_cmd->dma_addr);
1018
1019                 DEB(DEB_TXADDR, print_eth(skb->data, "tx-queued"));
1020                 DMA_WBACK_INV(dev, tx_cmd, sizeof(struct tx_cmd));
1021                 DMA_WBACK_INV(dev, tbd, sizeof(struct i596_tbd));
1022                 i596_add_cmd(dev, &tx_cmd->cmd);
1023
1024                 dev->stats.tx_packets++;
1025                 dev->stats.tx_bytes += length;
1026         }
1027
1028         netif_start_queue(dev);
1029
1030         return NETDEV_TX_OK;
1031 }
1032
1033 static void print_eth(unsigned char *add, char *str)
1034 {
1035         printk(KERN_DEBUG "i596 0x%p, %pM --> %pM %02X%02X, %s\n",
1036                add, add + 6, add, add[12], add[13], str);
1037 }
1038 static const struct net_device_ops i596_netdev_ops = {
1039         .ndo_open               = i596_open,
1040         .ndo_stop               = i596_close,
1041         .ndo_start_xmit         = i596_start_xmit,
1042         .ndo_set_multicast_list = set_multicast_list,
1043         .ndo_tx_timeout         = i596_tx_timeout,
1044         .ndo_change_mtu         = eth_change_mtu,
1045         .ndo_validate_addr      = eth_validate_addr,
1046         .ndo_set_mac_address    = eth_mac_addr,
1047 #ifdef CONFIG_NET_POLL_CONTROLLER
1048         .ndo_poll_controller    = i596_poll_controller,
1049 #endif
1050 };
1051
1052 static int __devinit i82596_probe(struct net_device *dev)
1053 {
1054         int i;
1055         struct i596_private *lp = netdev_priv(dev);
1056         struct i596_dma *dma;
1057
1058         /* This lot is ensure things have been cache line aligned. */
1059         BUILD_BUG_ON(sizeof(struct i596_rfd) != 32);
1060         BUILD_BUG_ON(sizeof(struct i596_rbd) &  31);
1061         BUILD_BUG_ON(sizeof(struct tx_cmd)   &  31);
1062         BUILD_BUG_ON(sizeof(struct i596_tbd) != 32);
1063 #ifndef __LP64__
1064         BUILD_BUG_ON(sizeof(struct i596_dma) > 4096);
1065 #endif
1066
1067         if (!dev->base_addr || !dev->irq)
1068                 return -ENODEV;
1069
1070         dma = (struct i596_dma *) DMA_ALLOC(dev->dev.parent,
1071                 sizeof(struct i596_dma), &lp->dma_addr, GFP_KERNEL);
1072         if (!dma) {
1073                 printk(KERN_ERR "%s: Couldn't get shared memory\n", __FILE__);
1074                 return -ENOMEM;
1075         }
1076
1077         dev->netdev_ops = &i596_netdev_ops;
1078         dev->watchdog_timeo = TX_TIMEOUT;
1079
1080         memset(dma, 0, sizeof(struct i596_dma));
1081         lp->dma = dma;
1082
1083         dma->scb.command = 0;
1084         dma->scb.cmd = I596_NULL;
1085         dma->scb.rfd = I596_NULL;
1086         spin_lock_init(&lp->lock);
1087
1088         DMA_WBACK_INV(dev, dma, sizeof(struct i596_dma));
1089
1090         i = register_netdev(dev);
1091         if (i) {
1092                 DMA_FREE(dev->dev.parent, sizeof(struct i596_dma),
1093                                     (void *)dma, lp->dma_addr);
1094                 return i;
1095         };
1096
1097         DEB(DEB_PROBE, printk(KERN_INFO "%s: 82596 at %#3lx, %pM IRQ %d.\n",
1098                               dev->name, dev->base_addr, dev->dev_addr,
1099                               dev->irq));
1100         DEB(DEB_INIT, printk(KERN_INFO
1101                              "%s: dma at 0x%p (%d bytes), lp->scb at 0x%p\n",
1102                              dev->name, dma, (int)sizeof(struct i596_dma),
1103                              &dma->scb));
1104
1105         return 0;
1106 }
1107
1108 #ifdef CONFIG_NET_POLL_CONTROLLER
1109 static void i596_poll_controller(struct net_device *dev)
1110 {
1111         disable_irq(dev->irq);
1112         i596_interrupt(dev->irq, dev);
1113         enable_irq(dev->irq);
1114 }
1115 #endif
1116
1117 static irqreturn_t i596_interrupt(int irq, void *dev_id)
1118 {
1119         struct net_device *dev = dev_id;
1120         struct i596_private *lp;
1121         struct i596_dma *dma;
1122         unsigned short status, ack_cmd = 0;
1123
1124         lp = netdev_priv(dev);
1125         dma = lp->dma;
1126
1127         spin_lock (&lp->lock);
1128
1129         wait_cmd(dev, dma, 100, "i596 interrupt, timeout");
1130         status = SWAP16(dma->scb.status);
1131
1132         DEB(DEB_INTS, printk(KERN_DEBUG
1133                              "%s: i596 interrupt, IRQ %d, status %4.4x.\n",
1134                         dev->name, dev->irq, status));
1135
1136         ack_cmd = status & 0xf000;
1137
1138         if (!ack_cmd) {
1139                 DEB(DEB_ERRORS, printk(KERN_DEBUG
1140                                        "%s: interrupt with no events\n",
1141                                        dev->name));
1142                 spin_unlock (&lp->lock);
1143                 return IRQ_NONE;
1144         }
1145
1146         if ((status & 0x8000) || (status & 0x2000)) {
1147                 struct i596_cmd *ptr;
1148
1149                 if ((status & 0x8000))
1150                         DEB(DEB_INTS,
1151                             printk(KERN_DEBUG
1152                                    "%s: i596 interrupt completed command.\n",
1153                                    dev->name));
1154                 if ((status & 0x2000))
1155                         DEB(DEB_INTS,
1156                             printk(KERN_DEBUG
1157                                    "%s: i596 interrupt command unit inactive %x.\n",
1158                                    dev->name, status & 0x0700));
1159
1160                 while (lp->cmd_head != NULL) {
1161                         DMA_INV(dev, lp->cmd_head, sizeof(struct i596_cmd));
1162                         if (!(lp->cmd_head->status & SWAP16(STAT_C)))
1163                                 break;
1164
1165                         ptr = lp->cmd_head;
1166
1167                         DEB(DEB_STATUS,
1168                             printk(KERN_DEBUG
1169                                    "cmd_head->status = %04x, ->command = %04x\n",
1170                                    SWAP16(lp->cmd_head->status),
1171                                    SWAP16(lp->cmd_head->command)));
1172                         lp->cmd_head = ptr->v_next;
1173                         lp->cmd_backlog--;
1174
1175                         switch (SWAP16(ptr->command) & 0x7) {
1176                         case CmdTx:
1177                             {
1178                                 struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
1179                                 struct sk_buff *skb = tx_cmd->skb;
1180
1181                                 if (ptr->status & SWAP16(STAT_OK)) {
1182                                         DEB(DEB_TXADDR,
1183                                             print_eth(skb->data, "tx-done"));
1184                                 } else {
1185                                         dev->stats.tx_errors++;
1186                                         if (ptr->status & SWAP16(0x0020))
1187                                                 dev->stats.collisions++;
1188                                         if (!(ptr->status & SWAP16(0x0040)))
1189                                                 dev->stats.tx_heartbeat_errors++;
1190                                         if (ptr->status & SWAP16(0x0400))
1191                                                 dev->stats.tx_carrier_errors++;
1192                                         if (ptr->status & SWAP16(0x0800))
1193                                                 dev->stats.collisions++;
1194                                         if (ptr->status & SWAP16(0x1000))
1195                                                 dev->stats.tx_aborted_errors++;
1196                                 }
1197                                 dma_unmap_single(dev->dev.parent,
1198                                                  tx_cmd->dma_addr,
1199                                                  skb->len, DMA_TO_DEVICE);
1200                                 dev_kfree_skb_irq(skb);
1201
1202                                 tx_cmd->cmd.command = 0; /* Mark free */
1203                                 break;
1204                             }
1205                         case CmdTDR:
1206                             {
1207                                 unsigned short status = SWAP16(((struct tdr_cmd *)ptr)->status);
1208
1209                                 if (status & 0x8000) {
1210                                         DEB(DEB_ANY,
1211                                             printk(KERN_DEBUG "%s: link ok.\n",
1212                                                    dev->name));
1213                                 } else {
1214                                         if (status & 0x4000)
1215                                                 printk(KERN_ERR
1216                                                        "%s: Transceiver problem.\n",
1217                                                        dev->name);
1218                                         if (status & 0x2000)
1219                                                 printk(KERN_ERR
1220                                                        "%s: Termination problem.\n",
1221                                                        dev->name);
1222                                         if (status & 0x1000)
1223                                                 printk(KERN_ERR
1224                                                        "%s: Short circuit.\n",
1225                                                        dev->name);
1226
1227                                         DEB(DEB_TDR,
1228                                             printk(KERN_DEBUG "%s: Time %d.\n",
1229                                                    dev->name, status & 0x07ff));
1230                                 }
1231                                 break;
1232                             }
1233                         case CmdConfigure:
1234                                 /*
1235                                  * Zap command so set_multicast_list() know
1236                                  * it is free
1237                                  */
1238                                 ptr->command = 0;
1239                                 break;
1240                         }
1241                         ptr->v_next = NULL;
1242                         ptr->b_next = I596_NULL;
1243                         DMA_WBACK(dev, ptr, sizeof(struct i596_cmd));
1244                         lp->last_cmd = jiffies;
1245                 }
1246
1247                 /* This mess is arranging that only the last of any outstanding
1248                  * commands has the interrupt bit set.  Should probably really
1249                  * only add to the cmd queue when the CU is stopped.
1250                  */
1251                 ptr = lp->cmd_head;
1252                 while ((ptr != NULL) && (ptr != lp->cmd_tail)) {
1253                         struct i596_cmd *prev = ptr;
1254
1255                         ptr->command &= SWAP16(0x1fff);
1256                         ptr = ptr->v_next;
1257                         DMA_WBACK_INV(dev, prev, sizeof(struct i596_cmd));
1258                 }
1259
1260                 if (lp->cmd_head != NULL)
1261                         ack_cmd |= CUC_START;
1262                 dma->scb.cmd = SWAP32(virt_to_dma(lp, &lp->cmd_head->status));
1263                 DMA_WBACK_INV(dev, &dma->scb, sizeof(struct i596_scb));
1264         }
1265         if ((status & 0x1000) || (status & 0x4000)) {
1266                 if ((status & 0x4000))
1267                         DEB(DEB_INTS,
1268                             printk(KERN_DEBUG
1269                                    "%s: i596 interrupt received a frame.\n",
1270                                    dev->name));
1271                 i596_rx(dev);
1272                 /* Only RX_START if stopped - RGH 07-07-96 */
1273                 if (status & 0x1000) {
1274                         if (netif_running(dev)) {
1275                                 DEB(DEB_ERRORS,
1276                                     printk(KERN_DEBUG
1277                                            "%s: i596 interrupt receive unit inactive, status 0x%x\n",
1278                                            dev->name, status));
1279                                 ack_cmd |= RX_START;
1280                                 dev->stats.rx_errors++;
1281                                 dev->stats.rx_fifo_errors++;
1282                                 rebuild_rx_bufs(dev);
1283                         }
1284                 }
1285         }
1286         wait_cmd(dev, dma, 100, "i596 interrupt, timeout");
1287         dma->scb.command = SWAP16(ack_cmd);
1288         DMA_WBACK(dev, &dma->scb, sizeof(struct i596_scb));
1289
1290         /* DANGER: I suspect that some kind of interrupt
1291          acknowledgement aside from acking the 82596 might be needed
1292          here...  but it's running acceptably without */
1293
1294         ca(dev);
1295
1296         wait_cmd(dev, dma, 100, "i596 interrupt, exit timeout");
1297         DEB(DEB_INTS, printk(KERN_DEBUG "%s: exiting interrupt.\n", dev->name));
1298
1299         spin_unlock (&lp->lock);
1300         return IRQ_HANDLED;
1301 }
1302
1303 static int i596_close(struct net_device *dev)
1304 {
1305         struct i596_private *lp = netdev_priv(dev);
1306         unsigned long flags;
1307
1308         netif_stop_queue(dev);
1309
1310         DEB(DEB_INIT,
1311             printk(KERN_DEBUG
1312                    "%s: Shutting down ethercard, status was %4.4x.\n",
1313                    dev->name, SWAP16(lp->dma->scb.status)));
1314
1315         spin_lock_irqsave(&lp->lock, flags);
1316
1317         wait_cmd(dev, lp->dma, 100, "close1 timed out");
1318         lp->dma->scb.command = SWAP16(CUC_ABORT | RX_ABORT);
1319         DMA_WBACK(dev, &lp->dma->scb, sizeof(struct i596_scb));
1320
1321         ca(dev);
1322
1323         wait_cmd(dev, lp->dma, 100, "close2 timed out");
1324         spin_unlock_irqrestore(&lp->lock, flags);
1325         DEB(DEB_STRUCT, i596_display_data(dev));
1326         i596_cleanup_cmd(dev, lp);
1327
1328         free_irq(dev->irq, dev);
1329         remove_rx_bufs(dev);
1330
1331         return 0;
1332 }
1333
1334 /*
1335  *    Set or clear the multicast filter for this adaptor.
1336  */
1337
1338 static void set_multicast_list(struct net_device *dev)
1339 {
1340         struct i596_private *lp = netdev_priv(dev);
1341         struct i596_dma *dma = lp->dma;
1342         int config = 0, cnt;
1343
1344         DEB(DEB_MULTI,
1345             printk(KERN_DEBUG
1346                    "%s: set multicast list, %d entries, promisc %s, allmulti %s\n",
1347                    dev->name, dev->mc_count,
1348                    dev->flags & IFF_PROMISC ? "ON" : "OFF",
1349                    dev->flags & IFF_ALLMULTI ? "ON" : "OFF"));
1350
1351         if ((dev->flags & IFF_PROMISC) &&
1352             !(dma->cf_cmd.i596_config[8] & 0x01)) {
1353                 dma->cf_cmd.i596_config[8] |= 0x01;
1354                 config = 1;
1355         }
1356         if (!(dev->flags & IFF_PROMISC) &&
1357             (dma->cf_cmd.i596_config[8] & 0x01)) {
1358                 dma->cf_cmd.i596_config[8] &= ~0x01;
1359                 config = 1;
1360         }
1361         if ((dev->flags & IFF_ALLMULTI) &&
1362             (dma->cf_cmd.i596_config[11] & 0x20)) {
1363                 dma->cf_cmd.i596_config[11] &= ~0x20;
1364                 config = 1;
1365         }
1366         if (!(dev->flags & IFF_ALLMULTI) &&
1367             !(dma->cf_cmd.i596_config[11] & 0x20)) {
1368                 dma->cf_cmd.i596_config[11] |= 0x20;
1369                 config = 1;
1370         }
1371         if (config) {
1372                 if (dma->cf_cmd.cmd.command)
1373                         printk(KERN_INFO
1374                                "%s: config change request already queued\n",
1375                                dev->name);
1376                 else {
1377                         dma->cf_cmd.cmd.command = SWAP16(CmdConfigure);
1378                         DMA_WBACK_INV(dev, &dma->cf_cmd, sizeof(struct cf_cmd));
1379                         i596_add_cmd(dev, &dma->cf_cmd.cmd);
1380                 }
1381         }
1382
1383         cnt = netdev_mc_count(dev);
1384         if (cnt > MAX_MC_CNT) {
1385                 cnt = MAX_MC_CNT;
1386                 printk(KERN_NOTICE "%s: Only %d multicast addresses supported",
1387                         dev->name, cnt);
1388         }
1389
1390         if (!netdev_mc_empty(dev)) {
1391                 struct dev_mc_list *dmi;
1392                 unsigned char *cp;
1393                 struct mc_cmd *cmd;
1394
1395                 cmd = &dma->mc_cmd;
1396                 cmd->cmd.command = SWAP16(CmdMulticastList);
1397                 cmd->mc_cnt = SWAP16(netdev_mc_count(dev) * 6);
1398                 cp = cmd->mc_addrs;
1399                 netdev_for_each_mc_addr(dmi, dev) {
1400                         if (!cnt--)
1401                                 break;
1402                         memcpy(cp, dmi->dmi_addr, 6);
1403                         if (i596_debug > 1)
1404                                 DEB(DEB_MULTI,
1405                                     printk(KERN_DEBUG
1406                                            "%s: Adding address %pM\n",
1407                                            dev->name, cp));
1408                         cp += 6;
1409                 }
1410                 DMA_WBACK_INV(dev, &dma->mc_cmd, sizeof(struct mc_cmd));
1411                 i596_add_cmd(dev, &cmd->cmd);
1412         }
1413 }