ACPI: Add the reference count to avoid unloading ACPI video bus twice
[linux-2.6.git] / 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
1040 static int __devinit i82596_probe(struct net_device *dev)
1041 {
1042         int i;
1043         struct i596_private *lp = netdev_priv(dev);
1044         struct i596_dma *dma;
1045
1046         /* This lot is ensure things have been cache line aligned. */
1047         BUILD_BUG_ON(sizeof(struct i596_rfd) != 32);
1048         BUILD_BUG_ON(sizeof(struct i596_rbd) &  31);
1049         BUILD_BUG_ON(sizeof(struct tx_cmd)   &  31);
1050         BUILD_BUG_ON(sizeof(struct i596_tbd) != 32);
1051 #ifndef __LP64__
1052         BUILD_BUG_ON(sizeof(struct i596_dma) > 4096);
1053 #endif
1054
1055         if (!dev->base_addr || !dev->irq)
1056                 return -ENODEV;
1057
1058         dma = (struct i596_dma *) DMA_ALLOC(dev->dev.parent,
1059                 sizeof(struct i596_dma), &lp->dma_addr, GFP_KERNEL);
1060         if (!dma) {
1061                 printk(KERN_ERR "%s: Couldn't get shared memory\n", __FILE__);
1062                 return -ENOMEM;
1063         }
1064
1065         /* The 82596-specific entries in the device structure. */
1066         dev->open = i596_open;
1067         dev->stop = i596_close;
1068         dev->hard_start_xmit = i596_start_xmit;
1069         dev->set_multicast_list = set_multicast_list;
1070         dev->tx_timeout = i596_tx_timeout;
1071         dev->watchdog_timeo = TX_TIMEOUT;
1072 #ifdef CONFIG_NET_POLL_CONTROLLER
1073         dev->poll_controller = i596_poll_controller;
1074 #endif
1075
1076         memset(dma, 0, sizeof(struct i596_dma));
1077         lp->dma = dma;
1078
1079         dma->scb.command = 0;
1080         dma->scb.cmd = I596_NULL;
1081         dma->scb.rfd = I596_NULL;
1082         spin_lock_init(&lp->lock);
1083
1084         DMA_WBACK_INV(dev, dma, sizeof(struct i596_dma));
1085
1086         i = register_netdev(dev);
1087         if (i) {
1088                 DMA_FREE(dev->dev.parent, sizeof(struct i596_dma),
1089                                     (void *)dma, lp->dma_addr);
1090                 return i;
1091         };
1092
1093         DEB(DEB_PROBE, printk(KERN_INFO "%s: 82596 at %#3lx,",
1094                               dev->name, dev->base_addr));
1095         for (i = 0; i < 6; i++)
1096                 DEB(DEB_PROBE, printk(" %2.2X", dev->dev_addr[i]));
1097         DEB(DEB_PROBE, printk(" IRQ %d.\n", dev->irq));
1098         DEB(DEB_INIT, printk(KERN_INFO
1099                              "%s: dma at 0x%p (%d bytes), lp->scb at 0x%p\n",
1100                              dev->name, dma, (int)sizeof(struct i596_dma),
1101                              &dma->scb));
1102
1103         return 0;
1104 }
1105
1106 #ifdef CONFIG_NET_POLL_CONTROLLER
1107 static void i596_poll_controller(struct net_device *dev)
1108 {
1109         disable_irq(dev->irq);
1110         i596_interrupt(dev->irq, dev);
1111         enable_irq(dev->irq);
1112 }
1113 #endif
1114
1115 static irqreturn_t i596_interrupt(int irq, void *dev_id)
1116 {
1117         struct net_device *dev = dev_id;
1118         struct i596_private *lp;
1119         struct i596_dma *dma;
1120         unsigned short status, ack_cmd = 0;
1121
1122         lp = netdev_priv(dev);
1123         dma = lp->dma;
1124
1125         spin_lock (&lp->lock);
1126
1127         wait_cmd(dev, dma, 100, "i596 interrupt, timeout");
1128         status = SWAP16(dma->scb.status);
1129
1130         DEB(DEB_INTS, printk(KERN_DEBUG
1131                              "%s: i596 interrupt, IRQ %d, status %4.4x.\n",
1132                         dev->name, dev->irq, status));
1133
1134         ack_cmd = status & 0xf000;
1135
1136         if (!ack_cmd) {
1137                 DEB(DEB_ERRORS, printk(KERN_DEBUG
1138                                        "%s: interrupt with no events\n",
1139                                        dev->name));
1140                 spin_unlock (&lp->lock);
1141                 return IRQ_NONE;
1142         }
1143
1144         if ((status & 0x8000) || (status & 0x2000)) {
1145                 struct i596_cmd *ptr;
1146
1147                 if ((status & 0x8000))
1148                         DEB(DEB_INTS,
1149                             printk(KERN_DEBUG
1150                                    "%s: i596 interrupt completed command.\n",
1151                                    dev->name));
1152                 if ((status & 0x2000))
1153                         DEB(DEB_INTS,
1154                             printk(KERN_DEBUG
1155                                    "%s: i596 interrupt command unit inactive %x.\n",
1156                                    dev->name, status & 0x0700));
1157
1158                 while (lp->cmd_head != NULL) {
1159                         DMA_INV(dev, lp->cmd_head, sizeof(struct i596_cmd));
1160                         if (!(lp->cmd_head->status & SWAP16(STAT_C)))
1161                                 break;
1162
1163                         ptr = lp->cmd_head;
1164
1165                         DEB(DEB_STATUS,
1166                             printk(KERN_DEBUG
1167                                    "cmd_head->status = %04x, ->command = %04x\n",
1168                                    SWAP16(lp->cmd_head->status),
1169                                    SWAP16(lp->cmd_head->command)));
1170                         lp->cmd_head = ptr->v_next;
1171                         lp->cmd_backlog--;
1172
1173                         switch (SWAP16(ptr->command) & 0x7) {
1174                         case CmdTx:
1175                             {
1176                                 struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
1177                                 struct sk_buff *skb = tx_cmd->skb;
1178
1179                                 if (ptr->status & SWAP16(STAT_OK)) {
1180                                         DEB(DEB_TXADDR,
1181                                             print_eth(skb->data, "tx-done"));
1182                                 } else {
1183                                         dev->stats.tx_errors++;
1184                                         if (ptr->status & SWAP16(0x0020))
1185                                                 dev->stats.collisions++;
1186                                         if (!(ptr->status & SWAP16(0x0040)))
1187                                                 dev->stats.tx_heartbeat_errors++;
1188                                         if (ptr->status & SWAP16(0x0400))
1189                                                 dev->stats.tx_carrier_errors++;
1190                                         if (ptr->status & SWAP16(0x0800))
1191                                                 dev->stats.collisions++;
1192                                         if (ptr->status & SWAP16(0x1000))
1193                                                 dev->stats.tx_aborted_errors++;
1194                                 }
1195                                 dma_unmap_single(dev->dev.parent,
1196                                                  tx_cmd->dma_addr,
1197                                                  skb->len, DMA_TO_DEVICE);
1198                                 dev_kfree_skb_irq(skb);
1199
1200                                 tx_cmd->cmd.command = 0; /* Mark free */
1201                                 break;
1202                             }
1203                         case CmdTDR:
1204                             {
1205                                 unsigned short status = SWAP16(((struct tdr_cmd *)ptr)->status);
1206
1207                                 if (status & 0x8000) {
1208                                         DEB(DEB_ANY,
1209                                             printk(KERN_DEBUG "%s: link ok.\n",
1210                                                    dev->name));
1211                                 } else {
1212                                         if (status & 0x4000)
1213                                                 printk(KERN_ERR
1214                                                        "%s: Transceiver problem.\n",
1215                                                        dev->name);
1216                                         if (status & 0x2000)
1217                                                 printk(KERN_ERR
1218                                                        "%s: Termination problem.\n",
1219                                                        dev->name);
1220                                         if (status & 0x1000)
1221                                                 printk(KERN_ERR
1222                                                        "%s: Short circuit.\n",
1223                                                        dev->name);
1224
1225                                         DEB(DEB_TDR,
1226                                             printk(KERN_DEBUG "%s: Time %d.\n",
1227                                                    dev->name, status & 0x07ff));
1228                                 }
1229                                 break;
1230                             }
1231                         case CmdConfigure:
1232                                 /*
1233                                  * Zap command so set_multicast_list() know
1234                                  * it is free
1235                                  */
1236                                 ptr->command = 0;
1237                                 break;
1238                         }
1239                         ptr->v_next = NULL;
1240                         ptr->b_next = I596_NULL;
1241                         DMA_WBACK(dev, ptr, sizeof(struct i596_cmd));
1242                         lp->last_cmd = jiffies;
1243                 }
1244
1245                 /* This mess is arranging that only the last of any outstanding
1246                  * commands has the interrupt bit set.  Should probably really
1247                  * only add to the cmd queue when the CU is stopped.
1248                  */
1249                 ptr = lp->cmd_head;
1250                 while ((ptr != NULL) && (ptr != lp->cmd_tail)) {
1251                         struct i596_cmd *prev = ptr;
1252
1253                         ptr->command &= SWAP16(0x1fff);
1254                         ptr = ptr->v_next;
1255                         DMA_WBACK_INV(dev, prev, sizeof(struct i596_cmd));
1256                 }
1257
1258                 if (lp->cmd_head != NULL)
1259                         ack_cmd |= CUC_START;
1260                 dma->scb.cmd = SWAP32(virt_to_dma(lp, &lp->cmd_head->status));
1261                 DMA_WBACK_INV(dev, &dma->scb, sizeof(struct i596_scb));
1262         }
1263         if ((status & 0x1000) || (status & 0x4000)) {
1264                 if ((status & 0x4000))
1265                         DEB(DEB_INTS,
1266                             printk(KERN_DEBUG
1267                                    "%s: i596 interrupt received a frame.\n",
1268                                    dev->name));
1269                 i596_rx(dev);
1270                 /* Only RX_START if stopped - RGH 07-07-96 */
1271                 if (status & 0x1000) {
1272                         if (netif_running(dev)) {
1273                                 DEB(DEB_ERRORS,
1274                                     printk(KERN_DEBUG
1275                                            "%s: i596 interrupt receive unit inactive, status 0x%x\n",
1276                                            dev->name, status));
1277                                 ack_cmd |= RX_START;
1278                                 dev->stats.rx_errors++;
1279                                 dev->stats.rx_fifo_errors++;
1280                                 rebuild_rx_bufs(dev);
1281                         }
1282                 }
1283         }
1284         wait_cmd(dev, dma, 100, "i596 interrupt, timeout");
1285         dma->scb.command = SWAP16(ack_cmd);
1286         DMA_WBACK(dev, &dma->scb, sizeof(struct i596_scb));
1287
1288         /* DANGER: I suspect that some kind of interrupt
1289          acknowledgement aside from acking the 82596 might be needed
1290          here...  but it's running acceptably without */
1291
1292         ca(dev);
1293
1294         wait_cmd(dev, dma, 100, "i596 interrupt, exit timeout");
1295         DEB(DEB_INTS, printk(KERN_DEBUG "%s: exiting interrupt.\n", dev->name));
1296
1297         spin_unlock (&lp->lock);
1298         return IRQ_HANDLED;
1299 }
1300
1301 static int i596_close(struct net_device *dev)
1302 {
1303         struct i596_private *lp = netdev_priv(dev);
1304         unsigned long flags;
1305
1306         netif_stop_queue(dev);
1307
1308         DEB(DEB_INIT,
1309             printk(KERN_DEBUG
1310                    "%s: Shutting down ethercard, status was %4.4x.\n",
1311                    dev->name, SWAP16(lp->dma->scb.status)));
1312
1313         spin_lock_irqsave(&lp->lock, flags);
1314
1315         wait_cmd(dev, lp->dma, 100, "close1 timed out");
1316         lp->dma->scb.command = SWAP16(CUC_ABORT | RX_ABORT);
1317         DMA_WBACK(dev, &lp->dma->scb, sizeof(struct i596_scb));
1318
1319         ca(dev);
1320
1321         wait_cmd(dev, lp->dma, 100, "close2 timed out");
1322         spin_unlock_irqrestore(&lp->lock, flags);
1323         DEB(DEB_STRUCT, i596_display_data(dev));
1324         i596_cleanup_cmd(dev, lp);
1325
1326         free_irq(dev->irq, dev);
1327         remove_rx_bufs(dev);
1328
1329         return 0;
1330 }
1331
1332 /*
1333  *    Set or clear the multicast filter for this adaptor.
1334  */
1335
1336 static void set_multicast_list(struct net_device *dev)
1337 {
1338         struct i596_private *lp = netdev_priv(dev);
1339         struct i596_dma *dma = lp->dma;
1340         int config = 0, cnt;
1341
1342         DEB(DEB_MULTI,
1343             printk(KERN_DEBUG
1344                    "%s: set multicast list, %d entries, promisc %s, allmulti %s\n",
1345                    dev->name, dev->mc_count,
1346                    dev->flags & IFF_PROMISC ? "ON" : "OFF",
1347                    dev->flags & IFF_ALLMULTI ? "ON" : "OFF"));
1348
1349         if ((dev->flags & IFF_PROMISC) &&
1350             !(dma->cf_cmd.i596_config[8] & 0x01)) {
1351                 dma->cf_cmd.i596_config[8] |= 0x01;
1352                 config = 1;
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_ALLMULTI) &&
1360             (dma->cf_cmd.i596_config[11] & 0x20)) {
1361                 dma->cf_cmd.i596_config[11] &= ~0x20;
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 (config) {
1370                 if (dma->cf_cmd.cmd.command)
1371                         printk(KERN_INFO
1372                                "%s: config change request already queued\n",
1373                                dev->name);
1374                 else {
1375                         dma->cf_cmd.cmd.command = SWAP16(CmdConfigure);
1376                         DMA_WBACK_INV(dev, &dma->cf_cmd, sizeof(struct cf_cmd));
1377                         i596_add_cmd(dev, &dma->cf_cmd.cmd);
1378                 }
1379         }
1380
1381         cnt = dev->mc_count;
1382         if (cnt > MAX_MC_CNT) {
1383                 cnt = MAX_MC_CNT;
1384                 printk(KERN_NOTICE "%s: Only %d multicast addresses supported",
1385                         dev->name, cnt);
1386         }
1387
1388         if (dev->mc_count > 0) {
1389                 struct dev_mc_list *dmi;
1390                 unsigned char *cp;
1391                 struct mc_cmd *cmd;
1392
1393                 cmd = &dma->mc_cmd;
1394                 cmd->cmd.command = SWAP16(CmdMulticastList);
1395                 cmd->mc_cnt = SWAP16(dev->mc_count * 6);
1396                 cp = cmd->mc_addrs;
1397                 for (dmi = dev->mc_list;
1398                      cnt && dmi != NULL;
1399                      dmi = dmi->next, cnt--, cp += 6) {
1400                         memcpy(cp, dmi->dmi_addr, 6);
1401                         if (i596_debug > 1)
1402                                 DEB(DEB_MULTI,
1403                                     printk(KERN_DEBUG
1404                                            "%s: Adding address %pM\n",
1405                                            dev->name, cp));
1406                 }
1407                 DMA_WBACK_INV(dev, &dma->mc_cmd, sizeof(struct mc_cmd));
1408                 i596_add_cmd(dev, &cmd->cmd);
1409         }
1410 }