1 /* 82596.c: A generic 82596 ethernet driver for linux. */
2 /*
3    Based on Apricot.c
4    Written 1994 by Mark Evans.
5    This driver is for the Apricot 82596 bus-master interface
6 
7    Modularised 12/94 Mark Evans
8 
9 
10    Modified to support the 82596 ethernet chips on 680x0 VME boards.
11    by Richard Hirst <richard@sleepie.demon.co.uk>
12    Renamed to be 82596.c
13 
14    980825:  Changed to receive directly in to sk_buffs which are
15    allocated at open() time.  Eliminates copy on incoming frames
16    (small ones are still copied).  Shared data now held in a
17    non-cached page, so we can run on 68060 in copyback mode.
18 
19    TBD:
20    * look at deferring rx frames rather than discarding (as per tulip)
21    * handle tx ring full as per tulip
22    * performance test to tune rx_copybreak
23 
24    Most of my modifications relate to the braindead big-endian
25    implementation by Intel.  When the i596 is operating in
26    'big-endian' mode, it thinks a 32 bit value of 0x12345678
27    should be stored as 0x56781234.  This is a real pain, when
28    you have linked lists which are shared by the 680x0 and the
29    i596.
30 
31    Driver skeleton
32    Written 1993 by Donald Becker.
33    Copyright 1993 United States Government as represented by the Director,
34    National Security Agency. This software may only be used and distributed
35    according to the terms of the GNU General Public License as modified by SRC,
36    incorporated herein by reference.
37 
38    The author may be reached as becker@scyld.com, or C/O
39    Scyld Computing Corporation, 410 Severn Ave., Suite 210, Annapolis MD 21403
40 
41  */
42 
43 #include <linux/module.h>
44 #include <linux/kernel.h>
45 #include <linux/string.h>
46 #include <linux/errno.h>
47 #include <linux/ioport.h>
48 #include <linux/interrupt.h>
49 #include <linux/delay.h>
50 #include <linux/netdevice.h>
51 #include <linux/etherdevice.h>
52 #include <linux/skbuff.h>
53 #include <linux/init.h>
54 #include <linux/bitops.h>
55 #include <linux/gfp.h>
56 
57 #include <asm/io.h>
58 #include <asm/dma.h>
59 #include <asm/pgtable.h>
60 #include <asm/cacheflush.h>
61 
62 static char version[] __initdata =
63 	"82596.c $Revision: 1.5 $\n";
64 
65 #define DRV_NAME	"82596"
66 
67 /* DEBUG flags
68  */
69 
70 #define DEB_INIT	0x0001
71 #define DEB_PROBE	0x0002
72 #define DEB_SERIOUS	0x0004
73 #define DEB_ERRORS	0x0008
74 #define DEB_MULTI	0x0010
75 #define DEB_TDR		0x0020
76 #define DEB_OPEN	0x0040
77 #define DEB_RESET	0x0080
78 #define DEB_ADDCMD	0x0100
79 #define DEB_STATUS	0x0200
80 #define DEB_STARTTX	0x0400
81 #define DEB_RXADDR	0x0800
82 #define DEB_TXADDR	0x1000
83 #define DEB_RXFRAME	0x2000
84 #define DEB_INTS	0x4000
85 #define DEB_STRUCT	0x8000
86 #define DEB_ANY		0xffff
87 
88 
89 #define DEB(x,y)	if (i596_debug & (x)) y
90 
91 
92 #if IS_ENABLED(CONFIG_MVME16x_NET)
93 #define ENABLE_MVME16x_NET
94 #endif
95 #if IS_ENABLED(CONFIG_BVME6000_NET)
96 #define ENABLE_BVME6000_NET
97 #endif
98 
99 #ifdef ENABLE_MVME16x_NET
100 #include <asm/mvme16xhw.h>
101 #endif
102 #ifdef ENABLE_BVME6000_NET
103 #include <asm/bvme6000hw.h>
104 #endif
105 
106 /*
107  * Define various macros for Channel Attention, word swapping etc., dependent
108  * on architecture.  MVME and BVME are 680x0 based, otherwise it is Intel.
109  */
110 
111 #ifdef __mc68000__
112 #define WSWAPrfd(x)  ((struct i596_rfd *) (((u32)(x)<<16) | ((((u32)(x)))>>16)))
113 #define WSWAPrbd(x)  ((struct i596_rbd *) (((u32)(x)<<16) | ((((u32)(x)))>>16)))
114 #define WSWAPiscp(x) ((struct i596_iscp *)(((u32)(x)<<16) | ((((u32)(x)))>>16)))
115 #define WSWAPscb(x)  ((struct i596_scb *) (((u32)(x)<<16) | ((((u32)(x)))>>16)))
116 #define WSWAPcmd(x)  ((struct i596_cmd *) (((u32)(x)<<16) | ((((u32)(x)))>>16)))
117 #define WSWAPtbd(x)  ((struct i596_tbd *) (((u32)(x)<<16) | ((((u32)(x)))>>16)))
118 #define WSWAPchar(x) ((char *)            (((u32)(x)<<16) | ((((u32)(x)))>>16)))
119 #define ISCP_BUSY	0x00010000
120 #else
121 #error 82596.c: unknown architecture
122 #endif
123 
124 /*
125  * These were the intel versions, left here for reference. There
126  * are currently no x86 users of this legacy i82596 chip.
127  */
128 #if 0
129 #define WSWAPrfd(x)     ((struct i596_rfd *)((long)x))
130 #define WSWAPrbd(x)     ((struct i596_rbd *)((long)x))
131 #define WSWAPiscp(x)    ((struct i596_iscp *)((long)x))
132 #define WSWAPscb(x)     ((struct i596_scb *)((long)x))
133 #define WSWAPcmd(x)     ((struct i596_cmd *)((long)x))
134 #define WSWAPtbd(x)     ((struct i596_tbd *)((long)x))
135 #define WSWAPchar(x)    ((char *)((long)x))
136 #define ISCP_BUSY	0x0001
137 #endif
138 
139 /*
140  * The MPU_PORT command allows direct access to the 82596. With PORT access
141  * the following commands are available (p5-18). The 32-bit port command
142  * must be word-swapped with the most significant word written first.
143  * This only applies to VME boards.
144  */
145 #define PORT_RESET		0x00	/* reset 82596 */
146 #define PORT_SELFTEST		0x01	/* selftest */
147 #define PORT_ALTSCP		0x02	/* alternate SCB address */
148 #define PORT_ALTDUMP		0x03	/* Alternate DUMP address */
149 
150 static int i596_debug = (DEB_SERIOUS|DEB_PROBE);
151 
152 MODULE_AUTHOR("Richard Hirst");
153 MODULE_DESCRIPTION("i82596 driver");
154 MODULE_LICENSE("GPL");
155 
156 module_param(i596_debug, int, 0);
157 MODULE_PARM_DESC(i596_debug, "i82596 debug mask");
158 
159 
160 /* Copy frames shorter than rx_copybreak, otherwise pass on up in
161  * a full sized sk_buff.  Value of 100 stolen from tulip.c (!alpha).
162  */
163 static int rx_copybreak = 100;
164 
165 #define PKT_BUF_SZ	1536
166 #define MAX_MC_CNT	64
167 
168 #define I596_TOTAL_SIZE 17
169 
170 #define I596_NULL ((void *)0xffffffff)
171 
172 #define CMD_EOL		0x8000	/* The last command of the list, stop. */
173 #define CMD_SUSP	0x4000	/* Suspend after doing cmd. */
174 #define CMD_INTR	0x2000	/* Interrupt after doing cmd. */
175 
176 #define CMD_FLEX	0x0008	/* Enable flexible memory model */
177 
178 enum commands {
179 	CmdNOp = 0, CmdSASetup = 1, CmdConfigure = 2, CmdMulticastList = 3,
180 	CmdTx = 4, CmdTDR = 5, CmdDump = 6, CmdDiagnose = 7
181 };
182 
183 #define STAT_C		0x8000	/* Set to 0 after execution */
184 #define STAT_B		0x4000	/* Command being executed */
185 #define STAT_OK		0x2000	/* Command executed ok */
186 #define STAT_A		0x1000	/* Command aborted */
187 
188 #define	 CUC_START	0x0100
189 #define	 CUC_RESUME	0x0200
190 #define	 CUC_SUSPEND    0x0300
191 #define	 CUC_ABORT	0x0400
192 #define	 RX_START	0x0010
193 #define	 RX_RESUME	0x0020
194 #define	 RX_SUSPEND	0x0030
195 #define	 RX_ABORT	0x0040
196 
197 #define TX_TIMEOUT	(HZ/20)
198 
199 
200 struct i596_reg {
201 	unsigned short porthi;
202 	unsigned short portlo;
203 	unsigned long ca;
204 };
205 
206 #define EOF		0x8000
207 #define SIZE_MASK	0x3fff
208 
209 struct i596_tbd {
210 	unsigned short size;
211 	unsigned short pad;
212 	struct i596_tbd *next;
213 	char *data;
214 };
215 
216 /* The command structure has two 'next' pointers; v_next is the address of
217  * the next command as seen by the CPU, b_next is the address of the next
218  * command as seen by the 82596.  The b_next pointer, as used by the 82596
219  * always references the status field of the next command, rather than the
220  * v_next field, because the 82596 is unaware of v_next.  It may seem more
221  * logical to put v_next at the end of the structure, but we cannot do that
222  * because the 82596 expects other fields to be there, depending on command
223  * type.
224  */
225 
226 struct i596_cmd {
227 	struct i596_cmd *v_next;	/* Address from CPUs viewpoint */
228 	unsigned short status;
229 	unsigned short command;
230 	struct i596_cmd *b_next;	/* Address from i596 viewpoint */
231 };
232 
233 struct tx_cmd {
234 	struct i596_cmd cmd;
235 	struct i596_tbd *tbd;
236 	unsigned short size;
237 	unsigned short pad;
238 	struct sk_buff *skb;	/* So we can free it after tx */
239 };
240 
241 struct tdr_cmd {
242 	struct i596_cmd cmd;
243 	unsigned short status;
244 	unsigned short pad;
245 };
246 
247 struct mc_cmd {
248 	struct i596_cmd cmd;
249 	short mc_cnt;
250 	char mc_addrs[MAX_MC_CNT*6];
251 };
252 
253 struct sa_cmd {
254 	struct i596_cmd cmd;
255 	char eth_addr[8];
256 };
257 
258 struct cf_cmd {
259 	struct i596_cmd cmd;
260 	char i596_config[16];
261 };
262 
263 struct i596_rfd {
264 	unsigned short stat;
265 	unsigned short cmd;
266 	struct i596_rfd *b_next;	/* Address from i596 viewpoint */
267 	struct i596_rbd *rbd;
268 	unsigned short count;
269 	unsigned short size;
270 	struct i596_rfd *v_next;	/* Address from CPUs viewpoint */
271 	struct i596_rfd *v_prev;
272 };
273 
274 struct i596_rbd {
275     unsigned short count;
276     unsigned short zero1;
277     struct i596_rbd *b_next;
278     unsigned char *b_data;		/* Address from i596 viewpoint */
279     unsigned short size;
280     unsigned short zero2;
281     struct sk_buff *skb;
282     struct i596_rbd *v_next;
283     struct i596_rbd *b_addr;		/* This rbd addr from i596 view */
284     unsigned char *v_data;		/* Address from CPUs viewpoint */
285 };
286 
287 #define TX_RING_SIZE 64
288 #define RX_RING_SIZE 16
289 
290 struct i596_scb {
291 	unsigned short status;
292 	unsigned short command;
293 	struct i596_cmd *cmd;
294 	struct i596_rfd *rfd;
295 	unsigned long crc_err;
296 	unsigned long align_err;
297 	unsigned long resource_err;
298 	unsigned long over_err;
299 	unsigned long rcvdt_err;
300 	unsigned long short_err;
301 	unsigned short t_on;
302 	unsigned short t_off;
303 };
304 
305 struct i596_iscp {
306 	unsigned long stat;
307 	struct i596_scb *scb;
308 };
309 
310 struct i596_scp {
311 	unsigned long sysbus;
312 	unsigned long pad;
313 	struct i596_iscp *iscp;
314 };
315 
316 struct i596_private {
317 	volatile struct i596_scp scp;
318 	volatile struct i596_iscp iscp;
319 	volatile struct i596_scb scb;
320 	struct sa_cmd sa_cmd;
321 	struct cf_cmd cf_cmd;
322 	struct tdr_cmd tdr_cmd;
323 	struct mc_cmd mc_cmd;
324 	unsigned long stat;
325 	int last_restart __attribute__((aligned(4)));
326 	struct i596_rfd *rfd_head;
327 	struct i596_rbd *rbd_head;
328 	struct i596_cmd *cmd_tail;
329 	struct i596_cmd *cmd_head;
330 	int cmd_backlog;
331 	unsigned long last_cmd;
332 	struct i596_rfd rfds[RX_RING_SIZE];
333 	struct i596_rbd rbds[RX_RING_SIZE];
334 	struct tx_cmd tx_cmds[TX_RING_SIZE];
335 	struct i596_tbd tbds[TX_RING_SIZE];
336 	int next_tx_cmd;
337 	spinlock_t lock;
338 };
339 
340 static char init_setup[] =
341 {
342 	0x8E,			/* length, prefetch on */
343 	0xC8,			/* fifo to 8, monitor off */
344 #ifdef CONFIG_VME
345 	0xc0,			/* don't save bad frames */
346 #else
347 	0x80,			/* don't save bad frames */
348 #endif
349 	0x2E,			/* No source address insertion, 8 byte preamble */
350 	0x00,			/* priority and backoff defaults */
351 	0x60,			/* interframe spacing */
352 	0x00,			/* slot time LSB */
353 	0xf2,			/* slot time and retries */
354 	0x00,			/* promiscuous mode */
355 	0x00,			/* collision detect */
356 	0x40,			/* minimum frame length */
357 	0xff,
358 	0x00,
359 	0x7f /*  *multi IA */ };
360 
361 static int i596_open(struct net_device *dev);
362 static netdev_tx_t i596_start_xmit(struct sk_buff *skb, struct net_device *dev);
363 static irqreturn_t i596_interrupt(int irq, void *dev_id);
364 static int i596_close(struct net_device *dev);
365 static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd);
366 static void i596_tx_timeout (struct net_device *dev);
367 static void print_eth(unsigned char *buf, char *str);
368 static void set_multicast_list(struct net_device *dev);
369 
370 static int rx_ring_size = RX_RING_SIZE;
371 static int ticks_limit = 25;
372 static int max_cmd_backlog = TX_RING_SIZE-1;
373 
374 
375 static inline void CA(struct net_device *dev)
376 {
377 #ifdef ENABLE_MVME16x_NET
378 	if (MACH_IS_MVME16x) {
379 		((struct i596_reg *) dev->base_addr)->ca = 1;
380 	}
381 #endif
382 #ifdef ENABLE_BVME6000_NET
383 	if (MACH_IS_BVME6000) {
384 		volatile u32 i;
385 
386 		i = *(volatile u32 *) (dev->base_addr);
387 	}
388 #endif
389 }
390 
391 
392 static inline void MPU_PORT(struct net_device *dev, int c, volatile void *x)
393 {
394 #ifdef ENABLE_MVME16x_NET
395 	if (MACH_IS_MVME16x) {
396 		struct i596_reg *p = (struct i596_reg *) (dev->base_addr);
397 		p->porthi = ((c) | (u32) (x)) & 0xffff;
398 		p->portlo = ((c) | (u32) (x)) >> 16;
399 	}
400 #endif
401 #ifdef ENABLE_BVME6000_NET
402 	if (MACH_IS_BVME6000) {
403 		u32 v = (u32) (c) | (u32) (x);
404 		v = ((u32) (v) << 16) | ((u32) (v) >> 16);
405 		*(volatile u32 *) dev->base_addr = v;
406 		udelay(1);
407 		*(volatile u32 *) dev->base_addr = v;
408 	}
409 #endif
410 }
411 
412 
413 static inline int wait_istat(struct net_device *dev, struct i596_private *lp, int delcnt, char *str)
414 {
415 	while (--delcnt && lp->iscp.stat)
416 		udelay(10);
417 	if (!delcnt) {
418 		printk(KERN_ERR "%s: %s, status %4.4x, cmd %4.4x.\n",
419 		     dev->name, str, lp->scb.status, lp->scb.command);
420 		return -1;
421 	}
422 	else
423 		return 0;
424 }
425 
426 
427 static inline int wait_cmd(struct net_device *dev, struct i596_private *lp, int delcnt, char *str)
428 {
429 	while (--delcnt && lp->scb.command)
430 		udelay(10);
431 	if (!delcnt) {
432 		printk(KERN_ERR "%s: %s, status %4.4x, cmd %4.4x.\n",
433 		     dev->name, str, lp->scb.status, lp->scb.command);
434 		return -1;
435 	}
436 	else
437 		return 0;
438 }
439 
440 
441 static inline int wait_cfg(struct net_device *dev, struct i596_cmd *cmd, int delcnt, char *str)
442 {
443 	volatile struct i596_cmd *c = cmd;
444 
445 	while (--delcnt && c->command)
446 		udelay(10);
447 	if (!delcnt) {
448 		printk(KERN_ERR "%s: %s.\n", dev->name, str);
449 		return -1;
450 	}
451 	else
452 		return 0;
453 }
454 
455 
456 static void i596_display_data(struct net_device *dev)
457 {
458 	struct i596_private *lp = dev->ml_priv;
459 	struct i596_cmd *cmd;
460 	struct i596_rfd *rfd;
461 	struct i596_rbd *rbd;
462 
463 	printk(KERN_ERR "lp and scp at %p, .sysbus = %08lx, .iscp = %p\n",
464 	       &lp->scp, lp->scp.sysbus, lp->scp.iscp);
465 	printk(KERN_ERR "iscp at %p, iscp.stat = %08lx, .scb = %p\n",
466 	       &lp->iscp, lp->iscp.stat, lp->iscp.scb);
467 	printk(KERN_ERR "scb at %p, scb.status = %04x, .command = %04x,"
468 		" .cmd = %p, .rfd = %p\n",
469 	       &lp->scb, lp->scb.status, lp->scb.command,
470 		lp->scb.cmd, lp->scb.rfd);
471 	printk(KERN_ERR "   errors: crc %lx, align %lx, resource %lx,"
472                " over %lx, rcvdt %lx, short %lx\n",
473 		lp->scb.crc_err, lp->scb.align_err, lp->scb.resource_err,
474 		lp->scb.over_err, lp->scb.rcvdt_err, lp->scb.short_err);
475 	cmd = lp->cmd_head;
476 	while (cmd != I596_NULL) {
477 		printk(KERN_ERR "cmd at %p, .status = %04x, .command = %04x, .b_next = %p\n",
478 		  cmd, cmd->status, cmd->command, cmd->b_next);
479 		cmd = cmd->v_next;
480 	}
481 	rfd = lp->rfd_head;
482 	printk(KERN_ERR "rfd_head = %p\n", rfd);
483 	do {
484 		printk(KERN_ERR "   %p .stat %04x, .cmd %04x, b_next %p, rbd %p,"
485                         " count %04x\n",
486 			rfd, rfd->stat, rfd->cmd, rfd->b_next, rfd->rbd,
487 			rfd->count);
488 		rfd = rfd->v_next;
489 	} while (rfd != lp->rfd_head);
490 	rbd = lp->rbd_head;
491 	printk(KERN_ERR "rbd_head = %p\n", rbd);
492 	do {
493 		printk(KERN_ERR "   %p .count %04x, b_next %p, b_data %p, size %04x\n",
494 			rbd, rbd->count, rbd->b_next, rbd->b_data, rbd->size);
495 		rbd = rbd->v_next;
496 	} while (rbd != lp->rbd_head);
497 }
498 
499 
500 #if defined(ENABLE_MVME16x_NET) || defined(ENABLE_BVME6000_NET)
501 static irqreturn_t i596_error(int irq, void *dev_id)
502 {
503 	struct net_device *dev = dev_id;
504 #ifdef ENABLE_MVME16x_NET
505 	if (MACH_IS_MVME16x) {
506 		volatile unsigned char *pcc2 = (unsigned char *) 0xfff42000;
507 
508 		pcc2[0x28] = 1;
509 		pcc2[0x2b] = 0x1d;
510 	}
511 #endif
512 #ifdef ENABLE_BVME6000_NET
513 	if (MACH_IS_BVME6000) {
514 		volatile unsigned char *ethirq = (unsigned char *) BVME_ETHIRQ_REG;
515 
516 		*ethirq = 1;
517 		*ethirq = 3;
518 	}
519 #endif
520 	printk(KERN_ERR "%s: Error interrupt\n", dev->name);
521 	i596_display_data(dev);
522 	return IRQ_HANDLED;
523 }
524 #endif
525 
526 static inline void remove_rx_bufs(struct net_device *dev)
527 {
528 	struct i596_private *lp = dev->ml_priv;
529 	struct i596_rbd *rbd;
530 	int i;
531 
532 	for (i = 0, rbd = lp->rbds; i < rx_ring_size; i++, rbd++) {
533 		if (rbd->skb == NULL)
534 			break;
535 		dev_kfree_skb(rbd->skb);
536 		rbd->skb = NULL;
537 	}
538 }
539 
540 static inline int init_rx_bufs(struct net_device *dev)
541 {
542 	struct i596_private *lp = dev->ml_priv;
543 	int i;
544 	struct i596_rfd *rfd;
545 	struct i596_rbd *rbd;
546 
547 	/* First build the Receive Buffer Descriptor List */
548 
549 	for (i = 0, rbd = lp->rbds; i < rx_ring_size; i++, rbd++) {
550 		struct sk_buff *skb = netdev_alloc_skb(dev, PKT_BUF_SZ);
551 
552 		if (skb == NULL) {
553 			remove_rx_bufs(dev);
554 			return -ENOMEM;
555 		}
556 
557 		rbd->v_next = rbd+1;
558 		rbd->b_next = WSWAPrbd(virt_to_bus(rbd+1));
559 		rbd->b_addr = WSWAPrbd(virt_to_bus(rbd));
560 		rbd->skb = skb;
561 		rbd->v_data = skb->data;
562 		rbd->b_data = WSWAPchar(virt_to_bus(skb->data));
563 		rbd->size = PKT_BUF_SZ;
564 #ifdef __mc68000__
565 		cache_clear(virt_to_phys(skb->data), PKT_BUF_SZ);
566 #endif
567 	}
568 	lp->rbd_head = lp->rbds;
569 	rbd = lp->rbds + rx_ring_size - 1;
570 	rbd->v_next = lp->rbds;
571 	rbd->b_next = WSWAPrbd(virt_to_bus(lp->rbds));
572 
573 	/* Now build the Receive Frame Descriptor List */
574 
575 	for (i = 0, rfd = lp->rfds; i < rx_ring_size; i++, rfd++) {
576 		rfd->rbd = I596_NULL;
577 		rfd->v_next = rfd+1;
578 		rfd->v_prev = rfd-1;
579 		rfd->b_next = WSWAPrfd(virt_to_bus(rfd+1));
580 		rfd->cmd = CMD_FLEX;
581 	}
582 	lp->rfd_head = lp->rfds;
583 	lp->scb.rfd = WSWAPrfd(virt_to_bus(lp->rfds));
584 	rfd = lp->rfds;
585 	rfd->rbd = lp->rbd_head;
586 	rfd->v_prev = lp->rfds + rx_ring_size - 1;
587 	rfd = lp->rfds + rx_ring_size - 1;
588 	rfd->v_next = lp->rfds;
589 	rfd->b_next = WSWAPrfd(virt_to_bus(lp->rfds));
590 	rfd->cmd = CMD_EOL|CMD_FLEX;
591 
592 	return 0;
593 }
594 
595 
596 static void rebuild_rx_bufs(struct net_device *dev)
597 {
598 	struct i596_private *lp = dev->ml_priv;
599 	int i;
600 
601 	/* Ensure rx frame/buffer descriptors are tidy */
602 
603 	for (i = 0; i < rx_ring_size; i++) {
604 		lp->rfds[i].rbd = I596_NULL;
605 		lp->rfds[i].cmd = CMD_FLEX;
606 	}
607 	lp->rfds[rx_ring_size-1].cmd = CMD_EOL|CMD_FLEX;
608 	lp->rfd_head = lp->rfds;
609 	lp->scb.rfd = WSWAPrfd(virt_to_bus(lp->rfds));
610 	lp->rbd_head = lp->rbds;
611 	lp->rfds[0].rbd = WSWAPrbd(virt_to_bus(lp->rbds));
612 }
613 
614 
615 static int init_i596_mem(struct net_device *dev)
616 {
617 	struct i596_private *lp = dev->ml_priv;
618 	unsigned long flags;
619 
620 	MPU_PORT(dev, PORT_RESET, NULL);
621 
622 	udelay(100);		/* Wait 100us - seems to help */
623 
624 #if defined(ENABLE_MVME16x_NET) || defined(ENABLE_BVME6000_NET)
625 #ifdef ENABLE_MVME16x_NET
626 	if (MACH_IS_MVME16x) {
627 		volatile unsigned char *pcc2 = (unsigned char *) 0xfff42000;
628 
629 		/* Disable all ints for now */
630 		pcc2[0x28] = 1;
631 		pcc2[0x2a] = 0x48;
632 		/* Following disables snooping.  Snooping is not required
633 		 * as we make appropriate use of non-cached pages for
634 		 * shared data, and cache_push/cache_clear.
635 		 */
636 		pcc2[0x2b] = 0x08;
637 	}
638 #endif
639 #ifdef ENABLE_BVME6000_NET
640 	if (MACH_IS_BVME6000) {
641 		volatile unsigned char *ethirq = (unsigned char *) BVME_ETHIRQ_REG;
642 
643 		*ethirq = 1;
644 	}
645 #endif
646 
647 	/* change the scp address */
648 
649 	MPU_PORT(dev, PORT_ALTSCP, (void *)virt_to_bus((void *)&lp->scp));
650 
651 #endif
652 
653 	lp->last_cmd = jiffies;
654 
655 #ifdef ENABLE_MVME16x_NET
656 	if (MACH_IS_MVME16x)
657 		lp->scp.sysbus = 0x00000054;
658 #endif
659 #ifdef ENABLE_BVME6000_NET
660 	if (MACH_IS_BVME6000)
661 		lp->scp.sysbus = 0x0000004c;
662 #endif
663 
664 	lp->scp.iscp = WSWAPiscp(virt_to_bus((void *)&lp->iscp));
665 	lp->iscp.scb = WSWAPscb(virt_to_bus((void *)&lp->scb));
666 	lp->iscp.stat = ISCP_BUSY;
667 	lp->cmd_backlog = 0;
668 
669 	lp->cmd_head = lp->scb.cmd = I596_NULL;
670 
671 #ifdef ENABLE_BVME6000_NET
672 	if (MACH_IS_BVME6000) {
673 		lp->scb.t_on  = 7 * 25;
674 		lp->scb.t_off = 1 * 25;
675 	}
676 #endif
677 
678 	DEB(DEB_INIT,printk(KERN_DEBUG "%s: starting i82596.\n", dev->name));
679 
680 	CA(dev);
681 
682 	if (wait_istat(dev,lp,1000,"initialization timed out"))
683 		goto failed;
684 	DEB(DEB_INIT,printk(KERN_DEBUG "%s: i82596 initialization successful\n", dev->name));
685 
686 	/* Ensure rx frame/buffer descriptors are tidy */
687 	rebuild_rx_bufs(dev);
688 	lp->scb.command = 0;
689 
690 #ifdef ENABLE_MVME16x_NET
691 	if (MACH_IS_MVME16x) {
692 		volatile unsigned char *pcc2 = (unsigned char *) 0xfff42000;
693 
694 		/* Enable ints, etc. now */
695 		pcc2[0x2a] = 0x55;	/* Edge sensitive */
696 		pcc2[0x2b] = 0x15;
697 	}
698 #endif
699 #ifdef ENABLE_BVME6000_NET
700 	if (MACH_IS_BVME6000) {
701 		volatile unsigned char *ethirq = (unsigned char *) BVME_ETHIRQ_REG;
702 
703 		*ethirq = 3;
704 	}
705 #endif
706 
707 
708 	DEB(DEB_INIT,printk(KERN_DEBUG "%s: queuing CmdConfigure\n", dev->name));
709 	memcpy(lp->cf_cmd.i596_config, init_setup, 14);
710 	lp->cf_cmd.cmd.command = CmdConfigure;
711 	i596_add_cmd(dev, &lp->cf_cmd.cmd);
712 
713 	DEB(DEB_INIT,printk(KERN_DEBUG "%s: queuing CmdSASetup\n", dev->name));
714 	memcpy(lp->sa_cmd.eth_addr, dev->dev_addr, ETH_ALEN);
715 	lp->sa_cmd.cmd.command = CmdSASetup;
716 	i596_add_cmd(dev, &lp->sa_cmd.cmd);
717 
718 	DEB(DEB_INIT,printk(KERN_DEBUG "%s: queuing CmdTDR\n", dev->name));
719 	lp->tdr_cmd.cmd.command = CmdTDR;
720 	i596_add_cmd(dev, &lp->tdr_cmd.cmd);
721 
722 	spin_lock_irqsave (&lp->lock, flags);
723 
724 	if (wait_cmd(dev,lp,1000,"timed out waiting to issue RX_START")) {
725 		spin_unlock_irqrestore (&lp->lock, flags);
726 		goto failed;
727 	}
728 	DEB(DEB_INIT,printk(KERN_DEBUG "%s: Issuing RX_START\n", dev->name));
729 	lp->scb.command = RX_START;
730 	CA(dev);
731 
732 	spin_unlock_irqrestore (&lp->lock, flags);
733 
734 	if (wait_cmd(dev,lp,1000,"RX_START not processed"))
735 		goto failed;
736 	DEB(DEB_INIT,printk(KERN_DEBUG "%s: Receive unit started OK\n", dev->name));
737 	return 0;
738 
739 failed:
740 	printk(KERN_CRIT "%s: Failed to initialise 82596\n", dev->name);
741 	MPU_PORT(dev, PORT_RESET, NULL);
742 	return -1;
743 }
744 
745 static inline int i596_rx(struct net_device *dev)
746 {
747 	struct i596_private *lp = dev->ml_priv;
748 	struct i596_rfd *rfd;
749 	struct i596_rbd *rbd;
750 	int frames = 0;
751 
752 	DEB(DEB_RXFRAME,printk(KERN_DEBUG "i596_rx(), rfd_head %p, rbd_head %p\n",
753 			lp->rfd_head, lp->rbd_head));
754 
755 	rfd = lp->rfd_head;		/* Ref next frame to check */
756 
757 	while ((rfd->stat) & STAT_C) {	/* Loop while complete frames */
758 		if (rfd->rbd == I596_NULL)
759 			rbd = I596_NULL;
760 		else if (rfd->rbd == lp->rbd_head->b_addr)
761 			rbd = lp->rbd_head;
762 		else {
763 			printk(KERN_CRIT "%s: rbd chain broken!\n", dev->name);
764 			/* XXX Now what? */
765 			rbd = I596_NULL;
766 		}
767 		DEB(DEB_RXFRAME, printk(KERN_DEBUG "  rfd %p, rfd.rbd %p, rfd.stat %04x\n",
768 			rfd, rfd->rbd, rfd->stat));
769 
770 		if (rbd != I596_NULL && ((rfd->stat) & STAT_OK)) {
771 			/* a good frame */
772 			int pkt_len = rbd->count & 0x3fff;
773 			struct sk_buff *skb = rbd->skb;
774 			int rx_in_place = 0;
775 
776 			DEB(DEB_RXADDR,print_eth(rbd->v_data, "received"));
777 			frames++;
778 
779 			/* Check if the packet is long enough to just accept
780 			 * without copying to a properly sized skbuff.
781 			 */
782 
783 			if (pkt_len > rx_copybreak) {
784 				struct sk_buff *newskb;
785 
786 				/* Get fresh skbuff to replace filled one. */
787 				newskb = netdev_alloc_skb(dev, PKT_BUF_SZ);
788 				if (newskb == NULL) {
789 					skb = NULL;	/* drop pkt */
790 					goto memory_squeeze;
791 				}
792 				/* Pass up the skb already on the Rx ring. */
793 				skb_put(skb, pkt_len);
794 				rx_in_place = 1;
795 				rbd->skb = newskb;
796 				rbd->v_data = newskb->data;
797 				rbd->b_data = WSWAPchar(virt_to_bus(newskb->data));
798 #ifdef __mc68000__
799 				cache_clear(virt_to_phys(newskb->data), PKT_BUF_SZ);
800 #endif
801 			} else {
802 				skb = netdev_alloc_skb(dev, pkt_len + 2);
803 			}
804 memory_squeeze:
805 			if (skb == NULL) {
806 				/* XXX tulip.c can defer packets here!! */
807 				dev->stats.rx_dropped++;
808 			} else {
809 				if (!rx_in_place) {
810 					/* 16 byte align the data fields */
811 					skb_reserve(skb, 2);
812 					skb_put_data(skb, rbd->v_data,
813 						     pkt_len);
814 				}
815 				skb->protocol=eth_type_trans(skb,dev);
816 				skb->len = pkt_len;
817 #ifdef __mc68000__
818 				cache_clear(virt_to_phys(rbd->skb->data),
819 						pkt_len);
820 #endif
821 				netif_rx(skb);
822 				dev->stats.rx_packets++;
823 				dev->stats.rx_bytes+=pkt_len;
824 			}
825 		}
826 		else {
827 			DEB(DEB_ERRORS, printk(KERN_DEBUG "%s: Error, rfd.stat = 0x%04x\n",
828 					dev->name, rfd->stat));
829 			dev->stats.rx_errors++;
830 			if ((rfd->stat) & 0x0001)
831 				dev->stats.collisions++;
832 			if ((rfd->stat) & 0x0080)
833 				dev->stats.rx_length_errors++;
834 			if ((rfd->stat) & 0x0100)
835 				dev->stats.rx_over_errors++;
836 			if ((rfd->stat) & 0x0200)
837 				dev->stats.rx_fifo_errors++;
838 			if ((rfd->stat) & 0x0400)
839 				dev->stats.rx_frame_errors++;
840 			if ((rfd->stat) & 0x0800)
841 				dev->stats.rx_crc_errors++;
842 			if ((rfd->stat) & 0x1000)
843 				dev->stats.rx_length_errors++;
844 		}
845 
846 		/* Clear the buffer descriptor count and EOF + F flags */
847 
848 		if (rbd != I596_NULL && (rbd->count & 0x4000)) {
849 			rbd->count = 0;
850 			lp->rbd_head = rbd->v_next;
851 		}
852 
853 		/* Tidy the frame descriptor, marking it as end of list */
854 
855 		rfd->rbd = I596_NULL;
856 		rfd->stat = 0;
857 		rfd->cmd = CMD_EOL|CMD_FLEX;
858 		rfd->count = 0;
859 
860 		/* Remove end-of-list from old end descriptor */
861 
862 		rfd->v_prev->cmd = CMD_FLEX;
863 
864 		/* Update record of next frame descriptor to process */
865 
866 		lp->scb.rfd = rfd->b_next;
867 		lp->rfd_head = rfd->v_next;
868 		rfd = lp->rfd_head;
869 	}
870 
871 	DEB(DEB_RXFRAME,printk(KERN_DEBUG "frames %d\n", frames));
872 
873 	return 0;
874 }
875 
876 
877 static void i596_cleanup_cmd(struct net_device *dev, struct i596_private *lp)
878 {
879 	struct i596_cmd *ptr;
880 
881 	while (lp->cmd_head != I596_NULL) {
882 		ptr = lp->cmd_head;
883 		lp->cmd_head = ptr->v_next;
884 		lp->cmd_backlog--;
885 
886 		switch ((ptr->command) & 0x7) {
887 		case CmdTx:
888 			{
889 				struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
890 				struct sk_buff *skb = tx_cmd->skb;
891 
892 				dev_kfree_skb(skb);
893 
894 				dev->stats.tx_errors++;
895 				dev->stats.tx_aborted_errors++;
896 
897 				ptr->v_next = ptr->b_next = I596_NULL;
898 				tx_cmd->cmd.command = 0;  /* Mark as free */
899 				break;
900 			}
901 		default:
902 			ptr->v_next = ptr->b_next = I596_NULL;
903 		}
904 	}
905 
906 	wait_cmd(dev,lp,100,"i596_cleanup_cmd timed out");
907 	lp->scb.cmd = I596_NULL;
908 }
909 
910 static void i596_reset(struct net_device *dev, struct i596_private *lp,
911 			int ioaddr)
912 {
913 	unsigned long flags;
914 
915 	DEB(DEB_RESET,printk(KERN_DEBUG "i596_reset\n"));
916 
917 	spin_lock_irqsave (&lp->lock, flags);
918 
919 	wait_cmd(dev,lp,100,"i596_reset timed out");
920 
921 	netif_stop_queue(dev);
922 
923 	lp->scb.command = CUC_ABORT | RX_ABORT;
924 	CA(dev);
925 
926 	/* wait for shutdown */
927 	wait_cmd(dev,lp,1000,"i596_reset 2 timed out");
928 	spin_unlock_irqrestore (&lp->lock, flags);
929 
930 	i596_cleanup_cmd(dev,lp);
931 	i596_rx(dev);
932 
933 	netif_start_queue(dev);
934 	init_i596_mem(dev);
935 }
936 
937 static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd)
938 {
939 	struct i596_private *lp = dev->ml_priv;
940 	int ioaddr = dev->base_addr;
941 	unsigned long flags;
942 
943 	DEB(DEB_ADDCMD,printk(KERN_DEBUG "i596_add_cmd\n"));
944 
945 	cmd->status = 0;
946 	cmd->command |= (CMD_EOL | CMD_INTR);
947 	cmd->v_next = cmd->b_next = I596_NULL;
948 
949 	spin_lock_irqsave (&lp->lock, flags);
950 
951 	if (lp->cmd_head != I596_NULL) {
952 		lp->cmd_tail->v_next = cmd;
953 		lp->cmd_tail->b_next = WSWAPcmd(virt_to_bus(&cmd->status));
954 	} else {
955 		lp->cmd_head = cmd;
956 		wait_cmd(dev,lp,100,"i596_add_cmd timed out");
957 		lp->scb.cmd = WSWAPcmd(virt_to_bus(&cmd->status));
958 		lp->scb.command = CUC_START;
959 		CA(dev);
960 	}
961 	lp->cmd_tail = cmd;
962 	lp->cmd_backlog++;
963 
964 	spin_unlock_irqrestore (&lp->lock, flags);
965 
966 	if (lp->cmd_backlog > max_cmd_backlog) {
967 		unsigned long tickssofar = jiffies - lp->last_cmd;
968 
969 		if (tickssofar < ticks_limit)
970 			return;
971 
972 		printk(KERN_NOTICE "%s: command unit timed out, status resetting.\n", dev->name);
973 
974 		i596_reset(dev, lp, ioaddr);
975 	}
976 }
977 
978 static int i596_open(struct net_device *dev)
979 {
980 	int res = 0;
981 
982 	DEB(DEB_OPEN,printk(KERN_DEBUG "%s: i596_open() irq %d.\n", dev->name, dev->irq));
983 
984 	if (request_irq(dev->irq, i596_interrupt, 0, "i82596", dev)) {
985 		printk(KERN_ERR "%s: IRQ %d not free\n", dev->name, dev->irq);
986 		return -EAGAIN;
987 	}
988 #ifdef ENABLE_MVME16x_NET
989 	if (MACH_IS_MVME16x) {
990 		if (request_irq(0x56, i596_error, 0, "i82596_error", dev)) {
991 			res = -EAGAIN;
992 			goto err_irq_dev;
993 		}
994 	}
995 #endif
996 	res = init_rx_bufs(dev);
997 	if (res)
998 		goto err_irq_56;
999 
1000 	netif_start_queue(dev);
1001 
1002 	if (init_i596_mem(dev)) {
1003 		res = -EAGAIN;
1004 		goto err_queue;
1005 	}
1006 
1007 	return 0;
1008 
1009 err_queue:
1010 	netif_stop_queue(dev);
1011 	remove_rx_bufs(dev);
1012 err_irq_56:
1013 #ifdef ENABLE_MVME16x_NET
1014 	free_irq(0x56, dev);
1015 err_irq_dev:
1016 #endif
1017 	free_irq(dev->irq, dev);
1018 
1019 	return res;
1020 }
1021 
1022 static void i596_tx_timeout (struct net_device *dev)
1023 {
1024 	struct i596_private *lp = dev->ml_priv;
1025 	int ioaddr = dev->base_addr;
1026 
1027 	/* Transmitter timeout, serious problems. */
1028 	DEB(DEB_ERRORS,printk(KERN_ERR "%s: transmit timed out, status resetting.\n",
1029 			dev->name));
1030 
1031 	dev->stats.tx_errors++;
1032 
1033 	/* Try to restart the adaptor */
1034 	if (lp->last_restart == dev->stats.tx_packets) {
1035 		DEB(DEB_ERRORS,printk(KERN_ERR "Resetting board.\n"));
1036 		/* Shutdown and restart */
1037 		i596_reset (dev, lp, ioaddr);
1038 	} else {
1039 		/* Issue a channel attention signal */
1040 		DEB(DEB_ERRORS,printk(KERN_ERR "Kicking board.\n"));
1041 		lp->scb.command = CUC_START | RX_START;
1042 		CA (dev);
1043 		lp->last_restart = dev->stats.tx_packets;
1044 	}
1045 
1046 	netif_trans_update(dev); /* prevent tx timeout */
1047 	netif_wake_queue (dev);
1048 }
1049 
1050 static netdev_tx_t i596_start_xmit(struct sk_buff *skb, struct net_device *dev)
1051 {
1052 	struct i596_private *lp = dev->ml_priv;
1053 	struct tx_cmd *tx_cmd;
1054 	struct i596_tbd *tbd;
1055 	short length = skb->len;
1056 
1057 	DEB(DEB_STARTTX,printk(KERN_DEBUG "%s: i596_start_xmit(%x,%p) called\n",
1058 				dev->name, skb->len, skb->data));
1059 
1060 	if (skb->len < ETH_ZLEN) {
1061 		if (skb_padto(skb, ETH_ZLEN))
1062 			return NETDEV_TX_OK;
1063 		length = ETH_ZLEN;
1064 	}
1065 	netif_stop_queue(dev);
1066 
1067 	tx_cmd = lp->tx_cmds + lp->next_tx_cmd;
1068 	tbd = lp->tbds + lp->next_tx_cmd;
1069 
1070 	if (tx_cmd->cmd.command) {
1071 		printk(KERN_NOTICE "%s: xmit ring full, dropping packet.\n",
1072 				dev->name);
1073 		dev->stats.tx_dropped++;
1074 
1075 		dev_kfree_skb(skb);
1076 	} else {
1077 		if (++lp->next_tx_cmd == TX_RING_SIZE)
1078 			lp->next_tx_cmd = 0;
1079 		tx_cmd->tbd = WSWAPtbd(virt_to_bus(tbd));
1080 		tbd->next = I596_NULL;
1081 
1082 		tx_cmd->cmd.command = CMD_FLEX | CmdTx;
1083 		tx_cmd->skb = skb;
1084 
1085 		tx_cmd->pad = 0;
1086 		tx_cmd->size = 0;
1087 		tbd->pad = 0;
1088 		tbd->size = EOF | length;
1089 
1090 		tbd->data = WSWAPchar(virt_to_bus(skb->data));
1091 
1092 #ifdef __mc68000__
1093 		cache_push(virt_to_phys(skb->data), length);
1094 #endif
1095 		DEB(DEB_TXADDR,print_eth(skb->data, "tx-queued"));
1096 		i596_add_cmd(dev, &tx_cmd->cmd);
1097 
1098 		dev->stats.tx_packets++;
1099 		dev->stats.tx_bytes += length;
1100 	}
1101 
1102 	netif_start_queue(dev);
1103 
1104 	return NETDEV_TX_OK;
1105 }
1106 
1107 static void print_eth(unsigned char *add, char *str)
1108 {
1109 	printk(KERN_DEBUG "i596 0x%p, %pM --> %pM %02X%02X, %s\n",
1110 	       add, add + 6, add, add[12], add[13], str);
1111 }
1112 
1113 static int io = 0x300;
1114 static int irq = 10;
1115 
1116 static const struct net_device_ops i596_netdev_ops = {
1117 	.ndo_open 		= i596_open,
1118 	.ndo_stop		= i596_close,
1119 	.ndo_start_xmit		= i596_start_xmit,
1120 	.ndo_set_rx_mode	= set_multicast_list,
1121 	.ndo_tx_timeout		= i596_tx_timeout,
1122 	.ndo_set_mac_address 	= eth_mac_addr,
1123 	.ndo_validate_addr	= eth_validate_addr,
1124 };
1125 
1126 struct net_device * __init i82596_probe(int unit)
1127 {
1128 	struct net_device *dev;
1129 	int i;
1130 	struct i596_private *lp;
1131 	char eth_addr[8];
1132 	static int probed;
1133 	int err;
1134 
1135 	if (probed)
1136 		return ERR_PTR(-ENODEV);
1137 	probed++;
1138 
1139 	dev = alloc_etherdev(0);
1140 	if (!dev)
1141 		return ERR_PTR(-ENOMEM);
1142 
1143 	if (unit >= 0) {
1144 		sprintf(dev->name, "eth%d", unit);
1145 		netdev_boot_setup_check(dev);
1146 	} else {
1147 		dev->base_addr = io;
1148 		dev->irq = irq;
1149 	}
1150 
1151 #ifdef ENABLE_MVME16x_NET
1152 	if (MACH_IS_MVME16x) {
1153 		if (mvme16x_config & MVME16x_CONFIG_NO_ETHERNET) {
1154 			printk(KERN_NOTICE "Ethernet probe disabled - chip not present\n");
1155 			err = -ENODEV;
1156 			goto out;
1157 		}
1158 		memcpy(eth_addr, (void *) 0xfffc1f2c, ETH_ALEN);	/* YUCK! Get addr from NOVRAM */
1159 		dev->base_addr = MVME_I596_BASE;
1160 		dev->irq = (unsigned) MVME16x_IRQ_I596;
1161 		goto found;
1162 	}
1163 #endif
1164 #ifdef ENABLE_BVME6000_NET
1165 	if (MACH_IS_BVME6000) {
1166 		volatile unsigned char *rtc = (unsigned char *) BVME_RTC_BASE;
1167 		unsigned char msr = rtc[3];
1168 		int i;
1169 
1170 		rtc[3] |= 0x80;
1171 		for (i = 0; i < 6; i++)
1172 			eth_addr[i] = rtc[i * 4 + 7];	/* Stored in RTC RAM at offset 1 */
1173 		rtc[3] = msr;
1174 		dev->base_addr = BVME_I596_BASE;
1175 		dev->irq = (unsigned) BVME_IRQ_I596;
1176 		goto found;
1177 	}
1178 #endif
1179 	err = -ENODEV;
1180 	goto out;
1181 
1182 found:
1183 	dev->mem_start = (int)__get_free_pages(GFP_ATOMIC, 0);
1184 	if (!dev->mem_start) {
1185 		err = -ENOMEM;
1186 		goto out1;
1187 	}
1188 
1189 	DEB(DEB_PROBE,printk(KERN_INFO "%s: 82596 at %#3lx,", dev->name, dev->base_addr));
1190 
1191 	for (i = 0; i < 6; i++)
1192 		DEB(DEB_PROBE,printk(" %2.2X", dev->dev_addr[i] = eth_addr[i]));
1193 
1194 	DEB(DEB_PROBE,printk(" IRQ %d.\n", dev->irq));
1195 
1196 	DEB(DEB_PROBE,printk(KERN_INFO "%s", version));
1197 
1198 	/* The 82596-specific entries in the device structure. */
1199 	dev->netdev_ops = &i596_netdev_ops;
1200 	dev->watchdog_timeo = TX_TIMEOUT;
1201 
1202 	dev->ml_priv = (void *)(dev->mem_start);
1203 
1204 	lp = dev->ml_priv;
1205 	DEB(DEB_INIT,printk(KERN_DEBUG "%s: lp at 0x%08lx (%zd bytes), "
1206 			"lp->scb at 0x%08lx\n",
1207 			dev->name, (unsigned long)lp,
1208 			sizeof(struct i596_private), (unsigned long)&lp->scb));
1209 	memset((void *) lp, 0, sizeof(struct i596_private));
1210 
1211 #ifdef __mc68000__
1212 	cache_push(virt_to_phys((void *)(dev->mem_start)), 4096);
1213 	cache_clear(virt_to_phys((void *)(dev->mem_start)), 4096);
1214 	kernel_set_cachemode((void *)(dev->mem_start), 4096, IOMAP_NOCACHE_SER);
1215 #endif
1216 	lp->scb.command = 0;
1217 	lp->scb.cmd = I596_NULL;
1218 	lp->scb.rfd = I596_NULL;
1219 	spin_lock_init(&lp->lock);
1220 
1221 	err = register_netdev(dev);
1222 	if (err)
1223 		goto out2;
1224 	return dev;
1225 out2:
1226 #ifdef __mc68000__
1227 	/* XXX This assumes default cache mode to be IOMAP_FULL_CACHING,
1228 	 * XXX which may be invalid (CONFIG_060_WRITETHROUGH)
1229 	 */
1230 	kernel_set_cachemode((void *)(dev->mem_start), 4096,
1231 			IOMAP_FULL_CACHING);
1232 #endif
1233 	free_page ((u32)(dev->mem_start));
1234 out1:
1235 out:
1236 	free_netdev(dev);
1237 	return ERR_PTR(err);
1238 }
1239 
1240 static irqreturn_t i596_interrupt(int irq, void *dev_id)
1241 {
1242 	struct net_device *dev = dev_id;
1243 	struct i596_private *lp;
1244 	short ioaddr;
1245 	unsigned short status, ack_cmd = 0;
1246 	int handled = 0;
1247 
1248 #ifdef ENABLE_BVME6000_NET
1249 	if (MACH_IS_BVME6000) {
1250 		if (*(char *) BVME_LOCAL_IRQ_STAT & BVME_ETHERR) {
1251 			i596_error(irq, dev_id);
1252 			return IRQ_HANDLED;
1253 		}
1254 	}
1255 #endif
1256 	if (dev == NULL) {
1257 		printk(KERN_ERR "i596_interrupt(): irq %d for unknown device.\n", irq);
1258 		return IRQ_NONE;
1259 	}
1260 
1261 	ioaddr = dev->base_addr;
1262 	lp = dev->ml_priv;
1263 
1264 	spin_lock (&lp->lock);
1265 
1266 	wait_cmd(dev,lp,100,"i596 interrupt, timeout");
1267 	status = lp->scb.status;
1268 
1269 	DEB(DEB_INTS,printk(KERN_DEBUG "%s: i596 interrupt, IRQ %d, status %4.4x.\n",
1270 			dev->name, irq, status));
1271 
1272 	ack_cmd = status & 0xf000;
1273 
1274 	if ((status & 0x8000) || (status & 0x2000)) {
1275 		struct i596_cmd *ptr;
1276 
1277 		handled = 1;
1278 		if ((status & 0x8000))
1279 			DEB(DEB_INTS,printk(KERN_DEBUG "%s: i596 interrupt completed command.\n", dev->name));
1280 		if ((status & 0x2000))
1281 			DEB(DEB_INTS,printk(KERN_DEBUG "%s: i596 interrupt command unit inactive %x.\n", dev->name, status & 0x0700));
1282 
1283 		while ((lp->cmd_head != I596_NULL) && (lp->cmd_head->status & STAT_C)) {
1284 			ptr = lp->cmd_head;
1285 
1286 			DEB(DEB_STATUS,printk(KERN_DEBUG "cmd_head->status = %04x, ->command = %04x\n",
1287 				       lp->cmd_head->status, lp->cmd_head->command));
1288 			lp->cmd_head = ptr->v_next;
1289 			lp->cmd_backlog--;
1290 
1291 			switch ((ptr->command) & 0x7) {
1292 			case CmdTx:
1293 			    {
1294 				struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
1295 				struct sk_buff *skb = tx_cmd->skb;
1296 
1297 				if ((ptr->status) & STAT_OK) {
1298 					DEB(DEB_TXADDR,print_eth(skb->data, "tx-done"));
1299 				} else {
1300 					dev->stats.tx_errors++;
1301 					if ((ptr->status) & 0x0020)
1302 						dev->stats.collisions++;
1303 					if (!((ptr->status) & 0x0040))
1304 						dev->stats.tx_heartbeat_errors++;
1305 					if ((ptr->status) & 0x0400)
1306 						dev->stats.tx_carrier_errors++;
1307 					if ((ptr->status) & 0x0800)
1308 						dev->stats.collisions++;
1309 					if ((ptr->status) & 0x1000)
1310 						dev->stats.tx_aborted_errors++;
1311 				}
1312 
1313 				dev_kfree_skb_irq(skb);
1314 
1315 				tx_cmd->cmd.command = 0; /* Mark free */
1316 				break;
1317 			    }
1318 			case CmdTDR:
1319 			    {
1320 				unsigned short status = ((struct tdr_cmd *)ptr)->status;
1321 
1322 				if (status & 0x8000) {
1323 					DEB(DEB_TDR,printk(KERN_INFO "%s: link ok.\n", dev->name));
1324 				} else {
1325 					if (status & 0x4000)
1326 						printk(KERN_ERR "%s: Transceiver problem.\n", dev->name);
1327 					if (status & 0x2000)
1328 						printk(KERN_ERR "%s: Termination problem.\n", dev->name);
1329 					if (status & 0x1000)
1330 						printk(KERN_ERR "%s: Short circuit.\n", dev->name);
1331 
1332 					DEB(DEB_TDR,printk(KERN_INFO "%s: Time %d.\n", dev->name, status & 0x07ff));
1333 				}
1334 				break;
1335 			    }
1336 			case CmdConfigure:
1337 			case CmdMulticastList:
1338 				/* Zap command so set_multicast_list() knows it is free */
1339 				ptr->command = 0;
1340 				break;
1341 			}
1342 			ptr->v_next = ptr->b_next = I596_NULL;
1343 			lp->last_cmd = jiffies;
1344 		}
1345 
1346 		ptr = lp->cmd_head;
1347 		while ((ptr != I596_NULL) && (ptr != lp->cmd_tail)) {
1348 			ptr->command &= 0x1fff;
1349 			ptr = ptr->v_next;
1350 		}
1351 
1352 		if ((lp->cmd_head != I596_NULL))
1353 			ack_cmd |= CUC_START;
1354 		lp->scb.cmd = WSWAPcmd(virt_to_bus(&lp->cmd_head->status));
1355 	}
1356 	if ((status & 0x1000) || (status & 0x4000)) {
1357 		if ((status & 0x4000))
1358 			DEB(DEB_INTS,printk(KERN_DEBUG "%s: i596 interrupt received a frame.\n", dev->name));
1359 		i596_rx(dev);
1360 		/* Only RX_START if stopped - RGH 07-07-96 */
1361 		if (status & 0x1000) {
1362 			if (netif_running(dev)) {
1363 				DEB(DEB_ERRORS,printk(KERN_ERR "%s: i596 interrupt receive unit inactive, status 0x%x\n", dev->name, status));
1364 				ack_cmd |= RX_START;
1365 				dev->stats.rx_errors++;
1366 				dev->stats.rx_fifo_errors++;
1367 				rebuild_rx_bufs(dev);
1368 			}
1369 		}
1370 	}
1371 	wait_cmd(dev,lp,100,"i596 interrupt, timeout");
1372 	lp->scb.command = ack_cmd;
1373 
1374 #ifdef ENABLE_MVME16x_NET
1375 	if (MACH_IS_MVME16x) {
1376 		/* Ack the interrupt */
1377 
1378 		volatile unsigned char *pcc2 = (unsigned char *) 0xfff42000;
1379 
1380 		pcc2[0x2a] |= 0x08;
1381 	}
1382 #endif
1383 #ifdef ENABLE_BVME6000_NET
1384 	if (MACH_IS_BVME6000) {
1385 		volatile unsigned char *ethirq = (unsigned char *) BVME_ETHIRQ_REG;
1386 
1387 		*ethirq = 1;
1388 		*ethirq = 3;
1389 	}
1390 #endif
1391 	CA(dev);
1392 
1393 	DEB(DEB_INTS,printk(KERN_DEBUG "%s: exiting interrupt.\n", dev->name));
1394 
1395 	spin_unlock (&lp->lock);
1396 	return IRQ_RETVAL(handled);
1397 }
1398 
1399 static int i596_close(struct net_device *dev)
1400 {
1401 	struct i596_private *lp = dev->ml_priv;
1402 	unsigned long flags;
1403 
1404 	netif_stop_queue(dev);
1405 
1406 	DEB(DEB_INIT,printk(KERN_DEBUG "%s: Shutting down ethercard, status was %4.4x.\n",
1407 		       dev->name, lp->scb.status));
1408 
1409 	spin_lock_irqsave(&lp->lock, flags);
1410 
1411 	wait_cmd(dev,lp,100,"close1 timed out");
1412 	lp->scb.command = CUC_ABORT | RX_ABORT;
1413 	CA(dev);
1414 
1415 	wait_cmd(dev,lp,100,"close2 timed out");
1416 
1417 	spin_unlock_irqrestore(&lp->lock, flags);
1418 	DEB(DEB_STRUCT,i596_display_data(dev));
1419 	i596_cleanup_cmd(dev,lp);
1420 
1421 #ifdef ENABLE_MVME16x_NET
1422 	if (MACH_IS_MVME16x) {
1423 		volatile unsigned char *pcc2 = (unsigned char *) 0xfff42000;
1424 
1425 		/* Disable all ints */
1426 		pcc2[0x28] = 1;
1427 		pcc2[0x2a] = 0x40;
1428 		pcc2[0x2b] = 0x40;	/* Set snooping bits now! */
1429 	}
1430 #endif
1431 #ifdef ENABLE_BVME6000_NET
1432 	if (MACH_IS_BVME6000) {
1433 		volatile unsigned char *ethirq = (unsigned char *) BVME_ETHIRQ_REG;
1434 
1435 		*ethirq = 1;
1436 	}
1437 #endif
1438 
1439 #ifdef ENABLE_MVME16x_NET
1440 	free_irq(0x56, dev);
1441 #endif
1442 	free_irq(dev->irq, dev);
1443 	remove_rx_bufs(dev);
1444 
1445 	return 0;
1446 }
1447 
1448 /*
1449  *    Set or clear the multicast filter for this adaptor.
1450  */
1451 
1452 static void set_multicast_list(struct net_device *dev)
1453 {
1454 	struct i596_private *lp = dev->ml_priv;
1455 	int config = 0, cnt;
1456 
1457 	DEB(DEB_MULTI,printk(KERN_DEBUG "%s: set multicast list, %d entries, promisc %s, allmulti %s\n",
1458 		dev->name, netdev_mc_count(dev),
1459 		dev->flags & IFF_PROMISC  ? "ON" : "OFF",
1460 		dev->flags & IFF_ALLMULTI ? "ON" : "OFF"));
1461 
1462 	if (wait_cfg(dev, &lp->cf_cmd.cmd, 1000, "config change request timed out"))
1463 		return;
1464 
1465 	if ((dev->flags & IFF_PROMISC) && !(lp->cf_cmd.i596_config[8] & 0x01)) {
1466 		lp->cf_cmd.i596_config[8] |= 0x01;
1467 		config = 1;
1468 	}
1469 	if (!(dev->flags & IFF_PROMISC) && (lp->cf_cmd.i596_config[8] & 0x01)) {
1470 		lp->cf_cmd.i596_config[8] &= ~0x01;
1471 		config = 1;
1472 	}
1473 	if ((dev->flags & IFF_ALLMULTI) && (lp->cf_cmd.i596_config[11] & 0x20)) {
1474 		lp->cf_cmd.i596_config[11] &= ~0x20;
1475 		config = 1;
1476 	}
1477 	if (!(dev->flags & IFF_ALLMULTI) && !(lp->cf_cmd.i596_config[11] & 0x20)) {
1478 		lp->cf_cmd.i596_config[11] |= 0x20;
1479 		config = 1;
1480 	}
1481 	if (config) {
1482 		lp->cf_cmd.cmd.command = CmdConfigure;
1483 		i596_add_cmd(dev, &lp->cf_cmd.cmd);
1484 	}
1485 
1486 	cnt = netdev_mc_count(dev);
1487 	if (cnt > MAX_MC_CNT)
1488 	{
1489 		cnt = MAX_MC_CNT;
1490 		printk(KERN_ERR "%s: Only %d multicast addresses supported",
1491 			dev->name, cnt);
1492 	}
1493 
1494 	if (!netdev_mc_empty(dev)) {
1495 		struct netdev_hw_addr *ha;
1496 		unsigned char *cp;
1497 		struct mc_cmd *cmd;
1498 
1499 		if (wait_cfg(dev, &lp->mc_cmd.cmd, 1000, "multicast list change request timed out"))
1500 			return;
1501 		cmd = &lp->mc_cmd;
1502 		cmd->cmd.command = CmdMulticastList;
1503 		cmd->mc_cnt = cnt * ETH_ALEN;
1504 		cp = cmd->mc_addrs;
1505 		netdev_for_each_mc_addr(ha, dev) {
1506 			if (!cnt--)
1507 				break;
1508 			memcpy(cp, ha->addr, ETH_ALEN);
1509 			if (i596_debug > 1)
1510 				DEB(DEB_MULTI,printk(KERN_INFO "%s: Adding address %pM\n",
1511 						dev->name, cp));
1512 			cp += ETH_ALEN;
1513 		}
1514 		i596_add_cmd(dev, &cmd->cmd);
1515 	}
1516 }
1517 
1518 #ifdef MODULE
1519 static struct net_device *dev_82596;
1520 
1521 static int debug = -1;
1522 module_param(debug, int, 0);
1523 MODULE_PARM_DESC(debug, "i82596 debug mask");
1524 
1525 int __init init_module(void)
1526 {
1527 	if (debug >= 0)
1528 		i596_debug = debug;
1529 	dev_82596 = i82596_probe(-1);
1530 	return PTR_ERR_OR_ZERO(dev_82596);
1531 }
1532 
1533 void __exit cleanup_module(void)
1534 {
1535 	unregister_netdev(dev_82596);
1536 #ifdef __mc68000__
1537 	/* XXX This assumes default cache mode to be IOMAP_FULL_CACHING,
1538 	 * XXX which may be invalid (CONFIG_060_WRITETHROUGH)
1539 	 */
1540 
1541 	kernel_set_cachemode((void *)(dev_82596->mem_start), 4096,
1542 			IOMAP_FULL_CACHING);
1543 #endif
1544 	free_page ((u32)(dev_82596->mem_start));
1545 	free_netdev(dev_82596);
1546 }
1547 
1548 #endif				/* MODULE */
1549