1 /*------------------------------------------------------------------------
2  . smc9194.c
3  . This is a driver for SMC's 9000 series of Ethernet cards.
4  .
5  . Copyright (C) 1996 by Erik Stahlman
6  . This software may be used and distributed according to the terms
7  . of the GNU General Public License, incorporated herein by reference.
8  .
9  . "Features" of the SMC chip:
10  .   4608 byte packet memory. ( for the 91C92.  Others have more )
11  .   EEPROM for configuration
12  .   AUI/TP selection  ( mine has 10Base2/10BaseT select )
13  .
14  . Arguments:
15  . 	io		 = for the base address
16  .	irq	 = for the IRQ
17  .	ifport = 0 for autodetect, 1 for TP, 2 for AUI ( or 10base2 )
18  .
19  . author:
20  . 	Erik Stahlman				( erik@vt.edu )
21  . contributors:
22  .      Arnaldo Carvalho de Melo <acme@conectiva.com.br>
23  .
24  . Hardware multicast code from Peter Cammaert ( pc@denkart.be )
25  .
26  . Sources:
27  .    o   SMC databook
28  .    o   skeleton.c by Donald Becker ( becker@scyld.com )
29  .    o   ( a LOT of advice from Becker as well )
30  .
31  . History:
32  .	12/07/95  Erik Stahlman  written, got receive/xmit handled
33  . 	01/03/96  Erik Stahlman  worked out some bugs, actually usable!!! :-)
34  .	01/06/96  Erik Stahlman	 cleaned up some, better testing, etc
35  .	01/29/96  Erik Stahlman	 fixed autoirq, added multicast
36  . 	02/01/96  Erik Stahlman	 1. disabled all interrupts in smc_reset
37  .		   		 2. got rid of post-decrementing bug -- UGH.
38  .	02/13/96  Erik Stahlman  Tried to fix autoirq failure.  Added more
39  .				 descriptive error messages.
40  .	02/15/96  Erik Stahlman  Fixed typo that caused detection failure
41  . 	02/23/96  Erik Stahlman	 Modified it to fit into kernel tree
42  .				 Added support to change hardware address
43  .				 Cleared stats on opens
44  .	02/26/96  Erik Stahlman	 Trial support for Kernel 1.2.13
45  .				 Kludge for automatic IRQ detection
46  .	03/04/96  Erik Stahlman	 Fixed kernel 1.3.70 +
47  .				 Fixed bug reported by Gardner Buchanan in
48  .				   smc_enable, with outw instead of outb
49  .	03/06/96  Erik Stahlman  Added hardware multicast from Peter Cammaert
50  .	04/14/00  Heiko Pruessing (SMA Regelsysteme)  Fixed bug in chip memory
51  .				 allocation
52  .      08/20/00  Arnaldo Melo   fix kfree(skb) in smc_hardware_send_packet
53  .      12/15/00  Christian Jullien fix "Warning: kfree_skb on hard IRQ"
54  .      11/08/01 Matt Domsch     Use common crc32 function
55  ----------------------------------------------------------------------------*/
56 
57 static const char version[] =
58 	"smc9194.c:v0.14 12/15/00 by Erik Stahlman (erik@vt.edu)";
59 
60 #include <linux/module.h>
61 #include <linux/kernel.h>
62 #include <linux/types.h>
63 #include <linux/fcntl.h>
64 #include <linux/interrupt.h>
65 #include <linux/ioport.h>
66 #include <linux/in.h>
67 #include <linux/string.h>
68 #include <linux/init.h>
69 #include <linux/crc32.h>
70 #include <linux/errno.h>
71 #include <linux/netdevice.h>
72 #include <linux/etherdevice.h>
73 #include <linux/skbuff.h>
74 #include <linux/bitops.h>
75 
76 #include <asm/io.h>
77 
78 #include "smc9194.h"
79 
80 #define DRV_NAME "smc9194"
81 
82 /*------------------------------------------------------------------------
83  .
84  . Configuration options, for the experienced user to change.
85  .
86  -------------------------------------------------------------------------*/
87 
88 /*
89  . Do you want to use 32 bit xfers?  This should work on all chips, as
90  . the chipset is designed to accommodate them.
91 */
92 #ifdef __sh__
93 #undef USE_32_BIT
94 #else
95 #define USE_32_BIT 1
96 #endif
97 
98 /*
99  .the SMC9194 can be at any of the following port addresses.  To change,
100  .for a slightly different card, you can add it to the array.  Keep in
101  .mind that the array must end in zero.
102 */
103 
104 struct devlist {
105 	unsigned int port;
106 	unsigned int irq;
107 };
108 
109 static struct devlist smc_devlist[] __initdata = {
110 	{.port = 0x200, .irq = 0},
111 	{.port = 0x220, .irq = 0},
112 	{.port = 0x240, .irq = 0},
113 	{.port = 0x260, .irq = 0},
114 	{.port = 0x280, .irq = 0},
115 	{.port = 0x2A0, .irq = 0},
116 	{.port = 0x2C0, .irq = 0},
117 	{.port = 0x2E0, .irq = 0},
118 	{.port = 0x300, .irq = 0},
119 	{.port = 0x320, .irq = 0},
120 	{.port = 0x340, .irq = 0},
121 	{.port = 0x360, .irq = 0},
122 	{.port = 0x380, .irq = 0},
123 	{.port = 0x3A0, .irq = 0},
124 	{.port = 0x3C0, .irq = 0},
125 	{.port = 0x3E0, .irq = 0},
126 	{.port = 0,     .irq = 0},
127 };
128 /*
129  . Wait time for memory to be free.  This probably shouldn't be
130  . tuned that much, as waiting for this means nothing else happens
131  . in the system
132 */
133 #define MEMORY_WAIT_TIME 16
134 
135 /*
136  . DEBUGGING LEVELS
137  .
138  . 0 for normal operation
139  . 1 for slightly more details
140  . >2 for various levels of increasingly useless information
141  .    2 for interrupt tracking, status flags
142  .    3 for packet dumps, etc.
143 */
144 #define SMC_DEBUG 0
145 
146 #if (SMC_DEBUG > 2 )
147 #define PRINTK3(x) printk x
148 #else
149 #define PRINTK3(x)
150 #endif
151 
152 #if SMC_DEBUG > 1
153 #define PRINTK2(x) printk x
154 #else
155 #define PRINTK2(x)
156 #endif
157 
158 #ifdef SMC_DEBUG
159 #define PRINTK(x) printk x
160 #else
161 #define PRINTK(x)
162 #endif
163 
164 
165 /*------------------------------------------------------------------------
166  .
167  . The internal workings of the driver.  If you are changing anything
168  . here with the SMC stuff, you should have the datasheet and known
169  . what you are doing.
170  .
171  -------------------------------------------------------------------------*/
172 #define CARDNAME "SMC9194"
173 
174 
175 /* store this information for the driver.. */
176 struct smc_local {
177 	/*
178 	   If I have to wait until memory is available to send
179 	   a packet, I will store the skbuff here, until I get the
180 	   desired memory.  Then, I'll send it out and free it.
181 	*/
182 	struct sk_buff * saved_skb;
183 
184 	/*
185  	 . This keeps track of how many packets that I have
186  	 . sent out.  When an TX_EMPTY interrupt comes, I know
187 	 . that all of these have been sent.
188 	*/
189 	int	packets_waiting;
190 };
191 
192 
193 /*-----------------------------------------------------------------
194  .
195  .  The driver can be entered at any of the following entry points.
196  .
197  .------------------------------------------------------------------  */
198 
199 /*
200  . This is called by  register_netdev().  It is responsible for
201  . checking the portlist for the SMC9000 series chipset.  If it finds
202  . one, then it will initialize the device, find the hardware information,
203  . and sets up the appropriate device parameters.
204  . NOTE: Interrupts are *OFF* when this procedure is called.
205  .
206  . NB:This shouldn't be static since it is referred to externally.
207 */
208 struct net_device *smc_init(int unit);
209 
210 /*
211  . The kernel calls this function when someone wants to use the device,
212  . typically 'ifconfig ethX up'.
213 */
214 static int smc_open(struct net_device *dev);
215 
216 /*
217  . Our watchdog timed out. Called by the networking layer
218 */
219 static void smc_timeout(struct net_device *dev);
220 
221 /*
222  . This is called by the kernel in response to 'ifconfig ethX down'.  It
223  . is responsible for cleaning up everything that the open routine
224  . does, and maybe putting the card into a powerdown state.
225 */
226 static int smc_close(struct net_device *dev);
227 
228 /*
229  . Finally, a call to set promiscuous mode ( for TCPDUMP and related
230  . programs ) and multicast modes.
231 */
232 static void smc_set_multicast_list(struct net_device *dev);
233 
234 
235 /*---------------------------------------------------------------
236  .
237  . Interrupt level calls..
238  .
239  ----------------------------------------------------------------*/
240 
241 /*
242  . Handles the actual interrupt
243 */
244 static irqreturn_t smc_interrupt(int irq, void *);
245 /*
246  . This is a separate procedure to handle the receipt of a packet, to
247  . leave the interrupt code looking slightly cleaner
248 */
249 static inline void smc_rcv( struct net_device *dev );
250 /*
251  . This handles a TX interrupt, which is only called when an error
252  . relating to a packet is sent.
253 */
254 static inline void smc_tx( struct net_device * dev );
255 
256 /*
257  ------------------------------------------------------------
258  .
259  . Internal routines
260  .
261  ------------------------------------------------------------
262 */
263 
264 /*
265  . Test if a given location contains a chip, trying to cause as
266  . little damage as possible if it's not a SMC chip.
267 */
268 static int smc_probe(struct net_device *dev, int ioaddr);
269 
270 /*
271  . A rather simple routine to print out a packet for debugging purposes.
272 */
273 #if SMC_DEBUG > 2
274 static void print_packet( byte *, int );
275 #endif
276 
277 #define tx_done(dev) 1
278 
279 /* this is called to actually send the packet to the chip */
280 static void smc_hardware_send_packet( struct net_device * dev );
281 
282 /* Since I am not sure if I will have enough room in the chip's ram
283  . to store the packet, I call this routine, which either sends it
284  . now, or generates an interrupt when the card is ready for the
285  . packet */
286 static netdev_tx_t  smc_wait_to_send_packet( struct sk_buff * skb,
287 					     struct net_device *dev );
288 
289 /* this does a soft reset on the device */
290 static void smc_reset( int ioaddr );
291 
292 /* Enable Interrupts, Receive, and Transmit */
293 static void smc_enable( int ioaddr );
294 
295 /* this puts the device in an inactive state */
296 static void smc_shutdown( int ioaddr );
297 
298 /* This routine will find the IRQ of the driver if one is not
299  . specified in the input to the device.  */
300 static int smc_findirq( int ioaddr );
301 
302 /*
303  . Function: smc_reset( int ioaddr )
304  . Purpose:
305  .  	This sets the SMC91xx chip to its normal state, hopefully from whatever
306  . 	mess that any other DOS driver has put it in.
307  .
308  . Maybe I should reset more registers to defaults in here?  SOFTRESET  should
309  . do that for me.
310  .
311  . Method:
312  .	1.  send a SOFT RESET
313  .	2.  wait for it to finish
314  .	3.  enable autorelease mode
315  .	4.  reset the memory management unit
316  .	5.  clear all interrupts
317  .
318 */
319 static void smc_reset( int ioaddr )
320 {
321 	/* This resets the registers mostly to defaults, but doesn't
322 	   affect EEPROM.  That seems unnecessary */
323 	SMC_SELECT_BANK( 0 );
324 	outw( RCR_SOFTRESET, ioaddr + RCR );
325 
326 	/* this should pause enough for the chip to be happy */
327 	SMC_DELAY( );
328 
329 	/* Set the transmit and receive configuration registers to
330 	   default values */
331 	outw( RCR_CLEAR, ioaddr + RCR );
332 	outw( TCR_CLEAR, ioaddr + TCR );
333 
334 	/* set the control register to automatically
335 	   release successfully transmitted packets, to make the best
336 	   use out of our limited memory */
337 	SMC_SELECT_BANK( 1 );
338 	outw( inw( ioaddr + CONTROL ) | CTL_AUTO_RELEASE , ioaddr + CONTROL );
339 
340 	/* Reset the MMU */
341 	SMC_SELECT_BANK( 2 );
342 	outw( MC_RESET, ioaddr + MMU_CMD );
343 
344 	/* Note:  It doesn't seem that waiting for the MMU busy is needed here,
345 	   but this is a place where future chipsets _COULD_ break.  Be wary
346  	   of issuing another MMU command right after this */
347 
348 	outb( 0, ioaddr + INT_MASK );
349 }
350 
351 /*
352  . Function: smc_enable
353  . Purpose: let the chip talk to the outside work
354  . Method:
355  .	1.  Enable the transmitter
356  .	2.  Enable the receiver
357  .	3.  Enable interrupts
358 */
359 static void smc_enable( int ioaddr )
360 {
361 	SMC_SELECT_BANK( 0 );
362 	/* see the header file for options in TCR/RCR NORMAL*/
363 	outw( TCR_NORMAL, ioaddr + TCR );
364 	outw( RCR_NORMAL, ioaddr + RCR );
365 
366 	/* now, enable interrupts */
367 	SMC_SELECT_BANK( 2 );
368 	outb( SMC_INTERRUPT_MASK, ioaddr + INT_MASK );
369 }
370 
371 /*
372  . Function: smc_shutdown
373  . Purpose:  closes down the SMC91xxx chip.
374  . Method:
375  .	1. zero the interrupt mask
376  .	2. clear the enable receive flag
377  .	3. clear the enable xmit flags
378  .
379  . TODO:
380  .   (1) maybe utilize power down mode.
381  .	Why not yet?  Because while the chip will go into power down mode,
382  .	the manual says that it will wake up in response to any I/O requests
383  .	in the register space.   Empirical results do not show this working.
384 */
385 static void smc_shutdown( int ioaddr )
386 {
387 	/* no more interrupts for me */
388 	SMC_SELECT_BANK( 2 );
389 	outb( 0, ioaddr + INT_MASK );
390 
391 	/* and tell the card to stay away from that nasty outside world */
392 	SMC_SELECT_BANK( 0 );
393 	outb( RCR_CLEAR, ioaddr + RCR );
394 	outb( TCR_CLEAR, ioaddr + TCR );
395 #if 0
396 	/* finally, shut the chip down */
397 	SMC_SELECT_BANK( 1 );
398 	outw( inw( ioaddr + CONTROL ), CTL_POWERDOWN, ioaddr + CONTROL  );
399 #endif
400 }
401 
402 
403 /*
404  . Function: smc_setmulticast( int ioaddr, struct net_device *dev )
405  . Purpose:
406  .    This sets the internal hardware table to filter out unwanted multicast
407  .    packets before they take up memory.
408  .
409  .    The SMC chip uses a hash table where the high 6 bits of the CRC of
410  .    address are the offset into the table.  If that bit is 1, then the
411  .    multicast packet is accepted.  Otherwise, it's dropped silently.
412  .
413  .    To use the 6 bits as an offset into the table, the high 3 bits are the
414  .    number of the 8 bit register, while the low 3 bits are the bit within
415  .    that register.
416  .
417  . This routine is based very heavily on the one provided by Peter Cammaert.
418 */
419 
420 
421 static void smc_setmulticast(int ioaddr, struct net_device *dev)
422 {
423 	int			i;
424 	unsigned char		multicast_table[ 8 ];
425 	struct netdev_hw_addr *ha;
426 	/* table for flipping the order of 3 bits */
427 	unsigned char invert3[] = { 0, 4, 2, 6, 1, 5, 3, 7 };
428 
429 	/* start with a table of all zeros: reject all */
430 	memset( multicast_table, 0, sizeof( multicast_table ) );
431 
432 	netdev_for_each_mc_addr(ha, dev) {
433 		int position;
434 
435 		/* only use the low order bits */
436 		position = ether_crc_le(6, ha->addr) & 0x3f;
437 
438 		/* do some messy swapping to put the bit in the right spot */
439 		multicast_table[invert3[position&7]] |=
440 					(1<<invert3[(position>>3)&7]);
441 
442 	}
443 	/* now, the table can be loaded into the chipset */
444 	SMC_SELECT_BANK( 3 );
445 
446 	for ( i = 0; i < 8 ; i++ ) {
447 		outb( multicast_table[i], ioaddr + MULTICAST1 + i );
448 	}
449 }
450 
451 /*
452  . Function: smc_wait_to_send_packet( struct sk_buff * skb, struct net_device * )
453  . Purpose:
454  .    Attempt to allocate memory for a packet, if chip-memory is not
455  .    available, then tell the card to generate an interrupt when it
456  .    is available.
457  .
458  . Algorithm:
459  .
460  . o	if the saved_skb is not currently null, then drop this packet
461  .	on the floor.  This should never happen, because of TBUSY.
462  . o	if the saved_skb is null, then replace it with the current packet,
463  . o	See if I can sending it now.
464  . o 	(NO): Enable interrupts and let the interrupt handler deal with it.
465  . o	(YES):Send it now.
466 */
467 static netdev_tx_t smc_wait_to_send_packet(struct sk_buff *skb,
468 					   struct net_device *dev)
469 {
470 	struct smc_local *lp = netdev_priv(dev);
471 	unsigned int ioaddr 	= dev->base_addr;
472 	word 			length;
473 	unsigned short 		numPages;
474 	word			time_out;
475 
476 	netif_stop_queue(dev);
477 	/* Well, I want to send the packet.. but I don't know
478 	   if I can send it right now...  */
479 
480 	if ( lp->saved_skb) {
481 		/* THIS SHOULD NEVER HAPPEN. */
482 		dev->stats.tx_aborted_errors++;
483 		printk(CARDNAME": Bad Craziness - sent packet while busy.\n" );
484 		return NETDEV_TX_BUSY;
485 	}
486 	lp->saved_skb = skb;
487 
488 	length = skb->len;
489 
490 	if (length < ETH_ZLEN) {
491 		if (skb_padto(skb, ETH_ZLEN)) {
492 			netif_wake_queue(dev);
493 			return NETDEV_TX_OK;
494 		}
495 		length = ETH_ZLEN;
496 	}
497 
498 	/*
499 	** The MMU wants the number of pages to be the number of 256 bytes
500 	** 'pages', minus 1 ( since a packet can't ever have 0 pages :) )
501 	**
502 	** Pkt size for allocating is data length +6 (for additional status words,
503 	** length and ctl!) If odd size last byte is included in this header.
504 	*/
505 	numPages =  ((length & 0xfffe) + 6) / 256;
506 
507 	if (numPages > 7 ) {
508 		printk(CARDNAME": Far too big packet error.\n");
509 		/* freeing the packet is a good thing here... but should
510 		 . any packets of this size get down here?   */
511 		dev_kfree_skb (skb);
512 		lp->saved_skb = NULL;
513 		/* this IS an error, but, i don't want the skb saved */
514 		netif_wake_queue(dev);
515 		return NETDEV_TX_OK;
516 	}
517 	/* either way, a packet is waiting now */
518 	lp->packets_waiting++;
519 
520 	/* now, try to allocate the memory */
521 	SMC_SELECT_BANK( 2 );
522 	outw( MC_ALLOC | numPages, ioaddr + MMU_CMD );
523 	/*
524  	. Performance Hack
525 	.
526  	. wait a short amount of time.. if I can send a packet now, I send
527 	. it now.  Otherwise, I enable an interrupt and wait for one to be
528 	. available.
529 	.
530 	. I could have handled this a slightly different way, by checking to
531 	. see if any memory was available in the FREE MEMORY register.  However,
532 	. either way, I need to generate an allocation, and the allocation works
533 	. no matter what, so I saw no point in checking free memory.
534 	*/
535 	time_out = MEMORY_WAIT_TIME;
536 	do {
537 		word	status;
538 
539 		status = inb( ioaddr + INTERRUPT );
540 		if ( status & IM_ALLOC_INT ) {
541 			/* acknowledge the interrupt */
542 			outb( IM_ALLOC_INT, ioaddr + INTERRUPT );
543   			break;
544 		}
545    	} while ( -- time_out );
546 
547    	if ( !time_out ) {
548 		/* oh well, wait until the chip finds memory later */
549 		SMC_ENABLE_INT( IM_ALLOC_INT );
550 		PRINTK2((CARDNAME": memory allocation deferred.\n"));
551 		/* it's deferred, but I'll handle it later */
552 		return NETDEV_TX_OK;
553    	}
554 	/* or YES! I can send the packet now.. */
555 	smc_hardware_send_packet(dev);
556 	netif_wake_queue(dev);
557 	return NETDEV_TX_OK;
558 }
559 
560 /*
561  . Function:  smc_hardware_send_packet(struct net_device * )
562  . Purpose:
563  .	This sends the actual packet to the SMC9xxx chip.
564  .
565  . Algorithm:
566  . 	First, see if a saved_skb is available.
567  .		( this should NOT be called if there is no 'saved_skb'
568  .	Now, find the packet number that the chip allocated
569  .	Point the data pointers at it in memory
570  .	Set the length word in the chip's memory
571  .	Dump the packet to chip memory
572  .	Check if a last byte is needed ( odd length packet )
573  .		if so, set the control flag right
574  . 	Tell the card to send it
575  .	Enable the transmit interrupt, so I know if it failed
576  . 	Free the kernel data if I actually sent it.
577 */
578 static void smc_hardware_send_packet( struct net_device * dev )
579 {
580 	struct smc_local *lp = netdev_priv(dev);
581 	byte	 		packet_no;
582 	struct sk_buff * 	skb = lp->saved_skb;
583 	word			length;
584 	unsigned int		ioaddr;
585 	byte			* buf;
586 
587 	ioaddr = dev->base_addr;
588 
589 	if ( !skb ) {
590 		PRINTK((CARDNAME": In XMIT with no packet to send\n"));
591 		return;
592 	}
593 	length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
594 	buf = skb->data;
595 
596 	/* If I get here, I _know_ there is a packet slot waiting for me */
597 	packet_no = inb( ioaddr + PNR_ARR + 1 );
598 	if ( packet_no & 0x80 ) {
599 		/* or isn't there?  BAD CHIP! */
600 		netdev_dbg(dev, CARDNAME": Memory allocation failed.\n");
601 		dev_kfree_skb_any(skb);
602 		lp->saved_skb = NULL;
603 		netif_wake_queue(dev);
604 		return;
605 	}
606 
607 	/* we have a packet address, so tell the card to use it */
608 	outb( packet_no, ioaddr + PNR_ARR );
609 
610 	/* point to the beginning of the packet */
611 	outw( PTR_AUTOINC , ioaddr + POINTER );
612 
613 	PRINTK3((CARDNAME": Trying to xmit packet of length %x\n", length));
614 #if SMC_DEBUG > 2
615 	print_packet( buf, length );
616 #endif
617 
618 	/* send the packet length ( +6 for status, length and ctl byte )
619  	   and the status word ( set to zeros ) */
620 #ifdef USE_32_BIT
621 	outl(  (length +6 ) << 16 , ioaddr + DATA_1 );
622 #else
623 	outw( 0, ioaddr + DATA_1 );
624 	/* send the packet length ( +6 for status words, length, and ctl*/
625 	outb( (length+6) & 0xFF,ioaddr + DATA_1 );
626 	outb( (length+6) >> 8 , ioaddr + DATA_1 );
627 #endif
628 
629 	/* send the actual data
630 	 . I _think_ it's faster to send the longs first, and then
631 	 . mop up by sending the last word.  It depends heavily
632  	 . on alignment, at least on the 486.  Maybe it would be
633  	 . a good idea to check which is optimal?  But that could take
634 	 . almost as much time as is saved?
635 	*/
636 #ifdef USE_32_BIT
637 	if ( length & 0x2  ) {
638 		outsl(ioaddr + DATA_1, buf,  length >> 2 );
639 		outw( *((word *)(buf + (length & 0xFFFFFFFC))),ioaddr +DATA_1);
640 	}
641 	else
642 		outsl(ioaddr + DATA_1, buf,  length >> 2 );
643 #else
644 	outsw(ioaddr + DATA_1 , buf, (length ) >> 1);
645 #endif
646 	/* Send the last byte, if there is one.   */
647 
648 	if ( (length & 1) == 0 ) {
649 		outw( 0, ioaddr + DATA_1 );
650 	} else {
651 		outb( buf[length -1 ], ioaddr + DATA_1 );
652 		outb( 0x20, ioaddr + DATA_1);
653 	}
654 
655 	/* enable the interrupts */
656 	SMC_ENABLE_INT( (IM_TX_INT | IM_TX_EMPTY_INT) );
657 
658 	/* and let the chipset deal with it */
659 	outw( MC_ENQUEUE , ioaddr + MMU_CMD );
660 
661 	PRINTK2((CARDNAME": Sent packet of length %d\n", length));
662 
663 	lp->saved_skb = NULL;
664 	dev_kfree_skb_any (skb);
665 
666 	netif_trans_update(dev);
667 
668 	/* we can send another packet */
669 	netif_wake_queue(dev);
670 }
671 
672 /*-------------------------------------------------------------------------
673  |
674  | smc_init(int unit)
675  |   Input parameters:
676  |	dev->base_addr == 0, try to find all possible locations
677  |	dev->base_addr == 1, return failure code
678  |	dev->base_addr == 2, always allocate space,  and return success
679  |	dev->base_addr == <anything else>   this is the address to check
680  |
681  |   Output:
682  |	pointer to net_device or ERR_PTR(error)
683  |
684  ---------------------------------------------------------------------------
685 */
686 static int io;
687 static int irq;
688 static int ifport;
689 
690 struct net_device * __init smc_init(int unit)
691 {
692 	struct net_device *dev = alloc_etherdev(sizeof(struct smc_local));
693 	struct devlist *smcdev = smc_devlist;
694 	int err = 0;
695 
696 	if (!dev)
697 		return ERR_PTR(-ENODEV);
698 
699 	if (unit >= 0) {
700 		sprintf(dev->name, "eth%d", unit);
701 		netdev_boot_setup_check(dev);
702 		io = dev->base_addr;
703 		irq = dev->irq;
704 	}
705 
706 	if (io > 0x1ff) {	/* Check a single specified location. */
707 		err = smc_probe(dev, io);
708 	} else if (io != 0) {	/* Don't probe at all. */
709 		err = -ENXIO;
710 	} else {
711 		for (;smcdev->port; smcdev++) {
712 			if (smc_probe(dev, smcdev->port) == 0)
713 				break;
714 		}
715 		if (!smcdev->port)
716 			err = -ENODEV;
717 	}
718 	if (err)
719 		goto out;
720 	err = register_netdev(dev);
721 	if (err)
722 		goto out1;
723 	return dev;
724 out1:
725 	free_irq(dev->irq, dev);
726 	release_region(dev->base_addr, SMC_IO_EXTENT);
727 out:
728 	free_netdev(dev);
729 	return ERR_PTR(err);
730 }
731 
732 /*----------------------------------------------------------------------
733  . smc_findirq
734  .
735  . This routine has a simple purpose -- make the SMC chip generate an
736  . interrupt, so an auto-detect routine can detect it, and find the IRQ,
737  ------------------------------------------------------------------------
738 */
739 static int __init smc_findirq(int ioaddr)
740 {
741 #ifndef NO_AUTOPROBE
742 	int	timeout = 20;
743 	unsigned long cookie;
744 
745 
746 	cookie = probe_irq_on();
747 
748 	/*
749 	 * What I try to do here is trigger an ALLOC_INT. This is done
750 	 * by allocating a small chunk of memory, which will give an interrupt
751 	 * when done.
752 	 */
753 
754 
755 	SMC_SELECT_BANK(2);
756 	/* enable ALLOCation interrupts ONLY */
757 	outb( IM_ALLOC_INT, ioaddr + INT_MASK );
758 
759 	/*
760  	 . Allocate 512 bytes of memory.  Note that the chip was just
761 	 . reset so all the memory is available
762 	*/
763 	outw( MC_ALLOC | 1, ioaddr + MMU_CMD );
764 
765 	/*
766 	 . Wait until positive that the interrupt has been generated
767 	*/
768 	while ( timeout ) {
769 		byte	int_status;
770 
771 		int_status = inb( ioaddr + INTERRUPT );
772 
773 		if ( int_status & IM_ALLOC_INT )
774 			break;		/* got the interrupt */
775 		timeout--;
776 	}
777 	/* there is really nothing that I can do here if timeout fails,
778 	   as probe_irq_off will return a 0 anyway, which is what I
779 	   want in this case.   Plus, the clean up is needed in both
780 	   cases.  */
781 
782 	/* DELAY HERE!
783 	   On a fast machine, the status might change before the interrupt
784 	   is given to the processor.  This means that the interrupt was
785 	   never detected, and probe_irq_off fails to report anything.
786 	   This should fix probe_irq_* problems.
787 	*/
788 	SMC_DELAY();
789 	SMC_DELAY();
790 
791 	/* and disable all interrupts again */
792 	outb( 0, ioaddr + INT_MASK );
793 
794 	/* and return what I found */
795 	return probe_irq_off(cookie);
796 #else /* NO_AUTOPROBE */
797 	struct devlist *smcdev;
798 	for (smcdev = smc_devlist; smcdev->port; smcdev++) {
799 		if (smcdev->port == ioaddr)
800 			return smcdev->irq;
801 	}
802 	return 0;
803 #endif
804 }
805 
806 static const struct net_device_ops smc_netdev_ops = {
807 	.ndo_open		 = smc_open,
808 	.ndo_stop		= smc_close,
809 	.ndo_start_xmit    	= smc_wait_to_send_packet,
810 	.ndo_tx_timeout	    	= smc_timeout,
811 	.ndo_set_rx_mode	= smc_set_multicast_list,
812 	.ndo_set_mac_address 	= eth_mac_addr,
813 	.ndo_validate_addr	= eth_validate_addr,
814 };
815 
816 /*----------------------------------------------------------------------
817  . Function: smc_probe( int ioaddr )
818  .
819  . Purpose:
820  .	Tests to see if a given ioaddr points to an SMC9xxx chip.
821  .	Returns a 0 on success
822  .
823  . Algorithm:
824  .	(1) see if the high byte of BANK_SELECT is 0x33
825  . 	(2) compare the ioaddr with the base register's address
826  .	(3) see if I recognize the chip ID in the appropriate register
827  .
828  .---------------------------------------------------------------------
829  */
830 
831 /*---------------------------------------------------------------
832  . Here I do typical initialization tasks.
833  .
834  . o  Initialize the structure if needed
835  . o  print out my vanity message if not done so already
836  . o  print out what type of hardware is detected
837  . o  print out the ethernet address
838  . o  find the IRQ
839  . o  set up my private data
840  . o  configure the dev structure with my subroutines
841  . o  actually GRAB the irq.
842  . o  GRAB the region
843  .-----------------------------------------------------------------
844 */
845 static int __init smc_probe(struct net_device *dev, int ioaddr)
846 {
847 	int i, memory, retval;
848 	unsigned int bank;
849 
850 	const char *version_string;
851 	const char *if_string;
852 
853 	/* registers */
854 	word revision_register;
855 	word base_address_register;
856 	word configuration_register;
857 	word memory_info_register;
858 	word memory_cfg_register;
859 
860 	/* Grab the region so that no one else tries to probe our ioports. */
861 	if (!request_region(ioaddr, SMC_IO_EXTENT, DRV_NAME))
862 		return -EBUSY;
863 
864 	dev->irq = irq;
865 	dev->if_port = ifport;
866 
867 	/* First, see if the high byte is 0x33 */
868 	bank = inw( ioaddr + BANK_SELECT );
869 	if ( (bank & 0xFF00) != 0x3300 ) {
870 		retval = -ENODEV;
871 		goto err_out;
872 	}
873 	/* The above MIGHT indicate a device, but I need to write to further
874  	 	test this.  */
875 	outw( 0x0, ioaddr + BANK_SELECT );
876 	bank = inw( ioaddr + BANK_SELECT );
877 	if ( (bank & 0xFF00 ) != 0x3300 ) {
878 		retval = -ENODEV;
879 		goto err_out;
880 	}
881 	/* well, we've already written once, so hopefully another time won't
882  	   hurt.  This time, I need to switch the bank register to bank 1,
883 	   so I can access the base address register */
884 	SMC_SELECT_BANK(1);
885 	base_address_register = inw( ioaddr + BASE );
886 	if ( ioaddr != ( base_address_register >> 3 & 0x3E0 ) )  {
887 		printk(CARDNAME ": IOADDR %x doesn't match configuration (%x). "
888 			"Probably not a SMC chip\n",
889 			ioaddr, base_address_register >> 3 & 0x3E0 );
890 		/* well, the base address register didn't match.  Must not have
891 		   been a SMC chip after all. */
892 		retval = -ENODEV;
893 		goto err_out;
894 	}
895 
896 	/*  check if the revision register is something that I recognize.
897 	    These might need to be added to later, as future revisions
898 	    could be added.  */
899 	SMC_SELECT_BANK(3);
900 	revision_register  = inw( ioaddr + REVISION );
901 	if ( !chip_ids[ ( revision_register  >> 4 ) & 0xF  ] ) {
902 		/* I don't recognize this chip, so... */
903 		printk(CARDNAME ": IO %x: Unrecognized revision register:"
904 			" %x, Contact author.\n", ioaddr, revision_register);
905 
906 		retval = -ENODEV;
907 		goto err_out;
908 	}
909 
910 	/* at this point I'll assume that the chip is an SMC9xxx.
911 	   It might be prudent to check a listing of MAC addresses
912 	   against the hardware address, or do some other tests. */
913 
914 	pr_info_once("%s\n", version);
915 
916 	/* fill in some of the fields */
917 	dev->base_addr = ioaddr;
918 
919 	/*
920  	 . Get the MAC address ( bank 1, regs 4 - 9 )
921 	*/
922 	SMC_SELECT_BANK( 1 );
923 	for ( i = 0; i < 6; i += 2 ) {
924 		word	address;
925 
926 		address = inw( ioaddr + ADDR0 + i  );
927 		dev->dev_addr[ i + 1] = address >> 8;
928 		dev->dev_addr[ i ] = address & 0xFF;
929 	}
930 
931 	/* get the memory information */
932 
933 	SMC_SELECT_BANK( 0 );
934 	memory_info_register = inw( ioaddr + MIR );
935 	memory_cfg_register  = inw( ioaddr + MCR );
936 	memory = ( memory_cfg_register >> 9 )  & 0x7;  /* multiplier */
937 	memory *= 256 * ( memory_info_register & 0xFF );
938 
939 	/*
940 	 Now, I want to find out more about the chip.  This is sort of
941  	 redundant, but it's cleaner to have it in both, rather than having
942  	 one VERY long probe procedure.
943 	*/
944 	SMC_SELECT_BANK(3);
945 	revision_register  = inw( ioaddr + REVISION );
946 	version_string = chip_ids[ ( revision_register  >> 4 ) & 0xF  ];
947 	if ( !version_string ) {
948 		/* I shouldn't get here because this call was done before.... */
949 		retval = -ENODEV;
950 		goto err_out;
951 	}
952 
953 	/* is it using AUI or 10BaseT ? */
954 	if ( dev->if_port == 0 ) {
955 		SMC_SELECT_BANK(1);
956 		configuration_register = inw( ioaddr + CONFIG );
957 		if ( configuration_register & CFG_AUI_SELECT )
958 			dev->if_port = 2;
959 		else
960 			dev->if_port = 1;
961 	}
962 	if_string = interfaces[ dev->if_port - 1 ];
963 
964 	/* now, reset the chip, and put it into a known state */
965 	smc_reset( ioaddr );
966 
967 	/*
968 	 . If dev->irq is 0, then the device has to be banged on to see
969 	 . what the IRQ is.
970  	 .
971 	 . This banging doesn't always detect the IRQ, for unknown reasons.
972 	 . a workaround is to reset the chip and try again.
973 	 .
974 	 . Interestingly, the DOS packet driver *SETS* the IRQ on the card to
975 	 . be what is requested on the command line.   I don't do that, mostly
976 	 . because the card that I have uses a non-standard method of accessing
977 	 . the IRQs, and because this _should_ work in most configurations.
978 	 .
979 	 . Specifying an IRQ is done with the assumption that the user knows
980 	 . what (s)he is doing.  No checking is done!!!!
981  	 .
982 	*/
983 	if ( dev->irq < 2 ) {
984 		int	trials;
985 
986 		trials = 3;
987 		while ( trials-- ) {
988 			dev->irq = smc_findirq( ioaddr );
989 			if ( dev->irq )
990 				break;
991 			/* kick the card and try again */
992 			smc_reset( ioaddr );
993 		}
994 	}
995 	if (dev->irq == 0 ) {
996 		printk(CARDNAME": Couldn't autodetect your IRQ. Use irq=xx.\n");
997 		retval = -ENODEV;
998 		goto err_out;
999 	}
1000 
1001 	/* now, print out the card info, in a short format.. */
1002 
1003 	netdev_info(dev, "%s(r:%d) at %#3x IRQ:%d INTF:%s MEM:%db ",
1004 		    version_string, revision_register & 0xF, ioaddr, dev->irq,
1005 		    if_string, memory);
1006 	/*
1007 	 . Print the Ethernet address
1008 	*/
1009 	netdev_info(dev, "ADDR: %pM\n", dev->dev_addr);
1010 
1011 	/* Grab the IRQ */
1012 	retval = request_irq(dev->irq, smc_interrupt, 0, DRV_NAME, dev);
1013 	if (retval) {
1014 		netdev_warn(dev, "%s: unable to get IRQ %d (irqval=%d).\n",
1015 			    DRV_NAME, dev->irq, retval);
1016 		goto err_out;
1017 	}
1018 
1019 	dev->netdev_ops			= &smc_netdev_ops;
1020 	dev->watchdog_timeo		= HZ/20;
1021 
1022 	return 0;
1023 
1024 err_out:
1025 	release_region(ioaddr, SMC_IO_EXTENT);
1026 	return retval;
1027 }
1028 
1029 #if SMC_DEBUG > 2
1030 static void print_packet( byte * buf, int length )
1031 {
1032 #if 0
1033 	print_hex_dump_debug(DRV_NAME, DUMP_PREFIX_OFFSET, 16, 1,
1034 			     buf, length, true);
1035 #endif
1036 }
1037 #endif
1038 
1039 
1040 /*
1041  * Open and Initialize the board
1042  *
1043  * Set up everything, reset the card, etc ..
1044  *
1045  */
1046 static int smc_open(struct net_device *dev)
1047 {
1048 	int	ioaddr = dev->base_addr;
1049 
1050 	int	i;	/* used to set hw ethernet address */
1051 
1052 	/* clear out all the junk that was put here before... */
1053 	memset(netdev_priv(dev), 0, sizeof(struct smc_local));
1054 
1055 	/* reset the hardware */
1056 
1057 	smc_reset( ioaddr );
1058 	smc_enable( ioaddr );
1059 
1060 	/* Select which interface to use */
1061 
1062 	SMC_SELECT_BANK( 1 );
1063 	if ( dev->if_port == 1 ) {
1064 		outw( inw( ioaddr + CONFIG ) & ~CFG_AUI_SELECT,
1065 			ioaddr + CONFIG );
1066 	}
1067 	else if ( dev->if_port == 2 ) {
1068 		outw( inw( ioaddr + CONFIG ) | CFG_AUI_SELECT,
1069 			ioaddr + CONFIG );
1070 	}
1071 
1072 	/*
1073   		According to Becker, I have to set the hardware address
1074 		at this point, because the (l)user can set it with an
1075 		ioctl.  Easily done...
1076 	*/
1077 	SMC_SELECT_BANK( 1 );
1078 	for ( i = 0; i < 6; i += 2 ) {
1079 		word	address;
1080 
1081 		address = dev->dev_addr[ i + 1 ] << 8 ;
1082 		address  |= dev->dev_addr[ i ];
1083 		outw( address, ioaddr + ADDR0 + i );
1084 	}
1085 
1086 	netif_start_queue(dev);
1087 	return 0;
1088 }
1089 
1090 /*--------------------------------------------------------
1091  . Called by the kernel to send a packet out into the void
1092  . of the net.  This routine is largely based on
1093  . skeleton.c, from Becker.
1094  .--------------------------------------------------------
1095 */
1096 
1097 static void smc_timeout(struct net_device *dev)
1098 {
1099 	/* If we get here, some higher level has decided we are broken.
1100 	   There should really be a "kick me" function call instead. */
1101 	netdev_warn(dev, CARDNAME": transmit timed out, %s?\n",
1102 		    tx_done(dev) ? "IRQ conflict" : "network cable problem");
1103 	/* "kick" the adaptor */
1104 	smc_reset( dev->base_addr );
1105 	smc_enable( dev->base_addr );
1106 	netif_trans_update(dev); /* prevent tx timeout */
1107 	/* clear anything saved */
1108 	((struct smc_local *)netdev_priv(dev))->saved_skb = NULL;
1109 	netif_wake_queue(dev);
1110 }
1111 
1112 /*-------------------------------------------------------------
1113  .
1114  . smc_rcv -  receive a packet from the card
1115  .
1116  . There is ( at least ) a packet waiting to be read from
1117  . chip-memory.
1118  .
1119  . o Read the status
1120  . o If an error, record it
1121  . o otherwise, read in the packet
1122  --------------------------------------------------------------
1123 */
1124 static void smc_rcv(struct net_device *dev)
1125 {
1126 	int 	ioaddr = dev->base_addr;
1127 	int 	packet_number;
1128 	word	status;
1129 	word	packet_length;
1130 
1131 	/* assume bank 2 */
1132 
1133 	packet_number = inw( ioaddr + FIFO_PORTS );
1134 
1135 	if ( packet_number & FP_RXEMPTY ) {
1136 		/* we got called , but nothing was on the FIFO */
1137 		PRINTK((CARDNAME ": WARNING: smc_rcv with nothing on FIFO.\n"));
1138 		/* don't need to restore anything */
1139 		return;
1140 	}
1141 
1142 	/*  start reading from the start of the packet */
1143 	outw( PTR_READ | PTR_RCV | PTR_AUTOINC, ioaddr + POINTER );
1144 
1145 	/* First two words are status and packet_length */
1146 	status 		= inw( ioaddr + DATA_1 );
1147 	packet_length 	= inw( ioaddr + DATA_1 );
1148 
1149 	packet_length &= 0x07ff;  /* mask off top bits */
1150 
1151 	PRINTK2(("RCV: STATUS %4x LENGTH %4x\n", status, packet_length ));
1152 	/*
1153 	 . the packet length contains 3 extra words :
1154 	 . status, length, and an extra word with an odd byte .
1155 	*/
1156 	packet_length -= 6;
1157 
1158 	if ( !(status & RS_ERRORS ) ){
1159 		/* do stuff to make a new packet */
1160 		struct sk_buff  * skb;
1161 		byte		* data;
1162 
1163 		/* read one extra byte */
1164 		if ( status & RS_ODDFRAME )
1165 			packet_length++;
1166 
1167 		/* set multicast stats */
1168 		if ( status & RS_MULTICAST )
1169 			dev->stats.multicast++;
1170 
1171 		skb = netdev_alloc_skb(dev, packet_length + 5);
1172 		if ( skb == NULL ) {
1173 			dev->stats.rx_dropped++;
1174 			goto done;
1175 		}
1176 
1177 		/*
1178 		 ! This should work without alignment, but it could be
1179 		 ! in the worse case
1180 		*/
1181 
1182 		skb_reserve( skb, 2 );   /* 16 bit alignment */
1183 
1184 		data = skb_put( skb, packet_length);
1185 
1186 #ifdef USE_32_BIT
1187 		/* QUESTION:  Like in the TX routine, do I want
1188 		   to send the DWORDs or the bytes first, or some
1189 		   mixture.  A mixture might improve already slow PIO
1190 		   performance  */
1191 		PRINTK3((" Reading %d dwords (and %d bytes)\n",
1192 			packet_length >> 2, packet_length & 3 ));
1193 		insl(ioaddr + DATA_1 , data, packet_length >> 2 );
1194 		/* read the left over bytes */
1195 		insb( ioaddr + DATA_1, data + (packet_length & 0xFFFFFC),
1196 			packet_length & 0x3  );
1197 #else
1198 		PRINTK3((" Reading %d words and %d byte(s)\n",
1199 			(packet_length >> 1 ), packet_length & 1 ));
1200 		insw(ioaddr + DATA_1 , data, packet_length >> 1);
1201 		if ( packet_length & 1 ) {
1202 			data += packet_length & ~1;
1203 			*(data++) = inb( ioaddr + DATA_1 );
1204 		}
1205 #endif
1206 #if	SMC_DEBUG > 2
1207 			print_packet( data, packet_length );
1208 #endif
1209 
1210 		skb->protocol = eth_type_trans(skb, dev );
1211 		netif_rx(skb);
1212 		dev->stats.rx_packets++;
1213 		dev->stats.rx_bytes += packet_length;
1214 	} else {
1215 		/* error ... */
1216 		dev->stats.rx_errors++;
1217 
1218 		if ( status & RS_ALGNERR )  dev->stats.rx_frame_errors++;
1219 		if ( status & (RS_TOOSHORT | RS_TOOLONG ) )
1220 			dev->stats.rx_length_errors++;
1221 		if ( status & RS_BADCRC)	dev->stats.rx_crc_errors++;
1222 	}
1223 
1224 done:
1225 	/*  error or good, tell the card to get rid of this packet */
1226 	outw( MC_RELEASE, ioaddr + MMU_CMD );
1227 }
1228 
1229 
1230 /*************************************************************************
1231  . smc_tx
1232  .
1233  . Purpose:  Handle a transmit error message.   This will only be called
1234  .   when an error, because of the AUTO_RELEASE mode.
1235  .
1236  . Algorithm:
1237  .	Save pointer and packet no
1238  .	Get the packet no from the top of the queue
1239  .	check if it's valid ( if not, is this an error??? )
1240  .	read the status word
1241  .	record the error
1242  .	( resend?  Not really, since we don't want old packets around )
1243  .	Restore saved values
1244  ************************************************************************/
1245 static void smc_tx( struct net_device * dev )
1246 {
1247 	int	ioaddr = dev->base_addr;
1248 	struct smc_local *lp = netdev_priv(dev);
1249 	byte saved_packet;
1250 	byte packet_no;
1251 	word tx_status;
1252 
1253 
1254 	/* assume bank 2  */
1255 
1256 	saved_packet = inb( ioaddr + PNR_ARR );
1257 	packet_no = inw( ioaddr + FIFO_PORTS );
1258 	packet_no &= 0x7F;
1259 
1260 	/* select this as the packet to read from */
1261 	outb( packet_no, ioaddr + PNR_ARR );
1262 
1263 	/* read the first word from this packet */
1264 	outw( PTR_AUTOINC | PTR_READ, ioaddr + POINTER );
1265 
1266 	tx_status = inw( ioaddr + DATA_1 );
1267 	PRINTK3((CARDNAME": TX DONE STATUS: %4x\n", tx_status));
1268 
1269 	dev->stats.tx_errors++;
1270 	if ( tx_status & TS_LOSTCAR ) dev->stats.tx_carrier_errors++;
1271 	if ( tx_status & TS_LATCOL  ) {
1272 		netdev_dbg(dev, CARDNAME": Late collision occurred on last xmit.\n");
1273 		dev->stats.tx_window_errors++;
1274 	}
1275 #if 0
1276 		if ( tx_status & TS_16COL ) { ... }
1277 #endif
1278 
1279 	if ( tx_status & TS_SUCCESS ) {
1280 		netdev_info(dev, CARDNAME": Successful packet caused interrupt\n");
1281 	}
1282 	/* re-enable transmit */
1283 	SMC_SELECT_BANK( 0 );
1284 	outw( inw( ioaddr + TCR ) | TCR_ENABLE, ioaddr + TCR );
1285 
1286 	/* kill the packet */
1287 	SMC_SELECT_BANK( 2 );
1288 	outw( MC_FREEPKT, ioaddr + MMU_CMD );
1289 
1290 	/* one less packet waiting for me */
1291 	lp->packets_waiting--;
1292 
1293 	outb( saved_packet, ioaddr + PNR_ARR );
1294 }
1295 
1296 /*--------------------------------------------------------------------
1297  .
1298  . This is the main routine of the driver, to handle the device when
1299  . it needs some attention.
1300  .
1301  . So:
1302  .   first, save state of the chipset
1303  .   branch off into routines to handle each case, and acknowledge
1304  .	    each to the interrupt register
1305  .   and finally restore state.
1306  .
1307  ---------------------------------------------------------------------*/
1308 
1309 static irqreturn_t smc_interrupt(int irq, void * dev_id)
1310 {
1311 	struct net_device *dev 	= dev_id;
1312 	int ioaddr 		= dev->base_addr;
1313 	struct smc_local *lp = netdev_priv(dev);
1314 
1315 	byte	status;
1316 	word	card_stats;
1317 	byte	mask;
1318 	int	timeout;
1319 	/* state registers */
1320 	word	saved_bank;
1321 	word	saved_pointer;
1322 	int handled = 0;
1323 
1324 
1325 	PRINTK3((CARDNAME": SMC interrupt started\n"));
1326 
1327 	saved_bank = inw( ioaddr + BANK_SELECT );
1328 
1329 	SMC_SELECT_BANK(2);
1330 	saved_pointer = inw( ioaddr + POINTER );
1331 
1332 	mask = inb( ioaddr + INT_MASK );
1333 	/* clear all interrupts */
1334 	outb( 0, ioaddr + INT_MASK );
1335 
1336 
1337 	/* set a timeout value, so I don't stay here forever */
1338 	timeout = 4;
1339 
1340 	PRINTK2((KERN_WARNING CARDNAME ": MASK IS %x\n", mask));
1341 	do {
1342 		/* read the status flag, and mask it */
1343 		status = inb( ioaddr + INTERRUPT ) & mask;
1344 		if (!status )
1345 			break;
1346 
1347 		handled = 1;
1348 
1349 		PRINTK3((KERN_WARNING CARDNAME
1350 			": Handling interrupt status %x\n", status));
1351 
1352 		if (status & IM_RCV_INT) {
1353 			/* Got a packet(s). */
1354 			PRINTK2((KERN_WARNING CARDNAME
1355 				": Receive Interrupt\n"));
1356 			smc_rcv(dev);
1357 		} else if (status & IM_TX_INT ) {
1358 			PRINTK2((KERN_WARNING CARDNAME
1359 				": TX ERROR handled\n"));
1360 			smc_tx(dev);
1361 			outb(IM_TX_INT, ioaddr + INTERRUPT );
1362 		} else if (status & IM_TX_EMPTY_INT ) {
1363 			/* update stats */
1364 			SMC_SELECT_BANK( 0 );
1365 			card_stats = inw( ioaddr + COUNTER );
1366 			/* single collisions */
1367 			dev->stats.collisions += card_stats & 0xF;
1368 			card_stats >>= 4;
1369 			/* multiple collisions */
1370 			dev->stats.collisions += card_stats & 0xF;
1371 
1372 			/* these are for when linux supports these statistics */
1373 
1374 			SMC_SELECT_BANK( 2 );
1375 			PRINTK2((KERN_WARNING CARDNAME
1376 				": TX_BUFFER_EMPTY handled\n"));
1377 			outb( IM_TX_EMPTY_INT, ioaddr + INTERRUPT );
1378 			mask &= ~IM_TX_EMPTY_INT;
1379 			dev->stats.tx_packets += lp->packets_waiting;
1380 			lp->packets_waiting = 0;
1381 
1382 		} else if (status & IM_ALLOC_INT ) {
1383 			PRINTK2((KERN_DEBUG CARDNAME
1384 				": Allocation interrupt\n"));
1385 			/* clear this interrupt so it doesn't happen again */
1386 			mask &= ~IM_ALLOC_INT;
1387 
1388 			smc_hardware_send_packet( dev );
1389 
1390 			/* enable xmit interrupts based on this */
1391 			mask |= ( IM_TX_EMPTY_INT | IM_TX_INT );
1392 
1393 			/* and let the card send more packets to me */
1394 			netif_wake_queue(dev);
1395 
1396 			PRINTK2((CARDNAME": Handoff done successfully.\n"));
1397 		} else if (status & IM_RX_OVRN_INT ) {
1398 			dev->stats.rx_errors++;
1399 			dev->stats.rx_fifo_errors++;
1400 			outb( IM_RX_OVRN_INT, ioaddr + INTERRUPT );
1401 		} else if (status & IM_EPH_INT ) {
1402 			PRINTK((CARDNAME ": UNSUPPORTED: EPH INTERRUPT\n"));
1403 		} else if (status & IM_ERCV_INT ) {
1404 			PRINTK((CARDNAME ": UNSUPPORTED: ERCV INTERRUPT\n"));
1405 			outb( IM_ERCV_INT, ioaddr + INTERRUPT );
1406 		}
1407 	} while ( timeout -- );
1408 
1409 
1410 	/* restore state register */
1411 	SMC_SELECT_BANK( 2 );
1412 	outb( mask, ioaddr + INT_MASK );
1413 
1414 	PRINTK3((KERN_WARNING CARDNAME ": MASK is now %x\n", mask));
1415 	outw( saved_pointer, ioaddr + POINTER );
1416 
1417 	SMC_SELECT_BANK( saved_bank );
1418 
1419 	PRINTK3((CARDNAME ": Interrupt done\n"));
1420 	return IRQ_RETVAL(handled);
1421 }
1422 
1423 
1424 /*----------------------------------------------------
1425  . smc_close
1426  .
1427  . this makes the board clean up everything that it can
1428  . and not talk to the outside world.   Caused by
1429  . an 'ifconfig ethX down'
1430  .
1431  -----------------------------------------------------*/
1432 static int smc_close(struct net_device *dev)
1433 {
1434 	netif_stop_queue(dev);
1435 	/* clear everything */
1436 	smc_shutdown( dev->base_addr );
1437 
1438 	/* Update the statistics here. */
1439 	return 0;
1440 }
1441 
1442 /*-----------------------------------------------------------
1443  . smc_set_multicast_list
1444  .
1445  . This routine will, depending on the values passed to it,
1446  . either make it accept multicast packets, go into
1447  . promiscuous mode ( for TCPDUMP and cousins ) or accept
1448  . a select set of multicast packets
1449 */
1450 static void smc_set_multicast_list(struct net_device *dev)
1451 {
1452 	short ioaddr = dev->base_addr;
1453 
1454 	SMC_SELECT_BANK(0);
1455 	if ( dev->flags & IFF_PROMISC )
1456 		outw( inw(ioaddr + RCR ) | RCR_PROMISC, ioaddr + RCR );
1457 
1458 /* BUG?  I never disable promiscuous mode if multicasting was turned on.
1459    Now, I turn off promiscuous mode, but I don't do anything to multicasting
1460    when promiscuous mode is turned on.
1461 */
1462 
1463 	/* Here, I am setting this to accept all multicast packets.
1464 	   I don't need to zero the multicast table, because the flag is
1465 	   checked before the table is
1466 	*/
1467 	else if (dev->flags & IFF_ALLMULTI)
1468 		outw( inw(ioaddr + RCR ) | RCR_ALMUL, ioaddr + RCR );
1469 
1470 	/* We just get all multicast packets even if we only want them
1471 	 . from one source.  This will be changed at some future
1472 	 . point. */
1473 	else if (!netdev_mc_empty(dev)) {
1474 		/* support hardware multicasting */
1475 
1476 		/* be sure I get rid of flags I might have set */
1477 		outw( inw( ioaddr + RCR ) & ~(RCR_PROMISC | RCR_ALMUL),
1478 			ioaddr + RCR );
1479 		/* NOTE: this has to set the bank, so make sure it is the
1480 		   last thing called.  The bank is set to zero at the top */
1481 		smc_setmulticast(ioaddr, dev);
1482 	}
1483 	else  {
1484 		outw( inw( ioaddr + RCR ) & ~(RCR_PROMISC | RCR_ALMUL),
1485 			ioaddr + RCR );
1486 
1487 		/*
1488 		  since I'm disabling all multicast entirely, I need to
1489 		  clear the multicast list
1490 		*/
1491 		SMC_SELECT_BANK( 3 );
1492 		outw( 0, ioaddr + MULTICAST1 );
1493 		outw( 0, ioaddr + MULTICAST2 );
1494 		outw( 0, ioaddr + MULTICAST3 );
1495 		outw( 0, ioaddr + MULTICAST4 );
1496 	}
1497 }
1498 
1499 #ifdef MODULE
1500 
1501 static struct net_device *devSMC9194;
1502 MODULE_LICENSE("GPL");
1503 
1504 module_param_hw(io, int, ioport, 0);
1505 module_param_hw(irq, int, irq, 0);
1506 module_param(ifport, int, 0);
1507 MODULE_PARM_DESC(io, "SMC 99194 I/O base address");
1508 MODULE_PARM_DESC(irq, "SMC 99194 IRQ number");
1509 MODULE_PARM_DESC(ifport, "SMC 99194 interface port (0-default, 1-TP, 2-AUI)");
1510 
1511 int __init init_module(void)
1512 {
1513 	if (io == 0)
1514 		printk(KERN_WARNING
1515 		CARDNAME": You shouldn't use auto-probing with insmod!\n" );
1516 
1517 	/* copy the parameters from insmod into the device structure */
1518 	devSMC9194 = smc_init(-1);
1519 	return PTR_ERR_OR_ZERO(devSMC9194);
1520 }
1521 
1522 void __exit cleanup_module(void)
1523 {
1524 	unregister_netdev(devSMC9194);
1525 	free_irq(devSMC9194->irq, devSMC9194);
1526 	release_region(devSMC9194->base_addr, SMC_IO_EXTENT);
1527 	free_netdev(devSMC9194);
1528 }
1529 
1530 #endif /* MODULE */
1531