1 /*------------------------------------------------------------------------
3 . This is a driver for SMC's 9000 series of Ethernet cards.
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.
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 )
15 . io = for the base address
17 . ifport = 0 for autodetect, 1 for TP, 2 for AUI ( or 10base2 )
20 . Erik Stahlman ( erik@vt.edu )
22 . Arnaldo Carvalho de Melo <acme@conectiva.com.br>
24 . Hardware multicast code from Peter Cammaert ( pc@denkart.be )
28 . o skeleton.c by Donald Becker ( becker@scyld.com )
29 . o ( a LOT of advice from Becker as well )
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
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 ----------------------------------------------------------------------------*/
57 static const char version[] =
58 "smc9194.c:v0.14 12/15/00 by Erik Stahlman (erik@vt.edu)\n";
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>
67 #include <linux/slab.h>
68 #include <linux/string.h>
69 #include <linux/init.h>
70 #include <linux/crc32.h>
71 #include <linux/errno.h>
72 #include <linux/netdevice.h>
73 #include <linux/etherdevice.h>
74 #include <linux/skbuff.h>
75 #include <linux/bitops.h>
81 #define DRV_NAME "smc9194"
83 /*------------------------------------------------------------------------
85 . Configuration options, for the experienced user to change.
87 -------------------------------------------------------------------------*/
90 . Do you want to use 32 bit xfers? This should work on all chips, as
91 . the chipset is designed to accommodate them.
99 #if defined(__H8300H__) || defined(__H8300S__)
103 #define insl(a,b,l) io_insl_noswap(a,b,l)
104 #define outsl(a,b,l) io_outsl_noswap(a,b,l)
108 .the SMC9194 can be at any of the following port addresses. To change,
109 .for a slightly different card, you can add it to the array. Keep in
110 .mind that the array must end in zero.
118 #if defined(CONFIG_H8S_EDOSK2674)
119 static struct devlist smc_devlist[] __initdata = {
120 {.port = 0xf80000, .irq = 16},
121 {.port = 0, .irq = 0 },
124 static struct devlist smc_devlist[] __initdata = {
125 {.port = 0x200, .irq = 0},
126 {.port = 0x220, .irq = 0},
127 {.port = 0x240, .irq = 0},
128 {.port = 0x260, .irq = 0},
129 {.port = 0x280, .irq = 0},
130 {.port = 0x2A0, .irq = 0},
131 {.port = 0x2C0, .irq = 0},
132 {.port = 0x2E0, .irq = 0},
133 {.port = 0x300, .irq = 0},
134 {.port = 0x320, .irq = 0},
135 {.port = 0x340, .irq = 0},
136 {.port = 0x360, .irq = 0},
137 {.port = 0x380, .irq = 0},
138 {.port = 0x3A0, .irq = 0},
139 {.port = 0x3C0, .irq = 0},
140 {.port = 0x3E0, .irq = 0},
141 {.port = 0, .irq = 0},
145 . Wait time for memory to be free. This probably shouldn't be
146 . tuned that much, as waiting for this means nothing else happens
149 #define MEMORY_WAIT_TIME 16
154 . 0 for normal operation
155 . 1 for slightly more details
156 . >2 for various levels of increasingly useless information
157 . 2 for interrupt tracking, status flags
158 . 3 for packet dumps, etc.
163 #define PRINTK3(x) printk x
169 #define PRINTK2(x) printk x
175 #define PRINTK(x) printk x
181 /*------------------------------------------------------------------------
183 . The internal workings of the driver. If you are changing anything
184 . here with the SMC stuff, you should have the datasheet and known
185 . what you are doing.
187 -------------------------------------------------------------------------*/
188 #define CARDNAME "SMC9194"
191 /* store this information for the driver.. */
194 these are things that the kernel wants me to keep, so users
195 can find out semi-useless statistics of how well the card is
198 struct net_device_stats stats;
201 If I have to wait until memory is available to send
202 a packet, I will store the skbuff here, until I get the
203 desired memory. Then, I'll send it out and free it.
205 struct sk_buff * saved_skb;
208 . This keeps track of how many packets that I have
209 . sent out. When an TX_EMPTY interrupt comes, I know
210 . that all of these have been sent.
216 /*-----------------------------------------------------------------
218 . The driver can be entered at any of the following entry points.
220 .------------------------------------------------------------------ */
223 . This is called by register_netdev(). It is responsible for
224 . checking the portlist for the SMC9000 series chipset. If it finds
225 . one, then it will initialize the device, find the hardware information,
226 . and sets up the appropriate device parameters.
227 . NOTE: Interrupts are *OFF* when this procedure is called.
229 . NB:This shouldn't be static since it is referred to externally.
231 struct net_device *smc_init(int unit);
234 . The kernel calls this function when someone wants to use the device,
235 . typically 'ifconfig ethX up'.
237 static int smc_open(struct net_device *dev);
240 . Our watchdog timed out. Called by the networking layer
242 static void smc_timeout(struct net_device *dev);
245 . This is called by the kernel in response to 'ifconfig ethX down'. It
246 . is responsible for cleaning up everything that the open routine
247 . does, and maybe putting the card into a powerdown state.
249 static int smc_close(struct net_device *dev);
252 . This routine allows the proc file system to query the driver's
255 static struct net_device_stats * smc_query_statistics( struct net_device *dev);
258 . Finally, a call to set promiscuous mode ( for TCPDUMP and related
259 . programs ) and multicast modes.
261 static void smc_set_multicast_list(struct net_device *dev);
264 /*---------------------------------------------------------------
266 . Interrupt level calls..
268 ----------------------------------------------------------------*/
271 . Handles the actual interrupt
273 static irqreturn_t smc_interrupt(int irq, void *, struct pt_regs *regs);
275 . This is a separate procedure to handle the receipt of a packet, to
276 . leave the interrupt code looking slightly cleaner
278 static inline void smc_rcv( struct net_device *dev );
280 . This handles a TX interrupt, which is only called when an error
281 . relating to a packet is sent.
283 static inline void smc_tx( struct net_device * dev );
286 ------------------------------------------------------------
290 ------------------------------------------------------------
294 . Test if a given location contains a chip, trying to cause as
295 . little damage as possible if it's not a SMC chip.
297 static int smc_probe(struct net_device *dev, int ioaddr);
300 . A rather simple routine to print out a packet for debugging purposes.
303 static void print_packet( byte *, int );
306 #define tx_done(dev) 1
308 /* this is called to actually send the packet to the chip */
309 static void smc_hardware_send_packet( struct net_device * dev );
311 /* Since I am not sure if I will have enough room in the chip's ram
312 . to store the packet, I call this routine, which either sends it
313 . now, or generates an interrupt when the card is ready for the
315 static int smc_wait_to_send_packet( struct sk_buff * skb, struct net_device *dev );
317 /* this does a soft reset on the device */
318 static void smc_reset( int ioaddr );
320 /* Enable Interrupts, Receive, and Transmit */
321 static void smc_enable( int ioaddr );
323 /* this puts the device in an inactive state */
324 static void smc_shutdown( int ioaddr );
326 /* This routine will find the IRQ of the driver if one is not
327 . specified in the input to the device. */
328 static int smc_findirq( int ioaddr );
331 . Function: smc_reset( int ioaddr )
333 . This sets the SMC91xx chip to its normal state, hopefully from whatever
334 . mess that any other DOS driver has put it in.
336 . Maybe I should reset more registers to defaults in here? SOFTRESET should
340 . 1. send a SOFT RESET
341 . 2. wait for it to finish
342 . 3. enable autorelease mode
343 . 4. reset the memory management unit
344 . 5. clear all interrupts
347 static void smc_reset( int ioaddr )
349 /* This resets the registers mostly to defaults, but doesn't
350 affect EEPROM. That seems unnecessary */
351 SMC_SELECT_BANK( 0 );
352 outw( RCR_SOFTRESET, ioaddr + RCR );
354 /* this should pause enough for the chip to be happy */
357 /* Set the transmit and receive configuration registers to
359 outw( RCR_CLEAR, ioaddr + RCR );
360 outw( TCR_CLEAR, ioaddr + TCR );
362 /* set the control register to automatically
363 release successfully transmitted packets, to make the best
364 use out of our limited memory */
365 SMC_SELECT_BANK( 1 );
366 outw( inw( ioaddr + CONTROL ) | CTL_AUTO_RELEASE , ioaddr + CONTROL );
369 SMC_SELECT_BANK( 2 );
370 outw( MC_RESET, ioaddr + MMU_CMD );
372 /* Note: It doesn't seem that waiting for the MMU busy is needed here,
373 but this is a place where future chipsets _COULD_ break. Be wary
374 of issuing another MMU command right after this */
376 outb( 0, ioaddr + INT_MASK );
380 . Function: smc_enable
381 . Purpose: let the chip talk to the outside work
383 . 1. Enable the transmitter
384 . 2. Enable the receiver
385 . 3. Enable interrupts
387 static void smc_enable( int ioaddr )
389 SMC_SELECT_BANK( 0 );
390 /* see the header file for options in TCR/RCR NORMAL*/
391 outw( TCR_NORMAL, ioaddr + TCR );
392 outw( RCR_NORMAL, ioaddr + RCR );
394 /* now, enable interrupts */
395 SMC_SELECT_BANK( 2 );
396 outb( SMC_INTERRUPT_MASK, ioaddr + INT_MASK );
400 . Function: smc_shutdown
401 . Purpose: closes down the SMC91xxx chip.
403 . 1. zero the interrupt mask
404 . 2. clear the enable receive flag
405 . 3. clear the enable xmit flags
408 . (1) maybe utilize power down mode.
409 . Why not yet? Because while the chip will go into power down mode,
410 . the manual says that it will wake up in response to any I/O requests
411 . in the register space. Empirical results do not show this working.
413 static void smc_shutdown( int ioaddr )
415 /* no more interrupts for me */
416 SMC_SELECT_BANK( 2 );
417 outb( 0, ioaddr + INT_MASK );
419 /* and tell the card to stay away from that nasty outside world */
420 SMC_SELECT_BANK( 0 );
421 outb( RCR_CLEAR, ioaddr + RCR );
422 outb( TCR_CLEAR, ioaddr + TCR );
424 /* finally, shut the chip down */
425 SMC_SELECT_BANK( 1 );
426 outw( inw( ioaddr + CONTROL ), CTL_POWERDOWN, ioaddr + CONTROL );
432 . Function: smc_setmulticast( int ioaddr, int count, dev_mc_list * adds )
434 . This sets the internal hardware table to filter out unwanted multicast
435 . packets before they take up memory.
437 . The SMC chip uses a hash table where the high 6 bits of the CRC of
438 . address are the offset into the table. If that bit is 1, then the
439 . multicast packet is accepted. Otherwise, it's dropped silently.
441 . To use the 6 bits as an offset into the table, the high 3 bits are the
442 . number of the 8 bit register, while the low 3 bits are the bit within
445 . This routine is based very heavily on the one provided by Peter Cammaert.
449 static void smc_setmulticast( int ioaddr, int count, struct dev_mc_list * addrs ) {
451 unsigned char multicast_table[ 8 ];
452 struct dev_mc_list * cur_addr;
453 /* table for flipping the order of 3 bits */
454 unsigned char invert3[] = { 0, 4, 2, 6, 1, 5, 3, 7 };
456 /* start with a table of all zeros: reject all */
457 memset( multicast_table, 0, sizeof( multicast_table ) );
460 for ( i = 0; i < count ; i ++, cur_addr = cur_addr->next ) {
463 /* do we have a pointer here? */
466 /* make sure this is a multicast address - shouldn't this
467 be a given if we have it here ? */
468 if ( !( *cur_addr->dmi_addr & 1 ) )
471 /* only use the low order bits */
472 position = ether_crc_le(6, cur_addr->dmi_addr) & 0x3f;
474 /* do some messy swapping to put the bit in the right spot */
475 multicast_table[invert3[position&7]] |=
476 (1<<invert3[(position>>3)&7]);
479 /* now, the table can be loaded into the chipset */
480 SMC_SELECT_BANK( 3 );
482 for ( i = 0; i < 8 ; i++ ) {
483 outb( multicast_table[i], ioaddr + MULTICAST1 + i );
488 . Function: smc_wait_to_send_packet( struct sk_buff * skb, struct net_device * )
490 . Attempt to allocate memory for a packet, if chip-memory is not
491 . available, then tell the card to generate an interrupt when it
496 . o if the saved_skb is not currently null, then drop this packet
497 . on the floor. This should never happen, because of TBUSY.
498 . o if the saved_skb is null, then replace it with the current packet,
499 . o See if I can sending it now.
500 . o (NO): Enable interrupts and let the interrupt handler deal with it.
501 . o (YES):Send it now.
503 static int smc_wait_to_send_packet( struct sk_buff * skb, struct net_device * dev )
505 struct smc_local *lp = netdev_priv(dev);
506 unsigned int ioaddr = dev->base_addr;
508 unsigned short numPages;
511 netif_stop_queue(dev);
512 /* Well, I want to send the packet.. but I don't know
513 if I can send it right now... */
515 if ( lp->saved_skb) {
516 /* THIS SHOULD NEVER HAPPEN. */
517 lp->stats.tx_aborted_errors++;
518 printk(CARDNAME": Bad Craziness - sent packet while busy.\n" );
525 if (length < ETH_ZLEN) {
526 skb = skb_padto(skb, ETH_ZLEN);
528 netif_wake_queue(dev);
535 ** The MMU wants the number of pages to be the number of 256 bytes
536 ** 'pages', minus 1 ( since a packet can't ever have 0 pages :) )
538 ** Pkt size for allocating is data length +6 (for additional status words,
539 ** length and ctl!) If odd size last byte is included in this header.
541 numPages = ((length & 0xfffe) + 6) / 256;
544 printk(CARDNAME": Far too big packet error. \n");
545 /* freeing the packet is a good thing here... but should
546 . any packets of this size get down here? */
548 lp->saved_skb = NULL;
549 /* this IS an error, but, i don't want the skb saved */
550 netif_wake_queue(dev);
553 /* either way, a packet is waiting now */
554 lp->packets_waiting++;
556 /* now, try to allocate the memory */
557 SMC_SELECT_BANK( 2 );
558 outw( MC_ALLOC | numPages, ioaddr + MMU_CMD );
562 . wait a short amount of time.. if I can send a packet now, I send
563 . it now. Otherwise, I enable an interrupt and wait for one to be
566 . I could have handled this a slightly different way, by checking to
567 . see if any memory was available in the FREE MEMORY register. However,
568 . either way, I need to generate an allocation, and the allocation works
569 . no matter what, so I saw no point in checking free memory.
571 time_out = MEMORY_WAIT_TIME;
575 status = inb( ioaddr + INTERRUPT );
576 if ( status & IM_ALLOC_INT ) {
577 /* acknowledge the interrupt */
578 outb( IM_ALLOC_INT, ioaddr + INTERRUPT );
581 } while ( -- time_out );
584 /* oh well, wait until the chip finds memory later */
585 SMC_ENABLE_INT( IM_ALLOC_INT );
586 PRINTK2((CARDNAME": memory allocation deferred. \n"));
587 /* it's deferred, but I'll handle it later */
590 /* or YES! I can send the packet now.. */
591 smc_hardware_send_packet(dev);
592 netif_wake_queue(dev);
597 . Function: smc_hardware_send_packet(struct net_device * )
599 . This sends the actual packet to the SMC9xxx chip.
602 . First, see if a saved_skb is available.
603 . ( this should NOT be called if there is no 'saved_skb'
604 . Now, find the packet number that the chip allocated
605 . Point the data pointers at it in memory
606 . Set the length word in the chip's memory
607 . Dump the packet to chip memory
608 . Check if a last byte is needed ( odd length packet )
609 . if so, set the control flag right
610 . Tell the card to send it
611 . Enable the transmit interrupt, so I know if it failed
612 . Free the kernel data if I actually sent it.
614 static void smc_hardware_send_packet( struct net_device * dev )
616 struct smc_local *lp = netdev_priv(dev);
618 struct sk_buff * skb = lp->saved_skb;
623 ioaddr = dev->base_addr;
626 PRINTK((CARDNAME": In XMIT with no packet to send \n"));
629 length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
632 /* If I get here, I _know_ there is a packet slot waiting for me */
633 packet_no = inb( ioaddr + PNR_ARR + 1 );
634 if ( packet_no & 0x80 ) {
635 /* or isn't there? BAD CHIP! */
636 printk(KERN_DEBUG CARDNAME": Memory allocation failed. \n");
637 dev_kfree_skb_any(skb);
638 lp->saved_skb = NULL;
639 netif_wake_queue(dev);
643 /* we have a packet address, so tell the card to use it */
644 outb( packet_no, ioaddr + PNR_ARR );
646 /* point to the beginning of the packet */
647 outw( PTR_AUTOINC , ioaddr + POINTER );
649 PRINTK3((CARDNAME": Trying to xmit packet of length %x\n", length ));
651 print_packet( buf, length );
654 /* send the packet length ( +6 for status, length and ctl byte )
655 and the status word ( set to zeros ) */
657 outl( (length +6 ) << 16 , ioaddr + DATA_1 );
659 outw( 0, ioaddr + DATA_1 );
660 /* send the packet length ( +6 for status words, length, and ctl*/
661 outb( (length+6) & 0xFF,ioaddr + DATA_1 );
662 outb( (length+6) >> 8 , ioaddr + DATA_1 );
665 /* send the actual data
666 . I _think_ it's faster to send the longs first, and then
667 . mop up by sending the last word. It depends heavily
668 . on alignment, at least on the 486. Maybe it would be
669 . a good idea to check which is optimal? But that could take
670 . almost as much time as is saved?
673 if ( length & 0x2 ) {
674 outsl(ioaddr + DATA_1, buf, length >> 2 );
675 #if !defined(__H8300H__) && !defined(__H8300S__)
676 outw( *((word *)(buf + (length & 0xFFFFFFFC))),ioaddr +DATA_1);
678 ctrl_outw( *((word *)(buf + (length & 0xFFFFFFFC))),ioaddr +DATA_1);
682 outsl(ioaddr + DATA_1, buf, length >> 2 );
684 outsw(ioaddr + DATA_1 , buf, (length ) >> 1);
686 /* Send the last byte, if there is one. */
688 if ( (length & 1) == 0 ) {
689 outw( 0, ioaddr + DATA_1 );
691 outb( buf[length -1 ], ioaddr + DATA_1 );
692 outb( 0x20, ioaddr + DATA_1);
695 /* enable the interrupts */
696 SMC_ENABLE_INT( (IM_TX_INT | IM_TX_EMPTY_INT) );
698 /* and let the chipset deal with it */
699 outw( MC_ENQUEUE , ioaddr + MMU_CMD );
701 PRINTK2((CARDNAME": Sent packet of length %d \n",length));
703 lp->saved_skb = NULL;
704 dev_kfree_skb_any (skb);
706 dev->trans_start = jiffies;
708 /* we can send another packet */
709 netif_wake_queue(dev);
714 /*-------------------------------------------------------------------------
718 | dev->base_addr == 0, try to find all possible locations
719 | dev->base_addr == 1, return failure code
720 | dev->base_addr == 2, always allocate space, and return success
721 | dev->base_addr == <anything else> this is the address to check
724 | pointer to net_device or ERR_PTR(error)
726 ---------------------------------------------------------------------------
732 struct net_device * __init smc_init(int unit)
734 struct net_device *dev = alloc_etherdev(sizeof(struct smc_local));
735 static struct devlist *smcdev = smc_devlist;
739 smcdev = smc_devlist;
742 return ERR_PTR(-ENODEV);
745 sprintf(dev->name, "eth%d", unit);
746 netdev_boot_setup_check(dev);
751 SET_MODULE_OWNER(dev);
753 if (io > 0x1ff) { /* Check a single specified location. */
754 err = smc_probe(dev, io);
755 } else if (io != 0) { /* Don't probe at all. */
758 for (;smcdev->port; smcdev++) {
759 if (smc_probe(dev, smcdev->port) == 0)
767 err = register_netdev(dev);
772 free_irq(dev->irq, dev);
773 release_region(dev->base_addr, SMC_IO_EXTENT);
779 /*----------------------------------------------------------------------
782 . This routine has a simple purpose -- make the SMC chip generate an
783 . interrupt, so an auto-detect routine can detect it, and find the IRQ,
784 ------------------------------------------------------------------------
786 int __init smc_findirq( int ioaddr )
790 unsigned long cookie;
793 cookie = probe_irq_on();
796 * What I try to do here is trigger an ALLOC_INT. This is done
797 * by allocating a small chunk of memory, which will give an interrupt
803 /* enable ALLOCation interrupts ONLY */
804 outb( IM_ALLOC_INT, ioaddr + INT_MASK );
807 . Allocate 512 bytes of memory. Note that the chip was just
808 . reset so all the memory is available
810 outw( MC_ALLOC | 1, ioaddr + MMU_CMD );
813 . Wait until positive that the interrupt has been generated
818 int_status = inb( ioaddr + INTERRUPT );
820 if ( int_status & IM_ALLOC_INT )
821 break; /* got the interrupt */
824 /* there is really nothing that I can do here if timeout fails,
825 as probe_irq_off will return a 0 anyway, which is what I
826 want in this case. Plus, the clean up is needed in both
830 On a fast machine, the status might change before the interrupt
831 is given to the processor. This means that the interrupt was
832 never detected, and probe_irq_off fails to report anything.
833 This should fix probe_irq_* problems.
838 /* and disable all interrupts again */
839 outb( 0, ioaddr + INT_MASK );
841 /* and return what I found */
842 return probe_irq_off(cookie);
843 #else /* NO_AUTOPROBE */
844 struct devlist *smcdev;
845 for (smcdev = smc_devlist; smcdev->port; smcdev++) {
846 if (smcdev->port == ioaddr)
853 /*----------------------------------------------------------------------
854 . Function: smc_probe( int ioaddr )
857 . Tests to see if a given ioaddr points to an SMC9xxx chip.
858 . Returns a 0 on success
861 . (1) see if the high byte of BANK_SELECT is 0x33
862 . (2) compare the ioaddr with the base register's address
863 . (3) see if I recognize the chip ID in the appropriate register
865 .---------------------------------------------------------------------
868 /*---------------------------------------------------------------
869 . Here I do typical initialization tasks.
871 . o Initialize the structure if needed
872 . o print out my vanity message if not done so already
873 . o print out what type of hardware is detected
874 . o print out the ethernet address
876 . o set up my private data
877 . o configure the dev structure with my subroutines
878 . o actually GRAB the irq.
880 .-----------------------------------------------------------------
882 static int __init smc_probe(struct net_device *dev, int ioaddr)
884 int i, memory, retval;
885 static unsigned version_printed;
888 const char *version_string;
889 const char *if_string;
892 word revision_register;
893 word base_address_register;
894 word configuration_register;
895 word memory_info_register;
896 word memory_cfg_register;
898 /* Grab the region so that no one else tries to probe our ioports. */
899 if (!request_region(ioaddr, SMC_IO_EXTENT, DRV_NAME))
903 dev->if_port = ifport;
905 /* First, see if the high byte is 0x33 */
906 bank = inw( ioaddr + BANK_SELECT );
907 if ( (bank & 0xFF00) != 0x3300 ) {
911 /* The above MIGHT indicate a device, but I need to write to further
913 outw( 0x0, ioaddr + BANK_SELECT );
914 bank = inw( ioaddr + BANK_SELECT );
915 if ( (bank & 0xFF00 ) != 0x3300 ) {
919 #if !defined(CONFIG_H8S_EDOSK2674)
920 /* well, we've already written once, so hopefully another time won't
921 hurt. This time, I need to switch the bank register to bank 1,
922 so I can access the base address register */
924 base_address_register = inw( ioaddr + BASE );
925 if ( ioaddr != ( base_address_register >> 3 & 0x3E0 ) ) {
926 printk(CARDNAME ": IOADDR %x doesn't match configuration (%x)."
927 "Probably not a SMC chip\n",
928 ioaddr, base_address_register >> 3 & 0x3E0 );
929 /* well, the base address register didn't match. Must not have
930 been a SMC chip after all. */
935 (void)base_address_register; /* Warning suppression */
939 /* check if the revision register is something that I recognize.
940 These might need to be added to later, as future revisions
943 revision_register = inw( ioaddr + REVISION );
944 if ( !chip_ids[ ( revision_register >> 4 ) & 0xF ] ) {
945 /* I don't recognize this chip, so... */
946 printk(CARDNAME ": IO %x: Unrecognized revision register:"
947 " %x, Contact author. \n", ioaddr, revision_register );
953 /* at this point I'll assume that the chip is an SMC9xxx.
954 It might be prudent to check a listing of MAC addresses
955 against the hardware address, or do some other tests. */
957 if (version_printed++ == 0)
958 printk("%s", version);
960 /* fill in some of the fields */
961 dev->base_addr = ioaddr;
964 . Get the MAC address ( bank 1, regs 4 - 9 )
966 SMC_SELECT_BANK( 1 );
967 for ( i = 0; i < 6; i += 2 ) {
970 address = inw( ioaddr + ADDR0 + i );
971 dev->dev_addr[ i + 1] = address >> 8;
972 dev->dev_addr[ i ] = address & 0xFF;
975 /* get the memory information */
977 SMC_SELECT_BANK( 0 );
978 memory_info_register = inw( ioaddr + MIR );
979 memory_cfg_register = inw( ioaddr + MCR );
980 memory = ( memory_cfg_register >> 9 ) & 0x7; /* multiplier */
981 memory *= 256 * ( memory_info_register & 0xFF );
984 Now, I want to find out more about the chip. This is sort of
985 redundant, but it's cleaner to have it in both, rather than having
986 one VERY long probe procedure.
989 revision_register = inw( ioaddr + REVISION );
990 version_string = chip_ids[ ( revision_register >> 4 ) & 0xF ];
991 if ( !version_string ) {
992 /* I shouldn't get here because this call was done before.... */
997 /* is it using AUI or 10BaseT ? */
998 if ( dev->if_port == 0 ) {
1000 configuration_register = inw( ioaddr + CONFIG );
1001 if ( configuration_register & CFG_AUI_SELECT )
1006 if_string = interfaces[ dev->if_port - 1 ];
1008 /* now, reset the chip, and put it into a known state */
1009 smc_reset( ioaddr );
1012 . If dev->irq is 0, then the device has to be banged on to see
1015 . This banging doesn't always detect the IRQ, for unknown reasons.
1016 . a workaround is to reset the chip and try again.
1018 . Interestingly, the DOS packet driver *SETS* the IRQ on the card to
1019 . be what is requested on the command line. I don't do that, mostly
1020 . because the card that I have uses a non-standard method of accessing
1021 . the IRQs, and because this _should_ work in most configurations.
1023 . Specifying an IRQ is done with the assumption that the user knows
1024 . what (s)he is doing. No checking is done!!!!
1027 if ( dev->irq < 2 ) {
1031 while ( trials-- ) {
1032 dev->irq = smc_findirq( ioaddr );
1035 /* kick the card and try again */
1036 smc_reset( ioaddr );
1039 if (dev->irq == 0 ) {
1040 printk(CARDNAME": Couldn't autodetect your IRQ. Use irq=xx.\n");
1045 /* now, print out the card info, in a short format.. */
1047 printk("%s: %s(r:%d) at %#3x IRQ:%d INTF:%s MEM:%db ", dev->name,
1048 version_string, revision_register & 0xF, ioaddr, dev->irq,
1049 if_string, memory );
1051 . Print the Ethernet address
1054 for (i = 0; i < 5; i++)
1055 printk("%2.2x:", dev->dev_addr[i] );
1056 printk("%2.2x \n", dev->dev_addr[5] );
1058 /* set the private data to zero by default */
1059 memset(dev->priv, 0, sizeof(struct smc_local));
1062 retval = request_irq(dev->irq, &smc_interrupt, 0, DRV_NAME, dev);
1064 printk("%s: unable to get IRQ %d (irqval=%d).\n", DRV_NAME,
1069 dev->open = smc_open;
1070 dev->stop = smc_close;
1071 dev->hard_start_xmit = smc_wait_to_send_packet;
1072 dev->tx_timeout = smc_timeout;
1073 dev->watchdog_timeo = HZ/20;
1074 dev->get_stats = smc_query_statistics;
1075 dev->set_multicast_list = smc_set_multicast_list;
1080 release_region(ioaddr, SMC_IO_EXTENT);
1085 static void print_packet( byte * buf, int length )
1092 printk("Packet of length %d \n", length );
1093 lines = length / 16;
1094 remainder = length % 16;
1096 for ( i = 0; i < lines ; i ++ ) {
1099 for ( cur = 0; cur < 8; cur ++ ) {
1104 printk("%02x%02x ", a, b );
1108 for ( i = 0; i < remainder/2 ; i++ ) {
1113 printk("%02x%02x ", a, b );
1122 * Open and Initialize the board
1124 * Set up everything, reset the card, etc ..
1127 static int smc_open(struct net_device *dev)
1129 int ioaddr = dev->base_addr;
1131 int i; /* used to set hw ethernet address */
1133 /* clear out all the junk that was put here before... */
1134 memset(dev->priv, 0, sizeof(struct smc_local));
1136 /* reset the hardware */
1138 smc_reset( ioaddr );
1139 smc_enable( ioaddr );
1141 /* Select which interface to use */
1143 SMC_SELECT_BANK( 1 );
1144 if ( dev->if_port == 1 ) {
1145 outw( inw( ioaddr + CONFIG ) & ~CFG_AUI_SELECT,
1148 else if ( dev->if_port == 2 ) {
1149 outw( inw( ioaddr + CONFIG ) | CFG_AUI_SELECT,
1154 According to Becker, I have to set the hardware address
1155 at this point, because the (l)user can set it with an
1156 ioctl. Easily done...
1158 SMC_SELECT_BANK( 1 );
1159 for ( i = 0; i < 6; i += 2 ) {
1162 address = dev->dev_addr[ i + 1 ] << 8 ;
1163 address |= dev->dev_addr[ i ];
1164 outw( address, ioaddr + ADDR0 + i );
1167 netif_start_queue(dev);
1171 /*--------------------------------------------------------
1172 . Called by the kernel to send a packet out into the void
1173 . of the net. This routine is largely based on
1174 . skeleton.c, from Becker.
1175 .--------------------------------------------------------
1178 static void smc_timeout(struct net_device *dev)
1180 /* If we get here, some higher level has decided we are broken.
1181 There should really be a "kick me" function call instead. */
1182 printk(KERN_WARNING CARDNAME": transmit timed out, %s?\n",
1183 tx_done(dev) ? "IRQ conflict" :
1184 "network cable problem");
1185 /* "kick" the adaptor */
1186 smc_reset( dev->base_addr );
1187 smc_enable( dev->base_addr );
1188 dev->trans_start = jiffies;
1189 /* clear anything saved */
1190 ((struct smc_local *)dev->priv)->saved_skb = NULL;
1191 netif_wake_queue(dev);
1194 /*-------------------------------------------------------------
1196 . smc_rcv - receive a packet from the card
1198 . There is ( at least ) a packet waiting to be read from
1202 . o If an error, record it
1203 . o otherwise, read in the packet
1204 --------------------------------------------------------------
1206 static void smc_rcv(struct net_device *dev)
1208 struct smc_local *lp = netdev_priv(dev);
1209 int ioaddr = dev->base_addr;
1216 packet_number = inw( ioaddr + FIFO_PORTS );
1218 if ( packet_number & FP_RXEMPTY ) {
1219 /* we got called , but nothing was on the FIFO */
1220 PRINTK((CARDNAME ": WARNING: smc_rcv with nothing on FIFO. \n"));
1221 /* don't need to restore anything */
1225 /* start reading from the start of the packet */
1226 outw( PTR_READ | PTR_RCV | PTR_AUTOINC, ioaddr + POINTER );
1228 /* First two words are status and packet_length */
1229 status = inw( ioaddr + DATA_1 );
1230 packet_length = inw( ioaddr + DATA_1 );
1232 packet_length &= 0x07ff; /* mask off top bits */
1234 PRINTK2(("RCV: STATUS %4x LENGTH %4x\n", status, packet_length ));
1236 . the packet length contains 3 extra words :
1237 . status, length, and an extra word with an odd byte .
1241 if ( !(status & RS_ERRORS ) ){
1242 /* do stuff to make a new packet */
1243 struct sk_buff * skb;
1246 /* read one extra byte */
1247 if ( status & RS_ODDFRAME )
1250 /* set multicast stats */
1251 if ( status & RS_MULTICAST )
1252 lp->stats.multicast++;
1254 skb = dev_alloc_skb( packet_length + 5);
1256 if ( skb == NULL ) {
1257 printk(KERN_NOTICE CARDNAME ": Low memory, packet dropped.\n");
1258 lp->stats.rx_dropped++;
1263 ! This should work without alignment, but it could be
1267 skb_reserve( skb, 2 ); /* 16 bit alignment */
1270 data = skb_put( skb, packet_length);
1273 /* QUESTION: Like in the TX routine, do I want
1274 to send the DWORDs or the bytes first, or some
1275 mixture. A mixture might improve already slow PIO
1277 PRINTK3((" Reading %d dwords (and %d bytes) \n",
1278 packet_length >> 2, packet_length & 3 ));
1279 insl(ioaddr + DATA_1 , data, packet_length >> 2 );
1280 /* read the left over bytes */
1281 insb( ioaddr + DATA_1, data + (packet_length & 0xFFFFFC),
1282 packet_length & 0x3 );
1284 PRINTK3((" Reading %d words and %d byte(s) \n",
1285 (packet_length >> 1 ), packet_length & 1 ));
1286 insw(ioaddr + DATA_1 , data, packet_length >> 1);
1287 if ( packet_length & 1 ) {
1288 data += packet_length & ~1;
1289 *(data++) = inb( ioaddr + DATA_1 );
1293 print_packet( data, packet_length );
1296 skb->protocol = eth_type_trans(skb, dev );
1298 dev->last_rx = jiffies;
1299 lp->stats.rx_packets++;
1300 lp->stats.rx_bytes += packet_length;
1303 lp->stats.rx_errors++;
1305 if ( status & RS_ALGNERR ) lp->stats.rx_frame_errors++;
1306 if ( status & (RS_TOOSHORT | RS_TOOLONG ) )
1307 lp->stats.rx_length_errors++;
1308 if ( status & RS_BADCRC) lp->stats.rx_crc_errors++;
1312 /* error or good, tell the card to get rid of this packet */
1313 outw( MC_RELEASE, ioaddr + MMU_CMD );
1317 /*************************************************************************
1320 . Purpose: Handle a transmit error message. This will only be called
1321 . when an error, because of the AUTO_RELEASE mode.
1324 . Save pointer and packet no
1325 . Get the packet no from the top of the queue
1326 . check if it's valid ( if not, is this an error??? )
1327 . read the status word
1329 . ( resend? Not really, since we don't want old packets around )
1330 . Restore saved values
1331 ************************************************************************/
1332 static void smc_tx( struct net_device * dev )
1334 int ioaddr = dev->base_addr;
1335 struct smc_local *lp = netdev_priv(dev);
1343 saved_packet = inb( ioaddr + PNR_ARR );
1344 packet_no = inw( ioaddr + FIFO_PORTS );
1347 /* select this as the packet to read from */
1348 outb( packet_no, ioaddr + PNR_ARR );
1350 /* read the first word from this packet */
1351 outw( PTR_AUTOINC | PTR_READ, ioaddr + POINTER );
1353 tx_status = inw( ioaddr + DATA_1 );
1354 PRINTK3((CARDNAME": TX DONE STATUS: %4x \n", tx_status ));
1356 lp->stats.tx_errors++;
1357 if ( tx_status & TS_LOSTCAR ) lp->stats.tx_carrier_errors++;
1358 if ( tx_status & TS_LATCOL ) {
1359 printk(KERN_DEBUG CARDNAME
1360 ": Late collision occurred on last xmit.\n");
1361 lp->stats.tx_window_errors++;
1364 if ( tx_status & TS_16COL ) { ... }
1367 if ( tx_status & TS_SUCCESS ) {
1368 printk(CARDNAME": Successful packet caused interrupt \n");
1370 /* re-enable transmit */
1371 SMC_SELECT_BANK( 0 );
1372 outw( inw( ioaddr + TCR ) | TCR_ENABLE, ioaddr + TCR );
1374 /* kill the packet */
1375 SMC_SELECT_BANK( 2 );
1376 outw( MC_FREEPKT, ioaddr + MMU_CMD );
1378 /* one less packet waiting for me */
1379 lp->packets_waiting--;
1381 outb( saved_packet, ioaddr + PNR_ARR );
1385 /*--------------------------------------------------------------------
1387 . This is the main routine of the driver, to handle the device when
1388 . it needs some attention.
1391 . first, save state of the chipset
1392 . branch off into routines to handle each case, and acknowledge
1393 . each to the interrupt register
1394 . and finally restore state.
1396 ---------------------------------------------------------------------*/
1398 static irqreturn_t smc_interrupt(int irq, void * dev_id, struct pt_regs * regs)
1400 struct net_device *dev = dev_id;
1401 int ioaddr = dev->base_addr;
1402 struct smc_local *lp = netdev_priv(dev);
1408 /* state registers */
1414 PRINTK3((CARDNAME": SMC interrupt started \n"));
1416 saved_bank = inw( ioaddr + BANK_SELECT );
1419 saved_pointer = inw( ioaddr + POINTER );
1421 mask = inb( ioaddr + INT_MASK );
1422 /* clear all interrupts */
1423 outb( 0, ioaddr + INT_MASK );
1426 /* set a timeout value, so I don't stay here forever */
1429 PRINTK2((KERN_WARNING CARDNAME ": MASK IS %x \n", mask ));
1431 /* read the status flag, and mask it */
1432 status = inb( ioaddr + INTERRUPT ) & mask;
1438 PRINTK3((KERN_WARNING CARDNAME
1439 ": Handling interrupt status %x \n", status ));
1441 if (status & IM_RCV_INT) {
1442 /* Got a packet(s). */
1443 PRINTK2((KERN_WARNING CARDNAME
1444 ": Receive Interrupt\n"));
1446 } else if (status & IM_TX_INT ) {
1447 PRINTK2((KERN_WARNING CARDNAME
1448 ": TX ERROR handled\n"));
1450 outb(IM_TX_INT, ioaddr + INTERRUPT );
1451 } else if (status & IM_TX_EMPTY_INT ) {
1453 SMC_SELECT_BANK( 0 );
1454 card_stats = inw( ioaddr + COUNTER );
1455 /* single collisions */
1456 lp->stats.collisions += card_stats & 0xF;
1458 /* multiple collisions */
1459 lp->stats.collisions += card_stats & 0xF;
1461 /* these are for when linux supports these statistics */
1463 SMC_SELECT_BANK( 2 );
1464 PRINTK2((KERN_WARNING CARDNAME
1465 ": TX_BUFFER_EMPTY handled\n"));
1466 outb( IM_TX_EMPTY_INT, ioaddr + INTERRUPT );
1467 mask &= ~IM_TX_EMPTY_INT;
1468 lp->stats.tx_packets += lp->packets_waiting;
1469 lp->packets_waiting = 0;
1471 } else if (status & IM_ALLOC_INT ) {
1472 PRINTK2((KERN_DEBUG CARDNAME
1473 ": Allocation interrupt \n"));
1474 /* clear this interrupt so it doesn't happen again */
1475 mask &= ~IM_ALLOC_INT;
1477 smc_hardware_send_packet( dev );
1479 /* enable xmit interrupts based on this */
1480 mask |= ( IM_TX_EMPTY_INT | IM_TX_INT );
1482 /* and let the card send more packets to me */
1483 netif_wake_queue(dev);
1485 PRINTK2((CARDNAME": Handoff done successfully.\n"));
1486 } else if (status & IM_RX_OVRN_INT ) {
1487 lp->stats.rx_errors++;
1488 lp->stats.rx_fifo_errors++;
1489 outb( IM_RX_OVRN_INT, ioaddr + INTERRUPT );
1490 } else if (status & IM_EPH_INT ) {
1491 PRINTK((CARDNAME ": UNSUPPORTED: EPH INTERRUPT \n"));
1492 } else if (status & IM_ERCV_INT ) {
1493 PRINTK((CARDNAME ": UNSUPPORTED: ERCV INTERRUPT \n"));
1494 outb( IM_ERCV_INT, ioaddr + INTERRUPT );
1496 } while ( timeout -- );
1499 /* restore state register */
1500 SMC_SELECT_BANK( 2 );
1501 outb( mask, ioaddr + INT_MASK );
1503 PRINTK3(( KERN_WARNING CARDNAME ": MASK is now %x \n", mask ));
1504 outw( saved_pointer, ioaddr + POINTER );
1506 SMC_SELECT_BANK( saved_bank );
1508 PRINTK3((CARDNAME ": Interrupt done\n"));
1509 return IRQ_RETVAL(handled);
1513 /*----------------------------------------------------
1516 . this makes the board clean up everything that it can
1517 . and not talk to the outside world. Caused by
1518 . an 'ifconfig ethX down'
1520 -----------------------------------------------------*/
1521 static int smc_close(struct net_device *dev)
1523 netif_stop_queue(dev);
1524 /* clear everything */
1525 smc_shutdown( dev->base_addr );
1527 /* Update the statistics here. */
1531 /*------------------------------------------------------------
1532 . Get the current statistics.
1533 . This may be called with the card open or closed.
1534 .-------------------------------------------------------------*/
1535 static struct net_device_stats* smc_query_statistics(struct net_device *dev) {
1536 struct smc_local *lp = netdev_priv(dev);
1541 /*-----------------------------------------------------------
1542 . smc_set_multicast_list
1544 . This routine will, depending on the values passed to it,
1545 . either make it accept multicast packets, go into
1546 . promiscuous mode ( for TCPDUMP and cousins ) or accept
1547 . a select set of multicast packets
1549 static void smc_set_multicast_list(struct net_device *dev)
1551 short ioaddr = dev->base_addr;
1554 if ( dev->flags & IFF_PROMISC )
1555 outw( inw(ioaddr + RCR ) | RCR_PROMISC, ioaddr + RCR );
1557 /* BUG? I never disable promiscuous mode if multicasting was turned on.
1558 Now, I turn off promiscuous mode, but I don't do anything to multicasting
1559 when promiscuous mode is turned on.
1562 /* Here, I am setting this to accept all multicast packets.
1563 I don't need to zero the multicast table, because the flag is
1564 checked before the table is
1566 else if (dev->flags & IFF_ALLMULTI)
1567 outw( inw(ioaddr + RCR ) | RCR_ALMUL, ioaddr + RCR );
1569 /* We just get all multicast packets even if we only want them
1570 . from one source. This will be changed at some future
1572 else if (dev->mc_count ) {
1573 /* support hardware multicasting */
1575 /* be sure I get rid of flags I might have set */
1576 outw( inw( ioaddr + RCR ) & ~(RCR_PROMISC | RCR_ALMUL),
1578 /* NOTE: this has to set the bank, so make sure it is the
1579 last thing called. The bank is set to zero at the top */
1580 smc_setmulticast( ioaddr, dev->mc_count, dev->mc_list );
1583 outw( inw( ioaddr + RCR ) & ~(RCR_PROMISC | RCR_ALMUL),
1587 since I'm disabling all multicast entirely, I need to
1588 clear the multicast list
1590 SMC_SELECT_BANK( 3 );
1591 outw( 0, ioaddr + MULTICAST1 );
1592 outw( 0, ioaddr + MULTICAST2 );
1593 outw( 0, ioaddr + MULTICAST3 );
1594 outw( 0, ioaddr + MULTICAST4 );
1600 static struct net_device *devSMC9194;
1601 MODULE_LICENSE("GPL");
1603 module_param(io, int, 0);
1604 module_param(irq, int, 0);
1605 module_param(ifport, int, 0);
1606 MODULE_PARM_DESC(io, "SMC 99194 I/O base address");
1607 MODULE_PARM_DESC(irq, "SMC 99194 IRQ number");
1608 MODULE_PARM_DESC(ifport, "SMC 99194 interface port (0-default, 1-TP, 2-AUI)");
1610 int init_module(void)
1614 CARDNAME": You shouldn't use auto-probing with insmod!\n" );
1616 /* copy the parameters from insmod into the device structure */
1617 devSMC9194 = smc_init(-1);
1618 if (IS_ERR(devSMC9194))
1619 return PTR_ERR(devSMC9194);
1623 void cleanup_module(void)
1625 unregister_netdev(devSMC9194);
1626 free_irq(devSMC9194->irq, devSMC9194);
1627 release_region(devSMC9194->base_addr, SMC_IO_EXTENT);
1628 free_netdev(devSMC9194);