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, unsigned int txqueue); |
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, port: 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, port: ioaddr + RCR ); |
332 | outw( TCR_CLEAR, port: 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( port: ioaddr + CONTROL ) | CTL_AUTO_RELEASE , port: ioaddr + CONTROL ); |
339 | |
340 | /* Reset the MMU */ |
341 | SMC_SELECT_BANK( 2 ); |
342 | outw( MC_RESET, port: 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( value: 0, port: 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, port: ioaddr + TCR ); |
364 | outw( RCR_NORMAL, port: ioaddr + RCR ); |
365 | |
366 | /* now, enable interrupts */ |
367 | SMC_SELECT_BANK( 2 ); |
368 | outb( SMC_INTERRUPT_MASK, port: 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( value: 0, port: 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, port: ioaddr + RCR ); |
394 | outb( TCR_CLEAR, port: 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( value: multicast_table[i], port: 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, port: 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( port: ioaddr + INTERRUPT ); |
540 | if ( status & IM_ALLOC_INT ) { |
541 | /* acknowledge the interrupt */ |
542 | outb( IM_ALLOC_INT, port: 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( port: 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( value: packet_no, port: ioaddr + PNR_ARR ); |
609 | |
610 | /* point to the beginning of the packet */ |
611 | outw( PTR_AUTOINC , port: 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( value: (length +6 ) << 16 , port: 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(port: ioaddr + DATA_1, addr: buf, count: length >> 2 ); |
639 | outw( value: *((word *)(buf + (length & 0xFFFFFFFC))),port: ioaddr +DATA_1); |
640 | } |
641 | else |
642 | outsl(port: ioaddr + DATA_1, addr: buf, count: 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( value: 0, port: ioaddr + DATA_1 ); |
650 | } else { |
651 | outb( value: buf[length -1 ], port: ioaddr + DATA_1 ); |
652 | outb( value: 0x20, port: 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 , port: 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(error: -ENODEV); |
698 | |
699 | if (unit >= 0) { |
700 | sprintf(buf: dev->name, fmt: "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, ioaddr: 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, ioaddr: 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(error: 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, port: 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, port: 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( port: 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( value: 0, port: 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 | u8 addr[ETH_ALEN]; |
860 | |
861 | /* Grab the region so that no one else tries to probe our ioports. */ |
862 | if (!request_region(ioaddr, SMC_IO_EXTENT, DRV_NAME)) |
863 | return -EBUSY; |
864 | |
865 | dev->irq = irq; |
866 | dev->if_port = ifport; |
867 | |
868 | /* First, see if the high byte is 0x33 */ |
869 | bank = inw( port: ioaddr + BANK_SELECT ); |
870 | if ( (bank & 0xFF00) != 0x3300 ) { |
871 | retval = -ENODEV; |
872 | goto err_out; |
873 | } |
874 | /* The above MIGHT indicate a device, but I need to write to further |
875 | test this. */ |
876 | outw( value: 0x0, port: ioaddr + BANK_SELECT ); |
877 | bank = inw( port: ioaddr + BANK_SELECT ); |
878 | if ( (bank & 0xFF00 ) != 0x3300 ) { |
879 | retval = -ENODEV; |
880 | goto err_out; |
881 | } |
882 | /* well, we've already written once, so hopefully another time won't |
883 | hurt. This time, I need to switch the bank register to bank 1, |
884 | so I can access the base address register */ |
885 | SMC_SELECT_BANK(1); |
886 | base_address_register = inw( port: ioaddr + BASE ); |
887 | if ( ioaddr != ( base_address_register >> 3 & 0x3E0 ) ) { |
888 | printk(CARDNAME ": IOADDR %x doesn't match configuration (%x). " |
889 | "Probably not a SMC chip\n" , |
890 | ioaddr, base_address_register >> 3 & 0x3E0 ); |
891 | /* well, the base address register didn't match. Must not have |
892 | been a SMC chip after all. */ |
893 | retval = -ENODEV; |
894 | goto err_out; |
895 | } |
896 | |
897 | /* check if the revision register is something that I recognize. |
898 | These might need to be added to later, as future revisions |
899 | could be added. */ |
900 | SMC_SELECT_BANK(3); |
901 | revision_register = inw( port: ioaddr + REVISION ); |
902 | if ( !chip_ids[ ( revision_register >> 4 ) & 0xF ] ) { |
903 | /* I don't recognize this chip, so... */ |
904 | printk(CARDNAME ": IO %x: Unrecognized revision register:" |
905 | " %x, Contact author.\n" , ioaddr, revision_register); |
906 | |
907 | retval = -ENODEV; |
908 | goto err_out; |
909 | } |
910 | |
911 | /* at this point I'll assume that the chip is an SMC9xxx. |
912 | It might be prudent to check a listing of MAC addresses |
913 | against the hardware address, or do some other tests. */ |
914 | |
915 | pr_info_once("%s\n" , version); |
916 | |
917 | /* fill in some of the fields */ |
918 | dev->base_addr = ioaddr; |
919 | |
920 | /* |
921 | . Get the MAC address ( bank 1, regs 4 - 9 ) |
922 | */ |
923 | SMC_SELECT_BANK( 1 ); |
924 | for ( i = 0; i < 6; i += 2 ) { |
925 | word address; |
926 | |
927 | address = inw( port: ioaddr + ADDR0 + i ); |
928 | addr[i + 1] = address >> 8; |
929 | addr[i] = address & 0xFF; |
930 | } |
931 | eth_hw_addr_set(dev, addr); |
932 | |
933 | /* get the memory information */ |
934 | |
935 | SMC_SELECT_BANK( 0 ); |
936 | memory_info_register = inw( port: ioaddr + MIR ); |
937 | memory_cfg_register = inw( port: ioaddr + MCR ); |
938 | memory = ( memory_cfg_register >> 9 ) & 0x7; /* multiplier */ |
939 | memory *= 256 * ( memory_info_register & 0xFF ); |
940 | |
941 | /* |
942 | Now, I want to find out more about the chip. This is sort of |
943 | redundant, but it's cleaner to have it in both, rather than having |
944 | one VERY long probe procedure. |
945 | */ |
946 | SMC_SELECT_BANK(3); |
947 | revision_register = inw( port: ioaddr + REVISION ); |
948 | version_string = chip_ids[ ( revision_register >> 4 ) & 0xF ]; |
949 | if ( !version_string ) { |
950 | /* I shouldn't get here because this call was done before.... */ |
951 | retval = -ENODEV; |
952 | goto err_out; |
953 | } |
954 | |
955 | /* is it using AUI or 10BaseT ? */ |
956 | if ( dev->if_port == 0 ) { |
957 | SMC_SELECT_BANK(1); |
958 | configuration_register = inw( port: ioaddr + CONFIG ); |
959 | if ( configuration_register & CFG_AUI_SELECT ) |
960 | dev->if_port = 2; |
961 | else |
962 | dev->if_port = 1; |
963 | } |
964 | if_string = interfaces[ dev->if_port - 1 ]; |
965 | |
966 | /* now, reset the chip, and put it into a known state */ |
967 | smc_reset( ioaddr ); |
968 | |
969 | /* |
970 | . If dev->irq is 0, then the device has to be banged on to see |
971 | . what the IRQ is. |
972 | . |
973 | . This banging doesn't always detect the IRQ, for unknown reasons. |
974 | . a workaround is to reset the chip and try again. |
975 | . |
976 | . Interestingly, the DOS packet driver *SETS* the IRQ on the card to |
977 | . be what is requested on the command line. I don't do that, mostly |
978 | . because the card that I have uses a non-standard method of accessing |
979 | . the IRQs, and because this _should_ work in most configurations. |
980 | . |
981 | . Specifying an IRQ is done with the assumption that the user knows |
982 | . what (s)he is doing. No checking is done!!!! |
983 | . |
984 | */ |
985 | if ( dev->irq < 2 ) { |
986 | int trials; |
987 | |
988 | trials = 3; |
989 | while ( trials-- ) { |
990 | dev->irq = smc_findirq( ioaddr ); |
991 | if ( dev->irq ) |
992 | break; |
993 | /* kick the card and try again */ |
994 | smc_reset( ioaddr ); |
995 | } |
996 | } |
997 | if (dev->irq == 0 ) { |
998 | printk(CARDNAME": Couldn't autodetect your IRQ. Use irq=xx.\n" ); |
999 | retval = -ENODEV; |
1000 | goto err_out; |
1001 | } |
1002 | |
1003 | /* now, print out the card info, in a short format.. */ |
1004 | |
1005 | netdev_info(dev, format: "%s(r:%d) at %#3x IRQ:%d INTF:%s MEM:%db " , |
1006 | version_string, revision_register & 0xF, ioaddr, dev->irq, |
1007 | if_string, memory); |
1008 | /* |
1009 | . Print the Ethernet address |
1010 | */ |
1011 | netdev_info(dev, format: "ADDR: %pM\n" , dev->dev_addr); |
1012 | |
1013 | /* Grab the IRQ */ |
1014 | retval = request_irq(irq: dev->irq, handler: smc_interrupt, flags: 0, DRV_NAME, dev); |
1015 | if (retval) { |
1016 | netdev_warn(dev, format: "%s: unable to get IRQ %d (irqval=%d).\n" , |
1017 | DRV_NAME, dev->irq, retval); |
1018 | goto err_out; |
1019 | } |
1020 | |
1021 | dev->netdev_ops = &smc_netdev_ops; |
1022 | dev->watchdog_timeo = HZ/20; |
1023 | |
1024 | return 0; |
1025 | |
1026 | err_out: |
1027 | release_region(ioaddr, SMC_IO_EXTENT); |
1028 | return retval; |
1029 | } |
1030 | |
1031 | #if SMC_DEBUG > 2 |
1032 | static void print_packet( byte * buf, int length ) |
1033 | { |
1034 | #if 0 |
1035 | print_hex_dump_debug(DRV_NAME, DUMP_PREFIX_OFFSET, 16, 1, |
1036 | buf, length, true); |
1037 | #endif |
1038 | } |
1039 | #endif |
1040 | |
1041 | |
1042 | /* |
1043 | * Open and Initialize the board |
1044 | * |
1045 | * Set up everything, reset the card, etc .. |
1046 | * |
1047 | */ |
1048 | static int smc_open(struct net_device *dev) |
1049 | { |
1050 | int ioaddr = dev->base_addr; |
1051 | |
1052 | int i; /* used to set hw ethernet address */ |
1053 | |
1054 | /* clear out all the junk that was put here before... */ |
1055 | memset(netdev_priv(dev), 0, sizeof(struct smc_local)); |
1056 | |
1057 | /* reset the hardware */ |
1058 | |
1059 | smc_reset( ioaddr ); |
1060 | smc_enable( ioaddr ); |
1061 | |
1062 | /* Select which interface to use */ |
1063 | |
1064 | SMC_SELECT_BANK( 1 ); |
1065 | if ( dev->if_port == 1 ) { |
1066 | outw( inw( port: ioaddr + CONFIG ) & ~CFG_AUI_SELECT, |
1067 | port: ioaddr + CONFIG ); |
1068 | } |
1069 | else if ( dev->if_port == 2 ) { |
1070 | outw( inw( port: ioaddr + CONFIG ) | CFG_AUI_SELECT, |
1071 | port: ioaddr + CONFIG ); |
1072 | } |
1073 | |
1074 | /* |
1075 | According to Becker, I have to set the hardware address |
1076 | at this point, because the (l)user can set it with an |
1077 | ioctl. Easily done... |
1078 | */ |
1079 | SMC_SELECT_BANK( 1 ); |
1080 | for ( i = 0; i < 6; i += 2 ) { |
1081 | word address; |
1082 | |
1083 | address = dev->dev_addr[ i + 1 ] << 8 ; |
1084 | address |= dev->dev_addr[ i ]; |
1085 | outw( value: address, port: ioaddr + ADDR0 + i ); |
1086 | } |
1087 | |
1088 | netif_start_queue(dev); |
1089 | return 0; |
1090 | } |
1091 | |
1092 | /*-------------------------------------------------------- |
1093 | . Called by the kernel to send a packet out into the void |
1094 | . of the net. This routine is largely based on |
1095 | . skeleton.c, from Becker. |
1096 | .-------------------------------------------------------- |
1097 | */ |
1098 | |
1099 | static void smc_timeout(struct net_device *dev, unsigned int txqueue) |
1100 | { |
1101 | /* If we get here, some higher level has decided we are broken. |
1102 | There should really be a "kick me" function call instead. */ |
1103 | netdev_warn(dev, CARDNAME": transmit timed out, %s?\n" , |
1104 | tx_done(dev) ? "IRQ conflict" : "network cable problem" ); |
1105 | /* "kick" the adaptor */ |
1106 | smc_reset( ioaddr: dev->base_addr ); |
1107 | smc_enable( ioaddr: dev->base_addr ); |
1108 | netif_trans_update(dev); /* prevent tx timeout */ |
1109 | /* clear anything saved */ |
1110 | ((struct smc_local *)netdev_priv(dev))->saved_skb = NULL; |
1111 | netif_wake_queue(dev); |
1112 | } |
1113 | |
1114 | /*------------------------------------------------------------- |
1115 | . |
1116 | . smc_rcv - receive a packet from the card |
1117 | . |
1118 | . There is ( at least ) a packet waiting to be read from |
1119 | . chip-memory. |
1120 | . |
1121 | . o Read the status |
1122 | . o If an error, record it |
1123 | . o otherwise, read in the packet |
1124 | -------------------------------------------------------------- |
1125 | */ |
1126 | static void smc_rcv(struct net_device *dev) |
1127 | { |
1128 | int ioaddr = dev->base_addr; |
1129 | int packet_number; |
1130 | word status; |
1131 | word packet_length; |
1132 | |
1133 | /* assume bank 2 */ |
1134 | |
1135 | packet_number = inw( port: ioaddr + FIFO_PORTS ); |
1136 | |
1137 | if ( packet_number & FP_RXEMPTY ) { |
1138 | /* we got called , but nothing was on the FIFO */ |
1139 | PRINTK((CARDNAME ": WARNING: smc_rcv with nothing on FIFO.\n" )); |
1140 | /* don't need to restore anything */ |
1141 | return; |
1142 | } |
1143 | |
1144 | /* start reading from the start of the packet */ |
1145 | outw( PTR_READ | PTR_RCV | PTR_AUTOINC, port: ioaddr + POINTER ); |
1146 | |
1147 | /* First two words are status and packet_length */ |
1148 | status = inw( port: ioaddr + DATA_1 ); |
1149 | packet_length = inw( port: ioaddr + DATA_1 ); |
1150 | |
1151 | packet_length &= 0x07ff; /* mask off top bits */ |
1152 | |
1153 | PRINTK2(("RCV: STATUS %4x LENGTH %4x\n" , status, packet_length )); |
1154 | /* |
1155 | . the packet length contains 3 extra words : |
1156 | . status, length, and an extra word with an odd byte . |
1157 | */ |
1158 | packet_length -= 6; |
1159 | |
1160 | if ( !(status & RS_ERRORS ) ){ |
1161 | /* do stuff to make a new packet */ |
1162 | struct sk_buff * skb; |
1163 | byte * data; |
1164 | |
1165 | /* read one extra byte */ |
1166 | if ( status & RS_ODDFRAME ) |
1167 | packet_length++; |
1168 | |
1169 | /* set multicast stats */ |
1170 | if ( status & RS_MULTICAST ) |
1171 | dev->stats.multicast++; |
1172 | |
1173 | skb = netdev_alloc_skb(dev, length: packet_length + 5); |
1174 | if ( skb == NULL ) { |
1175 | dev->stats.rx_dropped++; |
1176 | goto done; |
1177 | } |
1178 | |
1179 | /* |
1180 | ! This should work without alignment, but it could be |
1181 | ! in the worse case |
1182 | */ |
1183 | |
1184 | skb_reserve( skb, len: 2 ); /* 16 bit alignment */ |
1185 | |
1186 | data = skb_put( skb, len: packet_length); |
1187 | |
1188 | #ifdef USE_32_BIT |
1189 | /* QUESTION: Like in the TX routine, do I want |
1190 | to send the DWORDs or the bytes first, or some |
1191 | mixture. A mixture might improve already slow PIO |
1192 | performance */ |
1193 | PRINTK3((" Reading %d dwords (and %d bytes)\n" , |
1194 | packet_length >> 2, packet_length & 3 )); |
1195 | insl(port: ioaddr + DATA_1 , addr: data, count: packet_length >> 2 ); |
1196 | /* read the left over bytes */ |
1197 | insb( port: ioaddr + DATA_1, addr: data + (packet_length & 0xFFFFFC), |
1198 | count: packet_length & 0x3 ); |
1199 | #else |
1200 | PRINTK3((" Reading %d words and %d byte(s)\n" , |
1201 | (packet_length >> 1 ), packet_length & 1 )); |
1202 | insw(ioaddr + DATA_1 , data, packet_length >> 1); |
1203 | if ( packet_length & 1 ) { |
1204 | data += packet_length & ~1; |
1205 | *(data++) = inb( ioaddr + DATA_1 ); |
1206 | } |
1207 | #endif |
1208 | #if SMC_DEBUG > 2 |
1209 | print_packet( data, packet_length ); |
1210 | #endif |
1211 | |
1212 | skb->protocol = eth_type_trans(skb, dev ); |
1213 | netif_rx(skb); |
1214 | dev->stats.rx_packets++; |
1215 | dev->stats.rx_bytes += packet_length; |
1216 | } else { |
1217 | /* error ... */ |
1218 | dev->stats.rx_errors++; |
1219 | |
1220 | if ( status & RS_ALGNERR ) dev->stats.rx_frame_errors++; |
1221 | if ( status & (RS_TOOSHORT | RS_TOOLONG ) ) |
1222 | dev->stats.rx_length_errors++; |
1223 | if ( status & RS_BADCRC) dev->stats.rx_crc_errors++; |
1224 | } |
1225 | |
1226 | done: |
1227 | /* error or good, tell the card to get rid of this packet */ |
1228 | outw( MC_RELEASE, port: ioaddr + MMU_CMD ); |
1229 | } |
1230 | |
1231 | |
1232 | /************************************************************************* |
1233 | . smc_tx |
1234 | . |
1235 | . Purpose: Handle a transmit error message. This will only be called |
1236 | . when an error, because of the AUTO_RELEASE mode. |
1237 | . |
1238 | . Algorithm: |
1239 | . Save pointer and packet no |
1240 | . Get the packet no from the top of the queue |
1241 | . check if it's valid ( if not, is this an error??? ) |
1242 | . read the status word |
1243 | . record the error |
1244 | . ( resend? Not really, since we don't want old packets around ) |
1245 | . Restore saved values |
1246 | ************************************************************************/ |
1247 | static void smc_tx( struct net_device * dev ) |
1248 | { |
1249 | int ioaddr = dev->base_addr; |
1250 | struct smc_local *lp = netdev_priv(dev); |
1251 | byte saved_packet; |
1252 | byte packet_no; |
1253 | word tx_status; |
1254 | |
1255 | |
1256 | /* assume bank 2 */ |
1257 | |
1258 | saved_packet = inb( port: ioaddr + PNR_ARR ); |
1259 | packet_no = inw( port: ioaddr + FIFO_PORTS ); |
1260 | packet_no &= 0x7F; |
1261 | |
1262 | /* select this as the packet to read from */ |
1263 | outb( value: packet_no, port: ioaddr + PNR_ARR ); |
1264 | |
1265 | /* read the first word from this packet */ |
1266 | outw( PTR_AUTOINC | PTR_READ, port: ioaddr + POINTER ); |
1267 | |
1268 | tx_status = inw( port: ioaddr + DATA_1 ); |
1269 | PRINTK3((CARDNAME": TX DONE STATUS: %4x\n" , tx_status)); |
1270 | |
1271 | dev->stats.tx_errors++; |
1272 | if ( tx_status & TS_LOSTCAR ) dev->stats.tx_carrier_errors++; |
1273 | if ( tx_status & TS_LATCOL ) { |
1274 | netdev_dbg(dev, CARDNAME": Late collision occurred on last xmit.\n" ); |
1275 | dev->stats.tx_window_errors++; |
1276 | } |
1277 | #if 0 |
1278 | if ( tx_status & TS_16COL ) { ... } |
1279 | #endif |
1280 | |
1281 | if ( tx_status & TS_SUCCESS ) { |
1282 | netdev_info(dev, CARDNAME": Successful packet caused interrupt\n" ); |
1283 | } |
1284 | /* re-enable transmit */ |
1285 | SMC_SELECT_BANK( 0 ); |
1286 | outw( inw( port: ioaddr + TCR ) | TCR_ENABLE, port: ioaddr + TCR ); |
1287 | |
1288 | /* kill the packet */ |
1289 | SMC_SELECT_BANK( 2 ); |
1290 | outw( MC_FREEPKT, port: ioaddr + MMU_CMD ); |
1291 | |
1292 | /* one less packet waiting for me */ |
1293 | lp->packets_waiting--; |
1294 | |
1295 | outb( value: saved_packet, port: ioaddr + PNR_ARR ); |
1296 | } |
1297 | |
1298 | /*-------------------------------------------------------------------- |
1299 | . |
1300 | . This is the main routine of the driver, to handle the device when |
1301 | . it needs some attention. |
1302 | . |
1303 | . So: |
1304 | . first, save state of the chipset |
1305 | . branch off into routines to handle each case, and acknowledge |
1306 | . each to the interrupt register |
1307 | . and finally restore state. |
1308 | . |
1309 | ---------------------------------------------------------------------*/ |
1310 | |
1311 | static irqreturn_t smc_interrupt(int irq, void * dev_id) |
1312 | { |
1313 | struct net_device *dev = dev_id; |
1314 | int ioaddr = dev->base_addr; |
1315 | struct smc_local *lp = netdev_priv(dev); |
1316 | |
1317 | byte status; |
1318 | word card_stats; |
1319 | byte mask; |
1320 | int timeout; |
1321 | /* state registers */ |
1322 | word saved_bank; |
1323 | word saved_pointer; |
1324 | int handled = 0; |
1325 | |
1326 | |
1327 | PRINTK3((CARDNAME": SMC interrupt started\n" )); |
1328 | |
1329 | saved_bank = inw( port: ioaddr + BANK_SELECT ); |
1330 | |
1331 | SMC_SELECT_BANK(2); |
1332 | saved_pointer = inw( port: ioaddr + POINTER ); |
1333 | |
1334 | mask = inb( port: ioaddr + INT_MASK ); |
1335 | /* clear all interrupts */ |
1336 | outb( value: 0, port: ioaddr + INT_MASK ); |
1337 | |
1338 | |
1339 | /* set a timeout value, so I don't stay here forever */ |
1340 | timeout = 4; |
1341 | |
1342 | PRINTK2((KERN_WARNING CARDNAME ": MASK IS %x\n" , mask)); |
1343 | do { |
1344 | /* read the status flag, and mask it */ |
1345 | status = inb( port: ioaddr + INTERRUPT ) & mask; |
1346 | if (!status ) |
1347 | break; |
1348 | |
1349 | handled = 1; |
1350 | |
1351 | PRINTK3((KERN_WARNING CARDNAME |
1352 | ": Handling interrupt status %x\n" , status)); |
1353 | |
1354 | if (status & IM_RCV_INT) { |
1355 | /* Got a packet(s). */ |
1356 | PRINTK2((KERN_WARNING CARDNAME |
1357 | ": Receive Interrupt\n" )); |
1358 | smc_rcv(dev); |
1359 | } else if (status & IM_TX_INT ) { |
1360 | PRINTK2((KERN_WARNING CARDNAME |
1361 | ": TX ERROR handled\n" )); |
1362 | smc_tx(dev); |
1363 | outb(IM_TX_INT, port: ioaddr + INTERRUPT ); |
1364 | } else if (status & IM_TX_EMPTY_INT ) { |
1365 | /* update stats */ |
1366 | SMC_SELECT_BANK( 0 ); |
1367 | card_stats = inw( port: ioaddr + COUNTER ); |
1368 | /* single collisions */ |
1369 | dev->stats.collisions += card_stats & 0xF; |
1370 | card_stats >>= 4; |
1371 | /* multiple collisions */ |
1372 | dev->stats.collisions += card_stats & 0xF; |
1373 | |
1374 | /* these are for when linux supports these statistics */ |
1375 | |
1376 | SMC_SELECT_BANK( 2 ); |
1377 | PRINTK2((KERN_WARNING CARDNAME |
1378 | ": TX_BUFFER_EMPTY handled\n" )); |
1379 | outb( IM_TX_EMPTY_INT, port: ioaddr + INTERRUPT ); |
1380 | mask &= ~IM_TX_EMPTY_INT; |
1381 | dev->stats.tx_packets += lp->packets_waiting; |
1382 | lp->packets_waiting = 0; |
1383 | |
1384 | } else if (status & IM_ALLOC_INT ) { |
1385 | PRINTK2((KERN_DEBUG CARDNAME |
1386 | ": Allocation interrupt\n" )); |
1387 | /* clear this interrupt so it doesn't happen again */ |
1388 | mask &= ~IM_ALLOC_INT; |
1389 | |
1390 | smc_hardware_send_packet( dev ); |
1391 | |
1392 | /* enable xmit interrupts based on this */ |
1393 | mask |= ( IM_TX_EMPTY_INT | IM_TX_INT ); |
1394 | |
1395 | /* and let the card send more packets to me */ |
1396 | netif_wake_queue(dev); |
1397 | |
1398 | PRINTK2((CARDNAME": Handoff done successfully.\n" )); |
1399 | } else if (status & IM_RX_OVRN_INT ) { |
1400 | dev->stats.rx_errors++; |
1401 | dev->stats.rx_fifo_errors++; |
1402 | outb( IM_RX_OVRN_INT, port: ioaddr + INTERRUPT ); |
1403 | } else if (status & IM_EPH_INT ) { |
1404 | PRINTK((CARDNAME ": UNSUPPORTED: EPH INTERRUPT\n" )); |
1405 | } else if (status & IM_ERCV_INT ) { |
1406 | PRINTK((CARDNAME ": UNSUPPORTED: ERCV INTERRUPT\n" )); |
1407 | outb( IM_ERCV_INT, port: ioaddr + INTERRUPT ); |
1408 | } |
1409 | } while ( timeout -- ); |
1410 | |
1411 | |
1412 | /* restore state register */ |
1413 | SMC_SELECT_BANK( 2 ); |
1414 | outb( value: mask, port: ioaddr + INT_MASK ); |
1415 | |
1416 | PRINTK3((KERN_WARNING CARDNAME ": MASK is now %x\n" , mask)); |
1417 | outw( value: saved_pointer, port: ioaddr + POINTER ); |
1418 | |
1419 | SMC_SELECT_BANK( saved_bank ); |
1420 | |
1421 | PRINTK3((CARDNAME ": Interrupt done\n" )); |
1422 | return IRQ_RETVAL(handled); |
1423 | } |
1424 | |
1425 | |
1426 | /*---------------------------------------------------- |
1427 | . smc_close |
1428 | . |
1429 | . this makes the board clean up everything that it can |
1430 | . and not talk to the outside world. Caused by |
1431 | . an 'ifconfig ethX down' |
1432 | . |
1433 | -----------------------------------------------------*/ |
1434 | static int smc_close(struct net_device *dev) |
1435 | { |
1436 | netif_stop_queue(dev); |
1437 | /* clear everything */ |
1438 | smc_shutdown( ioaddr: dev->base_addr ); |
1439 | |
1440 | /* Update the statistics here. */ |
1441 | return 0; |
1442 | } |
1443 | |
1444 | /*----------------------------------------------------------- |
1445 | . smc_set_multicast_list |
1446 | . |
1447 | . This routine will, depending on the values passed to it, |
1448 | . either make it accept multicast packets, go into |
1449 | . promiscuous mode ( for TCPDUMP and cousins ) or accept |
1450 | . a select set of multicast packets |
1451 | */ |
1452 | static void smc_set_multicast_list(struct net_device *dev) |
1453 | { |
1454 | short ioaddr = dev->base_addr; |
1455 | |
1456 | SMC_SELECT_BANK(0); |
1457 | if ( dev->flags & IFF_PROMISC ) |
1458 | outw( inw(port: ioaddr + RCR ) | RCR_PROMISC, port: ioaddr + RCR ); |
1459 | |
1460 | /* BUG? I never disable promiscuous mode if multicasting was turned on. |
1461 | Now, I turn off promiscuous mode, but I don't do anything to multicasting |
1462 | when promiscuous mode is turned on. |
1463 | */ |
1464 | |
1465 | /* Here, I am setting this to accept all multicast packets. |
1466 | I don't need to zero the multicast table, because the flag is |
1467 | checked before the table is |
1468 | */ |
1469 | else if (dev->flags & IFF_ALLMULTI) |
1470 | outw( inw(port: ioaddr + RCR ) | RCR_ALMUL, port: ioaddr + RCR ); |
1471 | |
1472 | /* We just get all multicast packets even if we only want them |
1473 | . from one source. This will be changed at some future |
1474 | . point. */ |
1475 | else if (!netdev_mc_empty(dev)) { |
1476 | /* support hardware multicasting */ |
1477 | |
1478 | /* be sure I get rid of flags I might have set */ |
1479 | outw( inw( port: ioaddr + RCR ) & ~(RCR_PROMISC | RCR_ALMUL), |
1480 | port: ioaddr + RCR ); |
1481 | /* NOTE: this has to set the bank, so make sure it is the |
1482 | last thing called. The bank is set to zero at the top */ |
1483 | smc_setmulticast(ioaddr, dev); |
1484 | } |
1485 | else { |
1486 | outw( inw( port: ioaddr + RCR ) & ~(RCR_PROMISC | RCR_ALMUL), |
1487 | port: ioaddr + RCR ); |
1488 | |
1489 | /* |
1490 | since I'm disabling all multicast entirely, I need to |
1491 | clear the multicast list |
1492 | */ |
1493 | SMC_SELECT_BANK( 3 ); |
1494 | outw( value: 0, port: ioaddr + MULTICAST1 ); |
1495 | outw( value: 0, port: ioaddr + MULTICAST2 ); |
1496 | outw( value: 0, port: ioaddr + MULTICAST3 ); |
1497 | outw( value: 0, port: ioaddr + MULTICAST4 ); |
1498 | } |
1499 | } |
1500 | |
1501 | #ifdef MODULE |
1502 | |
1503 | static struct net_device *devSMC9194; |
1504 | MODULE_LICENSE("GPL" ); |
1505 | |
1506 | module_param_hw(io, int, ioport, 0); |
1507 | module_param_hw(irq, int, irq, 0); |
1508 | module_param(ifport, int, 0); |
1509 | MODULE_PARM_DESC(io, "SMC 99194 I/O base address" ); |
1510 | MODULE_PARM_DESC(irq, "SMC 99194 IRQ number" ); |
1511 | MODULE_PARM_DESC(ifport, "SMC 99194 interface port (0-default, 1-TP, 2-AUI)" ); |
1512 | |
1513 | static int __init smc_init_module(void) |
1514 | { |
1515 | if (io == 0) |
1516 | printk(KERN_WARNING |
1517 | CARDNAME": You shouldn't use auto-probing with insmod!\n" ); |
1518 | |
1519 | /* copy the parameters from insmod into the device structure */ |
1520 | devSMC9194 = smc_init(-1); |
1521 | return PTR_ERR_OR_ZERO(devSMC9194); |
1522 | } |
1523 | module_init(smc_init_module); |
1524 | |
1525 | static void __exit smc_cleanup_module(void) |
1526 | { |
1527 | unregister_netdev(devSMC9194); |
1528 | free_irq(devSMC9194->irq, devSMC9194); |
1529 | release_region(devSMC9194->base_addr, SMC_IO_EXTENT); |
1530 | free_netdev(devSMC9194); |
1531 | } |
1532 | module_exit(smc_cleanup_module); |
1533 | |
1534 | #endif /* MODULE */ |
1535 | |