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*/
1 /*-
2 * Copyright (C) 1994 by PJD Weichmann & SWS Bern, Switzerland
3 *
4 * This software may be used and distributed according to the terms
5 * of the GNU Public License, incorporated herein by reference.
6 *
7 * Module : sk_g16.c
8 *
9 * Version : $Revision: 1.1 $
10 *
11 * Author : Patrick J.D. Weichmann
12 *
13 * Date Created : 94/05/26
14 * Last Updated : $Date: 1994/06/30 16:25:15 $
15 *
16 * Description : Schneider & Koch G16 Ethernet Device Driver for
17 * Linux Kernel >= 1.1.22
18 * Update History :
19 *
20 -*/
21
22 static const char *rcsid = "$Id: sk_g16.c,v 1.1 1994/06/30 16:25:15 root Exp $";
23
24 /*
25 * The Schneider & Koch (SK) G16 Network device driver is based
26 * on the 'ni6510' driver from Michael Hipp which can be found at
27 * ftp://sunsite.unc.edu/pub/Linux/system/Network/drivers/nidrivers.tar.gz
28 *
29 * Sources: 1) ni6510.c by M. Hipp
30 * 2) depca.c by D.C. Davies
31 * 3) skeleton.c by D. Becker
32 * 4) Am7990 Local Area Network Controller for Ethernet (LANCE),
33 * AMD, Pub. #05698, June 1989
34 *
35 * Many Thanks for helping me to get things working to:
36 *
37 * A. Cox (A.Cox@swansea.ac.uk)
38 * M. Hipp (mhipp@student.uni-tuebingen.de)
39 * R. Bolz (Schneider & Koch, Germany)
40 *
41 * See README.sk_g16 for details about limitations and bugs for the
42 * current version.
43 *
44 * To Do:
45 * - Support of SK_G8 and other SK Network Cards.
46 * - Autoset memory mapped RAM. Check for free memory and then
47 * configure RAM correctly.
48 * - SK_close should really set card in to initial state.
49 * - Test if IRQ 3 is not switched off. Use autoirq() functionality.
50 * (as in /drivers/net/skeleton.c)
51 * - Implement Multicast addressing. At minimum something like
52 * in depca.c.
53 * - Redo the statistics part.
54 * - Try to find out if the board is in 8 Bit or 16 Bit slot.
55 * If in 8 Bit mode don't use IRQ 11.
56 * - (Try to make it slightly faster.)
57 */
58
59 #include <linux/kernel.h>
60 #include <linux/sched.h>
61 #include <linux/ptrace.h>
62 #include <linux/fcntl.h>
63 #include <linux/ioport.h>
64 #include <linux/interrupt.h>
65 #include <linux/malloc.h>
66 #include <linux/ioport.h>
67 #include <linux/string.h>
68 #include <asm/system.h>
69 #include <asm/io.h>
70 #include <asm/bitops.h>
71 #include <linux/errno.h>
72
73 #include <linux/netdevice.h>
74 #include <linux/etherdevice.h>
75 #include <linux/skbuff.h>
76
77 #include "sk_g16.h"
78
79 /*
80 * Schneider & Koch Card Definitions
81 * =================================
82 */
83
84 #define SK_NAME "SK_G16"
85
86 /*
87 * SK_G16 Configuration
88 * --------------------
89 */
90
91 /*
92 * Abbreviations
93 * -------------
94 *
95 * RAM - used for the 16KB shared memory
96 * Boot_ROM, ROM - are used for referencing the BootEPROM
97 *
98 * SK_BOOT_ROM and SK_ADDR are symbolic constants used to configure
99 * the behaviour of the driver and the SK_G16.
100 *
101 * ! See sk_g16.install on how to install and configure the driver !
102 *
103 * SK_BOOT_ROM defines if the Boot_ROM should be switched off or not.
104 *
105 * SK_ADDR defines the address where the RAM will be mapped into the real
106 * host memory.
107 * valid addresses are from 0xa0000 to 0xfc000 in 16Kbyte steps.
108 */
109
110 #define SK_BOOT_ROM 1 /* 1=BootROM on 0=off */
111
112 #define SK_ADDR 0xcc000
113
114 /*
115 * In POS3 are bits A14-A19 of the address bus. These bits can be set
116 * to choose the RAM address. Thats why we only can choose the RAM address
117 * in 16KB steps.
118 */
119
120 #define POS_ADDR (rom_addr>>14) /* Do not change this line */
121
122 /*
123 * SK_G16 I/O PORT's + IRQ's + Boot_ROM locations
124 * ----------------------------------------------
125 */
126
127 /*
128 * As nearly every card has also SK_G16 a specified I/O Port region and
129 * only a few possible IRQ's.
130 * In the Installation Guide from Schneider & Koch is listed a possible
131 * Interrupt IRQ2. IRQ2 is always IRQ9 in boards with two cascaded interrupt
132 * controllers. So we use in SK_IRQS IRQ9.
133 */
134
135 /* Don't touch any of the following #defines. */
136
137 #define SK_IO_PORTS { 0x100, 0x180, 0x208, 0x220, 0x288, 0x320, 0x328, 0x390, 0 }
138
139 #define SK_IRQS { 3, 5, 9, 11, 0 }
140
141 #define SK_BOOT_ROM_LOCATIONS { 0xc0000, 0xc4000, 0xc8000, 0xcc000, 0xd0000, 0xd4000, 0xd8000, 0xdc000, 0 }
142
143 #define SK_BOOT_ROM_ID { 0x55, 0xaa, 0x10, 0x50, 0x06, 0x33 }
144
145 /*
146 * SK_G16 POS REGISTERS
147 * --------------------
148 */
149
150 /*
151 * SK_G16 has a Programmable Option Select (POS) Register.
152 * The POS is composed of 8 separate registers (POS0-7) which
153 * are I/O mapped on an address set by the W1 switch.
154 *
155 */
156
157 #define SK_POS_SIZE 8 /* 8 I/O Ports are used by SK_G16 */
158
159 #define SK_POS0 ioaddr /* Card-ID Low (R) */
160 #define SK_POS1 ioaddr+1 /* Card-ID High (R) */
161 #define SK_POS2 ioaddr+2 /* Card-Enable, Boot-ROM Disable (RW) */
162 #define SK_POS3 ioaddr+3 /* Base address of RAM */
163 #define SK_POS4 ioaddr+4 /* IRQ */
164
165 /* POS5 - POS7 are unused */
166
167 /*
168 * SK_G16 MAC PREFIX
169 * -----------------
170 */
171
172 /*
173 * Scheider & Koch manufacturer code (00:00:a5).
174 * This must be checked, that we are sure it is a SK card.
175 */
176
177 #define SK_MAC0 0x00
178 #define SK_MAC1 0x00
179 #define SK_MAC2 0x5a
180
181 /*
182 * SK_G16 ID
183 * ---------
184 */
185
186 /*
187 * If POS0,POS1 contain the following ID, then we know
188 * at which I/O Port Address we are.
189 */
190
191 #define SK_IDLOW 0xfd
192 #define SK_IDHIGH 0x6a
193
194
195 /*
196 * LANCE POS Bit definitions
197 * -------------------------
198 */
199
200 #define SK_ROM_RAM_ON (POS2_CARD)
201 #define SK_ROM_RAM_OFF (POS2_EPROM)
202 #define SK_ROM_ON (inb(SK_POS2) & POS2_CARD)
203 #define SK_ROM_OFF (inb(SK_POS2) | POS2_EPROM)
204 #define SK_RAM_ON (inb(SK_POS2) | POS2_CARD)
205 #define SK_RAM_OFF (inb(SK_POS2) & POS2_EPROM)
206
207 #define POS2_CARD 0x0001 /* 1 = SK_G16 on 0 = off */
208 #define POS2_EPROM 0x0002 /* 1 = Boot EPROM off 0 = on */
209
210 /*
211 * SK_G16 Memory mapped Registers
212 * ------------------------------
213 *
214 */
215
216 #define SK_IOREG (board->ioreg) /* LANCE data registers. */
217 #define SK_PORT (board->port) /* Control, Status register */
218 #define SK_IOCOM (board->iocom) /* I/O Command */
219
220 /*
221 * SK_G16 Status/Control Register bits
222 * -----------------------------------
223 *
224 * (C) Controlreg (S) Statusreg
225 */
226
227 /*
228 * Register transfer: 0 = no transfer
229 * 1 = transferring data between LANCE and I/O reg
230 */
231 #define SK_IORUN 0x20
232
233 /*
234 * LANCE interrupt: 0 = LANCE interrupt occurred
235 * 1 = no LANCE interrupt occurred
236 */
237 #define SK_IRQ 0x10
238
239 #define SK_RESET 0x08 /* Reset SK_CARD: 0 = RESET 1 = normal */
240 #define SK_RW 0x02 /* 0 = write to 1 = read from */
241 #define SK_ADR 0x01 /* 0 = REG DataPort 1 = RAP Reg addr port */
242
243
244 #define SK_RREG SK_RW /* Transferdirection to read from lance */
245 #define SK_WREG 0 /* Transferdirection to write to lance */
246 #define SK_RAP SK_ADR /* Destination Register RAP */
247 #define SK_RDATA 0 /* Destination Register REG DataPort */
248
249 /*
250 * SK_G16 I/O Command
251 * ------------------
252 */
253
254 /*
255 * Any bitcombination sets the internal I/O bit (transfer will start)
256 * when written to I/O Command
257 */
258
259 #define SK_DOIO 0x80 /* Do Transfer */
260
261 /*
262 * LANCE RAP (Register Address Port).
263 * ---------------------------------
264 */
265
266 /*
267 * The LANCE internal registers are selected through the RAP.
268 * The Registers are:
269 *
270 * CSR0 - Status and Control flags
271 * CSR1 - Low order bits of initialize block (bits 15:00)
272 * CSR2 - High order bits of initialize block (bits 07:00, 15:08 are reserved)
273 * CSR3 - Allows redefinition of the Bus Master Interface.
274 * This register must be set to 0x0002, which means BSWAP = 0,
275 * ACON = 1, BCON = 0;
276 *
277 */
278
279 #define CSR0 0x00
280 #define CSR1 0x01
281 #define CSR2 0x02
282 #define CSR3 0x03
283
284 /*
285 * General Definitions
286 * ===================
287 */
288
289 /*
290 * Set the number of Tx and Rx buffers, using Log_2(# buffers).
291 * We have 16KB RAM which can be accessed by the LANCE. In the
292 * memory are not only the buffers but also the ring descriptors and
293 * the initialize block.
294 * Don't change anything unless you really know what you do.
295 */
296
297 #define LC_LOG_TX_BUFFERS 1 /* (2 == 2^^1) 2 Transmit buffers */
298 #define LC_LOG_RX_BUFFERS 3 /* (8 == 2^^3) 8 Receive buffers */
299
300 /* Descriptor ring sizes */
301
302 #define TMDNUM (1 << (LC_LOG_TX_BUFFERS)) /* 2 Transmit descriptor rings */
303 #define RMDNUM (1 << (LC_LOG_RX_BUFFERS)) /* 8 Receive Buffers */
304
305 /* Define Mask for setting RMD, TMD length in the LANCE init_block */
306
307 #define TMDNUMMASK (LC_LOG_TX_BUFFERS << 29)
308 #define RMDNUMMASK (LC_LOG_RX_BUFFERS << 29)
309
310 /*
311 * Data Buffer size is set to maximum packet length.
312 */
313
314 #define PKT_BUF_SZ 1518
315
316 /*
317 * The number of low I/O ports used by the ethercard.
318 */
319
320 #define ETHERCARD_TOTAL_SIZE SK_POS_SIZE
321
322 /*
323 * Portreserve is there to mark the Card I/O Port region as used.
324 * Check_region is to check if the region at ioaddr with the size "size"
325 * is free or not.
326 * Snarf_region allocates the I/O Port region.
327 */
328
329 #ifndef HAVE_PORTRESERVE
330
331 #define check_region(ioaddr, size) 0
332 #define request_region(ioaddr, size,name) do ; while (0)
333
334 #endif
335
336 /*
337 * SK_DEBUG
338 *
339 * Here you can choose what level of debugging wanted.
340 *
341 * If SK_DEBUG and SK_DEBUG2 are undefined, then only the
342 * necessary messages will be printed.
343 *
344 * If SK_DEBUG is defined, there will be many debugging prints
345 * which can help to find some mistakes in configuration or even
346 * in the driver code.
347 *
348 * If SK_DEBUG2 is defined, many many messages will be printed
349 * which normally you don't need. I used this to check the interrupt
350 * routine.
351 *
352 * (If you define only SK_DEBUG2 then only the messages for
353 * checking interrupts will be printed!)
354 *
355 * Normal way of live is:
356 *
357 * For the whole thing get going let both symbolic constants
358 * undefined. If you face any problems and you know what's going
359 * on (you know something about the card and you can interpret some
360 * hex LANCE register output) then define SK_DEBUG
361 *
362 */
363
364 #undef SK_DEBUG /* debugging */
365 #undef SK_DEBUG2 /* debugging with more verbose report */
366
367 #ifdef SK_DEBUG
368 #define PRINTK(x) printk x
369 #else
370 #define PRINTK(x) /**/
371 #endif
372
373 #ifdef SK_DEBUG2
374 #define PRINTK2(x) printk x
375 #else
376 #define PRINTK2(x) /**/
377 #endif
378
379 /*
380 * SK_G16 RAM
381 *
382 * The components are memory mapped and can be set in a region from
383 * 0x00000 through 0xfc000 in 16KB steps.
384 *
385 * The Network components are: dual ported RAM, Prom, I/O Reg, Status-,
386 * Controlregister and I/O Command.
387 *
388 * dual ported RAM: This is the only memory region which the LANCE chip
389 * has access to. From the Lance it is addressed from 0x0000 to
390 * 0x3fbf. The host accesses it normally.
391 *
392 * PROM: The PROM obtains the ETHERNET-MAC-Address. It is realised as a
393 * 8-Bit PROM, this means only the 16 even addresses are used of the
394 * 32 Byte Address region. Access to a odd address results in invalid
395 * data.
396 *
397 * LANCE I/O Reg: The I/O Reg is build of 4 single Registers, Low-Byte Write,
398 * Hi-Byte Write, Low-Byte Read, Hi-Byte Read.
399 * Transfer from or to the LANCE is always in 16Bit so Low and High
400 * registers are always relevant.
401 *
402 * The Data from the Readregister is not the data in the Writeregister!!
403 *
404 * Port: Status- and Controlregister.
405 * Two different registers which share the same address, Status is
406 * read-only, Control is write-only.
407 *
408 * I/O Command:
409 * Any bitcombination written in here starts the transmission between
410 * Host and LANCE.
411 */
412
413 typedef struct
414 {
415 unsigned char ram[0x3fc0]; /* 16KB dual ported ram */
416 unsigned char rom[0x0020]; /* 32Byte PROM containing 6Byte MAC */
417 unsigned char res1[0x0010]; /* reserved */
418 unsigned volatile short ioreg;/* LANCE I/O Register */
419 unsigned volatile char port; /* Statusregister and Controlregister */
420 unsigned char iocom; /* I/O Command Register */
421 } SK_RAM;
422
423 /* struct */
424
425 /*
426 * This is the structure for the dual ported ram. We
427 * have exactly 16 320 Bytes. In here there must be:
428 *
429 * - Initialize Block (starting at a word boundary)
430 * - Receive and Transmit Descriptor Rings (quadword boundary)
431 * - Data Buffers (arbitrary boundary)
432 *
433 * This is because LANCE has on SK_G16 only access to the dual ported
434 * RAM and nowhere else.
435 */
436
437 struct SK_ram
438 {
439 struct init_block ib;
440 struct tmd tmde[TMDNUM];
441 struct rmd rmde[RMDNUM];
442 char tmdbuf[TMDNUM][PKT_BUF_SZ];
443 char rmdbuf[RMDNUM][PKT_BUF_SZ];
444 };
445
446 /*
447 * Structure where all necessary information is for ring buffer
448 * management and statistics.
449 */
450
451 struct priv
452 {
453 struct SK_ram *ram; /* dual ported ram structure */
454 struct rmd *rmdhead; /* start of receive ring descriptors */
455 struct tmd *tmdhead; /* start of transmit ring descriptors */
456 int rmdnum; /* actual used ring descriptor */
457 int tmdnum; /* actual transmit descriptor for transmitting data */
458 int tmdlast; /* last sent descriptor used for error handling, etc */
459 void *rmdbufs[RMDNUM]; /* pointer to the receive buffers */
460 void *tmdbufs[TMDNUM]; /* pointer to the transmit buffers */
461 struct enet_statistics stats; /* Device driver statistics */
462 };
463
464 /* global variable declaration */
465
466 /* IRQ map used to reserve a IRQ (see SK_open()) */
467
468 /* extern void *irq2dev_map[16]; */ /* Declared in <linux/ioport.h> */
469
470 /* static variables */
471
472 static SK_RAM *board; /* pointer to our memory mapped board components */
473
474 /* Macros */
475
476
477 /* Function Prototypes */
478
479 /*
480 * Device Driver functions
481 * -----------------------
482 * See for short explanation of each function its definitions header.
483 */
484
485 int SK_init(struct device *dev);
486 static int SK_probe(struct device *dev, short ioaddr);
487
488 static int SK_open(struct device *dev);
489 static int SK_send_packet(struct sk_buff *skb, struct device *dev);
490 static void SK_interrupt(int irq, struct pt_regs * regs);
491 static void SK_rxintr(struct device *dev);
492 static void SK_txintr(struct device *dev);
493 static int SK_close(struct device *dev);
494
495 static struct enet_statistics *SK_get_stats(struct device *dev);
496
497 unsigned int SK_rom_addr(void);
498
499 static void set_multicast_list(struct device *dev);
500
501 /*
502 * LANCE Functions
503 * ---------------
504 */
505
506 static int SK_lance_init(struct device *dev, unsigned short mode);
507 void SK_reset_board(void);
508 void SK_set_RAP(int reg_number);
509 int SK_read_reg(int reg_number);
510 int SK_rread_reg(void);
511 void SK_write_reg(int reg_number, int value);
512
513 /*
514 * Debugging functions
515 * -------------------
516 */
517
518 void SK_print_pos(struct device *dev, char *text);
519 void SK_print_dev(struct device *dev, char *text);
520 void SK_print_ram(struct device *dev);
521
522
523 /*-
524 * Function : SK_init
525 * Author : Patrick J.D. Weichmann
526 * Date Created : 94/05/26
527 *
528 * Description : Check for a SK_G16 network adaptor and initialize it.
529 * This function gets called by dev_init which initializes
530 * all Network devices.
531 *
532 * Parameters : I : struct device *dev - structure preconfigured
533 * from Space.c
534 * Return Value : 0 = Driver Found and initialized
535 * Errors : ENODEV - no device found
536 * ENXIO - not probed
537 * Globals : None
538 * Update History :
539 * YY/MM/DD uid Description
540 -*/
541
542 /*
543 * Check for a network adaptor of this type, and return '0' if one exists.
544 * If dev->base_addr == 0, probe all likely locations.
545 * If dev->base_addr == 1, always return failure.
546 * If dev->base_addr == 2, allocate space for the device and return success
547 * (detachable devices only).
548 */
549
550 int SK_init(struct device *dev)
/* ![[next]](../icons/right.png)
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*/
551 {
552 int ioaddr = 0; /* I/O port address used for POS regs */
553 int *port, ports[] = SK_IO_PORTS; /* SK_G16 supported ports */
554
555 /* get preconfigured base_addr from dev which is done in Space.c */
556 int base_addr = dev->base_addr;
557
558 PRINTK(("%s: %s", SK_NAME, rcsid));
559 rcsid = NULL; /* We do not want to use this further */
560
561 if (base_addr > 0x0ff) /* Check a single specified address */
562 {
563 /* Check if on specified address is a SK_G16 */
564
565 if ( (inb(SK_POS0) == SK_IDLOW) ||
566 (inb(SK_POS1) == SK_IDHIGH) )
567 {
568 return SK_probe(dev, base_addr);
569 }
570
571 return ENODEV; /* Sorry, but on specified address NO SK_G16 */
572 }
573 else if (base_addr > 0) /* Don't probe at all */
574 {
575 return ENXIO;
576 }
577
578 /* Autoprobe base_addr */
579
580 for (port = &ports[0]; *port; port++)
581 {
582 ioaddr = *port; /* we need ioaddr for accessing POS regs */
583
584 /* Check if I/O Port region is used by another board */
585
586 if (check_region(ioaddr, ETHERCARD_TOTAL_SIZE))
587 {
588 continue; /* Try next Port address */
589 }
590
591 /* Check if at ioaddr is a SK_G16 */
592
593 if ( !(inb(SK_POS0) == SK_IDLOW) ||
594 !(inb(SK_POS1) == SK_IDHIGH) )
595 {
596 continue; /* Try next Port address */
597 }
598
599 dev->base_addr = ioaddr; /* Set I/O Port Address */
600
601 if (SK_probe(dev, ioaddr) == 0)
602 {
603 return 0; /* Card found and initialized */
604 }
605 }
606
607 dev->base_addr = base_addr; /* Write back original base_addr */
608
609 return ENODEV; /* Failed to find or init driver */
610
611 } /* End of SK_init */
612
613
614 /*-
615 * Function : SK_probe
616 * Author : Patrick J.D. Weichmann
617 * Date Created : 94/05/26
618 *
619 * Description : This function is called by SK_init and
620 * does the main part of initialization.
621 *
622 * Parameters : I : struct device *dev - SK_G16 device structure
623 * I : short ioaddr - I/O Port address where POS is.
624 * Return Value : 0 = Initialization done
625 * Errors : ENODEV - No SK_G16 found
626 * -1 - Configuration problem
627 * Globals : irq2dev_map - Which device uses which IRQ
628 * : board - pointer to SK_RAM
629 * Update History :
630 * YY/MM/DD uid Description
631 * 94/06/30 pwe SK_ADDR now checked and at the correct place
632 -*/
633
634 int SK_probe(struct device *dev, short ioaddr)
/* ![[previous]](../icons/left.png)
*/
635 {
636 int i,j; /* Counters */
637 int sk_addr_flag = 0; /* SK ADDR correct? 1 - no, 0 - yes */
638 unsigned int rom_addr; /* used to store RAM address used for POS_ADDR */
639
640 struct priv *p; /* SK_G16 private structure */
641
642 if (SK_ADDR & 0x3fff || SK_ADDR < 0xa0000)
643 {
644
645 sk_addr_flag = 1;
646
647 /*
648 * Now here we could use a routine which searches for a free
649 * place in the ram and set SK_ADDR if found. TODO.
650 */
651 }
652
653 if (SK_BOOT_ROM) /* Shall we keep Boot_ROM on ? */
654 {
655 PRINTK(("## %s: SK_BOOT_ROM is set.\n", SK_NAME));
656
657 rom_addr = SK_rom_addr();
658
659 if (rom_addr == 0) /* No Boot_ROM found */
660 {
661 if (sk_addr_flag) /* No or Invalid SK_ADDR is defined */
662 {
663 printk("%s: SK_ADDR %#08x is not valid. Check configuration.\n",
664 dev->name, SK_ADDR);
665 return -1;
666 }
667
668 rom_addr = SK_ADDR; /* assign predefined address */
669
670 PRINTK(("## %s: NO Bootrom found \n", SK_NAME));
671
672 outb(SK_ROM_RAM_OFF, SK_POS2); /* Boot_ROM + RAM off */
673 outb(POS_ADDR, SK_POS3); /* Set RAM address */
674 outb(SK_RAM_ON, SK_POS2); /* enable RAM */
675 }
676 else if (rom_addr == SK_ADDR)
677 {
678 printk("%s: RAM + ROM are set to the same address %#08x\n"
679 " Check configuration. Now switching off Boot_ROM\n",
680 SK_NAME, rom_addr);
681
682 outb(SK_ROM_RAM_OFF, SK_POS2); /* Boot_ROM + RAM off*/
683 outb(POS_ADDR, SK_POS3); /* Set RAM address */
684 outb(SK_RAM_ON, SK_POS2); /* enable RAM */
685 }
686 else
687 {
688 PRINTK(("## %s: Found ROM at %#08x\n", SK_NAME, rom_addr));
689 PRINTK(("## %s: Keeping Boot_ROM on\n", SK_NAME));
690
691 if (sk_addr_flag) /* No or Invalid SK_ADDR is defined */
692 {
693 printk("%s: SK_ADDR %#08x is not valid. Check configuration.\n",
694 dev->name, SK_ADDR);
695 return -1;
696 }
697
698 rom_addr = SK_ADDR;
699
700 outb(SK_ROM_RAM_OFF, SK_POS2); /* Boot_ROM + RAM off */
701 outb(POS_ADDR, SK_POS3); /* Set RAM address */
702 outb(SK_ROM_RAM_ON, SK_POS2); /* RAM on, BOOT_ROM on */
703 }
704 }
705 else /* Don't keep Boot_ROM */
706 {
707 PRINTK(("## %s: SK_BOOT_ROM is not set.\n", SK_NAME));
708
709 if (sk_addr_flag) /* No or Invalid SK_ADDR is defined */
710 {
711 printk("%s: SK_ADDR %#08x is not valid. Check configuration.\n",
712 dev->name, SK_ADDR);
713 return -1;
714 }
715
716 rom_addr = SK_rom_addr(); /* Try to find a Boot_ROM */
717
718 /* IF we find a Boot_ROM disable it */
719
720 outb(SK_ROM_RAM_OFF, SK_POS2); /* Boot_ROM + RAM off */
721
722 /* We found a Boot_ROM and it's gone. Set RAM address on
723 * Boot_ROM address.
724 */
725
726 if (rom_addr)
727 {
728 printk("%s: We found Boot_ROM at %#08x. Now setting RAM on"
729 "that address\n", SK_NAME, rom_addr);
730
731 outb(POS_ADDR, SK_POS3); /* Set RAM on Boot_ROM address */
732 }
733 else /* We did not find a Boot_ROM, use predefined SK_ADDR for ram */
734 {
735 if (sk_addr_flag) /* No or Invalid SK_ADDR is defined */
736 {
737 printk("%s: SK_ADDR %#08x is not valid. Check configuration.\n",
738 dev->name, SK_ADDR);
739 return -1;
740 }
741
742 rom_addr = SK_ADDR;
743
744 outb(POS_ADDR, SK_POS3); /* Set RAM address */
745 }
746 outb(SK_RAM_ON, SK_POS2); /* enable RAM */
747 }
748
749 #ifdef SK_DEBUG
750 SK_print_pos(dev, "POS registers after ROM, RAM config");
751 #endif
752
753 board = (SK_RAM *) rom_addr;
754
755 /* Read in station address */
756 for (i = 0, j = 0; i < ETH_ALEN; i++, j+=2)
757 {
758 dev->dev_addr[i] = board->rom[j];
759 }
760
761 /* Check for manufacturer code */
762 if (!(dev->dev_addr[0] == SK_MAC0 &&
763 dev->dev_addr[1] == SK_MAC1 &&
764 dev->dev_addr[2] == SK_MAC2) )
765 {
766 PRINTK(("## %s: We did not find SK_G16 at RAM location.\n",
767 SK_NAME));
768 return ENODEV; /* NO SK_G16 found */
769 }
770
771 printk("%s: %s found at %#3x, HW addr: %#04x:%02x:%02x:%02x:%02x:%02x\n",
772 dev->name,
773 "Schneider & Koch Netcard",
774 (unsigned int) dev->base_addr,
775 dev->dev_addr[0],
776 dev->dev_addr[1],
777 dev->dev_addr[2],
778 dev->dev_addr[3],
779 dev->dev_addr[4],
780 dev->dev_addr[5]);
781
782 /* Grab the I/O Port region */
783 request_region(ioaddr, ETHERCARD_TOTAL_SIZE,"sk_g16");
784
785 /* Initialize device structure */
786
787 /* Allocate memory for private structure */
788 p = dev->priv = (void *) kmalloc(sizeof(struct priv), GFP_KERNEL);
789 if (p == NULL)
790 return -ENOMEM;
791 memset((char *) dev->priv, 0, sizeof(struct priv)); /* clear memory */
792
793 /* Assign our Device Driver functions */
794
795 dev->open = &SK_open;
796 dev->stop = &SK_close;
797 dev->hard_start_xmit = &SK_send_packet;
798 dev->get_stats = &SK_get_stats;
799 dev->set_multicast_list = &set_multicast_list;
800
801
802 /* Set the generic fields of the device structure */
803
804 ether_setup(dev);
805
806 dev->flags &= ~IFF_MULTICAST;
807
808 /* Initialize private structure */
809
810 p->ram = (struct SK_ram *) rom_addr; /* Set dual ported RAM addr */
811 p->tmdhead = &(p->ram)->tmde[0]; /* Set TMD head */
812 p->rmdhead = &(p->ram)->rmde[0]; /* Set RMD head */
813
814 /* Initialize buffer pointers */
815
816 for (i = 0; i < TMDNUM; i++)
817 {
818 p->tmdbufs[i] = &(p->ram)->tmdbuf[i];
819 }
820
821 for (i = 0; i < RMDNUM; i++)
822 {
823 p->rmdbufs[i] = &(p->ram)->rmdbuf[i];
824 }
825
826 #ifdef SK_DEBUG
827 SK_print_pos(dev, "End of SK_probe");
828 SK_print_ram(dev);
829 #endif
830
831 return 0; /* Initialization done */
832
833 } /* End of SK_probe() */
834
835
836 /*-
837 * Function : SK_open
838 * Author : Patrick J.D. Weichmann
839 * Date Created : 94/05/26
840 *
841 * Description : This function is called sometimes after booting
842 * when ifconfig program is run.
843 *
844 * This function requests an IRQ, sets the correct
845 * IRQ in the card. Then calls SK_lance_init() to
846 * init and start the LANCE chip. Then if everything is
847 * ok returns with 0 (OK), which means SK_G16 is now
848 * opened and operational.
849 *
850 * (Called by dev_open() /net/inet/dev.c)
851 *
852 * Parameters : I : struct device *dev - SK_G16 device structure
853 * Return Value : 0 - Device opened
854 * Errors : -EAGAIN - Open failed
855 * Globals : irq2dev_map - which device uses which irq
856 * Side Effects : None
857 * Update History :
858 * YY/MM/DD uid Description
859 -*/
860
861 static int SK_open(struct device *dev)
/* */
862 {
863 int i = 0;
864 int irqval = 0;
865 int ioaddr = dev->base_addr;
866
867 int irqtab[] = SK_IRQS;
868
869 struct priv *p = (struct priv *)dev->priv;
870
871 PRINTK(("## %s: At beginning of SK_open(). CSR0: %#06x\n",
872 SK_NAME, SK_read_reg(CSR0)));
873
874 if (dev->irq == 0) /* Autoirq */
875 {
876 i = 0;
877
878 /*
879 * Check if one IRQ out of SK_IRQS is free and install
880 * interrupt handler.
881 * Most done by request_irq().
882 * irqval: 0 - interrupt handler installed for IRQ irqtab[i]
883 * -EBUSY - interrupt busy
884 * -EINVAL - irq > 15 or handler = NULL
885 */
886
887 do
888 {
889 irqval = request_irq(irqtab[i], &SK_interrupt, 0, "sk_g16");
890 i++;
891 } while (irqval && irqtab[i]);
892
893 if (irqval) /* We tried every possible IRQ but no success */
894 {
895 printk("%s: unable to get an IRQ\n", dev->name);
896 return -EAGAIN;
897 }
898
899 dev->irq = irqtab[--i];
900
901 outb(i<<2, SK_POS4); /* Set Card on probed IRQ */
902
903 }
904 else if (dev->irq == 2) /* IRQ2 is always IRQ9 */
905 {
906 if (request_irq(9, &SK_interrupt, 0, "sk_g16"))
907 {
908 printk("%s: unable to get IRQ 9\n", dev->name);
909 return -EAGAIN;
910 }
911 dev->irq = 9;
912
913 /*
914 * Now we set card on IRQ2.
915 * This can be confusing, but remember that IRQ2 on the network
916 * card is in reality IRQ9
917 */
918 outb(0x08, SK_POS4); /* set card to IRQ2 */
919
920 }
921 else /* Check IRQ as defined in Space.c */
922 {
923 int i = 0;
924
925 /* check if IRQ free and valid. Then install Interrupt handler */
926
927 if (request_irq(dev->irq, &SK_interrupt, 0, "sk_g16"))
928 {
929 printk("%s: unable to get selected IRQ\n", dev->name);
930 return -EAGAIN;
931 }
932
933 switch(dev->irq)
934 {
935 case 3: i = 0;
936 break;
937 case 5: i = 1;
938 break;
939 case 2: i = 2;
940 break;
941 case 11:i = 3;
942 break;
943 default:
944 printk("%s: Preselected IRQ %d is invalid for %s boards",
945 dev->name,
946 dev->irq,
947 SK_NAME);
948 return -EAGAIN;
949 }
950
951 outb(i<<2, SK_POS4); /* Set IRQ on card */
952 }
953
954 irq2dev_map[dev->irq] = dev; /* Set IRQ as used by us */
955
956 printk("%s: Schneider & Koch G16 at %#3x, IRQ %d, shared mem at %#08x\n",
957 dev->name, (unsigned int)dev->base_addr,
958 (int) dev->irq, (unsigned int) p->ram);
959
960 if (!(i = SK_lance_init(dev, 0))) /* LANCE init OK? */
961 {
962
963
964 dev->tbusy = 0;
965 dev->interrupt = 0;
966 dev->start = 1;
967
968 #ifdef SK_DEBUG
969
970 /*
971 * This debug block tries to stop LANCE,
972 * reinit LANCE with transmitter and receiver disabled,
973 * then stop again and reinit with NORMAL_MODE
974 */
975
976 printk("## %s: After lance init. CSR0: %#06x\n",
977 SK_NAME, SK_read_reg(CSR0));
978 SK_write_reg(CSR0, CSR0_STOP);
979 printk("## %s: LANCE stopped. CSR0: %#06x\n",
980 SK_NAME, SK_read_reg(CSR0));
981 SK_lance_init(dev, MODE_DTX | MODE_DRX);
982 printk("## %s: Reinit with DTX + DRX off. CSR0: %#06x\n",
983 SK_NAME, SK_read_reg(CSR0));
984 SK_write_reg(CSR0, CSR0_STOP);
985 printk("## %s: LANCE stopped. CSR0: %#06x\n",
986 SK_NAME, SK_read_reg(CSR0));
987 SK_lance_init(dev, MODE_NORMAL);
988 printk("## %s: LANCE back to normal mode. CSR0: %#06x\n",
989 SK_NAME, SK_read_reg(CSR0));
990 SK_print_pos(dev, "POS regs before returning OK");
991
992 #endif /* SK_DEBUG */
993
994 return 0; /* SK_open() is successful */
995 }
996 else /* LANCE init failed */
997 {
998
999 PRINTK(("## %s: LANCE init failed: CSR0: %#06x\n",
1000 SK_NAME, SK_read_reg(CSR0)));
1001
1002 dev->start = 0; /* Device not ready */
1003 return -EAGAIN;
1004 }
1005
1006 } /* End of SK_open() */
1007
1008
1009 /*-
1010 * Function : SK_lance_init
1011 * Author : Patrick J.D. Weichmann
1012 * Date Created : 94/05/26
1013 *
1014 * Description : Reset LANCE chip, fill RMD, TMD structures with
1015 * start values and Start LANCE.
1016 *
1017 * Parameters : I : struct device *dev - SK_G16 device structure
1018 * I : int mode - put LANCE into "mode" see data-sheet for
1019 * more info.
1020 * Return Value : 0 - Init done
1021 * Errors : -1 - Init failed
1022 * Update History :
1023 * YY/MM/DD uid Description
1024 -*/
1025
1026 static int SK_lance_init(struct device *dev, unsigned short mode)
/* */
1027 {
1028 int i;
1029 struct priv *p = (struct priv *) dev->priv;
1030 struct tmd *tmdp;
1031 struct rmd *rmdp;
1032
1033 PRINTK(("## %s: At beginning of LANCE init. CSR0: %#06x\n",
1034 SK_NAME, SK_read_reg(CSR0)));
1035
1036 /* Reset LANCE */
1037 SK_reset_board();
1038
1039 /* Initialize TMD's with start values */
1040 p->tmdnum = 0; /* First descriptor for transmitting */
1041 p->tmdlast = 0; /* First descriptor for reading stats */
1042
1043 for (i = 0; i < TMDNUM; i++) /* Init all TMD's */
1044 {
1045 tmdp = p->tmdhead + i;
1046
1047 tmdp->u.buffer = (unsigned long) p->tmdbufs[i]; /* assign buffer */
1048
1049 /* Mark TMD as start and end of packet */
1050 tmdp->u.s.status = TX_STP | TX_ENP;
1051 }
1052
1053
1054 /* Initialize RMD's with start values */
1055
1056 p->rmdnum = 0; /* First RMD which will be used */
1057
1058 for (i = 0; i < RMDNUM; i++) /* Init all RMD's */
1059 {
1060 rmdp = p->rmdhead + i;
1061
1062
1063 rmdp->u.buffer = (unsigned long) p->rmdbufs[i]; /* assign buffer */
1064
1065 /*
1066 * LANCE must be owner at beginning so that he can fill in
1067 * receiving packets, set status and release RMD
1068 */
1069
1070 rmdp->u.s.status = RX_OWN;
1071
1072 rmdp->blen = -PKT_BUF_SZ; /* Buffer Size in a two's complement */
1073
1074 rmdp->mlen = 0; /* init message length */
1075
1076 }
1077
1078 /* Fill LANCE Initialize Block */
1079
1080 (p->ram)->ib.mode = mode; /* Set operation mode */
1081
1082 for (i = 0; i < ETH_ALEN; i++) /* Set physical address */
1083 {
1084 (p->ram)->ib.paddr[i] = dev->dev_addr[i];
1085 }
1086
1087 for (i = 0; i < 8; i++) /* Set multicast, logical address */
1088 {
1089 (p->ram)->ib.laddr[i] = 0; /* We do not use logical addressing */
1090 }
1091
1092 /* Set ring descriptor pointers and set number of descriptors */
1093
1094 (p->ram)->ib.rdrp = (int) p->rmdhead | RMDNUMMASK;
1095 (p->ram)->ib.tdrp = (int) p->tmdhead | TMDNUMMASK;
1096
1097 /* Prepare LANCE Control and Status Registers */
1098
1099 cli();
1100
1101 SK_write_reg(CSR3, CSR3_ACON); /* Ale Control !!!THIS MUST BE SET!!!! */
1102
1103 /*
1104 * LANCE addresses the RAM from 0x0000 to 0x3fbf and has no access to
1105 * PC Memory locations.
1106 *
1107 * In structure SK_ram is defined that the first thing in ram
1108 * is the initialization block. So his address is for LANCE always
1109 * 0x0000
1110 *
1111 * CSR1 contains low order bits 15:0 of initialization block address
1112 * CSR2 is built of:
1113 * 7:0 High order bits 23:16 of initialization block address
1114 * 15:8 reserved, must be 0
1115 */
1116
1117 /* Set initialization block address (must be on word boundary) */
1118 SK_write_reg(CSR1, 0); /* Set low order bits 15:0 */
1119 SK_write_reg(CSR2, 0); /* Set high order bits 23:16 */
1120
1121
1122 PRINTK(("## %s: After setting CSR1-3. CSR0: %#06x\n",
1123 SK_NAME, SK_read_reg(CSR0)));
1124
1125 /* Initialize LANCE */
1126
1127 /*
1128 * INIT = Initialize, when set, causes the LANCE to begin the
1129 * initialization procedure and access the Init Block.
1130 */
1131
1132 SK_write_reg(CSR0, CSR0_INIT);
1133
1134 sti();
1135
1136 /* Wait until LANCE finished initialization */
1137
1138 SK_set_RAP(CSR0); /* Register Address Pointer to CSR0 */
1139
1140 for (i = 0; (i < 100) && !(SK_rread_reg() & CSR0_IDON); i++)
1141 ; /* Wait until init done or go ahead if problems (i>=100) */
1142
1143 if (i >= 100) /* Something is wrong ! */
1144 {
1145 printk("%s: can't init am7990, status: %04x "
1146 "init_block: %#08x\n",
1147 dev->name, (int) SK_read_reg(CSR0),
1148 (unsigned int) &(p->ram)->ib);
1149
1150 #ifdef SK_DEBUG
1151 SK_print_pos(dev, "LANCE INIT failed");
1152 SK_print_dev(dev,"Device Structure:");
1153 #endif
1154
1155 return -1; /* LANCE init failed */
1156 }
1157
1158 PRINTK(("## %s: init done after %d ticks\n", SK_NAME, i));
1159
1160 /* Clear Initialize done, enable Interrupts, start LANCE */
1161
1162 SK_write_reg(CSR0, CSR0_IDON | CSR0_INEA | CSR0_STRT);
1163
1164 PRINTK(("## %s: LANCE started. CSR0: %#06x\n", SK_NAME,
1165 SK_read_reg(CSR0)));
1166
1167 return 0; /* LANCE is up and running */
1168
1169 } /* End of SK_lance_init() */
1170
1171
1172
1173 /*-
1174 * Function : SK_send_packet
1175 * Author : Patrick J.D. Weichmann
1176 * Date Created : 94/05/27
1177 *
1178 * Description : Writes an socket buffer into a transmit descriptor
1179 * and starts transmission.
1180 *
1181 * Parameters : I : struct sk_buff *skb - packet to transfer
1182 * I : struct device *dev - SK_G16 device structure
1183 * Return Value : 0 - OK
1184 * 1 - Could not transmit (dev_queue_xmit will queue it)
1185 * and try to sent it later
1186 * Globals : None
1187 * Side Effects : None
1188 * Update History :
1189 * YY/MM/DD uid Description
1190 -*/
1191
1192 static int SK_send_packet(struct sk_buff *skb, struct device *dev)
/* */
1193 {
1194 struct priv *p = (struct priv *) dev->priv;
1195 struct tmd *tmdp;
1196
1197 if (dev->tbusy)
1198 {
1199 /* if Transmitter more than 150ms busy -> time_out */
1200
1201 int tickssofar = jiffies - dev->trans_start;
1202 if (tickssofar < 15)
1203 {
1204 return 1; /* We have to try transmit later */
1205 }
1206
1207 printk("%s: xmitter timed out, try to restart!\n", dev->name);
1208
1209 SK_lance_init(dev, MODE_NORMAL); /* Reinit LANCE */
1210
1211 dev->tbusy = 0; /* Clear Transmitter flag */
1212
1213 dev->trans_start = jiffies; /* Mark Start of transmission */
1214
1215 }
1216
1217 /*
1218 * If some upper Layer thinks we missed a transmit done interrupt
1219 * we are passed NULL.
1220 * (dev_queue_xmit net/inet/dev.c
1221 */
1222
1223 if (skb == NULL)
1224 {
1225 /*
1226 * Dequeue packets from transmit queue and send them.
1227 */
1228 dev_tint(dev);
1229
1230 return 0;
1231 }
1232
1233 PRINTK2(("## %s: SK_send_packet() called, CSR0 %#04x.\n",
1234 SK_NAME, SK_read_reg(CSR0)));
1235
1236
1237 /*
1238 * Block a timer-based transmit from overlapping.
1239 * This means check if we are already in.
1240 */
1241
1242 if (set_bit(0, (void *) &dev->tbusy) != 0) /* dev->tbusy already set ? */
1243 {
1244 printk("%s: Transmitter access conflict.\n", dev->name);
1245 }
1246 else
1247 {
1248 /* Evaluate Packet length */
1249 short len = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
1250
1251 tmdp = p->tmdhead + p->tmdnum; /* Which descriptor for transmitting */
1252
1253 /* Fill in Transmit Message Descriptor */
1254
1255 /* Copy data into dual ported ram */
1256
1257 memcpy((char *) (tmdp->u.buffer & 0x00ffffff), (char *)skb->data,
1258 skb->len);
1259
1260 tmdp->blen = -len; /* set length to transmit */
1261
1262 /*
1263 * Packet start and end is always set because we use the maximum
1264 * packet length as buffer length.
1265 * Relinquish ownership to LANCE
1266 */
1267
1268 tmdp->u.s.status = TX_OWN | TX_STP | TX_ENP;
1269
1270 /* Start Demand Transmission */
1271 SK_write_reg(CSR0, CSR0_TDMD | CSR0_INEA);
1272
1273 dev->trans_start = jiffies; /* Mark start of transmission */
1274
1275 /* Set pointer to next transmit buffer */
1276 p->tmdnum++;
1277 p->tmdnum &= TMDNUM-1;
1278
1279 /* Do we own the next transmit buffer ? */
1280 if (! ((p->tmdhead + p->tmdnum)->u.s.status & TX_OWN) )
1281 {
1282 /*
1283 * We own next buffer and are ready to transmit, so
1284 * clear busy flag
1285 */
1286 dev->tbusy = 0;
1287 }
1288 }
1289 dev_kfree_skb(skb, FREE_WRITE);
1290 return 0;
1291 } /* End of SK_send_packet */
1292
1293
1294 /*-
1295 * Function : SK_interrupt
1296 * Author : Patrick J.D. Weichmann
1297 * Date Created : 94/05/27
1298 *
1299 * Description : SK_G16 interrupt handler which checks for LANCE
1300 * Errors, handles transmit and receive interrupts
1301 *
1302 * Parameters : I : int irq, struct pt_regs * regs -
1303 * Return Value : None
1304 * Errors : None
1305 * Globals : None
1306 * Side Effects : None
1307 * Update History :
1308 * YY/MM/DD uid Description
1309 -*/
1310
1311 static void SK_interrupt(int irq, struct pt_regs * regs)
/* */
1312 {
1313 int csr0;
1314 struct device *dev = (struct device *) irq2dev_map[irq];
1315 struct priv *p = (struct priv *) dev->priv;
1316
1317
1318 PRINTK2(("## %s: SK_interrupt(). status: %#06x\n",
1319 SK_NAME, SK_read_reg(CSR0)));
1320
1321 if (dev == NULL)
1322 {
1323 printk("SK_interrupt(): IRQ %d for unknown device.\n", irq);
1324 }
1325
1326
1327 if (dev->interrupt)
1328 {
1329 printk("%s: Re-entering the interrupt handler.\n", dev->name);
1330 }
1331
1332 csr0 = SK_read_reg(CSR0); /* store register for checking */
1333
1334 dev->interrupt = 1; /* We are handling an interrupt */
1335
1336 /*
1337 * Acknowledge all of the current interrupt sources, disable
1338 * Interrupts (INEA = 0)
1339 */
1340
1341 SK_write_reg(CSR0, csr0 & CSR0_CLRALL);
1342
1343 if (csr0 & CSR0_ERR) /* LANCE Error */
1344 {
1345 printk("%s: error: %04x\n", dev->name, csr0);
1346
1347 if (csr0 & CSR0_MISS) /* No place to store packet ? */
1348 {
1349 p->stats.rx_dropped++;
1350 }
1351 }
1352
1353 if (csr0 & CSR0_RINT) /* Receive Interrupt (packet arrived) */
1354 {
1355 SK_rxintr(dev);
1356 }
1357
1358 if (csr0 & CSR0_TINT) /* Transmit interrupt (packet sent) */
1359 {
1360 SK_txintr(dev);
1361 }
1362
1363 SK_write_reg(CSR0, CSR0_INEA); /* Enable Interrupts */
1364
1365 dev->interrupt = 0; /* We are out */
1366 } /* End of SK_interrupt() */
1367
1368
1369 /*-
1370 * Function : SK_txintr
1371 * Author : Patrick J.D. Weichmann
1372 * Date Created : 94/05/27
1373 *
1374 * Description : After sending a packet we check status, update
1375 * statistics and relinquish ownership of transmit
1376 * descriptor ring.
1377 *
1378 * Parameters : I : struct device *dev - SK_G16 device structure
1379 * Return Value : None
1380 * Errors : None
1381 * Globals : None
1382 * Update History :
1383 * YY/MM/DD uid Description
1384 -*/
1385
1386 static void SK_txintr(struct device *dev)
/* */
1387 {
1388 int tmdstat;
1389 struct tmd *tmdp;
1390 struct priv *p = (struct priv *) dev->priv;
1391
1392
1393 PRINTK2(("## %s: SK_txintr() status: %#06x\n",
1394 SK_NAME, SK_read_reg(CSR0)));
1395
1396 tmdp = p->tmdhead + p->tmdlast; /* Which buffer we sent at last ? */
1397
1398 /* Set next buffer */
1399 p->tmdlast++;
1400 p->tmdlast &= TMDNUM-1;
1401
1402 tmdstat = tmdp->u.s.status & 0xff00; /* filter out status bits 15:08 */
1403
1404 /*
1405 * We check status of transmitted packet.
1406 * see LANCE data-sheet for error explanation
1407 */
1408 if (tmdstat & TX_ERR) /* Error occurred */
1409 {
1410 printk("%s: TX error: %04x %04x\n", dev->name, (int) tmdstat,
1411 (int) tmdp->status2);
1412
1413 if (tmdp->status2 & TX_TDR) /* TDR problems? */
1414 {
1415 printk("%s: tdr-problems \n", dev->name);
1416 }
1417
1418 if (tmdp->status2 & TX_RTRY) /* Failed in 16 attempts to transmit ? */
1419 p->stats.tx_aborted_errors++;
1420 if (tmdp->status2 & TX_LCOL) /* Late collision ? */
1421 p->stats.tx_window_errors++;
1422 if (tmdp->status2 & TX_LCAR) /* Loss of Carrier ? */
1423 p->stats.tx_carrier_errors++;
1424 if (tmdp->status2 & TX_UFLO) /* Underflow error ? */
1425 {
1426 p->stats.tx_fifo_errors++;
1427
1428 /*
1429 * If UFLO error occurs it will turn transmitter of.
1430 * So we must reinit LANCE
1431 */
1432
1433 SK_lance_init(dev, MODE_NORMAL);
1434 }
1435
1436 p->stats.tx_errors++;
1437
1438 tmdp->status2 = 0; /* Clear error flags */
1439 }
1440 else if (tmdstat & TX_MORE) /* Collisions occurred ? */
1441 {
1442 /*
1443 * Here I have a problem.
1444 * I only know that there must be one or up to 15 collisions.
1445 * Thats why TX_MORE is set, because after 16 attempts TX_RTRY
1446 * will be set which means couldn't send packet aborted transfer.
1447 *
1448 * First I did not have this in but then I thought at minimum
1449 * we see that something was not ok.
1450 * If anyone knows something better than this to handle this
1451 * please report it. (see Email addresses in the README file)
1452 */
1453
1454 p->stats.collisions++;
1455 }
1456 else /* Packet sent without any problems */
1457 {
1458 p->stats.tx_packets++;
1459 }
1460
1461 /*
1462 * We mark transmitter not busy anymore, because now we have a free
1463 * transmit descriptor which can be filled by SK_send_packet and
1464 * afterwards sent by the LANCE
1465 */
1466
1467 dev->tbusy = 0;
1468
1469 /*
1470 * mark_bh(NET_BH);
1471 * This will cause net_bh() to run after this interrupt handler.
1472 *
1473 * The function which do handle slow IRQ parts is do_bottom_half()
1474 * which runs at normal kernel priority, that means all interrupt are
1475 * enabled. (see kernel/irq.c)
1476 *
1477 * net_bh does something like this:
1478 * - check if already in net_bh
1479 * - try to transmit something from the send queue
1480 * - if something is in the receive queue send it up to higher
1481 * levels if it is a known protocol
1482 * - try to transmit something from the send queue
1483 */
1484
1485 mark_bh(NET_BH);
1486
1487 } /* End of SK_txintr() */
1488
1489
1490 /*-
1491 * Function : SK_rxintr
1492 * Author : Patrick J.D. Weichmann
1493 * Date Created : 94/05/27
1494 *
1495 * Description : Buffer sent, check for errors, relinquish ownership
1496 * of the receive message descriptor.
1497 *
1498 * Parameters : I : SK_G16 device structure
1499 * Return Value : None
1500 * Globals : None
1501 * Update History :
1502 * YY/MM/DD uid Description
1503 -*/
1504
1505 static void SK_rxintr(struct device *dev)
/* */
1506 {
1507
1508 struct rmd *rmdp;
1509 int rmdstat;
1510 struct priv *p = (struct priv *) dev->priv;
1511
1512 PRINTK2(("## %s: SK_rxintr(). CSR0: %#06x\n",
1513 SK_NAME, SK_read_reg(CSR0)));
1514
1515 rmdp = p->rmdhead + p->rmdnum;
1516
1517 /* As long as we own the next entry, check status and send
1518 * it up to higher layer
1519 */
1520
1521 while (!( (rmdstat = rmdp->u.s.status) & RX_OWN))
1522 {
1523 /*
1524 * Start and end of packet must be set, because we use
1525 * the ethernet maximum packet length (1518) as buffer size.
1526 *
1527 * Because our buffers are at maximum OFLO and BUFF errors are
1528 * not to be concerned (see Data sheet)
1529 */
1530
1531 if ((rmdstat & (RX_STP | RX_ENP)) != (RX_STP | RX_ENP))
1532 {
1533 /* Start of a frame > 1518 Bytes ? */
1534
1535 if (rmdstat & RX_STP)
1536 {
1537 p->stats.rx_errors++; /* bad packet received */
1538 p->stats.rx_length_errors++; /* packet to long */
1539
1540 printk("%s: packet too long\n", dev->name);
1541 }
1542
1543 /*
1544 * All other packets will be ignored until a new frame with
1545 * start (RX_STP) set follows.
1546 *
1547 * What we do is just give descriptor free for new incoming
1548 * packets.
1549 */
1550
1551 rmdp->u.s.status = RX_OWN; /* Relinquish ownership to LANCE */
1552
1553 }
1554 else if (rmdstat & RX_ERR) /* Receive Error ? */
1555 {
1556 printk("%s: RX error: %04x\n", dev->name, (int) rmdstat);
1557
1558 p->stats.rx_errors++;
1559
1560 if (rmdstat & RX_FRAM) p->stats.rx_frame_errors++;
1561 if (rmdstat & RX_CRC) p->stats.rx_crc_errors++;
1562
1563 rmdp->u.s.status = RX_OWN; /* Relinquish ownership to LANCE */
1564
1565 }
1566 else /* We have a packet which can be queued for the upper layers */
1567 {
1568
1569 int len = (rmdp->mlen & 0x0fff); /* extract message length from receive buffer */
1570 struct sk_buff *skb;
1571
1572 skb = dev_alloc_skb(len+2); /* allocate socket buffer */
1573
1574 if (skb == NULL) /* Could not get mem ? */
1575 {
1576
1577 /*
1578 * Couldn't allocate sk_buffer so we give descriptor back
1579 * to Lance, update statistics and go ahead.
1580 */
1581
1582 rmdp->u.s.status = RX_OWN; /* Relinquish ownership to LANCE */
1583 printk("%s: Couldn't allocate sk_buff, deferring packet.\n",
1584 dev->name);
1585 p->stats.rx_dropped++;
1586
1587 break; /* Jump out */
1588 }
1589
1590 /* Prepare sk_buff to queue for upper layers */
1591
1592 skb->dev = dev;
1593 skb_reserve(skb,2); /* Align IP header on 16 byte boundary */
1594
1595 /*
1596 * Copy data out of our receive descriptor into sk_buff.
1597 *
1598 * (rmdp->u.buffer & 0x00ffffff) -> get address of buffer and
1599 * ignore status fields)
1600 */
1601
1602 memcpy(skb_put(skb,len), (unsigned char *) (rmdp->u.buffer & 0x00ffffff),
1603 len);
1604
1605
1606 /*
1607 * Notify the upper protocol layers that there is another packet
1608 * to handle
1609 *
1610 * netif_rx() always succeeds. see /net/inet/dev.c for more.
1611 */
1612
1613 skb->protocol=eth_type_trans(skb,dev);
1614 netif_rx(skb); /* queue packet and mark it for processing */
1615
1616 /*
1617 * Packet is queued and marked for processing so we
1618 * free our descriptor and update statistics
1619 */
1620
1621 rmdp->u.s.status = RX_OWN;
1622 p->stats.rx_packets++;
1623
1624
1625 p->rmdnum++;
1626 p->rmdnum %= RMDNUM;
1627
1628 rmdp = p->rmdhead + p->rmdnum;
1629 }
1630 }
1631 } /* End of SK_rxintr() */
1632
1633
1634 /*-
1635 * Function : SK_close
1636 * Author : Patrick J.D. Weichmann
1637 * Date Created : 94/05/26
1638 *
1639 * Description : close gets called from dev_close() and should
1640 * deinstall the card (free_irq, mem etc).
1641 *
1642 * Parameters : I : struct device *dev - our device structure
1643 * Return Value : 0 - closed device driver
1644 * Errors : None
1645 * Globals : None
1646 * Update History :
1647 * YY/MM/DD uid Description
1648 -*/
1649
1650 /* I have tried to set BOOT_ROM on and RAM off but then, after a 'ifconfig
1651 * down' the system stops. So I don't shut set card to init state.
1652 */
1653
1654 static int SK_close(struct device *dev)
/* */
1655 {
1656
1657 PRINTK(("## %s: SK_close(). CSR0: %#06x\n",
1658 SK_NAME, SK_read_reg(CSR0)));
1659
1660 dev->tbusy = 1; /* Transmitter busy */
1661 dev->start = 0; /* Card down */
1662
1663 printk("%s: Shutting %s down CSR0 %#06x\n", dev->name, SK_NAME,
1664 (int) SK_read_reg(CSR0));
1665
1666 SK_write_reg(CSR0, CSR0_STOP); /* STOP the LANCE */
1667
1668 free_irq(dev->irq); /* Free IRQ */
1669 irq2dev_map[dev->irq] = 0; /* Mark IRQ as unused */
1670
1671 return 0; /* always succeed */
1672
1673 } /* End of SK_close() */
1674
1675
1676 /*-
1677 * Function : SK_get_stats
1678 * Author : Patrick J.D. Weichmann
1679 * Date Created : 94/05/26
1680 *
1681 * Description : Return current status structure to upper layers.
1682 * It is called by sprintf_stats (dev.c).
1683 *
1684 * Parameters : I : struct device *dev - our device structure
1685 * Return Value : struct enet_statistics * - our current statistics
1686 * Errors : None
1687 * Side Effects : None
1688 * Update History :
1689 * YY/MM/DD uid Description
1690 -*/
1691
1692 static struct enet_statistics *SK_get_stats(struct device *dev)
/* */
1693 {
1694
1695 struct priv *p = (struct priv *) dev->priv;
1696
1697 PRINTK(("## %s: SK_get_stats(). CSR0: %#06x\n",
1698 SK_NAME, SK_read_reg(CSR0)));
1699
1700 return &p->stats; /* Return Device status */
1701
1702 } /* End of SK_get_stats() */
1703
1704
1705 /*-
1706 * Function : set_multicast_list
1707 * Author : Patrick J.D. Weichmann
1708 * Date Created : 94/05/26
1709 *
1710 * Description : This function gets called when a program performs
1711 * a SIOCSIFFLAGS call. Ifconfig does this if you call
1712 * 'ifconfig [-]allmulti' which enables or disables the
1713 * Promiscuous mode.
1714 * Promiscuous mode is when the Network card accepts all
1715 * packets, not only the packets which match our MAC
1716 * Address. It is useful for writing a network monitor,
1717 * but it is also a security problem. You have to remember
1718 * that all information on the net is not encrypted.
1719 *
1720 * Parameters : I : struct device *dev - SK_G16 device Structure
1721 * Return Value : None
1722 * Errors : None
1723 * Globals : None
1724 * Update History :
1725 * YY/MM/DD uid Description
1726 * 95/10/18 ACox Noew multicast calling scheme
1727 -*/
1728
1729
1730 /* Set or clear the multicast filter for SK_G16.
1731 */
1732
1733 static void set_multicast_list(struct device *dev)
/* */
1734 {
1735
1736 if (dev->flags&IFF_PROMISC)
1737 {
1738 /* Reinitialize LANCE with MODE_PROM set */
1739 SK_lance_init(dev, MODE_PROM);
1740 }
1741 else if (dev->mc_count==0 && !(dev->flags&IFF_ALLMULTI))
1742 {
1743 /* Reinitialize LANCE without MODE_PROM */
1744 SK_lance_init(dev, MODE_NORMAL);
1745 }
1746 else
1747 {
1748 /* Multicast with logical address filter on */
1749 /* Reinitialize LANCE without MODE_PROM */
1750 SK_lance_init(dev, MODE_NORMAL);
1751
1752 /* Not implemented yet. */
1753 }
1754 } /* End of set_multicast_list() */
1755
1756
1757
1758 /*-
1759 * Function : SK_rom_addr
1760 * Author : Patrick J.D. Weichmann
1761 * Date Created : 94/06/01
1762 *
1763 * Description : Try to find a Boot_ROM at all possible locations
1764 *
1765 * Parameters : None
1766 * Return Value : Address where Boot_ROM is
1767 * Errors : 0 - Did not find Boot_ROM
1768 * Globals : None
1769 * Update History :
1770 * YY/MM/DD uid Description
1771 -*/
1772
1773 unsigned int SK_rom_addr(void)
/* */
1774 {
1775 int i,j;
1776 int rom_found = 0;
1777 unsigned int rom_location[] = SK_BOOT_ROM_LOCATIONS;
1778 unsigned char rom_id[] = SK_BOOT_ROM_ID;
1779 unsigned char *test_byte;
1780
1781 /* Autodetect Boot_ROM */
1782 PRINTK(("## %s: Autodetection of Boot_ROM\n", SK_NAME));
1783
1784 for (i = 0; (rom_location[i] != 0) && (rom_found == 0); i++)
1785 {
1786
1787 PRINTK(("## Trying ROM location %#08x", rom_location[i]));
1788
1789 rom_found = 1;
1790 for (j = 0; j < 6; j++)
1791 {
1792 test_byte = (unsigned char *) (rom_location[i]+j);
1793 PRINTK((" %02x ", *test_byte));
1794
1795 if(!(*test_byte == rom_id[j]))
1796 {
1797 rom_found = 0;
1798 }
1799 }
1800 PRINTK(("\n"));
1801 }
1802
1803 if (rom_found == 1)
1804 {
1805 PRINTK(("## %s: Boot_ROM found at %#08x\n",
1806 SK_NAME, rom_location[(i-1)]));
1807
1808 return (rom_location[--i]);
1809 }
1810 else
1811 {
1812 PRINTK(("%s: No Boot_ROM found\n", SK_NAME));
1813 return 0;
1814 }
1815 } /* End of SK_rom_addr() */
1816
1817
1818
1819 /* LANCE access functions
1820 *
1821 * ! CSR1-3 can only be accessed when in CSR0 the STOP bit is set !
1822 */
1823
1824
1825 /*-
1826 * Function : SK_reset_board
1827 *
1828 * Author : Patrick J.D. Weichmann
1829 *
1830 * Date Created : 94/05/25
1831 *
1832 * Description : This function resets SK_G16 and all components, but
1833 * POS registers are not changed
1834 *
1835 * Parameters : None
1836 * Return Value : None
1837 * Errors : None
1838 * Globals : SK_RAM *board - SK_RAM structure pointer
1839 *
1840 * Update History :
1841 * YY/MM/DD uid Description
1842 -*/
1843
1844 void SK_reset_board(void)
/* */
1845 {
1846 int i;
1847
1848 SK_PORT = 0x00; /* Reset active */
1849 for (i = 0; i < 10 ; i++) /* Delay min 5ms */
1850 ;
1851 SK_PORT = SK_RESET; /* Set back to normal operation */
1852
1853 } /* End of SK_reset_board() */
1854
1855
1856 /*-
1857 * Function : SK_set_RAP
1858 * Author : Patrick J.D. Weichmann
1859 * Date Created : 94/05/25
1860 *
1861 * Description : Set LANCE Register Address Port to register
1862 * for later data transfer.
1863 *
1864 * Parameters : I : reg_number - which CSR to read/write from/to
1865 * Return Value : None
1866 * Errors : None
1867 * Globals : SK_RAM *board - SK_RAM structure pointer
1868 * Update History :
1869 * YY/MM/DD uid Description
1870 -*/
1871
1872 void SK_set_RAP(int reg_number)
/* */
1873 {
1874 SK_IOREG = reg_number;
1875 SK_PORT = SK_RESET | SK_RAP | SK_WREG;
1876 SK_IOCOM = SK_DOIO;
1877
1878 while (SK_PORT & SK_IORUN)
1879 ;
1880 } /* End of SK_set_RAP() */
1881
1882
1883 /*-
1884 * Function : SK_read_reg
1885 * Author : Patrick J.D. Weichmann
1886 * Date Created : 94/05/25
1887 *
1888 * Description : Set RAP and read data from a LANCE CSR register
1889 *
1890 * Parameters : I : reg_number - which CSR to read from
1891 * Return Value : Register contents
1892 * Errors : None
1893 * Globals : SK_RAM *board - SK_RAM structure pointer
1894 * Update History :
1895 * YY/MM/DD uid Description
1896 -*/
1897
1898 int SK_read_reg(int reg_number)
/* */
1899 {
1900 SK_set_RAP(reg_number);
1901
1902 SK_PORT = SK_RESET | SK_RDATA | SK_RREG;
1903 SK_IOCOM = SK_DOIO;
1904
1905 while (SK_PORT & SK_IORUN)
1906 ;
1907 return (SK_IOREG);
1908
1909 } /* End of SK_read_reg() */
1910
1911
1912 /*-
1913 * Function : SK_rread_reg
1914 * Author : Patrick J.D. Weichmann
1915 * Date Created : 94/05/28
1916 *
1917 * Description : Read data from preseted register.
1918 * This function requires that you know which
1919 * Register is actually set. Be aware that CSR1-3
1920 * can only be accessed when in CSR0 STOP is set.
1921 *
1922 * Return Value : Register contents
1923 * Errors : None
1924 * Globals : SK_RAM *board - SK_RAM structure pointer
1925 * Update History :
1926 * YY/MM/DD uid Description
1927 -*/
1928
1929 int SK_rread_reg(void)
/* */
1930 {
1931 SK_PORT = SK_RESET | SK_RDATA | SK_RREG;
1932
1933 SK_IOCOM = SK_DOIO;
1934
1935 while (SK_PORT & SK_IORUN)
1936 ;
1937 return (SK_IOREG);
1938
1939 } /* End of SK_rread_reg() */
1940
1941
1942 /*-
1943 * Function : SK_write_reg
1944 * Author : Patrick J.D. Weichmann
1945 * Date Created : 94/05/25
1946 *
1947 * Description : This function sets the RAP then fills in the
1948 * LANCE I/O Reg and starts Transfer to LANCE.
1949 * It waits until transfer has ended which is max. 7 ms
1950 * and then it returns.
1951 *
1952 * Parameters : I : reg_number - which CSR to write to
1953 * I : value - what value to fill into register
1954 * Return Value : None
1955 * Errors : None
1956 * Globals : SK_RAM *board - SK_RAM structure pointer
1957 * Update History :
1958 * YY/MM/DD uid Description
1959 -*/
1960
1961 void SK_write_reg(int reg_number, int value)
/* */
1962 {
1963 SK_set_RAP(reg_number);
1964
1965 SK_IOREG = value;
1966 SK_PORT = SK_RESET | SK_RDATA | SK_WREG;
1967 SK_IOCOM = SK_DOIO;
1968
1969 while (SK_PORT & SK_IORUN)
1970 ;
1971 } /* End of SK_write_reg */
1972
1973
1974
1975 /*
1976 * Debugging functions
1977 * -------------------
1978 */
1979
1980 /*-
1981 * Function : SK_print_pos
1982 * Author : Patrick J.D. Weichmann
1983 * Date Created : 94/05/25
1984 *
1985 * Description : This function prints out the 4 POS (Programmable
1986 * Option Select) Registers. Used mainly to debug operation.
1987 *
1988 * Parameters : I : struct device *dev - SK_G16 device structure
1989 * I : char * - Text which will be printed as title
1990 * Return Value : None
1991 * Errors : None
1992 * Update History :
1993 * YY/MM/DD uid Description
1994 -*/
1995
1996 void SK_print_pos(struct device *dev, char *text)
/* */
1997 {
1998 int ioaddr = dev->base_addr;
1999
2000 unsigned char pos0 = inb(SK_POS0),
2001 pos1 = inb(SK_POS1),
2002 pos2 = inb(SK_POS2),
2003 pos3 = inb(SK_POS3),
2004 pos4 = inb(SK_POS4);
2005
2006
2007 printk("## %s: %s.\n"
2008 "## pos0=%#4x pos1=%#4x pos2=%#04x pos3=%#08x pos4=%#04x\n",
2009 SK_NAME, text, pos0, pos1, pos2, (pos3<<14), pos4);
2010
2011 } /* End of SK_print_pos() */
2012
2013
2014
2015 /*-
2016 * Function : SK_print_dev
2017 * Author : Patrick J.D. Weichmann
2018 * Date Created : 94/05/25
2019 *
2020 * Description : This function simply prints out the important fields
2021 * of the device structure.
2022 *
2023 * Parameters : I : struct device *dev - SK_G16 device structure
2024 * I : char *text - Title for printing
2025 * Return Value : None
2026 * Errors : None
2027 * Update History :
2028 * YY/MM/DD uid Description
2029 -*/
2030
2031 void SK_print_dev(struct device *dev, char *text)
/* */
2032 {
2033 if (dev == NULL)
2034 {
2035 printk("## %s: Device Structure. %s\n", SK_NAME, text);
2036 printk("## DEVICE == NULL\n");
2037 }
2038 else
2039 {
2040 printk("## %s: Device Structure. %s\n", SK_NAME, text);
2041 printk("## Device Name: %s Base Address: %#06lx IRQ: %d\n",
2042 dev->name, dev->base_addr, dev->irq);
2043
2044 printk("## FLAGS: start: %d tbusy: %ld int: %d\n",
2045 dev->start, dev->tbusy, dev->interrupt);
2046
2047 printk("## next device: %#08x init function: %#08x\n",
2048 (int) dev->next, (int) dev->init);
2049 }
2050
2051 } /* End of SK_print_dev() */
2052
2053
2054
2055 /*-
2056 * Function : SK_print_ram
2057 * Author : Patrick J.D. Weichmann
2058 * Date Created : 94/06/02
2059 *
2060 * Description : This function is used to check how are things set up
2061 * in the 16KB RAM. Also the pointers to the receive and
2062 * transmit descriptor rings and rx and tx buffers locations.
2063 * It contains a minor bug in printing, but has no effect to the values
2064 * only newlines are not correct.
2065 *
2066 * Parameters : I : struct device *dev - SK_G16 device structure
2067 * Return Value : None
2068 * Errors : None
2069 * Globals : None
2070 * Update History :
2071 * YY/MM/DD uid Description
2072 -*/
2073
2074 void SK_print_ram(struct device *dev)
/* ![[last]](../icons/n_last.png)
*/
2075 {
2076
2077 int i;
2078 struct priv *p = (struct priv *) dev->priv;
2079
2080 printk("## %s: RAM Details.\n"
2081 "## RAM at %#08x tmdhead: %#08x rmdhead: %#08x initblock: %#08x\n",
2082 SK_NAME,
2083 (unsigned int) p->ram,
2084 (unsigned int) p->tmdhead,
2085 (unsigned int) p->rmdhead,
2086 (unsigned int) &(p->ram)->ib);
2087
2088 printk("## ");
2089
2090 for(i = 0; i < TMDNUM; i++)
2091 {
2092 if (!(i % 3)) /* Every third line do a newline */
2093 {
2094 printk("\n## ");
2095 }
2096 printk("tmdbufs%d: %#08x ", (i+1), (int) p->tmdbufs[i]);
2097 }
2098 printk("## ");
2099
2100 for(i = 0; i < RMDNUM; i++)
2101 {
2102 if (!(i % 3)) /* Every third line do a newline */
2103 {
2104 printk("\n## ");
2105 }
2106 printk("rmdbufs%d: %#08x ", (i+1), (int) p->rmdbufs[i]);
2107 }
2108 printk("\n");
2109
2110 } /* End of SK_print_ram() */
2111
![[bottom]](../icons/n_bottom.png){kind=icon}
*/