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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 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];
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 #ifdef HAVE_MULTICAST
500 static void set_multicast_list(struct device *dev, int num_addrs, void *addrs);
501 #endif
502
503 /*
504 * LANCE Functions
505 * ---------------
506 */
507
508 static int SK_lance_init(struct device *dev, unsigned short mode);
509 void SK_reset_board(void);
510 void SK_set_RAP(int reg_number);
511 int SK_read_reg(int reg_number);
512 int SK_rread_reg(void);
513 void SK_write_reg(int reg_number, int value);
514
515 /*
516 * Debugging functions
517 * -------------------
518 */
519
520 void SK_print_pos(struct device *dev, char *text);
521 void SK_print_dev(struct device *dev, char *text);
522 void SK_print_ram(struct device *dev);
523
524
525 /*-
526 * Function : SK_init
527 * Author : Patrick J.D. Weichmann
528 * Date Created : 94/05/26
529 *
530 * Description : Check for a SK_G16 network adaptor and initialize it.
531 * This function gets called by dev_init which initializes
532 * all Network devices.
533 *
534 * Parameters : I : struct device *dev - structure preconfigured
535 * from Space.c
536 * Return Value : 0 = Driver Found and initialized
537 * Errors : ENODEV - no device found
538 * ENXIO - not probed
539 * Globals : None
540 * Update History :
541 * YY/MM/DD uid Description
542 -*/
543
544 /*
545 * Check for a network adaptor of this type, and return '0' if one exists.
546 * If dev->base_addr == 0, probe all likely locations.
547 * If dev->base_addr == 1, always return failure.
548 * If dev->base_addr == 2, allocate space for the device and return success
549 * (detachable devices only).
550 */
551
552 int SK_init(struct device *dev)
/* ![[next]](../icons/right.png)
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*/
553 {
554 int ioaddr = 0; /* I/O port address used for POS regs */
555 int *port, ports[] = SK_IO_PORTS; /* SK_G16 supported ports */
556
557 /* get preconfigured base_addr from dev which is done in Space.c */
558 int base_addr = dev->base_addr;
559
560 PRINTK(("%s: %s", SK_NAME, rcsid));
561 rcsid = NULL; /* We do not want to use this further */
562
563 if (base_addr > 0x0ff) /* Check a single specified address */
564 {
565 /* Check if on specified address is a SK_G16 */
566
567 if ( (inb(SK_POS0) == SK_IDLOW) ||
568 (inb(SK_POS1) == SK_IDHIGH) )
569 {
570 return SK_probe(dev, base_addr);
571 }
572
573 return ENODEV; /* Sorry, but on specified address NO SK_G16 */
574 }
575 else if (base_addr > 0) /* Don't probe at all */
576 {
577 return ENXIO;
578 }
579
580 /* Autoprobe base_addr */
581
582 for (port = &ports[0]; *port; port++)
583 {
584 ioaddr = *port; /* we need ioaddr for accessing POS regs */
585
586 /* Check if I/O Port region is used by another board */
587
588 if (check_region(ioaddr, ETHERCARD_TOTAL_SIZE))
589 {
590 continue; /* Try next Port address */
591 }
592
593 /* Check if at ioaddr is a SK_G16 */
594
595 if ( !(inb(SK_POS0) == SK_IDLOW) ||
596 !(inb(SK_POS1) == SK_IDHIGH) )
597 {
598 continue; /* Try next Port address */
599 }
600
601 dev->base_addr = ioaddr; /* Set I/O Port Address */
602
603 if (SK_probe(dev, ioaddr) == 0)
604 {
605 return 0; /* Card found and initialized */
606 }
607 }
608
609 dev->base_addr = base_addr; /* Write back original base_addr */
610
611 return ENODEV; /* Failed to find or init driver */
612
613 } /* End of SK_init */
614
615
616 /*-
617 * Function : SK_probe
618 * Author : Patrick J.D. Weichmann
619 * Date Created : 94/05/26
620 *
621 * Description : This function is called by SK_init and
622 * does the main part of initialization.
623 *
624 * Parameters : I : struct device *dev - SK_G16 device structure
625 * I : short ioaddr - I/O Port address where POS is.
626 * Return Value : 0 = Initialization done
627 * Errors : ENODEV - No SK_G16 found
628 * -1 - Configuration problem
629 * Globals : irq2dev_map - Which device uses which IRQ
630 * : board - pointer to SK_RAM
631 * Update History :
632 * YY/MM/DD uid Description
633 * 94/06/30 pwe SK_ADDR now checked and at the correct place
634 -*/
635
636 int SK_probe(struct device *dev, short ioaddr)
/* ![[previous]](../icons/left.png)
*/
637 {
638 int i,j; /* Counters */
639 int sk_addr_flag = 0; /* SK ADDR correct? 1 - no, 0 - yes */
640 unsigned int rom_addr; /* used to store RAM address used for POS_ADDR */
641
642 struct priv *p; /* SK_G16 private structure */
643
644 if (SK_ADDR & 0x3fff || SK_ADDR < 0xa0000)
645 {
646
647 sk_addr_flag = 1;
648
649 /*
650 * Now here we could use a routine which searches for a free
651 * place in the ram and set SK_ADDR if found. TODO.
652 */
653 }
654
655 if (SK_BOOT_ROM) /* Shall we keep Boot_ROM on ? */
656 {
657 PRINTK(("## %s: SK_BOOT_ROM is set.\n", SK_NAME));
658
659 rom_addr = SK_rom_addr();
660
661 if (rom_addr == 0) /* No Boot_ROM found */
662 {
663 if (sk_addr_flag) /* No or Invalid SK_ADDR is defined */
664 {
665 printk("%s: SK_ADDR %#08x is not valid. Check configuration.\n",
666 dev->name, SK_ADDR);
667 return -1;
668 }
669
670 rom_addr = SK_ADDR; /* assign predefined address */
671
672 PRINTK(("## %s: NO Bootrom found \n", SK_NAME));
673
674 outb(SK_ROM_RAM_OFF, SK_POS2); /* Boot_ROM + RAM off */
675 outb(POS_ADDR, SK_POS3); /* Set RAM address */
676 outb(SK_RAM_ON, SK_POS2); /* enable RAM */
677 }
678 else if (rom_addr == SK_ADDR)
679 {
680 printk("%s: RAM + ROM are set to the same address %#08x\n"
681 " Check configuration. Now switching off Boot_ROM\n",
682 SK_NAME, rom_addr);
683
684 outb(SK_ROM_RAM_OFF, SK_POS2); /* Boot_ROM + RAM off*/
685 outb(POS_ADDR, SK_POS3); /* Set RAM address */
686 outb(SK_RAM_ON, SK_POS2); /* enable RAM */
687 }
688 else
689 {
690 PRINTK(("## %s: Found ROM at %#08x\n", SK_NAME, rom_addr));
691 PRINTK(("## %s: Keeping Boot_ROM on\n", SK_NAME));
692
693 if (sk_addr_flag) /* No or Invalid SK_ADDR is defined */
694 {
695 printk("%s: SK_ADDR %#08x is not valid. Check configuration.\n",
696 dev->name, SK_ADDR);
697 return -1;
698 }
699
700 rom_addr = SK_ADDR;
701
702 outb(SK_ROM_RAM_OFF, SK_POS2); /* Boot_ROM + RAM off */
703 outb(POS_ADDR, SK_POS3); /* Set RAM address */
704 outb(SK_ROM_RAM_ON, SK_POS2); /* RAM on, BOOT_ROM on */
705 }
706 }
707 else /* Don't keep Boot_ROM */
708 {
709 PRINTK(("## %s: SK_BOOT_ROM is not set.\n", SK_NAME));
710
711 if (sk_addr_flag) /* No or Invalid SK_ADDR is defined */
712 {
713 printk("%s: SK_ADDR %#08x is not valid. Check configuration.\n",
714 dev->name, SK_ADDR);
715 return -1;
716 }
717
718 rom_addr = SK_rom_addr(); /* Try to find a Boot_ROM */
719
720 /* IF we find a Boot_ROM disable it */
721
722 outb(SK_ROM_RAM_OFF, SK_POS2); /* Boot_ROM + RAM off */
723
724 /* We found a Boot_ROM and it's gone. Set RAM address on
725 * Boot_ROM address.
726 */
727
728 if (rom_addr)
729 {
730 printk("%s: We found Boot_ROM at %#08x. Now setting RAM on"
731 "that address\n", SK_NAME, rom_addr);
732
733 outb(POS_ADDR, SK_POS3); /* Set RAM on Boot_ROM address */
734 }
735 else /* We did not find a Boot_ROM, use predefined SK_ADDR for ram */
736 {
737 if (sk_addr_flag) /* No or Invalid SK_ADDR is defined */
738 {
739 printk("%s: SK_ADDR %#08x is not valid. Check configuration.\n",
740 dev->name, SK_ADDR);
741 return -1;
742 }
743
744 rom_addr = SK_ADDR;
745
746 outb(POS_ADDR, SK_POS3); /* Set RAM address */
747 }
748 outb(SK_RAM_ON, SK_POS2); /* enable RAM */
749 }
750
751 #ifdef SK_DEBUG
752 SK_print_pos(dev, "POS registers after ROM, RAM config");
753 #endif
754
755 board = (SK_RAM *) rom_addr;
756
757 /* Read in station address */
758 for (i = 0, j = 0; i < ETH_ALEN; i++, j+=2)
759 {
760 dev->dev_addr[i] = board->rom[j];
761 }
762
763 /* Check for manufacturer code */
764 if (!(dev->dev_addr[0] == SK_MAC0 &&
765 dev->dev_addr[1] == SK_MAC1 &&
766 dev->dev_addr[2] == SK_MAC2) )
767 {
768 PRINTK(("## %s: We did not find SK_G16 at RAM location.\n",
769 SK_NAME));
770 return ENODEV; /* NO SK_G16 found */
771 }
772
773 printk("%s: %s found at %#3x, HW addr: %#04x:%02x:%02x:%02x:%02x:%02x\n",
774 dev->name,
775 "Schneider & Koch Netcard",
776 (unsigned int) dev->base_addr,
777 dev->dev_addr[0],
778 dev->dev_addr[1],
779 dev->dev_addr[2],
780 dev->dev_addr[3],
781 dev->dev_addr[4],
782 dev->dev_addr[5]);
783
784 /* Grab the I/O Port region */
785 request_region(ioaddr, ETHERCARD_TOTAL_SIZE,"sk_g16");
786
787 /* Initialize device structure */
788
789 /* Allocate memory for private structure */
790 p = dev->priv = (void *) kmalloc(sizeof(struct priv), GFP_KERNEL);
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
800 #ifdef HAVE_MULTICAST
801 dev->set_multicast_list = &set_multicast_list;
802 #endif
803
804
805 /* Set the generic fields of the device structure */
806
807 ether_setup(dev);
808
809 /* Initialize private structure */
810
811 p->ram = (struct SK_ram *) rom_addr; /* Set dual ported RAM addr */
812 p->tmdhead = &(p->ram)->tmde[0]; /* Set TMD head */
813 p->rmdhead = &(p->ram)->rmde[0]; /* Set RMD head */
814
815 /* Initialize buffer pointers */
816
817 for (i = 0; i < TMDNUM; i++)
818 {
819 p->tmdbufs[i] = &(p->ram)->tmdbuf[i];
820 }
821
822 for (i = 0; i < RMDNUM; i++)
823 {
824 p->rmdbufs[i] = &(p->ram)->rmdbuf[i];
825 }
826
827 #ifdef SK_DEBUG
828 SK_print_pos(dev, "End of SK_probe");
829 SK_print_ram(dev);
830 #endif
831
832 return 0; /* Initialization done */
833
834 } /* End of SK_probe() */
835
836
837 /*-
838 * Function : SK_open
839 * Author : Patrick J.D. Weichmann
840 * Date Created : 94/05/26
841 *
842 * Description : This function is called sometimes after booting
843 * when ifconfig program is run.
844 *
845 * This function requests an IRQ, sets the correct
846 * IRQ in the card. Then calls SK_lance_init() to
847 * init and start the LANCE chip. Then if everything is
848 * ok returns with 0 (OK), which means SK_G16 is now
849 * opened and operational.
850 *
851 * (Called by dev_open() /net/inet/dev.c)
852 *
853 * Parameters : I : struct device *dev - SK_G16 device structure
854 * Return Value : 0 - Device opened
855 * Errors : -EAGAIN - Open failed
856 * Globals : irq2dev_map - which device uses which irq
857 * Side Effects : None
858 * Update History :
859 * YY/MM/DD uid Description
860 -*/
861
862 static int SK_open(struct device *dev)
/* */
863 {
864 int i = 0;
865 int irqval = 0;
866 int ioaddr = dev->base_addr;
867
868 int irqtab[] = SK_IRQS;
869
870 struct priv *p = (struct priv *)dev->priv;
871
872 PRINTK(("## %s: At beginning of SK_open(). CSR0: %#06x\n",
873 SK_NAME, SK_read_reg(CSR0)));
874
875 if (dev->irq == 0) /* Autoirq */
876 {
877 i = 0;
878
879 /*
880 * Check if one IRQ out of SK_IRQS is free and install
881 * interrupt handler.
882 * Most done by request_irq().
883 * irqval: 0 - interrupt handler installed for IRQ irqtab[i]
884 * -EBUSY - interrupt busy
885 * -EINVAL - irq > 15 or handler = NULL
886 */
887
888 do
889 {
890 irqval = request_irq(irqtab[i], &SK_interrupt, 0, "sk_g16");
891 i++;
892 } while (irqval && irqtab[i]);
893
894 if (irqval) /* We tried every possible IRQ but no success */
895 {
896 printk("%s: unable to get an IRQ\n", dev->name);
897 return -EAGAIN;
898 }
899
900 dev->irq = irqtab[--i];
901
902 outb(i<<2, SK_POS4); /* Set Card on probed IRQ */
903
904 }
905 else if (dev->irq == 2) /* IRQ2 is always IRQ9 */
906 {
907 if (request_irq(9, &SK_interrupt, 0, "sk_g16"))
908 {
909 printk("%s: unable to get IRQ 9\n", dev->name);
910 return -EAGAIN;
911 }
912 dev->irq = 9;
913
914 /*
915 * Now we set card on IRQ2.
916 * This can be confusing, but remember that IRQ2 on the network
917 * card is in reality IRQ9
918 */
919 outb(0x08, SK_POS4); /* set card to IRQ2 */
920
921 }
922 else /* Check IRQ as defined in Space.c */
923 {
924 int i = 0;
925
926 /* check if IRQ free and valid. Then install Interrupt handler */
927
928 if (request_irq(dev->irq, &SK_interrupt, 0, "sk_g16"))
929 {
930 printk("%s: unable to get selected IRQ\n", dev->name);
931 return -EAGAIN;
932 }
933
934 switch(dev->irq)
935 {
936 case 3: i = 0;
937 break;
938 case 5: i = 1;
939 break;
940 case 2: i = 2;
941 break;
942 case 11:i = 3;
943 break;
944 default:
945 printk("%s: Preselected IRQ %d is invalid for %s boards",
946 dev->name,
947 dev->irq,
948 SK_NAME);
949 return -EAGAIN;
950 }
951
952 outb(i<<2, SK_POS4); /* Set IRQ on card */
953 }
954
955 irq2dev_map[dev->irq] = dev; /* Set IRQ as used by us */
956
957 printk("%s: Schneider & Koch G16 at %#3x, IRQ %d, shared mem at %#08x\n",
958 dev->name, (unsigned int)dev->base_addr,
959 (int) dev->irq, (unsigned int) p->ram);
960
961 if (!(i = SK_lance_init(dev, 0))) /* LANCE init OK? */
962 {
963
964
965 dev->tbusy = 0;
966 dev->interrupt = 0;
967 dev->start = 1;
968
969 #ifdef SK_DEBUG
970
971 /*
972 * This debug block tries to stop LANCE,
973 * reinit LANCE with transmitter and receiver disabled,
974 * then stop again and reinit with NORMAL_MODE
975 */
976
977 printk("## %s: After lance init. CSR0: %#06x\n",
978 SK_NAME, SK_read_reg(CSR0));
979 SK_write_reg(CSR0, CSR0_STOP);
980 printk("## %s: LANCE stopped. CSR0: %#06x\n",
981 SK_NAME, SK_read_reg(CSR0));
982 SK_lance_init(dev, MODE_DTX | MODE_DRX);
983 printk("## %s: Reinit with DTX + DRX off. CSR0: %#06x\n",
984 SK_NAME, SK_read_reg(CSR0));
985 SK_write_reg(CSR0, CSR0_STOP);
986 printk("## %s: LANCE stopped. CSR0: %#06x\n",
987 SK_NAME, SK_read_reg(CSR0));
988 SK_lance_init(dev, MODE_NORMAL);
989 printk("## %s: LANCE back to normal mode. CSR0: %#06x\n",
990 SK_NAME, SK_read_reg(CSR0));
991 SK_print_pos(dev, "POS regs before returning OK");
992
993 #endif /* SK_DEBUG */
994
995 return 0; /* SK_open() is successful */
996 }
997 else /* LANCE init failed */
998 {
999
1000 PRINTK(("## %s: LANCE init failed: CSR0: %#06x\n",
1001 SK_NAME, SK_read_reg(CSR0)));
1002
1003 dev->start = 0; /* Device not ready */
1004 return -EAGAIN;
1005 }
1006
1007 } /* End of SK_open() */
1008
1009
1010 /*-
1011 * Function : SK_lance_init
1012 * Author : Patrick J.D. Weichmann
1013 * Date Created : 94/05/26
1014 *
1015 * Description : Reset LANCE chip, fill RMD, TMD structures with
1016 * start values and Start LANCE.
1017 *
1018 * Parameters : I : struct device *dev - SK_G16 device structure
1019 * I : int mode - put LANCE into "mode" see data-sheet for
1020 * more info.
1021 * Return Value : 0 - Init done
1022 * Errors : -1 - Init failed
1023 * Update History :
1024 * YY/MM/DD uid Description
1025 -*/
1026
1027 static int SK_lance_init(struct device *dev, unsigned short mode)
/* */
1028 {
1029 int i;
1030 struct priv *p = (struct priv *) dev->priv;
1031 struct tmd *tmdp;
1032 struct rmd *rmdp;
1033
1034 PRINTK(("## %s: At beginning of LANCE init. CSR0: %#06x\n",
1035 SK_NAME, SK_read_reg(CSR0)));
1036
1037 /* Reset LANCE */
1038 SK_reset_board();
1039
1040 /* Initialize TMD's with start values */
1041 p->tmdnum = 0; /* First descriptor for transmitting */
1042 p->tmdlast = 0; /* First descriptor for reading stats */
1043
1044 for (i = 0; i < TMDNUM; i++) /* Init all TMD's */
1045 {
1046 tmdp = p->tmdhead + i;
1047
1048 tmdp->u.buffer = (unsigned long) p->tmdbufs[i]; /* assign buffer */
1049
1050 /* Mark TMD as start and end of packet */
1051 tmdp->u.s.status = TX_STP | TX_ENP;
1052 }
1053
1054
1055 /* Initialize RMD's with start values */
1056
1057 p->rmdnum = 0; /* First RMD which will be used */
1058
1059 for (i = 0; i < RMDNUM; i++) /* Init all RMD's */
1060 {
1061 rmdp = p->rmdhead + i;
1062
1063
1064 rmdp->u.buffer = (unsigned long) p->rmdbufs[i]; /* assign buffer */
1065
1066 /*
1067 * LANCE must be owner at beginning so that he can fill in
1068 * receiving packets, set status and release RMD
1069 */
1070
1071 rmdp->u.s.status = RX_OWN;
1072
1073 rmdp->blen = -PKT_BUF_SZ; /* Buffer Size in a two's complement */
1074
1075 rmdp->mlen = 0; /* init message length */
1076
1077 }
1078
1079 /* Fill LANCE Initialize Block */
1080
1081 (p->ram)->ib.mode = mode; /* Set operation mode */
1082
1083 for (i = 0; i < ETH_ALEN; i++) /* Set physical address */
1084 {
1085 (p->ram)->ib.paddr[i] = dev->dev_addr[i];
1086 }
1087
1088 for (i = 0; i < 8; i++) /* Set multicast, logical address */
1089 {
1090 (p->ram)->ib.laddr[i] = 0; /* We do not use logical addressing */
1091 }
1092
1093 /* Set ring descriptor pointers and set number of descriptors */
1094
1095 (p->ram)->ib.rdrp = (int) p->rmdhead | RMDNUMMASK;
1096 (p->ram)->ib.tdrp = (int) p->tmdhead | TMDNUMMASK;
1097
1098 /* Prepare LANCE Control and Status Registers */
1099
1100 cli();
1101
1102 SK_write_reg(CSR3, CSR3_ACON); /* Ale Control !!!THIS MUST BE SET!!!! */
1103
1104 /*
1105 * LANCE addresses the RAM from 0x0000 to 0x3fbf and has no access to
1106 * PC Memory locations.
1107 *
1108 * In structure SK_ram is defined that the first thing in ram
1109 * is the initialization block. So his address is for LANCE always
1110 * 0x0000
1111 *
1112 * CSR1 contains low order bits 15:0 of initialization block address
1113 * CSR2 is built of:
1114 * 7:0 High order bits 23:16 of initialization block address
1115 * 15:8 reserved, must be 0
1116 */
1117
1118 /* Set initialization block address (must be on word boundary) */
1119 SK_write_reg(CSR1, 0); /* Set low order bits 15:0 */
1120 SK_write_reg(CSR2, 0); /* Set high order bits 23:16 */
1121
1122
1123 PRINTK(("## %s: After setting CSR1-3. CSR0: %#06x\n",
1124 SK_NAME, SK_read_reg(CSR0)));
1125
1126 /* Initialize LANCE */
1127
1128 /*
1129 * INIT = Initialize, when set, causes the LANCE to begin the
1130 * initialization procedure and access the Init Block.
1131 */
1132
1133 SK_write_reg(CSR0, CSR0_INIT);
1134
1135 sti();
1136
1137 /* Wait until LANCE finished initialization */
1138
1139 SK_set_RAP(CSR0); /* Register Address Pointer to CSR0 */
1140
1141 for (i = 0; (i < 100) && !(SK_rread_reg() & CSR0_IDON); i++)
1142 ; /* Wait until init done or go ahead if problems (i>=100) */
1143
1144 if (i >= 100) /* Something is wrong ! */
1145 {
1146 printk("%s: can't init am7990, status: %04x "
1147 "init_block: %#08x\n",
1148 dev->name, (int) SK_read_reg(CSR0),
1149 (unsigned int) &(p->ram)->ib);
1150
1151 #ifdef SK_DEBUG
1152 SK_print_pos(dev, "LANCE INIT failed");
1153 SK_print_dev(dev,"Device Structure:");
1154 #endif
1155
1156 return -1; /* LANCE init failed */
1157 }
1158
1159 PRINTK(("## %s: init done after %d ticks\n", SK_NAME, i));
1160
1161 /* Clear Initialize done, enable Interrupts, start LANCE */
1162
1163 SK_write_reg(CSR0, CSR0_IDON | CSR0_INEA | CSR0_STRT);
1164
1165 PRINTK(("## %s: LANCE started. CSR0: %#06x\n", SK_NAME,
1166 SK_read_reg(CSR0)));
1167
1168 return 0; /* LANCE is up and running */
1169
1170 } /* End of SK_lance_init() */
1171
1172
1173
1174 /*-
1175 * Function : SK_send_packet
1176 * Author : Patrick J.D. Weichmann
1177 * Date Created : 94/05/27
1178 *
1179 * Description : Writes an socket buffer into a transmit descriptor
1180 * and starts transmission.
1181 *
1182 * Parameters : I : struct sk_buff *skb - packet to transfer
1183 * I : struct device *dev - SK_G16 device structure
1184 * Return Value : 0 - OK
1185 * 1 - Could not transmit (dev_queue_xmit will queue it)
1186 * and try to sent it later
1187 * Globals : None
1188 * Side Effects : None
1189 * Update History :
1190 * YY/MM/DD uid Description
1191 -*/
1192
1193 static int SK_send_packet(struct sk_buff *skb, struct device *dev)
/* */
1194 {
1195 struct priv *p = (struct priv *) dev->priv;
1196 struct tmd *tmdp;
1197
1198 if (dev->tbusy)
1199 {
1200 /* if Transmitter more than 150ms busy -> time_out */
1201
1202 int tickssofar = jiffies - dev->trans_start;
1203 if (tickssofar < 15)
1204 {
1205 return 1; /* We have to try transmit later */
1206 }
1207
1208 printk("%s: xmitter timed out, try to restart!\n", dev->name);
1209
1210 SK_lance_init(dev, MODE_NORMAL); /* Reinit LANCE */
1211
1212 dev->tbusy = 0; /* Clear Transmitter flag */
1213
1214 dev->trans_start = jiffies; /* Mark Start of transmission */
1215
1216 }
1217
1218 /*
1219 * If some upper Layer thinks we missed a transmit done interrupt
1220 * we are passed NULL.
1221 * (dev_queue_xmit net/inet/dev.c
1222 */
1223
1224 if (skb == NULL)
1225 {
1226 /*
1227 * Dequeue packets from transmit queue and send them.
1228 */
1229 dev_tint(dev);
1230
1231 return 0;
1232 }
1233
1234 PRINTK2(("## %s: SK_send_packet() called, CSR0 %#04x.\n",
1235 SK_NAME, SK_read_reg(CSR0)));
1236
1237
1238 /*
1239 * Block a timer-based transmit from overlapping.
1240 * This means check if we are already in.
1241 */
1242
1243 if (set_bit(0, (void *) &dev->tbusy) != 0) /* dev->tbusy already set ? */
1244 {
1245 printk("%s: Transmitter access conflict.\n", dev->name);
1246 }
1247 else
1248 {
1249 /* Evaluate Packet length */
1250 short len = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
1251
1252 tmdp = p->tmdhead + p->tmdnum; /* Which descriptor for transmitting */
1253
1254 /* Fill in Transmit Message Descriptor */
1255
1256 /* Copy data into dual ported ram */
1257
1258 memcpy((char *) (tmdp->u.buffer & 0x00ffffff), (char *)skb->data,
1259 skb->len);
1260
1261 tmdp->blen = -len; /* set length to transmit */
1262
1263 /*
1264 * Packet start and end is always set because we use the maximum
1265 * packet length as buffer length.
1266 * Relinquish ownership to LANCE
1267 */
1268
1269 tmdp->u.s.status = TX_OWN | TX_STP | TX_ENP;
1270
1271 /* Start Demand Transmission */
1272 SK_write_reg(CSR0, CSR0_TDMD | CSR0_INEA);
1273
1274 dev->trans_start = jiffies; /* Mark start of transmission */
1275
1276 /* Set pointer to next transmit buffer */
1277 p->tmdnum++;
1278 p->tmdnum &= TMDNUM-1;
1279
1280 /* Do we own the next transmit buffer ? */
1281 if (! ((p->tmdhead + p->tmdnum)->u.s.status & TX_OWN) )
1282 {
1283 /*
1284 * We own next buffer and are ready to transmit, so
1285 * clear busy flag
1286 */
1287 dev->tbusy = 0;
1288 }
1289 }
1290 dev_kfree_skb(skb, FREE_WRITE);
1291 return 0;
1292 } /* End of SK_send_packet */
1293
1294
1295 /*-
1296 * Function : SK_interrupt
1297 * Author : Patrick J.D. Weichmann
1298 * Date Created : 94/05/27
1299 *
1300 * Description : SK_G16 interrupt handler which checks for LANCE
1301 * Errors, handles transmit and receive interrupts
1302 *
1303 * Parameters : I : int irq, struct pt_regs * regs -
1304 * Return Value : None
1305 * Errors : None
1306 * Globals : None
1307 * Side Effects : None
1308 * Update History :
1309 * YY/MM/DD uid Description
1310 -*/
1311
1312 static void SK_interrupt(int irq, struct pt_regs * regs)
/* */
1313 {
1314 int csr0;
1315 struct device *dev = (struct device *) irq2dev_map[irq];
1316 struct priv *p = (struct priv *) dev->priv;
1317
1318
1319 PRINTK2(("## %s: SK_interrupt(). status: %#06x\n",
1320 SK_NAME, SK_read_reg(CSR0)));
1321
1322 if (dev == NULL)
1323 {
1324 printk("SK_interrupt(): IRQ %d for unknown device.\n", irq);
1325 }
1326
1327
1328 if (dev->interrupt)
1329 {
1330 printk("%s: Re-entering the interrupt handler.\n", dev->name);
1331 }
1332
1333 csr0 = SK_read_reg(CSR0); /* store register for checking */
1334
1335 dev->interrupt = 1; /* We are handling an interrupt */
1336
1337 /*
1338 * Acknowledge all of the current interrupt sources, disable
1339 * Interrupts (INEA = 0)
1340 */
1341
1342 SK_write_reg(CSR0, csr0 & CSR0_CLRALL);
1343
1344 if (csr0 & CSR0_ERR) /* LANCE Error */
1345 {
1346 printk("%s: error: %04x\n", dev->name, csr0);
1347
1348 if (csr0 & CSR0_MISS) /* No place to store packet ? */
1349 {
1350 p->stats.rx_dropped++;
1351 }
1352 }
1353
1354 if (csr0 & CSR0_RINT) /* Receive Interrupt (packet arrived) */
1355 {
1356 SK_rxintr(dev);
1357 }
1358
1359 if (csr0 & CSR0_TINT) /* Transmit interrupt (packet sent) */
1360 {
1361 SK_txintr(dev);
1362 }
1363
1364 SK_write_reg(CSR0, CSR0_INEA); /* Enable Interrupts */
1365
1366 dev->interrupt = 0; /* We are out */
1367 } /* End of SK_interrupt() */
1368
1369
1370 /*-
1371 * Function : SK_txintr
1372 * Author : Patrick J.D. Weichmann
1373 * Date Created : 94/05/27
1374 *
1375 * Description : After sending a packet we check status, update
1376 * statistics and relinquish ownership of transmit
1377 * descriptor ring.
1378 *
1379 * Parameters : I : struct device *dev - SK_G16 device structure
1380 * Return Value : None
1381 * Errors : None
1382 * Globals : None
1383 * Update History :
1384 * YY/MM/DD uid Description
1385 -*/
1386
1387 static void SK_txintr(struct device *dev)
/* */
1388 {
1389 int tmdstat;
1390 struct tmd *tmdp;
1391 struct priv *p = (struct priv *) dev->priv;
1392
1393
1394 PRINTK2(("## %s: SK_txintr() status: %#06x\n",
1395 SK_NAME, SK_read_reg(CSR0)));
1396
1397 tmdp = p->tmdhead + p->tmdlast; /* Which buffer we sent at last ? */
1398
1399 /* Set next buffer */
1400 p->tmdlast++;
1401 p->tmdlast &= TMDNUM-1;
1402
1403 tmdstat = tmdp->u.s.status & 0xff00; /* filter out status bits 15:08 */
1404
1405 /*
1406 * We check status of transmitted packet.
1407 * see LANCE data-sheet for error explanation
1408 */
1409 if (tmdstat & TX_ERR) /* Error occurred */
1410 {
1411 printk("%s: TX error: %04x %04x\n", dev->name, (int) tmdstat,
1412 (int) tmdp->status2);
1413
1414 if (tmdp->status2 & TX_TDR) /* TDR problems? */
1415 {
1416 printk("%s: tdr-problems \n", dev->name);
1417 }
1418
1419 if (tmdp->status2 & TX_RTRY) /* Failed in 16 attempts to transmit ? */
1420 p->stats.tx_aborted_errors++;
1421 if (tmdp->status2 & TX_LCOL) /* Late collision ? */
1422 p->stats.tx_window_errors++;
1423 if (tmdp->status2 & TX_LCAR) /* Loss of Carrier ? */
1424 p->stats.tx_carrier_errors++;
1425 if (tmdp->status2 & TX_UFLO) /* Underflow error ? */
1426 {
1427 p->stats.tx_fifo_errors++;
1428
1429 /*
1430 * If UFLO error occurs it will turn transmitter of.
1431 * So we must reinit LANCE
1432 */
1433
1434 SK_lance_init(dev, MODE_NORMAL);
1435 }
1436
1437 p->stats.tx_errors++;
1438
1439 tmdp->status2 = 0; /* Clear error flags */
1440 }
1441 else if (tmdstat & TX_MORE) /* Collisions occurred ? */
1442 {
1443 /*
1444 * Here I have a problem.
1445 * I only know that there must be one or up to 15 collisions.
1446 * Thats why TX_MORE is set, because after 16 attempts TX_RTRY
1447 * will be set which means couldn't send packet aborted transfer.
1448 *
1449 * First I did not have this in but then I thought at minimum
1450 * we see that something was not ok.
1451 * If anyone knows something better than this to handle this
1452 * please report it. (see Email addresses in the README file)
1453 */
1454
1455 p->stats.collisions++;
1456 }
1457 else /* Packet sent without any problems */
1458 {
1459 p->stats.tx_packets++;
1460 }
1461
1462 /*
1463 * We mark transmitter not busy anymore, because now we have a free
1464 * transmit descriptor which can be filled by SK_send_packet and
1465 * afterwards sent by the LANCE
1466 */
1467
1468 dev->tbusy = 0;
1469
1470 /*
1471 * mark_bh(NET_BH);
1472 * This will cause net_bh() to run after this interrupt handler.
1473 *
1474 * The function which do handle slow IRQ parts is do_bottom_half()
1475 * which runs at normal kernel priority, that means all interrupt are
1476 * enabled. (see kernel/irq.c)
1477 *
1478 * net_bh does something like this:
1479 * - check if already in net_bh
1480 * - try to transmit something from the send queue
1481 * - if something is in the receive queue send it up to higher
1482 * levels if it is a known protocol
1483 * - try to transmit something from the send queue
1484 */
1485
1486 mark_bh(NET_BH);
1487
1488 } /* End of SK_txintr() */
1489
1490
1491 /*-
1492 * Function : SK_rxintr
1493 * Author : Patrick J.D. Weichmann
1494 * Date Created : 94/05/27
1495 *
1496 * Description : Buffer sent, check for errors, relinquish ownership
1497 * of the receive message descriptor.
1498 *
1499 * Parameters : I : SK_G16 device structure
1500 * Return Value : None
1501 * Globals : None
1502 * Update History :
1503 * YY/MM/DD uid Description
1504 -*/
1505
1506 static void SK_rxintr(struct device *dev)
/* */
1507 {
1508
1509 struct rmd *rmdp;
1510 int rmdstat;
1511 struct priv *p = (struct priv *) dev->priv;
1512
1513 PRINTK2(("## %s: SK_rxintr(). CSR0: %#06x\n",
1514 SK_NAME, SK_read_reg(CSR0)));
1515
1516 rmdp = p->rmdhead + p->rmdnum;
1517
1518 /* As long as we own the next entry, check status and send
1519 * it up to higher layer
1520 */
1521
1522 while (!( (rmdstat = rmdp->u.s.status) & RX_OWN))
1523 {
1524 /*
1525 * Start and end of packet must be set, because we use
1526 * the ethernet maximum packet length (1518) as buffer size.
1527 *
1528 * Because our buffers are at maximum OFLO and BUFF errors are
1529 * not to be concerned (see Data sheet)
1530 */
1531
1532 if (rmdstat & (RX_STP | RX_ENP) != (RX_STP | RX_ENP))
1533 {
1534 /* Start of a frame > 1518 Bytes ? */
1535
1536 if (rmdstat & RX_STP)
1537 {
1538 p->stats.rx_errors++; /* bad packet received */
1539 p->stats.rx_length_errors++; /* packet to long */
1540
1541 printk("%s: packet too long\n", dev->name);
1542 }
1543
1544 /*
1545 * All other packets will be ignored until a new frame with
1546 * start (RX_STP) set follows.
1547 *
1548 * What we do is just give descriptor free for new incoming
1549 * packets.
1550 */
1551
1552 rmdp->u.s.status = RX_OWN; /* Relinquish ownership to LANCE */
1553
1554 }
1555 else if (rmdstat & RX_ERR) /* Receive Error ? */
1556 {
1557 printk("%s: RX error: %04x\n", dev->name, (int) rmdstat);
1558
1559 p->stats.rx_errors++;
1560
1561 if (rmdstat & RX_FRAM) p->stats.rx_frame_errors++;
1562 if (rmdstat & RX_CRC) p->stats.rx_crc_errors++;
1563
1564 rmdp->u.s.status = RX_OWN; /* Relinquish ownership to LANCE */
1565
1566 }
1567 else /* We have a packet which can be queued for the upper layers */
1568 {
1569
1570 int len = (rmdp->mlen & 0x0fff); /* extract message length from receive buffer */
1571 struct sk_buff *skb;
1572
1573 skb = alloc_skb(len, GFP_ATOMIC); /* allocate socket buffer */
1574
1575 if (skb == NULL) /* Could not get mem ? */
1576 {
1577
1578 /*
1579 * Couldn't allocate sk_buffer so we give descriptor back
1580 * to Lance, update statistics and go ahead.
1581 */
1582
1583 rmdp->u.s.status = RX_OWN; /* Relinquish ownership to LANCE */
1584 printk("%s: Couldn't allocate sk_buff, deferring packet.\n",
1585 dev->name);
1586 p->stats.rx_dropped++;
1587
1588 break; /* Jump out */
1589 }
1590
1591 /* Prepare sk_buff to queue for upper layers */
1592
1593 skb->len = len;
1594 skb->dev = dev;
1595
1596 /*
1597 * Copy data out of our receive descriptor into sk_buff.
1598 *
1599 * (rmdp->u.buffer & 0x00ffffff) -> get address of buffer and
1600 * ignore status fields)
1601 */
1602
1603 memcpy(skb->data, (unsigned char *) (rmdp->u.buffer & 0x00ffffff),
1604 len);
1605
1606
1607 /*
1608 * Notify the upper protocol layers that there is another packet
1609 * to handle
1610 *
1611 * netif_rx() always succeeds. see /net/inet/dev.c for more.
1612 */
1613
1614 skb->protocol=eth_type_trans(skb,dev);
1615 netif_rx(skb); /* queue packet and mark it for processing */
1616
1617 /*
1618 * Packet is queued and marked for processing so we
1619 * free our descriptor and update statistics
1620 */
1621
1622 rmdp->u.s.status = RX_OWN;
1623 p->stats.rx_packets++;
1624
1625
1626 p->rmdnum++;
1627 p->rmdnum %= RMDNUM;
1628
1629 rmdp = p->rmdhead + p->rmdnum;
1630 }
1631 }
1632 } /* End of SK_rxintr() */
1633
1634
1635 /*-
1636 * Function : SK_close
1637 * Author : Patrick J.D. Weichmann
1638 * Date Created : 94/05/26
1639 *
1640 * Description : close gets called from dev_close() and should
1641 * deinstall the card (free_irq, mem etc).
1642 *
1643 * Parameters : I : struct device *dev - our device structure
1644 * Return Value : 0 - closed device driver
1645 * Errors : None
1646 * Globals : None
1647 * Update History :
1648 * YY/MM/DD uid Description
1649 -*/
1650
1651 /* I have tried to set BOOT_ROM on and RAM off but then, after a 'ifconfig
1652 * down' the system stops. So I don't shut set card to init state.
1653 */
1654
1655 static int SK_close(struct device *dev)
/* */
1656 {
1657
1658 PRINTK(("## %s: SK_close(). CSR0: %#06x\n",
1659 SK_NAME, SK_read_reg(CSR0)));
1660
1661 dev->tbusy = 1; /* Transmitter busy */
1662 dev->start = 0; /* Card down */
1663
1664 printk("%s: Shutting %s down CSR0 %#06x\n", dev->name, SK_NAME,
1665 (int) SK_read_reg(CSR0));
1666
1667 SK_write_reg(CSR0, CSR0_STOP); /* STOP the LANCE */
1668
1669 free_irq(dev->irq); /* Free IRQ */
1670 irq2dev_map[dev->irq] = 0; /* Mark IRQ as unused */
1671
1672 return 0; /* always succeed */
1673
1674 } /* End of SK_close() */
1675
1676
1677 /*-
1678 * Function : SK_get_stats
1679 * Author : Patrick J.D. Weichmann
1680 * Date Created : 94/05/26
1681 *
1682 * Description : Return current status structure to upper layers.
1683 * It is called by sprintf_stats (dev.c).
1684 *
1685 * Parameters : I : struct device *dev - our device structure
1686 * Return Value : struct enet_statistics * - our current statistics
1687 * Errors : None
1688 * Side Effects : None
1689 * Update History :
1690 * YY/MM/DD uid Description
1691 -*/
1692
1693 static struct enet_statistics *SK_get_stats(struct device *dev)
/* */
1694 {
1695
1696 struct priv *p = (struct priv *) dev->priv;
1697
1698 PRINTK(("## %s: SK_get_stats(). CSR0: %#06x\n",
1699 SK_NAME, SK_read_reg(CSR0)));
1700
1701 return &p->stats; /* Return Device status */
1702
1703 } /* End of SK_get_stats() */
1704
1705 #ifdef HAVE_MULTICAST
1706
1707 /*-
1708 * Function : set_multicast_list
1709 * Author : Patrick J.D. Weichmann
1710 * Date Created : 94/05/26
1711 *
1712 * Description : This function gets called when a program performs
1713 * a SIOCSIFFLAGS call. Ifconfig does this if you call
1714 * 'ifconfig [-]allmulti' which enables or disables the
1715 * Promiscuous mode.
1716 * Promiscuous mode is when the Network card accepts all
1717 * packets, not only the packets which match our MAC
1718 * Address. It is useful for writing a network monitor,
1719 * but it is also a security problem. You have to remember
1720 * that all information on the net is not encrypted.
1721 *
1722 * Parameters : I : struct device *dev - SK_G16 device Structure
1723 * I : int num_addrs - explanation further down
1724 * I : void *addrs -
1725 * Return Value : None
1726 * Errors : None
1727 * Globals : None
1728 * Update History :
1729 * YY/MM/DD uid Description
1730 -*/
1731
1732
1733 /* Set or clear the multicast filter for SK_G16.
1734 *
1735 * num_addrs == -1 Promiscuous mode, receive all packets
1736 * num_addrs == 0 Normal mode, clear multicast list
1737 * num_addrs > 0 Multicast mode, receive normal and MC packets
1738 */
1739
1740 static void set_multicast_list(struct device *dev, int num_addrs, void *addrs)
/* */
1741 {
1742
1743 if (num_addrs == -1)
1744 {
1745 /* Reinitialize LANCE with MODE_PROM set */
1746 SK_lance_init(dev, MODE_PROM);
1747 }
1748 else if (num_addrs == 0)
1749 {
1750 /* Reinitialize LANCE without MODE_PROM */
1751 SK_lance_init(dev, MODE_NORMAL);
1752 }
1753 else
1754 {
1755 /* Multicast with logical address filter on */
1756
1757 /* Not implemented yet. */
1758 }
1759 } /* End of set_multicast_list() */
1760
1761 #endif
1762
1763
1764
1765 /*-
1766 * Function : SK_rom_addr
1767 * Author : Patrick J.D. Weichmann
1768 * Date Created : 94/06/01
1769 *
1770 * Description : Try to find a Boot_ROM at all possible locations
1771 *
1772 * Parameters : None
1773 * Return Value : Address where Boot_ROM is
1774 * Errors : 0 - Did not find Boot_ROM
1775 * Globals : None
1776 * Update History :
1777 * YY/MM/DD uid Description
1778 -*/
1779
1780 unsigned int SK_rom_addr(void)
/* */
1781 {
1782 int i,j;
1783 int rom_found = 0;
1784 unsigned int rom_location[] = SK_BOOT_ROM_LOCATIONS;
1785 unsigned char rom_id[] = SK_BOOT_ROM_ID;
1786 unsigned char *test_byte;
1787
1788 /* Autodetect Boot_ROM */
1789 PRINTK(("## %s: Autodetection of Boot_ROM\n", SK_NAME));
1790
1791 for (i = 0; (rom_location[i] != 0) && (rom_found == 0); i++)
1792 {
1793
1794 PRINTK(("## Trying ROM location %#08x", rom_location[i]));
1795
1796 rom_found = 1;
1797 for (j = 0; j < 6; j++)
1798 {
1799 test_byte = (unsigned char *) (rom_location[i]+j);
1800 PRINTK((" %02x ", *test_byte));
1801
1802 if(!(*test_byte == rom_id[j]))
1803 {
1804 rom_found = 0;
1805 }
1806 }
1807 PRINTK(("\n"));
1808 }
1809
1810 if (rom_found == 1)
1811 {
1812 PRINTK(("## %s: Boot_ROM found at %#08x\n",
1813 SK_NAME, rom_location[(i-1)]));
1814
1815 return (rom_location[--i]);
1816 }
1817 else
1818 {
1819 PRINTK(("%s: No Boot_ROM found\n", SK_NAME));
1820 return 0;
1821 }
1822 } /* End of SK_rom_addr() */
1823
1824
1825
1826 /* LANCE access functions
1827 *
1828 * ! CSR1-3 can only be accessed when in CSR0 the STOP bit is set !
1829 */
1830
1831
1832 /*-
1833 * Function : SK_reset_board
1834 *
1835 * Author : Patrick J.D. Weichmann
1836 *
1837 * Date Created : 94/05/25
1838 *
1839 * Description : This function resets SK_G16 and all components, but
1840 * POS registers are not changed
1841 *
1842 * Parameters : None
1843 * Return Value : None
1844 * Errors : None
1845 * Globals : SK_RAM *board - SK_RAM structure pointer
1846 *
1847 * Update History :
1848 * YY/MM/DD uid Description
1849 -*/
1850
1851 void SK_reset_board(void)
/* */
1852 {
1853 int i;
1854
1855 SK_PORT = 0x00; /* Reset active */
1856 for (i = 0; i < 10 ; i++) /* Delay min 5ms */
1857 ;
1858 SK_PORT = SK_RESET; /* Set back to normal operation */
1859
1860 } /* End of SK_reset_board() */
1861
1862
1863 /*-
1864 * Function : SK_set_RAP
1865 * Author : Patrick J.D. Weichmann
1866 * Date Created : 94/05/25
1867 *
1868 * Description : Set LANCE Register Address Port to register
1869 * for later data transfer.
1870 *
1871 * Parameters : I : reg_number - which CSR to read/write from/to
1872 * Return Value : None
1873 * Errors : None
1874 * Globals : SK_RAM *board - SK_RAM structure pointer
1875 * Update History :
1876 * YY/MM/DD uid Description
1877 -*/
1878
1879 void SK_set_RAP(int reg_number)
/* */
1880 {
1881 SK_IOREG = reg_number;
1882 SK_PORT = SK_RESET | SK_RAP | SK_WREG;
1883 SK_IOCOM = SK_DOIO;
1884
1885 while (SK_PORT & SK_IORUN)
1886 ;
1887 } /* End of SK_set_RAP() */
1888
1889
1890 /*-
1891 * Function : SK_read_reg
1892 * Author : Patrick J.D. Weichmann
1893 * Date Created : 94/05/25
1894 *
1895 * Description : Set RAP and read data from a LANCE CSR register
1896 *
1897 * Parameters : I : reg_number - which CSR to read from
1898 * Return Value : Register contents
1899 * Errors : None
1900 * Globals : SK_RAM *board - SK_RAM structure pointer
1901 * Update History :
1902 * YY/MM/DD uid Description
1903 -*/
1904
1905 int SK_read_reg(int reg_number)
/* */
1906 {
1907 SK_set_RAP(reg_number);
1908
1909 SK_PORT = SK_RESET | SK_RDATA | SK_RREG;
1910 SK_IOCOM = SK_DOIO;
1911
1912 while (SK_PORT & SK_IORUN)
1913 ;
1914 return (SK_IOREG);
1915
1916 } /* End of SK_read_reg() */
1917
1918
1919 /*-
1920 * Function : SK_rread_reg
1921 * Author : Patrick J.D. Weichmann
1922 * Date Created : 94/05/28
1923 *
1924 * Description : Read data from preseted register.
1925 * This function requires that you know which
1926 * Register is actually set. Be aware that CSR1-3
1927 * can only be accessed when in CSR0 STOP is set.
1928 *
1929 * Return Value : Register contents
1930 * Errors : None
1931 * Globals : SK_RAM *board - SK_RAM structure pointer
1932 * Update History :
1933 * YY/MM/DD uid Description
1934 -*/
1935
1936 int SK_rread_reg(void)
/* */
1937 {
1938 SK_PORT = SK_RESET | SK_RDATA | SK_RREG;
1939
1940 SK_IOCOM = SK_DOIO;
1941
1942 while (SK_PORT & SK_IORUN)
1943 ;
1944 return (SK_IOREG);
1945
1946 } /* End of SK_rread_reg() */
1947
1948
1949 /*-
1950 * Function : SK_write_reg
1951 * Author : Patrick J.D. Weichmann
1952 * Date Created : 94/05/25
1953 *
1954 * Description : This function sets the RAP then fills in the
1955 * LANCE I/O Reg and starts Transfer to LANCE.
1956 * It waits until transfer has ended which is max. 7 ms
1957 * and then it returns.
1958 *
1959 * Parameters : I : reg_number - which CSR to write to
1960 * I : value - what value to fill into register
1961 * Return Value : None
1962 * Errors : None
1963 * Globals : SK_RAM *board - SK_RAM structure pointer
1964 * Update History :
1965 * YY/MM/DD uid Description
1966 -*/
1967
1968 void SK_write_reg(int reg_number, int value)
/* */
1969 {
1970 SK_set_RAP(reg_number);
1971
1972 SK_IOREG = value;
1973 SK_PORT = SK_RESET | SK_RDATA | SK_WREG;
1974 SK_IOCOM = SK_DOIO;
1975
1976 while (SK_PORT & SK_IORUN)
1977 ;
1978 } /* End of SK_write_reg */
1979
1980
1981
1982 /*
1983 * Debugging functions
1984 * -------------------
1985 */
1986
1987 /*-
1988 * Function : SK_print_pos
1989 * Author : Patrick J.D. Weichmann
1990 * Date Created : 94/05/25
1991 *
1992 * Description : This function prints out the 4 POS (Programmable
1993 * Option Select) Registers. Used mainly to debug operation.
1994 *
1995 * Parameters : I : struct device *dev - SK_G16 device structure
1996 * I : char * - Text which will be printed as title
1997 * Return Value : None
1998 * Errors : None
1999 * Update History :
2000 * YY/MM/DD uid Description
2001 -*/
2002
2003 void SK_print_pos(struct device *dev, char *text)
/* */
2004 {
2005 int ioaddr = dev->base_addr;
2006
2007 unsigned char pos0 = inb(SK_POS0),
2008 pos1 = inb(SK_POS1),
2009 pos2 = inb(SK_POS2),
2010 pos3 = inb(SK_POS3),
2011 pos4 = inb(SK_POS4);
2012
2013
2014 printk("## %s: %s.\n"
2015 "## pos0=%#4x pos1=%#4x pos2=%#04x pos3=%#08x pos4=%#04x\n",
2016 SK_NAME, text, pos0, pos1, pos2, (pos3<<14), pos4);
2017
2018 } /* End of SK_print_pos() */
2019
2020
2021
2022 /*-
2023 * Function : SK_print_dev
2024 * Author : Patrick J.D. Weichmann
2025 * Date Created : 94/05/25
2026 *
2027 * Description : This function simply prints out the important fields
2028 * of the device structure.
2029 *
2030 * Parameters : I : struct device *dev - SK_G16 device structure
2031 * I : char *text - Title for printing
2032 * Return Value : None
2033 * Errors : None
2034 * Update History :
2035 * YY/MM/DD uid Description
2036 -*/
2037
2038 void SK_print_dev(struct device *dev, char *text)
/* */
2039 {
2040 if (dev == NULL)
2041 {
2042 printk("## %s: Device Structure. %s\n", SK_NAME, text);
2043 printk("## DEVICE == NULL\n");
2044 }
2045 else
2046 {
2047 printk("## %s: Device Structure. %s\n", SK_NAME, text);
2048 printk("## Device Name: %s Base Address: %#06x IRQ: %d\n",
2049 dev->name, dev->base_addr, dev->irq);
2050
2051 printk("## FLAGS: start: %d tbusy: %d int: %d\n",
2052 dev->start, dev->tbusy, dev->interrupt);
2053
2054 printk("## next device: %#08x init function: %#08x\n",
2055 (int) dev->next, (int) dev->init);
2056 }
2057
2058 } /* End of SK_print_dev() */
2059
2060
2061
2062 /*-
2063 * Function : SK_print_ram
2064 * Author : Patrick J.D. Weichmann
2065 * Date Created : 94/06/02
2066 *
2067 * Description : This function is used to check how are things set up
2068 * in the 16KB RAM. Also the pointers to the receive and
2069 * transmit descriptor rings and rx and tx buffers locations.
2070 * It contains a minor bug in printing, but has no effect to the values
2071 * only newlines are not correct.
2072 *
2073 * Parameters : I : struct device *dev - SK_G16 device structure
2074 * Return Value : None
2075 * Errors : None
2076 * Globals : None
2077 * Update History :
2078 * YY/MM/DD uid Description
2079 -*/
2080
2081 void SK_print_ram(struct device *dev)
/* ![[last]](../icons/n_last.png)
*/
2082 {
2083
2084 int i;
2085 struct priv *p = (struct priv *) dev->priv;
2086
2087 printk("## %s: RAM Details.\n"
2088 "## RAM at %#08x tmdhead: %#08x rmdhead: %#08x initblock: %#08x\n",
2089 SK_NAME,
2090 (unsigned int) p->ram,
2091 (unsigned int) p->tmdhead,
2092 (unsigned int) p->rmdhead,
2093 (unsigned int) &(p->ram)->ib);
2094
2095 printk("## ");
2096
2097 for(i = 0; i < TMDNUM; i++)
2098 {
2099 if (!(i % 3)) /* Every third line do a newline */
2100 {
2101 printk("\n## ");
2102 }
2103 printk("tmdbufs%d: %#08x ", (i+1), (int) p->tmdbufs[i]);
2104 }
2105 printk("## ");
2106
2107 for(i = 0; i < RMDNUM; i++)
2108 {
2109 if (!(i % 3)) /* Every third line do a newline */
2110 {
2111 printk("\n## ");
2112 }
2113 printk("rmdbufs%d: %#08x ", (i+1), (int) p->rmdbufs[i]);
2114 }
2115 printk("\n");
2116
2117 } /* End of SK_print_ram() */
2118
![[bottom]](../icons/n_bottom.png){kind=icon}
*/