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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 #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 if (p == NULL)
792 return -ENOMEM;
793 memset((char *) dev->priv, 0, sizeof(struct priv)); /* clear memory */
794
795 /* Assign our Device Driver functions */
796
797 dev->open = &SK_open;
798 dev->stop = &SK_close;
799 dev->hard_start_xmit = &SK_send_packet;
800 dev->get_stats = &SK_get_stats;
801
802 #ifdef HAVE_MULTICAST
803 dev->set_multicast_list = &set_multicast_list;
804 #endif
805
806
807 /* Set the generic fields of the device structure */
808
809 ether_setup(dev);
810
811 /* Initialize private structure */
812
813 p->ram = (struct SK_ram *) rom_addr; /* Set dual ported RAM addr */
814 p->tmdhead = &(p->ram)->tmde[0]; /* Set TMD head */
815 p->rmdhead = &(p->ram)->rmde[0]; /* Set RMD head */
816
817 /* Initialize buffer pointers */
818
819 for (i = 0; i < TMDNUM; i++)
820 {
821 p->tmdbufs[i] = &(p->ram)->tmdbuf[i];
822 }
823
824 for (i = 0; i < RMDNUM; i++)
825 {
826 p->rmdbufs[i] = &(p->ram)->rmdbuf[i];
827 }
828
829 #ifdef SK_DEBUG
830 SK_print_pos(dev, "End of SK_probe");
831 SK_print_ram(dev);
832 #endif
833
834 return 0; /* Initialization done */
835
836 } /* End of SK_probe() */
837
838
839 /*-
840 * Function : SK_open
841 * Author : Patrick J.D. Weichmann
842 * Date Created : 94/05/26
843 *
844 * Description : This function is called sometimes after booting
845 * when ifconfig program is run.
846 *
847 * This function requests an IRQ, sets the correct
848 * IRQ in the card. Then calls SK_lance_init() to
849 * init and start the LANCE chip. Then if everything is
850 * ok returns with 0 (OK), which means SK_G16 is now
851 * opened and operational.
852 *
853 * (Called by dev_open() /net/inet/dev.c)
854 *
855 * Parameters : I : struct device *dev - SK_G16 device structure
856 * Return Value : 0 - Device opened
857 * Errors : -EAGAIN - Open failed
858 * Globals : irq2dev_map - which device uses which irq
859 * Side Effects : None
860 * Update History :
861 * YY/MM/DD uid Description
862 -*/
863
864 static int SK_open(struct device *dev)
/* */
865 {
866 int i = 0;
867 int irqval = 0;
868 int ioaddr = dev->base_addr;
869
870 int irqtab[] = SK_IRQS;
871
872 struct priv *p = (struct priv *)dev->priv;
873
874 PRINTK(("## %s: At beginning of SK_open(). CSR0: %#06x\n",
875 SK_NAME, SK_read_reg(CSR0)));
876
877 if (dev->irq == 0) /* Autoirq */
878 {
879 i = 0;
880
881 /*
882 * Check if one IRQ out of SK_IRQS is free and install
883 * interrupt handler.
884 * Most done by request_irq().
885 * irqval: 0 - interrupt handler installed for IRQ irqtab[i]
886 * -EBUSY - interrupt busy
887 * -EINVAL - irq > 15 or handler = NULL
888 */
889
890 do
891 {
892 irqval = request_irq(irqtab[i], &SK_interrupt, 0, "sk_g16");
893 i++;
894 } while (irqval && irqtab[i]);
895
896 if (irqval) /* We tried every possible IRQ but no success */
897 {
898 printk("%s: unable to get an IRQ\n", dev->name);
899 return -EAGAIN;
900 }
901
902 dev->irq = irqtab[--i];
903
904 outb(i<<2, SK_POS4); /* Set Card on probed IRQ */
905
906 }
907 else if (dev->irq == 2) /* IRQ2 is always IRQ9 */
908 {
909 if (request_irq(9, &SK_interrupt, 0, "sk_g16"))
910 {
911 printk("%s: unable to get IRQ 9\n", dev->name);
912 return -EAGAIN;
913 }
914 dev->irq = 9;
915
916 /*
917 * Now we set card on IRQ2.
918 * This can be confusing, but remember that IRQ2 on the network
919 * card is in reality IRQ9
920 */
921 outb(0x08, SK_POS4); /* set card to IRQ2 */
922
923 }
924 else /* Check IRQ as defined in Space.c */
925 {
926 int i = 0;
927
928 /* check if IRQ free and valid. Then install Interrupt handler */
929
930 if (request_irq(dev->irq, &SK_interrupt, 0, "sk_g16"))
931 {
932 printk("%s: unable to get selected IRQ\n", dev->name);
933 return -EAGAIN;
934 }
935
936 switch(dev->irq)
937 {
938 case 3: i = 0;
939 break;
940 case 5: i = 1;
941 break;
942 case 2: i = 2;
943 break;
944 case 11:i = 3;
945 break;
946 default:
947 printk("%s: Preselected IRQ %d is invalid for %s boards",
948 dev->name,
949 dev->irq,
950 SK_NAME);
951 return -EAGAIN;
952 }
953
954 outb(i<<2, SK_POS4); /* Set IRQ on card */
955 }
956
957 irq2dev_map[dev->irq] = dev; /* Set IRQ as used by us */
958
959 printk("%s: Schneider & Koch G16 at %#3x, IRQ %d, shared mem at %#08x\n",
960 dev->name, (unsigned int)dev->base_addr,
961 (int) dev->irq, (unsigned int) p->ram);
962
963 if (!(i = SK_lance_init(dev, 0))) /* LANCE init OK? */
964 {
965
966
967 dev->tbusy = 0;
968 dev->interrupt = 0;
969 dev->start = 1;
970
971 #ifdef SK_DEBUG
972
973 /*
974 * This debug block tries to stop LANCE,
975 * reinit LANCE with transmitter and receiver disabled,
976 * then stop again and reinit with NORMAL_MODE
977 */
978
979 printk("## %s: After lance init. CSR0: %#06x\n",
980 SK_NAME, SK_read_reg(CSR0));
981 SK_write_reg(CSR0, CSR0_STOP);
982 printk("## %s: LANCE stopped. CSR0: %#06x\n",
983 SK_NAME, SK_read_reg(CSR0));
984 SK_lance_init(dev, MODE_DTX | MODE_DRX);
985 printk("## %s: Reinit with DTX + DRX off. CSR0: %#06x\n",
986 SK_NAME, SK_read_reg(CSR0));
987 SK_write_reg(CSR0, CSR0_STOP);
988 printk("## %s: LANCE stopped. CSR0: %#06x\n",
989 SK_NAME, SK_read_reg(CSR0));
990 SK_lance_init(dev, MODE_NORMAL);
991 printk("## %s: LANCE back to normal mode. CSR0: %#06x\n",
992 SK_NAME, SK_read_reg(CSR0));
993 SK_print_pos(dev, "POS regs before returning OK");
994
995 #endif /* SK_DEBUG */
996
997 return 0; /* SK_open() is successful */
998 }
999 else /* LANCE init failed */
1000 {
1001
1002 PRINTK(("## %s: LANCE init failed: CSR0: %#06x\n",
1003 SK_NAME, SK_read_reg(CSR0)));
1004
1005 dev->start = 0; /* Device not ready */
1006 return -EAGAIN;
1007 }
1008
1009 } /* End of SK_open() */
1010
1011
1012 /*-
1013 * Function : SK_lance_init
1014 * Author : Patrick J.D. Weichmann
1015 * Date Created : 94/05/26
1016 *
1017 * Description : Reset LANCE chip, fill RMD, TMD structures with
1018 * start values and Start LANCE.
1019 *
1020 * Parameters : I : struct device *dev - SK_G16 device structure
1021 * I : int mode - put LANCE into "mode" see data-sheet for
1022 * more info.
1023 * Return Value : 0 - Init done
1024 * Errors : -1 - Init failed
1025 * Update History :
1026 * YY/MM/DD uid Description
1027 -*/
1028
1029 static int SK_lance_init(struct device *dev, unsigned short mode)
/* */
1030 {
1031 int i;
1032 struct priv *p = (struct priv *) dev->priv;
1033 struct tmd *tmdp;
1034 struct rmd *rmdp;
1035
1036 PRINTK(("## %s: At beginning of LANCE init. CSR0: %#06x\n",
1037 SK_NAME, SK_read_reg(CSR0)));
1038
1039 /* Reset LANCE */
1040 SK_reset_board();
1041
1042 /* Initialize TMD's with start values */
1043 p->tmdnum = 0; /* First descriptor for transmitting */
1044 p->tmdlast = 0; /* First descriptor for reading stats */
1045
1046 for (i = 0; i < TMDNUM; i++) /* Init all TMD's */
1047 {
1048 tmdp = p->tmdhead + i;
1049
1050 tmdp->u.buffer = (unsigned long) p->tmdbufs[i]; /* assign buffer */
1051
1052 /* Mark TMD as start and end of packet */
1053 tmdp->u.s.status = TX_STP | TX_ENP;
1054 }
1055
1056
1057 /* Initialize RMD's with start values */
1058
1059 p->rmdnum = 0; /* First RMD which will be used */
1060
1061 for (i = 0; i < RMDNUM; i++) /* Init all RMD's */
1062 {
1063 rmdp = p->rmdhead + i;
1064
1065
1066 rmdp->u.buffer = (unsigned long) p->rmdbufs[i]; /* assign buffer */
1067
1068 /*
1069 * LANCE must be owner at beginning so that he can fill in
1070 * receiving packets, set status and release RMD
1071 */
1072
1073 rmdp->u.s.status = RX_OWN;
1074
1075 rmdp->blen = -PKT_BUF_SZ; /* Buffer Size in a two's complement */
1076
1077 rmdp->mlen = 0; /* init message length */
1078
1079 }
1080
1081 /* Fill LANCE Initialize Block */
1082
1083 (p->ram)->ib.mode = mode; /* Set operation mode */
1084
1085 for (i = 0; i < ETH_ALEN; i++) /* Set physical address */
1086 {
1087 (p->ram)->ib.paddr[i] = dev->dev_addr[i];
1088 }
1089
1090 for (i = 0; i < 8; i++) /* Set multicast, logical address */
1091 {
1092 (p->ram)->ib.laddr[i] = 0; /* We do not use logical addressing */
1093 }
1094
1095 /* Set ring descriptor pointers and set number of descriptors */
1096
1097 (p->ram)->ib.rdrp = (int) p->rmdhead | RMDNUMMASK;
1098 (p->ram)->ib.tdrp = (int) p->tmdhead | TMDNUMMASK;
1099
1100 /* Prepare LANCE Control and Status Registers */
1101
1102 cli();
1103
1104 SK_write_reg(CSR3, CSR3_ACON); /* Ale Control !!!THIS MUST BE SET!!!! */
1105
1106 /*
1107 * LANCE addresses the RAM from 0x0000 to 0x3fbf and has no access to
1108 * PC Memory locations.
1109 *
1110 * In structure SK_ram is defined that the first thing in ram
1111 * is the initialization block. So his address is for LANCE always
1112 * 0x0000
1113 *
1114 * CSR1 contains low order bits 15:0 of initialization block address
1115 * CSR2 is built of:
1116 * 7:0 High order bits 23:16 of initialization block address
1117 * 15:8 reserved, must be 0
1118 */
1119
1120 /* Set initialization block address (must be on word boundary) */
1121 SK_write_reg(CSR1, 0); /* Set low order bits 15:0 */
1122 SK_write_reg(CSR2, 0); /* Set high order bits 23:16 */
1123
1124
1125 PRINTK(("## %s: After setting CSR1-3. CSR0: %#06x\n",
1126 SK_NAME, SK_read_reg(CSR0)));
1127
1128 /* Initialize LANCE */
1129
1130 /*
1131 * INIT = Initialize, when set, causes the LANCE to begin the
1132 * initialization procedure and access the Init Block.
1133 */
1134
1135 SK_write_reg(CSR0, CSR0_INIT);
1136
1137 sti();
1138
1139 /* Wait until LANCE finished initialization */
1140
1141 SK_set_RAP(CSR0); /* Register Address Pointer to CSR0 */
1142
1143 for (i = 0; (i < 100) && !(SK_rread_reg() & CSR0_IDON); i++)
1144 ; /* Wait until init done or go ahead if problems (i>=100) */
1145
1146 if (i >= 100) /* Something is wrong ! */
1147 {
1148 printk("%s: can't init am7990, status: %04x "
1149 "init_block: %#08x\n",
1150 dev->name, (int) SK_read_reg(CSR0),
1151 (unsigned int) &(p->ram)->ib);
1152
1153 #ifdef SK_DEBUG
1154 SK_print_pos(dev, "LANCE INIT failed");
1155 SK_print_dev(dev,"Device Structure:");
1156 #endif
1157
1158 return -1; /* LANCE init failed */
1159 }
1160
1161 PRINTK(("## %s: init done after %d ticks\n", SK_NAME, i));
1162
1163 /* Clear Initialize done, enable Interrupts, start LANCE */
1164
1165 SK_write_reg(CSR0, CSR0_IDON | CSR0_INEA | CSR0_STRT);
1166
1167 PRINTK(("## %s: LANCE started. CSR0: %#06x\n", SK_NAME,
1168 SK_read_reg(CSR0)));
1169
1170 return 0; /* LANCE is up and running */
1171
1172 } /* End of SK_lance_init() */
1173
1174
1175
1176 /*-
1177 * Function : SK_send_packet
1178 * Author : Patrick J.D. Weichmann
1179 * Date Created : 94/05/27
1180 *
1181 * Description : Writes an socket buffer into a transmit descriptor
1182 * and starts transmission.
1183 *
1184 * Parameters : I : struct sk_buff *skb - packet to transfer
1185 * I : struct device *dev - SK_G16 device structure
1186 * Return Value : 0 - OK
1187 * 1 - Could not transmit (dev_queue_xmit will queue it)
1188 * and try to sent it later
1189 * Globals : None
1190 * Side Effects : None
1191 * Update History :
1192 * YY/MM/DD uid Description
1193 -*/
1194
1195 static int SK_send_packet(struct sk_buff *skb, struct device *dev)
/* */
1196 {
1197 struct priv *p = (struct priv *) dev->priv;
1198 struct tmd *tmdp;
1199
1200 if (dev->tbusy)
1201 {
1202 /* if Transmitter more than 150ms busy -> time_out */
1203
1204 int tickssofar = jiffies - dev->trans_start;
1205 if (tickssofar < 15)
1206 {
1207 return 1; /* We have to try transmit later */
1208 }
1209
1210 printk("%s: xmitter timed out, try to restart!\n", dev->name);
1211
1212 SK_lance_init(dev, MODE_NORMAL); /* Reinit LANCE */
1213
1214 dev->tbusy = 0; /* Clear Transmitter flag */
1215
1216 dev->trans_start = jiffies; /* Mark Start of transmission */
1217
1218 }
1219
1220 /*
1221 * If some upper Layer thinks we missed a transmit done interrupt
1222 * we are passed NULL.
1223 * (dev_queue_xmit net/inet/dev.c
1224 */
1225
1226 if (skb == NULL)
1227 {
1228 /*
1229 * Dequeue packets from transmit queue and send them.
1230 */
1231 dev_tint(dev);
1232
1233 return 0;
1234 }
1235
1236 PRINTK2(("## %s: SK_send_packet() called, CSR0 %#04x.\n",
1237 SK_NAME, SK_read_reg(CSR0)));
1238
1239
1240 /*
1241 * Block a timer-based transmit from overlapping.
1242 * This means check if we are already in.
1243 */
1244
1245 if (set_bit(0, (void *) &dev->tbusy) != 0) /* dev->tbusy already set ? */
1246 {
1247 printk("%s: Transmitter access conflict.\n", dev->name);
1248 }
1249 else
1250 {
1251 /* Evaluate Packet length */
1252 short len = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
1253
1254 tmdp = p->tmdhead + p->tmdnum; /* Which descriptor for transmitting */
1255
1256 /* Fill in Transmit Message Descriptor */
1257
1258 /* Copy data into dual ported ram */
1259
1260 memcpy((char *) (tmdp->u.buffer & 0x00ffffff), (char *)skb->data,
1261 skb->len);
1262
1263 tmdp->blen = -len; /* set length to transmit */
1264
1265 /*
1266 * Packet start and end is always set because we use the maximum
1267 * packet length as buffer length.
1268 * Relinquish ownership to LANCE
1269 */
1270
1271 tmdp->u.s.status = TX_OWN | TX_STP | TX_ENP;
1272
1273 /* Start Demand Transmission */
1274 SK_write_reg(CSR0, CSR0_TDMD | CSR0_INEA);
1275
1276 dev->trans_start = jiffies; /* Mark start of transmission */
1277
1278 /* Set pointer to next transmit buffer */
1279 p->tmdnum++;
1280 p->tmdnum &= TMDNUM-1;
1281
1282 /* Do we own the next transmit buffer ? */
1283 if (! ((p->tmdhead + p->tmdnum)->u.s.status & TX_OWN) )
1284 {
1285 /*
1286 * We own next buffer and are ready to transmit, so
1287 * clear busy flag
1288 */
1289 dev->tbusy = 0;
1290 }
1291 }
1292 dev_kfree_skb(skb, FREE_WRITE);
1293 return 0;
1294 } /* End of SK_send_packet */
1295
1296
1297 /*-
1298 * Function : SK_interrupt
1299 * Author : Patrick J.D. Weichmann
1300 * Date Created : 94/05/27
1301 *
1302 * Description : SK_G16 interrupt handler which checks for LANCE
1303 * Errors, handles transmit and receive interrupts
1304 *
1305 * Parameters : I : int irq, struct pt_regs * regs -
1306 * Return Value : None
1307 * Errors : None
1308 * Globals : None
1309 * Side Effects : None
1310 * Update History :
1311 * YY/MM/DD uid Description
1312 -*/
1313
1314 static void SK_interrupt(int irq, struct pt_regs * regs)
/* */
1315 {
1316 int csr0;
1317 struct device *dev = (struct device *) irq2dev_map[irq];
1318 struct priv *p = (struct priv *) dev->priv;
1319
1320
1321 PRINTK2(("## %s: SK_interrupt(). status: %#06x\n",
1322 SK_NAME, SK_read_reg(CSR0)));
1323
1324 if (dev == NULL)
1325 {
1326 printk("SK_interrupt(): IRQ %d for unknown device.\n", irq);
1327 }
1328
1329
1330 if (dev->interrupt)
1331 {
1332 printk("%s: Re-entering the interrupt handler.\n", dev->name);
1333 }
1334
1335 csr0 = SK_read_reg(CSR0); /* store register for checking */
1336
1337 dev->interrupt = 1; /* We are handling an interrupt */
1338
1339 /*
1340 * Acknowledge all of the current interrupt sources, disable
1341 * Interrupts (INEA = 0)
1342 */
1343
1344 SK_write_reg(CSR0, csr0 & CSR0_CLRALL);
1345
1346 if (csr0 & CSR0_ERR) /* LANCE Error */
1347 {
1348 printk("%s: error: %04x\n", dev->name, csr0);
1349
1350 if (csr0 & CSR0_MISS) /* No place to store packet ? */
1351 {
1352 p->stats.rx_dropped++;
1353 }
1354 }
1355
1356 if (csr0 & CSR0_RINT) /* Receive Interrupt (packet arrived) */
1357 {
1358 SK_rxintr(dev);
1359 }
1360
1361 if (csr0 & CSR0_TINT) /* Transmit interrupt (packet sent) */
1362 {
1363 SK_txintr(dev);
1364 }
1365
1366 SK_write_reg(CSR0, CSR0_INEA); /* Enable Interrupts */
1367
1368 dev->interrupt = 0; /* We are out */
1369 } /* End of SK_interrupt() */
1370
1371
1372 /*-
1373 * Function : SK_txintr
1374 * Author : Patrick J.D. Weichmann
1375 * Date Created : 94/05/27
1376 *
1377 * Description : After sending a packet we check status, update
1378 * statistics and relinquish ownership of transmit
1379 * descriptor ring.
1380 *
1381 * Parameters : I : struct device *dev - SK_G16 device structure
1382 * Return Value : None
1383 * Errors : None
1384 * Globals : None
1385 * Update History :
1386 * YY/MM/DD uid Description
1387 -*/
1388
1389 static void SK_txintr(struct device *dev)
/* */
1390 {
1391 int tmdstat;
1392 struct tmd *tmdp;
1393 struct priv *p = (struct priv *) dev->priv;
1394
1395
1396 PRINTK2(("## %s: SK_txintr() status: %#06x\n",
1397 SK_NAME, SK_read_reg(CSR0)));
1398
1399 tmdp = p->tmdhead + p->tmdlast; /* Which buffer we sent at last ? */
1400
1401 /* Set next buffer */
1402 p->tmdlast++;
1403 p->tmdlast &= TMDNUM-1;
1404
1405 tmdstat = tmdp->u.s.status & 0xff00; /* filter out status bits 15:08 */
1406
1407 /*
1408 * We check status of transmitted packet.
1409 * see LANCE data-sheet for error explanation
1410 */
1411 if (tmdstat & TX_ERR) /* Error occurred */
1412 {
1413 printk("%s: TX error: %04x %04x\n", dev->name, (int) tmdstat,
1414 (int) tmdp->status2);
1415
1416 if (tmdp->status2 & TX_TDR) /* TDR problems? */
1417 {
1418 printk("%s: tdr-problems \n", dev->name);
1419 }
1420
1421 if (tmdp->status2 & TX_RTRY) /* Failed in 16 attempts to transmit ? */
1422 p->stats.tx_aborted_errors++;
1423 if (tmdp->status2 & TX_LCOL) /* Late collision ? */
1424 p->stats.tx_window_errors++;
1425 if (tmdp->status2 & TX_LCAR) /* Loss of Carrier ? */
1426 p->stats.tx_carrier_errors++;
1427 if (tmdp->status2 & TX_UFLO) /* Underflow error ? */
1428 {
1429 p->stats.tx_fifo_errors++;
1430
1431 /*
1432 * If UFLO error occurs it will turn transmitter of.
1433 * So we must reinit LANCE
1434 */
1435
1436 SK_lance_init(dev, MODE_NORMAL);
1437 }
1438
1439 p->stats.tx_errors++;
1440
1441 tmdp->status2 = 0; /* Clear error flags */
1442 }
1443 else if (tmdstat & TX_MORE) /* Collisions occurred ? */
1444 {
1445 /*
1446 * Here I have a problem.
1447 * I only know that there must be one or up to 15 collisions.
1448 * Thats why TX_MORE is set, because after 16 attempts TX_RTRY
1449 * will be set which means couldn't send packet aborted transfer.
1450 *
1451 * First I did not have this in but then I thought at minimum
1452 * we see that something was not ok.
1453 * If anyone knows something better than this to handle this
1454 * please report it. (see Email addresses in the README file)
1455 */
1456
1457 p->stats.collisions++;
1458 }
1459 else /* Packet sent without any problems */
1460 {
1461 p->stats.tx_packets++;
1462 }
1463
1464 /*
1465 * We mark transmitter not busy anymore, because now we have a free
1466 * transmit descriptor which can be filled by SK_send_packet and
1467 * afterwards sent by the LANCE
1468 */
1469
1470 dev->tbusy = 0;
1471
1472 /*
1473 * mark_bh(NET_BH);
1474 * This will cause net_bh() to run after this interrupt handler.
1475 *
1476 * The function which do handle slow IRQ parts is do_bottom_half()
1477 * which runs at normal kernel priority, that means all interrupt are
1478 * enabled. (see kernel/irq.c)
1479 *
1480 * net_bh does something like this:
1481 * - check if already in net_bh
1482 * - try to transmit something from the send queue
1483 * - if something is in the receive queue send it up to higher
1484 * levels if it is a known protocol
1485 * - try to transmit something from the send queue
1486 */
1487
1488 mark_bh(NET_BH);
1489
1490 } /* End of SK_txintr() */
1491
1492
1493 /*-
1494 * Function : SK_rxintr
1495 * Author : Patrick J.D. Weichmann
1496 * Date Created : 94/05/27
1497 *
1498 * Description : Buffer sent, check for errors, relinquish ownership
1499 * of the receive message descriptor.
1500 *
1501 * Parameters : I : SK_G16 device structure
1502 * Return Value : None
1503 * Globals : None
1504 * Update History :
1505 * YY/MM/DD uid Description
1506 -*/
1507
1508 static void SK_rxintr(struct device *dev)
/* */
1509 {
1510
1511 struct rmd *rmdp;
1512 int rmdstat;
1513 struct priv *p = (struct priv *) dev->priv;
1514
1515 PRINTK2(("## %s: SK_rxintr(). CSR0: %#06x\n",
1516 SK_NAME, SK_read_reg(CSR0)));
1517
1518 rmdp = p->rmdhead + p->rmdnum;
1519
1520 /* As long as we own the next entry, check status and send
1521 * it up to higher layer
1522 */
1523
1524 while (!( (rmdstat = rmdp->u.s.status) & RX_OWN))
1525 {
1526 /*
1527 * Start and end of packet must be set, because we use
1528 * the ethernet maximum packet length (1518) as buffer size.
1529 *
1530 * Because our buffers are at maximum OFLO and BUFF errors are
1531 * not to be concerned (see Data sheet)
1532 */
1533
1534 if ((rmdstat & (RX_STP | RX_ENP)) != (RX_STP | RX_ENP))
1535 {
1536 /* Start of a frame > 1518 Bytes ? */
1537
1538 if (rmdstat & RX_STP)
1539 {
1540 p->stats.rx_errors++; /* bad packet received */
1541 p->stats.rx_length_errors++; /* packet to long */
1542
1543 printk("%s: packet too long\n", dev->name);
1544 }
1545
1546 /*
1547 * All other packets will be ignored until a new frame with
1548 * start (RX_STP) set follows.
1549 *
1550 * What we do is just give descriptor free for new incoming
1551 * packets.
1552 */
1553
1554 rmdp->u.s.status = RX_OWN; /* Relinquish ownership to LANCE */
1555
1556 }
1557 else if (rmdstat & RX_ERR) /* Receive Error ? */
1558 {
1559 printk("%s: RX error: %04x\n", dev->name, (int) rmdstat);
1560
1561 p->stats.rx_errors++;
1562
1563 if (rmdstat & RX_FRAM) p->stats.rx_frame_errors++;
1564 if (rmdstat & RX_CRC) p->stats.rx_crc_errors++;
1565
1566 rmdp->u.s.status = RX_OWN; /* Relinquish ownership to LANCE */
1567
1568 }
1569 else /* We have a packet which can be queued for the upper layers */
1570 {
1571
1572 int len = (rmdp->mlen & 0x0fff); /* extract message length from receive buffer */
1573 struct sk_buff *skb;
1574
1575 skb = dev_alloc_skb(len+2); /* allocate socket buffer */
1576
1577 if (skb == NULL) /* Could not get mem ? */
1578 {
1579
1580 /*
1581 * Couldn't allocate sk_buffer so we give descriptor back
1582 * to Lance, update statistics and go ahead.
1583 */
1584
1585 rmdp->u.s.status = RX_OWN; /* Relinquish ownership to LANCE */
1586 printk("%s: Couldn't allocate sk_buff, deferring packet.\n",
1587 dev->name);
1588 p->stats.rx_dropped++;
1589
1590 break; /* Jump out */
1591 }
1592
1593 /* Prepare sk_buff to queue for upper layers */
1594
1595 skb->dev = dev;
1596 skb_reserve(skb,2); /* Align IP header on 16 byte boundary */
1597
1598 /*
1599 * Copy data out of our receive descriptor into sk_buff.
1600 *
1601 * (rmdp->u.buffer & 0x00ffffff) -> get address of buffer and
1602 * ignore status fields)
1603 */
1604
1605 memcpy(skb_put(skb,len), (unsigned char *) (rmdp->u.buffer & 0x00ffffff),
1606 len);
1607
1608
1609 /*
1610 * Notify the upper protocol layers that there is another packet
1611 * to handle
1612 *
1613 * netif_rx() always succeeds. see /net/inet/dev.c for more.
1614 */
1615
1616 skb->protocol=eth_type_trans(skb,dev);
1617 netif_rx(skb); /* queue packet and mark it for processing */
1618
1619 /*
1620 * Packet is queued and marked for processing so we
1621 * free our descriptor and update statistics
1622 */
1623
1624 rmdp->u.s.status = RX_OWN;
1625 p->stats.rx_packets++;
1626
1627
1628 p->rmdnum++;
1629 p->rmdnum %= RMDNUM;
1630
1631 rmdp = p->rmdhead + p->rmdnum;
1632 }
1633 }
1634 } /* End of SK_rxintr() */
1635
1636
1637 /*-
1638 * Function : SK_close
1639 * Author : Patrick J.D. Weichmann
1640 * Date Created : 94/05/26
1641 *
1642 * Description : close gets called from dev_close() and should
1643 * deinstall the card (free_irq, mem etc).
1644 *
1645 * Parameters : I : struct device *dev - our device structure
1646 * Return Value : 0 - closed device driver
1647 * Errors : None
1648 * Globals : None
1649 * Update History :
1650 * YY/MM/DD uid Description
1651 -*/
1652
1653 /* I have tried to set BOOT_ROM on and RAM off but then, after a 'ifconfig
1654 * down' the system stops. So I don't shut set card to init state.
1655 */
1656
1657 static int SK_close(struct device *dev)
/* */
1658 {
1659
1660 PRINTK(("## %s: SK_close(). CSR0: %#06x\n",
1661 SK_NAME, SK_read_reg(CSR0)));
1662
1663 dev->tbusy = 1; /* Transmitter busy */
1664 dev->start = 0; /* Card down */
1665
1666 printk("%s: Shutting %s down CSR0 %#06x\n", dev->name, SK_NAME,
1667 (int) SK_read_reg(CSR0));
1668
1669 SK_write_reg(CSR0, CSR0_STOP); /* STOP the LANCE */
1670
1671 free_irq(dev->irq); /* Free IRQ */
1672 irq2dev_map[dev->irq] = 0; /* Mark IRQ as unused */
1673
1674 return 0; /* always succeed */
1675
1676 } /* End of SK_close() */
1677
1678
1679 /*-
1680 * Function : SK_get_stats
1681 * Author : Patrick J.D. Weichmann
1682 * Date Created : 94/05/26
1683 *
1684 * Description : Return current status structure to upper layers.
1685 * It is called by sprintf_stats (dev.c).
1686 *
1687 * Parameters : I : struct device *dev - our device structure
1688 * Return Value : struct enet_statistics * - our current statistics
1689 * Errors : None
1690 * Side Effects : None
1691 * Update History :
1692 * YY/MM/DD uid Description
1693 -*/
1694
1695 static struct enet_statistics *SK_get_stats(struct device *dev)
/* */
1696 {
1697
1698 struct priv *p = (struct priv *) dev->priv;
1699
1700 PRINTK(("## %s: SK_get_stats(). CSR0: %#06x\n",
1701 SK_NAME, SK_read_reg(CSR0)));
1702
1703 return &p->stats; /* Return Device status */
1704
1705 } /* End of SK_get_stats() */
1706
1707 #ifdef HAVE_MULTICAST
1708
1709 /*-
1710 * Function : set_multicast_list
1711 * Author : Patrick J.D. Weichmann
1712 * Date Created : 94/05/26
1713 *
1714 * Description : This function gets called when a program performs
1715 * a SIOCSIFFLAGS call. Ifconfig does this if you call
1716 * 'ifconfig [-]allmulti' which enables or disables the
1717 * Promiscuous mode.
1718 * Promiscuous mode is when the Network card accepts all
1719 * packets, not only the packets which match our MAC
1720 * Address. It is useful for writing a network monitor,
1721 * but it is also a security problem. You have to remember
1722 * that all information on the net is not encrypted.
1723 *
1724 * Parameters : I : struct device *dev - SK_G16 device Structure
1725 * I : int num_addrs - explanation further down
1726 * I : void *addrs -
1727 * Return Value : None
1728 * Errors : None
1729 * Globals : None
1730 * Update History :
1731 * YY/MM/DD uid Description
1732 -*/
1733
1734
1735 /* Set or clear the multicast filter for SK_G16.
1736 *
1737 * num_addrs == -1 Promiscuous mode, receive all packets
1738 * num_addrs == 0 Normal mode, clear multicast list
1739 * num_addrs > 0 Multicast mode, receive normal and MC packets
1740 */
1741
1742 static void set_multicast_list(struct device *dev, int num_addrs, void *addrs)
/* */
1743 {
1744
1745 if (num_addrs == -1)
1746 {
1747 /* Reinitialize LANCE with MODE_PROM set */
1748 SK_lance_init(dev, MODE_PROM);
1749 }
1750 else if (num_addrs == 0)
1751 {
1752 /* Reinitialize LANCE without MODE_PROM */
1753 SK_lance_init(dev, MODE_NORMAL);
1754 }
1755 else
1756 {
1757 /* Multicast with logical address filter on */
1758
1759 /* Not implemented yet. */
1760 }
1761 } /* End of set_multicast_list() */
1762
1763 #endif
1764
1765
1766
1767 /*-
1768 * Function : SK_rom_addr
1769 * Author : Patrick J.D. Weichmann
1770 * Date Created : 94/06/01
1771 *
1772 * Description : Try to find a Boot_ROM at all possible locations
1773 *
1774 * Parameters : None
1775 * Return Value : Address where Boot_ROM is
1776 * Errors : 0 - Did not find Boot_ROM
1777 * Globals : None
1778 * Update History :
1779 * YY/MM/DD uid Description
1780 -*/
1781
1782 unsigned int SK_rom_addr(void)
/* */
1783 {
1784 int i,j;
1785 int rom_found = 0;
1786 unsigned int rom_location[] = SK_BOOT_ROM_LOCATIONS;
1787 unsigned char rom_id[] = SK_BOOT_ROM_ID;
1788 unsigned char *test_byte;
1789
1790 /* Autodetect Boot_ROM */
1791 PRINTK(("## %s: Autodetection of Boot_ROM\n", SK_NAME));
1792
1793 for (i = 0; (rom_location[i] != 0) && (rom_found == 0); i++)
1794 {
1795
1796 PRINTK(("## Trying ROM location %#08x", rom_location[i]));
1797
1798 rom_found = 1;
1799 for (j = 0; j < 6; j++)
1800 {
1801 test_byte = (unsigned char *) (rom_location[i]+j);
1802 PRINTK((" %02x ", *test_byte));
1803
1804 if(!(*test_byte == rom_id[j]))
1805 {
1806 rom_found = 0;
1807 }
1808 }
1809 PRINTK(("\n"));
1810 }
1811
1812 if (rom_found == 1)
1813 {
1814 PRINTK(("## %s: Boot_ROM found at %#08x\n",
1815 SK_NAME, rom_location[(i-1)]));
1816
1817 return (rom_location[--i]);
1818 }
1819 else
1820 {
1821 PRINTK(("%s: No Boot_ROM found\n", SK_NAME));
1822 return 0;
1823 }
1824 } /* End of SK_rom_addr() */
1825
1826
1827
1828 /* LANCE access functions
1829 *
1830 * ! CSR1-3 can only be accessed when in CSR0 the STOP bit is set !
1831 */
1832
1833
1834 /*-
1835 * Function : SK_reset_board
1836 *
1837 * Author : Patrick J.D. Weichmann
1838 *
1839 * Date Created : 94/05/25
1840 *
1841 * Description : This function resets SK_G16 and all components, but
1842 * POS registers are not changed
1843 *
1844 * Parameters : None
1845 * Return Value : None
1846 * Errors : None
1847 * Globals : SK_RAM *board - SK_RAM structure pointer
1848 *
1849 * Update History :
1850 * YY/MM/DD uid Description
1851 -*/
1852
1853 void SK_reset_board(void)
/* */
1854 {
1855 int i;
1856
1857 SK_PORT = 0x00; /* Reset active */
1858 for (i = 0; i < 10 ; i++) /* Delay min 5ms */
1859 ;
1860 SK_PORT = SK_RESET; /* Set back to normal operation */
1861
1862 } /* End of SK_reset_board() */
1863
1864
1865 /*-
1866 * Function : SK_set_RAP
1867 * Author : Patrick J.D. Weichmann
1868 * Date Created : 94/05/25
1869 *
1870 * Description : Set LANCE Register Address Port to register
1871 * for later data transfer.
1872 *
1873 * Parameters : I : reg_number - which CSR to read/write from/to
1874 * Return Value : None
1875 * Errors : None
1876 * Globals : SK_RAM *board - SK_RAM structure pointer
1877 * Update History :
1878 * YY/MM/DD uid Description
1879 -*/
1880
1881 void SK_set_RAP(int reg_number)
/* */
1882 {
1883 SK_IOREG = reg_number;
1884 SK_PORT = SK_RESET | SK_RAP | SK_WREG;
1885 SK_IOCOM = SK_DOIO;
1886
1887 while (SK_PORT & SK_IORUN)
1888 ;
1889 } /* End of SK_set_RAP() */
1890
1891
1892 /*-
1893 * Function : SK_read_reg
1894 * Author : Patrick J.D. Weichmann
1895 * Date Created : 94/05/25
1896 *
1897 * Description : Set RAP and read data from a LANCE CSR register
1898 *
1899 * Parameters : I : reg_number - which CSR to read from
1900 * Return Value : Register contents
1901 * Errors : None
1902 * Globals : SK_RAM *board - SK_RAM structure pointer
1903 * Update History :
1904 * YY/MM/DD uid Description
1905 -*/
1906
1907 int SK_read_reg(int reg_number)
/* */
1908 {
1909 SK_set_RAP(reg_number);
1910
1911 SK_PORT = SK_RESET | SK_RDATA | SK_RREG;
1912 SK_IOCOM = SK_DOIO;
1913
1914 while (SK_PORT & SK_IORUN)
1915 ;
1916 return (SK_IOREG);
1917
1918 } /* End of SK_read_reg() */
1919
1920
1921 /*-
1922 * Function : SK_rread_reg
1923 * Author : Patrick J.D. Weichmann
1924 * Date Created : 94/05/28
1925 *
1926 * Description : Read data from preseted register.
1927 * This function requires that you know which
1928 * Register is actually set. Be aware that CSR1-3
1929 * can only be accessed when in CSR0 STOP is set.
1930 *
1931 * Return Value : Register contents
1932 * Errors : None
1933 * Globals : SK_RAM *board - SK_RAM structure pointer
1934 * Update History :
1935 * YY/MM/DD uid Description
1936 -*/
1937
1938 int SK_rread_reg(void)
/* */
1939 {
1940 SK_PORT = SK_RESET | SK_RDATA | SK_RREG;
1941
1942 SK_IOCOM = SK_DOIO;
1943
1944 while (SK_PORT & SK_IORUN)
1945 ;
1946 return (SK_IOREG);
1947
1948 } /* End of SK_rread_reg() */
1949
1950
1951 /*-
1952 * Function : SK_write_reg
1953 * Author : Patrick J.D. Weichmann
1954 * Date Created : 94/05/25
1955 *
1956 * Description : This function sets the RAP then fills in the
1957 * LANCE I/O Reg and starts Transfer to LANCE.
1958 * It waits until transfer has ended which is max. 7 ms
1959 * and then it returns.
1960 *
1961 * Parameters : I : reg_number - which CSR to write to
1962 * I : value - what value to fill into register
1963 * Return Value : None
1964 * Errors : None
1965 * Globals : SK_RAM *board - SK_RAM structure pointer
1966 * Update History :
1967 * YY/MM/DD uid Description
1968 -*/
1969
1970 void SK_write_reg(int reg_number, int value)
/* */
1971 {
1972 SK_set_RAP(reg_number);
1973
1974 SK_IOREG = value;
1975 SK_PORT = SK_RESET | SK_RDATA | SK_WREG;
1976 SK_IOCOM = SK_DOIO;
1977
1978 while (SK_PORT & SK_IORUN)
1979 ;
1980 } /* End of SK_write_reg */
1981
1982
1983
1984 /*
1985 * Debugging functions
1986 * -------------------
1987 */
1988
1989 /*-
1990 * Function : SK_print_pos
1991 * Author : Patrick J.D. Weichmann
1992 * Date Created : 94/05/25
1993 *
1994 * Description : This function prints out the 4 POS (Programmable
1995 * Option Select) Registers. Used mainly to debug operation.
1996 *
1997 * Parameters : I : struct device *dev - SK_G16 device structure
1998 * I : char * - Text which will be printed as title
1999 * Return Value : None
2000 * Errors : None
2001 * Update History :
2002 * YY/MM/DD uid Description
2003 -*/
2004
2005 void SK_print_pos(struct device *dev, char *text)
/* */
2006 {
2007 int ioaddr = dev->base_addr;
2008
2009 unsigned char pos0 = inb(SK_POS0),
2010 pos1 = inb(SK_POS1),
2011 pos2 = inb(SK_POS2),
2012 pos3 = inb(SK_POS3),
2013 pos4 = inb(SK_POS4);
2014
2015
2016 printk("## %s: %s.\n"
2017 "## pos0=%#4x pos1=%#4x pos2=%#04x pos3=%#08x pos4=%#04x\n",
2018 SK_NAME, text, pos0, pos1, pos2, (pos3<<14), pos4);
2019
2020 } /* End of SK_print_pos() */
2021
2022
2023
2024 /*-
2025 * Function : SK_print_dev
2026 * Author : Patrick J.D. Weichmann
2027 * Date Created : 94/05/25
2028 *
2029 * Description : This function simply prints out the important fields
2030 * of the device structure.
2031 *
2032 * Parameters : I : struct device *dev - SK_G16 device structure
2033 * I : char *text - Title for printing
2034 * Return Value : None
2035 * Errors : None
2036 * Update History :
2037 * YY/MM/DD uid Description
2038 -*/
2039
2040 void SK_print_dev(struct device *dev, char *text)
/* */
2041 {
2042 if (dev == NULL)
2043 {
2044 printk("## %s: Device Structure. %s\n", SK_NAME, text);
2045 printk("## DEVICE == NULL\n");
2046 }
2047 else
2048 {
2049 printk("## %s: Device Structure. %s\n", SK_NAME, text);
2050 printk("## Device Name: %s Base Address: %#06lx IRQ: %d\n",
2051 dev->name, dev->base_addr, dev->irq);
2052
2053 printk("## FLAGS: start: %d tbusy: %ld int: %d\n",
2054 dev->start, dev->tbusy, dev->interrupt);
2055
2056 printk("## next device: %#08x init function: %#08x\n",
2057 (int) dev->next, (int) dev->init);
2058 }
2059
2060 } /* End of SK_print_dev() */
2061
2062
2063
2064 /*-
2065 * Function : SK_print_ram
2066 * Author : Patrick J.D. Weichmann
2067 * Date Created : 94/06/02
2068 *
2069 * Description : This function is used to check how are things set up
2070 * in the 16KB RAM. Also the pointers to the receive and
2071 * transmit descriptor rings and rx and tx buffers locations.
2072 * It contains a minor bug in printing, but has no effect to the values
2073 * only newlines are not correct.
2074 *
2075 * Parameters : I : struct device *dev - SK_G16 device structure
2076 * Return Value : None
2077 * Errors : None
2078 * Globals : None
2079 * Update History :
2080 * YY/MM/DD uid Description
2081 -*/
2082
2083 void SK_print_ram(struct device *dev)
/* ![[last]](../icons/n_last.png)
*/
2084 {
2085
2086 int i;
2087 struct priv *p = (struct priv *) dev->priv;
2088
2089 printk("## %s: RAM Details.\n"
2090 "## RAM at %#08x tmdhead: %#08x rmdhead: %#08x initblock: %#08x\n",
2091 SK_NAME,
2092 (unsigned int) p->ram,
2093 (unsigned int) p->tmdhead,
2094 (unsigned int) p->rmdhead,
2095 (unsigned int) &(p->ram)->ib);
2096
2097 printk("## ");
2098
2099 for(i = 0; i < TMDNUM; i++)
2100 {
2101 if (!(i % 3)) /* Every third line do a newline */
2102 {
2103 printk("\n## ");
2104 }
2105 printk("tmdbufs%d: %#08x ", (i+1), (int) p->tmdbufs[i]);
2106 }
2107 printk("## ");
2108
2109 for(i = 0; i < RMDNUM; i++)
2110 {
2111 if (!(i % 3)) /* Every third line do a newline */
2112 {
2113 printk("\n## ");
2114 }
2115 printk("rmdbufs%d: %#08x ", (i+1), (int) p->rmdbufs[i]);
2116 }
2117 printk("\n");
2118
2119 } /* End of SK_print_ram() */
2120
![[bottom]](../icons/n_bottom.png){kind=icon}
*/