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