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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / drivers / scsi / NCR53c406a.c
blob6961f78742aedbc86de34d810891737eeece4ec9
1 /*
2 * NCR53c406.c
3 * Low-level SCSI driver for NCR53c406a chip.
4 * Copyright (C) 1994, 1995, 1996 Normunds Saumanis (normunds@fi.ibm.com)
5 *
6 * LILO command line usage: ncr53c406a=<PORTBASE>[,<IRQ>[,<FASTPIO>]]
7 * Specify IRQ = 0 for non-interrupt driven mode.
8 * FASTPIO = 1 for fast pio mode, 0 for slow mode.
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2, or (at your option) any
13 * later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 */
21
22 #define NCR53C406A_DEBUG 0
23 #define VERBOSE_NCR53C406A_DEBUG 0
24
25 /* Set this to 1 for PIO mode (recommended) or to 0 for DMA mode */
26 #define USE_PIO 1
27
28 #define USE_BIOS 0
29 /* #define BIOS_ADDR 0xD8000 *//* define this if autoprobe fails */
30 /* #define PORT_BASE 0x330 *//* define this if autoprobe fails */
31 /* #define IRQ_LEV 0 *//* define this if autoprobe fails */
32 #define DMA_CHAN 5 /* this is ignored if DMA is disabled */
33
34 /* Set this to 0 if you encounter kernel lockups while transferring
35 * data in PIO mode */
36 #define USE_FAST_PIO 1
37
38 /* ============= End of user configurable parameters ============= */
39
40 #include <linux/module.h>
41
42 #include <linux/errno.h>
43 #include <linux/ioport.h>
44 #include <linux/interrupt.h>
45 #include <linux/proc_fs.h>
46 #include <linux/stat.h>
47 #include <linux/init.h>
48 #include <linux/bitops.h>
49 #include <asm/io.h>
50 #include <asm/dma.h>
51 #include <asm/irq.h>
52
53 #include <linux/blkdev.h>
54 #include <linux/spinlock.h>
55 #include "scsi.h"
56 #include <scsi/scsi_host.h>
57
58 /* ============================================================= */
59
60 #define WATCHDOG 5000000
61
62 #define SYNC_MODE 0 /* Synchronous transfer mode */
63
64 #ifdef DEBUG
65 #undef NCR53C406A_DEBUG
66 #define NCR53C406A_DEBUG 1
67 #endif
68
69 #if USE_PIO
70 #define USE_DMA 0
71 #else
72 #define USE_DMA 1
73 #endif
74
75 /* Default configuration */
76 #define C1_IMG 0x07 /* ID=7 */
77 #define C2_IMG 0x48 /* FE SCSI2 */
78 #if USE_DMA
79 #define C3_IMG 0x21 /* CDB TE */
80 #else
81 #define C3_IMG 0x20 /* CDB */
82 #endif
83 #define C4_IMG 0x04 /* ANE */
84 #define C5_IMG 0xb6 /* AA PI SIE POL */
85
86 #define REG0 (outb(C4_IMG, CONFIG4))
87 #define REG1 (outb(C5_IMG, CONFIG5))
88
89 #if NCR53C406A_DEBUG
90 #define DEB(x) x
91 #else
92 #define DEB(x)
93 #endif
94
95 #if VERBOSE_NCR53C406A_DEBUG
96 #define VDEB(x) x
97 #else
98 #define VDEB(x)
99 #endif
100
101 #define LOAD_DMA_COUNT(count) \
102 outb(count & 0xff, TC_LSB); \
103 outb((count >> 8) & 0xff, TC_MSB); \
104 outb((count >> 16) & 0xff, TC_HIGH);
105
106 /* Chip commands */
107 #define DMA_OP 0x80
108
109 #define SCSI_NOP 0x00
110 #define FLUSH_FIFO 0x01
111 #define CHIP_RESET 0x02
112 #define SCSI_RESET 0x03
113 #define RESELECT 0x40
114 #define SELECT_NO_ATN 0x41
115 #define SELECT_ATN 0x42
116 #define SELECT_ATN_STOP 0x43
117 #define ENABLE_SEL 0x44
118 #define DISABLE_SEL 0x45
119 #define SELECT_ATN3 0x46
120 #define RESELECT3 0x47
121 #define TRANSFER_INFO 0x10
122 #define INIT_CMD_COMPLETE 0x11
123 #define MSG_ACCEPT 0x12
124 #define TRANSFER_PAD 0x18
125 #define SET_ATN 0x1a
126 #define RESET_ATN 0x1b
127 #define SEND_MSG 0x20
128 #define SEND_STATUS 0x21
129 #define SEND_DATA 0x22
130 #define DISCONN_SEQ 0x23
131 #define TERMINATE_SEQ 0x24
132 #define TARG_CMD_COMPLETE 0x25
133 #define DISCONN 0x27
134 #define RECV_MSG 0x28
135 #define RECV_CMD 0x29
136 #define RECV_DATA 0x2a
137 #define RECV_CMD_SEQ 0x2b
138 #define TARGET_ABORT_DMA 0x04
139
140 /*----------------------------------------------------------------*/
141 /* the following will set the monitor border color (useful to find
142 where something crashed or gets stuck at */
143 /* 1 = blue
144 2 = green
145 3 = cyan
146 4 = red
147 5 = magenta
148 6 = yellow
149 7 = white
150 */
151
152 #if NCR53C406A_DEBUG
153 #define rtrc(i) {inb(0x3da);outb(0x31,0x3c0);outb((i),0x3c0);}
154 #else
155 #define rtrc(i) {}
156 #endif
157 /*----------------------------------------------------------------*/
158
159 enum Phase {
160 idle,
161 data_out,
162 data_in,
163 command_ph,
164 status_ph,
165 message_out,
166 message_in
167 };
168
169 /* Static function prototypes */
170 static void NCR53c406a_intr(void *);
171 static irqreturn_t do_NCR53c406a_intr(int, void *);
172 static void chip_init(void);
173 static void calc_port_addr(void);
174 #ifndef IRQ_LEV
175 static int irq_probe(void);
176 #endif
177
178 /* ================================================================= */
179
180 #if USE_BIOS
181 static void *bios_base;
182 #endif
183
184 #ifdef PORT_BASE
185 static int port_base = PORT_BASE;
186 #else
187 static int port_base;
188 #endif
189
190 #ifdef IRQ_LEV
191 static int irq_level = IRQ_LEV;
192 #else
193 static int irq_level = -1; /* 0 is 'no irq', so use -1 for 'uninitialized' */
194 #endif
195
196 #if USE_DMA
197 static int dma_chan;
198 #endif
199
200 #if USE_PIO
201 static int fast_pio = USE_FAST_PIO;
202 #endif
203
204 static Scsi_Cmnd *current_SC;
205 static char info_msg[256];
206
207 /* ================================================================= */
208
209 /* possible BIOS locations */
210 #if USE_BIOS
211 static void *addresses[] = {
212 (void *) 0xd8000,
213 (void *) 0xc8000
214 };
215 #define ADDRESS_COUNT ARRAY_SIZE(addresses)
216 #endif /* USE_BIOS */
217
218 /* possible i/o port addresses */
219 static unsigned short ports[] = { 0x230, 0x330, 0x280, 0x290, 0x330, 0x340, 0x300, 0x310, 0x348, 0x350 };
220 #define PORT_COUNT ARRAY_SIZE(ports)
221
222 #ifndef MODULE
223 /* possible interrupt channels */
224 static unsigned short intrs[] = { 10, 11, 12, 15 };
225 #define INTR_COUNT ARRAY_SIZE(intrs)
226 #endif /* !MODULE */
227
228 /* signatures for NCR 53c406a based controllers */
229 #if USE_BIOS
230 struct signature {
231 char *signature;
232 int sig_offset;
233 int sig_length;
234 } signatures[] __initdata = {
235 /* 1 2 3 4 5 6 */
236 /* 123456789012345678901234567890123456789012345678901234567890 */
237 {
238 "Copyright (C) Acculogic, Inc.\r\n2.8M Diskette Extension Bios ver 4.04.03 03/01/1993", 61, 82},};
239
240 #define SIGNATURE_COUNT ARRAY_SIZE(signatures)
241 #endif /* USE_BIOS */
242
243 /* ============================================================ */
244
245 /* Control Register Set 0 */
246 static int TC_LSB; /* transfer counter lsb */
247 static int TC_MSB; /* transfer counter msb */
248 static int SCSI_FIFO; /* scsi fifo register */
249 static int CMD_REG; /* command register */
250 static int STAT_REG; /* status register */
251 static int DEST_ID; /* selection/reselection bus id */
252 static int INT_REG; /* interrupt status register */
253 static int SRTIMOUT; /* select/reselect timeout reg */
254 static int SEQ_REG; /* sequence step register */
255 static int SYNCPRD; /* synchronous transfer period */
256 static int FIFO_FLAGS; /* indicates # of bytes in fifo */
257 static int SYNCOFF; /* synchronous offset register */
258 static int CONFIG1; /* configuration register */
259 static int CLKCONV; /* clock conversion reg */
260 /*static int TESTREG;*//* test mode register */
261 static int CONFIG2; /* Configuration 2 Register */
262 static int CONFIG3; /* Configuration 3 Register */
263 static int CONFIG4; /* Configuration 4 Register */
264 static int TC_HIGH; /* Transfer Counter High */
265 /*static int FIFO_BOTTOM;*//* Reserve FIFO byte register */
266
267 /* Control Register Set 1 */
268 /*static int JUMPER_SENSE;*//* Jumper sense port reg (r/w) */
269 /*static int SRAM_PTR;*//* SRAM address pointer reg (r/w) */
270 /*static int SRAM_DATA;*//* SRAM data register (r/w) */
271 static int PIO_FIFO; /* PIO FIFO registers (r/w) */
272 /*static int PIO_FIFO1;*//* */
273 /*static int PIO_FIFO2;*//* */
274 /*static int PIO_FIFO3;*//* */
275 static int PIO_STATUS; /* PIO status (r/w) */
276 /*static int ATA_CMD;*//* ATA command/status reg (r/w) */
277 /*static int ATA_ERR;*//* ATA features/error register (r/w) */
278 static int PIO_FLAG; /* PIO flag interrupt enable (r/w) */
279 static int CONFIG5; /* Configuration 5 register (r/w) */
280 /*static int SIGNATURE;*//* Signature Register (r) */
281 /*static int CONFIG6;*//* Configuration 6 register (r) */
282
283 /* ============================================================== */
284
285 #if USE_DMA
286 static __inline__ int NCR53c406a_dma_setup(unsigned char *ptr, unsigned int count, unsigned char mode)
287 {
288 unsigned limit;
289 unsigned long flags = 0;
290
291 VDEB(printk("dma: before count=%d ", count));
292 if (dma_chan <= 3) {
293 if (count > 65536)
294 count = 65536;
295 limit = 65536 - (((unsigned) ptr) & 0xFFFF);
296 } else {
297 if (count > (65536 << 1))
298 count = (65536 << 1);
299 limit = (65536 << 1) - (((unsigned) ptr) & 0x1FFFF);
300 }
301
302 if (count > limit)
303 count = limit;
304
305 VDEB(printk("after count=%d\n", count));
306 if ((count & 1) || (((unsigned) ptr) & 1))
307 panic("NCR53c406a: attempted unaligned DMA transfer\n");
308
309 flags = claim_dma_lock();
310 disable_dma(dma_chan);
311 clear_dma_ff(dma_chan);
312 set_dma_addr(dma_chan, (long) ptr);
313 set_dma_count(dma_chan, count);
314 set_dma_mode(dma_chan, mode);
315 enable_dma(dma_chan);
316 release_dma_lock(flags);
317
318 return count;
319 }
320
321 static __inline__ int NCR53c406a_dma_write(unsigned char *src, unsigned int count)
322 {
323 return NCR53c406a_dma_setup(src, count, DMA_MODE_WRITE);
324 }
325
326 static __inline__ int NCR53c406a_dma_read(unsigned char *src, unsigned int count)
327 {
328 return NCR53c406a_dma_setup(src, count, DMA_MODE_READ);
329 }
330
331 static __inline__ int NCR53c406a_dma_residual(void)
332 {
333 register int tmp;
334 unsigned long flags;
335
336 flags = claim_dma_lock();
337 clear_dma_ff(dma_chan);
338 tmp = get_dma_residue(dma_chan);
339 release_dma_lock(flags);
340
341 return tmp;
342 }
343 #endif /* USE_DMA */
344
345 #if USE_PIO
346 static __inline__ int NCR53c406a_pio_read(unsigned char *request, unsigned int reqlen)
347 {
348 int i;
349 int len; /* current scsi fifo size */
350
351 REG1;
352 while (reqlen) {
353 i = inb(PIO_STATUS);
354 /* VDEB(printk("pio_status=%x\n", i)); */
355 if (i & 0x80)
356 return 0;
357
358 switch (i & 0x1e) {
359 default:
360 case 0x10:
361 len = 0;
362 break;
363 case 0x0:
364 len = 1;
365 break;
366 case 0x8:
367 len = 42;
368 break;
369 case 0xc:
370 len = 84;
371 break;
372 case 0xe:
373 len = 128;
374 break;
375 }
376
377 if ((i & 0x40) && len == 0) { /* fifo empty and interrupt occurred */
378 return 0;
379 }
380
381 if (len) {
382 if (len > reqlen)
383 len = reqlen;
384
385 if (fast_pio && len > 3) {
386 insl(PIO_FIFO, request, len >> 2);
387 request += len & 0xfc;
388 reqlen -= len & 0xfc;
389 } else {
390 while (len--) {
391 *request++ = inb(PIO_FIFO);
392 reqlen--;
393 }
394 }
395 }
396 }
397 return 0;
398 }
399
400 static __inline__ int NCR53c406a_pio_write(unsigned char *request, unsigned int reqlen)
401 {
402 int i = 0;
403 int len; /* current scsi fifo size */
404
405 REG1;
406 while (reqlen && !(i & 0x40)) {
407 i = inb(PIO_STATUS);
408 /* VDEB(printk("pio_status=%x\n", i)); */
409 if (i & 0x80) /* error */
410 return 0;
411
412 switch (i & 0x1e) {
413 case 0x10:
414 len = 128;
415 break;
416 case 0x0:
417 len = 84;
418 break;
419 case 0x8:
420 len = 42;
421 break;
422 case 0xc:
423 len = 1;
424 break;
425 default:
426 case 0xe:
427 len = 0;
428 break;
429 }
430
431 if (len) {
432 if (len > reqlen)
433 len = reqlen;
434
435 if (fast_pio && len > 3) {
436 outsl(PIO_FIFO, request, len >> 2);
437 request += len & 0xfc;
438 reqlen -= len & 0xfc;
439 } else {
440 while (len--) {
441 outb(*request++, PIO_FIFO);
442 reqlen--;
443 }
444 }
445 }
446 }
447 return 0;
448 }
449 #endif /* USE_PIO */
450
451 static int __init NCR53c406a_detect(struct scsi_host_template * tpnt)
452 {
453 int present = 0;
454 struct Scsi_Host *shpnt = NULL;
455 #ifndef PORT_BASE
456 int i;
457 #endif
458
459 #if USE_BIOS
460 int ii, jj;
461 bios_base = 0;
462 /* look for a valid signature */
463 for (ii = 0; ii < ADDRESS_COUNT && !bios_base; ii++)
464 for (jj = 0; (jj < SIGNATURE_COUNT) && !bios_base; jj++)
465 if (!memcmp((void *) addresses[ii] + signatures[jj].sig_offset, (void *) signatures[jj].signature, (int) signatures[jj].sig_length))
466 bios_base = addresses[ii];
467
468 if (!bios_base) {
469 printk("NCR53c406a: BIOS signature not found\n");
470 return 0;
471 }
472
473 DEB(printk("NCR53c406a BIOS found at 0x%x\n", (unsigned int) bios_base);
474 );
475 #endif /* USE_BIOS */
476
477 #ifdef PORT_BASE
478 if (!request_region(port_base, 0x10, "NCR53c406a")) /* ports already snatched */
479 port_base = 0;
480
481 #else /* autodetect */
482 if (port_base) { /* LILO override */
483 if (!request_region(port_base, 0x10, "NCR53c406a"))
484 port_base = 0;
485 } else {
486 for (i = 0; i < PORT_COUNT && !port_base; i++) {
487 if (!request_region(ports[i], 0x10, "NCR53c406a")) {
488 DEB(printk("NCR53c406a: port 0x%x in use\n", ports[i]));
489 } else {
490 VDEB(printk("NCR53c406a: port 0x%x available\n", ports[i]));
491 outb(C5_IMG, ports[i] + 0x0d); /* reg set 1 */
492 if ((inb(ports[i] + 0x0e) ^ inb(ports[i] + 0x0e)) == 7 && (inb(ports[i] + 0x0e) ^ inb(ports[i] + 0x0e)) == 7 && (inb(ports[i] + 0x0e) & 0xf8) == 0x58) {
493 port_base = ports[i];
494 VDEB(printk("NCR53c406a: Sig register valid\n"));
495 VDEB(printk("port_base=0x%x\n", port_base));
496 break;
497 }
498 release_region(ports[i], 0x10);
499 }
500 }
501 }
502 #endif /* PORT_BASE */
503
504 if (!port_base) { /* no ports found */
505 printk("NCR53c406a: no available ports found\n");
506 return 0;
507 }
508
509 DEB(printk("NCR53c406a detected\n"));
510
511 calc_port_addr();
512 chip_init();
513
514 #ifndef IRQ_LEV
515 if (irq_level < 0) { /* LILO override if >= 0 */
516 irq_level = irq_probe();
517 if (irq_level < 0) { /* Trouble */
518 printk("NCR53c406a: IRQ problem, irq_level=%d, giving up\n", irq_level);
519 goto err_release;
520 }
521 }
522 #endif
523
524 DEB(printk("NCR53c406a: using port_base 0x%x\n", port_base));
525
526 present = 1;
527 tpnt->proc_name = "NCR53c406a";
528
529 shpnt = scsi_register(tpnt, 0);
530 if (!shpnt) {
531 printk("NCR53c406a: Unable to register host, giving up.\n");
532 goto err_release;
533 }
534
535 if (irq_level > 0) {
536 if (request_irq(irq_level, do_NCR53c406a_intr, 0, "NCR53c406a", shpnt)) {
537 printk("NCR53c406a: unable to allocate IRQ %d\n", irq_level);
538 goto err_free_scsi;
539 }
540 tpnt->can_queue = 1;
541 DEB(printk("NCR53c406a: allocated IRQ %d\n", irq_level));
542 } else if (irq_level == 0) {
543 tpnt->can_queue = 0;
544 DEB(printk("NCR53c406a: No interrupts detected\n"));
545 printk("NCR53c406a driver no longer supports polling interface\n");
546 printk("Please email linux-scsi@vger.kernel.org\n");
547
548 #if USE_DMA
549 printk("NCR53c406a: No interrupts found and DMA mode defined. Giving up.\n");
550 #endif /* USE_DMA */
551 goto err_free_scsi;
552 } else {
553 DEB(printk("NCR53c406a: Shouldn't get here!\n"));
554 goto err_free_scsi;
555 }
556
557 #if USE_DMA
558 dma_chan = DMA_CHAN;
559 if (request_dma(dma_chan, "NCR53c406a") != 0) {
560 printk("NCR53c406a: unable to allocate DMA channel %d\n", dma_chan);
561 goto err_free_irq;
562 }
563
564 DEB(printk("Allocated DMA channel %d\n", dma_chan));
565 #endif /* USE_DMA */
566
567 shpnt->irq = irq_level;
568 shpnt->io_port = port_base;
569 shpnt->n_io_port = 0x10;
570 #if USE_DMA
571 shpnt->dma = dma_chan;
572 #endif
573
574 #if USE_DMA
575 sprintf(info_msg, "NCR53c406a at 0x%x, IRQ %d, DMA channel %d.", port_base, irq_level, dma_chan);
576 #else
577 sprintf(info_msg, "NCR53c406a at 0x%x, IRQ %d, %s PIO mode.", port_base, irq_level, fast_pio ? "fast" : "slow");
578 #endif
579
580 return (present);
581
582 #if USE_DMA
583 err_free_irq:
584 if (irq_level)
585 free_irq(irq_level, shpnt);
586 #endif
587 err_free_scsi:
588 scsi_unregister(shpnt);
589 err_release:
590 release_region(port_base, 0x10);
591 return 0;
592 }
593
594 static int NCR53c406a_release(struct Scsi_Host *shost)
595 {
596 if (shost->irq)
597 free_irq(shost->irq, NULL);
598 #ifdef USE_DMA
599 if (shost->dma_channel != 0xff)
600 free_dma(shost->dma_channel);
601 #endif
602 if (shost->io_port && shost->n_io_port)
603 release_region(shost->io_port, shost->n_io_port);
604
605 scsi_unregister(shost);
606 return 0;
607 }
608
609 #ifndef MODULE
610 /* called from init/main.c */
611 static int __init NCR53c406a_setup(char *str)
612 {
613 static size_t setup_idx = 0;
614 size_t i;
615 int ints[4];
616
617 DEB(printk("NCR53c406a: Setup called\n");
618 );
619
620 if (setup_idx >= PORT_COUNT - 1) {
621 printk("NCR53c406a: Setup called too many times. Bad LILO params?\n");
622 return 0;
623 }
624 get_options(str, 4, ints);
625 if (ints[0] < 1 || ints[0] > 3) {
626 printk("NCR53c406a: Malformed command line\n");
627 printk("NCR53c406a: Usage: ncr53c406a=<PORTBASE>[,<IRQ>[,<FASTPIO>]]\n");
628 return 0;
629 }
630 for (i = 0; i < PORT_COUNT && !port_base; i++)
631 if (ports[i] == ints[1]) {
632 port_base = ints[1];
633 DEB(printk("NCR53c406a: Specified port_base 0x%x\n", port_base);
634 )
635 }
636 if (!port_base) {
637 printk("NCR53c406a: Invalid PORTBASE 0x%x specified\n", ints[1]);
638 return 0;
639 }
640
641 if (ints[0] > 1) {
642 if (ints[2] == 0) {
643 irq_level = 0;
644 DEB(printk("NCR53c406a: Specified irq %d\n", irq_level);
645 )
646 } else
647 for (i = 0; i < INTR_COUNT && irq_level < 0; i++)
648 if (intrs[i] == ints[2]) {
649 irq_level = ints[2];
650 DEB(printk("NCR53c406a: Specified irq %d\n", port_base);
651 )
652 }
653 if (irq_level < 0)
654 printk("NCR53c406a: Invalid IRQ %d specified\n", ints[2]);
655 }
656
657 if (ints[0] > 2)
658 fast_pio = ints[3];
659
660 DEB(printk("NCR53c406a: port_base=0x%x, irq=%d, fast_pio=%d\n", port_base, irq_level, fast_pio);)
661 return 1;
662 }
663
664 __setup("ncr53c406a=", NCR53c406a_setup);
665
666 #endif /* !MODULE */
667
668 static const char *NCR53c406a_info(struct Scsi_Host *SChost)
669 {
670 DEB(printk("NCR53c406a_info called\n"));
671 return (info_msg);
672 }
673
674 #if 0
675 static void wait_intr(void)
676 {
677 unsigned long i = jiffies + WATCHDOG;
678
679 while (time_after(i, jiffies) && !(inb(STAT_REG) & 0xe0)) { /* wait for a pseudo-interrupt */
680 cpu_relax();
681 barrier();
682 }
683
684 if (time_before_eq(i, jiffies)) { /* Timed out */
685 rtrc(0);
686 current_SC->result = DID_TIME_OUT << 16;
687 current_SC->SCp.phase = idle;
688 current_SC->scsi_done(current_SC);
689 return;
690 }
691
692 NCR53c406a_intr(NULL);
693 }
694 #endif
695
696 static int NCR53c406a_queue(Scsi_Cmnd * SCpnt, void (*done) (Scsi_Cmnd *))
697 {
698 int i;
699
700 VDEB(printk("NCR53c406a_queue called\n"));
701 DEB(printk("cmd=%02x, cmd_len=%02x, target=%02x, lun=%02x, bufflen=%d\n", SCpnt->cmnd[0], SCpnt->cmd_len, SCpnt->target, SCpnt->lun, scsi_bufflen(SCpnt)));
702
703 #if 0
704 VDEB(for (i = 0; i < SCpnt->cmd_len; i++)
705 printk("cmd[%d]=%02x ", i, SCpnt->cmnd[i]));
706 VDEB(printk("\n"));
707 #endif
708
709 current_SC = SCpnt;
710 current_SC->scsi_done = done;
711 current_SC->SCp.phase = command_ph;
712 current_SC->SCp.Status = 0;
713 current_SC->SCp.Message = 0;
714
715 /* We are locked here already by the mid layer */
716 REG0;
717 outb(scmd_id(SCpnt), DEST_ID); /* set destination */
718 outb(FLUSH_FIFO, CMD_REG); /* reset the fifos */
719
720 for (i = 0; i < SCpnt->cmd_len; i++) {
721 outb(SCpnt->cmnd[i], SCSI_FIFO);
722 }
723 outb(SELECT_NO_ATN, CMD_REG);
724
725 rtrc(1);
726 return 0;
727 }
728
729 static int NCR53c406a_host_reset(Scsi_Cmnd * SCpnt)
730 {
731 DEB(printk("NCR53c406a_reset called\n"));
732
733 spin_lock_irq(SCpnt->device->host->host_lock);
734
735 outb(C4_IMG, CONFIG4); /* Select reg set 0 */
736 outb(CHIP_RESET, CMD_REG);
737 outb(SCSI_NOP, CMD_REG); /* required after reset */
738 outb(SCSI_RESET, CMD_REG);
739 chip_init();
740
741 rtrc(2);
742
743 spin_unlock_irq(SCpnt->device->host->host_lock);
744
745 return SUCCESS;
746 }
747
748 static int NCR53c406a_biosparm(struct scsi_device *disk,
749 struct block_device *dev,
750 sector_t capacity, int *info_array)
751 {
752 int size;
753
754 DEB(printk("NCR53c406a_biosparm called\n"));
755
756 size = capacity;
757 info_array[0] = 64; /* heads */
758 info_array[1] = 32; /* sectors */
759 info_array[2] = size >> 11; /* cylinders */
760 if (info_array[2] > 1024) { /* big disk */
761 info_array[0] = 255;
762 info_array[1] = 63;
763 info_array[2] = size / (255 * 63);
764 }
765 return 0;
766 }
767
768 static irqreturn_t do_NCR53c406a_intr(int unused, void *dev_id)
769 {
770 unsigned long flags;
771 struct Scsi_Host *dev = dev_id;
772
773 spin_lock_irqsave(dev->host_lock, flags);
774 NCR53c406a_intr(dev_id);
775 spin_unlock_irqrestore(dev->host_lock, flags);
776 return IRQ_HANDLED;
777 }
778
779 static void NCR53c406a_intr(void *dev_id)
780 {
781 DEB(unsigned char fifo_size;
782 )
783 DEB(unsigned char seq_reg;
784 )
785 unsigned char status, int_reg;
786 #if USE_PIO
787 unsigned char pio_status;
788 struct scatterlist *sg;
789 int i;
790 #endif
791
792 VDEB(printk("NCR53c406a_intr called\n"));
793
794 #if USE_PIO
795 REG1;
796 pio_status = inb(PIO_STATUS);
797 #endif
798 REG0;
799 status = inb(STAT_REG);
800 DEB(seq_reg = inb(SEQ_REG));
801 int_reg = inb(INT_REG);
802 DEB(fifo_size = inb(FIFO_FLAGS) & 0x1f);
803
804 #if NCR53C406A_DEBUG
805 printk("status=%02x, seq_reg=%02x, int_reg=%02x, fifo_size=%02x", status, seq_reg, int_reg, fifo_size);
806 #if (USE_DMA)
807 printk("\n");
808 #else
809 printk(", pio=%02x\n", pio_status);
810 #endif /* USE_DMA */
811 #endif /* NCR53C406A_DEBUG */
812
813 if (int_reg & 0x80) { /* SCSI reset intr */
814 rtrc(3);
815 DEB(printk("NCR53c406a: reset intr received\n"));
816 current_SC->SCp.phase = idle;
817 current_SC->result = DID_RESET << 16;
818 current_SC->scsi_done(current_SC);
819 return;
820 }
821 #if USE_PIO
822 if (pio_status & 0x80) {
823 printk("NCR53C406A: Warning: PIO error!\n");
824 current_SC->SCp.phase = idle;
825 current_SC->result = DID_ERROR << 16;
826 current_SC->scsi_done(current_SC);
827 return;
828 }
829 #endif /* USE_PIO */
830
831 if (status & 0x20) { /* Parity error */
832 printk("NCR53c406a: Warning: parity error!\n");
833 current_SC->SCp.phase = idle;
834 current_SC->result = DID_PARITY << 16;
835 current_SC->scsi_done(current_SC);
836 return;
837 }
838
839 if (status & 0x40) { /* Gross error */
840 printk("NCR53c406a: Warning: gross error!\n");
841 current_SC->SCp.phase = idle;
842 current_SC->result = DID_ERROR << 16;
843 current_SC->scsi_done(current_SC);
844 return;
845 }
846
847 if (int_reg & 0x20) { /* Disconnect */
848 DEB(printk("NCR53c406a: disconnect intr received\n"));
849 if (current_SC->SCp.phase != message_in) { /* Unexpected disconnect */
850 current_SC->result = DID_NO_CONNECT << 16;
851 } else { /* Command complete, return status and message */
852 current_SC->result = (current_SC->SCp.Status & 0xff)
853 | ((current_SC->SCp.Message & 0xff) << 8) | (DID_OK << 16);
854 }
855
856 rtrc(0);
857 current_SC->SCp.phase = idle;
858 current_SC->scsi_done(current_SC);
859 return;
860 }
861
862 switch (status & 0x07) { /* scsi phase */
863 case 0x00: /* DATA-OUT */
864 if (int_reg & 0x10) { /* Target requesting info transfer */
865 rtrc(5);
866 current_SC->SCp.phase = data_out;
867 VDEB(printk("NCR53c406a: Data-Out phase\n"));
868 outb(FLUSH_FIFO, CMD_REG);
869 LOAD_DMA_COUNT(scsi_bufflen(current_SC)); /* Max transfer size */
870 #if USE_DMA /* No s/g support for DMA */
871 NCR53c406a_dma_write(scsi_sglist(current_SC),
872 scsdi_bufflen(current_SC));
873
874 #endif /* USE_DMA */
875 outb(TRANSFER_INFO | DMA_OP, CMD_REG);
876 #if USE_PIO
877 scsi_for_each_sg(current_SC, sg, scsi_sg_count(current_SC), i) {
878 NCR53c406a_pio_write(sg_virt(sg), sg->length);
879 }
880 REG0;
881 #endif /* USE_PIO */
882 }
883 break;
884
885 case 0x01: /* DATA-IN */
886 if (int_reg & 0x10) { /* Target requesting info transfer */
887 rtrc(6);
888 current_SC->SCp.phase = data_in;
889 VDEB(printk("NCR53c406a: Data-In phase\n"));
890 outb(FLUSH_FIFO, CMD_REG);
891 LOAD_DMA_COUNT(scsi_bufflen(current_SC)); /* Max transfer size */
892 #if USE_DMA /* No s/g support for DMA */
893 NCR53c406a_dma_read(scsi_sglist(current_SC),
894 scsdi_bufflen(current_SC));
895 #endif /* USE_DMA */
896 outb(TRANSFER_INFO | DMA_OP, CMD_REG);
897 #if USE_PIO
898 scsi_for_each_sg(current_SC, sg, scsi_sg_count(current_SC), i) {
899 NCR53c406a_pio_read(sg_virt(sg), sg->length);
900 }
901 REG0;
902 #endif /* USE_PIO */
903 }
904 break;
905
906 case 0x02: /* COMMAND */
907 current_SC->SCp.phase = command_ph;
908 printk("NCR53c406a: Warning: Unknown interrupt occurred in command phase!\n");
909 break;
910
911 case 0x03: /* STATUS */
912 rtrc(7);
913 current_SC->SCp.phase = status_ph;
914 VDEB(printk("NCR53c406a: Status phase\n"));
915 outb(FLUSH_FIFO, CMD_REG);
916 outb(INIT_CMD_COMPLETE, CMD_REG);
917 break;
918
919 case 0x04: /* Reserved */
920 case 0x05: /* Reserved */
921 printk("NCR53c406a: WARNING: Reserved phase!!!\n");
922 break;
923
924 case 0x06: /* MESSAGE-OUT */
925 DEB(printk("NCR53c406a: Message-Out phase\n"));
926 current_SC->SCp.phase = message_out;
927 outb(SET_ATN, CMD_REG); /* Reject the message */
928 outb(MSG_ACCEPT, CMD_REG);
929 break;
930
931 case 0x07: /* MESSAGE-IN */
932 rtrc(4);
933 VDEB(printk("NCR53c406a: Message-In phase\n"));
934 current_SC->SCp.phase = message_in;
935
936 current_SC->SCp.Status = inb(SCSI_FIFO);
937 current_SC->SCp.Message = inb(SCSI_FIFO);
938
939 VDEB(printk("SCSI FIFO size=%d\n", inb(FIFO_FLAGS) & 0x1f));
940 DEB(printk("Status = %02x Message = %02x\n", current_SC->SCp.Status, current_SC->SCp.Message));
941
942 if (current_SC->SCp.Message == SAVE_POINTERS || current_SC->SCp.Message == DISCONNECT) {
943 outb(SET_ATN, CMD_REG); /* Reject message */
944 DEB(printk("Discarding SAVE_POINTERS message\n"));
945 }
946 outb(MSG_ACCEPT, CMD_REG);
947 break;
948 }
949 }
950
951 #ifndef IRQ_LEV
952 static int irq_probe(void)
953 {
954 int irqs, irq;
955 unsigned long i;
956
957 inb(INT_REG); /* clear the interrupt register */
958 irqs = probe_irq_on();
959
960 /* Invalid command will cause an interrupt */
961 REG0;
962 outb(0xff, CMD_REG);
963
964 /* Wait for the interrupt to occur */
965 i = jiffies + WATCHDOG;
966 while (time_after(i, jiffies) && !(inb(STAT_REG) & 0x80))
967 barrier();
968 if (time_before_eq(i, jiffies)) { /* Timed out, must be hardware trouble */
969 probe_irq_off(irqs);
970 return -1;
971 }
972
973 irq = probe_irq_off(irqs);
974
975 /* Kick the chip */
976 outb(CHIP_RESET, CMD_REG);
977 outb(SCSI_NOP, CMD_REG);
978 chip_init();
979
980 return irq;
981 }
982 #endif /* IRQ_LEV */
983
984 static void chip_init(void)
985 {
986 REG1;
987 #if USE_DMA
988 outb(0x00, PIO_STATUS);
989 #else /* USE_PIO */
990 outb(0x01, PIO_STATUS);
991 #endif
992 outb(0x00, PIO_FLAG);
993
994 outb(C4_IMG, CONFIG4); /* REG0; */
995 outb(C3_IMG, CONFIG3);
996 outb(C2_IMG, CONFIG2);
997 outb(C1_IMG, CONFIG1);
998
999 outb(0x05, CLKCONV); /* clock conversion factor */
1000 outb(0x9C, SRTIMOUT); /* Selection timeout */
1001 outb(0x05, SYNCPRD); /* Synchronous transfer period */
1002 outb(SYNC_MODE, SYNCOFF); /* synchronous mode */
1003 }
1004
1005 static void __init calc_port_addr(void)
1006 {
1007 /* Control Register Set 0 */
1008 TC_LSB = (port_base + 0x00);
1009 TC_MSB = (port_base + 0x01);
1010 SCSI_FIFO = (port_base + 0x02);
1011 CMD_REG = (port_base + 0x03);
1012 STAT_REG = (port_base + 0x04);
1013 DEST_ID = (port_base + 0x04);
1014 INT_REG = (port_base + 0x05);
1015 SRTIMOUT = (port_base + 0x05);
1016 SEQ_REG = (port_base + 0x06);
1017 SYNCPRD = (port_base + 0x06);
1018 FIFO_FLAGS = (port_base + 0x07);
1019 SYNCOFF = (port_base + 0x07);
1020 CONFIG1 = (port_base + 0x08);
1021 CLKCONV = (port_base + 0x09);
1022 /* TESTREG = (port_base+0x0A); */
1023 CONFIG2 = (port_base + 0x0B);
1024 CONFIG3 = (port_base + 0x0C);
1025 CONFIG4 = (port_base + 0x0D);
1026 TC_HIGH = (port_base + 0x0E);
1027 /* FIFO_BOTTOM = (port_base+0x0F); */
1028
1029 /* Control Register Set 1 */
1030 /* JUMPER_SENSE = (port_base+0x00); */
1031 /* SRAM_PTR = (port_base+0x01); */
1032 /* SRAM_DATA = (port_base+0x02); */
1033 PIO_FIFO = (port_base + 0x04);
1034 /* PIO_FIFO1 = (port_base+0x05); */
1035 /* PIO_FIFO2 = (port_base+0x06); */
1036 /* PIO_FIFO3 = (port_base+0x07); */
1037 PIO_STATUS = (port_base + 0x08);
1038 /* ATA_CMD = (port_base+0x09); */
1039 /* ATA_ERR = (port_base+0x0A); */
1040 PIO_FLAG = (port_base + 0x0B);
1041 CONFIG5 = (port_base + 0x0D);
1042 /* SIGNATURE = (port_base+0x0E); */
1043 /* CONFIG6 = (port_base+0x0F); */
1044 }
1045
1046 MODULE_LICENSE("GPL");
1047
1048 /* NOTE: scatter-gather support only works in PIO mode.
1049 * Use SG_NONE if DMA mode is enabled!
1050 */
1051
1052 static struct scsi_host_template driver_template =
1053 {
1054 .proc_name = "NCR53c406a" /* proc_name */,
1055 .name = "NCR53c406a" /* name */,
1056 .detect = NCR53c406a_detect /* detect */,
1057 .release = NCR53c406a_release,
1058 .info = NCR53c406a_info /* info */,
1059 .queuecommand = NCR53c406a_queue /* queuecommand */,
1060 .eh_host_reset_handler = NCR53c406a_host_reset /* reset */,
1061 .bios_param = NCR53c406a_biosparm /* biosparm */,
1062 .can_queue = 1 /* can_queue */,
1063 .this_id = 7 /* SCSI ID of the chip */,
1064 .sg_tablesize = 32 /*SG_ALL*/ /*SG_NONE*/,
1065 .cmd_per_lun = 1 /* commands per lun */,
1066 .unchecked_isa_dma = 1 /* unchecked_isa_dma */,
1067 .use_clustering = ENABLE_CLUSTERING,
1068 };
1069
1070 #include "scsi_module.c"
1071
1072 /*
1073 * Overrides for Emacs so that we get a uniform tabbing style.
1074 * Emacs will notice this stuff at the end of the file and automatically
1075 * adjust the settings for this buffer only. This must remain at the end
1076 * of the file.
1077 * ---------------------------------------------------------------------------
1078 * Local variables:
1079 * c-indent-level: 4
1080 * c-brace-imaginary-offset: 0
1081 * c-brace-offset: -4
1082 * c-argdecl-indent: 4
1083 * c-label-offset: -4
1084 * c-continued-statement-offset: 4
1085 * c-continued-brace-offset: 0
1086 * indent-tabs-mode: nil
1087 * tab-width: 8
1088 * End:
1089 */
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