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drivers/net: eliminate irq handler impossible checks, needless casts
[mirror_ubuntu-artful-kernel.git] / drivers / scsi / NCR53c406a.c
CommitLineData
1da177e4
LT		 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/sched.h>
45#include <linux/interrupt.h>
46#include <linux/proc_fs.h>
47#include <linux/stat.h>
48#include <linux/init.h>
49#include <linux/bitops.h>
50#include <asm/io.h>
51#include <asm/dma.h>
52#include <asm/irq.h>
53
54#include <linux/blkdev.h>
55#include <linux/spinlock.h>
56#include "scsi.h"
57#include <scsi/scsi_host.h>
58
59/* ============================================================= */
60
61#define WATCHDOG 5000000
62
63#define SYNC_MODE 0 /* Synchronous transfer mode */
64
147a67f0 65#ifdef DEBUG
1da177e4
LT		 66#undef NCR53C406A_DEBUG
67#define NCR53C406A_DEBUG 1
68#endif
69
70#if USE_PIO
71#define USE_DMA 0
72#else
73#define USE_DMA 1
74#endif
75
76/* Default configuration */
77#define C1_IMG 0x07 /* ID=7 */
78#define C2_IMG 0x48 /* FE SCSI2 */
79#if USE_DMA
80#define C3_IMG 0x21 /* CDB TE */
81#else
82#define C3_IMG 0x20 /* CDB */
83#endif
84#define C4_IMG 0x04 /* ANE */
85#define C5_IMG 0xb6 /* AA PI SIE POL */
86
87#define REG0 (outb(C4_IMG, CONFIG4))
88#define REG1 (outb(C5_IMG, CONFIG5))
89
90#if NCR53C406A_DEBUG
91#define DEB(x) x
92#else
93#define DEB(x)
94#endif
95
96#if VERBOSE_NCR53C406A_DEBUG
97#define VDEB(x) x
98#else
99#define VDEB(x)
100#endif
101
102#define LOAD_DMA_COUNT(count) \
103 outb(count & 0xff, TC_LSB); \
104 outb((count >> 8) & 0xff, TC_MSB); \
105 outb((count >> 16) & 0xff, TC_HIGH);
106
107/* Chip commands */
108#define DMA_OP 0x80
109
110#define SCSI_NOP 0x00
111#define FLUSH_FIFO 0x01
112#define CHIP_RESET 0x02
113#define SCSI_RESET 0x03
114#define RESELECT 0x40
115#define SELECT_NO_ATN 0x41
116#define SELECT_ATN 0x42
117#define SELECT_ATN_STOP 0x43
118#define ENABLE_SEL 0x44
119#define DISABLE_SEL 0x45
120#define SELECT_ATN3 0x46
121#define RESELECT3 0x47
122#define TRANSFER_INFO 0x10
123#define INIT_CMD_COMPLETE 0x11
124#define MSG_ACCEPT 0x12
125#define TRANSFER_PAD 0x18
126#define SET_ATN 0x1a
127#define RESET_ATN 0x1b
128#define SEND_MSG 0x20
129#define SEND_STATUS 0x21
130#define SEND_DATA 0x22
131#define DISCONN_SEQ 0x23
132#define TERMINATE_SEQ 0x24
133#define TARG_CMD_COMPLETE 0x25
134#define DISCONN 0x27
135#define RECV_MSG 0x28
136#define RECV_CMD 0x29
137#define RECV_DATA 0x2a
138#define RECV_CMD_SEQ 0x2b
139#define TARGET_ABORT_DMA 0x04
140
141/*----------------------------------------------------------------*/
142/* the following will set the monitor border color (useful to find
143 where something crashed or gets stuck at */
144/* 1 = blue
145 2 = green
146 3 = cyan
147 4 = red
148 5 = magenta
149 6 = yellow
150 7 = white
151*/
152
153#if NCR53C406A_DEBUG
154#define rtrc(i) {inb(0x3da);outb(0x31,0x3c0);outb((i),0x3c0);}
155#else
156#define rtrc(i) {}
157#endif
158/*----------------------------------------------------------------*/
159
160enum Phase {
161 idle,
162 data_out,
163 data_in,
164 command_ph,
165 status_ph,
166 message_out,
167 message_in
168};
169
170/* Static function prototypes */
7d12e780
DH		 171static void NCR53c406a_intr(int, void *);
172static irqreturn_t do_NCR53c406a_intr(int, void *);
1da177e4
LT		 173static void chip_init(void);
174static void calc_port_addr(void);
175#ifndef IRQ_LEV
176static int irq_probe(void);
177#endif
178
179/* ================================================================= */
180
181#if USE_BIOS
182static void *bios_base;
183#endif
184
44456d37 185#ifdef PORT_BASE
1da177e4
LT		 186static int port_base = PORT_BASE;
187#else
188static int port_base;
189#endif
190
44456d37 191#ifdef IRQ_LEV
1da177e4
LT		 192static int irq_level = IRQ_LEV;
193#else
194static int irq_level = -1; /* 0 is 'no irq', so use -1 for 'uninitialized' */
195#endif
196
197#if USE_DMA
198static int dma_chan;
199#endif
200
201#if USE_PIO
202static int fast_pio = USE_FAST_PIO;
203#endif
204
205static Scsi_Cmnd *current_SC;
206static char info_msg[256];
207
208/* ================================================================= */
209
210/* possible BIOS locations */
211#if USE_BIOS
212static void *addresses[] = {
213 (void *) 0xd8000,
214 (void *) 0xc8000
215};
6391a113 216#define ADDRESS_COUNT ARRAY_SIZE(addresses)
1da177e4
LT		 217#endif /* USE_BIOS */
218
219/* possible i/o port addresses */
220static unsigned short ports[] = { 0x230, 0x330, 0x280, 0x290, 0x330, 0x340, 0x300, 0x310, 0x348, 0x350 };
6391a113 221#define PORT_COUNT ARRAY_SIZE(ports)
1da177e4
LT		 222
223/* possible interrupt channels */
224static unsigned short intrs[] = { 10, 11, 12, 15 };
6391a113 225#define INTR_COUNT ARRAY_SIZE(intrs)
1da177e4
LT		 226
227/* signatures for NCR 53c406a based controllers */
228#if USE_BIOS
229struct signature {
230 char *signature;
231 int sig_offset;
232 int sig_length;
233} signatures[] __initdata = {
234 /* 1 2 3 4 5 6 */
235 /* 123456789012345678901234567890123456789012345678901234567890 */
236 {
237"Copyright (C) Acculogic, Inc.\r\n2.8M Diskette Extension Bios ver 4.04.03 03/01/1993", 61, 82},};
238
6391a113 239#define SIGNATURE_COUNT ARRAY_SIZE(signatures)
1da177e4
LT		 240#endif /* USE_BIOS */
241
242/* ============================================================ */
243
244/* Control Register Set 0 */
245static int TC_LSB; /* transfer counter lsb */
246static int TC_MSB; /* transfer counter msb */
247static int SCSI_FIFO; /* scsi fifo register */
248static int CMD_REG; /* command register */
249static int STAT_REG; /* status register */
250static int DEST_ID; /* selection/reselection bus id */
251static int INT_REG; /* interrupt status register */
252static int SRTIMOUT; /* select/reselect timeout reg */
253static int SEQ_REG; /* sequence step register */
254static int SYNCPRD; /* synchronous transfer period */
255static int FIFO_FLAGS; /* indicates # of bytes in fifo */
256static int SYNCOFF; /* synchronous offset register */
257static int CONFIG1; /* configuration register */
258static int CLKCONV; /* clock conversion reg */
259 /*static int TESTREG;*//* test mode register */
260static int CONFIG2; /* Configuration 2 Register */
261static int CONFIG3; /* Configuration 3 Register */
262static int CONFIG4; /* Configuration 4 Register */
263static int TC_HIGH; /* Transfer Counter High */
264 /*static int FIFO_BOTTOM;*//* Reserve FIFO byte register */
265
266/* Control Register Set 1 */
267 /*static int JUMPER_SENSE;*//* Jumper sense port reg (r/w) */
268 /*static int SRAM_PTR;*//* SRAM address pointer reg (r/w) */
269 /*static int SRAM_DATA;*//* SRAM data register (r/w) */
270static int PIO_FIFO; /* PIO FIFO registers (r/w) */
271 /*static int PIO_FIFO1;*//* */
272 /*static int PIO_FIFO2;*//* */
273 /*static int PIO_FIFO3;*//* */
274static int PIO_STATUS; /* PIO status (r/w) */
275 /*static int ATA_CMD;*//* ATA command/status reg (r/w) */
276 /*static int ATA_ERR;*//* ATA features/error register (r/w) */
277static int PIO_FLAG; /* PIO flag interrupt enable (r/w) */
278static int CONFIG5; /* Configuration 5 register (r/w) */
279 /*static int SIGNATURE;*//* Signature Register (r) */
280 /*static int CONFIG6;*//* Configuration 6 register (r) */
281
282/* ============================================================== */
283
284#if USE_DMA
285static __inline__ int NCR53c406a_dma_setup(unsigned char *ptr, unsigned int count, unsigned char mode)
286{
287 unsigned limit;
288 unsigned long flags = 0;
289
290 VDEB(printk("dma: before count=%d ", count));
291 if (dma_chan <= 3) {
292 if (count > 65536)
293 count = 65536;
294 limit = 65536 - (((unsigned) ptr) & 0xFFFF);
295 } else {
296 if (count > (65536 << 1))
297 count = (65536 << 1);
298 limit = (65536 << 1) - (((unsigned) ptr) & 0x1FFFF);
299 }
300
301 if (count > limit)
302 count = limit;
303
304 VDEB(printk("after count=%d\n", count));
305 if ((count & 1) || (((unsigned) ptr) & 1))
306 panic("NCR53c406a: attempted unaligned DMA transfer\n");
307
308 flags = claim_dma_lock();
309 disable_dma(dma_chan);
310 clear_dma_ff(dma_chan);
311 set_dma_addr(dma_chan, (long) ptr);
312 set_dma_count(dma_chan, count);
313 set_dma_mode(dma_chan, mode);
314 enable_dma(dma_chan);
315 release_dma_lock(flags);
316
317 return count;
318}
319
320static __inline__ int NCR53c406a_dma_write(unsigned char *src, unsigned int count)
321{
322 return NCR53c406a_dma_setup(src, count, DMA_MODE_WRITE);
323}
324
325static __inline__ int NCR53c406a_dma_read(unsigned char *src, unsigned int count)
326{
327 return NCR53c406a_dma_setup(src, count, DMA_MODE_READ);
328}
329
330static __inline__ int NCR53c406a_dma_residual(void)
331{
332 register int tmp;
333 unsigned long flags;
334
335 flags = claim_dma_lock();
336 clear_dma_ff(dma_chan);
337 tmp = get_dma_residue(dma_chan);
338 release_dma_lock(flags);
339
340 return tmp;
341}
342#endif /* USE_DMA */
343
344#if USE_PIO
345static __inline__ int NCR53c406a_pio_read(unsigned char *request, unsigned int reqlen)
346{
347 int i;
348 int len; /* current scsi fifo size */
349
350 REG1;
351 while (reqlen) {
352 i = inb(PIO_STATUS);
353 /* VDEB(printk("pio_status=%x\n", i)); */
354 if (i & 0x80)
355 return 0;
356
357 switch (i & 0x1e) {
358 default:
359 case 0x10:
360 len = 0;
361 break;
362 case 0x0:
363 len = 1;
364 break;
365 case 0x8:
366 len = 42;
367 break;
368 case 0xc:
369 len = 84;
370 break;
371 case 0xe:
372 len = 128;
373 break;
374 }
375
376 if ((i & 0x40) && len == 0) { /* fifo empty and interrupt occurred */
377 return 0;
378 }
379
380 if (len) {
381 if (len > reqlen)
382 len = reqlen;
383
384 if (fast_pio && len > 3) {
385 insl(PIO_FIFO, request, len >> 2);
386 request += len & 0xfc;
387 reqlen -= len & 0xfc;
388 } else {
389 while (len--) {
390 *request++ = inb(PIO_FIFO);
391 reqlen--;
392 }
393 }
394 }
395 }
396 return 0;
397}
398
399static __inline__ int NCR53c406a_pio_write(unsigned char *request, unsigned int reqlen)
400{
401 int i = 0;
402 int len; /* current scsi fifo size */
403
404 REG1;
405 while (reqlen && !(i & 0x40)) {
406 i = inb(PIO_STATUS);
407 /* VDEB(printk("pio_status=%x\n", i)); */
408 if (i & 0x80) /* error */
409 return 0;
410
411 switch (i & 0x1e) {
412 case 0x10:
413 len = 128;
414 break;
415 case 0x0:
416 len = 84;
417 break;
418 case 0x8:
419 len = 42;
420 break;
421 case 0xc:
422 len = 1;
423 break;
424 default:
425 case 0xe:
426 len = 0;
427 break;
428 }
429
430 if (len) {
431 if (len > reqlen)
432 len = reqlen;
433
434 if (fast_pio && len > 3) {
435 outsl(PIO_FIFO, request, len >> 2);
436 request += len & 0xfc;
437 reqlen -= len & 0xfc;
438 } else {
439 while (len--) {
440 outb(*request++, PIO_FIFO);
441 reqlen--;
442 }
443 }
444 }
445 }
446 return 0;
447}
448#endif /* USE_PIO */
449
d0be4a7d 450static int __init NCR53c406a_detect(struct scsi_host_template * tpnt)
1da177e4
LT		 451{
452 int present = 0;
453 struct Scsi_Host *shpnt = NULL;
454#ifndef PORT_BASE
455 int i;
456#endif
457
458#if USE_BIOS
459 int ii, jj;
460 bios_base = 0;
461 /* look for a valid signature */
462 for (ii = 0; ii < ADDRESS_COUNT && !bios_base; ii++)
463 for (jj = 0; (jj < SIGNATURE_COUNT) && !bios_base; jj++)
464 if (!memcmp((void *) addresses[ii] + signatures[jj].sig_offset, (void *) signatures[jj].signature, (int) signatures[jj].sig_length))
465 bios_base = addresses[ii];
466
467 if (!bios_base) {
468 printk("NCR53c406a: BIOS signature not found\n");
469 return 0;
470 }
471
472 DEB(printk("NCR53c406a BIOS found at 0x%x\n", (unsigned int) bios_base);
473 );
474#endif /* USE_BIOS */
475
476#ifdef PORT_BASE
477 if (!request_region(port_base, 0x10, "NCR53c406a")) /* ports already snatched */
478 port_base = 0;
479
480#else /* autodetect */
481 if (port_base) { /* LILO override */
482 if (!request_region(port_base, 0x10, "NCR53c406a"))
483 port_base = 0;
484 } else {
485 for (i = 0; i < PORT_COUNT && !port_base; i++) {
486 if (!request_region(ports[i], 0x10, "NCR53c406a")) {
487 DEB(printk("NCR53c406a: port 0x%x in use\n", ports[i]));
488 } else {
489 VDEB(printk("NCR53c406a: port 0x%x available\n", ports[i]));
490 outb(C5_IMG, ports[i] + 0x0d); /* reg set 1 */
491 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) {
492 port_base = ports[i];
493 VDEB(printk("NCR53c406a: Sig register valid\n"));
494 VDEB(printk("port_base=0x%x\n", port_base));
495 break;
496 }
497 release_region(ports[i], 0x10);
498 }
499 }
500 }
501#endif /* PORT_BASE */
502
503 if (!port_base) { /* no ports found */
504 printk("NCR53c406a: no available ports found\n");
505 return 0;
506 }
507
508 DEB(printk("NCR53c406a detected\n"));
509
510 calc_port_addr();
511 chip_init();
512
513#ifndef IRQ_LEV
514 if (irq_level < 0) { /* LILO override if >= 0 */
515 irq_level = irq_probe();
516 if (irq_level < 0) { /* Trouble */
517 printk("NCR53c406a: IRQ problem, irq_level=%d, giving up\n", irq_level);
518 goto err_release;
519 }
520 }
521#endif
522
523 DEB(printk("NCR53c406a: using port_base 0x%x\n", port_base));
524
525 present = 1;
526 tpnt->proc_name = "NCR53c406a";
527
528 shpnt = scsi_register(tpnt, 0);
529 if (!shpnt) {
530 printk("NCR53c406a: Unable to register host, giving up.\n");
531 goto err_release;
532 }
533
534 if (irq_level > 0) {
535 if (request_irq(irq_level, do_NCR53c406a_intr, 0, "NCR53c406a", shpnt)) {
536 printk("NCR53c406a: unable to allocate IRQ %d\n", irq_level);
537 goto err_free_scsi;
538 }
539 tpnt->can_queue = 1;
540 DEB(printk("NCR53c406a: allocated IRQ %d\n", irq_level));
541 } else if (irq_level == 0) {
542 tpnt->can_queue = 0;
543 DEB(printk("NCR53c406a: No interrupts detected\n"));
544 printk("NCR53c406a driver no longer supports polling interface\n");
545 printk("Please email linux-scsi@vger.kernel.org\n");
546
547#if USE_DMA
548 printk("NCR53c406a: No interrupts found and DMA mode defined. Giving up.\n");
549#endif /* USE_DMA */
550 goto err_free_scsi;
551 } else {
552 DEB(printk("NCR53c406a: Shouldn't get here!\n"));
553 goto err_free_scsi;
554 }
555
556#if USE_DMA
557 dma_chan = DMA_CHAN;
558 if (request_dma(dma_chan, "NCR53c406a") != 0) {
559 printk("NCR53c406a: unable to allocate DMA channel %d\n", dma_chan);
560 goto err_free_irq;
561 }
562
563 DEB(printk("Allocated DMA channel %d\n", dma_chan));
564#endif /* USE_DMA */
565
566 shpnt->irq = irq_level;
567 shpnt->io_port = port_base;
568 shpnt->n_io_port = 0x10;
569#if USE_DMA
570 shpnt->dma = dma_chan;
571#endif
572
573#if USE_DMA
574 sprintf(info_msg, "NCR53c406a at 0x%x, IRQ %d, DMA channel %d.", port_base, irq_level, dma_chan);
575#else
576 sprintf(info_msg, "NCR53c406a at 0x%x, IRQ %d, %s PIO mode.", port_base, irq_level, fast_pio ? "fast" : "slow");
577#endif
578
579 return (present);
580
581#if USE_DMA
582 err_free_irq:
583 if (irq_level)
584 free_irq(irq_level, shpnt);
585#endif
586 err_free_scsi:
587 scsi_unregister(shpnt);
588 err_release:
589 release_region(port_base, 0x10);
590 return 0;
591}
592
593static int NCR53c406a_release(struct Scsi_Host *shost)
594{
595 if (shost->irq)
596 free_irq(shost->irq, NULL);
597#ifdef USE_DMA
598 if (shost->dma_channel != 0xff)
599 free_dma(shost->dma_channel);
600#endif
601 if (shost->io_port && shost->n_io_port)
602 release_region(shost->io_port, shost->n_io_port);
603
604 scsi_unregister(shost);
605 return 0;
606}
607
608/* called from init/main.c */
609static int __init NCR53c406a_setup(char *str)
610{
611 static size_t setup_idx = 0;
612 size_t i;
613 int ints[4];
614
615 DEB(printk("NCR53c406a: Setup called\n");
616 );
617
618 if (setup_idx >= PORT_COUNT - 1) {
619 printk("NCR53c406a: Setup called too many times. Bad LILO params?\n");
620 return 0;
621 }
622 get_options(str, 4, ints);
623 if (ints[0] < 1 || ints[0] > 3) {
624 printk("NCR53c406a: Malformed command line\n");
625 printk("NCR53c406a: Usage: ncr53c406a=<PORTBASE>[,<IRQ>[,<FASTPIO>]]\n");
626 return 0;
627 }
628 for (i = 0; i < PORT_COUNT && !port_base; i++)
629 if (ports[i] == ints[1]) {
630 port_base = ints[1];
631 DEB(printk("NCR53c406a: Specified port_base 0x%x\n", port_base);
632 )
633 }
634 if (!port_base) {
635 printk("NCR53c406a: Invalid PORTBASE 0x%x specified\n", ints[1]);
636 return 0;
637 }
638
639 if (ints[0] > 1) {
640 if (ints[2] == 0) {
641 irq_level = 0;
642 DEB(printk("NCR53c406a: Specified irq %d\n", irq_level);
643 )
644 } else
645 for (i = 0; i < INTR_COUNT && irq_level < 0; i++)
646 if (intrs[i] == ints[2]) {
647 irq_level = ints[2];
648 DEB(printk("NCR53c406a: Specified irq %d\n", port_base);
649 )
650 }
651 if (irq_level < 0)
652 printk("NCR53c406a: Invalid IRQ %d specified\n", ints[2]);
653 }
654
655 if (ints[0] > 2)
656 fast_pio = ints[3];
657
658 DEB(printk("NCR53c406a: port_base=0x%x, irq=%d, fast_pio=%d\n", port_base, irq_level, fast_pio);)
659 return 1;
660}
661
662__setup("ncr53c406a=", NCR53c406a_setup);
663
664static const char *NCR53c406a_info(struct Scsi_Host *SChost)
665{
666 DEB(printk("NCR53c406a_info called\n"));
667 return (info_msg);
668}
669
670#if 0
671static void wait_intr(void)
672{
673 unsigned long i = jiffies + WATCHDOG;
674
675 while (time_after(i, jiffies) && !(inb(STAT_REG) & 0xe0)) { /* wait for a pseudo-interrupt */
676 cpu_relax();
677 barrier();
678 }
679
680 if (time_before_eq(i, jiffies)) { /* Timed out */
681 rtrc(0);
682 current_SC->result = DID_TIME_OUT << 16;
683 current_SC->SCp.phase = idle;
684 current_SC->scsi_done(current_SC);
685 return;
686 }
687
688 NCR53c406a_intr(0, NULL, NULL);
689}
690#endif
691
692static int NCR53c406a_queue(Scsi_Cmnd * SCpnt, void (*done) (Scsi_Cmnd *))
693{
694 int i;
695
696 VDEB(printk("NCR53c406a_queue called\n"));
697 DEB(printk("cmd=%02x, cmd_len=%02x, target=%02x, lun=%02x, bufflen=%d\n", SCpnt->cmnd[0], SCpnt->cmd_len, SCpnt->target, SCpnt->lun, SCpnt->request_bufflen));
698
699#if 0
700 VDEB(for (i = 0; i < SCpnt->cmd_len; i++)
701 printk("cmd[%d]=%02x ", i, SCpnt->cmnd[i]));
702 VDEB(printk("\n"));
703#endif
704
705 current_SC = SCpnt;
706 current_SC->scsi_done = done;
707 current_SC->SCp.phase = command_ph;
708 current_SC->SCp.Status = 0;
709 current_SC->SCp.Message = 0;
710
711 /* We are locked here already by the mid layer */
712 REG0;
422c0d61 713 outb(scmd_id(SCpnt), DEST_ID); /* set destination */
1da177e4
LT		 714 outb(FLUSH_FIFO, CMD_REG); /* reset the fifos */
715
716 for (i = 0; i < SCpnt->cmd_len; i++) {
717 outb(SCpnt->cmnd[i], SCSI_FIFO);
718 }
719 outb(SELECT_NO_ATN, CMD_REG);
720
721 rtrc(1);
722 return 0;
723}
724
1da177e4
LT		 725static int NCR53c406a_host_reset(Scsi_Cmnd * SCpnt)
726{
727 DEB(printk("NCR53c406a_reset called\n"));
df0ae249
JG		 728
729 spin_lock_irq(SCpnt->device->host->host_lock);
730
1da177e4
LT		 731 outb(C4_IMG, CONFIG4); /* Select reg set 0 */
732 outb(CHIP_RESET, CMD_REG);
733 outb(SCSI_NOP, CMD_REG); /* required after reset */
734 outb(SCSI_RESET, CMD_REG);
735 chip_init();
736
737 rtrc(2);
df0ae249
JG		 738
739 spin_unlock_irq(SCpnt->device->host->host_lock);
740
1da177e4
LT		 741 return SUCCESS;
742}
743
1da177e4
LT		 744static int NCR53c406a_biosparm(struct scsi_device *disk,
745 struct block_device *dev,
746 sector_t capacity, int *info_array)
747{
748 int size;
749
750 DEB(printk("NCR53c406a_biosparm called\n"));
751
752 size = capacity;
753 info_array[0] = 64; /* heads */
754 info_array[1] = 32; /* sectors */
755 info_array[2] = size >> 11; /* cylinders */
756 if (info_array[2] > 1024) { /* big disk */
757 info_array[0] = 255;
758 info_array[1] = 63;
759 info_array[2] = size / (255 * 63);
760 }
761 return 0;
762}
763
7d12e780 764static irqreturn_t do_NCR53c406a_intr(int unused, void *dev_id)
1da177e4
LT		 765{
766 unsigned long flags;
767 struct Scsi_Host *dev = dev_id;
768
769 spin_lock_irqsave(dev->host_lock, flags);
7d12e780 770 NCR53c406a_intr(0, dev_id);
1da177e4
LT		 771 spin_unlock_irqrestore(dev->host_lock, flags);
772 return IRQ_HANDLED;
773}
774
7d12e780 775static void NCR53c406a_intr(int unused, void *dev_id)
1da177e4
LT		 776{
777 DEB(unsigned char fifo_size;
778 )
779 DEB(unsigned char seq_reg;
780 )
781 unsigned char status, int_reg;
782#if USE_PIO
783 unsigned char pio_status;
784 struct scatterlist *sglist;
785 unsigned int sgcount;
786#endif
787
788 VDEB(printk("NCR53c406a_intr called\n"));
789
790#if USE_PIO
791 REG1;
792 pio_status = inb(PIO_STATUS);
793#endif
794 REG0;
795 status = inb(STAT_REG);
796 DEB(seq_reg = inb(SEQ_REG));
797 int_reg = inb(INT_REG);
798 DEB(fifo_size = inb(FIFO_FLAGS) & 0x1f);
799
800#if NCR53C406A_DEBUG
801 printk("status=%02x, seq_reg=%02x, int_reg=%02x, fifo_size=%02x", status, seq_reg, int_reg, fifo_size);
802#if (USE_DMA)
803 printk("\n");
804#else
805 printk(", pio=%02x\n", pio_status);
806#endif /* USE_DMA */
807#endif /* NCR53C406A_DEBUG */
808
809 if (int_reg & 0x80) { /* SCSI reset intr */
810 rtrc(3);
811 DEB(printk("NCR53c406a: reset intr received\n"));
812 current_SC->SCp.phase = idle;
813 current_SC->result = DID_RESET << 16;
814 current_SC->scsi_done(current_SC);
815 return;
816 }
817#if USE_PIO
818 if (pio_status & 0x80) {
819 printk("NCR53C406A: Warning: PIO error!\n");
820 current_SC->SCp.phase = idle;
821 current_SC->result = DID_ERROR << 16;
822 current_SC->scsi_done(current_SC);
823 return;
824 }
825#endif /* USE_PIO */
826
827 if (status & 0x20) { /* Parity error */
828 printk("NCR53c406a: Warning: parity error!\n");
829 current_SC->SCp.phase = idle;
830 current_SC->result = DID_PARITY << 16;
831 current_SC->scsi_done(current_SC);
832 return;
833 }
834
835 if (status & 0x40) { /* Gross error */
836 printk("NCR53c406a: Warning: gross error!\n");
837 current_SC->SCp.phase = idle;
838 current_SC->result = DID_ERROR << 16;
839 current_SC->scsi_done(current_SC);
840 return;
841 }
842
843 if (int_reg & 0x20) { /* Disconnect */
844 DEB(printk("NCR53c406a: disconnect intr received\n"));
845 if (current_SC->SCp.phase != message_in) { /* Unexpected disconnect */
846 current_SC->result = DID_NO_CONNECT << 16;
847 } else { /* Command complete, return status and message */
848 current_SC->result = (current_SC->SCp.Status & 0xff)
849 | ((current_SC->SCp.Message & 0xff) << 8) | (DID_OK << 16);
850 }
851
852 rtrc(0);
853 current_SC->SCp.phase = idle;
854 current_SC->scsi_done(current_SC);
855 return;
856 }
857
858 switch (status & 0x07) { /* scsi phase */
859 case 0x00: /* DATA-OUT */
860 if (int_reg & 0x10) { /* Target requesting info transfer */
861 rtrc(5);
862 current_SC->SCp.phase = data_out;
863 VDEB(printk("NCR53c406a: Data-Out phase\n"));
864 outb(FLUSH_FIFO, CMD_REG);
865 LOAD_DMA_COUNT(current_SC->request_bufflen); /* Max transfer size */
866#if USE_DMA /* No s/g support for DMA */
867 NCR53c406a_dma_write(current_SC->request_buffer, current_SC->request_bufflen);
868#endif /* USE_DMA */
869 outb(TRANSFER_INFO | DMA_OP, CMD_REG);
870#if USE_PIO
871 if (!current_SC->use_sg) /* Don't use scatter-gather */
872 NCR53c406a_pio_write(current_SC->request_buffer, current_SC->request_bufflen);
873 else { /* use scatter-gather */
874 sgcount = current_SC->use_sg;
875 sglist = current_SC->request_buffer;
876 while (sgcount--) {
877 NCR53c406a_pio_write(page_address(sglist->page) + sglist->offset, sglist->length);
878 sglist++;
879 }
880 }
881 REG0;
882#endif /* USE_PIO */
883 }
884 break;
885
886 case 0x01: /* DATA-IN */
887 if (int_reg & 0x10) { /* Target requesting info transfer */
888 rtrc(6);
889 current_SC->SCp.phase = data_in;
890 VDEB(printk("NCR53c406a: Data-In phase\n"));
891 outb(FLUSH_FIFO, CMD_REG);
892 LOAD_DMA_COUNT(current_SC->request_bufflen); /* Max transfer size */
893#if USE_DMA /* No s/g support for DMA */
894 NCR53c406a_dma_read(current_SC->request_buffer, current_SC->request_bufflen);
895#endif /* USE_DMA */
896 outb(TRANSFER_INFO | DMA_OP, CMD_REG);
897#if USE_PIO
898 if (!current_SC->use_sg) /* Don't use scatter-gather */
899 NCR53c406a_pio_read(current_SC->request_buffer, current_SC->request_bufflen);
900 else { /* Use scatter-gather */
901 sgcount = current_SC->use_sg;
902 sglist = current_SC->request_buffer;
903 while (sgcount--) {
904 NCR53c406a_pio_read(page_address(sglist->page) + sglist->offset, sglist->length);
905 sglist++;
906 }
907 }
908 REG0;
909#endif /* USE_PIO */
910 }
911 break;
912
913 case 0x02: /* COMMAND */
914 current_SC->SCp.phase = command_ph;
915 printk("NCR53c406a: Warning: Unknown interrupt occurred in command phase!\n");
916 break;
917
918 case 0x03: /* STATUS */
919 rtrc(7);
920 current_SC->SCp.phase = status_ph;
921 VDEB(printk("NCR53c406a: Status phase\n"));
922 outb(FLUSH_FIFO, CMD_REG);
923 outb(INIT_CMD_COMPLETE, CMD_REG);
924 break;
925
926 case 0x04: /* Reserved */
927 case 0x05: /* Reserved */
928 printk("NCR53c406a: WARNING: Reserved phase!!!\n");
929 break;
930
931 case 0x06: /* MESSAGE-OUT */
932 DEB(printk("NCR53c406a: Message-Out phase\n"));
933 current_SC->SCp.phase = message_out;
934 outb(SET_ATN, CMD_REG); /* Reject the message */
935 outb(MSG_ACCEPT, CMD_REG);
936 break;
937
938 case 0x07: /* MESSAGE-IN */
939 rtrc(4);
940 VDEB(printk("NCR53c406a: Message-In phase\n"));
941 current_SC->SCp.phase = message_in;
942
943 current_SC->SCp.Status = inb(SCSI_FIFO);
944 current_SC->SCp.Message = inb(SCSI_FIFO);
945
946 VDEB(printk("SCSI FIFO size=%d\n", inb(FIFO_FLAGS) & 0x1f));
947 DEB(printk("Status = %02x Message = %02x\n", current_SC->SCp.Status, current_SC->SCp.Message));
948
949 if (current_SC->SCp.Message == SAVE_POINTERS || current_SC->SCp.Message == DISCONNECT) {
950 outb(SET_ATN, CMD_REG); /* Reject message */
951 DEB(printk("Discarding SAVE_POINTERS message\n"));
952 }
953 outb(MSG_ACCEPT, CMD_REG);
954 break;
955 }
956}
957
958#ifndef IRQ_LEV
959static int irq_probe(void)
960{
961 int irqs, irq;
962 unsigned long i;
963
964 inb(INT_REG); /* clear the interrupt register */
965 irqs = probe_irq_on();
966
967 /* Invalid command will cause an interrupt */
968 REG0;
969 outb(0xff, CMD_REG);
970
971 /* Wait for the interrupt to occur */
972 i = jiffies + WATCHDOG;
973 while (time_after(i, jiffies) && !(inb(STAT_REG) & 0x80))
974 barrier();
975 if (time_before_eq(i, jiffies)) { /* Timed out, must be hardware trouble */
976 probe_irq_off(irqs);
977 return -1;
978 }
979
980 irq = probe_irq_off(irqs);
981
982 /* Kick the chip */
983 outb(CHIP_RESET, CMD_REG);
984 outb(SCSI_NOP, CMD_REG);
985 chip_init();
986
987 return irq;
988}
989#endif /* IRQ_LEV */
990
991static void chip_init(void)
992{
993 REG1;
994#if USE_DMA
995 outb(0x00, PIO_STATUS);
996#else /* USE_PIO */
997 outb(0x01, PIO_STATUS);
998#endif
999 outb(0x00, PIO_FLAG);
1000
1001 outb(C4_IMG, CONFIG4); /* REG0; */
1002 outb(C3_IMG, CONFIG3);
1003 outb(C2_IMG, CONFIG2);
1004 outb(C1_IMG, CONFIG1);
1005
1006 outb(0x05, CLKCONV); /* clock conversion factor */
1007 outb(0x9C, SRTIMOUT); /* Selection timeout */
1008 outb(0x05, SYNCPRD); /* Synchronous transfer period */
1009 outb(SYNC_MODE, SYNCOFF); /* synchronous mode */
1010}
1011
1012static void __init calc_port_addr(void)
1013{
1014 /* Control Register Set 0 */
1015 TC_LSB = (port_base + 0x00);
1016 TC_MSB = (port_base + 0x01);
1017 SCSI_FIFO = (port_base + 0x02);
1018 CMD_REG = (port_base + 0x03);
1019 STAT_REG = (port_base + 0x04);
1020 DEST_ID = (port_base + 0x04);
1021 INT_REG = (port_base + 0x05);
1022 SRTIMOUT = (port_base + 0x05);
1023 SEQ_REG = (port_base + 0x06);
1024 SYNCPRD = (port_base + 0x06);
1025 FIFO_FLAGS = (port_base + 0x07);
1026 SYNCOFF = (port_base + 0x07);
1027 CONFIG1 = (port_base + 0x08);
1028 CLKCONV = (port_base + 0x09);
1029 /* TESTREG = (port_base+0x0A); */
1030 CONFIG2 = (port_base + 0x0B);
1031 CONFIG3 = (port_base + 0x0C);
1032 CONFIG4 = (port_base + 0x0D);
1033 TC_HIGH = (port_base + 0x0E);
1034 /* FIFO_BOTTOM = (port_base+0x0F); */
1035
1036 /* Control Register Set 1 */
1037 /* JUMPER_SENSE = (port_base+0x00); */
1038 /* SRAM_PTR = (port_base+0x01); */
1039 /* SRAM_DATA = (port_base+0x02); */
1040 PIO_FIFO = (port_base + 0x04);
1041 /* PIO_FIFO1 = (port_base+0x05); */
1042 /* PIO_FIFO2 = (port_base+0x06); */
1043 /* PIO_FIFO3 = (port_base+0x07); */
1044 PIO_STATUS = (port_base + 0x08);
1045 /* ATA_CMD = (port_base+0x09); */
1046 /* ATA_ERR = (port_base+0x0A); */
1047 PIO_FLAG = (port_base + 0x0B);
1048 CONFIG5 = (port_base + 0x0D);
1049 /* SIGNATURE = (port_base+0x0E); */
1050 /* CONFIG6 = (port_base+0x0F); */
1051}
1052
1053MODULE_LICENSE("GPL");
1054
1055/* NOTE: scatter-gather support only works in PIO mode.
1056 * Use SG_NONE if DMA mode is enabled!
1057 */
1058
d0be4a7d 1059static struct scsi_host_template driver_template =
1da177e4
LT		 1060{
1061 .proc_name = "NCR53c406a" /* proc_name */,
1062 .name = "NCR53c406a" /* name */,
1063 .detect = NCR53c406a_detect /* detect */,
1064 .release = NCR53c406a_release,
1065 .info = NCR53c406a_info /* info */,
1066 .queuecommand = NCR53c406a_queue /* queuecommand */,
1da177e4
LT		 1067 .eh_host_reset_handler = NCR53c406a_host_reset /* reset */,
1068 .bios_param = NCR53c406a_biosparm /* biosparm */,
1069 .can_queue = 1 /* can_queue */,
1070 .this_id = 7 /* SCSI ID of the chip */,
1071 .sg_tablesize = 32 /*SG_ALL*/ /*SG_NONE*/,
1072 .cmd_per_lun = 1 /* commands per lun */,
1073 .unchecked_isa_dma = 1 /* unchecked_isa_dma */,
1074 .use_clustering = ENABLE_CLUSTERING
1075};
1076
1077#include "scsi_module.c"
1078
1079/*
1080 * Overrides for Emacs so that we get a uniform tabbing style.
1081 * Emacs will notice this stuff at the end of the file and automatically
1082 * adjust the settings for this buffer only. This must remain at the end
1083 * of the file.
1084 * ---------------------------------------------------------------------------
1085 * Local variables:
1086 * c-indent-level: 4
1087 * c-brace-imaginary-offset: 0
1088 * c-brace-offset: -4
1089 * c-argdecl-indent: 4
1090 * c-label-offset: -4
1091 * c-continued-statement-offset: 4
1092 * c-continued-brace-offset: 0
1093 * indent-tabs-mode: nil
1094 * tab-width: 8
1095 * End:
1096 */
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