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Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jikos/hid
[deliverable/linux.git] / drivers / scsi / mac_scsi.c
CommitLineData
1da177e4
LT		 1/*
2 * Generic Macintosh NCR5380 driver
3 *
4 * Copyright 1998, Michael Schmitz <mschmitz@lbl.gov>
5 *
6 * derived in part from:
7 */
8/*
9 * Generic Generic NCR5380 driver
10 *
11 * Copyright 1995, Russell King
12 *
13 * ALPHA RELEASE 1.
14 *
15 * For more information, please consult
16 *
17 * NCR 5380 Family
18 * SCSI Protocol Controller
19 * Databook
20 *
21 * NCR Microelectronics
22 * 1635 Aeroplaza Drive
23 * Colorado Springs, CO 80916
24 * 1+ (719) 578-3400
25 * 1+ (800) 334-5454
26 */
27
28/*
29 * $Log: mac_NCR5380.c,v $
30 */
31
32#include <linux/types.h>
33#include <linux/stddef.h>
34#include <linux/ctype.h>
35#include <linux/delay.h>
36
37#include <linux/module.h>
38#include <linux/signal.h>
39#include <linux/sched.h>
40#include <linux/ioport.h>
41#include <linux/init.h>
42#include <linux/blkdev.h>
43#include <linux/interrupt.h>
44
45#include <asm/io.h>
46#include <asm/irq.h>
47#include <asm/system.h>
48
49#include <asm/macintosh.h>
50#include <asm/macints.h>
51#include <asm/machw.h>
52#include <asm/mac_via.h>
53
54#include "scsi.h"
55#include <scsi/scsi_host.h>
56#include "mac_scsi.h"
57#include "NCR5380.h"
58
59#if 0
60#define NDEBUG (NDEBUG_INTR | NDEBUG_PSEUDO_DMA | NDEBUG_ARBITRATION | NDEBUG_SELECTION | NDEBUG_RESELECTION)
61#else
62#define NDEBUG (NDEBUG_ABORT)
63#endif
64
65#define RESET_BOOT
66#define DRIVER_SETUP
67
1da177e4
LT		 68extern void via_scsi_clear(void);
69
70#ifdef RESET_BOOT
71static void mac_scsi_reset_boot(struct Scsi_Host *instance);
72#endif
73
74static int setup_called = 0;
75static int setup_can_queue = -1;
76static int setup_cmd_per_lun = -1;
77static int setup_sg_tablesize = -1;
78static int setup_use_pdma = -1;
79#ifdef SUPPORT_TAGS
80static int setup_use_tagged_queuing = -1;
81#endif
82static int setup_hostid = -1;
83
84/* Time (in jiffies) to wait after a reset; the SCSI standard calls for 250ms,
85 * we usually do 0.5s to be on the safe side. But Toshiba CD-ROMs once more
86 * need ten times the standard value... */
87#define TOSHIBA_DELAY
88
89#ifdef TOSHIBA_DELAY
90#define AFTER_RESET_DELAY (5*HZ/2)
91#else
92#define AFTER_RESET_DELAY (HZ/2)
93#endif
94
95static volatile unsigned char *mac_scsi_regp = NULL;
96static volatile unsigned char *mac_scsi_drq = NULL;
97static volatile unsigned char *mac_scsi_nodrq = NULL;
98
99
100/*
101 * NCR 5380 register access functions
102 */
103
104#if 0
105/* Debug versions */
106#define CTRL(p,v) (*ctrl = (v))
107
108static char macscsi_read(struct Scsi_Host *instance, int reg)
109{
110 int iobase = instance->io_port;
111 int i;
112 int *ctrl = &((struct NCR5380_hostdata *)instance->hostdata)->ctrl;
113
114 CTRL(iobase, 0);
115 i = in_8(iobase + (reg<<4));
116 CTRL(iobase, 0x40);
117
118 return i;
119}
120
121static void macscsi_write(struct Scsi_Host *instance, int reg, int value)
122{
123 int iobase = instance->io_port;
124 int *ctrl = &((struct NCR5380_hostdata *)instance->hostdata)->ctrl;
125
126 CTRL(iobase, 0);
127 out_8(iobase + (reg<<4), value);
128 CTRL(iobase, 0x40);
129}
130#else
131
132/* Fast versions */
133static __inline__ char macscsi_read(struct Scsi_Host *instance, int reg)
134{
135 return in_8(instance->io_port + (reg<<4));
136}
137
138static __inline__ void macscsi_write(struct Scsi_Host *instance, int reg, int value)
139{
140 out_8(instance->io_port + (reg<<4), value);
141}
142#endif
143
144
145/*
146 * Function : mac_scsi_setup(char *str)
147 *
148 * Purpose : booter command line initialization of the overrides array,
149 *
150 * Inputs : str - comma delimited list of options
151 *
152 */
153
154static int __init mac_scsi_setup(char *str) {
155#ifdef DRIVER_SETUP
156 int ints[7];
157
158 (void)get_options( str, ARRAY_SIZE(ints), ints);
159
160 if (setup_called++ || ints[0] < 1 || ints[0] > 6) {
161 printk(KERN_WARNING "scsi: <mac5380>"
162 " Usage: mac5380=<can_queue>[,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>,<use_pdma>]\n");
163 printk(KERN_ALERT "scsi: <mac5380> Bad Penguin parameters?\n");
164 return 0;
165 }
166
167 if (ints[0] >= 1) {
168 if (ints[1] > 0)
169 /* no limits on this, just > 0 */
170 setup_can_queue = ints[1];
171 }
172 if (ints[0] >= 2) {
173 if (ints[2] > 0)
174 setup_cmd_per_lun = ints[2];
175 }
176 if (ints[0] >= 3) {
177 if (ints[3] >= 0) {
178 setup_sg_tablesize = ints[3];
179 /* Must be <= SG_ALL (255) */
180 if (setup_sg_tablesize > SG_ALL)
181 setup_sg_tablesize = SG_ALL;
182 }
183 }
184 if (ints[0] >= 4) {
185 /* Must be between 0 and 7 */
186 if (ints[4] >= 0 && ints[4] <= 7)
187 setup_hostid = ints[4];
188 else if (ints[4] > 7)
189 printk(KERN_WARNING "mac_scsi_setup: invalid host ID %d !\n", ints[4] );
190 }
191#ifdef SUPPORT_TAGS
192 if (ints[0] >= 5) {
193 if (ints[5] >= 0)
194 setup_use_tagged_queuing = !!ints[5];
195 }
196
197 if (ints[0] == 6) {
198 if (ints[6] >= 0)
199 setup_use_pdma = ints[6];
200 }
201#else
202 if (ints[0] == 5) {
203 if (ints[5] >= 0)
204 setup_use_pdma = ints[5];
205 }
206#endif /* SUPPORT_TAGS */
207
208#endif /* DRIVER_SETUP */
209 return 1;
210}
211
212__setup("mac5380=", mac_scsi_setup);
213
214/*
215 * If you want to find the instance with (k)gdb ...
216 */
217#if NDEBUG
218static struct Scsi_Host *default_instance;
219#endif
220
221/*
d0be4a7d 222 * Function : int macscsi_detect(struct scsi_host_template * tpnt)
1da177e4
LT		 223 *
224 * Purpose : initializes mac NCR5380 driver based on the
225 * command line / compile time port and irq definitions.
226 *
227 * Inputs : tpnt - template for this SCSI adapter.
228 *
229 * Returns : 1 if a host adapter was found, 0 if not.
230 *
231 */
232
d0be4a7d 233int macscsi_detect(struct scsi_host_template * tpnt)
1da177e4
LT		 234{
235 static int called = 0;
236 int flags = 0;
237 struct Scsi_Host *instance;
238
239 if (!MACH_IS_MAC || called)
240 return( 0 );
241
242 if (macintosh_config->scsi_type != MAC_SCSI_OLD)
243 return( 0 );
244
245 /* setup variables */
246 tpnt->can_queue =
247 (setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE;
248 tpnt->cmd_per_lun =
249 (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN;
250 tpnt->sg_tablesize =
251 (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE;
252
253 if (setup_hostid >= 0)
254 tpnt->this_id = setup_hostid;
255 else {
256 /* use 7 as default */
257 tpnt->this_id = 7;
258 }
259
260#ifdef SUPPORT_TAGS
261 if (setup_use_tagged_queuing < 0)
262 setup_use_tagged_queuing = USE_TAGGED_QUEUING;
263#endif
264
265 /* Once we support multiple 5380s (e.g. DuoDock) we'll do
266 something different here */
267 instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
268#if NDEBUG
269 default_instance = instance;
270#endif
271
272 if (macintosh_config->ident == MAC_MODEL_IIFX) {
273 mac_scsi_regp = via1+0x8000;
274 mac_scsi_drq = via1+0xE000;
275 mac_scsi_nodrq = via1+0xC000;
276 /* The IIFX should be able to do true DMA, but pseudo-dma doesn't work */
277 flags = FLAG_NO_PSEUDO_DMA;
278 } else {
279 mac_scsi_regp = via1+0x10000;
280 mac_scsi_drq = via1+0x6000;
281 mac_scsi_nodrq = via1+0x12000;
282 }
283
284 if (! setup_use_pdma)
285 flags = FLAG_NO_PSEUDO_DMA;
286
287 instance->io_port = (unsigned long) mac_scsi_regp;
288 instance->irq = IRQ_MAC_SCSI;
289
290#ifdef RESET_BOOT
291 mac_scsi_reset_boot(instance);
292#endif
293
294 NCR5380_init(instance, flags);
295
296 instance->n_io_port = 255;
297
298 ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;
299
300 if (instance->irq != SCSI_IRQ_NONE)
301 if (request_irq(instance->irq, NCR5380_intr, IRQ_FLG_SLOW,
302 "ncr5380", instance)) {
303 printk(KERN_WARNING "scsi%d: IRQ%d not free, interrupts disabled\n",
304 instance->host_no, instance->irq);
305 instance->irq = SCSI_IRQ_NONE;
306 }
307
308 printk(KERN_INFO "scsi%d: generic 5380 at port %lX irq", instance->host_no, instance->io_port);
309 if (instance->irq == SCSI_IRQ_NONE)
310 printk (KERN_INFO "s disabled");
311 else
312 printk (KERN_INFO " %d", instance->irq);
313 printk(KERN_INFO " options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
314 instance->can_queue, instance->cmd_per_lun, MACSCSI_PUBLIC_RELEASE);
315 printk(KERN_INFO "\nscsi%d:", instance->host_no);
316 NCR5380_print_options(instance);
317 printk("\n");
318 called = 1;
319 return 1;
320}
321
322int macscsi_release (struct Scsi_Host *shpnt)
323{
324 if (shpnt->irq != SCSI_IRQ_NONE)
325 free_irq (shpnt->irq, NCR5380_intr);
326 NCR5380_exit(shpnt);
327
328 return 0;
329}
330
331#ifdef RESET_BOOT
332/*
333 * Our 'bus reset on boot' function
334 */
335
336static void mac_scsi_reset_boot(struct Scsi_Host *instance)
337{
338 unsigned long end;
339
340 NCR5380_local_declare();
341 NCR5380_setup(instance);
342
343 /*
344 * Do a SCSI reset to clean up the bus during initialization. No messing
345 * with the queues, interrupts, or locks necessary here.
346 */
347
348 printk(KERN_INFO "Macintosh SCSI: resetting the SCSI bus..." );
349
350 /* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */
9c5f4afd 351 disable_irq(IRQ_MAC_SCSI);
1da177e4
LT		 352
353 /* get in phase */
354 NCR5380_write( TARGET_COMMAND_REG,
355 PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
356
357 /* assert RST */
358 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
359 /* The min. reset hold time is 25us, so 40us should be enough */
360 udelay( 50 );
361 /* reset RST and interrupt */
362 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
363 NCR5380_read( RESET_PARITY_INTERRUPT_REG );
364
365 for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
366 barrier();
367
368 /* switch on SCSI IRQ again */
9c5f4afd 369 enable_irq(IRQ_MAC_SCSI);
1da177e4
LT		 370
371 printk(KERN_INFO " done\n" );
372}
373#endif
374
375const char * macscsi_info (struct Scsi_Host *spnt) {
376 return "";
377}
378
379/*
380 Pseudo-DMA: (Ove Edlund)
381 The code attempts to catch bus errors that occur if one for example
382 "trips over the cable".
383 XXX: Since bus errors in the PDMA routines never happen on my
384 computer, the bus error code is untested.
385 If the code works as intended, a bus error results in Pseudo-DMA
386 beeing disabled, meaning that the driver switches to slow handshake.
387 If bus errors are NOT extremely rare, this has to be changed.
388*/
389
390#define CP_IO_TO_MEM(s,d,len) \
391__asm__ __volatile__ \
392 (" cmp.w #4,%2\n" \
393 " bls 8f\n" \
394 " move.w %1,%%d0\n" \
395 " neg.b %%d0\n" \
396 " and.w #3,%%d0\n" \
397 " sub.w %%d0,%2\n" \
398 " bra 2f\n" \
399 " 1: move.b (%0),(%1)+\n" \
400 " 2: dbf %%d0,1b\n" \
401 " move.w %2,%%d0\n" \
402 " lsr.w #5,%%d0\n" \
403 " bra 4f\n" \
404 " 3: move.l (%0),(%1)+\n" \
405 "31: move.l (%0),(%1)+\n" \
406 "32: move.l (%0),(%1)+\n" \
407 "33: move.l (%0),(%1)+\n" \
408 "34: move.l (%0),(%1)+\n" \
409 "35: move.l (%0),(%1)+\n" \
410 "36: move.l (%0),(%1)+\n" \
411 "37: move.l (%0),(%1)+\n" \
412 " 4: dbf %%d0,3b\n" \
413 " move.w %2,%%d0\n" \
414 " lsr.w #2,%%d0\n" \
415 " and.w #7,%%d0\n" \
416 " bra 6f\n" \
417 " 5: move.l (%0),(%1)+\n" \
418 " 6: dbf %%d0,5b\n" \
419 " and.w #3,%2\n" \
420 " bra 8f\n" \
421 " 7: move.b (%0),(%1)+\n" \
422 " 8: dbf %2,7b\n" \
423 " moveq.l #0, %2\n" \
424 " 9: \n" \
425 ".section .fixup,\"ax\"\n" \
426 " .even\n" \
427 "90: moveq.l #1, %2\n" \
428 " jra 9b\n" \
429 ".previous\n" \
430 ".section __ex_table,\"a\"\n" \
431 " .align 4\n" \
432 " .long 1b,90b\n" \
433 " .long 3b,90b\n" \
434 " .long 31b,90b\n" \
435 " .long 32b,90b\n" \
436 " .long 33b,90b\n" \
437 " .long 34b,90b\n" \
438 " .long 35b,90b\n" \
439 " .long 36b,90b\n" \
440 " .long 37b,90b\n" \
441 " .long 5b,90b\n" \
442 " .long 7b,90b\n" \
443 ".previous" \
444 : "=a"(s), "=a"(d), "=d"(len) \
445 : "0"(s), "1"(d), "2"(len) \
446 : "d0")
447
448
449static int macscsi_pread (struct Scsi_Host *instance,
450 unsigned char *dst, int len)
451{
452 unsigned char *d;
453 volatile unsigned char *s;
454
455 NCR5380_local_declare();
456 NCR5380_setup(instance);
457
458 s = mac_scsi_drq+0x60;
459 d = dst;
460
461/* These conditions are derived from MacOS */
462
463 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
464 && !(NCR5380_read(STATUS_REG) & SR_REQ))
465 ;
466 if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
467 && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)) {
468 printk(KERN_ERR "Error in macscsi_pread\n");
469 return -1;
470 }
471
472 CP_IO_TO_MEM(s, d, len);
473
474 if (len != 0) {
475 printk(KERN_NOTICE "Bus error in macscsi_pread\n");
476 return -1;
477 }
478
479 return 0;
480}
481
482
483#define CP_MEM_TO_IO(s,d,len) \
484__asm__ __volatile__ \
485 (" cmp.w #4,%2\n" \
486 " bls 8f\n" \
487 " move.w %0,%%d0\n" \
488 " neg.b %%d0\n" \
489 " and.w #3,%%d0\n" \
490 " sub.w %%d0,%2\n" \
491 " bra 2f\n" \
492 " 1: move.b (%0)+,(%1)\n" \
493 " 2: dbf %%d0,1b\n" \
494 " move.w %2,%%d0\n" \
495 " lsr.w #5,%%d0\n" \
496 " bra 4f\n" \
497 " 3: move.l (%0)+,(%1)\n" \
498 "31: move.l (%0)+,(%1)\n" \
499 "32: move.l (%0)+,(%1)\n" \
500 "33: move.l (%0)+,(%1)\n" \
501 "34: move.l (%0)+,(%1)\n" \
502 "35: move.l (%0)+,(%1)\n" \
503 "36: move.l (%0)+,(%1)\n" \
504 "37: move.l (%0)+,(%1)\n" \
505 " 4: dbf %%d0,3b\n" \
506 " move.w %2,%%d0\n" \
507 " lsr.w #2,%%d0\n" \
508 " and.w #7,%%d0\n" \
509 " bra 6f\n" \
510 " 5: move.l (%0)+,(%1)\n" \
511 " 6: dbf %%d0,5b\n" \
512 " and.w #3,%2\n" \
513 " bra 8f\n" \
514 " 7: move.b (%0)+,(%1)\n" \
515 " 8: dbf %2,7b\n" \
516 " moveq.l #0, %2\n" \
517 " 9: \n" \
518 ".section .fixup,\"ax\"\n" \
519 " .even\n" \
520 "90: moveq.l #1, %2\n" \
521 " jra 9b\n" \
522 ".previous\n" \
523 ".section __ex_table,\"a\"\n" \
524 " .align 4\n" \
525 " .long 1b,90b\n" \
526 " .long 3b,90b\n" \
527 " .long 31b,90b\n" \
528 " .long 32b,90b\n" \
529 " .long 33b,90b\n" \
530 " .long 34b,90b\n" \
531 " .long 35b,90b\n" \
532 " .long 36b,90b\n" \
533 " .long 37b,90b\n" \
534 " .long 5b,90b\n" \
535 " .long 7b,90b\n" \
536 ".previous" \
537 : "=a"(s), "=a"(d), "=d"(len) \
538 : "0"(s), "1"(d), "2"(len) \
539 : "d0")
540
541static int macscsi_pwrite (struct Scsi_Host *instance,
542 unsigned char *src, int len)
543{
544 unsigned char *s;
545 volatile unsigned char *d;
546
547 NCR5380_local_declare();
548 NCR5380_setup(instance);
549
550 s = src;
551 d = mac_scsi_drq;
552
553/* These conditions are derived from MacOS */
554
555 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
556 && (!(NCR5380_read(STATUS_REG) & SR_REQ)
557 || (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)))
558 ;
559 if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)) {
560 printk(KERN_ERR "Error in macscsi_pwrite\n");
561 return -1;
562 }
563
564 CP_MEM_TO_IO(s, d, len);
565
566 if (len != 0) {
567 printk(KERN_NOTICE "Bus error in macscsi_pwrite\n");
568 return -1;
569 }
570
571 return 0;
572}
573
574
575/* These control the behaviour of the generic 5380 core */
576#define AUTOSENSE
577#define PSEUDO_DMA
578
579#include "NCR5380.c"
580
d0be4a7d 581static struct scsi_host_template driver_template = {
1da177e4
LT		 582 .proc_name = "Mac5380",
583 .proc_info = macscsi_proc_info,
584 .name = "Macintosh NCR5380 SCSI",
585 .detect = macscsi_detect,
586 .release = macscsi_release,
587 .info = macscsi_info,
588 .queuecommand = macscsi_queue_command,
589 .eh_abort_handler = macscsi_abort,
590 .eh_bus_reset_handler = macscsi_bus_reset,
1da177e4
LT		 591 .can_queue = CAN_QUEUE,
592 .this_id = 7,
593 .sg_tablesize = SG_ALL,
594 .cmd_per_lun = CMD_PER_LUN,
595 .unchecked_isa_dma = 0,
596 .use_clustering = DISABLE_CLUSTERING
597};
598
599
600#include "scsi_module.c"
Linux kernel - Deliverables
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