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PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / scsi / mac_scsi.c
blobf5cdc68cd5b6f194f9f1f5e573e1c7747a70bb48
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/ioport.h>
40 #include <linux/init.h>
41 #include <linux/blkdev.h>
42 #include <linux/interrupt.h>
43
44 #include <asm/io.h>
45 #include <asm/irq.h>
46
47 #include <asm/macintosh.h>
48 #include <asm/macints.h>
49 #include <asm/mac_via.h>
50
51 #include "scsi.h"
52 #include <scsi/scsi_host.h>
53 #include "mac_scsi.h"
54
55 /* These control the behaviour of the generic 5380 core */
56 #define AUTOSENSE
57 #define PSEUDO_DMA
58
59 #include "NCR5380.h"
60
61 #if 0
62 #define NDEBUG (NDEBUG_INTR | NDEBUG_PSEUDO_DMA | NDEBUG_ARBITRATION | NDEBUG_SELECTION | NDEBUG_RESELECTION)
63 #else
64 #define NDEBUG (NDEBUG_ABORT)
65 #endif
66
67 #define RESET_BOOT
68 #define DRIVER_SETUP
69
70 extern void via_scsi_clear(void);
71
72 #ifdef RESET_BOOT
73 static void mac_scsi_reset_boot(struct Scsi_Host *instance);
74 #endif
75
76 static int setup_called = 0;
77 static int setup_can_queue = -1;
78 static int setup_cmd_per_lun = -1;
79 static int setup_sg_tablesize = -1;
80 static int setup_use_pdma = -1;
81 #ifdef SUPPORT_TAGS
82 static int setup_use_tagged_queuing = -1;
83 #endif
84 static int setup_hostid = -1;
85
86 /* Time (in jiffies) to wait after a reset; the SCSI standard calls for 250ms,
87 * we usually do 0.5s to be on the safe side. But Toshiba CD-ROMs once more
88 * need ten times the standard value... */
89 #define TOSHIBA_DELAY
90
91 #ifdef TOSHIBA_DELAY
92 #define AFTER_RESET_DELAY (5*HZ/2)
93 #else
94 #define AFTER_RESET_DELAY (HZ/2)
95 #endif
96
97 static volatile unsigned char *mac_scsi_regp = NULL;
98 static volatile unsigned char *mac_scsi_drq = NULL;
99 static volatile unsigned char *mac_scsi_nodrq = NULL;
100
101
102 /*
103 * NCR 5380 register access functions
104 */
105
106 #if 0
107 /* Debug versions */
108 #define CTRL(p,v) (*ctrl = (v))
109
110 static char macscsi_read(struct Scsi_Host *instance, int reg)
111 {
112 int iobase = instance->io_port;
113 int i;
114 int *ctrl = &((struct NCR5380_hostdata *)instance->hostdata)->ctrl;
115
116 CTRL(iobase, 0);
117 i = in_8(iobase + (reg<<4));
118 CTRL(iobase, 0x40);
119
120 return i;
121 }
122
123 static void macscsi_write(struct Scsi_Host *instance, int reg, int value)
124 {
125 int iobase = instance->io_port;
126 int *ctrl = &((struct NCR5380_hostdata *)instance->hostdata)->ctrl;
127
128 CTRL(iobase, 0);
129 out_8(iobase + (reg<<4), value);
130 CTRL(iobase, 0x40);
131 }
132 #else
133
134 /* Fast versions */
135 static __inline__ char macscsi_read(struct Scsi_Host *instance, int reg)
136 {
137 return in_8(instance->io_port + (reg<<4));
138 }
139
140 static __inline__ void macscsi_write(struct Scsi_Host *instance, int reg, int value)
141 {
142 out_8(instance->io_port + (reg<<4), value);
143 }
144 #endif
145
146
147 /*
148 * Function : mac_scsi_setup(char *str)
149 *
150 * Purpose : booter command line initialization of the overrides array,
151 *
152 * Inputs : str - comma delimited list of options
153 *
154 */
155
156 static int __init mac_scsi_setup(char *str) {
157 #ifdef DRIVER_SETUP
158 int ints[7];
159
160 (void)get_options( str, ARRAY_SIZE(ints), ints);
161
162 if (setup_called++ || ints[0] < 1 || ints[0] > 6) {
163 printk(KERN_WARNING "scsi: <mac5380>"
164 " Usage: mac5380=<can_queue>[,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>,<use_pdma>]\n");
165 printk(KERN_ALERT "scsi: <mac5380> Bad Penguin parameters?\n");
166 return 0;
167 }
168
169 if (ints[0] >= 1) {
170 if (ints[1] > 0)
171 /* no limits on this, just > 0 */
172 setup_can_queue = ints[1];
173 }
174 if (ints[0] >= 2) {
175 if (ints[2] > 0)
176 setup_cmd_per_lun = ints[2];
177 }
178 if (ints[0] >= 3) {
179 if (ints[3] >= 0) {
180 setup_sg_tablesize = ints[3];
181 /* Must be <= SG_ALL (255) */
182 if (setup_sg_tablesize > SG_ALL)
183 setup_sg_tablesize = SG_ALL;
184 }
185 }
186 if (ints[0] >= 4) {
187 /* Must be between 0 and 7 */
188 if (ints[4] >= 0 && ints[4] <= 7)
189 setup_hostid = ints[4];
190 else if (ints[4] > 7)
191 printk(KERN_WARNING "mac_scsi_setup: invalid host ID %d !\n", ints[4] );
192 }
193 #ifdef SUPPORT_TAGS
194 if (ints[0] >= 5) {
195 if (ints[5] >= 0)
196 setup_use_tagged_queuing = !!ints[5];
197 }
198
199 if (ints[0] == 6) {
200 if (ints[6] >= 0)
201 setup_use_pdma = ints[6];
202 }
203 #else
204 if (ints[0] == 5) {
205 if (ints[5] >= 0)
206 setup_use_pdma = ints[5];
207 }
208 #endif /* SUPPORT_TAGS */
209
210 #endif /* DRIVER_SETUP */
211 return 1;
212 }
213
214 __setup("mac5380=", mac_scsi_setup);
215
216 /*
217 * Function : int macscsi_detect(struct scsi_host_template * tpnt)
218 *
219 * Purpose : initializes mac NCR5380 driver based on the
220 * command line / compile time port and irq definitions.
221 *
222 * Inputs : tpnt - template for this SCSI adapter.
223 *
224 * Returns : 1 if a host adapter was found, 0 if not.
225 *
226 */
227
228 int __init macscsi_detect(struct scsi_host_template * tpnt)
229 {
230 static int called = 0;
231 int flags = 0;
232 struct Scsi_Host *instance;
233
234 if (!MACH_IS_MAC || called)
235 return( 0 );
236
237 if (macintosh_config->scsi_type != MAC_SCSI_OLD)
238 return( 0 );
239
240 /* setup variables */
241 tpnt->can_queue =
242 (setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE;
243 tpnt->cmd_per_lun =
244 (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN;
245 tpnt->sg_tablesize =
246 (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE;
247
248 if (setup_hostid >= 0)
249 tpnt->this_id = setup_hostid;
250 else {
251 /* use 7 as default */
252 tpnt->this_id = 7;
253 }
254
255 #ifdef SUPPORT_TAGS
256 if (setup_use_tagged_queuing < 0)
257 setup_use_tagged_queuing = USE_TAGGED_QUEUING;
258 #endif
259
260 /* Once we support multiple 5380s (e.g. DuoDock) we'll do
261 something different here */
262 instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
263 if (instance == NULL)
264 return 0;
265
266 if (macintosh_config->ident == MAC_MODEL_IIFX) {
267 mac_scsi_regp = via1+0x8000;
268 mac_scsi_drq = via1+0xE000;
269 mac_scsi_nodrq = via1+0xC000;
270 /* The IIFX should be able to do true DMA, but pseudo-dma doesn't work */
271 flags = FLAG_NO_PSEUDO_DMA;
272 } else {
273 mac_scsi_regp = via1+0x10000;
274 mac_scsi_drq = via1+0x6000;
275 mac_scsi_nodrq = via1+0x12000;
276 }
277
278 if (! setup_use_pdma)
279 flags = FLAG_NO_PSEUDO_DMA;
280
281 instance->io_port = (unsigned long) mac_scsi_regp;
282 instance->irq = IRQ_MAC_SCSI;
283
284 #ifdef RESET_BOOT
285 mac_scsi_reset_boot(instance);
286 #endif
287
288 NCR5380_init(instance, flags);
289
290 instance->n_io_port = 255;
291
292 ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;
293
294 if (instance->irq != SCSI_IRQ_NONE)
295 if (request_irq(instance->irq, NCR5380_intr, 0, "ncr5380", instance)) {
296 printk(KERN_WARNING "scsi%d: IRQ%d not free, interrupts disabled\n",
297 instance->host_no, instance->irq);
298 instance->irq = SCSI_IRQ_NONE;
299 }
300
301 printk(KERN_INFO "scsi%d: generic 5380 at port %lX irq", instance->host_no, instance->io_port);
302 if (instance->irq == SCSI_IRQ_NONE)
303 printk (KERN_INFO "s disabled");
304 else
305 printk (KERN_INFO " %d", instance->irq);
306 printk(KERN_INFO " options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
307 instance->can_queue, instance->cmd_per_lun, MACSCSI_PUBLIC_RELEASE);
308 printk(KERN_INFO "\nscsi%d:", instance->host_no);
309 NCR5380_print_options(instance);
310 printk("\n");
311 called = 1;
312 return 1;
313 }
314
315 int macscsi_release (struct Scsi_Host *shpnt)
316 {
317 if (shpnt->irq != SCSI_IRQ_NONE)
318 free_irq(shpnt->irq, shpnt);
319 NCR5380_exit(shpnt);
320
321 return 0;
322 }
323
324 #ifdef RESET_BOOT
325 /*
326 * Our 'bus reset on boot' function
327 */
328
329 static void mac_scsi_reset_boot(struct Scsi_Host *instance)
330 {
331 unsigned long end;
332
333 NCR5380_local_declare();
334 NCR5380_setup(instance);
335
336 /*
337 * Do a SCSI reset to clean up the bus during initialization. No messing
338 * with the queues, interrupts, or locks necessary here.
339 */
340
341 printk(KERN_INFO "Macintosh SCSI: resetting the SCSI bus..." );
342
343 /* get in phase */
344 NCR5380_write( TARGET_COMMAND_REG,
345 PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
346
347 /* assert RST */
348 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
349 /* The min. reset hold time is 25us, so 40us should be enough */
350 udelay( 50 );
351 /* reset RST and interrupt */
352 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
353 NCR5380_read( RESET_PARITY_INTERRUPT_REG );
354
355 for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
356 barrier();
357
358 printk(KERN_INFO " done\n" );
359 }
360 #endif
361
362 const char * macscsi_info (struct Scsi_Host *spnt) {
363 return "";
364 }
365
366 /*
367 Pseudo-DMA: (Ove Edlund)
368 The code attempts to catch bus errors that occur if one for example
369 "trips over the cable".
370 XXX: Since bus errors in the PDMA routines never happen on my
371 computer, the bus error code is untested.
372 If the code works as intended, a bus error results in Pseudo-DMA
373 beeing disabled, meaning that the driver switches to slow handshake.
374 If bus errors are NOT extremely rare, this has to be changed.
375 */
376
377 #define CP_IO_TO_MEM(s,d,len) \
378 __asm__ __volatile__ \
379 (" cmp.w #4,%2\n" \
380 " bls 8f\n" \
381 " move.w %1,%%d0\n" \
382 " neg.b %%d0\n" \
383 " and.w #3,%%d0\n" \
384 " sub.w %%d0,%2\n" \
385 " bra 2f\n" \
386 " 1: move.b (%0),(%1)+\n" \
387 " 2: dbf %%d0,1b\n" \
388 " move.w %2,%%d0\n" \
389 " lsr.w #5,%%d0\n" \
390 " bra 4f\n" \
391 " 3: move.l (%0),(%1)+\n" \
392 "31: move.l (%0),(%1)+\n" \
393 "32: move.l (%0),(%1)+\n" \
394 "33: move.l (%0),(%1)+\n" \
395 "34: move.l (%0),(%1)+\n" \
396 "35: move.l (%0),(%1)+\n" \
397 "36: move.l (%0),(%1)+\n" \
398 "37: move.l (%0),(%1)+\n" \
399 " 4: dbf %%d0,3b\n" \
400 " move.w %2,%%d0\n" \
401 " lsr.w #2,%%d0\n" \
402 " and.w #7,%%d0\n" \
403 " bra 6f\n" \
404 " 5: move.l (%0),(%1)+\n" \
405 " 6: dbf %%d0,5b\n" \
406 " and.w #3,%2\n" \
407 " bra 8f\n" \
408 " 7: move.b (%0),(%1)+\n" \
409 " 8: dbf %2,7b\n" \
410 " moveq.l #0, %2\n" \
411 " 9: \n" \
412 ".section .fixup,\"ax\"\n" \
413 " .even\n" \
414 "90: moveq.l #1, %2\n" \
415 " jra 9b\n" \
416 ".previous\n" \
417 ".section __ex_table,\"a\"\n" \
418 " .align 4\n" \
419 " .long 1b,90b\n" \
420 " .long 3b,90b\n" \
421 " .long 31b,90b\n" \
422 " .long 32b,90b\n" \
423 " .long 33b,90b\n" \
424 " .long 34b,90b\n" \
425 " .long 35b,90b\n" \
426 " .long 36b,90b\n" \
427 " .long 37b,90b\n" \
428 " .long 5b,90b\n" \
429 " .long 7b,90b\n" \
430 ".previous" \
431 : "=a"(s), "=a"(d), "=d"(len) \
432 : "0"(s), "1"(d), "2"(len) \
433 : "d0")
434
435
436 static int macscsi_pread (struct Scsi_Host *instance,
437 unsigned char *dst, int len)
438 {
439 unsigned char *d;
440 volatile unsigned char *s;
441
442 NCR5380_local_declare();
443 NCR5380_setup(instance);
444
445 s = mac_scsi_drq+0x60;
446 d = dst;
447
448 /* These conditions are derived from MacOS */
449
450 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
451 && !(NCR5380_read(STATUS_REG) & SR_REQ))
452 ;
453 if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
454 && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)) {
455 printk(KERN_ERR "Error in macscsi_pread\n");
456 return -1;
457 }
458
459 CP_IO_TO_MEM(s, d, len);
460
461 if (len != 0) {
462 printk(KERN_NOTICE "Bus error in macscsi_pread\n");
463 return -1;
464 }
465
466 return 0;
467 }
468
469
470 #define CP_MEM_TO_IO(s,d,len) \
471 __asm__ __volatile__ \
472 (" cmp.w #4,%2\n" \
473 " bls 8f\n" \
474 " move.w %0,%%d0\n" \
475 " neg.b %%d0\n" \
476 " and.w #3,%%d0\n" \
477 " sub.w %%d0,%2\n" \
478 " bra 2f\n" \
479 " 1: move.b (%0)+,(%1)\n" \
480 " 2: dbf %%d0,1b\n" \
481 " move.w %2,%%d0\n" \
482 " lsr.w #5,%%d0\n" \
483 " bra 4f\n" \
484 " 3: move.l (%0)+,(%1)\n" \
485 "31: move.l (%0)+,(%1)\n" \
486 "32: move.l (%0)+,(%1)\n" \
487 "33: move.l (%0)+,(%1)\n" \
488 "34: move.l (%0)+,(%1)\n" \
489 "35: move.l (%0)+,(%1)\n" \
490 "36: move.l (%0)+,(%1)\n" \
491 "37: move.l (%0)+,(%1)\n" \
492 " 4: dbf %%d0,3b\n" \
493 " move.w %2,%%d0\n" \
494 " lsr.w #2,%%d0\n" \
495 " and.w #7,%%d0\n" \
496 " bra 6f\n" \
497 " 5: move.l (%0)+,(%1)\n" \
498 " 6: dbf %%d0,5b\n" \
499 " and.w #3,%2\n" \
500 " bra 8f\n" \
501 " 7: move.b (%0)+,(%1)\n" \
502 " 8: dbf %2,7b\n" \
503 " moveq.l #0, %2\n" \
504 " 9: \n" \
505 ".section .fixup,\"ax\"\n" \
506 " .even\n" \
507 "90: moveq.l #1, %2\n" \
508 " jra 9b\n" \
509 ".previous\n" \
510 ".section __ex_table,\"a\"\n" \
511 " .align 4\n" \
512 " .long 1b,90b\n" \
513 " .long 3b,90b\n" \
514 " .long 31b,90b\n" \
515 " .long 32b,90b\n" \
516 " .long 33b,90b\n" \
517 " .long 34b,90b\n" \
518 " .long 35b,90b\n" \
519 " .long 36b,90b\n" \
520 " .long 37b,90b\n" \
521 " .long 5b,90b\n" \
522 " .long 7b,90b\n" \
523 ".previous" \
524 : "=a"(s), "=a"(d), "=d"(len) \
525 : "0"(s), "1"(d), "2"(len) \
526 : "d0")
527
528 static int macscsi_pwrite (struct Scsi_Host *instance,
529 unsigned char *src, int len)
530 {
531 unsigned char *s;
532 volatile unsigned char *d;
533
534 NCR5380_local_declare();
535 NCR5380_setup(instance);
536
537 s = src;
538 d = mac_scsi_drq;
539
540 /* These conditions are derived from MacOS */
541
542 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
543 && (!(NCR5380_read(STATUS_REG) & SR_REQ)
544 || (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)))
545 ;
546 if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)) {
547 printk(KERN_ERR "Error in macscsi_pwrite\n");
548 return -1;
549 }
550
551 CP_MEM_TO_IO(s, d, len);
552
553 if (len != 0) {
554 printk(KERN_NOTICE "Bus error in macscsi_pwrite\n");
555 return -1;
556 }
557
558 return 0;
559 }
560
561
562 #include "NCR5380.c"
563
564 static struct scsi_host_template driver_template = {
565 .proc_name = "Mac5380",
566 .show_info = macscsi_show_info,
567 .write_info = macscsi_write_info,
568 .name = "Macintosh NCR5380 SCSI",
569 .detect = macscsi_detect,
570 .release = macscsi_release,
571 .info = macscsi_info,
572 .queuecommand = macscsi_queue_command,
573 .eh_abort_handler = macscsi_abort,
574 .eh_bus_reset_handler = macscsi_bus_reset,
575 .can_queue = CAN_QUEUE,
576 .this_id = 7,
577 .sg_tablesize = SG_ALL,
578 .cmd_per_lun = CMD_PER_LUN,
579 .use_clustering = DISABLE_CLUSTERING
580 };
581
582
583 #include "scsi_module.c"
Linux with added FPC-III support