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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / drivers / scsi / mac_scsi.c
blob3b09ab21d701ba9d8726c48647cee64a85364bda
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 #include <asm/system.h>
47
48 #include <asm/macintosh.h>
49 #include <asm/macints.h>
50 #include <asm/machw.h>
51 #include <asm/mac_via.h>
52
53 #include "scsi.h"
54 #include <scsi/scsi_host.h>
55 #include "mac_scsi.h"
56
57 /* These control the behaviour of the generic 5380 core */
58 #define AUTOSENSE
59 #define PSEUDO_DMA
60
61 #include "NCR5380.h"
62
63 #if 0
64 #define NDEBUG (NDEBUG_INTR | NDEBUG_PSEUDO_DMA | NDEBUG_ARBITRATION | NDEBUG_SELECTION | NDEBUG_RESELECTION)
65 #else
66 #define NDEBUG (NDEBUG_ABORT)
67 #endif
68
69 #define RESET_BOOT
70 #define DRIVER_SETUP
71
72 extern void via_scsi_clear(void);
73
74 #ifdef RESET_BOOT
75 static void mac_scsi_reset_boot(struct Scsi_Host *instance);
76 #endif
77
78 static int setup_called = 0;
79 static int setup_can_queue = -1;
80 static int setup_cmd_per_lun = -1;
81 static int setup_sg_tablesize = -1;
82 static int setup_use_pdma = -1;
83 #ifdef SUPPORT_TAGS
84 static int setup_use_tagged_queuing = -1;
85 #endif
86 static int setup_hostid = -1;
87
88 /* Time (in jiffies) to wait after a reset; the SCSI standard calls for 250ms,
89 * we usually do 0.5s to be on the safe side. But Toshiba CD-ROMs once more
90 * need ten times the standard value... */
91 #define TOSHIBA_DELAY
92
93 #ifdef TOSHIBA_DELAY
94 #define AFTER_RESET_DELAY (5*HZ/2)
95 #else
96 #define AFTER_RESET_DELAY (HZ/2)
97 #endif
98
99 static volatile unsigned char *mac_scsi_regp = NULL;
100 static volatile unsigned char *mac_scsi_drq = NULL;
101 static volatile unsigned char *mac_scsi_nodrq = NULL;
102
103
104 /*
105 * NCR 5380 register access functions
106 */
107
108 #if 0
109 /* Debug versions */
110 #define CTRL(p,v) (*ctrl = (v))
111
112 static char macscsi_read(struct Scsi_Host *instance, int reg)
113 {
114 int iobase = instance->io_port;
115 int i;
116 int *ctrl = &((struct NCR5380_hostdata *)instance->hostdata)->ctrl;
117
118 CTRL(iobase, 0);
119 i = in_8(iobase + (reg<<4));
120 CTRL(iobase, 0x40);
121
122 return i;
123 }
124
125 static void macscsi_write(struct Scsi_Host *instance, int reg, int value)
126 {
127 int iobase = instance->io_port;
128 int *ctrl = &((struct NCR5380_hostdata *)instance->hostdata)->ctrl;
129
130 CTRL(iobase, 0);
131 out_8(iobase + (reg<<4), value);
132 CTRL(iobase, 0x40);
133 }
134 #else
135
136 /* Fast versions */
137 static __inline__ char macscsi_read(struct Scsi_Host *instance, int reg)
138 {
139 return in_8(instance->io_port + (reg<<4));
140 }
141
142 static __inline__ void macscsi_write(struct Scsi_Host *instance, int reg, int value)
143 {
144 out_8(instance->io_port + (reg<<4), value);
145 }
146 #endif
147
148
149 /*
150 * Function : mac_scsi_setup(char *str)
151 *
152 * Purpose : booter command line initialization of the overrides array,
153 *
154 * Inputs : str - comma delimited list of options
155 *
156 */
157
158 static int __init mac_scsi_setup(char *str) {
159 #ifdef DRIVER_SETUP
160 int ints[7];
161
162 (void)get_options( str, ARRAY_SIZE(ints), ints);
163
164 if (setup_called++ || ints[0] < 1 || ints[0] > 6) {
165 printk(KERN_WARNING "scsi: <mac5380>"
166 " Usage: mac5380=<can_queue>[,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>,<use_pdma>]\n");
167 printk(KERN_ALERT "scsi: <mac5380> Bad Penguin parameters?\n");
168 return 0;
169 }
170
171 if (ints[0] >= 1) {
172 if (ints[1] > 0)
173 /* no limits on this, just > 0 */
174 setup_can_queue = ints[1];
175 }
176 if (ints[0] >= 2) {
177 if (ints[2] > 0)
178 setup_cmd_per_lun = ints[2];
179 }
180 if (ints[0] >= 3) {
181 if (ints[3] >= 0) {
182 setup_sg_tablesize = ints[3];
183 /* Must be <= SG_ALL (255) */
184 if (setup_sg_tablesize > SG_ALL)
185 setup_sg_tablesize = SG_ALL;
186 }
187 }
188 if (ints[0] >= 4) {
189 /* Must be between 0 and 7 */
190 if (ints[4] >= 0 && ints[4] <= 7)
191 setup_hostid = ints[4];
192 else if (ints[4] > 7)
193 printk(KERN_WARNING "mac_scsi_setup: invalid host ID %d !\n", ints[4] );
194 }
195 #ifdef SUPPORT_TAGS
196 if (ints[0] >= 5) {
197 if (ints[5] >= 0)
198 setup_use_tagged_queuing = !!ints[5];
199 }
200
201 if (ints[0] == 6) {
202 if (ints[6] >= 0)
203 setup_use_pdma = ints[6];
204 }
205 #else
206 if (ints[0] == 5) {
207 if (ints[5] >= 0)
208 setup_use_pdma = ints[5];
209 }
210 #endif /* SUPPORT_TAGS */
211
212 #endif /* DRIVER_SETUP */
213 return 1;
214 }
215
216 __setup("mac5380=", mac_scsi_setup);
217
218 /*
219 * If you want to find the instance with (k)gdb ...
220 */
221 #if NDEBUG
222 static struct Scsi_Host *default_instance;
223 #endif
224
225 /*
226 * Function : int macscsi_detect(struct scsi_host_template * tpnt)
227 *
228 * Purpose : initializes mac NCR5380 driver based on the
229 * command line / compile time port and irq definitions.
230 *
231 * Inputs : tpnt - template for this SCSI adapter.
232 *
233 * Returns : 1 if a host adapter was found, 0 if not.
234 *
235 */
236
237 int macscsi_detect(struct scsi_host_template * tpnt)
238 {
239 static int called = 0;
240 int flags = 0;
241 struct Scsi_Host *instance;
242
243 if (!MACH_IS_MAC || called)
244 return( 0 );
245
246 if (macintosh_config->scsi_type != MAC_SCSI_OLD)
247 return( 0 );
248
249 /* setup variables */
250 tpnt->can_queue =
251 (setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE;
252 tpnt->cmd_per_lun =
253 (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN;
254 tpnt->sg_tablesize =
255 (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE;
256
257 if (setup_hostid >= 0)
258 tpnt->this_id = setup_hostid;
259 else {
260 /* use 7 as default */
261 tpnt->this_id = 7;
262 }
263
264 #ifdef SUPPORT_TAGS
265 if (setup_use_tagged_queuing < 0)
266 setup_use_tagged_queuing = USE_TAGGED_QUEUING;
267 #endif
268
269 /* Once we support multiple 5380s (e.g. DuoDock) we'll do
270 something different here */
271 instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
272 #if NDEBUG
273 default_instance = instance;
274 #endif
275
276 if (macintosh_config->ident == MAC_MODEL_IIFX) {
277 mac_scsi_regp = via1+0x8000;
278 mac_scsi_drq = via1+0xE000;
279 mac_scsi_nodrq = via1+0xC000;
280 /* The IIFX should be able to do true DMA, but pseudo-dma doesn't work */
281 flags = FLAG_NO_PSEUDO_DMA;
282 } else {
283 mac_scsi_regp = via1+0x10000;
284 mac_scsi_drq = via1+0x6000;
285 mac_scsi_nodrq = via1+0x12000;
286 }
287
288 if (! setup_use_pdma)
289 flags = FLAG_NO_PSEUDO_DMA;
290
291 instance->io_port = (unsigned long) mac_scsi_regp;
292 instance->irq = IRQ_MAC_SCSI;
293
294 #ifdef RESET_BOOT
295 mac_scsi_reset_boot(instance);
296 #endif
297
298 NCR5380_init(instance, flags);
299
300 instance->n_io_port = 255;
301
302 ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;
303
304 if (instance->irq != SCSI_IRQ_NONE)
305 if (request_irq(instance->irq, NCR5380_intr, IRQ_FLG_SLOW,
306 "ncr5380", instance)) {
307 printk(KERN_WARNING "scsi%d: IRQ%d not free, interrupts disabled\n",
308 instance->host_no, instance->irq);
309 instance->irq = SCSI_IRQ_NONE;
310 }
311
312 printk(KERN_INFO "scsi%d: generic 5380 at port %lX irq", instance->host_no, instance->io_port);
313 if (instance->irq == SCSI_IRQ_NONE)
314 printk (KERN_INFO "s disabled");
315 else
316 printk (KERN_INFO " %d", instance->irq);
317 printk(KERN_INFO " options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
318 instance->can_queue, instance->cmd_per_lun, MACSCSI_PUBLIC_RELEASE);
319 printk(KERN_INFO "\nscsi%d:", instance->host_no);
320 NCR5380_print_options(instance);
321 printk("\n");
322 called = 1;
323 return 1;
324 }
325
326 int macscsi_release (struct Scsi_Host *shpnt)
327 {
328 if (shpnt->irq != SCSI_IRQ_NONE)
329 free_irq(shpnt->irq, shpnt);
330 NCR5380_exit(shpnt);
331
332 return 0;
333 }
334
335 #ifdef RESET_BOOT
336 /*
337 * Our 'bus reset on boot' function
338 */
339
340 static void mac_scsi_reset_boot(struct Scsi_Host *instance)
341 {
342 unsigned long end;
343
344 NCR5380_local_declare();
345 NCR5380_setup(instance);
346
347 /*
348 * Do a SCSI reset to clean up the bus during initialization. No messing
349 * with the queues, interrupts, or locks necessary here.
350 */
351
352 printk(KERN_INFO "Macintosh SCSI: resetting the SCSI bus..." );
353
354 /* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */
355 disable_irq(IRQ_MAC_SCSI);
356
357 /* get in phase */
358 NCR5380_write( TARGET_COMMAND_REG,
359 PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
360
361 /* assert RST */
362 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
363 /* The min. reset hold time is 25us, so 40us should be enough */
364 udelay( 50 );
365 /* reset RST and interrupt */
366 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
367 NCR5380_read( RESET_PARITY_INTERRUPT_REG );
368
369 for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
370 barrier();
371
372 /* switch on SCSI IRQ again */
373 enable_irq(IRQ_MAC_SCSI);
374
375 printk(KERN_INFO " done\n" );
376 }
377 #endif
378
379 const char * macscsi_info (struct Scsi_Host *spnt) {
380 return "";
381 }
382
383 /*
384 Pseudo-DMA: (Ove Edlund)
385 The code attempts to catch bus errors that occur if one for example
386 "trips over the cable".
387 XXX: Since bus errors in the PDMA routines never happen on my
388 computer, the bus error code is untested.
389 If the code works as intended, a bus error results in Pseudo-DMA
390 beeing disabled, meaning that the driver switches to slow handshake.
391 If bus errors are NOT extremely rare, this has to be changed.
392 */
393
394 #define CP_IO_TO_MEM(s,d,len) \
395 __asm__ __volatile__ \
396 (" cmp.w #4,%2\n" \
397 " bls 8f\n" \
398 " move.w %1,%%d0\n" \
399 " neg.b %%d0\n" \
400 " and.w #3,%%d0\n" \
401 " sub.w %%d0,%2\n" \
402 " bra 2f\n" \
403 " 1: move.b (%0),(%1)+\n" \
404 " 2: dbf %%d0,1b\n" \
405 " move.w %2,%%d0\n" \
406 " lsr.w #5,%%d0\n" \
407 " bra 4f\n" \
408 " 3: move.l (%0),(%1)+\n" \
409 "31: move.l (%0),(%1)+\n" \
410 "32: move.l (%0),(%1)+\n" \
411 "33: move.l (%0),(%1)+\n" \
412 "34: move.l (%0),(%1)+\n" \
413 "35: move.l (%0),(%1)+\n" \
414 "36: move.l (%0),(%1)+\n" \
415 "37: move.l (%0),(%1)+\n" \
416 " 4: dbf %%d0,3b\n" \
417 " move.w %2,%%d0\n" \
418 " lsr.w #2,%%d0\n" \
419 " and.w #7,%%d0\n" \
420 " bra 6f\n" \
421 " 5: move.l (%0),(%1)+\n" \
422 " 6: dbf %%d0,5b\n" \
423 " and.w #3,%2\n" \
424 " bra 8f\n" \
425 " 7: move.b (%0),(%1)+\n" \
426 " 8: dbf %2,7b\n" \
427 " moveq.l #0, %2\n" \
428 " 9: \n" \
429 ".section .fixup,\"ax\"\n" \
430 " .even\n" \
431 "90: moveq.l #1, %2\n" \
432 " jra 9b\n" \
433 ".previous\n" \
434 ".section __ex_table,\"a\"\n" \
435 " .align 4\n" \
436 " .long 1b,90b\n" \
437 " .long 3b,90b\n" \
438 " .long 31b,90b\n" \
439 " .long 32b,90b\n" \
440 " .long 33b,90b\n" \
441 " .long 34b,90b\n" \
442 " .long 35b,90b\n" \
443 " .long 36b,90b\n" \
444 " .long 37b,90b\n" \
445 " .long 5b,90b\n" \
446 " .long 7b,90b\n" \
447 ".previous" \
448 : "=a"(s), "=a"(d), "=d"(len) \
449 : "0"(s), "1"(d), "2"(len) \
450 : "d0")
451
452
453 static int macscsi_pread (struct Scsi_Host *instance,
454 unsigned char *dst, int len)
455 {
456 unsigned char *d;
457 volatile unsigned char *s;
458
459 NCR5380_local_declare();
460 NCR5380_setup(instance);
461
462 s = mac_scsi_drq+0x60;
463 d = dst;
464
465 /* These conditions are derived from MacOS */
466
467 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
468 && !(NCR5380_read(STATUS_REG) & SR_REQ))
469 ;
470 if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
471 && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)) {
472 printk(KERN_ERR "Error in macscsi_pread\n");
473 return -1;
474 }
475
476 CP_IO_TO_MEM(s, d, len);
477
478 if (len != 0) {
479 printk(KERN_NOTICE "Bus error in macscsi_pread\n");
480 return -1;
481 }
482
483 return 0;
484 }
485
486
487 #define CP_MEM_TO_IO(s,d,len) \
488 __asm__ __volatile__ \
489 (" cmp.w #4,%2\n" \
490 " bls 8f\n" \
491 " move.w %0,%%d0\n" \
492 " neg.b %%d0\n" \
493 " and.w #3,%%d0\n" \
494 " sub.w %%d0,%2\n" \
495 " bra 2f\n" \
496 " 1: move.b (%0)+,(%1)\n" \
497 " 2: dbf %%d0,1b\n" \
498 " move.w %2,%%d0\n" \
499 " lsr.w #5,%%d0\n" \
500 " bra 4f\n" \
501 " 3: move.l (%0)+,(%1)\n" \
502 "31: move.l (%0)+,(%1)\n" \
503 "32: move.l (%0)+,(%1)\n" \
504 "33: move.l (%0)+,(%1)\n" \
505 "34: move.l (%0)+,(%1)\n" \
506 "35: move.l (%0)+,(%1)\n" \
507 "36: move.l (%0)+,(%1)\n" \
508 "37: move.l (%0)+,(%1)\n" \
509 " 4: dbf %%d0,3b\n" \
510 " move.w %2,%%d0\n" \
511 " lsr.w #2,%%d0\n" \
512 " and.w #7,%%d0\n" \
513 " bra 6f\n" \
514 " 5: move.l (%0)+,(%1)\n" \
515 " 6: dbf %%d0,5b\n" \
516 " and.w #3,%2\n" \
517 " bra 8f\n" \
518 " 7: move.b (%0)+,(%1)\n" \
519 " 8: dbf %2,7b\n" \
520 " moveq.l #0, %2\n" \
521 " 9: \n" \
522 ".section .fixup,\"ax\"\n" \
523 " .even\n" \
524 "90: moveq.l #1, %2\n" \
525 " jra 9b\n" \
526 ".previous\n" \
527 ".section __ex_table,\"a\"\n" \
528 " .align 4\n" \
529 " .long 1b,90b\n" \
530 " .long 3b,90b\n" \
531 " .long 31b,90b\n" \
532 " .long 32b,90b\n" \
533 " .long 33b,90b\n" \
534 " .long 34b,90b\n" \
535 " .long 35b,90b\n" \
536 " .long 36b,90b\n" \
537 " .long 37b,90b\n" \
538 " .long 5b,90b\n" \
539 " .long 7b,90b\n" \
540 ".previous" \
541 : "=a"(s), "=a"(d), "=d"(len) \
542 : "0"(s), "1"(d), "2"(len) \
543 : "d0")
544
545 static int macscsi_pwrite (struct Scsi_Host *instance,
546 unsigned char *src, int len)
547 {
548 unsigned char *s;
549 volatile unsigned char *d;
550
551 NCR5380_local_declare();
552 NCR5380_setup(instance);
553
554 s = src;
555 d = mac_scsi_drq;
556
557 /* These conditions are derived from MacOS */
558
559 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
560 && (!(NCR5380_read(STATUS_REG) & SR_REQ)
561 || (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)))
562 ;
563 if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)) {
564 printk(KERN_ERR "Error in macscsi_pwrite\n");
565 return -1;
566 }
567
568 CP_MEM_TO_IO(s, d, len);
569
570 if (len != 0) {
571 printk(KERN_NOTICE "Bus error in macscsi_pwrite\n");
572 return -1;
573 }
574
575 return 0;
576 }
577
578
579 #include "NCR5380.c"
580
581 static struct scsi_host_template driver_template = {
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,
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"
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