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Linux 2.6.22-rc3
[linux-2.6/next.git] / drivers / scsi / mac_scsi.c
blobcdbcaa5ad6cfbcd2b7cb89f34828515784bf12e5
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 #include "NCR5380.h"
57
58 #if 0
59 #define NDEBUG (NDEBUG_INTR | NDEBUG_PSEUDO_DMA | NDEBUG_ARBITRATION | NDEBUG_SELECTION | NDEBUG_RESELECTION)
60 #else
61 #define NDEBUG (NDEBUG_ABORT)
62 #endif
63
64 #define RESET_BOOT
65 #define DRIVER_SETUP
66
67 extern void via_scsi_clear(void);
68
69 #ifdef RESET_BOOT
70 static void mac_scsi_reset_boot(struct Scsi_Host *instance);
71 #endif
72
73 static int setup_called = 0;
74 static int setup_can_queue = -1;
75 static int setup_cmd_per_lun = -1;
76 static int setup_sg_tablesize = -1;
77 static int setup_use_pdma = -1;
78 #ifdef SUPPORT_TAGS
79 static int setup_use_tagged_queuing = -1;
80 #endif
81 static int setup_hostid = -1;
82
83 /* Time (in jiffies) to wait after a reset; the SCSI standard calls for 250ms,
84 * we usually do 0.5s to be on the safe side. But Toshiba CD-ROMs once more
85 * need ten times the standard value... */
86 #define TOSHIBA_DELAY
87
88 #ifdef TOSHIBA_DELAY
89 #define AFTER_RESET_DELAY (5*HZ/2)
90 #else
91 #define AFTER_RESET_DELAY (HZ/2)
92 #endif
93
94 static volatile unsigned char *mac_scsi_regp = NULL;
95 static volatile unsigned char *mac_scsi_drq = NULL;
96 static volatile unsigned char *mac_scsi_nodrq = NULL;
97
98
99 /*
100 * NCR 5380 register access functions
101 */
102
103 #if 0
104 /* Debug versions */
105 #define CTRL(p,v) (*ctrl = (v))
106
107 static char macscsi_read(struct Scsi_Host *instance, int reg)
108 {
109 int iobase = instance->io_port;
110 int i;
111 int *ctrl = &((struct NCR5380_hostdata *)instance->hostdata)->ctrl;
112
113 CTRL(iobase, 0);
114 i = in_8(iobase + (reg<<4));
115 CTRL(iobase, 0x40);
116
117 return i;
118 }
119
120 static void macscsi_write(struct Scsi_Host *instance, int reg, int value)
121 {
122 int iobase = instance->io_port;
123 int *ctrl = &((struct NCR5380_hostdata *)instance->hostdata)->ctrl;
124
125 CTRL(iobase, 0);
126 out_8(iobase + (reg<<4), value);
127 CTRL(iobase, 0x40);
128 }
129 #else
130
131 /* Fast versions */
132 static __inline__ char macscsi_read(struct Scsi_Host *instance, int reg)
133 {
134 return in_8(instance->io_port + (reg<<4));
135 }
136
137 static __inline__ void macscsi_write(struct Scsi_Host *instance, int reg, int value)
138 {
139 out_8(instance->io_port + (reg<<4), value);
140 }
141 #endif
142
143
144 /*
145 * Function : mac_scsi_setup(char *str)
146 *
147 * Purpose : booter command line initialization of the overrides array,
148 *
149 * Inputs : str - comma delimited list of options
150 *
151 */
152
153 static int __init mac_scsi_setup(char *str) {
154 #ifdef DRIVER_SETUP
155 int ints[7];
156
157 (void)get_options( str, ARRAY_SIZE(ints), ints);
158
159 if (setup_called++ || ints[0] < 1 || ints[0] > 6) {
160 printk(KERN_WARNING "scsi: <mac5380>"
161 " Usage: mac5380=<can_queue>[,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>,<use_pdma>]\n");
162 printk(KERN_ALERT "scsi: <mac5380> Bad Penguin parameters?\n");
163 return 0;
164 }
165
166 if (ints[0] >= 1) {
167 if (ints[1] > 0)
168 /* no limits on this, just > 0 */
169 setup_can_queue = ints[1];
170 }
171 if (ints[0] >= 2) {
172 if (ints[2] > 0)
173 setup_cmd_per_lun = ints[2];
174 }
175 if (ints[0] >= 3) {
176 if (ints[3] >= 0) {
177 setup_sg_tablesize = ints[3];
178 /* Must be <= SG_ALL (255) */
179 if (setup_sg_tablesize > SG_ALL)
180 setup_sg_tablesize = SG_ALL;
181 }
182 }
183 if (ints[0] >= 4) {
184 /* Must be between 0 and 7 */
185 if (ints[4] >= 0 && ints[4] <= 7)
186 setup_hostid = ints[4];
187 else if (ints[4] > 7)
188 printk(KERN_WARNING "mac_scsi_setup: invalid host ID %d !\n", ints[4] );
189 }
190 #ifdef SUPPORT_TAGS
191 if (ints[0] >= 5) {
192 if (ints[5] >= 0)
193 setup_use_tagged_queuing = !!ints[5];
194 }
195
196 if (ints[0] == 6) {
197 if (ints[6] >= 0)
198 setup_use_pdma = ints[6];
199 }
200 #else
201 if (ints[0] == 5) {
202 if (ints[5] >= 0)
203 setup_use_pdma = ints[5];
204 }
205 #endif /* SUPPORT_TAGS */
206
207 #endif /* DRIVER_SETUP */
208 return 1;
209 }
210
211 __setup("mac5380=", mac_scsi_setup);
212
213 /*
214 * If you want to find the instance with (k)gdb ...
215 */
216 #if NDEBUG
217 static struct Scsi_Host *default_instance;
218 #endif
219
220 /*
221 * Function : int macscsi_detect(struct scsi_host_template * tpnt)
222 *
223 * Purpose : initializes mac NCR5380 driver based on the
224 * command line / compile time port and irq definitions.
225 *
226 * Inputs : tpnt - template for this SCSI adapter.
227 *
228 * Returns : 1 if a host adapter was found, 0 if not.
229 *
230 */
231
232 int macscsi_detect(struct scsi_host_template * tpnt)
233 {
234 static int called = 0;
235 int flags = 0;
236 struct Scsi_Host *instance;
237
238 if (!MACH_IS_MAC || called)
239 return( 0 );
240
241 if (macintosh_config->scsi_type != MAC_SCSI_OLD)
242 return( 0 );
243
244 /* setup variables */
245 tpnt->can_queue =
246 (setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE;
247 tpnt->cmd_per_lun =
248 (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN;
249 tpnt->sg_tablesize =
250 (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE;
251
252 if (setup_hostid >= 0)
253 tpnt->this_id = setup_hostid;
254 else {
255 /* use 7 as default */
256 tpnt->this_id = 7;
257 }
258
259 #ifdef SUPPORT_TAGS
260 if (setup_use_tagged_queuing < 0)
261 setup_use_tagged_queuing = USE_TAGGED_QUEUING;
262 #endif
263
264 /* Once we support multiple 5380s (e.g. DuoDock) we'll do
265 something different here */
266 instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
267 #if NDEBUG
268 default_instance = instance;
269 #endif
270
271 if (macintosh_config->ident == MAC_MODEL_IIFX) {
272 mac_scsi_regp = via1+0x8000;
273 mac_scsi_drq = via1+0xE000;
274 mac_scsi_nodrq = via1+0xC000;
275 /* The IIFX should be able to do true DMA, but pseudo-dma doesn't work */
276 flags = FLAG_NO_PSEUDO_DMA;
277 } else {
278 mac_scsi_regp = via1+0x10000;
279 mac_scsi_drq = via1+0x6000;
280 mac_scsi_nodrq = via1+0x12000;
281 }
282
283 if (! setup_use_pdma)
284 flags = FLAG_NO_PSEUDO_DMA;
285
286 instance->io_port = (unsigned long) mac_scsi_regp;
287 instance->irq = IRQ_MAC_SCSI;
288
289 #ifdef RESET_BOOT
290 mac_scsi_reset_boot(instance);
291 #endif
292
293 NCR5380_init(instance, flags);
294
295 instance->n_io_port = 255;
296
297 ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;
298
299 if (instance->irq != SCSI_IRQ_NONE)
300 if (request_irq(instance->irq, NCR5380_intr, IRQ_FLG_SLOW,
301 "ncr5380", instance)) {
302 printk(KERN_WARNING "scsi%d: IRQ%d not free, interrupts disabled\n",
303 instance->host_no, instance->irq);
304 instance->irq = SCSI_IRQ_NONE;
305 }
306
307 printk(KERN_INFO "scsi%d: generic 5380 at port %lX irq", instance->host_no, instance->io_port);
308 if (instance->irq == SCSI_IRQ_NONE)
309 printk (KERN_INFO "s disabled");
310 else
311 printk (KERN_INFO " %d", instance->irq);
312 printk(KERN_INFO " options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
313 instance->can_queue, instance->cmd_per_lun, MACSCSI_PUBLIC_RELEASE);
314 printk(KERN_INFO "\nscsi%d:", instance->host_no);
315 NCR5380_print_options(instance);
316 printk("\n");
317 called = 1;
318 return 1;
319 }
320
321 int macscsi_release (struct Scsi_Host *shpnt)
322 {
323 if (shpnt->irq != SCSI_IRQ_NONE)
324 free_irq (shpnt->irq, NCR5380_intr);
325 NCR5380_exit(shpnt);
326
327 return 0;
328 }
329
330 #ifdef RESET_BOOT
331 /*
332 * Our 'bus reset on boot' function
333 */
334
335 static void mac_scsi_reset_boot(struct Scsi_Host *instance)
336 {
337 unsigned long end;
338
339 NCR5380_local_declare();
340 NCR5380_setup(instance);
341
342 /*
343 * Do a SCSI reset to clean up the bus during initialization. No messing
344 * with the queues, interrupts, or locks necessary here.
345 */
346
347 printk(KERN_INFO "Macintosh SCSI: resetting the SCSI bus..." );
348
349 /* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */
350 disable_irq(IRQ_MAC_SCSI);
351
352 /* get in phase */
353 NCR5380_write( TARGET_COMMAND_REG,
354 PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
355
356 /* assert RST */
357 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
358 /* The min. reset hold time is 25us, so 40us should be enough */
359 udelay( 50 );
360 /* reset RST and interrupt */
361 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
362 NCR5380_read( RESET_PARITY_INTERRUPT_REG );
363
364 for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
365 barrier();
366
367 /* switch on SCSI IRQ again */
368 enable_irq(IRQ_MAC_SCSI);
369
370 printk(KERN_INFO " done\n" );
371 }
372 #endif
373
374 const char * macscsi_info (struct Scsi_Host *spnt) {
375 return "";
376 }
377
378 /*
379 Pseudo-DMA: (Ove Edlund)
380 The code attempts to catch bus errors that occur if one for example
381 "trips over the cable".
382 XXX: Since bus errors in the PDMA routines never happen on my
383 computer, the bus error code is untested.
384 If the code works as intended, a bus error results in Pseudo-DMA
385 beeing disabled, meaning that the driver switches to slow handshake.
386 If bus errors are NOT extremely rare, this has to be changed.
387 */
388
389 #define CP_IO_TO_MEM(s,d,len) \
390 __asm__ __volatile__ \
391 (" cmp.w #4,%2\n" \
392 " bls 8f\n" \
393 " move.w %1,%%d0\n" \
394 " neg.b %%d0\n" \
395 " and.w #3,%%d0\n" \
396 " sub.w %%d0,%2\n" \
397 " bra 2f\n" \
398 " 1: move.b (%0),(%1)+\n" \
399 " 2: dbf %%d0,1b\n" \
400 " move.w %2,%%d0\n" \
401 " lsr.w #5,%%d0\n" \
402 " bra 4f\n" \
403 " 3: move.l (%0),(%1)+\n" \
404 "31: move.l (%0),(%1)+\n" \
405 "32: move.l (%0),(%1)+\n" \
406 "33: move.l (%0),(%1)+\n" \
407 "34: move.l (%0),(%1)+\n" \
408 "35: move.l (%0),(%1)+\n" \
409 "36: move.l (%0),(%1)+\n" \
410 "37: move.l (%0),(%1)+\n" \
411 " 4: dbf %%d0,3b\n" \
412 " move.w %2,%%d0\n" \
413 " lsr.w #2,%%d0\n" \
414 " and.w #7,%%d0\n" \
415 " bra 6f\n" \
416 " 5: move.l (%0),(%1)+\n" \
417 " 6: dbf %%d0,5b\n" \
418 " and.w #3,%2\n" \
419 " bra 8f\n" \
420 " 7: move.b (%0),(%1)+\n" \
421 " 8: dbf %2,7b\n" \
422 " moveq.l #0, %2\n" \
423 " 9: \n" \
424 ".section .fixup,\"ax\"\n" \
425 " .even\n" \
426 "90: moveq.l #1, %2\n" \
427 " jra 9b\n" \
428 ".previous\n" \
429 ".section __ex_table,\"a\"\n" \
430 " .align 4\n" \
431 " .long 1b,90b\n" \
432 " .long 3b,90b\n" \
433 " .long 31b,90b\n" \
434 " .long 32b,90b\n" \
435 " .long 33b,90b\n" \
436 " .long 34b,90b\n" \
437 " .long 35b,90b\n" \
438 " .long 36b,90b\n" \
439 " .long 37b,90b\n" \
440 " .long 5b,90b\n" \
441 " .long 7b,90b\n" \
442 ".previous" \
443 : "=a"(s), "=a"(d), "=d"(len) \
444 : "0"(s), "1"(d), "2"(len) \
445 : "d0")
446
447
448 static int macscsi_pread (struct Scsi_Host *instance,
449 unsigned char *dst, int len)
450 {
451 unsigned char *d;
452 volatile unsigned char *s;
453
454 NCR5380_local_declare();
455 NCR5380_setup(instance);
456
457 s = mac_scsi_drq+0x60;
458 d = dst;
459
460 /* These conditions are derived from MacOS */
461
462 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
463 && !(NCR5380_read(STATUS_REG) & SR_REQ))
464 ;
465 if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
466 && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)) {
467 printk(KERN_ERR "Error in macscsi_pread\n");
468 return -1;
469 }
470
471 CP_IO_TO_MEM(s, d, len);
472
473 if (len != 0) {
474 printk(KERN_NOTICE "Bus error in macscsi_pread\n");
475 return -1;
476 }
477
478 return 0;
479 }
480
481
482 #define CP_MEM_TO_IO(s,d,len) \
483 __asm__ __volatile__ \
484 (" cmp.w #4,%2\n" \
485 " bls 8f\n" \
486 " move.w %0,%%d0\n" \
487 " neg.b %%d0\n" \
488 " and.w #3,%%d0\n" \
489 " sub.w %%d0,%2\n" \
490 " bra 2f\n" \
491 " 1: move.b (%0)+,(%1)\n" \
492 " 2: dbf %%d0,1b\n" \
493 " move.w %2,%%d0\n" \
494 " lsr.w #5,%%d0\n" \
495 " bra 4f\n" \
496 " 3: move.l (%0)+,(%1)\n" \
497 "31: move.l (%0)+,(%1)\n" \
498 "32: move.l (%0)+,(%1)\n" \
499 "33: move.l (%0)+,(%1)\n" \
500 "34: move.l (%0)+,(%1)\n" \
501 "35: move.l (%0)+,(%1)\n" \
502 "36: move.l (%0)+,(%1)\n" \
503 "37: move.l (%0)+,(%1)\n" \
504 " 4: dbf %%d0,3b\n" \
505 " move.w %2,%%d0\n" \
506 " lsr.w #2,%%d0\n" \
507 " and.w #7,%%d0\n" \
508 " bra 6f\n" \
509 " 5: move.l (%0)+,(%1)\n" \
510 " 6: dbf %%d0,5b\n" \
511 " and.w #3,%2\n" \
512 " bra 8f\n" \
513 " 7: move.b (%0)+,(%1)\n" \
514 " 8: dbf %2,7b\n" \
515 " moveq.l #0, %2\n" \
516 " 9: \n" \
517 ".section .fixup,\"ax\"\n" \
518 " .even\n" \
519 "90: moveq.l #1, %2\n" \
520 " jra 9b\n" \
521 ".previous\n" \
522 ".section __ex_table,\"a\"\n" \
523 " .align 4\n" \
524 " .long 1b,90b\n" \
525 " .long 3b,90b\n" \
526 " .long 31b,90b\n" \
527 " .long 32b,90b\n" \
528 " .long 33b,90b\n" \
529 " .long 34b,90b\n" \
530 " .long 35b,90b\n" \
531 " .long 36b,90b\n" \
532 " .long 37b,90b\n" \
533 " .long 5b,90b\n" \
534 " .long 7b,90b\n" \
535 ".previous" \
536 : "=a"(s), "=a"(d), "=d"(len) \
537 : "0"(s), "1"(d), "2"(len) \
538 : "d0")
539
540 static int macscsi_pwrite (struct Scsi_Host *instance,
541 unsigned char *src, int len)
542 {
543 unsigned char *s;
544 volatile unsigned char *d;
545
546 NCR5380_local_declare();
547 NCR5380_setup(instance);
548
549 s = src;
550 d = mac_scsi_drq;
551
552 /* These conditions are derived from MacOS */
553
554 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
555 && (!(NCR5380_read(STATUS_REG) & SR_REQ)
556 || (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)))
557 ;
558 if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)) {
559 printk(KERN_ERR "Error in macscsi_pwrite\n");
560 return -1;
561 }
562
563 CP_MEM_TO_IO(s, d, len);
564
565 if (len != 0) {
566 printk(KERN_NOTICE "Bus error in macscsi_pwrite\n");
567 return -1;
568 }
569
570 return 0;
571 }
572
573
574 /* These control the behaviour of the generic 5380 core */
575 #define AUTOSENSE
576 #define PSEUDO_DMA
577
578 #include "NCR5380.c"
579
580 static struct scsi_host_template driver_template = {
581 .proc_name = "Mac5380",
582 .proc_info = macscsi_proc_info,
583 .name = "Macintosh NCR5380 SCSI",
584 .detect = macscsi_detect,
585 .release = macscsi_release,
586 .info = macscsi_info,
587 .queuecommand = macscsi_queue_command,
588 .eh_abort_handler = macscsi_abort,
589 .eh_bus_reset_handler = macscsi_bus_reset,
590 .can_queue = CAN_QUEUE,
591 .this_id = 7,
592 .sg_tablesize = SG_ALL,
593 .cmd_per_lun = CMD_PER_LUN,
594 .unchecked_isa_dma = 0,
595 .use_clustering = DISABLE_CLUSTERING
596 };
597
598
599 #include "scsi_module.c"
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