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