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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / scsi / mac_scsi.c
blob2bccfbe5661e652bc24736cc572004698a7aecca
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/mac_via.h>
51
52 #include "scsi.h"
53 #include <scsi/scsi_host.h>
54 #include "mac_scsi.h"
55
56 /* These control the behaviour of the generic 5380 core */
57 #define AUTOSENSE
58 #define PSEUDO_DMA
59
60 #include "NCR5380.h"
61
62 #if 0
63 #define NDEBUG (NDEBUG_INTR | NDEBUG_PSEUDO_DMA | NDEBUG_ARBITRATION | NDEBUG_SELECTION | NDEBUG_RESELECTION)
64 #else
65 #define NDEBUG (NDEBUG_ABORT)
66 #endif
67
68 #define RESET_BOOT
69 #define DRIVER_SETUP
70
71 extern void via_scsi_clear(void);
72
73 #ifdef RESET_BOOT
74 static void mac_scsi_reset_boot(struct Scsi_Host *instance);
75 #endif
76
77 static int setup_called = 0;
78 static int setup_can_queue = -1;
79 static int setup_cmd_per_lun = -1;
80 static int setup_sg_tablesize = -1;
81 static int setup_use_pdma = -1;
82 #ifdef SUPPORT_TAGS
83 static int setup_use_tagged_queuing = -1;
84 #endif
85 static int setup_hostid = -1;
86
87 /* Time (in jiffies) to wait after a reset; the SCSI standard calls for 250ms,
88 * we usually do 0.5s to be on the safe side. But Toshiba CD-ROMs once more
89 * need ten times the standard value... */
90 #define TOSHIBA_DELAY
91
92 #ifdef TOSHIBA_DELAY
93 #define AFTER_RESET_DELAY (5*HZ/2)
94 #else
95 #define AFTER_RESET_DELAY (HZ/2)
96 #endif
97
98 static volatile unsigned char *mac_scsi_regp = NULL;
99 static volatile unsigned char *mac_scsi_drq = NULL;
100 static volatile unsigned char *mac_scsi_nodrq = NULL;
101
102
103 /*
104 * NCR 5380 register access functions
105 */
106
107 #if 0
108 /* Debug versions */
109 #define CTRL(p,v) (*ctrl = (v))
110
111 static char macscsi_read(struct Scsi_Host *instance, int reg)
112 {
113 int iobase = instance->io_port;
114 int i;
115 int *ctrl = &((struct NCR5380_hostdata *)instance->hostdata)->ctrl;
116
117 CTRL(iobase, 0);
118 i = in_8(iobase + (reg<<4));
119 CTRL(iobase, 0x40);
120
121 return i;
122 }
123
124 static void macscsi_write(struct Scsi_Host *instance, int reg, int value)
125 {
126 int iobase = instance->io_port;
127 int *ctrl = &((struct NCR5380_hostdata *)instance->hostdata)->ctrl;
128
129 CTRL(iobase, 0);
130 out_8(iobase + (reg<<4), value);
131 CTRL(iobase, 0x40);
132 }
133 #else
134
135 /* Fast versions */
136 static __inline__ char macscsi_read(struct Scsi_Host *instance, int reg)
137 {
138 return in_8(instance->io_port + (reg<<4));
139 }
140
141 static __inline__ void macscsi_write(struct Scsi_Host *instance, int reg, int value)
142 {
143 out_8(instance->io_port + (reg<<4), value);
144 }
145 #endif
146
147
148 /*
149 * Function : mac_scsi_setup(char *str)
150 *
151 * Purpose : booter command line initialization of the overrides array,
152 *
153 * Inputs : str - comma delimited list of options
154 *
155 */
156
157 static int __init mac_scsi_setup(char *str) {
158 #ifdef DRIVER_SETUP
159 int ints[7];
160
161 (void)get_options( str, ARRAY_SIZE(ints), ints);
162
163 if (setup_called++ || ints[0] < 1 || ints[0] > 6) {
164 printk(KERN_WARNING "scsi: <mac5380>"
165 " Usage: mac5380=<can_queue>[,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>,<use_pdma>]\n");
166 printk(KERN_ALERT "scsi: <mac5380> Bad Penguin parameters?\n");
167 return 0;
168 }
169
170 if (ints[0] >= 1) {
171 if (ints[1] > 0)
172 /* no limits on this, just > 0 */
173 setup_can_queue = ints[1];
174 }
175 if (ints[0] >= 2) {
176 if (ints[2] > 0)
177 setup_cmd_per_lun = ints[2];
178 }
179 if (ints[0] >= 3) {
180 if (ints[3] >= 0) {
181 setup_sg_tablesize = ints[3];
182 /* Must be <= SG_ALL (255) */
183 if (setup_sg_tablesize > SG_ALL)
184 setup_sg_tablesize = SG_ALL;
185 }
186 }
187 if (ints[0] >= 4) {
188 /* Must be between 0 and 7 */
189 if (ints[4] >= 0 && ints[4] <= 7)
190 setup_hostid = ints[4];
191 else if (ints[4] > 7)
192 printk(KERN_WARNING "mac_scsi_setup: invalid host ID %d !\n", ints[4] );
193 }
194 #ifdef SUPPORT_TAGS
195 if (ints[0] >= 5) {
196 if (ints[5] >= 0)
197 setup_use_tagged_queuing = !!ints[5];
198 }
199
200 if (ints[0] == 6) {
201 if (ints[6] >= 0)
202 setup_use_pdma = ints[6];
203 }
204 #else
205 if (ints[0] == 5) {
206 if (ints[5] >= 0)
207 setup_use_pdma = ints[5];
208 }
209 #endif /* SUPPORT_TAGS */
210
211 #endif /* DRIVER_SETUP */
212 return 1;
213 }
214
215 __setup("mac5380=", mac_scsi_setup);
216
217 /*
218 * Function : int macscsi_detect(struct scsi_host_template * tpnt)
219 *
220 * Purpose : initializes mac NCR5380 driver based on the
221 * command line / compile time port and irq definitions.
222 *
223 * Inputs : tpnt - template for this SCSI adapter.
224 *
225 * Returns : 1 if a host adapter was found, 0 if not.
226 *
227 */
228
229 int __init macscsi_detect(struct scsi_host_template * tpnt)
230 {
231 static int called = 0;
232 int flags = 0;
233 struct Scsi_Host *instance;
234
235 if (!MACH_IS_MAC || called)
236 return( 0 );
237
238 if (macintosh_config->scsi_type != MAC_SCSI_OLD)
239 return( 0 );
240
241 /* setup variables */
242 tpnt->can_queue =
243 (setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE;
244 tpnt->cmd_per_lun =
245 (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN;
246 tpnt->sg_tablesize =
247 (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE;
248
249 if (setup_hostid >= 0)
250 tpnt->this_id = setup_hostid;
251 else {
252 /* use 7 as default */
253 tpnt->this_id = 7;
254 }
255
256 #ifdef SUPPORT_TAGS
257 if (setup_use_tagged_queuing < 0)
258 setup_use_tagged_queuing = USE_TAGGED_QUEUING;
259 #endif
260
261 /* Once we support multiple 5380s (e.g. DuoDock) we'll do
262 something different here */
263 instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
264
265 if (macintosh_config->ident == MAC_MODEL_IIFX) {
266 mac_scsi_regp = via1+0x8000;
267 mac_scsi_drq = via1+0xE000;
268 mac_scsi_nodrq = via1+0xC000;
269 /* The IIFX should be able to do true DMA, but pseudo-dma doesn't work */
270 flags = FLAG_NO_PSEUDO_DMA;
271 } else {
272 mac_scsi_regp = via1+0x10000;
273 mac_scsi_drq = via1+0x6000;
274 mac_scsi_nodrq = via1+0x12000;
275 }
276
277 if (! setup_use_pdma)
278 flags = FLAG_NO_PSEUDO_DMA;
279
280 instance->io_port = (unsigned long) mac_scsi_regp;
281 instance->irq = IRQ_MAC_SCSI;
282
283 #ifdef RESET_BOOT
284 mac_scsi_reset_boot(instance);
285 #endif
286
287 NCR5380_init(instance, flags);
288
289 instance->n_io_port = 255;
290
291 ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;
292
293 if (instance->irq != SCSI_IRQ_NONE)
294 if (request_irq(instance->irq, NCR5380_intr, 0, "ncr5380", instance)) {
295 printk(KERN_WARNING "scsi%d: IRQ%d not free, interrupts disabled\n",
296 instance->host_no, instance->irq);
297 instance->irq = SCSI_IRQ_NONE;
298 }
299
300 printk(KERN_INFO "scsi%d: generic 5380 at port %lX irq", instance->host_no, instance->io_port);
301 if (instance->irq == SCSI_IRQ_NONE)
302 printk (KERN_INFO "s disabled");
303 else
304 printk (KERN_INFO " %d", instance->irq);
305 printk(KERN_INFO " options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
306 instance->can_queue, instance->cmd_per_lun, MACSCSI_PUBLIC_RELEASE);
307 printk(KERN_INFO "\nscsi%d:", instance->host_no);
308 NCR5380_print_options(instance);
309 printk("\n");
310 called = 1;
311 return 1;
312 }
313
314 int macscsi_release (struct Scsi_Host *shpnt)
315 {
316 if (shpnt->irq != SCSI_IRQ_NONE)
317 free_irq(shpnt->irq, shpnt);
318 NCR5380_exit(shpnt);
319
320 return 0;
321 }
322
323 #ifdef RESET_BOOT
324 /*
325 * Our 'bus reset on boot' function
326 */
327
328 static void mac_scsi_reset_boot(struct Scsi_Host *instance)
329 {
330 unsigned long end;
331
332 NCR5380_local_declare();
333 NCR5380_setup(instance);
334
335 /*
336 * Do a SCSI reset to clean up the bus during initialization. No messing
337 * with the queues, interrupts, or locks necessary here.
338 */
339
340 printk(KERN_INFO "Macintosh SCSI: resetting the SCSI bus..." );
341
342 /* get in phase */
343 NCR5380_write( TARGET_COMMAND_REG,
344 PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
345
346 /* assert RST */
347 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
348 /* The min. reset hold time is 25us, so 40us should be enough */
349 udelay( 50 );
350 /* reset RST and interrupt */
351 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
352 NCR5380_read( RESET_PARITY_INTERRUPT_REG );
353
354 for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
355 barrier();
356
357 printk(KERN_INFO " done\n" );
358 }
359 #endif
360
361 const char * macscsi_info (struct Scsi_Host *spnt) {
362 return "";
363 }
364
365 /*
366 Pseudo-DMA: (Ove Edlund)
367 The code attempts to catch bus errors that occur if one for example
368 "trips over the cable".
369 XXX: Since bus errors in the PDMA routines never happen on my
370 computer, the bus error code is untested.
371 If the code works as intended, a bus error results in Pseudo-DMA
372 beeing disabled, meaning that the driver switches to slow handshake.
373 If bus errors are NOT extremely rare, this has to be changed.
374 */
375
376 #define CP_IO_TO_MEM(s,d,len) \
377 __asm__ __volatile__ \
378 (" cmp.w #4,%2\n" \
379 " bls 8f\n" \
380 " move.w %1,%%d0\n" \
381 " neg.b %%d0\n" \
382 " and.w #3,%%d0\n" \
383 " sub.w %%d0,%2\n" \
384 " bra 2f\n" \
385 " 1: move.b (%0),(%1)+\n" \
386 " 2: dbf %%d0,1b\n" \
387 " move.w %2,%%d0\n" \
388 " lsr.w #5,%%d0\n" \
389 " bra 4f\n" \
390 " 3: move.l (%0),(%1)+\n" \
391 "31: move.l (%0),(%1)+\n" \
392 "32: move.l (%0),(%1)+\n" \
393 "33: move.l (%0),(%1)+\n" \
394 "34: move.l (%0),(%1)+\n" \
395 "35: move.l (%0),(%1)+\n" \
396 "36: move.l (%0),(%1)+\n" \
397 "37: move.l (%0),(%1)+\n" \
398 " 4: dbf %%d0,3b\n" \
399 " move.w %2,%%d0\n" \
400 " lsr.w #2,%%d0\n" \
401 " and.w #7,%%d0\n" \
402 " bra 6f\n" \
403 " 5: move.l (%0),(%1)+\n" \
404 " 6: dbf %%d0,5b\n" \
405 " and.w #3,%2\n" \
406 " bra 8f\n" \
407 " 7: move.b (%0),(%1)+\n" \
408 " 8: dbf %2,7b\n" \
409 " moveq.l #0, %2\n" \
410 " 9: \n" \
411 ".section .fixup,\"ax\"\n" \
412 " .even\n" \
413 "90: moveq.l #1, %2\n" \
414 " jra 9b\n" \
415 ".previous\n" \
416 ".section __ex_table,\"a\"\n" \
417 " .align 4\n" \
418 " .long 1b,90b\n" \
419 " .long 3b,90b\n" \
420 " .long 31b,90b\n" \
421 " .long 32b,90b\n" \
422 " .long 33b,90b\n" \
423 " .long 34b,90b\n" \
424 " .long 35b,90b\n" \
425 " .long 36b,90b\n" \
426 " .long 37b,90b\n" \
427 " .long 5b,90b\n" \
428 " .long 7b,90b\n" \
429 ".previous" \
430 : "=a"(s), "=a"(d), "=d"(len) \
431 : "0"(s), "1"(d), "2"(len) \
432 : "d0")
433
434
435 static int macscsi_pread (struct Scsi_Host *instance,
436 unsigned char *dst, int len)
437 {
438 unsigned char *d;
439 volatile unsigned char *s;
440
441 NCR5380_local_declare();
442 NCR5380_setup(instance);
443
444 s = mac_scsi_drq+0x60;
445 d = dst;
446
447 /* These conditions are derived from MacOS */
448
449 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
450 && !(NCR5380_read(STATUS_REG) & SR_REQ))
451 ;
452 if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
453 && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)) {
454 printk(KERN_ERR "Error in macscsi_pread\n");
455 return -1;
456 }
457
458 CP_IO_TO_MEM(s, d, len);
459
460 if (len != 0) {
461 printk(KERN_NOTICE "Bus error in macscsi_pread\n");
462 return -1;
463 }
464
465 return 0;
466 }
467
468
469 #define CP_MEM_TO_IO(s,d,len) \
470 __asm__ __volatile__ \
471 (" cmp.w #4,%2\n" \
472 " bls 8f\n" \
473 " move.w %0,%%d0\n" \
474 " neg.b %%d0\n" \
475 " and.w #3,%%d0\n" \
476 " sub.w %%d0,%2\n" \
477 " bra 2f\n" \
478 " 1: move.b (%0)+,(%1)\n" \
479 " 2: dbf %%d0,1b\n" \
480 " move.w %2,%%d0\n" \
481 " lsr.w #5,%%d0\n" \
482 " bra 4f\n" \
483 " 3: move.l (%0)+,(%1)\n" \
484 "31: move.l (%0)+,(%1)\n" \
485 "32: move.l (%0)+,(%1)\n" \
486 "33: move.l (%0)+,(%1)\n" \
487 "34: move.l (%0)+,(%1)\n" \
488 "35: move.l (%0)+,(%1)\n" \
489 "36: move.l (%0)+,(%1)\n" \
490 "37: move.l (%0)+,(%1)\n" \
491 " 4: dbf %%d0,3b\n" \
492 " move.w %2,%%d0\n" \
493 " lsr.w #2,%%d0\n" \
494 " and.w #7,%%d0\n" \
495 " bra 6f\n" \
496 " 5: move.l (%0)+,(%1)\n" \
497 " 6: dbf %%d0,5b\n" \
498 " and.w #3,%2\n" \
499 " bra 8f\n" \
500 " 7: move.b (%0)+,(%1)\n" \
501 " 8: dbf %2,7b\n" \
502 " moveq.l #0, %2\n" \
503 " 9: \n" \
504 ".section .fixup,\"ax\"\n" \
505 " .even\n" \
506 "90: moveq.l #1, %2\n" \
507 " jra 9b\n" \
508 ".previous\n" \
509 ".section __ex_table,\"a\"\n" \
510 " .align 4\n" \
511 " .long 1b,90b\n" \
512 " .long 3b,90b\n" \
513 " .long 31b,90b\n" \
514 " .long 32b,90b\n" \
515 " .long 33b,90b\n" \
516 " .long 34b,90b\n" \
517 " .long 35b,90b\n" \
518 " .long 36b,90b\n" \
519 " .long 37b,90b\n" \
520 " .long 5b,90b\n" \
521 " .long 7b,90b\n" \
522 ".previous" \
523 : "=a"(s), "=a"(d), "=d"(len) \
524 : "0"(s), "1"(d), "2"(len) \
525 : "d0")
526
527 static int macscsi_pwrite (struct Scsi_Host *instance,
528 unsigned char *src, int len)
529 {
530 unsigned char *s;
531 volatile unsigned char *d;
532
533 NCR5380_local_declare();
534 NCR5380_setup(instance);
535
536 s = src;
537 d = mac_scsi_drq;
538
539 /* These conditions are derived from MacOS */
540
541 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
542 && (!(NCR5380_read(STATUS_REG) & SR_REQ)
543 || (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)))
544 ;
545 if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)) {
546 printk(KERN_ERR "Error in macscsi_pwrite\n");
547 return -1;
548 }
549
550 CP_MEM_TO_IO(s, d, len);
551
552 if (len != 0) {
553 printk(KERN_NOTICE "Bus error in macscsi_pwrite\n");
554 return -1;
555 }
556
557 return 0;
558 }
559
560
561 #include "NCR5380.c"
562
563 static struct scsi_host_template driver_template = {
564 .proc_name = "Mac5380",
565 .proc_info = macscsi_proc_info,
566 .name = "Macintosh NCR5380 SCSI",
567 .detect = macscsi_detect,
568 .release = macscsi_release,
569 .info = macscsi_info,
570 .queuecommand = macscsi_queue_command,
571 .eh_abort_handler = macscsi_abort,
572 .eh_bus_reset_handler = macscsi_bus_reset,
573 .can_queue = CAN_QUEUE,
574 .this_id = 7,
575 .sg_tablesize = SG_ALL,
576 .cmd_per_lun = CMD_PER_LUN,
577 .use_clustering = DISABLE_CLUSTERING
578 };
579
580
581 #include "scsi_module.c"