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mac_scsi.c
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1 /*
2  * Generic Macintosh NCR5380 driver
3  *
4  * Copyright 1998, Michael Schmitz <[email protected]>
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 
264  if (macintosh_config->ident == MAC_MODEL_IIFX) {
265  mac_scsi_regp = via1+0x8000;
266  mac_scsi_drq = via1+0xE000;
267  mac_scsi_nodrq = via1+0xC000;
268  /* The IIFX should be able to do true DMA, but pseudo-dma doesn't work */
269  flags = FLAG_NO_PSEUDO_DMA;
270  } else {
271  mac_scsi_regp = via1+0x10000;
272  mac_scsi_drq = via1+0x6000;
273  mac_scsi_nodrq = via1+0x12000;
274  }
275 
276  if (! setup_use_pdma)
277  flags = FLAG_NO_PSEUDO_DMA;
278 
279  instance->io_port = (unsigned long) mac_scsi_regp;
280  instance->irq = IRQ_MAC_SCSI;
281 
282 #ifdef RESET_BOOT
283  mac_scsi_reset_boot(instance);
284 #endif
285 
286  NCR5380_init(instance, flags);
287 
288  instance->n_io_port = 255;
289 
290  ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;
291 
292  if (instance->irq != SCSI_IRQ_NONE)
293  if (request_irq(instance->irq, NCR5380_intr, 0, "ncr5380", instance)) {
294  printk(KERN_WARNING "scsi%d: IRQ%d not free, interrupts disabled\n",
295  instance->host_no, instance->irq);
296  instance->irq = SCSI_IRQ_NONE;
297  }
298 
299  printk(KERN_INFO "scsi%d: generic 5380 at port %lX irq", instance->host_no, instance->io_port);
300  if (instance->irq == SCSI_IRQ_NONE)
301  printk (KERN_INFO "s disabled");
302  else
303  printk (KERN_INFO " %d", instance->irq);
304  printk(KERN_INFO " options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
305  instance->can_queue, instance->cmd_per_lun, MACSCSI_PUBLIC_RELEASE);
306  printk(KERN_INFO "\nscsi%d:", instance->host_no);
307  NCR5380_print_options(instance);
308  printk("\n");
309  called = 1;
310  return 1;
311 }
312 
313 int macscsi_release (struct Scsi_Host *shpnt)
314 {
315  if (shpnt->irq != SCSI_IRQ_NONE)
316  free_irq(shpnt->irq, shpnt);
317  NCR5380_exit(shpnt);
318 
319  return 0;
320 }
321 
322 #ifdef RESET_BOOT
323 /*
324  * Our 'bus reset on boot' function
325  */
326 
327 static void mac_scsi_reset_boot(struct Scsi_Host *instance)
328 {
329  unsigned long end;
330 
331  NCR5380_local_declare();
332  NCR5380_setup(instance);
333 
334  /*
335  * Do a SCSI reset to clean up the bus during initialization. No messing
336  * with the queues, interrupts, or locks necessary here.
337  */
338 
339  printk(KERN_INFO "Macintosh SCSI: resetting the SCSI bus..." );
340 
341  /* get in phase */
342  NCR5380_write( TARGET_COMMAND_REG,
343  PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
344 
345  /* assert RST */
346  NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
347  /* The min. reset hold time is 25us, so 40us should be enough */
348  udelay( 50 );
349  /* reset RST and interrupt */
350  NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
351  NCR5380_read( RESET_PARITY_INTERRUPT_REG );
352 
353  for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
354  barrier();
355 
356  printk(KERN_INFO " done\n" );
357 }
358 #endif
359 
360 const char * macscsi_info (struct Scsi_Host *spnt) {
361  return "";
362 }
363 
364 /*
365  Pseudo-DMA: (Ove Edlund)
366  The code attempts to catch bus errors that occur if one for example
367  "trips over the cable".
368  XXX: Since bus errors in the PDMA routines never happen on my
369  computer, the bus error code is untested.
370  If the code works as intended, a bus error results in Pseudo-DMA
371  beeing disabled, meaning that the driver switches to slow handshake.
372  If bus errors are NOT extremely rare, this has to be changed.
373 */
374 
375 #define CP_IO_TO_MEM(s,d,len) \
376 __asm__ __volatile__ \
377  (" cmp.w #4,%2\n" \
378  " bls 8f\n" \
379  " move.w %1,%%d0\n" \
380  " neg.b %%d0\n" \
381  " and.w #3,%%d0\n" \
382  " sub.w %%d0,%2\n" \
383  " bra 2f\n" \
384  " 1: move.b (%0),(%1)+\n" \
385  " 2: dbf %%d0,1b\n" \
386  " move.w %2,%%d0\n" \
387  " lsr.w #5,%%d0\n" \
388  " bra 4f\n" \
389  " 3: move.l (%0),(%1)+\n" \
390  "31: move.l (%0),(%1)+\n" \
391  "32: move.l (%0),(%1)+\n" \
392  "33: move.l (%0),(%1)+\n" \
393  "34: move.l (%0),(%1)+\n" \
394  "35: move.l (%0),(%1)+\n" \
395  "36: move.l (%0),(%1)+\n" \
396  "37: move.l (%0),(%1)+\n" \
397  " 4: dbf %%d0,3b\n" \
398  " move.w %2,%%d0\n" \
399  " lsr.w #2,%%d0\n" \
400  " and.w #7,%%d0\n" \
401  " bra 6f\n" \
402  " 5: move.l (%0),(%1)+\n" \
403  " 6: dbf %%d0,5b\n" \
404  " and.w #3,%2\n" \
405  " bra 8f\n" \
406  " 7: move.b (%0),(%1)+\n" \
407  " 8: dbf %2,7b\n" \
408  " moveq.l #0, %2\n" \
409  " 9: \n" \
410  ".section .fixup,\"ax\"\n" \
411  " .even\n" \
412  "90: moveq.l #1, %2\n" \
413  " jra 9b\n" \
414  ".previous\n" \
415  ".section __ex_table,\"a\"\n" \
416  " .align 4\n" \
417  " .long 1b,90b\n" \
418  " .long 3b,90b\n" \
419  " .long 31b,90b\n" \
420  " .long 32b,90b\n" \
421  " .long 33b,90b\n" \
422  " .long 34b,90b\n" \
423  " .long 35b,90b\n" \
424  " .long 36b,90b\n" \
425  " .long 37b,90b\n" \
426  " .long 5b,90b\n" \
427  " .long 7b,90b\n" \
428  ".previous" \
429  : "=a"(s), "=a"(d), "=d"(len) \
430  : "0"(s), "1"(d), "2"(len) \
431  : "d0")
432 
433 
434 static int macscsi_pread (struct Scsi_Host *instance,
435  unsigned char *dst, int len)
436 {
437  unsigned char *d;
438  volatile unsigned char *s;
439 
440  NCR5380_local_declare();
441  NCR5380_setup(instance);
442 
443  s = mac_scsi_drq+0x60;
444  d = dst;
445 
446 /* These conditions are derived from MacOS */
447 
448  while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
449  && !(NCR5380_read(STATUS_REG) & SR_REQ))
450  ;
451  if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
452  && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)) {
453  printk(KERN_ERR "Error in macscsi_pread\n");
454  return -1;
455  }
456 
457  CP_IO_TO_MEM(s, d, len);
458 
459  if (len != 0) {
460  printk(KERN_NOTICE "Bus error in macscsi_pread\n");
461  return -1;
462  }
463 
464  return 0;
465 }
466 
467 
468 #define CP_MEM_TO_IO(s,d,len) \
469 __asm__ __volatile__ \
470  (" cmp.w #4,%2\n" \
471  " bls 8f\n" \
472  " move.w %0,%%d0\n" \
473  " neg.b %%d0\n" \
474  " and.w #3,%%d0\n" \
475  " sub.w %%d0,%2\n" \
476  " bra 2f\n" \
477  " 1: move.b (%0)+,(%1)\n" \
478  " 2: dbf %%d0,1b\n" \
479  " move.w %2,%%d0\n" \
480  " lsr.w #5,%%d0\n" \
481  " bra 4f\n" \
482  " 3: move.l (%0)+,(%1)\n" \
483  "31: move.l (%0)+,(%1)\n" \
484  "32: move.l (%0)+,(%1)\n" \
485  "33: move.l (%0)+,(%1)\n" \
486  "34: move.l (%0)+,(%1)\n" \
487  "35: move.l (%0)+,(%1)\n" \
488  "36: move.l (%0)+,(%1)\n" \
489  "37: move.l (%0)+,(%1)\n" \
490  " 4: dbf %%d0,3b\n" \
491  " move.w %2,%%d0\n" \
492  " lsr.w #2,%%d0\n" \
493  " and.w #7,%%d0\n" \
494  " bra 6f\n" \
495  " 5: move.l (%0)+,(%1)\n" \
496  " 6: dbf %%d0,5b\n" \
497  " and.w #3,%2\n" \
498  " bra 8f\n" \
499  " 7: move.b (%0)+,(%1)\n" \
500  " 8: dbf %2,7b\n" \
501  " moveq.l #0, %2\n" \
502  " 9: \n" \
503  ".section .fixup,\"ax\"\n" \
504  " .even\n" \
505  "90: moveq.l #1, %2\n" \
506  " jra 9b\n" \
507  ".previous\n" \
508  ".section __ex_table,\"a\"\n" \
509  " .align 4\n" \
510  " .long 1b,90b\n" \
511  " .long 3b,90b\n" \
512  " .long 31b,90b\n" \
513  " .long 32b,90b\n" \
514  " .long 33b,90b\n" \
515  " .long 34b,90b\n" \
516  " .long 35b,90b\n" \
517  " .long 36b,90b\n" \
518  " .long 37b,90b\n" \
519  " .long 5b,90b\n" \
520  " .long 7b,90b\n" \
521  ".previous" \
522  : "=a"(s), "=a"(d), "=d"(len) \
523  : "0"(s), "1"(d), "2"(len) \
524  : "d0")
525 
526 static int macscsi_pwrite (struct Scsi_Host *instance,
527  unsigned char *src, int len)
528 {
529  unsigned char *s;
530  volatile unsigned char *d;
531 
532  NCR5380_local_declare();
533  NCR5380_setup(instance);
534 
535  s = src;
536  d = mac_scsi_drq;
537 
538 /* These conditions are derived from MacOS */
539 
540  while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
541  && (!(NCR5380_read(STATUS_REG) & SR_REQ)
542  || (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)))
543  ;
544  if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)) {
545  printk(KERN_ERR "Error in macscsi_pwrite\n");
546  return -1;
547  }
548 
549  CP_MEM_TO_IO(s, d, len);
550 
551  if (len != 0) {
552  printk(KERN_NOTICE "Bus error in macscsi_pwrite\n");
553  return -1;
554  }
555 
556  return 0;
557 }
558 
559 
560 #include "NCR5380.c"
561 
562 static struct scsi_host_template driver_template = {
563  .proc_name = "Mac5380",
564  .proc_info = macscsi_proc_info,
565  .name = "Macintosh NCR5380 SCSI",
566  .detect = macscsi_detect,
567  .release = macscsi_release,
568  .info = macscsi_info,
569  .queuecommand = macscsi_queue_command,
570  .eh_abort_handler = macscsi_abort,
571  .eh_bus_reset_handler = macscsi_bus_reset,
572  .can_queue = CAN_QUEUE,
573  .this_id = 7,
574  .sg_tablesize = SG_ALL,
575  .cmd_per_lun = CMD_PER_LUN,
576  .use_clustering = DISABLE_CLUSTERING
577 };
578 
579 
580 #include "scsi_module.c"
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