m68k: machw.h cleanup
[linux-2.6.git] / drivers / scsi / mac_scsi.c
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  * If you want to find the instance with (k)gdb ...
219  */
220 #if NDEBUG
221 static struct Scsi_Host *default_instance;
222 #endif
223
224 /*
225  * Function : int macscsi_detect(struct scsi_host_template * tpnt)
226  *
227  * Purpose : initializes mac NCR5380 driver based on the
228  *      command line / compile time port and irq definitions.
229  *
230  * Inputs : tpnt - template for this SCSI adapter.
231  *
232  * Returns : 1 if a host adapter was found, 0 if not.
233  *
234  */
235  
236 int macscsi_detect(struct scsi_host_template * tpnt)
237 {
238     static int called = 0;
239     int flags = 0;
240     struct Scsi_Host *instance;
241
242     if (!MACH_IS_MAC || called)
243         return( 0 );
244
245     if (macintosh_config->scsi_type != MAC_SCSI_OLD)
246         return( 0 );
247
248     /* setup variables */
249     tpnt->can_queue =
250         (setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE;
251     tpnt->cmd_per_lun =
252         (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN;
253     tpnt->sg_tablesize = 
254         (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE;
255
256     if (setup_hostid >= 0)
257         tpnt->this_id = setup_hostid;
258     else {
259         /* use 7 as default */
260         tpnt->this_id = 7;
261     }
262
263 #ifdef SUPPORT_TAGS
264     if (setup_use_tagged_queuing < 0)
265         setup_use_tagged_queuing = USE_TAGGED_QUEUING;
266 #endif
267
268     /* Once we support multiple 5380s (e.g. DuoDock) we'll do
269        something different here */
270     instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
271 #if NDEBUG
272     default_instance = instance;
273 #endif
274     
275     if (macintosh_config->ident == MAC_MODEL_IIFX) {
276         mac_scsi_regp  = via1+0x8000;
277         mac_scsi_drq   = via1+0xE000;
278         mac_scsi_nodrq = via1+0xC000;
279         /* The IIFX should be able to do true DMA, but pseudo-dma doesn't work */
280         flags = FLAG_NO_PSEUDO_DMA;
281     } else {
282         mac_scsi_regp  = via1+0x10000;
283         mac_scsi_drq   = via1+0x6000;
284         mac_scsi_nodrq = via1+0x12000;
285     }
286
287     if (! setup_use_pdma)
288         flags = FLAG_NO_PSEUDO_DMA;
289         
290     instance->io_port = (unsigned long) mac_scsi_regp;
291     instance->irq = IRQ_MAC_SCSI;
292
293 #ifdef RESET_BOOT   
294     mac_scsi_reset_boot(instance);
295 #endif
296     
297     NCR5380_init(instance, flags);
298
299     instance->n_io_port = 255;
300
301     ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;
302
303     if (instance->irq != SCSI_IRQ_NONE)
304         if (request_irq(instance->irq, NCR5380_intr, IRQ_FLG_SLOW, 
305                         "ncr5380", instance)) {
306             printk(KERN_WARNING "scsi%d: IRQ%d not free, interrupts disabled\n",
307                    instance->host_no, instance->irq);
308             instance->irq = SCSI_IRQ_NONE;
309         }
310
311     printk(KERN_INFO "scsi%d: generic 5380 at port %lX irq", instance->host_no, instance->io_port);
312     if (instance->irq == SCSI_IRQ_NONE)
313         printk (KERN_INFO "s disabled");
314     else
315         printk (KERN_INFO " %d", instance->irq);
316     printk(KERN_INFO " options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
317            instance->can_queue, instance->cmd_per_lun, MACSCSI_PUBLIC_RELEASE);
318     printk(KERN_INFO "\nscsi%d:", instance->host_no);
319     NCR5380_print_options(instance);
320     printk("\n");
321     called = 1;
322     return 1;
323 }
324
325 int macscsi_release (struct Scsi_Host *shpnt)
326 {
327         if (shpnt->irq != SCSI_IRQ_NONE)
328                 free_irq(shpnt->irq, shpnt);
329         NCR5380_exit(shpnt);
330
331         return 0;
332 }
333
334 #ifdef RESET_BOOT
335 /*
336  * Our 'bus reset on boot' function
337  */
338
339 static void mac_scsi_reset_boot(struct Scsi_Host *instance)
340 {
341         unsigned long end;
342
343         NCR5380_local_declare();
344         NCR5380_setup(instance);
345         
346         /*
347          * Do a SCSI reset to clean up the bus during initialization. No messing
348          * with the queues, interrupts, or locks necessary here.
349          */
350
351         printk(KERN_INFO "Macintosh SCSI: resetting the SCSI bus..." );
352
353         /* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */
354         disable_irq(IRQ_MAC_SCSI);
355
356         /* get in phase */
357         NCR5380_write( TARGET_COMMAND_REG,
358                       PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
359
360         /* assert RST */
361         NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
362         /* The min. reset hold time is 25us, so 40us should be enough */
363         udelay( 50 );
364         /* reset RST and interrupt */
365         NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
366         NCR5380_read( RESET_PARITY_INTERRUPT_REG );
367
368         for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
369                 barrier();
370
371         /* switch on SCSI IRQ again */
372         enable_irq(IRQ_MAC_SCSI);
373
374         printk(KERN_INFO " done\n" );
375 }
376 #endif
377
378 const char * macscsi_info (struct Scsi_Host *spnt) {
379         return "";
380 }
381
382 /* 
383    Pseudo-DMA: (Ove Edlund)
384    The code attempts to catch bus errors that occur if one for example
385    "trips over the cable".
386    XXX: Since bus errors in the PDMA routines never happen on my 
387    computer, the bus error code is untested. 
388    If the code works as intended, a bus error results in Pseudo-DMA 
389    beeing disabled, meaning that the driver switches to slow handshake. 
390    If bus errors are NOT extremely rare, this has to be changed. 
391 */
392
393 #define CP_IO_TO_MEM(s,d,len)                           \
394 __asm__ __volatile__                                    \
395     ("    cmp.w  #4,%2\n"                               \
396      "    bls    8f\n"                                  \
397      "    move.w %1,%%d0\n"                             \
398      "    neg.b  %%d0\n"                                \
399      "    and.w  #3,%%d0\n"                             \
400      "    sub.w  %%d0,%2\n"                             \
401      "    bra    2f\n"                                  \
402      " 1: move.b (%0),(%1)+\n"                          \
403      " 2: dbf    %%d0,1b\n"                             \
404      "    move.w %2,%%d0\n"                             \
405      "    lsr.w  #5,%%d0\n"                             \
406      "    bra    4f\n"                                  \
407      " 3: move.l (%0),(%1)+\n"                          \
408      "31: move.l (%0),(%1)+\n"                          \
409      "32: move.l (%0),(%1)+\n"                          \
410      "33: move.l (%0),(%1)+\n"                          \
411      "34: move.l (%0),(%1)+\n"                          \
412      "35: move.l (%0),(%1)+\n"                          \
413      "36: move.l (%0),(%1)+\n"                          \
414      "37: move.l (%0),(%1)+\n"                          \
415      " 4: dbf    %%d0,3b\n"                             \
416      "    move.w %2,%%d0\n"                             \
417      "    lsr.w  #2,%%d0\n"                             \
418      "    and.w  #7,%%d0\n"                             \
419      "    bra    6f\n"                                  \
420      " 5: move.l (%0),(%1)+\n"                          \
421      " 6: dbf    %%d0,5b\n"                             \
422      "    and.w  #3,%2\n"                               \
423      "    bra    8f\n"                                  \
424      " 7: move.b (%0),(%1)+\n"                          \
425      " 8: dbf    %2,7b\n"                               \
426      "    moveq.l #0, %2\n"                             \
427      " 9: \n"                                           \
428      ".section .fixup,\"ax\"\n"                         \
429      "    .even\n"                                      \
430      "90: moveq.l #1, %2\n"                             \
431      "    jra 9b\n"                                     \
432      ".previous\n"                                      \
433      ".section __ex_table,\"a\"\n"                      \
434      "   .align 4\n"                                    \
435      "   .long  1b,90b\n"                               \
436      "   .long  3b,90b\n"                               \
437      "   .long 31b,90b\n"                               \
438      "   .long 32b,90b\n"                               \
439      "   .long 33b,90b\n"                               \
440      "   .long 34b,90b\n"                               \
441      "   .long 35b,90b\n"                               \
442      "   .long 36b,90b\n"                               \
443      "   .long 37b,90b\n"                               \
444      "   .long  5b,90b\n"                               \
445      "   .long  7b,90b\n"                               \
446      ".previous"                                        \
447      : "=a"(s), "=a"(d), "=d"(len)                      \
448      : "0"(s), "1"(d), "2"(len)                         \
449      : "d0")
450
451
452 static int macscsi_pread (struct Scsi_Host *instance,
453                           unsigned char *dst, int len)
454 {
455    unsigned char *d;
456    volatile unsigned char *s;
457
458    NCR5380_local_declare();
459    NCR5380_setup(instance);
460
461    s = mac_scsi_drq+0x60;
462    d = dst;
463
464 /* These conditions are derived from MacOS */
465
466    while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) 
467          && !(NCR5380_read(STATUS_REG) & SR_REQ))
468       ;
469    if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) 
470          && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)) {
471       printk(KERN_ERR "Error in macscsi_pread\n");
472       return -1;
473    }
474
475    CP_IO_TO_MEM(s, d, len);
476    
477    if (len != 0) {
478       printk(KERN_NOTICE "Bus error in macscsi_pread\n");
479       return -1;
480    }
481    
482    return 0;
483 }
484
485
486 #define CP_MEM_TO_IO(s,d,len)                           \
487 __asm__ __volatile__                                    \
488     ("    cmp.w  #4,%2\n"                               \
489      "    bls    8f\n"                                  \
490      "    move.w %0,%%d0\n"                             \
491      "    neg.b  %%d0\n"                                \
492      "    and.w  #3,%%d0\n"                             \
493      "    sub.w  %%d0,%2\n"                             \
494      "    bra    2f\n"                                  \
495      " 1: move.b (%0)+,(%1)\n"                          \
496      " 2: dbf    %%d0,1b\n"                             \
497      "    move.w %2,%%d0\n"                             \
498      "    lsr.w  #5,%%d0\n"                             \
499      "    bra    4f\n"                                  \
500      " 3: move.l (%0)+,(%1)\n"                          \
501      "31: move.l (%0)+,(%1)\n"                          \
502      "32: move.l (%0)+,(%1)\n"                          \
503      "33: move.l (%0)+,(%1)\n"                          \
504      "34: move.l (%0)+,(%1)\n"                          \
505      "35: move.l (%0)+,(%1)\n"                          \
506      "36: move.l (%0)+,(%1)\n"                          \
507      "37: move.l (%0)+,(%1)\n"                          \
508      " 4: dbf    %%d0,3b\n"                             \
509      "    move.w %2,%%d0\n"                             \
510      "    lsr.w  #2,%%d0\n"                             \
511      "    and.w  #7,%%d0\n"                             \
512      "    bra    6f\n"                                  \
513      " 5: move.l (%0)+,(%1)\n"                          \
514      " 6: dbf    %%d0,5b\n"                             \
515      "    and.w  #3,%2\n"                               \
516      "    bra    8f\n"                                  \
517      " 7: move.b (%0)+,(%1)\n"                          \
518      " 8: dbf    %2,7b\n"                               \
519      "    moveq.l #0, %2\n"                             \
520      " 9: \n"                                           \
521      ".section .fixup,\"ax\"\n"                         \
522      "    .even\n"                                      \
523      "90: moveq.l #1, %2\n"                             \
524      "    jra 9b\n"                                     \
525      ".previous\n"                                      \
526      ".section __ex_table,\"a\"\n"                      \
527      "   .align 4\n"                                    \
528      "   .long  1b,90b\n"                               \
529      "   .long  3b,90b\n"                               \
530      "   .long 31b,90b\n"                               \
531      "   .long 32b,90b\n"                               \
532      "   .long 33b,90b\n"                               \
533      "   .long 34b,90b\n"                               \
534      "   .long 35b,90b\n"                               \
535      "   .long 36b,90b\n"                               \
536      "   .long 37b,90b\n"                               \
537      "   .long  5b,90b\n"                               \
538      "   .long  7b,90b\n"                               \
539      ".previous"                                        \
540      : "=a"(s), "=a"(d), "=d"(len)                      \
541      : "0"(s), "1"(d), "2"(len)                         \
542      : "d0")
543
544 static int macscsi_pwrite (struct Scsi_Host *instance,
545                                   unsigned char *src, int len)
546 {
547    unsigned char *s;
548    volatile unsigned char *d;
549
550    NCR5380_local_declare();
551    NCR5380_setup(instance);
552
553    s = src;
554    d = mac_scsi_drq;
555    
556 /* These conditions are derived from MacOS */
557
558    while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) 
559          && (!(NCR5380_read(STATUS_REG) & SR_REQ) 
560             || (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH))) 
561       ;
562    if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)) {
563       printk(KERN_ERR "Error in macscsi_pwrite\n");
564       return -1;
565    }
566
567    CP_MEM_TO_IO(s, d, len);   
568
569    if (len != 0) {
570       printk(KERN_NOTICE "Bus error in macscsi_pwrite\n");
571       return -1;
572    }
573    
574    return 0;
575 }
576
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         .use_clustering                 = DISABLE_CLUSTERING
595 };
596
597
598 #include "scsi_module.c"