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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
71extern void via_scsi_clear(void);
72
73#ifdef RESET_BOOT
74static void mac_scsi_reset_boot(struct Scsi_Host *instance);
75#endif
76
77static int setup_called = 0;
78static int setup_can_queue = -1;
79static int setup_cmd_per_lun = -1;
80static int setup_sg_tablesize = -1;
81static int setup_use_pdma = -1;
82#ifdef SUPPORT_TAGS
83static int setup_use_tagged_queuing = -1;
84#endif
85static 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
98static volatile unsigned char *mac_scsi_regp = NULL;
99static volatile unsigned char *mac_scsi_drq = NULL;
100static 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
111static 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
124static 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 */
136static __inline__ char macscsi_read(struct Scsi_Host *instance, int reg)
137{
138 return in_8(instance->io_port + (reg<<4));
139}
140
141static __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
157static 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
229int __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, IRQ_FLG_SLOW,
295 "ncr5380", instance)) {
296 printk(KERN_WARNING "scsi%d: IRQ%d not free, interrupts disabled\n",
297 instance->host_no, instance->irq);
298 instance->irq = SCSI_IRQ_NONE;
299 }
300
301 printk(KERN_INFO "scsi%d: generic 5380 at port %lX irq", instance->host_no, instance->io_port);
302 if (instance->irq == SCSI_IRQ_NONE)
303 printk (KERN_INFO "s disabled");
304 else
305 printk (KERN_INFO " %d", instance->irq);
306 printk(KERN_INFO " options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
307 instance->can_queue, instance->cmd_per_lun, MACSCSI_PUBLIC_RELEASE);
308 printk(KERN_INFO "\nscsi%d:", instance->host_no);
309 NCR5380_print_options(instance);
310 printk("\n");
311 called = 1;
312 return 1;
313}
314
315int macscsi_release (struct Scsi_Host *shpnt)
316{
317 if (shpnt->irq != SCSI_IRQ_NONE)
318 free_irq(shpnt->irq, shpnt);
319 NCR5380_exit(shpnt);
320
321 return 0;
322}
323
324#ifdef RESET_BOOT
325/*
326 * Our 'bus reset on boot' function
327 */
328
329static void mac_scsi_reset_boot(struct Scsi_Host *instance)
330{
331 unsigned long end;
332
333 NCR5380_local_declare();
334 NCR5380_setup(instance);
335
336 /*
337 * Do a SCSI reset to clean up the bus during initialization. No messing
338 * with the queues, interrupts, or locks necessary here.
339 */
340
341 printk(KERN_INFO "Macintosh SCSI: resetting the SCSI bus..." );
342
343 /* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */
344 disable_irq(IRQ_MAC_SCSI);
345
346 /* get in phase */
347 NCR5380_write( TARGET_COMMAND_REG,
348 PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
349
350 /* assert RST */
351 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
352 /* The min. reset hold time is 25us, so 40us should be enough */
353 udelay( 50 );
354 /* reset RST and interrupt */
355 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
356 NCR5380_read( RESET_PARITY_INTERRUPT_REG );
357
358 for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
359 barrier();
360
361 /* switch on SCSI IRQ again */
362 enable_irq(IRQ_MAC_SCSI);
363
364 printk(KERN_INFO " done\n" );
365}
366#endif
367
368const char * macscsi_info (struct Scsi_Host *spnt) {
369 return "";
370}
371
372/*
373 Pseudo-DMA: (Ove Edlund)
374 The code attempts to catch bus errors that occur if one for example
375 "trips over the cable".
376 XXX: Since bus errors in the PDMA routines never happen on my
377 computer, the bus error code is untested.
378 If the code works as intended, a bus error results in Pseudo-DMA
379 beeing disabled, meaning that the driver switches to slow handshake.
380 If bus errors are NOT extremely rare, this has to be changed.
381*/
382
383#define CP_IO_TO_MEM(s,d,len) \
384__asm__ __volatile__ \
385 (" cmp.w #4,%2\n" \
386 " bls 8f\n" \
387 " move.w %1,%%d0\n" \
388 " neg.b %%d0\n" \
389 " and.w #3,%%d0\n" \
390 " sub.w %%d0,%2\n" \
391 " bra 2f\n" \
392 " 1: move.b (%0),(%1)+\n" \
393 " 2: dbf %%d0,1b\n" \
394 " move.w %2,%%d0\n" \
395 " lsr.w #5,%%d0\n" \
396 " bra 4f\n" \
397 " 3: move.l (%0),(%1)+\n" \
398 "31: move.l (%0),(%1)+\n" \
399 "32: move.l (%0),(%1)+\n" \
400 "33: move.l (%0),(%1)+\n" \
401 "34: move.l (%0),(%1)+\n" \
402 "35: move.l (%0),(%1)+\n" \
403 "36: move.l (%0),(%1)+\n" \
404 "37: move.l (%0),(%1)+\n" \
405 " 4: dbf %%d0,3b\n" \
406 " move.w %2,%%d0\n" \
407 " lsr.w #2,%%d0\n" \
408 " and.w #7,%%d0\n" \
409 " bra 6f\n" \
410 " 5: move.l (%0),(%1)+\n" \
411 " 6: dbf %%d0,5b\n" \
412 " and.w #3,%2\n" \
413 " bra 8f\n" \
414 " 7: move.b (%0),(%1)+\n" \
415 " 8: dbf %2,7b\n" \
416 " moveq.l #0, %2\n" \
417 " 9: \n" \
418 ".section .fixup,\"ax\"\n" \
419 " .even\n" \
420 "90: moveq.l #1, %2\n" \
421 " jra 9b\n" \
422 ".previous\n" \
423 ".section __ex_table,\"a\"\n" \
424 " .align 4\n" \
425 " .long 1b,90b\n" \
426 " .long 3b,90b\n" \
427 " .long 31b,90b\n" \
428 " .long 32b,90b\n" \
429 " .long 33b,90b\n" \
430 " .long 34b,90b\n" \
431 " .long 35b,90b\n" \
432 " .long 36b,90b\n" \
433 " .long 37b,90b\n" \
434 " .long 5b,90b\n" \
435 " .long 7b,90b\n" \
436 ".previous" \
437 : "=a"(s), "=a"(d), "=d"(len) \
438 : "0"(s), "1"(d), "2"(len) \
439 : "d0")
440
441
442static int macscsi_pread (struct Scsi_Host *instance,
443 unsigned char *dst, int len)
444{
445 unsigned char *d;
446 volatile unsigned char *s;
447
448 NCR5380_local_declare();
449 NCR5380_setup(instance);
450
451 s = mac_scsi_drq+0x60;
452 d = dst;
453
454/* These conditions are derived from MacOS */
455
456 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
457 && !(NCR5380_read(STATUS_REG) & SR_REQ))
458 ;
459 if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
460 && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)) {
461 printk(KERN_ERR "Error in macscsi_pread\n");
462 return -1;
463 }
464
465 CP_IO_TO_MEM(s, d, len);
466
467 if (len != 0) {
468 printk(KERN_NOTICE "Bus error in macscsi_pread\n");
469 return -1;
470 }
471
472 return 0;
473}
474
475
476#define CP_MEM_TO_IO(s,d,len) \
477__asm__ __volatile__ \
478 (" cmp.w #4,%2\n" \
479 " bls 8f\n" \
480 " move.w %0,%%d0\n" \
481 " neg.b %%d0\n" \
482 " and.w #3,%%d0\n" \
483 " sub.w %%d0,%2\n" \
484 " bra 2f\n" \
485 " 1: move.b (%0)+,(%1)\n" \
486 " 2: dbf %%d0,1b\n" \
487 " move.w %2,%%d0\n" \
488 " lsr.w #5,%%d0\n" \
489 " bra 4f\n" \
490 " 3: move.l (%0)+,(%1)\n" \
491 "31: move.l (%0)+,(%1)\n" \
492 "32: move.l (%0)+,(%1)\n" \
493 "33: move.l (%0)+,(%1)\n" \
494 "34: move.l (%0)+,(%1)\n" \
495 "35: move.l (%0)+,(%1)\n" \
496 "36: move.l (%0)+,(%1)\n" \
497 "37: move.l (%0)+,(%1)\n" \
498 " 4: dbf %%d0,3b\n" \
499 " move.w %2,%%d0\n" \
500 " lsr.w #2,%%d0\n" \
501 " and.w #7,%%d0\n" \
502 " bra 6f\n" \
503 " 5: move.l (%0)+,(%1)\n" \
504 " 6: dbf %%d0,5b\n" \
505 " and.w #3,%2\n" \
506 " bra 8f\n" \
507 " 7: move.b (%0)+,(%1)\n" \
508 " 8: dbf %2,7b\n" \
509 " moveq.l #0, %2\n" \
510 " 9: \n" \
511 ".section .fixup,\"ax\"\n" \
512 " .even\n" \
513 "90: moveq.l #1, %2\n" \
514 " jra 9b\n" \
515 ".previous\n" \
516 ".section __ex_table,\"a\"\n" \
517 " .align 4\n" \
518 " .long 1b,90b\n" \
519 " .long 3b,90b\n" \
520 " .long 31b,90b\n" \
521 " .long 32b,90b\n" \
522 " .long 33b,90b\n" \
523 " .long 34b,90b\n" \
524 " .long 35b,90b\n" \
525 " .long 36b,90b\n" \
526 " .long 37b,90b\n" \
527 " .long 5b,90b\n" \
528 " .long 7b,90b\n" \
529 ".previous" \
530 : "=a"(s), "=a"(d), "=d"(len) \
531 : "0"(s), "1"(d), "2"(len) \
532 : "d0")
533
534static int macscsi_pwrite (struct Scsi_Host *instance,
535 unsigned char *src, int len)
536{
537 unsigned char *s;
538 volatile unsigned char *d;
539
540 NCR5380_local_declare();
541 NCR5380_setup(instance);
542
543 s = src;
544 d = mac_scsi_drq;
545
546/* These conditions are derived from MacOS */
547
548 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
549 && (!(NCR5380_read(STATUS_REG) & SR_REQ)
550 || (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)))
551 ;
552 if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)) {
553 printk(KERN_ERR "Error in macscsi_pwrite\n");
554 return -1;
555 }
556
557 CP_MEM_TO_IO(s, d, len);
558
559 if (len != 0) {
560 printk(KERN_NOTICE "Bus error in macscsi_pwrite\n");
561 return -1;
562 }
563
564 return 0;
565}
566
567
568#include "NCR5380.c"
569
570static struct scsi_host_template driver_template = {
571 .proc_name = "Mac5380",
572 .proc_info = macscsi_proc_info,
573 .name = "Macintosh NCR5380 SCSI",
574 .detect = macscsi_detect,
575 .release = macscsi_release,
576 .info = macscsi_info,
577 .queuecommand = macscsi_queue_command,
578 .eh_abort_handler = macscsi_abort,
579 .eh_bus_reset_handler = macscsi_bus_reset,
580 .can_queue = CAN_QUEUE,
581 .this_id = 7,
582 .sg_tablesize = SG_ALL,
583 .cmd_per_lun = CMD_PER_LUN,
584 .use_clustering = DISABLE_CLUSTERING
585};
586
587
588#include "scsi_module.c"
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Generic Macintosh NCR5380 driver
4 *
5 * Copyright 1998, Michael Schmitz <mschmitz@lbl.gov>
6 *
7 * Copyright 2019 Finn Thain
8 *
9 * derived in part from:
10 */
11/*
12 * Generic Generic NCR5380 driver
13 *
14 * Copyright 1995, Russell King
15 */
16
17#include <linux/delay.h>
18#include <linux/types.h>
19#include <linux/module.h>
20#include <linux/ioport.h>
21#include <linux/init.h>
22#include <linux/blkdev.h>
23#include <linux/interrupt.h>
24#include <linux/platform_device.h>
25
26#include <asm/hwtest.h>
27#include <asm/io.h>
28#include <asm/macintosh.h>
29#include <asm/macints.h>
30#include <asm/setup.h>
31
32#include <scsi/scsi_host.h>
33
34/* Definitions for the core NCR5380 driver. */
35
36#define NCR5380_implementation_fields int pdma_residual
37
38#define NCR5380_read(reg) in_8(hostdata->io + ((reg) << 4))
39#define NCR5380_write(reg, value) out_8(hostdata->io + ((reg) << 4), value)
40
41#define NCR5380_dma_xfer_len macscsi_dma_xfer_len
42#define NCR5380_dma_recv_setup macscsi_pread
43#define NCR5380_dma_send_setup macscsi_pwrite
44#define NCR5380_dma_residual macscsi_dma_residual
45
46#define NCR5380_intr macscsi_intr
47#define NCR5380_queue_command macscsi_queue_command
48#define NCR5380_abort macscsi_abort
49#define NCR5380_host_reset macscsi_host_reset
50#define NCR5380_info macscsi_info
51
52#include "NCR5380.h"
53
54static int setup_can_queue = -1;
55module_param(setup_can_queue, int, 0);
56static int setup_cmd_per_lun = -1;
57module_param(setup_cmd_per_lun, int, 0);
58static int setup_sg_tablesize = -1;
59module_param(setup_sg_tablesize, int, 0);
60static int setup_use_pdma = 512;
61module_param(setup_use_pdma, int, 0);
62static int setup_hostid = -1;
63module_param(setup_hostid, int, 0);
64static int setup_toshiba_delay = -1;
65module_param(setup_toshiba_delay, int, 0);
66
67#ifndef MODULE
68static int __init mac_scsi_setup(char *str)
69{
70 int ints[8];
71
72 (void)get_options(str, ARRAY_SIZE(ints), ints);
73
74 if (ints[0] < 1) {
75 pr_err("Usage: mac5380=<can_queue>[,<cmd_per_lun>[,<sg_tablesize>[,<hostid>[,<use_tags>[,<use_pdma>[,<toshiba_delay>]]]]]]\n");
76 return 0;
77 }
78 if (ints[0] >= 1)
79 setup_can_queue = ints[1];
80 if (ints[0] >= 2)
81 setup_cmd_per_lun = ints[2];
82 if (ints[0] >= 3)
83 setup_sg_tablesize = ints[3];
84 if (ints[0] >= 4)
85 setup_hostid = ints[4];
86 /* ints[5] (use_tagged_queuing) is ignored */
87 if (ints[0] >= 6)
88 setup_use_pdma = ints[6];
89 if (ints[0] >= 7)
90 setup_toshiba_delay = ints[7];
91 return 1;
92}
93
94__setup("mac5380=", mac_scsi_setup);
95#endif /* !MODULE */
96
97/*
98 * According to "Inside Macintosh: Devices", Mac OS requires disk drivers to
99 * specify the number of bytes between the delays expected from a SCSI target.
100 * This allows the operating system to "prevent bus errors when a target fails
101 * to deliver the next byte within the processor bus error timeout period."
102 * Linux SCSI drivers lack knowledge of the timing behaviour of SCSI targets
103 * so bus errors are unavoidable.
104 *
105 * If a MOVE.B instruction faults during a receive operation, we assume the
106 * target sent nothing and try again. That assumption probably depends on
107 * target firmware but it seems to hold up okay. If a fault happens during a
108 * send operation, the target may or may not have seen /ACK and got the byte.
109 * It's uncertain so the whole SCSI command gets retried.
110 *
111 * The NOP is needed for synchronization because the fault address in the
112 * exception stack frame may or may not be the instruction that actually
113 * caused the bus error. Post-increment addressing can't be used.
114 */
115
116#define MOVE_BYTE(operands) \
117 asm volatile ( \
118 "1: moveb " operands " \n" \
119 "11: nop \n" \
120 " addq #1,%0 \n" \
121 " subq #1,%1 \n" \
122 "40: \n" \
123 " \n" \
124 ".section .fixup,\"ax\" \n" \
125 ".even \n" \
126 "90: movel #1, %2 \n" \
127 " jra 40b \n" \
128 ".previous \n" \
129 " \n" \
130 ".section __ex_table,\"a\" \n" \
131 ".align 4 \n" \
132 ".long 1b,90b \n" \
133 ".long 11b,90b \n" \
134 ".previous \n" \
135 : "+a" (addr), "+r" (n), "+r" (result) : "a" (io))
136
137/*
138 * If a MOVE.W (or MOVE.L) instruction faults, it cannot be retried because
139 * the residual byte count would be uncertain. In that situation the MOVE_WORD
140 * macro clears n in the fixup section to abort the transfer.
141 */
142
143#define MOVE_WORD(operands) \
144 asm volatile ( \
145 "1: movew " operands " \n" \
146 "11: nop \n" \
147 " subq #2,%1 \n" \
148 "40: \n" \
149 " \n" \
150 ".section .fixup,\"ax\" \n" \
151 ".even \n" \
152 "90: movel #0, %1 \n" \
153 " movel #2, %2 \n" \
154 " jra 40b \n" \
155 ".previous \n" \
156 " \n" \
157 ".section __ex_table,\"a\" \n" \
158 ".align 4 \n" \
159 ".long 1b,90b \n" \
160 ".long 11b,90b \n" \
161 ".previous \n" \
162 : "+a" (addr), "+r" (n), "+r" (result) : "a" (io))
163
164#define MOVE_16_WORDS(operands) \
165 asm volatile ( \
166 "1: movew " operands " \n" \
167 "2: movew " operands " \n" \
168 "3: movew " operands " \n" \
169 "4: movew " operands " \n" \
170 "5: movew " operands " \n" \
171 "6: movew " operands " \n" \
172 "7: movew " operands " \n" \
173 "8: movew " operands " \n" \
174 "9: movew " operands " \n" \
175 "10: movew " operands " \n" \
176 "11: movew " operands " \n" \
177 "12: movew " operands " \n" \
178 "13: movew " operands " \n" \
179 "14: movew " operands " \n" \
180 "15: movew " operands " \n" \
181 "16: movew " operands " \n" \
182 "17: nop \n" \
183 " subl #32,%1 \n" \
184 "40: \n" \
185 " \n" \
186 ".section .fixup,\"ax\" \n" \
187 ".even \n" \
188 "90: movel #0, %1 \n" \
189 " movel #2, %2 \n" \
190 " jra 40b \n" \
191 ".previous \n" \
192 " \n" \
193 ".section __ex_table,\"a\" \n" \
194 ".align 4 \n" \
195 ".long 1b,90b \n" \
196 ".long 2b,90b \n" \
197 ".long 3b,90b \n" \
198 ".long 4b,90b \n" \
199 ".long 5b,90b \n" \
200 ".long 6b,90b \n" \
201 ".long 7b,90b \n" \
202 ".long 8b,90b \n" \
203 ".long 9b,90b \n" \
204 ".long 10b,90b \n" \
205 ".long 11b,90b \n" \
206 ".long 12b,90b \n" \
207 ".long 13b,90b \n" \
208 ".long 14b,90b \n" \
209 ".long 15b,90b \n" \
210 ".long 16b,90b \n" \
211 ".long 17b,90b \n" \
212 ".previous \n" \
213 : "+a" (addr), "+r" (n), "+r" (result) : "a" (io))
214
215static inline int mac_pdma_recv(void __iomem *io, unsigned char *start, int n)
216{
217 unsigned char *addr = start;
218 int result = 0;
219
220 if (n >= 1) {
221 MOVE_BYTE("%3@,%0@");
222 if (result)
223 goto out;
224 }
225 if (n >= 1 && ((unsigned long)addr & 1)) {
226 MOVE_BYTE("%3@,%0@");
227 if (result)
228 goto out;
229 }
230 while (n >= 32)
231 MOVE_16_WORDS("%3@,%0@+");
232 while (n >= 2)
233 MOVE_WORD("%3@,%0@+");
234 if (result)
235 return start - addr; /* Negated to indicate uncertain length */
236 if (n == 1)
237 MOVE_BYTE("%3@,%0@");
238out:
239 return addr - start;
240}
241
242static inline int mac_pdma_send(unsigned char *start, void __iomem *io, int n)
243{
244 unsigned char *addr = start;
245 int result = 0;
246
247 if (n >= 1) {
248 MOVE_BYTE("%0@,%3@");
249 if (result)
250 return -1;
251 }
252 if (n >= 1 && ((unsigned long)addr & 1)) {
253 MOVE_BYTE("%0@,%3@");
254 if (result)
255 return -2;
256 }
257 while (n >= 32)
258 MOVE_16_WORDS("%0@+,%3@");
259 while (n >= 2)
260 MOVE_WORD("%0@+,%3@");
261 if (result)
262 return start - addr - 1; /* Negated to indicate uncertain length */
263 if (n == 1)
264 MOVE_BYTE("%0@,%3@");
265 return addr - start;
266}
267
268/* The "SCSI DMA" chip on the IIfx implements this register. */
269#define CTRL_REG 0x8
270#define CTRL_INTERRUPTS_ENABLE BIT(1)
271#define CTRL_HANDSHAKE_MODE BIT(3)
272
273static inline void write_ctrl_reg(struct NCR5380_hostdata *hostdata, u32 value)
274{
275 out_be32(hostdata->io + (CTRL_REG << 4), value);
276}
277
278static inline int macscsi_wait_for_drq(struct NCR5380_hostdata *hostdata)
279{
280 unsigned int n = 1; /* effectively multiplies NCR5380_REG_POLL_TIME */
281 unsigned char basr;
282
283again:
284 basr = NCR5380_read(BUS_AND_STATUS_REG);
285
286 if (!(basr & BASR_PHASE_MATCH))
287 return 1;
288
289 if (basr & BASR_IRQ)
290 return -1;
291
292 if (basr & BASR_DRQ)
293 return 0;
294
295 if (n-- == 0) {
296 NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
297 dsprintk(NDEBUG_PSEUDO_DMA, hostdata->host,
298 "%s: DRQ timeout\n", __func__);
299 return -1;
300 }
301
302 NCR5380_poll_politely2(hostdata,
303 BUS_AND_STATUS_REG, BASR_DRQ, BASR_DRQ,
304 BUS_AND_STATUS_REG, BASR_PHASE_MATCH, 0, 0);
305 goto again;
306}
307
308static inline int macscsi_pread(struct NCR5380_hostdata *hostdata,
309 unsigned char *dst, int len)
310{
311 u8 __iomem *s = hostdata->pdma_io + (INPUT_DATA_REG << 4);
312 unsigned char *d = dst;
313
314 hostdata->pdma_residual = len;
315
316 while (macscsi_wait_for_drq(hostdata) == 0) {
317 int bytes, chunk_bytes;
318
319 if (macintosh_config->ident == MAC_MODEL_IIFX)
320 write_ctrl_reg(hostdata, CTRL_HANDSHAKE_MODE |
321 CTRL_INTERRUPTS_ENABLE);
322
323 chunk_bytes = min(hostdata->pdma_residual, 512);
324 bytes = mac_pdma_recv(s, d, chunk_bytes);
325
326 if (macintosh_config->ident == MAC_MODEL_IIFX)
327 write_ctrl_reg(hostdata, CTRL_INTERRUPTS_ENABLE);
328
329 if (bytes > 0) {
330 d += bytes;
331 hostdata->pdma_residual -= bytes;
332 }
333
334 if (hostdata->pdma_residual == 0)
335 break;
336
337 if (bytes > 0)
338 continue;
339
340 NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
341 dsprintk(NDEBUG_PSEUDO_DMA, hostdata->host,
342 "%s: bus error [%d/%d] (%d/%d)\n",
343 __func__, d - dst, len, bytes, chunk_bytes);
344
345 if (bytes == 0)
346 continue;
347
348 if (macscsi_wait_for_drq(hostdata) <= 0)
349 set_host_byte(hostdata->connected, DID_ERROR);
350 break;
351 }
352
353 return 0;
354}
355
356static inline int macscsi_pwrite(struct NCR5380_hostdata *hostdata,
357 unsigned char *src, int len)
358{
359 unsigned char *s = src;
360 u8 __iomem *d = hostdata->pdma_io + (OUTPUT_DATA_REG << 4);
361
362 hostdata->pdma_residual = len;
363
364 while (macscsi_wait_for_drq(hostdata) == 0) {
365 int bytes, chunk_bytes;
366
367 if (macintosh_config->ident == MAC_MODEL_IIFX)
368 write_ctrl_reg(hostdata, CTRL_HANDSHAKE_MODE |
369 CTRL_INTERRUPTS_ENABLE);
370
371 chunk_bytes = min(hostdata->pdma_residual, 512);
372 bytes = mac_pdma_send(s, d, chunk_bytes);
373
374 if (macintosh_config->ident == MAC_MODEL_IIFX)
375 write_ctrl_reg(hostdata, CTRL_INTERRUPTS_ENABLE);
376
377 if (bytes > 0) {
378 s += bytes;
379 hostdata->pdma_residual -= bytes;
380 }
381
382 if (hostdata->pdma_residual == 0)
383 break;
384
385 if (bytes > 0)
386 continue;
387
388 NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
389 dsprintk(NDEBUG_PSEUDO_DMA, hostdata->host,
390 "%s: bus error [%d/%d] (%d/%d)\n",
391 __func__, s - src, len, bytes, chunk_bytes);
392
393 if (bytes == 0)
394 continue;
395
396 if (macscsi_wait_for_drq(hostdata) <= 0)
397 set_host_byte(hostdata->connected, DID_ERROR);
398 break;
399 }
400
401 return 0;
402}
403
404static int macscsi_dma_xfer_len(struct NCR5380_hostdata *hostdata,
405 struct scsi_cmnd *cmd)
406{
407 int resid = NCR5380_to_ncmd(cmd)->this_residual;
408
409 if (hostdata->flags & FLAG_NO_PSEUDO_DMA || resid < setup_use_pdma)
410 return 0;
411
412 return resid;
413}
414
415static int macscsi_dma_residual(struct NCR5380_hostdata *hostdata)
416{
417 return hostdata->pdma_residual;
418}
419
420#include "NCR5380.c"
421
422#define DRV_MODULE_NAME "mac_scsi"
423#define PFX DRV_MODULE_NAME ": "
424
425static struct scsi_host_template mac_scsi_template = {
426 .module = THIS_MODULE,
427 .proc_name = DRV_MODULE_NAME,
428 .name = "Macintosh NCR5380 SCSI",
429 .info = macscsi_info,
430 .queuecommand = macscsi_queue_command,
431 .eh_abort_handler = macscsi_abort,
432 .eh_host_reset_handler = macscsi_host_reset,
433 .can_queue = 16,
434 .this_id = 7,
435 .sg_tablesize = SG_ALL,
436 .cmd_per_lun = 2,
437 .dma_boundary = PAGE_SIZE - 1,
438 .cmd_size = sizeof(struct NCR5380_cmd),
439 .max_sectors = 128,
440};
441
442static int __init mac_scsi_probe(struct platform_device *pdev)
443{
444 struct Scsi_Host *instance;
445 struct NCR5380_hostdata *hostdata;
446 int error;
447 int host_flags = 0;
448 struct resource *irq, *pio_mem, *pdma_mem = NULL;
449
450 pio_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
451 if (!pio_mem)
452 return -ENODEV;
453
454 pdma_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
455
456 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
457
458 if (!hwreg_present((unsigned char *)pio_mem->start +
459 (STATUS_REG << 4))) {
460 pr_info(PFX "no device detected at %pap\n", &pio_mem->start);
461 return -ENODEV;
462 }
463
464 if (setup_can_queue > 0)
465 mac_scsi_template.can_queue = setup_can_queue;
466 if (setup_cmd_per_lun > 0)
467 mac_scsi_template.cmd_per_lun = setup_cmd_per_lun;
468 if (setup_sg_tablesize > 0)
469 mac_scsi_template.sg_tablesize = setup_sg_tablesize;
470 if (setup_hostid >= 0)
471 mac_scsi_template.this_id = setup_hostid & 7;
472
473 if (macintosh_config->ident == MAC_MODEL_IIFX)
474 mac_scsi_template.sg_tablesize = 1;
475
476 instance = scsi_host_alloc(&mac_scsi_template,
477 sizeof(struct NCR5380_hostdata));
478 if (!instance)
479 return -ENOMEM;
480
481 if (irq)
482 instance->irq = irq->start;
483 else
484 instance->irq = NO_IRQ;
485
486 hostdata = shost_priv(instance);
487 hostdata->base = pio_mem->start;
488 hostdata->io = (u8 __iomem *)pio_mem->start;
489
490 if (pdma_mem && setup_use_pdma)
491 hostdata->pdma_io = (u8 __iomem *)pdma_mem->start;
492 else
493 host_flags |= FLAG_NO_PSEUDO_DMA;
494
495 host_flags |= setup_toshiba_delay > 0 ? FLAG_TOSHIBA_DELAY : 0;
496
497 if (instance->sg_tablesize > 1)
498 host_flags |= FLAG_DMA_FIXUP;
499
500 error = NCR5380_init(instance, host_flags | FLAG_LATE_DMA_SETUP);
501 if (error)
502 goto fail_init;
503
504 if (instance->irq != NO_IRQ) {
505 error = request_irq(instance->irq, macscsi_intr, IRQF_SHARED,
506 "NCR5380", instance);
507 if (error)
508 goto fail_irq;
509 }
510
511 NCR5380_maybe_reset_bus(instance);
512
513 error = scsi_add_host(instance, NULL);
514 if (error)
515 goto fail_host;
516
517 platform_set_drvdata(pdev, instance);
518
519 scsi_scan_host(instance);
520 return 0;
521
522fail_host:
523 if (instance->irq != NO_IRQ)
524 free_irq(instance->irq, instance);
525fail_irq:
526 NCR5380_exit(instance);
527fail_init:
528 scsi_host_put(instance);
529 return error;
530}
531
532static void __exit mac_scsi_remove(struct platform_device *pdev)
533{
534 struct Scsi_Host *instance = platform_get_drvdata(pdev);
535
536 scsi_remove_host(instance);
537 if (instance->irq != NO_IRQ)
538 free_irq(instance->irq, instance);
539 NCR5380_exit(instance);
540 scsi_host_put(instance);
541}
542
543/*
544 * mac_scsi_remove() lives in .exit.text. For drivers registered via
545 * module_platform_driver_probe() this is ok because they cannot get unbound at
546 * runtime. So mark the driver struct with __refdata to prevent modpost
547 * triggering a section mismatch warning.
548 */
549static struct platform_driver mac_scsi_driver __refdata = {
550 .remove = __exit_p(mac_scsi_remove),
551 .driver = {
552 .name = DRV_MODULE_NAME,
553 },
554};
555
556module_platform_driver_probe(mac_scsi_driver, mac_scsi_probe);
557
558MODULE_ALIAS("platform:" DRV_MODULE_NAME);
559MODULE_DESCRIPTION("Macintosh NCR5380 SCSI driver");
560MODULE_LICENSE("GPL");