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Merge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending
[linux/fpc-iii.git] / drivers / scsi / arm / acornscsi.c
blobdeaaf84989cd15d9ea4a306828e03623b364ccec
1 /*
2 * linux/drivers/acorn/scsi/acornscsi.c
3 *
4 * Acorn SCSI 3 driver
5 * By R.M.King.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * Abandoned using the Select and Transfer command since there were
12 * some nasty races between our software and the target devices that
13 * were not easy to solve, and the device errata had a lot of entries
14 * for this command, some of them quite nasty...
15 *
16 * Changelog:
17 * 26-Sep-1997 RMK Re-jigged to use the queue module.
18 * Re-coded state machine to be based on driver
19 * state not scsi state. Should be easier to debug.
20 * Added acornscsi_release to clean up properly.
21 * Updated proc/scsi reporting.
22 * 05-Oct-1997 RMK Implemented writing to SCSI devices.
23 * 06-Oct-1997 RMK Corrected small (non-serious) bug with the connect/
24 * reconnect race condition causing a warning message.
25 * 12-Oct-1997 RMK Added catch for re-entering interrupt routine.
26 * 15-Oct-1997 RMK Improved handling of commands.
27 * 27-Jun-1998 RMK Changed asm/delay.h to linux/delay.h.
28 * 13-Dec-1998 RMK Better abort code and command handling. Extra state
29 * transitions added to allow dodgy devices to work.
30 */
31 #define DEBUG_NO_WRITE 1
32 #define DEBUG_QUEUES 2
33 #define DEBUG_DMA 4
34 #define DEBUG_ABORT 8
35 #define DEBUG_DISCON 16
36 #define DEBUG_CONNECT 32
37 #define DEBUG_PHASES 64
38 #define DEBUG_WRITE 128
39 #define DEBUG_LINK 256
40 #define DEBUG_MESSAGES 512
41 #define DEBUG_RESET 1024
42 #define DEBUG_ALL (DEBUG_RESET|DEBUG_MESSAGES|DEBUG_LINK|DEBUG_WRITE|\
43 DEBUG_PHASES|DEBUG_CONNECT|DEBUG_DISCON|DEBUG_ABORT|\
44 DEBUG_DMA|DEBUG_QUEUES)
45
46 /* DRIVER CONFIGURATION
47 *
48 * SCSI-II Tagged queue support.
49 *
50 * I don't have any SCSI devices that support it, so it is totally untested
51 * (except to make sure that it doesn't interfere with any non-tagging
52 * devices). It is not fully implemented either - what happens when a
53 * tagging device reconnects???
54 *
55 * You can tell if you have a device that supports tagged queueing my
56 * cating (eg) /proc/scsi/acornscsi/0 and see if the SCSI revision is reported
57 * as '2 TAG'.
58 *
59 * Also note that CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE is normally set in the config
60 * scripts, but disabled here. Once debugged, remove the #undef, otherwise to debug,
61 * comment out the undef.
62 */
63 #undef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
64 /*
65 * SCSI-II Synchronous transfer support.
66 *
67 * Tried and tested...
68 *
69 * SDTR_SIZE - maximum number of un-acknowledged bytes (0 = off, 12 = max)
70 * SDTR_PERIOD - period of REQ signal (min=125, max=1020)
71 * DEFAULT_PERIOD - default REQ period.
72 */
73 #define SDTR_SIZE 12
74 #define SDTR_PERIOD 125
75 #define DEFAULT_PERIOD 500
76
77 /*
78 * Debugging information
79 *
80 * DEBUG - bit mask from list above
81 * DEBUG_TARGET - is defined to the target number if you want to debug
82 * a specific target. [only recon/write/dma].
83 */
84 #define DEBUG (DEBUG_RESET|DEBUG_WRITE|DEBUG_NO_WRITE)
85 /* only allow writing to SCSI device 0 */
86 #define NO_WRITE 0xFE
87 /*#define DEBUG_TARGET 2*/
88 /*
89 * Select timeout time (in 10ms units)
90 *
91 * This is the timeout used between the start of selection and the WD33C93
92 * chip deciding that the device isn't responding.
93 */
94 #define TIMEOUT_TIME 10
95 /*
96 * Define this if you want to have verbose explanation of SCSI
97 * status/messages.
98 */
99 #undef CONFIG_ACORNSCSI_CONSTANTS
100 /*
101 * Define this if you want to use the on board DMAC [don't remove this option]
102 * If not set, then use PIO mode (not currently supported).
103 */
104 #define USE_DMAC
105
106 /*
107 * ====================================================================================
108 */
109
110 #ifdef DEBUG_TARGET
111 #define DBG(cmd,xxx...) \
112 if (cmd->device->id == DEBUG_TARGET) { \
113 xxx; \
114 }
115 #else
116 #define DBG(cmd,xxx...) xxx
117 #endif
118
119 #include <linux/module.h>
120 #include <linux/kernel.h>
121 #include <linux/string.h>
122 #include <linux/signal.h>
123 #include <linux/errno.h>
124 #include <linux/proc_fs.h>
125 #include <linux/ioport.h>
126 #include <linux/blkdev.h>
127 #include <linux/delay.h>
128 #include <linux/interrupt.h>
129 #include <linux/init.h>
130 #include <linux/bitops.h>
131 #include <linux/stringify.h>
132 #include <linux/io.h>
133
134 #include <asm/ecard.h>
135
136 #include "../scsi.h"
137 #include <scsi/scsi_dbg.h>
138 #include <scsi/scsi_host.h>
139 #include <scsi/scsi_transport_spi.h>
140 #include "acornscsi.h"
141 #include "msgqueue.h"
142 #include "scsi.h"
143
144 #include <scsi/scsicam.h>
145
146 #define VER_MAJOR 2
147 #define VER_MINOR 0
148 #define VER_PATCH 6
149
150 #ifndef ABORT_TAG
151 #define ABORT_TAG 0xd
152 #else
153 #error "Yippee! ABORT TAG is now defined! Remove this error!"
154 #endif
155
156 #ifdef USE_DMAC
157 /*
158 * DMAC setup parameters
159 */
160 #define INIT_DEVCON0 (DEVCON0_RQL|DEVCON0_EXW|DEVCON0_CMP)
161 #define INIT_DEVCON1 (DEVCON1_BHLD)
162 #define DMAC_READ (MODECON_READ)
163 #define DMAC_WRITE (MODECON_WRITE)
164 #define INIT_SBICDMA (CTRL_DMABURST)
165
166 #define scsi_xferred have_data_in
167
168 /*
169 * Size of on-board DMA buffer
170 */
171 #define DMAC_BUFFER_SIZE 65536
172 #endif
173
174 #define STATUS_BUFFER_TO_PRINT 24
175
176 unsigned int sdtr_period = SDTR_PERIOD;
177 unsigned int sdtr_size = SDTR_SIZE;
178
179 static void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp,
180 unsigned int result);
181 static int acornscsi_reconnect_finish(AS_Host *host);
182 static void acornscsi_dma_cleanup(AS_Host *host);
183 static void acornscsi_abortcmd(AS_Host *host, unsigned char tag);
184
185 /* ====================================================================================
186 * Miscellaneous
187 */
188
189 /* Offsets from MEMC base */
190 #define SBIC_REGIDX 0x2000
191 #define SBIC_REGVAL 0x2004
192 #define DMAC_OFFSET 0x3000
193
194 /* Offsets from FAST IOC base */
195 #define INT_REG 0x2000
196 #define PAGE_REG 0x3000
197
198 static inline void sbic_arm_write(AS_Host *host, unsigned int reg, unsigned int value)
199 {
200 writeb(reg, host->base + SBIC_REGIDX);
201 writeb(value, host->base + SBIC_REGVAL);
202 }
203
204 static inline int sbic_arm_read(AS_Host *host, unsigned int reg)
205 {
206 if(reg == SBIC_ASR)
207 return readl(host->base + SBIC_REGIDX) & 255;
208 writeb(reg, host->base + SBIC_REGIDX);
209 return readl(host->base + SBIC_REGVAL) & 255;
210 }
211
212 #define sbic_arm_writenext(host, val) writeb((val), (host)->base + SBIC_REGVAL)
213 #define sbic_arm_readnext(host) readb((host)->base + SBIC_REGVAL)
214
215 #ifdef USE_DMAC
216 #define dmac_read(host,reg) \
217 readb((host)->base + DMAC_OFFSET + ((reg) << 2))
218
219 #define dmac_write(host,reg,value) \
220 ({ writeb((value), (host)->base + DMAC_OFFSET + ((reg) << 2)); })
221
222 #define dmac_clearintr(host) writeb(0, (host)->fast + INT_REG)
223
224 static inline unsigned int dmac_address(AS_Host *host)
225 {
226 return dmac_read(host, DMAC_TXADRHI) << 16 |
227 dmac_read(host, DMAC_TXADRMD) << 8 |
228 dmac_read(host, DMAC_TXADRLO);
229 }
230
231 static
232 void acornscsi_dumpdma(AS_Host *host, char *where)
233 {
234 unsigned int mode, addr, len;
235
236 mode = dmac_read(host, DMAC_MODECON);
237 addr = dmac_address(host);
238 len = dmac_read(host, DMAC_TXCNTHI) << 8 |
239 dmac_read(host, DMAC_TXCNTLO);
240
241 printk("scsi%d: %s: DMAC %02x @%06x+%04x msk %02x, ",
242 host->host->host_no, where,
243 mode, addr, (len + 1) & 0xffff,
244 dmac_read(host, DMAC_MASKREG));
245
246 printk("DMA @%06x, ", host->dma.start_addr);
247 printk("BH @%p +%04x, ", host->scsi.SCp.ptr,
248 host->scsi.SCp.this_residual);
249 printk("DT @+%04x ST @+%04x", host->dma.transferred,
250 host->scsi.SCp.scsi_xferred);
251 printk("\n");
252 }
253 #endif
254
255 static
256 unsigned long acornscsi_sbic_xfcount(AS_Host *host)
257 {
258 unsigned long length;
259
260 length = sbic_arm_read(host, SBIC_TRANSCNTH) << 16;
261 length |= sbic_arm_readnext(host) << 8;
262 length |= sbic_arm_readnext(host);
263
264 return length;
265 }
266
267 static int
268 acornscsi_sbic_wait(AS_Host *host, int stat_mask, int stat, int timeout, char *msg)
269 {
270 int asr;
271
272 do {
273 asr = sbic_arm_read(host, SBIC_ASR);
274
275 if ((asr & stat_mask) == stat)
276 return 0;
277
278 udelay(1);
279 } while (--timeout);
280
281 printk("scsi%d: timeout while %s\n", host->host->host_no, msg);
282
283 return -1;
284 }
285
286 static
287 int acornscsi_sbic_issuecmd(AS_Host *host, int command)
288 {
289 if (acornscsi_sbic_wait(host, ASR_CIP, 0, 1000, "issuing command"))
290 return -1;
291
292 sbic_arm_write(host, SBIC_CMND, command);
293
294 return 0;
295 }
296
297 static void
298 acornscsi_csdelay(unsigned int cs)
299 {
300 unsigned long target_jiffies, flags;
301
302 target_jiffies = jiffies + 1 + cs * HZ / 100;
303
304 local_save_flags(flags);
305 local_irq_enable();
306
307 while (time_before(jiffies, target_jiffies)) barrier();
308
309 local_irq_restore(flags);
310 }
311
312 static
313 void acornscsi_resetcard(AS_Host *host)
314 {
315 unsigned int i, timeout;
316
317 /* assert reset line */
318 host->card.page_reg = 0x80;
319 writeb(host->card.page_reg, host->fast + PAGE_REG);
320
321 /* wait 3 cs. SCSI standard says 25ms. */
322 acornscsi_csdelay(3);
323
324 host->card.page_reg = 0;
325 writeb(host->card.page_reg, host->fast + PAGE_REG);
326
327 /*
328 * Should get a reset from the card
329 */
330 timeout = 1000;
331 do {
332 if (readb(host->fast + INT_REG) & 8)
333 break;
334 udelay(1);
335 } while (--timeout);
336
337 if (timeout == 0)
338 printk("scsi%d: timeout while resetting card\n",
339 host->host->host_no);
340
341 sbic_arm_read(host, SBIC_ASR);
342 sbic_arm_read(host, SBIC_SSR);
343
344 /* setup sbic - WD33C93A */
345 sbic_arm_write(host, SBIC_OWNID, OWNID_EAF | host->host->this_id);
346 sbic_arm_write(host, SBIC_CMND, CMND_RESET);
347
348 /*
349 * Command should cause a reset interrupt
350 */
351 timeout = 1000;
352 do {
353 if (readb(host->fast + INT_REG) & 8)
354 break;
355 udelay(1);
356 } while (--timeout);
357
358 if (timeout == 0)
359 printk("scsi%d: timeout while resetting card\n",
360 host->host->host_no);
361
362 sbic_arm_read(host, SBIC_ASR);
363 if (sbic_arm_read(host, SBIC_SSR) != 0x01)
364 printk(KERN_CRIT "scsi%d: WD33C93A didn't give enhanced reset interrupt\n",
365 host->host->host_no);
366
367 sbic_arm_write(host, SBIC_CTRL, INIT_SBICDMA | CTRL_IDI);
368 sbic_arm_write(host, SBIC_TIMEOUT, TIMEOUT_TIME);
369 sbic_arm_write(host, SBIC_SYNCHTRANSFER, SYNCHTRANSFER_2DBA);
370 sbic_arm_write(host, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP);
371
372 host->card.page_reg = 0x40;
373 writeb(host->card.page_reg, host->fast + PAGE_REG);
374
375 /* setup dmac - uPC71071 */
376 dmac_write(host, DMAC_INIT, 0);
377 #ifdef USE_DMAC
378 dmac_write(host, DMAC_INIT, INIT_8BIT);
379 dmac_write(host, DMAC_CHANNEL, CHANNEL_0);
380 dmac_write(host, DMAC_DEVCON0, INIT_DEVCON0);
381 dmac_write(host, DMAC_DEVCON1, INIT_DEVCON1);
382 #endif
383
384 host->SCpnt = NULL;
385 host->scsi.phase = PHASE_IDLE;
386 host->scsi.disconnectable = 0;
387
388 memset(host->busyluns, 0, sizeof(host->busyluns));
389
390 for (i = 0; i < 8; i++) {
391 host->device[i].sync_state = SYNC_NEGOCIATE;
392 host->device[i].disconnect_ok = 1;
393 }
394
395 /* wait 25 cs. SCSI standard says 250ms. */
396 acornscsi_csdelay(25);
397 }
398
399 /*=============================================================================================
400 * Utility routines (eg. debug)
401 */
402 #ifdef CONFIG_ACORNSCSI_CONSTANTS
403 static char *acornscsi_interrupttype[] = {
404 "rst", "suc", "p/a", "3",
405 "term", "5", "6", "7",
406 "serv", "9", "a", "b",
407 "c", "d", "e", "f"
408 };
409
410 static signed char acornscsi_map[] = {
411 0, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
412 -1, 2, -1, -1, -1, -1, 3, -1, 4, 5, 6, 7, 8, 9, 10, 11,
413 12, 13, 14, -1, -1, -1, -1, -1, 4, 5, 6, 7, 8, 9, 10, 11,
414 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
415 15, 16, 17, 18, 19, -1, -1, 20, 4, 5, 6, 7, 8, 9, 10, 11,
416 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
417 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
418 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
419 21, 22, -1, -1, -1, 23, -1, -1, 4, 5, 6, 7, 8, 9, 10, 11,
420 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
421 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
422 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
423 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
424 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
425 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
426 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
427 };
428
429 static char *acornscsi_interruptcode[] = {
430 /* 0 */
431 "reset - normal mode", /* 00 */
432 "reset - advanced mode", /* 01 */
433
434 /* 2 */
435 "sel", /* 11 */
436 "sel+xfer", /* 16 */
437 "data-out", /* 18 */
438 "data-in", /* 19 */
439 "cmd", /* 1A */
440 "stat", /* 1B */
441 "??-out", /* 1C */
442 "??-in", /* 1D */
443 "msg-out", /* 1E */
444 "msg-in", /* 1F */
445
446 /* 12 */
447 "/ACK asserted", /* 20 */
448 "save-data-ptr", /* 21 */
449 "{re}sel", /* 22 */
450
451 /* 15 */
452 "inv cmd", /* 40 */
453 "unexpected disconnect", /* 41 */
454 "sel timeout", /* 42 */
455 "P err", /* 43 */
456 "P err+ATN", /* 44 */
457 "bad status byte", /* 47 */
458
459 /* 21 */
460 "resel, no id", /* 80 */
461 "resel", /* 81 */
462 "discon", /* 85 */
463 };
464
465 static
466 void print_scsi_status(unsigned int ssr)
467 {
468 if (acornscsi_map[ssr] != -1)
469 printk("%s:%s",
470 acornscsi_interrupttype[(ssr >> 4)],
471 acornscsi_interruptcode[acornscsi_map[ssr]]);
472 else
473 printk("%X:%X", ssr >> 4, ssr & 0x0f);
474 }
475 #endif
476
477 static
478 void print_sbic_status(int asr, int ssr, int cmdphase)
479 {
480 #ifdef CONFIG_ACORNSCSI_CONSTANTS
481 printk("sbic: %c%c%c%c%c%c ",
482 asr & ASR_INT ? 'I' : 'i',
483 asr & ASR_LCI ? 'L' : 'l',
484 asr & ASR_BSY ? 'B' : 'b',
485 asr & ASR_CIP ? 'C' : 'c',
486 asr & ASR_PE ? 'P' : 'p',
487 asr & ASR_DBR ? 'D' : 'd');
488 printk("scsi: ");
489 print_scsi_status(ssr);
490 printk(" ph %02X\n", cmdphase);
491 #else
492 printk("sbic: %02X scsi: %X:%X ph: %02X\n",
493 asr, (ssr & 0xf0)>>4, ssr & 0x0f, cmdphase);
494 #endif
495 }
496
497 static void
498 acornscsi_dumplogline(AS_Host *host, int target, int line)
499 {
500 unsigned long prev;
501 signed int ptr;
502
503 ptr = host->status_ptr[target] - STATUS_BUFFER_TO_PRINT;
504 if (ptr < 0)
505 ptr += STATUS_BUFFER_SIZE;
506
507 printk("%c: %3s:", target == 8 ? 'H' : '0' + target,
508 line == 0 ? "ph" : line == 1 ? "ssr" : "int");
509
510 prev = host->status[target][ptr].when;
511
512 for (; ptr != host->status_ptr[target]; ptr = (ptr + 1) & (STATUS_BUFFER_SIZE - 1)) {
513 unsigned long time_diff;
514
515 if (!host->status[target][ptr].when)
516 continue;
517
518 switch (line) {
519 case 0:
520 printk("%c%02X", host->status[target][ptr].irq ? '-' : ' ',
521 host->status[target][ptr].ph);
522 break;
523
524 case 1:
525 printk(" %02X", host->status[target][ptr].ssr);
526 break;
527
528 case 2:
529 time_diff = host->status[target][ptr].when - prev;
530 prev = host->status[target][ptr].when;
531 if (time_diff == 0)
532 printk("==^");
533 else if (time_diff >= 100)
534 printk(" ");
535 else
536 printk(" %02ld", time_diff);
537 break;
538 }
539 }
540
541 printk("\n");
542 }
543
544 static
545 void acornscsi_dumplog(AS_Host *host, int target)
546 {
547 do {
548 acornscsi_dumplogline(host, target, 0);
549 acornscsi_dumplogline(host, target, 1);
550 acornscsi_dumplogline(host, target, 2);
551
552 if (target == 8)
553 break;
554
555 target = 8;
556 } while (1);
557 }
558
559 static
560 char acornscsi_target(AS_Host *host)
561 {
562 if (host->SCpnt)
563 return '0' + host->SCpnt->device->id;
564 return 'H';
565 }
566
567 /*
568 * Prototype: cmdtype_t acornscsi_cmdtype(int command)
569 * Purpose : differentiate READ from WRITE from other commands
570 * Params : command - command to interpret
571 * Returns : CMD_READ - command reads data,
572 * CMD_WRITE - command writes data,
573 * CMD_MISC - everything else
574 */
575 static inline
576 cmdtype_t acornscsi_cmdtype(int command)
577 {
578 switch (command) {
579 case WRITE_6: case WRITE_10: case WRITE_12:
580 return CMD_WRITE;
581 case READ_6: case READ_10: case READ_12:
582 return CMD_READ;
583 default:
584 return CMD_MISC;
585 }
586 }
587
588 /*
589 * Prototype: int acornscsi_datadirection(int command)
590 * Purpose : differentiate between commands that have a DATA IN phase
591 * and a DATA OUT phase
592 * Params : command - command to interpret
593 * Returns : DATADIR_OUT - data out phase expected
594 * DATADIR_IN - data in phase expected
595 */
596 static
597 datadir_t acornscsi_datadirection(int command)
598 {
599 switch (command) {
600 case CHANGE_DEFINITION: case COMPARE: case COPY:
601 case COPY_VERIFY: case LOG_SELECT: case MODE_SELECT:
602 case MODE_SELECT_10: case SEND_DIAGNOSTIC: case WRITE_BUFFER:
603 case FORMAT_UNIT: case REASSIGN_BLOCKS: case RESERVE:
604 case SEARCH_EQUAL: case SEARCH_HIGH: case SEARCH_LOW:
605 case WRITE_6: case WRITE_10: case WRITE_VERIFY:
606 case UPDATE_BLOCK: case WRITE_LONG: case WRITE_SAME:
607 case SEARCH_HIGH_12: case SEARCH_EQUAL_12: case SEARCH_LOW_12:
608 case WRITE_12: case WRITE_VERIFY_12: case SET_WINDOW:
609 case MEDIUM_SCAN: case SEND_VOLUME_TAG: case 0xea:
610 return DATADIR_OUT;
611 default:
612 return DATADIR_IN;
613 }
614 }
615
616 /*
617 * Purpose : provide values for synchronous transfers with 33C93.
618 * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting
619 * Modified by Russell King for 8MHz WD33C93A
620 */
621 static struct sync_xfer_tbl {
622 unsigned int period_ns;
623 unsigned char reg_value;
624 } sync_xfer_table[] = {
625 { 1, 0x20 }, { 249, 0x20 }, { 374, 0x30 },
626 { 499, 0x40 }, { 624, 0x50 }, { 749, 0x60 },
627 { 874, 0x70 }, { 999, 0x00 }, { 0, 0 }
628 };
629
630 /*
631 * Prototype: int acornscsi_getperiod(unsigned char syncxfer)
632 * Purpose : period for the synchronous transfer setting
633 * Params : syncxfer SYNCXFER register value
634 * Returns : period in ns.
635 */
636 static
637 int acornscsi_getperiod(unsigned char syncxfer)
638 {
639 int i;
640
641 syncxfer &= 0xf0;
642 if (syncxfer == 0x10)
643 syncxfer = 0;
644
645 for (i = 1; sync_xfer_table[i].period_ns; i++)
646 if (syncxfer == sync_xfer_table[i].reg_value)
647 return sync_xfer_table[i].period_ns;
648 return 0;
649 }
650
651 /*
652 * Prototype: int round_period(unsigned int period)
653 * Purpose : return index into above table for a required REQ period
654 * Params : period - time (ns) for REQ
655 * Returns : table index
656 * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting
657 */
658 static inline
659 int round_period(unsigned int period)
660 {
661 int i;
662
663 for (i = 1; sync_xfer_table[i].period_ns; i++) {
664 if ((period <= sync_xfer_table[i].period_ns) &&
665 (period > sync_xfer_table[i - 1].period_ns))
666 return i;
667 }
668 return 7;
669 }
670
671 /*
672 * Prototype: unsigned char calc_sync_xfer(unsigned int period, unsigned int offset)
673 * Purpose : calculate value for 33c93s SYNC register
674 * Params : period - time (ns) for REQ
675 * offset - offset in bytes between REQ/ACK
676 * Returns : value for SYNC register
677 * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting
678 */
679 static
680 unsigned char calc_sync_xfer(unsigned int period, unsigned int offset)
681 {
682 return sync_xfer_table[round_period(period)].reg_value |
683 ((offset < SDTR_SIZE) ? offset : SDTR_SIZE);
684 }
685
686 /* ====================================================================================
687 * Command functions
688 */
689 /*
690 * Function: acornscsi_kick(AS_Host *host)
691 * Purpose : kick next command to interface
692 * Params : host - host to send command to
693 * Returns : INTR_IDLE if idle, otherwise INTR_PROCESSING
694 * Notes : interrupts are always disabled!
695 */
696 static
697 intr_ret_t acornscsi_kick(AS_Host *host)
698 {
699 int from_queue = 0;
700 struct scsi_cmnd *SCpnt;
701
702 /* first check to see if a command is waiting to be executed */
703 SCpnt = host->origSCpnt;
704 host->origSCpnt = NULL;
705
706 /* retrieve next command */
707 if (!SCpnt) {
708 SCpnt = queue_remove_exclude(&host->queues.issue, host->busyluns);
709 if (!SCpnt)
710 return INTR_IDLE;
711
712 from_queue = 1;
713 }
714
715 if (host->scsi.disconnectable && host->SCpnt) {
716 queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt);
717 host->scsi.disconnectable = 0;
718 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
719 DBG(host->SCpnt, printk("scsi%d.%c: moved command to disconnected queue\n",
720 host->host->host_no, acornscsi_target(host)));
721 #endif
722 host->SCpnt = NULL;
723 }
724
725 /*
726 * If we have an interrupt pending, then we may have been reselected.
727 * In this case, we don't want to write to the registers
728 */
729 if (!(sbic_arm_read(host, SBIC_ASR) & (ASR_INT|ASR_BSY|ASR_CIP))) {
730 sbic_arm_write(host, SBIC_DESTID, SCpnt->device->id);
731 sbic_arm_write(host, SBIC_CMND, CMND_SELWITHATN);
732 }
733
734 /*
735 * claim host busy - all of these must happen atomically wrt
736 * our interrupt routine. Failure means command loss.
737 */
738 host->scsi.phase = PHASE_CONNECTING;
739 host->SCpnt = SCpnt;
740 host->scsi.SCp = SCpnt->SCp;
741 host->dma.xfer_setup = 0;
742 host->dma.xfer_required = 0;
743 host->dma.xfer_done = 0;
744
745 #if (DEBUG & (DEBUG_ABORT|DEBUG_CONNECT))
746 DBG(SCpnt,printk("scsi%d.%c: starting cmd %02X\n",
747 host->host->host_no, '0' + SCpnt->device->id,
748 SCpnt->cmnd[0]));
749 #endif
750
751 if (from_queue) {
752 #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
753 /*
754 * tagged queueing - allocate a new tag to this command
755 */
756 if (SCpnt->device->simple_tags) {
757 SCpnt->device->current_tag += 1;
758 if (SCpnt->device->current_tag == 0)
759 SCpnt->device->current_tag = 1;
760 SCpnt->tag = SCpnt->device->current_tag;
761 } else
762 #endif
763 set_bit(SCpnt->device->id * 8 +
764 (u8)(SCpnt->device->lun & 0x07), host->busyluns);
765
766 host->stats.removes += 1;
767
768 switch (acornscsi_cmdtype(SCpnt->cmnd[0])) {
769 case CMD_WRITE:
770 host->stats.writes += 1;
771 break;
772 case CMD_READ:
773 host->stats.reads += 1;
774 break;
775 case CMD_MISC:
776 host->stats.miscs += 1;
777 break;
778 }
779 }
780
781 return INTR_PROCESSING;
782 }
783
784 /*
785 * Function: void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp, unsigned int result)
786 * Purpose : complete processing for command
787 * Params : host - interface that completed
788 * result - driver byte of result
789 */
790 static void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp,
791 unsigned int result)
792 {
793 struct scsi_cmnd *SCpnt = *SCpntp;
794
795 /* clean up */
796 sbic_arm_write(host, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP);
797
798 host->stats.fins += 1;
799
800 if (SCpnt) {
801 *SCpntp = NULL;
802
803 acornscsi_dma_cleanup(host);
804
805 SCpnt->result = result << 16 | host->scsi.SCp.Message << 8 | host->scsi.SCp.Status;
806
807 /*
808 * In theory, this should not happen. In practice, it seems to.
809 * Only trigger an error if the device attempts to report all happy
810 * but with untransferred buffers... If we don't do something, then
811 * data loss will occur. Should we check SCpnt->underflow here?
812 * It doesn't appear to be set to something meaningful by the higher
813 * levels all the time.
814 */
815 if (result == DID_OK) {
816 int xfer_warn = 0;
817
818 if (SCpnt->underflow == 0) {
819 if (host->scsi.SCp.ptr &&
820 acornscsi_cmdtype(SCpnt->cmnd[0]) != CMD_MISC)
821 xfer_warn = 1;
822 } else {
823 if (host->scsi.SCp.scsi_xferred < SCpnt->underflow ||
824 host->scsi.SCp.scsi_xferred != host->dma.transferred)
825 xfer_warn = 1;
826 }
827
828 /* ANSI standard says: (SCSI-2 Rev 10c Sect 5.6.6)
829 * Targets which break data transfers into multiple
830 * connections shall end each successful connection
831 * (except possibly the last) with a SAVE DATA
832 * POINTER - DISCONNECT message sequence.
833 *
834 * This makes it difficult to ensure that a transfer has
835 * completed. If we reach the end of a transfer during
836 * the command, then we can only have finished the transfer.
837 * therefore, if we seem to have some data remaining, this
838 * is not a problem.
839 */
840 if (host->dma.xfer_done)
841 xfer_warn = 0;
842
843 if (xfer_warn) {
844 switch (status_byte(SCpnt->result)) {
845 case CHECK_CONDITION:
846 case COMMAND_TERMINATED:
847 case BUSY:
848 case QUEUE_FULL:
849 case RESERVATION_CONFLICT:
850 break;
851
852 default:
853 scmd_printk(KERN_ERR, SCpnt,
854 "incomplete data transfer detected: "
855 "result=%08X", SCpnt->result);
856 scsi_print_command(SCpnt);
857 acornscsi_dumpdma(host, "done");
858 acornscsi_dumplog(host, SCpnt->device->id);
859 set_host_byte(SCpnt, DID_ERROR);
860 }
861 }
862 }
863
864 if (!SCpnt->scsi_done)
865 panic("scsi%d.H: null scsi_done function in acornscsi_done", host->host->host_no);
866
867 clear_bit(SCpnt->device->id * 8 +
868 (u8)(SCpnt->device->lun & 0x7), host->busyluns);
869
870 SCpnt->scsi_done(SCpnt);
871 } else
872 printk("scsi%d: null command in acornscsi_done", host->host->host_no);
873
874 host->scsi.phase = PHASE_IDLE;
875 }
876
877 /* ====================================================================================
878 * DMA routines
879 */
880 /*
881 * Purpose : update SCSI Data Pointer
882 * Notes : this will only be one SG entry or less
883 */
884 static
885 void acornscsi_data_updateptr(AS_Host *host, struct scsi_pointer *SCp, unsigned int length)
886 {
887 SCp->ptr += length;
888 SCp->this_residual -= length;
889
890 if (SCp->this_residual == 0 && next_SCp(SCp) == 0)
891 host->dma.xfer_done = 1;
892 }
893
894 /*
895 * Prototype: void acornscsi_data_read(AS_Host *host, char *ptr,
896 * unsigned int start_addr, unsigned int length)
897 * Purpose : read data from DMA RAM
898 * Params : host - host to transfer from
899 * ptr - DRAM address
900 * start_addr - host mem address
901 * length - number of bytes to transfer
902 * Notes : this will only be one SG entry or less
903 */
904 static
905 void acornscsi_data_read(AS_Host *host, char *ptr,
906 unsigned int start_addr, unsigned int length)
907 {
908 extern void __acornscsi_in(void __iomem *, char *buf, int len);
909 unsigned int page, offset, len = length;
910
911 page = (start_addr >> 12);
912 offset = start_addr & ((1 << 12) - 1);
913
914 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG);
915
916 while (len > 0) {
917 unsigned int this_len;
918
919 if (len + offset > (1 << 12))
920 this_len = (1 << 12) - offset;
921 else
922 this_len = len;
923
924 __acornscsi_in(host->base + (offset << 1), ptr, this_len);
925
926 offset += this_len;
927 ptr += this_len;
928 len -= this_len;
929
930 if (offset == (1 << 12)) {
931 offset = 0;
932 page ++;
933 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG);
934 }
935 }
936 writeb(host->card.page_reg, host->fast + PAGE_REG);
937 }
938
939 /*
940 * Prototype: void acornscsi_data_write(AS_Host *host, char *ptr,
941 * unsigned int start_addr, unsigned int length)
942 * Purpose : write data to DMA RAM
943 * Params : host - host to transfer from
944 * ptr - DRAM address
945 * start_addr - host mem address
946 * length - number of bytes to transfer
947 * Notes : this will only be one SG entry or less
948 */
949 static
950 void acornscsi_data_write(AS_Host *host, char *ptr,
951 unsigned int start_addr, unsigned int length)
952 {
953 extern void __acornscsi_out(void __iomem *, char *buf, int len);
954 unsigned int page, offset, len = length;
955
956 page = (start_addr >> 12);
957 offset = start_addr & ((1 << 12) - 1);
958
959 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG);
960
961 while (len > 0) {
962 unsigned int this_len;
963
964 if (len + offset > (1 << 12))
965 this_len = (1 << 12) - offset;
966 else
967 this_len = len;
968
969 __acornscsi_out(host->base + (offset << 1), ptr, this_len);
970
971 offset += this_len;
972 ptr += this_len;
973 len -= this_len;
974
975 if (offset == (1 << 12)) {
976 offset = 0;
977 page ++;
978 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG);
979 }
980 }
981 writeb(host->card.page_reg, host->fast + PAGE_REG);
982 }
983
984 /* =========================================================================================
985 * On-board DMA routines
986 */
987 #ifdef USE_DMAC
988 /*
989 * Prototype: void acornscsi_dmastop(AS_Host *host)
990 * Purpose : stop all DMA
991 * Params : host - host on which to stop DMA
992 * Notes : This is called when leaving DATA IN/OUT phase,
993 * or when interface is RESET
994 */
995 static inline
996 void acornscsi_dma_stop(AS_Host *host)
997 {
998 dmac_write(host, DMAC_MASKREG, MASK_ON);
999 dmac_clearintr(host);
1000
1001 #if (DEBUG & DEBUG_DMA)
1002 DBG(host->SCpnt, acornscsi_dumpdma(host, "stop"));
1003 #endif
1004 }
1005
1006 /*
1007 * Function: void acornscsi_dma_setup(AS_Host *host, dmadir_t direction)
1008 * Purpose : setup DMA controller for data transfer
1009 * Params : host - host to setup
1010 * direction - data transfer direction
1011 * Notes : This is called when entering DATA I/O phase, not
1012 * while we're in a DATA I/O phase
1013 */
1014 static
1015 void acornscsi_dma_setup(AS_Host *host, dmadir_t direction)
1016 {
1017 unsigned int address, length, mode;
1018
1019 host->dma.direction = direction;
1020
1021 dmac_write(host, DMAC_MASKREG, MASK_ON);
1022
1023 if (direction == DMA_OUT) {
1024 #if (DEBUG & DEBUG_NO_WRITE)
1025 if (NO_WRITE & (1 << host->SCpnt->device->id)) {
1026 printk(KERN_CRIT "scsi%d.%c: I can't handle DMA_OUT!\n",
1027 host->host->host_no, acornscsi_target(host));
1028 return;
1029 }
1030 #endif
1031 mode = DMAC_WRITE;
1032 } else
1033 mode = DMAC_READ;
1034
1035 /*
1036 * Allocate some buffer space, limited to half the buffer size
1037 */
1038 length = min_t(unsigned int, host->scsi.SCp.this_residual, DMAC_BUFFER_SIZE / 2);
1039 if (length) {
1040 host->dma.start_addr = address = host->dma.free_addr;
1041 host->dma.free_addr = (host->dma.free_addr + length) &
1042 (DMAC_BUFFER_SIZE - 1);
1043
1044 /*
1045 * Transfer data to DMA memory
1046 */
1047 if (direction == DMA_OUT)
1048 acornscsi_data_write(host, host->scsi.SCp.ptr, host->dma.start_addr,
1049 length);
1050
1051 length -= 1;
1052 dmac_write(host, DMAC_TXCNTLO, length);
1053 dmac_write(host, DMAC_TXCNTHI, length >> 8);
1054 dmac_write(host, DMAC_TXADRLO, address);
1055 dmac_write(host, DMAC_TXADRMD, address >> 8);
1056 dmac_write(host, DMAC_TXADRHI, 0);
1057 dmac_write(host, DMAC_MODECON, mode);
1058 dmac_write(host, DMAC_MASKREG, MASK_OFF);
1059
1060 #if (DEBUG & DEBUG_DMA)
1061 DBG(host->SCpnt, acornscsi_dumpdma(host, "strt"));
1062 #endif
1063 host->dma.xfer_setup = 1;
1064 }
1065 }
1066
1067 /*
1068 * Function: void acornscsi_dma_cleanup(AS_Host *host)
1069 * Purpose : ensure that all DMA transfers are up-to-date & host->scsi.SCp is correct
1070 * Params : host - host to finish
1071 * Notes : This is called when a command is:
1072 * terminating, RESTORE_POINTERS, SAVE_POINTERS, DISCONECT
1073 * : This must not return until all transfers are completed.
1074 */
1075 static
1076 void acornscsi_dma_cleanup(AS_Host *host)
1077 {
1078 dmac_write(host, DMAC_MASKREG, MASK_ON);
1079 dmac_clearintr(host);
1080
1081 /*
1082 * Check for a pending transfer
1083 */
1084 if (host->dma.xfer_required) {
1085 host->dma.xfer_required = 0;
1086 if (host->dma.direction == DMA_IN)
1087 acornscsi_data_read(host, host->dma.xfer_ptr,
1088 host->dma.xfer_start, host->dma.xfer_length);
1089 }
1090
1091 /*
1092 * Has a transfer been setup?
1093 */
1094 if (host->dma.xfer_setup) {
1095 unsigned int transferred;
1096
1097 host->dma.xfer_setup = 0;
1098
1099 #if (DEBUG & DEBUG_DMA)
1100 DBG(host->SCpnt, acornscsi_dumpdma(host, "cupi"));
1101 #endif
1102
1103 /*
1104 * Calculate number of bytes transferred from DMA.
1105 */
1106 transferred = dmac_address(host) - host->dma.start_addr;
1107 host->dma.transferred += transferred;
1108
1109 if (host->dma.direction == DMA_IN)
1110 acornscsi_data_read(host, host->scsi.SCp.ptr,
1111 host->dma.start_addr, transferred);
1112
1113 /*
1114 * Update SCSI pointers
1115 */
1116 acornscsi_data_updateptr(host, &host->scsi.SCp, transferred);
1117 #if (DEBUG & DEBUG_DMA)
1118 DBG(host->SCpnt, acornscsi_dumpdma(host, "cupo"));
1119 #endif
1120 }
1121 }
1122
1123 /*
1124 * Function: void acornscsi_dmacintr(AS_Host *host)
1125 * Purpose : handle interrupts from DMAC device
1126 * Params : host - host to process
1127 * Notes : If reading, we schedule the read to main memory &
1128 * allow the transfer to continue.
1129 * : If writing, we fill the onboard DMA memory from main
1130 * memory.
1131 * : Called whenever DMAC finished it's current transfer.
1132 */
1133 static
1134 void acornscsi_dma_intr(AS_Host *host)
1135 {
1136 unsigned int address, length, transferred;
1137
1138 #if (DEBUG & DEBUG_DMA)
1139 DBG(host->SCpnt, acornscsi_dumpdma(host, "inti"));
1140 #endif
1141
1142 dmac_write(host, DMAC_MASKREG, MASK_ON);
1143 dmac_clearintr(host);
1144
1145 /*
1146 * Calculate amount transferred via DMA
1147 */
1148 transferred = dmac_address(host) - host->dma.start_addr;
1149 host->dma.transferred += transferred;
1150
1151 /*
1152 * Schedule DMA transfer off board
1153 */
1154 if (host->dma.direction == DMA_IN) {
1155 host->dma.xfer_start = host->dma.start_addr;
1156 host->dma.xfer_length = transferred;
1157 host->dma.xfer_ptr = host->scsi.SCp.ptr;
1158 host->dma.xfer_required = 1;
1159 }
1160
1161 acornscsi_data_updateptr(host, &host->scsi.SCp, transferred);
1162
1163 /*
1164 * Allocate some buffer space, limited to half the on-board RAM size
1165 */
1166 length = min_t(unsigned int, host->scsi.SCp.this_residual, DMAC_BUFFER_SIZE / 2);
1167 if (length) {
1168 host->dma.start_addr = address = host->dma.free_addr;
1169 host->dma.free_addr = (host->dma.free_addr + length) &
1170 (DMAC_BUFFER_SIZE - 1);
1171
1172 /*
1173 * Transfer data to DMA memory
1174 */
1175 if (host->dma.direction == DMA_OUT)
1176 acornscsi_data_write(host, host->scsi.SCp.ptr, host->dma.start_addr,
1177 length);
1178
1179 length -= 1;
1180 dmac_write(host, DMAC_TXCNTLO, length);
1181 dmac_write(host, DMAC_TXCNTHI, length >> 8);
1182 dmac_write(host, DMAC_TXADRLO, address);
1183 dmac_write(host, DMAC_TXADRMD, address >> 8);
1184 dmac_write(host, DMAC_TXADRHI, 0);
1185 dmac_write(host, DMAC_MASKREG, MASK_OFF);
1186
1187 #if (DEBUG & DEBUG_DMA)
1188 DBG(host->SCpnt, acornscsi_dumpdma(host, "into"));
1189 #endif
1190 } else {
1191 host->dma.xfer_setup = 0;
1192 #if 0
1193 /*
1194 * If the interface still wants more, then this is an error.
1195 * We give it another byte, but we also attempt to raise an
1196 * attention condition. We continue giving one byte until
1197 * the device recognises the attention.
1198 */
1199 if (dmac_read(host, DMAC_STATUS) & STATUS_RQ0) {
1200 acornscsi_abortcmd(host, host->SCpnt->tag);
1201
1202 dmac_write(host, DMAC_TXCNTLO, 0);
1203 dmac_write(host, DMAC_TXCNTHI, 0);
1204 dmac_write(host, DMAC_TXADRLO, 0);
1205 dmac_write(host, DMAC_TXADRMD, 0);
1206 dmac_write(host, DMAC_TXADRHI, 0);
1207 dmac_write(host, DMAC_MASKREG, MASK_OFF);
1208 }
1209 #endif
1210 }
1211 }
1212
1213 /*
1214 * Function: void acornscsi_dma_xfer(AS_Host *host)
1215 * Purpose : transfer data between AcornSCSI and memory
1216 * Params : host - host to process
1217 */
1218 static
1219 void acornscsi_dma_xfer(AS_Host *host)
1220 {
1221 host->dma.xfer_required = 0;
1222
1223 if (host->dma.direction == DMA_IN)
1224 acornscsi_data_read(host, host->dma.xfer_ptr,
1225 host->dma.xfer_start, host->dma.xfer_length);
1226 }
1227
1228 /*
1229 * Function: void acornscsi_dma_adjust(AS_Host *host)
1230 * Purpose : adjust DMA pointers & count for bytes transferred to
1231 * SBIC but not SCSI bus.
1232 * Params : host - host to adjust DMA count for
1233 */
1234 static
1235 void acornscsi_dma_adjust(AS_Host *host)
1236 {
1237 if (host->dma.xfer_setup) {
1238 signed long transferred;
1239 #if (DEBUG & (DEBUG_DMA|DEBUG_WRITE))
1240 DBG(host->SCpnt, acornscsi_dumpdma(host, "adji"));
1241 #endif
1242 /*
1243 * Calculate correct DMA address - DMA is ahead of SCSI bus while
1244 * writing.
1245 * host->scsi.SCp.scsi_xferred is the number of bytes
1246 * actually transferred to/from the SCSI bus.
1247 * host->dma.transferred is the number of bytes transferred
1248 * over DMA since host->dma.start_addr was last set.
1249 *
1250 * real_dma_addr = host->dma.start_addr + host->scsi.SCp.scsi_xferred
1251 * - host->dma.transferred
1252 */
1253 transferred = host->scsi.SCp.scsi_xferred - host->dma.transferred;
1254 if (transferred < 0)
1255 printk("scsi%d.%c: Ack! DMA write correction %ld < 0!\n",
1256 host->host->host_no, acornscsi_target(host), transferred);
1257 else if (transferred == 0)
1258 host->dma.xfer_setup = 0;
1259 else {
1260 transferred += host->dma.start_addr;
1261 dmac_write(host, DMAC_TXADRLO, transferred);
1262 dmac_write(host, DMAC_TXADRMD, transferred >> 8);
1263 dmac_write(host, DMAC_TXADRHI, transferred >> 16);
1264 #if (DEBUG & (DEBUG_DMA|DEBUG_WRITE))
1265 DBG(host->SCpnt, acornscsi_dumpdma(host, "adjo"));
1266 #endif
1267 }
1268 }
1269 }
1270 #endif
1271
1272 /* =========================================================================================
1273 * Data I/O
1274 */
1275 static int
1276 acornscsi_write_pio(AS_Host *host, char *bytes, int *ptr, int len, unsigned int max_timeout)
1277 {
1278 unsigned int asr, timeout = max_timeout;
1279 int my_ptr = *ptr;
1280
1281 while (my_ptr < len) {
1282 asr = sbic_arm_read(host, SBIC_ASR);
1283
1284 if (asr & ASR_DBR) {
1285 timeout = max_timeout;
1286
1287 sbic_arm_write(host, SBIC_DATA, bytes[my_ptr++]);
1288 } else if (asr & ASR_INT)
1289 break;
1290 else if (--timeout == 0)
1291 break;
1292 udelay(1);
1293 }
1294
1295 *ptr = my_ptr;
1296
1297 return (timeout == 0) ? -1 : 0;
1298 }
1299
1300 /*
1301 * Function: void acornscsi_sendcommand(AS_Host *host)
1302 * Purpose : send a command to a target
1303 * Params : host - host which is connected to target
1304 */
1305 static void
1306 acornscsi_sendcommand(AS_Host *host)
1307 {
1308 struct scsi_cmnd *SCpnt = host->SCpnt;
1309
1310 sbic_arm_write(host, SBIC_TRANSCNTH, 0);
1311 sbic_arm_writenext(host, 0);
1312 sbic_arm_writenext(host, SCpnt->cmd_len - host->scsi.SCp.sent_command);
1313
1314 acornscsi_sbic_issuecmd(host, CMND_XFERINFO);
1315
1316 if (acornscsi_write_pio(host, SCpnt->cmnd,
1317 (int *)&host->scsi.SCp.sent_command, SCpnt->cmd_len, 1000000))
1318 printk("scsi%d: timeout while sending command\n", host->host->host_no);
1319
1320 host->scsi.phase = PHASE_COMMAND;
1321 }
1322
1323 static
1324 void acornscsi_sendmessage(AS_Host *host)
1325 {
1326 unsigned int message_length = msgqueue_msglength(&host->scsi.msgs);
1327 unsigned int msgnr;
1328 struct message *msg;
1329
1330 #if (DEBUG & DEBUG_MESSAGES)
1331 printk("scsi%d.%c: sending message ",
1332 host->host->host_no, acornscsi_target(host));
1333 #endif
1334
1335 switch (message_length) {
1336 case 0:
1337 acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT);
1338
1339 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "sending message 1");
1340
1341 sbic_arm_write(host, SBIC_DATA, NOP);
1342
1343 host->scsi.last_message = NOP;
1344 #if (DEBUG & DEBUG_MESSAGES)
1345 printk("NOP");
1346 #endif
1347 break;
1348
1349 case 1:
1350 acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT);
1351 msg = msgqueue_getmsg(&host->scsi.msgs, 0);
1352
1353 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "sending message 2");
1354
1355 sbic_arm_write(host, SBIC_DATA, msg->msg[0]);
1356
1357 host->scsi.last_message = msg->msg[0];
1358 #if (DEBUG & DEBUG_MESSAGES)
1359 spi_print_msg(msg->msg);
1360 #endif
1361 break;
1362
1363 default:
1364 /*
1365 * ANSI standard says: (SCSI-2 Rev 10c Sect 5.6.14)
1366 * 'When a target sends this (MESSAGE_REJECT) message, it
1367 * shall change to MESSAGE IN phase and send this message
1368 * prior to requesting additional message bytes from the
1369 * initiator. This provides an interlock so that the
1370 * initiator can determine which message byte is rejected.
1371 */
1372 sbic_arm_write(host, SBIC_TRANSCNTH, 0);
1373 sbic_arm_writenext(host, 0);
1374 sbic_arm_writenext(host, message_length);
1375 acornscsi_sbic_issuecmd(host, CMND_XFERINFO);
1376
1377 msgnr = 0;
1378 while ((msg = msgqueue_getmsg(&host->scsi.msgs, msgnr++)) != NULL) {
1379 unsigned int i;
1380 #if (DEBUG & DEBUG_MESSAGES)
1381 spi_print_msg(msg);
1382 #endif
1383 i = 0;
1384 if (acornscsi_write_pio(host, msg->msg, &i, msg->length, 1000000))
1385 printk("scsi%d: timeout while sending message\n", host->host->host_no);
1386
1387 host->scsi.last_message = msg->msg[0];
1388 if (msg->msg[0] == EXTENDED_MESSAGE)
1389 host->scsi.last_message |= msg->msg[2] << 8;
1390
1391 if (i != msg->length)
1392 break;
1393 }
1394 break;
1395 }
1396 #if (DEBUG & DEBUG_MESSAGES)
1397 printk("\n");
1398 #endif
1399 }
1400
1401 /*
1402 * Function: void acornscsi_readstatusbyte(AS_Host *host)
1403 * Purpose : Read status byte from connected target
1404 * Params : host - host connected to target
1405 */
1406 static
1407 void acornscsi_readstatusbyte(AS_Host *host)
1408 {
1409 acornscsi_sbic_issuecmd(host, CMND_XFERINFO|CMND_SBT);
1410 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "reading status byte");
1411 host->scsi.SCp.Status = sbic_arm_read(host, SBIC_DATA);
1412 }
1413
1414 /*
1415 * Function: unsigned char acornscsi_readmessagebyte(AS_Host *host)
1416 * Purpose : Read one message byte from connected target
1417 * Params : host - host connected to target
1418 */
1419 static
1420 unsigned char acornscsi_readmessagebyte(AS_Host *host)
1421 {
1422 unsigned char message;
1423
1424 acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT);
1425
1426 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "for message byte");
1427
1428 message = sbic_arm_read(host, SBIC_DATA);
1429
1430 /* wait for MSGIN-XFER-PAUSED */
1431 acornscsi_sbic_wait(host, ASR_INT, ASR_INT, 1000, "for interrupt after message byte");
1432
1433 sbic_arm_read(host, SBIC_SSR);
1434
1435 return message;
1436 }
1437
1438 /*
1439 * Function: void acornscsi_message(AS_Host *host)
1440 * Purpose : Read complete message from connected target & action message
1441 * Params : host - host connected to target
1442 */
1443 static
1444 void acornscsi_message(AS_Host *host)
1445 {
1446 unsigned char message[16];
1447 unsigned int msgidx = 0, msglen = 1;
1448
1449 do {
1450 message[msgidx] = acornscsi_readmessagebyte(host);
1451
1452 switch (msgidx) {
1453 case 0:
1454 if (message[0] == EXTENDED_MESSAGE ||
1455 (message[0] >= 0x20 && message[0] <= 0x2f))
1456 msglen = 2;
1457 break;
1458
1459 case 1:
1460 if (message[0] == EXTENDED_MESSAGE)
1461 msglen += message[msgidx];
1462 break;
1463 }
1464 msgidx += 1;
1465 if (msgidx < msglen) {
1466 acornscsi_sbic_issuecmd(host, CMND_NEGATEACK);
1467
1468 /* wait for next msg-in */
1469 acornscsi_sbic_wait(host, ASR_INT, ASR_INT, 1000, "for interrupt after negate ack");
1470 sbic_arm_read(host, SBIC_SSR);
1471 }
1472 } while (msgidx < msglen);
1473
1474 #if (DEBUG & DEBUG_MESSAGES)
1475 printk("scsi%d.%c: message in: ",
1476 host->host->host_no, acornscsi_target(host));
1477 spi_print_msg(message);
1478 printk("\n");
1479 #endif
1480
1481 if (host->scsi.phase == PHASE_RECONNECTED) {
1482 /*
1483 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.17)
1484 * 'Whenever a target reconnects to an initiator to continue
1485 * a tagged I/O process, the SIMPLE QUEUE TAG message shall
1486 * be sent immediately following the IDENTIFY message...'
1487 */
1488 if (message[0] == SIMPLE_QUEUE_TAG)
1489 host->scsi.reconnected.tag = message[1];
1490 if (acornscsi_reconnect_finish(host))
1491 host->scsi.phase = PHASE_MSGIN;
1492 }
1493
1494 switch (message[0]) {
1495 case ABORT:
1496 case ABORT_TAG:
1497 case COMMAND_COMPLETE:
1498 if (host->scsi.phase != PHASE_STATUSIN) {
1499 printk(KERN_ERR "scsi%d.%c: command complete following non-status in phase?\n",
1500 host->host->host_no, acornscsi_target(host));
1501 acornscsi_dumplog(host, host->SCpnt->device->id);
1502 }
1503 host->scsi.phase = PHASE_DONE;
1504 host->scsi.SCp.Message = message[0];
1505 break;
1506
1507 case SAVE_POINTERS:
1508 /*
1509 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.20)
1510 * 'The SAVE DATA POINTER message is sent from a target to
1511 * direct the initiator to copy the active data pointer to
1512 * the saved data pointer for the current I/O process.
1513 */
1514 acornscsi_dma_cleanup(host);
1515 host->SCpnt->SCp = host->scsi.SCp;
1516 host->SCpnt->SCp.sent_command = 0;
1517 host->scsi.phase = PHASE_MSGIN;
1518 break;
1519
1520 case RESTORE_POINTERS:
1521 /*
1522 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.19)
1523 * 'The RESTORE POINTERS message is sent from a target to
1524 * direct the initiator to copy the most recently saved
1525 * command, data, and status pointers for the I/O process
1526 * to the corresponding active pointers. The command and
1527 * status pointers shall be restored to the beginning of
1528 * the present command and status areas.'
1529 */
1530 acornscsi_dma_cleanup(host);
1531 host->scsi.SCp = host->SCpnt->SCp;
1532 host->scsi.phase = PHASE_MSGIN;
1533 break;
1534
1535 case DISCONNECT:
1536 /*
1537 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 6.4.2)
1538 * 'On those occasions when an error or exception condition occurs
1539 * and the target elects to repeat the information transfer, the
1540 * target may repeat the transfer either issuing a RESTORE POINTERS
1541 * message or by disconnecting without issuing a SAVE POINTERS
1542 * message. When reconnection is completed, the most recent
1543 * saved pointer values are restored.'
1544 */
1545 acornscsi_dma_cleanup(host);
1546 host->scsi.phase = PHASE_DISCONNECT;
1547 break;
1548
1549 case MESSAGE_REJECT:
1550 #if 0 /* this isn't needed any more */
1551 /*
1552 * If we were negociating sync transfer, we don't yet know if
1553 * this REJECT is for the sync transfer or for the tagged queue/wide
1554 * transfer. Re-initiate sync transfer negotiation now, and if
1555 * we got a REJECT in response to SDTR, then it'll be set to DONE.
1556 */
1557 if (host->device[host->SCpnt->device->id].sync_state == SYNC_SENT_REQUEST)
1558 host->device[host->SCpnt->device->id].sync_state = SYNC_NEGOCIATE;
1559 #endif
1560
1561 /*
1562 * If we have any messages waiting to go out, then assert ATN now
1563 */
1564 if (msgqueue_msglength(&host->scsi.msgs))
1565 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN);
1566
1567 switch (host->scsi.last_message) {
1568 #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
1569 case HEAD_OF_QUEUE_TAG:
1570 case ORDERED_QUEUE_TAG:
1571 case SIMPLE_QUEUE_TAG:
1572 /*
1573 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.17)
1574 * If a target does not implement tagged queuing and a queue tag
1575 * message is received, it shall respond with a MESSAGE REJECT
1576 * message and accept the I/O process as if it were untagged.
1577 */
1578 printk(KERN_NOTICE "scsi%d.%c: disabling tagged queueing\n",
1579 host->host->host_no, acornscsi_target(host));
1580 host->SCpnt->device->simple_tags = 0;
1581 set_bit(host->SCpnt->device->id * 8 +
1582 (u8)(host->SCpnt->device->lun & 0x7), host->busyluns);
1583 break;
1584 #endif
1585 case EXTENDED_MESSAGE | (EXTENDED_SDTR << 8):
1586 /*
1587 * Target can't handle synchronous transfers
1588 */
1589 printk(KERN_NOTICE "scsi%d.%c: Using asynchronous transfer\n",
1590 host->host->host_no, acornscsi_target(host));
1591 host->device[host->SCpnt->device->id].sync_xfer = SYNCHTRANSFER_2DBA;
1592 host->device[host->SCpnt->device->id].sync_state = SYNC_ASYNCHRONOUS;
1593 sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer);
1594 break;
1595
1596 default:
1597 break;
1598 }
1599 break;
1600
1601 case QUEUE_FULL:
1602 /* TODO: target queue is full */
1603 break;
1604
1605 case SIMPLE_QUEUE_TAG:
1606 /* tag queue reconnect... message[1] = queue tag. Print something to indicate something happened! */
1607 printk("scsi%d.%c: reconnect queue tag %02X\n",
1608 host->host->host_no, acornscsi_target(host),
1609 message[1]);
1610 break;
1611
1612 case EXTENDED_MESSAGE:
1613 switch (message[2]) {
1614 #ifdef CONFIG_SCSI_ACORNSCSI_SYNC
1615 case EXTENDED_SDTR:
1616 if (host->device[host->SCpnt->device->id].sync_state == SYNC_SENT_REQUEST) {
1617 /*
1618 * We requested synchronous transfers. This isn't quite right...
1619 * We can only say if this succeeded if we proceed on to execute the
1620 * command from this message. If we get a MESSAGE PARITY ERROR,
1621 * and the target retries fail, then we fallback to asynchronous mode
1622 */
1623 host->device[host->SCpnt->device->id].sync_state = SYNC_COMPLETED;
1624 printk(KERN_NOTICE "scsi%d.%c: Using synchronous transfer, offset %d, %d ns\n",
1625 host->host->host_no, acornscsi_target(host),
1626 message[4], message[3] * 4);
1627 host->device[host->SCpnt->device->id].sync_xfer =
1628 calc_sync_xfer(message[3] * 4, message[4]);
1629 } else {
1630 unsigned char period, length;
1631 /*
1632 * Target requested synchronous transfers. The agreement is only
1633 * to be in operation AFTER the target leaves message out phase.
1634 */
1635 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN);
1636 period = max_t(unsigned int, message[3], sdtr_period / 4);
1637 length = min_t(unsigned int, message[4], sdtr_size);
1638 msgqueue_addmsg(&host->scsi.msgs, 5, EXTENDED_MESSAGE, 3,
1639 EXTENDED_SDTR, period, length);
1640 host->device[host->SCpnt->device->id].sync_xfer =
1641 calc_sync_xfer(period * 4, length);
1642 }
1643 sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer);
1644 break;
1645 #else
1646 /* We do not accept synchronous transfers. Respond with a
1647 * MESSAGE_REJECT.
1648 */
1649 #endif
1650
1651 case EXTENDED_WDTR:
1652 /* The WD33C93A is only 8-bit. We respond with a MESSAGE_REJECT
1653 * to a wide data transfer request.
1654 */
1655 default:
1656 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN);
1657 msgqueue_flush(&host->scsi.msgs);
1658 msgqueue_addmsg(&host->scsi.msgs, 1, MESSAGE_REJECT);
1659 break;
1660 }
1661 break;
1662
1663 default: /* reject message */
1664 printk(KERN_ERR "scsi%d.%c: unrecognised message %02X, rejecting\n",
1665 host->host->host_no, acornscsi_target(host),
1666 message[0]);
1667 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN);
1668 msgqueue_flush(&host->scsi.msgs);
1669 msgqueue_addmsg(&host->scsi.msgs, 1, MESSAGE_REJECT);
1670 host->scsi.phase = PHASE_MSGIN;
1671 break;
1672 }
1673 acornscsi_sbic_issuecmd(host, CMND_NEGATEACK);
1674 }
1675
1676 /*
1677 * Function: int acornscsi_buildmessages(AS_Host *host)
1678 * Purpose : build the connection messages for a host
1679 * Params : host - host to add messages to
1680 */
1681 static
1682 void acornscsi_buildmessages(AS_Host *host)
1683 {
1684 #if 0
1685 /* does the device need resetting? */
1686 if (cmd_reset) {
1687 msgqueue_addmsg(&host->scsi.msgs, 1, BUS_DEVICE_RESET);
1688 return;
1689 }
1690 #endif
1691
1692 msgqueue_addmsg(&host->scsi.msgs, 1,
1693 IDENTIFY(host->device[host->SCpnt->device->id].disconnect_ok,
1694 host->SCpnt->device->lun));
1695
1696 #if 0
1697 /* does the device need the current command aborted */
1698 if (cmd_aborted) {
1699 acornscsi_abortcmd(host->SCpnt->tag);
1700 return;
1701 }
1702 #endif
1703
1704 #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
1705 if (host->SCpnt->tag) {
1706 unsigned int tag_type;
1707
1708 if (host->SCpnt->cmnd[0] == REQUEST_SENSE ||
1709 host->SCpnt->cmnd[0] == TEST_UNIT_READY ||
1710 host->SCpnt->cmnd[0] == INQUIRY)
1711 tag_type = HEAD_OF_QUEUE_TAG;
1712 else
1713 tag_type = SIMPLE_QUEUE_TAG;
1714 msgqueue_addmsg(&host->scsi.msgs, 2, tag_type, host->SCpnt->tag);
1715 }
1716 #endif
1717
1718 #ifdef CONFIG_SCSI_ACORNSCSI_SYNC
1719 if (host->device[host->SCpnt->device->id].sync_state == SYNC_NEGOCIATE) {
1720 host->device[host->SCpnt->device->id].sync_state = SYNC_SENT_REQUEST;
1721 msgqueue_addmsg(&host->scsi.msgs, 5,
1722 EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
1723 sdtr_period / 4, sdtr_size);
1724 }
1725 #endif
1726 }
1727
1728 /*
1729 * Function: int acornscsi_starttransfer(AS_Host *host)
1730 * Purpose : transfer data to/from connected target
1731 * Params : host - host to which target is connected
1732 * Returns : 0 if failure
1733 */
1734 static
1735 int acornscsi_starttransfer(AS_Host *host)
1736 {
1737 int residual;
1738
1739 if (!host->scsi.SCp.ptr /*&& host->scsi.SCp.this_residual*/) {
1740 printk(KERN_ERR "scsi%d.%c: null buffer passed to acornscsi_starttransfer\n",
1741 host->host->host_no, acornscsi_target(host));
1742 return 0;
1743 }
1744
1745 residual = scsi_bufflen(host->SCpnt) - host->scsi.SCp.scsi_xferred;
1746
1747 sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer);
1748 sbic_arm_writenext(host, residual >> 16);
1749 sbic_arm_writenext(host, residual >> 8);
1750 sbic_arm_writenext(host, residual);
1751 acornscsi_sbic_issuecmd(host, CMND_XFERINFO);
1752 return 1;
1753 }
1754
1755 /* =========================================================================================
1756 * Connection & Disconnection
1757 */
1758 /*
1759 * Function : acornscsi_reconnect(AS_Host *host)
1760 * Purpose : reconnect a previously disconnected command
1761 * Params : host - host specific data
1762 * Remarks : SCSI spec says:
1763 * 'The set of active pointers is restored from the set
1764 * of saved pointers upon reconnection of the I/O process'
1765 */
1766 static
1767 int acornscsi_reconnect(AS_Host *host)
1768 {
1769 unsigned int target, lun, ok = 0;
1770
1771 target = sbic_arm_read(host, SBIC_SOURCEID);
1772
1773 if (!(target & 8))
1774 printk(KERN_ERR "scsi%d: invalid source id after reselection "
1775 "- device fault?\n",
1776 host->host->host_no);
1777
1778 target &= 7;
1779
1780 if (host->SCpnt && !host->scsi.disconnectable) {
1781 printk(KERN_ERR "scsi%d.%d: reconnected while command in "
1782 "progress to target %d?\n",
1783 host->host->host_no, target, host->SCpnt->device->id);
1784 host->SCpnt = NULL;
1785 }
1786
1787 lun = sbic_arm_read(host, SBIC_DATA) & 7;
1788
1789 host->scsi.reconnected.target = target;
1790 host->scsi.reconnected.lun = lun;
1791 host->scsi.reconnected.tag = 0;
1792
1793 if (host->scsi.disconnectable && host->SCpnt &&
1794 host->SCpnt->device->id == target && host->SCpnt->device->lun == lun)
1795 ok = 1;
1796
1797 if (!ok && queue_probetgtlun(&host->queues.disconnected, target, lun))
1798 ok = 1;
1799
1800 ADD_STATUS(target, 0x81, host->scsi.phase, 0);
1801
1802 if (ok) {
1803 host->scsi.phase = PHASE_RECONNECTED;
1804 } else {
1805 /* this doesn't seem to work */
1806 printk(KERN_ERR "scsi%d.%c: reselected with no command "
1807 "to reconnect with\n",
1808 host->host->host_no, '0' + target);
1809 acornscsi_dumplog(host, target);
1810 acornscsi_abortcmd(host, 0);
1811 if (host->SCpnt) {
1812 queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt);
1813 host->SCpnt = NULL;
1814 }
1815 }
1816 acornscsi_sbic_issuecmd(host, CMND_NEGATEACK);
1817 return !ok;
1818 }
1819
1820 /*
1821 * Function: int acornscsi_reconect_finish(AS_Host *host)
1822 * Purpose : finish reconnecting a command
1823 * Params : host - host to complete
1824 * Returns : 0 if failed
1825 */
1826 static
1827 int acornscsi_reconnect_finish(AS_Host *host)
1828 {
1829 if (host->scsi.disconnectable && host->SCpnt) {
1830 host->scsi.disconnectable = 0;
1831 if (host->SCpnt->device->id == host->scsi.reconnected.target &&
1832 host->SCpnt->device->lun == host->scsi.reconnected.lun &&
1833 host->SCpnt->tag == host->scsi.reconnected.tag) {
1834 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
1835 DBG(host->SCpnt, printk("scsi%d.%c: reconnected",
1836 host->host->host_no, acornscsi_target(host)));
1837 #endif
1838 } else {
1839 queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt);
1840 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
1841 DBG(host->SCpnt, printk("scsi%d.%c: had to move command "
1842 "to disconnected queue\n",
1843 host->host->host_no, acornscsi_target(host)));
1844 #endif
1845 host->SCpnt = NULL;
1846 }
1847 }
1848 if (!host->SCpnt) {
1849 host->SCpnt = queue_remove_tgtluntag(&host->queues.disconnected,
1850 host->scsi.reconnected.target,
1851 host->scsi.reconnected.lun,
1852 host->scsi.reconnected.tag);
1853 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
1854 DBG(host->SCpnt, printk("scsi%d.%c: had to get command",
1855 host->host->host_no, acornscsi_target(host)));
1856 #endif
1857 }
1858
1859 if (!host->SCpnt)
1860 acornscsi_abortcmd(host, host->scsi.reconnected.tag);
1861 else {
1862 /*
1863 * Restore data pointer from SAVED pointers.
1864 */
1865 host->scsi.SCp = host->SCpnt->SCp;
1866 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
1867 printk(", data pointers: [%p, %X]",
1868 host->scsi.SCp.ptr, host->scsi.SCp.this_residual);
1869 #endif
1870 }
1871 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
1872 printk("\n");
1873 #endif
1874
1875 host->dma.transferred = host->scsi.SCp.scsi_xferred;
1876
1877 return host->SCpnt != NULL;
1878 }
1879
1880 /*
1881 * Function: void acornscsi_disconnect_unexpected(AS_Host *host)
1882 * Purpose : handle an unexpected disconnect
1883 * Params : host - host on which disconnect occurred
1884 */
1885 static
1886 void acornscsi_disconnect_unexpected(AS_Host *host)
1887 {
1888 printk(KERN_ERR "scsi%d.%c: unexpected disconnect\n",
1889 host->host->host_no, acornscsi_target(host));
1890 #if (DEBUG & DEBUG_ABORT)
1891 acornscsi_dumplog(host, 8);
1892 #endif
1893
1894 acornscsi_done(host, &host->SCpnt, DID_ERROR);
1895 }
1896
1897 /*
1898 * Function: void acornscsi_abortcmd(AS_host *host, unsigned char tag)
1899 * Purpose : abort a currently executing command
1900 * Params : host - host with connected command to abort
1901 * tag - tag to abort
1902 */
1903 static
1904 void acornscsi_abortcmd(AS_Host *host, unsigned char tag)
1905 {
1906 host->scsi.phase = PHASE_ABORTED;
1907 sbic_arm_write(host, SBIC_CMND, CMND_ASSERTATN);
1908
1909 msgqueue_flush(&host->scsi.msgs);
1910 #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
1911 if (tag)
1912 msgqueue_addmsg(&host->scsi.msgs, 2, ABORT_TAG, tag);
1913 else
1914 #endif
1915 msgqueue_addmsg(&host->scsi.msgs, 1, ABORT);
1916 }
1917
1918 /* ==========================================================================================
1919 * Interrupt routines.
1920 */
1921 /*
1922 * Function: int acornscsi_sbicintr(AS_Host *host)
1923 * Purpose : handle interrupts from SCSI device
1924 * Params : host - host to process
1925 * Returns : INTR_PROCESS if expecting another SBIC interrupt
1926 * INTR_IDLE if no interrupt
1927 * INTR_NEXT_COMMAND if we have finished processing the command
1928 */
1929 static
1930 intr_ret_t acornscsi_sbicintr(AS_Host *host, int in_irq)
1931 {
1932 unsigned int asr, ssr;
1933
1934 asr = sbic_arm_read(host, SBIC_ASR);
1935 if (!(asr & ASR_INT))
1936 return INTR_IDLE;
1937
1938 ssr = sbic_arm_read(host, SBIC_SSR);
1939
1940 #if (DEBUG & DEBUG_PHASES)
1941 print_sbic_status(asr, ssr, host->scsi.phase);
1942 #endif
1943
1944 ADD_STATUS(8, ssr, host->scsi.phase, in_irq);
1945
1946 if (host->SCpnt && !host->scsi.disconnectable)
1947 ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, in_irq);
1948
1949 switch (ssr) {
1950 case 0x00: /* reset state - not advanced */
1951 printk(KERN_ERR "scsi%d: reset in standard mode but wanted advanced mode.\n",
1952 host->host->host_no);
1953 /* setup sbic - WD33C93A */
1954 sbic_arm_write(host, SBIC_OWNID, OWNID_EAF | host->host->this_id);
1955 sbic_arm_write(host, SBIC_CMND, CMND_RESET);
1956 return INTR_IDLE;
1957
1958 case 0x01: /* reset state - advanced */
1959 sbic_arm_write(host, SBIC_CTRL, INIT_SBICDMA | CTRL_IDI);
1960 sbic_arm_write(host, SBIC_TIMEOUT, TIMEOUT_TIME);
1961 sbic_arm_write(host, SBIC_SYNCHTRANSFER, SYNCHTRANSFER_2DBA);
1962 sbic_arm_write(host, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP);
1963 msgqueue_flush(&host->scsi.msgs);
1964 return INTR_IDLE;
1965
1966 case 0x41: /* unexpected disconnect aborted command */
1967 acornscsi_disconnect_unexpected(host);
1968 return INTR_NEXT_COMMAND;
1969 }
1970
1971 switch (host->scsi.phase) {
1972 case PHASE_CONNECTING: /* STATE: command removed from issue queue */
1973 switch (ssr) {
1974 case 0x11: /* -> PHASE_CONNECTED */
1975 /* BUS FREE -> SELECTION */
1976 host->scsi.phase = PHASE_CONNECTED;
1977 msgqueue_flush(&host->scsi.msgs);
1978 host->dma.transferred = host->scsi.SCp.scsi_xferred;
1979 /* 33C93 gives next interrupt indicating bus phase */
1980 asr = sbic_arm_read(host, SBIC_ASR);
1981 if (!(asr & ASR_INT))
1982 break;
1983 ssr = sbic_arm_read(host, SBIC_SSR);
1984 ADD_STATUS(8, ssr, host->scsi.phase, 1);
1985 ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, 1);
1986 goto connected;
1987
1988 case 0x42: /* select timed out */
1989 /* -> PHASE_IDLE */
1990 acornscsi_done(host, &host->SCpnt, DID_NO_CONNECT);
1991 return INTR_NEXT_COMMAND;
1992
1993 case 0x81: /* -> PHASE_RECONNECTED or PHASE_ABORTED */
1994 /* BUS FREE -> RESELECTION */
1995 host->origSCpnt = host->SCpnt;
1996 host->SCpnt = NULL;
1997 msgqueue_flush(&host->scsi.msgs);
1998 acornscsi_reconnect(host);
1999 break;
2000
2001 default:
2002 printk(KERN_ERR "scsi%d.%c: PHASE_CONNECTING, SSR %02X?\n",
2003 host->host->host_no, acornscsi_target(host), ssr);
2004 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2005 acornscsi_abortcmd(host, host->SCpnt->tag);
2006 }
2007 return INTR_PROCESSING;
2008
2009 connected:
2010 case PHASE_CONNECTED: /* STATE: device selected ok */
2011 switch (ssr) {
2012 #ifdef NONSTANDARD
2013 case 0x8a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */
2014 /* SELECTION -> COMMAND */
2015 acornscsi_sendcommand(host);
2016 break;
2017
2018 case 0x8b: /* -> PHASE_STATUS */
2019 /* SELECTION -> STATUS */
2020 acornscsi_readstatusbyte(host);
2021 host->scsi.phase = PHASE_STATUSIN;
2022 break;
2023 #endif
2024
2025 case 0x8e: /* -> PHASE_MSGOUT */
2026 /* SELECTION ->MESSAGE OUT */
2027 host->scsi.phase = PHASE_MSGOUT;
2028 acornscsi_buildmessages(host);
2029 acornscsi_sendmessage(host);
2030 break;
2031
2032 /* these should not happen */
2033 case 0x85: /* target disconnected */
2034 acornscsi_done(host, &host->SCpnt, DID_ERROR);
2035 break;
2036
2037 default:
2038 printk(KERN_ERR "scsi%d.%c: PHASE_CONNECTED, SSR %02X?\n",
2039 host->host->host_no, acornscsi_target(host), ssr);
2040 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2041 acornscsi_abortcmd(host, host->SCpnt->tag);
2042 }
2043 return INTR_PROCESSING;
2044
2045 case PHASE_MSGOUT: /* STATE: connected & sent IDENTIFY message */
2046 /*
2047 * SCSI standard says that MESSAGE OUT phases can be followed by a
2048 * DATA phase, STATUS phase, MESSAGE IN phase or COMMAND phase
2049 */
2050 switch (ssr) {
2051 case 0x8a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */
2052 case 0x1a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */
2053 /* MESSAGE OUT -> COMMAND */
2054 acornscsi_sendcommand(host);
2055 break;
2056
2057 case 0x8b: /* -> PHASE_STATUS */
2058 case 0x1b: /* -> PHASE_STATUS */
2059 /* MESSAGE OUT -> STATUS */
2060 acornscsi_readstatusbyte(host);
2061 host->scsi.phase = PHASE_STATUSIN;
2062 break;
2063
2064 case 0x8e: /* -> PHASE_MSGOUT */
2065 /* MESSAGE_OUT(MESSAGE_IN) ->MESSAGE OUT */
2066 acornscsi_sendmessage(host);
2067 break;
2068
2069 case 0x4f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */
2070 case 0x1f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */
2071 /* MESSAGE OUT -> MESSAGE IN */
2072 acornscsi_message(host);
2073 break;
2074
2075 default:
2076 printk(KERN_ERR "scsi%d.%c: PHASE_MSGOUT, SSR %02X?\n",
2077 host->host->host_no, acornscsi_target(host), ssr);
2078 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2079 }
2080 return INTR_PROCESSING;
2081
2082 case PHASE_COMMAND: /* STATE: connected & command sent */
2083 switch (ssr) {
2084 case 0x18: /* -> PHASE_DATAOUT */
2085 /* COMMAND -> DATA OUT */
2086 if (host->scsi.SCp.sent_command != host->SCpnt->cmd_len)
2087 acornscsi_abortcmd(host, host->SCpnt->tag);
2088 acornscsi_dma_setup(host, DMA_OUT);
2089 if (!acornscsi_starttransfer(host))
2090 acornscsi_abortcmd(host, host->SCpnt->tag);
2091 host->scsi.phase = PHASE_DATAOUT;
2092 return INTR_IDLE;
2093
2094 case 0x19: /* -> PHASE_DATAIN */
2095 /* COMMAND -> DATA IN */
2096 if (host->scsi.SCp.sent_command != host->SCpnt->cmd_len)
2097 acornscsi_abortcmd(host, host->SCpnt->tag);
2098 acornscsi_dma_setup(host, DMA_IN);
2099 if (!acornscsi_starttransfer(host))
2100 acornscsi_abortcmd(host, host->SCpnt->tag);
2101 host->scsi.phase = PHASE_DATAIN;
2102 return INTR_IDLE;
2103
2104 case 0x1b: /* -> PHASE_STATUS */
2105 /* COMMAND -> STATUS */
2106 acornscsi_readstatusbyte(host);
2107 host->scsi.phase = PHASE_STATUSIN;
2108 break;
2109
2110 case 0x1e: /* -> PHASE_MSGOUT */
2111 /* COMMAND -> MESSAGE OUT */
2112 acornscsi_sendmessage(host);
2113 break;
2114
2115 case 0x1f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */
2116 /* COMMAND -> MESSAGE IN */
2117 acornscsi_message(host);
2118 break;
2119
2120 default:
2121 printk(KERN_ERR "scsi%d.%c: PHASE_COMMAND, SSR %02X?\n",
2122 host->host->host_no, acornscsi_target(host), ssr);
2123 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2124 }
2125 return INTR_PROCESSING;
2126
2127 case PHASE_DISCONNECT: /* STATE: connected, received DISCONNECT msg */
2128 if (ssr == 0x85) { /* -> PHASE_IDLE */
2129 host->scsi.disconnectable = 1;
2130 host->scsi.reconnected.tag = 0;
2131 host->scsi.phase = PHASE_IDLE;
2132 host->stats.disconnects += 1;
2133 } else {
2134 printk(KERN_ERR "scsi%d.%c: PHASE_DISCONNECT, SSR %02X instead of disconnect?\n",
2135 host->host->host_no, acornscsi_target(host), ssr);
2136 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2137 }
2138 return INTR_NEXT_COMMAND;
2139
2140 case PHASE_IDLE: /* STATE: disconnected */
2141 if (ssr == 0x81) /* -> PHASE_RECONNECTED or PHASE_ABORTED */
2142 acornscsi_reconnect(host);
2143 else {
2144 printk(KERN_ERR "scsi%d.%c: PHASE_IDLE, SSR %02X while idle?\n",
2145 host->host->host_no, acornscsi_target(host), ssr);
2146 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2147 }
2148 return INTR_PROCESSING;
2149
2150 case PHASE_RECONNECTED: /* STATE: device reconnected to initiator */
2151 /*
2152 * Command reconnected - if MESGIN, get message - it may be
2153 * the tag. If not, get command out of disconnected queue
2154 */
2155 /*
2156 * If we reconnected and we're not in MESSAGE IN phase after IDENTIFY,
2157 * reconnect I_T_L command
2158 */
2159 if (ssr != 0x8f && !acornscsi_reconnect_finish(host))
2160 return INTR_IDLE;
2161 ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, in_irq);
2162 switch (ssr) {
2163 case 0x88: /* data out phase */
2164 /* -> PHASE_DATAOUT */
2165 /* MESSAGE IN -> DATA OUT */
2166 acornscsi_dma_setup(host, DMA_OUT);
2167 if (!acornscsi_starttransfer(host))
2168 acornscsi_abortcmd(host, host->SCpnt->tag);
2169 host->scsi.phase = PHASE_DATAOUT;
2170 return INTR_IDLE;
2171
2172 case 0x89: /* data in phase */
2173 /* -> PHASE_DATAIN */
2174 /* MESSAGE IN -> DATA IN */
2175 acornscsi_dma_setup(host, DMA_IN);
2176 if (!acornscsi_starttransfer(host))
2177 acornscsi_abortcmd(host, host->SCpnt->tag);
2178 host->scsi.phase = PHASE_DATAIN;
2179 return INTR_IDLE;
2180
2181 case 0x8a: /* command out */
2182 /* MESSAGE IN -> COMMAND */
2183 acornscsi_sendcommand(host);/* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */
2184 break;
2185
2186 case 0x8b: /* status in */
2187 /* -> PHASE_STATUSIN */
2188 /* MESSAGE IN -> STATUS */
2189 acornscsi_readstatusbyte(host);
2190 host->scsi.phase = PHASE_STATUSIN;
2191 break;
2192
2193 case 0x8e: /* message out */
2194 /* -> PHASE_MSGOUT */
2195 /* MESSAGE IN -> MESSAGE OUT */
2196 acornscsi_sendmessage(host);
2197 break;
2198
2199 case 0x8f: /* message in */
2200 acornscsi_message(host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */
2201 break;
2202
2203 default:
2204 printk(KERN_ERR "scsi%d.%c: PHASE_RECONNECTED, SSR %02X after reconnect?\n",
2205 host->host->host_no, acornscsi_target(host), ssr);
2206 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2207 }
2208 return INTR_PROCESSING;
2209
2210 case PHASE_DATAIN: /* STATE: transferred data in */
2211 /*
2212 * This is simple - if we disconnect then the DMA address & count is
2213 * correct.
2214 */
2215 switch (ssr) {
2216 case 0x19: /* -> PHASE_DATAIN */
2217 case 0x89: /* -> PHASE_DATAIN */
2218 acornscsi_abortcmd(host, host->SCpnt->tag);
2219 return INTR_IDLE;
2220
2221 case 0x1b: /* -> PHASE_STATUSIN */
2222 case 0x4b: /* -> PHASE_STATUSIN */
2223 case 0x8b: /* -> PHASE_STATUSIN */
2224 /* DATA IN -> STATUS */
2225 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
2226 acornscsi_sbic_xfcount(host);
2227 acornscsi_dma_stop(host);
2228 acornscsi_readstatusbyte(host);
2229 host->scsi.phase = PHASE_STATUSIN;
2230 break;
2231
2232 case 0x1e: /* -> PHASE_MSGOUT */
2233 case 0x4e: /* -> PHASE_MSGOUT */
2234 case 0x8e: /* -> PHASE_MSGOUT */
2235 /* DATA IN -> MESSAGE OUT */
2236 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
2237 acornscsi_sbic_xfcount(host);
2238 acornscsi_dma_stop(host);
2239 acornscsi_sendmessage(host);
2240 break;
2241
2242 case 0x1f: /* message in */
2243 case 0x4f: /* message in */
2244 case 0x8f: /* message in */
2245 /* DATA IN -> MESSAGE IN */
2246 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
2247 acornscsi_sbic_xfcount(host);
2248 acornscsi_dma_stop(host);
2249 acornscsi_message(host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */
2250 break;
2251
2252 default:
2253 printk(KERN_ERR "scsi%d.%c: PHASE_DATAIN, SSR %02X?\n",
2254 host->host->host_no, acornscsi_target(host), ssr);
2255 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2256 }
2257 return INTR_PROCESSING;
2258
2259 case PHASE_DATAOUT: /* STATE: transferred data out */
2260 /*
2261 * This is more complicated - if we disconnect, the DMA could be 12
2262 * bytes ahead of us. We need to correct this.
2263 */
2264 switch (ssr) {
2265 case 0x18: /* -> PHASE_DATAOUT */
2266 case 0x88: /* -> PHASE_DATAOUT */
2267 acornscsi_abortcmd(host, host->SCpnt->tag);
2268 return INTR_IDLE;
2269
2270 case 0x1b: /* -> PHASE_STATUSIN */
2271 case 0x4b: /* -> PHASE_STATUSIN */
2272 case 0x8b: /* -> PHASE_STATUSIN */
2273 /* DATA OUT -> STATUS */
2274 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
2275 acornscsi_sbic_xfcount(host);
2276 acornscsi_dma_stop(host);
2277 acornscsi_dma_adjust(host);
2278 acornscsi_readstatusbyte(host);
2279 host->scsi.phase = PHASE_STATUSIN;
2280 break;
2281
2282 case 0x1e: /* -> PHASE_MSGOUT */
2283 case 0x4e: /* -> PHASE_MSGOUT */
2284 case 0x8e: /* -> PHASE_MSGOUT */
2285 /* DATA OUT -> MESSAGE OUT */
2286 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
2287 acornscsi_sbic_xfcount(host);
2288 acornscsi_dma_stop(host);
2289 acornscsi_dma_adjust(host);
2290 acornscsi_sendmessage(host);
2291 break;
2292
2293 case 0x1f: /* message in */
2294 case 0x4f: /* message in */
2295 case 0x8f: /* message in */
2296 /* DATA OUT -> MESSAGE IN */
2297 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
2298 acornscsi_sbic_xfcount(host);
2299 acornscsi_dma_stop(host);
2300 acornscsi_dma_adjust(host);
2301 acornscsi_message(host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */
2302 break;
2303
2304 default:
2305 printk(KERN_ERR "scsi%d.%c: PHASE_DATAOUT, SSR %02X?\n",
2306 host->host->host_no, acornscsi_target(host), ssr);
2307 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2308 }
2309 return INTR_PROCESSING;
2310
2311 case PHASE_STATUSIN: /* STATE: status in complete */
2312 switch (ssr) {
2313 case 0x1f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */
2314 case 0x8f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */
2315 /* STATUS -> MESSAGE IN */
2316 acornscsi_message(host);
2317 break;
2318
2319 case 0x1e: /* -> PHASE_MSGOUT */
2320 case 0x8e: /* -> PHASE_MSGOUT */
2321 /* STATUS -> MESSAGE OUT */
2322 acornscsi_sendmessage(host);
2323 break;
2324
2325 default:
2326 printk(KERN_ERR "scsi%d.%c: PHASE_STATUSIN, SSR %02X instead of MESSAGE_IN?\n",
2327 host->host->host_no, acornscsi_target(host), ssr);
2328 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2329 }
2330 return INTR_PROCESSING;
2331
2332 case PHASE_MSGIN: /* STATE: message in */
2333 switch (ssr) {
2334 case 0x1e: /* -> PHASE_MSGOUT */
2335 case 0x4e: /* -> PHASE_MSGOUT */
2336 case 0x8e: /* -> PHASE_MSGOUT */
2337 /* MESSAGE IN -> MESSAGE OUT */
2338 acornscsi_sendmessage(host);
2339 break;
2340
2341 case 0x1f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */
2342 case 0x2f:
2343 case 0x4f:
2344 case 0x8f:
2345 acornscsi_message(host);
2346 break;
2347
2348 case 0x85:
2349 printk("scsi%d.%c: strange message in disconnection\n",
2350 host->host->host_no, acornscsi_target(host));
2351 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2352 acornscsi_done(host, &host->SCpnt, DID_ERROR);
2353 break;
2354
2355 default:
2356 printk(KERN_ERR "scsi%d.%c: PHASE_MSGIN, SSR %02X after message in?\n",
2357 host->host->host_no, acornscsi_target(host), ssr);
2358 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2359 }
2360 return INTR_PROCESSING;
2361
2362 case PHASE_DONE: /* STATE: received status & message */
2363 switch (ssr) {
2364 case 0x85: /* -> PHASE_IDLE */
2365 acornscsi_done(host, &host->SCpnt, DID_OK);
2366 return INTR_NEXT_COMMAND;
2367
2368 case 0x1e:
2369 case 0x8e:
2370 acornscsi_sendmessage(host);
2371 break;
2372
2373 default:
2374 printk(KERN_ERR "scsi%d.%c: PHASE_DONE, SSR %02X instead of disconnect?\n",
2375 host->host->host_no, acornscsi_target(host), ssr);
2376 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2377 }
2378 return INTR_PROCESSING;
2379
2380 case PHASE_ABORTED:
2381 switch (ssr) {
2382 case 0x85:
2383 if (host->SCpnt)
2384 acornscsi_done(host, &host->SCpnt, DID_ABORT);
2385 else {
2386 clear_bit(host->scsi.reconnected.target * 8 + host->scsi.reconnected.lun,
2387 host->busyluns);
2388 host->scsi.phase = PHASE_IDLE;
2389 }
2390 return INTR_NEXT_COMMAND;
2391
2392 case 0x1e:
2393 case 0x2e:
2394 case 0x4e:
2395 case 0x8e:
2396 acornscsi_sendmessage(host);
2397 break;
2398
2399 default:
2400 printk(KERN_ERR "scsi%d.%c: PHASE_ABORTED, SSR %02X?\n",
2401 host->host->host_no, acornscsi_target(host), ssr);
2402 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2403 }
2404 return INTR_PROCESSING;
2405
2406 default:
2407 printk(KERN_ERR "scsi%d.%c: unknown driver phase %d\n",
2408 host->host->host_no, acornscsi_target(host), ssr);
2409 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2410 }
2411 return INTR_PROCESSING;
2412 }
2413
2414 /*
2415 * Prototype: void acornscsi_intr(int irq, void *dev_id)
2416 * Purpose : handle interrupts from Acorn SCSI card
2417 * Params : irq - interrupt number
2418 * dev_id - device specific data (AS_Host structure)
2419 */
2420 static irqreturn_t
2421 acornscsi_intr(int irq, void *dev_id)
2422 {
2423 AS_Host *host = (AS_Host *)dev_id;
2424 intr_ret_t ret;
2425 int iostatus;
2426 int in_irq = 0;
2427
2428 do {
2429 ret = INTR_IDLE;
2430
2431 iostatus = readb(host->fast + INT_REG);
2432
2433 if (iostatus & 2) {
2434 acornscsi_dma_intr(host);
2435 iostatus = readb(host->fast + INT_REG);
2436 }
2437
2438 if (iostatus & 8)
2439 ret = acornscsi_sbicintr(host, in_irq);
2440
2441 /*
2442 * If we have a transfer pending, start it.
2443 * Only start it if the interface has already started transferring
2444 * it's data
2445 */
2446 if (host->dma.xfer_required)
2447 acornscsi_dma_xfer(host);
2448
2449 if (ret == INTR_NEXT_COMMAND)
2450 ret = acornscsi_kick(host);
2451
2452 in_irq = 1;
2453 } while (ret != INTR_IDLE);
2454
2455 return IRQ_HANDLED;
2456 }
2457
2458 /*=============================================================================================
2459 * Interfaces between interrupt handler and rest of scsi code
2460 */
2461
2462 /*
2463 * Function : acornscsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
2464 * Purpose : queues a SCSI command
2465 * Params : cmd - SCSI command
2466 * done - function called on completion, with pointer to command descriptor
2467 * Returns : 0, or < 0 on error.
2468 */
2469 static int acornscsi_queuecmd_lck(struct scsi_cmnd *SCpnt,
2470 void (*done)(struct scsi_cmnd *))
2471 {
2472 AS_Host *host = (AS_Host *)SCpnt->device->host->hostdata;
2473
2474 if (!done) {
2475 /* there should be some way of rejecting errors like this without panicing... */
2476 panic("scsi%d: queuecommand called with NULL done function [cmd=%p]",
2477 host->host->host_no, SCpnt);
2478 return -EINVAL;
2479 }
2480
2481 #if (DEBUG & DEBUG_NO_WRITE)
2482 if (acornscsi_cmdtype(SCpnt->cmnd[0]) == CMD_WRITE && (NO_WRITE & (1 << SCpnt->device->id))) {
2483 printk(KERN_CRIT "scsi%d.%c: WRITE attempted with NO_WRITE flag set\n",
2484 host->host->host_no, '0' + SCpnt->device->id);
2485 SCpnt->result = DID_NO_CONNECT << 16;
2486 done(SCpnt);
2487 return 0;
2488 }
2489 #endif
2490
2491 SCpnt->scsi_done = done;
2492 SCpnt->host_scribble = NULL;
2493 SCpnt->result = 0;
2494 SCpnt->tag = 0;
2495 SCpnt->SCp.phase = (int)acornscsi_datadirection(SCpnt->cmnd[0]);
2496 SCpnt->SCp.sent_command = 0;
2497 SCpnt->SCp.scsi_xferred = 0;
2498
2499 init_SCp(SCpnt);
2500
2501 host->stats.queues += 1;
2502
2503 {
2504 unsigned long flags;
2505
2506 if (!queue_add_cmd_ordered(&host->queues.issue, SCpnt)) {
2507 SCpnt->result = DID_ERROR << 16;
2508 done(SCpnt);
2509 return 0;
2510 }
2511 local_irq_save(flags);
2512 if (host->scsi.phase == PHASE_IDLE)
2513 acornscsi_kick(host);
2514 local_irq_restore(flags);
2515 }
2516 return 0;
2517 }
2518
2519 DEF_SCSI_QCMD(acornscsi_queuecmd)
2520
2521 /*
2522 * Prototype: void acornscsi_reportstatus(struct scsi_cmnd **SCpntp1, struct scsi_cmnd **SCpntp2, int result)
2523 * Purpose : pass a result to *SCpntp1, and check if *SCpntp1 = *SCpntp2
2524 * Params : SCpntp1 - pointer to command to return
2525 * SCpntp2 - pointer to command to check
2526 * result - result to pass back to mid-level done function
2527 * Returns : *SCpntp2 = NULL if *SCpntp1 is the same command structure as *SCpntp2.
2528 */
2529 static inline void acornscsi_reportstatus(struct scsi_cmnd **SCpntp1,
2530 struct scsi_cmnd **SCpntp2,
2531 int result)
2532 {
2533 struct scsi_cmnd *SCpnt = *SCpntp1;
2534
2535 if (SCpnt) {
2536 *SCpntp1 = NULL;
2537
2538 SCpnt->result = result;
2539 SCpnt->scsi_done(SCpnt);
2540 }
2541
2542 if (SCpnt == *SCpntp2)
2543 *SCpntp2 = NULL;
2544 }
2545
2546 enum res_abort { res_not_running, res_success, res_success_clear, res_snooze };
2547
2548 /*
2549 * Prototype: enum res acornscsi_do_abort(struct scsi_cmnd *SCpnt)
2550 * Purpose : abort a command on this host
2551 * Params : SCpnt - command to abort
2552 * Returns : our abort status
2553 */
2554 static enum res_abort acornscsi_do_abort(AS_Host *host, struct scsi_cmnd *SCpnt)
2555 {
2556 enum res_abort res = res_not_running;
2557
2558 if (queue_remove_cmd(&host->queues.issue, SCpnt)) {
2559 /*
2560 * The command was on the issue queue, and has not been
2561 * issued yet. We can remove the command from the queue,
2562 * and acknowledge the abort. Neither the devices nor the
2563 * interface know about the command.
2564 */
2565 //#if (DEBUG & DEBUG_ABORT)
2566 printk("on issue queue ");
2567 //#endif
2568 res = res_success;
2569 } else if (queue_remove_cmd(&host->queues.disconnected, SCpnt)) {
2570 /*
2571 * The command was on the disconnected queue. Simply
2572 * acknowledge the abort condition, and when the target
2573 * reconnects, we will give it an ABORT message. The
2574 * target should then disconnect, and we will clear
2575 * the busylun bit.
2576 */
2577 //#if (DEBUG & DEBUG_ABORT)
2578 printk("on disconnected queue ");
2579 //#endif
2580 res = res_success;
2581 } else if (host->SCpnt == SCpnt) {
2582 unsigned long flags;
2583
2584 //#if (DEBUG & DEBUG_ABORT)
2585 printk("executing ");
2586 //#endif
2587
2588 local_irq_save(flags);
2589 switch (host->scsi.phase) {
2590 /*
2591 * If the interface is idle, and the command is 'disconnectable',
2592 * then it is the same as on the disconnected queue. We simply
2593 * remove all traces of the command. When the target reconnects,
2594 * we will give it an ABORT message since the command could not
2595 * be found. When the target finally disconnects, we will clear
2596 * the busylun bit.
2597 */
2598 case PHASE_IDLE:
2599 if (host->scsi.disconnectable) {
2600 host->scsi.disconnectable = 0;
2601 host->SCpnt = NULL;
2602 res = res_success;
2603 }
2604 break;
2605
2606 /*
2607 * If the command has connected and done nothing further,
2608 * simply force a disconnect. We also need to clear the
2609 * busylun bit.
2610 */
2611 case PHASE_CONNECTED:
2612 sbic_arm_write(host, SBIC_CMND, CMND_DISCONNECT);
2613 host->SCpnt = NULL;
2614 res = res_success_clear;
2615 break;
2616
2617 default:
2618 acornscsi_abortcmd(host, host->SCpnt->tag);
2619 res = res_snooze;
2620 }
2621 local_irq_restore(flags);
2622 } else if (host->origSCpnt == SCpnt) {
2623 /*
2624 * The command will be executed next, but a command
2625 * is currently using the interface. This is similar to
2626 * being on the issue queue, except the busylun bit has
2627 * been set.
2628 */
2629 host->origSCpnt = NULL;
2630 //#if (DEBUG & DEBUG_ABORT)
2631 printk("waiting for execution ");
2632 //#endif
2633 res = res_success_clear;
2634 } else
2635 printk("unknown ");
2636
2637 return res;
2638 }
2639
2640 /*
2641 * Prototype: int acornscsi_abort(struct scsi_cmnd *SCpnt)
2642 * Purpose : abort a command on this host
2643 * Params : SCpnt - command to abort
2644 * Returns : one of SCSI_ABORT_ macros
2645 */
2646 int acornscsi_abort(struct scsi_cmnd *SCpnt)
2647 {
2648 AS_Host *host = (AS_Host *) SCpnt->device->host->hostdata;
2649 int result;
2650
2651 host->stats.aborts += 1;
2652
2653 #if (DEBUG & DEBUG_ABORT)
2654 {
2655 int asr, ssr;
2656 asr = sbic_arm_read(host, SBIC_ASR);
2657 ssr = sbic_arm_read(host, SBIC_SSR);
2658
2659 printk(KERN_WARNING "acornscsi_abort: ");
2660 print_sbic_status(asr, ssr, host->scsi.phase);
2661 acornscsi_dumplog(host, SCpnt->device->id);
2662 }
2663 #endif
2664
2665 printk("scsi%d: ", host->host->host_no);
2666
2667 switch (acornscsi_do_abort(host, SCpnt)) {
2668 /*
2669 * We managed to find the command and cleared it out.
2670 * We do not expect the command to be executing on the
2671 * target, but we have set the busylun bit.
2672 */
2673 case res_success_clear:
2674 //#if (DEBUG & DEBUG_ABORT)
2675 printk("clear ");
2676 //#endif
2677 clear_bit(SCpnt->device->id * 8 +
2678 (u8)(SCpnt->device->lun & 0x7), host->busyluns);
2679
2680 /*
2681 * We found the command, and cleared it out. Either
2682 * the command is still known to be executing on the
2683 * target, or the busylun bit is not set.
2684 */
2685 case res_success:
2686 //#if (DEBUG & DEBUG_ABORT)
2687 printk("success\n");
2688 //#endif
2689 result = SUCCESS;
2690 break;
2691
2692 /*
2693 * We did find the command, but unfortunately we couldn't
2694 * unhook it from ourselves. Wait some more, and if it
2695 * still doesn't complete, reset the interface.
2696 */
2697 case res_snooze:
2698 //#if (DEBUG & DEBUG_ABORT)
2699 printk("snooze\n");
2700 //#endif
2701 result = FAILED;
2702 break;
2703
2704 /*
2705 * The command could not be found (either because it completed,
2706 * or it got dropped.
2707 */
2708 default:
2709 case res_not_running:
2710 acornscsi_dumplog(host, SCpnt->device->id);
2711 result = FAILED;
2712 //#if (DEBUG & DEBUG_ABORT)
2713 printk("not running\n");
2714 //#endif
2715 break;
2716 }
2717
2718 return result;
2719 }
2720
2721 /*
2722 * Prototype: int acornscsi_reset(struct scsi_cmnd *SCpnt)
2723 * Purpose : reset a command on this host/reset this host
2724 * Params : SCpnt - command causing reset
2725 * Returns : one of SCSI_RESET_ macros
2726 */
2727 int acornscsi_bus_reset(struct scsi_cmnd *SCpnt)
2728 {
2729 AS_Host *host = (AS_Host *)SCpnt->device->host->hostdata;
2730 struct scsi_cmnd *SCptr;
2731
2732 host->stats.resets += 1;
2733
2734 #if (DEBUG & DEBUG_RESET)
2735 {
2736 int asr, ssr;
2737
2738 asr = sbic_arm_read(host, SBIC_ASR);
2739 ssr = sbic_arm_read(host, SBIC_SSR);
2740
2741 printk(KERN_WARNING "acornscsi_reset: ");
2742 print_sbic_status(asr, ssr, host->scsi.phase);
2743 acornscsi_dumplog(host, SCpnt->device->id);
2744 }
2745 #endif
2746
2747 acornscsi_dma_stop(host);
2748
2749 /*
2750 * do hard reset. This resets all devices on this host, and so we
2751 * must set the reset status on all commands.
2752 */
2753 acornscsi_resetcard(host);
2754
2755 while ((SCptr = queue_remove(&host->queues.disconnected)) != NULL)
2756 ;
2757
2758 return SUCCESS;
2759 }
2760
2761 /*==============================================================================================
2762 * initialisation & miscellaneous support
2763 */
2764
2765 /*
2766 * Function: char *acornscsi_info(struct Scsi_Host *host)
2767 * Purpose : return a string describing this interface
2768 * Params : host - host to give information on
2769 * Returns : a constant string
2770 */
2771 const
2772 char *acornscsi_info(struct Scsi_Host *host)
2773 {
2774 static char string[100], *p;
2775
2776 p = string;
2777
2778 p += sprintf(string, "%s at port %08lX irq %d v%d.%d.%d"
2779 #ifdef CONFIG_SCSI_ACORNSCSI_SYNC
2780 " SYNC"
2781 #endif
2782 #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
2783 " TAG"
2784 #endif
2785 #if (DEBUG & DEBUG_NO_WRITE)
2786 " NOWRITE (" __stringify(NO_WRITE) ")"
2787 #endif
2788 , host->hostt->name, host->io_port, host->irq,
2789 VER_MAJOR, VER_MINOR, VER_PATCH);
2790 return string;
2791 }
2792
2793 static int acornscsi_show_info(struct seq_file *m, struct Scsi_Host *instance)
2794 {
2795 int devidx;
2796 struct scsi_device *scd;
2797 AS_Host *host;
2798
2799 host = (AS_Host *)instance->hostdata;
2800
2801 seq_printf(m, "AcornSCSI driver v%d.%d.%d"
2802 #ifdef CONFIG_SCSI_ACORNSCSI_SYNC
2803 " SYNC"
2804 #endif
2805 #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
2806 " TAG"
2807 #endif
2808 #if (DEBUG & DEBUG_NO_WRITE)
2809 " NOWRITE (" __stringify(NO_WRITE) ")"
2810 #endif
2811 "\n\n", VER_MAJOR, VER_MINOR, VER_PATCH);
2812
2813 seq_printf(m, "SBIC: WD33C93A Address: %p IRQ : %d\n",
2814 host->base + SBIC_REGIDX, host->scsi.irq);
2815 #ifdef USE_DMAC
2816 seq_printf(m, "DMAC: uPC71071 Address: %p IRQ : %d\n\n",
2817 host->base + DMAC_OFFSET, host->scsi.irq);
2818 #endif
2819
2820 seq_printf(m, "Statistics:\n"
2821 "Queued commands: %-10u Issued commands: %-10u\n"
2822 "Done commands : %-10u Reads : %-10u\n"
2823 "Writes : %-10u Others : %-10u\n"
2824 "Disconnects : %-10u Aborts : %-10u\n"
2825 "Resets : %-10u\n\nLast phases:",
2826 host->stats.queues, host->stats.removes,
2827 host->stats.fins, host->stats.reads,
2828 host->stats.writes, host->stats.miscs,
2829 host->stats.disconnects, host->stats.aborts,
2830 host->stats.resets);
2831
2832 for (devidx = 0; devidx < 9; devidx ++) {
2833 unsigned int statptr, prev;
2834
2835 seq_printf(m, "\n%c:", devidx == 8 ? 'H' : ('0' + devidx));
2836 statptr = host->status_ptr[devidx] - 10;
2837
2838 if ((signed int)statptr < 0)
2839 statptr += STATUS_BUFFER_SIZE;
2840
2841 prev = host->status[devidx][statptr].when;
2842
2843 for (; statptr != host->status_ptr[devidx]; statptr = (statptr + 1) & (STATUS_BUFFER_SIZE - 1)) {
2844 if (host->status[devidx][statptr].when) {
2845 seq_printf(m, "%c%02X:%02X+%2ld",
2846 host->status[devidx][statptr].irq ? '-' : ' ',
2847 host->status[devidx][statptr].ph,
2848 host->status[devidx][statptr].ssr,
2849 (host->status[devidx][statptr].when - prev) < 100 ?
2850 (host->status[devidx][statptr].when - prev) : 99);
2851 prev = host->status[devidx][statptr].when;
2852 }
2853 }
2854 }
2855
2856 seq_printf(m, "\nAttached devices:\n");
2857
2858 shost_for_each_device(scd, instance) {
2859 seq_printf(m, "Device/Lun TaggedQ Sync\n");
2860 seq_printf(m, " %d/%llu ", scd->id, scd->lun);
2861 if (scd->tagged_supported)
2862 seq_printf(m, "%3sabled(%3d) ",
2863 scd->simple_tags ? "en" : "dis",
2864 scd->current_tag);
2865 else
2866 seq_printf(m, "unsupported ");
2867
2868 if (host->device[scd->id].sync_xfer & 15)
2869 seq_printf(m, "offset %d, %d ns\n",
2870 host->device[scd->id].sync_xfer & 15,
2871 acornscsi_getperiod(host->device[scd->id].sync_xfer));
2872 else
2873 seq_printf(m, "async\n");
2874
2875 }
2876 return 0;
2877 }
2878
2879 static struct scsi_host_template acornscsi_template = {
2880 .module = THIS_MODULE,
2881 .show_info = acornscsi_show_info,
2882 .name = "AcornSCSI",
2883 .info = acornscsi_info,
2884 .queuecommand = acornscsi_queuecmd,
2885 .eh_abort_handler = acornscsi_abort,
2886 .eh_bus_reset_handler = acornscsi_bus_reset,
2887 .can_queue = 16,
2888 .this_id = 7,
2889 .sg_tablesize = SG_ALL,
2890 .cmd_per_lun = 2,
2891 .use_clustering = DISABLE_CLUSTERING,
2892 .proc_name = "acornscsi",
2893 };
2894
2895 static int acornscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
2896 {
2897 struct Scsi_Host *host;
2898 AS_Host *ashost;
2899 int ret;
2900
2901 ret = ecard_request_resources(ec);
2902 if (ret)
2903 goto out;
2904
2905 host = scsi_host_alloc(&acornscsi_template, sizeof(AS_Host));
2906 if (!host) {
2907 ret = -ENOMEM;
2908 goto out_release;
2909 }
2910
2911 ashost = (AS_Host *)host->hostdata;
2912
2913 ashost->base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
2914 ashost->fast = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
2915 if (!ashost->base || !ashost->fast)
2916 goto out_put;
2917
2918 host->irq = ec->irq;
2919 ashost->host = host;
2920 ashost->scsi.irq = host->irq;
2921
2922 ec->irqaddr = ashost->fast + INT_REG;
2923 ec->irqmask = 0x0a;
2924
2925 ret = request_irq(host->irq, acornscsi_intr, 0, "acornscsi", ashost);
2926 if (ret) {
2927 printk(KERN_CRIT "scsi%d: IRQ%d not free: %d\n",
2928 host->host_no, ashost->scsi.irq, ret);
2929 goto out_put;
2930 }
2931
2932 memset(&ashost->stats, 0, sizeof (ashost->stats));
2933 queue_initialise(&ashost->queues.issue);
2934 queue_initialise(&ashost->queues.disconnected);
2935 msgqueue_initialise(&ashost->scsi.msgs);
2936
2937 acornscsi_resetcard(ashost);
2938
2939 ret = scsi_add_host(host, &ec->dev);
2940 if (ret)
2941 goto out_irq;
2942
2943 scsi_scan_host(host);
2944 goto out;
2945
2946 out_irq:
2947 free_irq(host->irq, ashost);
2948 msgqueue_free(&ashost->scsi.msgs);
2949 queue_free(&ashost->queues.disconnected);
2950 queue_free(&ashost->queues.issue);
2951 out_put:
2952 ecardm_iounmap(ec, ashost->fast);
2953 ecardm_iounmap(ec, ashost->base);
2954 scsi_host_put(host);
2955 out_release:
2956 ecard_release_resources(ec);
2957 out:
2958 return ret;
2959 }
2960
2961 static void acornscsi_remove(struct expansion_card *ec)
2962 {
2963 struct Scsi_Host *host = ecard_get_drvdata(ec);
2964 AS_Host *ashost = (AS_Host *)host->hostdata;
2965
2966 ecard_set_drvdata(ec, NULL);
2967 scsi_remove_host(host);
2968
2969 /*
2970 * Put card into RESET state
2971 */
2972 writeb(0x80, ashost->fast + PAGE_REG);
2973
2974 free_irq(host->irq, ashost);
2975
2976 msgqueue_free(&ashost->scsi.msgs);
2977 queue_free(&ashost->queues.disconnected);
2978 queue_free(&ashost->queues.issue);
2979 ecardm_iounmap(ec, ashost->fast);
2980 ecardm_iounmap(ec, ashost->base);
2981 scsi_host_put(host);
2982 ecard_release_resources(ec);
2983 }
2984
2985 static const struct ecard_id acornscsi_cids[] = {
2986 { MANU_ACORN, PROD_ACORN_SCSI },
2987 { 0xffff, 0xffff },
2988 };
2989
2990 static struct ecard_driver acornscsi_driver = {
2991 .probe = acornscsi_probe,
2992 .remove = acornscsi_remove,
2993 .id_table = acornscsi_cids,
2994 .drv = {
2995 .name = "acornscsi",
2996 },
2997 };
2998
2999 static int __init acornscsi_init(void)
3000 {
3001 return ecard_register_driver(&acornscsi_driver);
3002 }
3003
3004 static void __exit acornscsi_exit(void)
3005 {
3006 ecard_remove_driver(&acornscsi_driver);
3007 }
3008
3009 module_init(acornscsi_init);
3010 module_exit(acornscsi_exit);
3011
3012 MODULE_AUTHOR("Russell King");
3013 MODULE_DESCRIPTION("AcornSCSI driver");
3014 MODULE_LICENSE("GPL");
Linux with added FPC-III support