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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / scsi / arm / acornscsi.c
blobc454e44cf51c6653b8fd050c681ba64eea719b63
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 Linked command support.
66 *
67 * The higher level code doesn't support linked commands yet, and so the option
68 * is undef'd here.
69 */
70 #undef CONFIG_SCSI_ACORNSCSI_LINK
71 /*
72 * SCSI-II Synchronous transfer support.
73 *
74 * Tried and tested...
75 *
76 * SDTR_SIZE - maximum number of un-acknowledged bytes (0 = off, 12 = max)
77 * SDTR_PERIOD - period of REQ signal (min=125, max=1020)
78 * DEFAULT_PERIOD - default REQ period.
79 */
80 #define SDTR_SIZE 12
81 #define SDTR_PERIOD 125
82 #define DEFAULT_PERIOD 500
83
84 /*
85 * Debugging information
86 *
87 * DEBUG - bit mask from list above
88 * DEBUG_TARGET - is defined to the target number if you want to debug
89 * a specific target. [only recon/write/dma].
90 */
91 #define DEBUG (DEBUG_RESET|DEBUG_WRITE|DEBUG_NO_WRITE)
92 /* only allow writing to SCSI device 0 */
93 #define NO_WRITE 0xFE
94 /*#define DEBUG_TARGET 2*/
95 /*
96 * Select timeout time (in 10ms units)
97 *
98 * This is the timeout used between the start of selection and the WD33C93
99 * chip deciding that the device isn't responding.
100 */
101 #define TIMEOUT_TIME 10
102 /*
103 * Define this if you want to have verbose explanation of SCSI
104 * status/messages.
105 */
106 #undef CONFIG_ACORNSCSI_CONSTANTS
107 /*
108 * Define this if you want to use the on board DMAC [don't remove this option]
109 * If not set, then use PIO mode (not currently supported).
110 */
111 #define USE_DMAC
112
113 /*
114 * ====================================================================================
115 */
116
117 #ifdef DEBUG_TARGET
118 #define DBG(cmd,xxx...) \
119 if (cmd->device->id == DEBUG_TARGET) { \
120 xxx; \
121 }
122 #else
123 #define DBG(cmd,xxx...) xxx
124 #endif
125
126 #include <linux/module.h>
127 #include <linux/kernel.h>
128 #include <linux/string.h>
129 #include <linux/signal.h>
130 #include <linux/errno.h>
131 #include <linux/proc_fs.h>
132 #include <linux/ioport.h>
133 #include <linux/blkdev.h>
134 #include <linux/delay.h>
135 #include <linux/interrupt.h>
136 #include <linux/init.h>
137 #include <linux/bitops.h>
138 #include <linux/stringify.h>
139 #include <linux/io.h>
140
141 #include <asm/system.h>
142 #include <asm/ecard.h>
143
144 #include "../scsi.h"
145 #include <scsi/scsi_dbg.h>
146 #include <scsi/scsi_host.h>
147 #include <scsi/scsi_transport_spi.h>
148 #include "acornscsi.h"
149 #include "msgqueue.h"
150 #include "scsi.h"
151
152 #include <scsi/scsicam.h>
153
154 #define VER_MAJOR 2
155 #define VER_MINOR 0
156 #define VER_PATCH 6
157
158 #ifndef ABORT_TAG
159 #define ABORT_TAG 0xd
160 #else
161 #error "Yippee! ABORT TAG is now defined! Remove this error!"
162 #endif
163
164 #ifdef CONFIG_SCSI_ACORNSCSI_LINK
165 #error SCSI2 LINKed commands not supported (yet)!
166 #endif
167
168 #ifdef USE_DMAC
169 /*
170 * DMAC setup parameters
171 */
172 #define INIT_DEVCON0 (DEVCON0_RQL|DEVCON0_EXW|DEVCON0_CMP)
173 #define INIT_DEVCON1 (DEVCON1_BHLD)
174 #define DMAC_READ (MODECON_READ)
175 #define DMAC_WRITE (MODECON_WRITE)
176 #define INIT_SBICDMA (CTRL_DMABURST)
177
178 #define scsi_xferred have_data_in
179
180 /*
181 * Size of on-board DMA buffer
182 */
183 #define DMAC_BUFFER_SIZE 65536
184 #endif
185
186 #define STATUS_BUFFER_TO_PRINT 24
187
188 unsigned int sdtr_period = SDTR_PERIOD;
189 unsigned int sdtr_size = SDTR_SIZE;
190
191 static void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp,
192 unsigned int result);
193 static int acornscsi_reconnect_finish(AS_Host *host);
194 static void acornscsi_dma_cleanup(AS_Host *host);
195 static void acornscsi_abortcmd(AS_Host *host, unsigned char tag);
196
197 /* ====================================================================================
198 * Miscellaneous
199 */
200
201 /* Offsets from MEMC base */
202 #define SBIC_REGIDX 0x2000
203 #define SBIC_REGVAL 0x2004
204 #define DMAC_OFFSET 0x3000
205
206 /* Offsets from FAST IOC base */
207 #define INT_REG 0x2000
208 #define PAGE_REG 0x3000
209
210 static inline void sbic_arm_write(AS_Host *host, unsigned int reg, unsigned int value)
211 {
212 writeb(reg, host->base + SBIC_REGIDX);
213 writeb(value, host->base + SBIC_REGVAL);
214 }
215
216 static inline int sbic_arm_read(AS_Host *host, unsigned int reg)
217 {
218 if(reg == SBIC_ASR)
219 return readl(host->base + SBIC_REGIDX) & 255;
220 writeb(reg, host->base + SBIC_REGIDX);
221 return readl(host->base + SBIC_REGVAL) & 255;
222 }
223
224 #define sbic_arm_writenext(host, val) writeb((val), (host)->base + SBIC_REGVAL)
225 #define sbic_arm_readnext(host) readb((host)->base + SBIC_REGVAL)
226
227 #ifdef USE_DMAC
228 #define dmac_read(host,reg) \
229 readb((host)->base + DMAC_OFFSET + ((reg) << 2))
230
231 #define dmac_write(host,reg,value) \
232 ({ writeb((value), (host)->base + DMAC_OFFSET + ((reg) << 2)); })
233
234 #define dmac_clearintr(host) writeb(0, (host)->fast + INT_REG)
235
236 static inline unsigned int dmac_address(AS_Host *host)
237 {
238 return dmac_read(host, DMAC_TXADRHI) << 16 |
239 dmac_read(host, DMAC_TXADRMD) << 8 |
240 dmac_read(host, DMAC_TXADRLO);
241 }
242
243 static
244 void acornscsi_dumpdma(AS_Host *host, char *where)
245 {
246 unsigned int mode, addr, len;
247
248 mode = dmac_read(host, DMAC_MODECON);
249 addr = dmac_address(host);
250 len = dmac_read(host, DMAC_TXCNTHI) << 8 |
251 dmac_read(host, DMAC_TXCNTLO);
252
253 printk("scsi%d: %s: DMAC %02x @%06x+%04x msk %02x, ",
254 host->host->host_no, where,
255 mode, addr, (len + 1) & 0xffff,
256 dmac_read(host, DMAC_MASKREG));
257
258 printk("DMA @%06x, ", host->dma.start_addr);
259 printk("BH @%p +%04x, ", host->scsi.SCp.ptr,
260 host->scsi.SCp.this_residual);
261 printk("DT @+%04x ST @+%04x", host->dma.transferred,
262 host->scsi.SCp.scsi_xferred);
263 printk("\n");
264 }
265 #endif
266
267 static
268 unsigned long acornscsi_sbic_xfcount(AS_Host *host)
269 {
270 unsigned long length;
271
272 length = sbic_arm_read(host, SBIC_TRANSCNTH) << 16;
273 length |= sbic_arm_readnext(host) << 8;
274 length |= sbic_arm_readnext(host);
275
276 return length;
277 }
278
279 static int
280 acornscsi_sbic_wait(AS_Host *host, int stat_mask, int stat, int timeout, char *msg)
281 {
282 int asr;
283
284 do {
285 asr = sbic_arm_read(host, SBIC_ASR);
286
287 if ((asr & stat_mask) == stat)
288 return 0;
289
290 udelay(1);
291 } while (--timeout);
292
293 printk("scsi%d: timeout while %s\n", host->host->host_no, msg);
294
295 return -1;
296 }
297
298 static
299 int acornscsi_sbic_issuecmd(AS_Host *host, int command)
300 {
301 if (acornscsi_sbic_wait(host, ASR_CIP, 0, 1000, "issuing command"))
302 return -1;
303
304 sbic_arm_write(host, SBIC_CMND, command);
305
306 return 0;
307 }
308
309 static void
310 acornscsi_csdelay(unsigned int cs)
311 {
312 unsigned long target_jiffies, flags;
313
314 target_jiffies = jiffies + 1 + cs * HZ / 100;
315
316 local_save_flags(flags);
317 local_irq_enable();
318
319 while (time_before(jiffies, target_jiffies)) barrier();
320
321 local_irq_restore(flags);
322 }
323
324 static
325 void acornscsi_resetcard(AS_Host *host)
326 {
327 unsigned int i, timeout;
328
329 /* assert reset line */
330 host->card.page_reg = 0x80;
331 writeb(host->card.page_reg, host->fast + PAGE_REG);
332
333 /* wait 3 cs. SCSI standard says 25ms. */
334 acornscsi_csdelay(3);
335
336 host->card.page_reg = 0;
337 writeb(host->card.page_reg, host->fast + PAGE_REG);
338
339 /*
340 * Should get a reset from the card
341 */
342 timeout = 1000;
343 do {
344 if (readb(host->fast + INT_REG) & 8)
345 break;
346 udelay(1);
347 } while (--timeout);
348
349 if (timeout == 0)
350 printk("scsi%d: timeout while resetting card\n",
351 host->host->host_no);
352
353 sbic_arm_read(host, SBIC_ASR);
354 sbic_arm_read(host, SBIC_SSR);
355
356 /* setup sbic - WD33C93A */
357 sbic_arm_write(host, SBIC_OWNID, OWNID_EAF | host->host->this_id);
358 sbic_arm_write(host, SBIC_CMND, CMND_RESET);
359
360 /*
361 * Command should cause a reset interrupt
362 */
363 timeout = 1000;
364 do {
365 if (readb(host->fast + INT_REG) & 8)
366 break;
367 udelay(1);
368 } while (--timeout);
369
370 if (timeout == 0)
371 printk("scsi%d: timeout while resetting card\n",
372 host->host->host_no);
373
374 sbic_arm_read(host, SBIC_ASR);
375 if (sbic_arm_read(host, SBIC_SSR) != 0x01)
376 printk(KERN_CRIT "scsi%d: WD33C93A didn't give enhanced reset interrupt\n",
377 host->host->host_no);
378
379 sbic_arm_write(host, SBIC_CTRL, INIT_SBICDMA | CTRL_IDI);
380 sbic_arm_write(host, SBIC_TIMEOUT, TIMEOUT_TIME);
381 sbic_arm_write(host, SBIC_SYNCHTRANSFER, SYNCHTRANSFER_2DBA);
382 sbic_arm_write(host, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP);
383
384 host->card.page_reg = 0x40;
385 writeb(host->card.page_reg, host->fast + PAGE_REG);
386
387 /* setup dmac - uPC71071 */
388 dmac_write(host, DMAC_INIT, 0);
389 #ifdef USE_DMAC
390 dmac_write(host, DMAC_INIT, INIT_8BIT);
391 dmac_write(host, DMAC_CHANNEL, CHANNEL_0);
392 dmac_write(host, DMAC_DEVCON0, INIT_DEVCON0);
393 dmac_write(host, DMAC_DEVCON1, INIT_DEVCON1);
394 #endif
395
396 host->SCpnt = NULL;
397 host->scsi.phase = PHASE_IDLE;
398 host->scsi.disconnectable = 0;
399
400 memset(host->busyluns, 0, sizeof(host->busyluns));
401
402 for (i = 0; i < 8; i++) {
403 host->device[i].sync_state = SYNC_NEGOCIATE;
404 host->device[i].disconnect_ok = 1;
405 }
406
407 /* wait 25 cs. SCSI standard says 250ms. */
408 acornscsi_csdelay(25);
409 }
410
411 /*=============================================================================================
412 * Utility routines (eg. debug)
413 */
414 #ifdef CONFIG_ACORNSCSI_CONSTANTS
415 static char *acornscsi_interrupttype[] = {
416 "rst", "suc", "p/a", "3",
417 "term", "5", "6", "7",
418 "serv", "9", "a", "b",
419 "c", "d", "e", "f"
420 };
421
422 static signed char acornscsi_map[] = {
423 0, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
424 -1, 2, -1, -1, -1, -1, 3, -1, 4, 5, 6, 7, 8, 9, 10, 11,
425 12, 13, 14, -1, -1, -1, -1, -1, 4, 5, 6, 7, 8, 9, 10, 11,
426 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
427 15, 16, 17, 18, 19, -1, -1, 20, 4, 5, 6, 7, 8, 9, 10, 11,
428 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
429 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
430 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
431 21, 22, -1, -1, -1, 23, -1, -1, 4, 5, 6, 7, 8, 9, 10, 11,
432 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
433 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
434 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
435 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
436 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
437 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
438 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
439 };
440
441 static char *acornscsi_interruptcode[] = {
442 /* 0 */
443 "reset - normal mode", /* 00 */
444 "reset - advanced mode", /* 01 */
445
446 /* 2 */
447 "sel", /* 11 */
448 "sel+xfer", /* 16 */
449 "data-out", /* 18 */
450 "data-in", /* 19 */
451 "cmd", /* 1A */
452 "stat", /* 1B */
453 "??-out", /* 1C */
454 "??-in", /* 1D */
455 "msg-out", /* 1E */
456 "msg-in", /* 1F */
457
458 /* 12 */
459 "/ACK asserted", /* 20 */
460 "save-data-ptr", /* 21 */
461 "{re}sel", /* 22 */
462
463 /* 15 */
464 "inv cmd", /* 40 */
465 "unexpected disconnect", /* 41 */
466 "sel timeout", /* 42 */
467 "P err", /* 43 */
468 "P err+ATN", /* 44 */
469 "bad status byte", /* 47 */
470
471 /* 21 */
472 "resel, no id", /* 80 */
473 "resel", /* 81 */
474 "discon", /* 85 */
475 };
476
477 static
478 void print_scsi_status(unsigned int ssr)
479 {
480 if (acornscsi_map[ssr] != -1)
481 printk("%s:%s",
482 acornscsi_interrupttype[(ssr >> 4)],
483 acornscsi_interruptcode[acornscsi_map[ssr]]);
484 else
485 printk("%X:%X", ssr >> 4, ssr & 0x0f);
486 }
487 #endif
488
489 static
490 void print_sbic_status(int asr, int ssr, int cmdphase)
491 {
492 #ifdef CONFIG_ACORNSCSI_CONSTANTS
493 printk("sbic: %c%c%c%c%c%c ",
494 asr & ASR_INT ? 'I' : 'i',
495 asr & ASR_LCI ? 'L' : 'l',
496 asr & ASR_BSY ? 'B' : 'b',
497 asr & ASR_CIP ? 'C' : 'c',
498 asr & ASR_PE ? 'P' : 'p',
499 asr & ASR_DBR ? 'D' : 'd');
500 printk("scsi: ");
501 print_scsi_status(ssr);
502 printk(" ph %02X\n", cmdphase);
503 #else
504 printk("sbic: %02X scsi: %X:%X ph: %02X\n",
505 asr, (ssr & 0xf0)>>4, ssr & 0x0f, cmdphase);
506 #endif
507 }
508
509 static void
510 acornscsi_dumplogline(AS_Host *host, int target, int line)
511 {
512 unsigned long prev;
513 signed int ptr;
514
515 ptr = host->status_ptr[target] - STATUS_BUFFER_TO_PRINT;
516 if (ptr < 0)
517 ptr += STATUS_BUFFER_SIZE;
518
519 printk("%c: %3s:", target == 8 ? 'H' : '0' + target,
520 line == 0 ? "ph" : line == 1 ? "ssr" : "int");
521
522 prev = host->status[target][ptr].when;
523
524 for (; ptr != host->status_ptr[target]; ptr = (ptr + 1) & (STATUS_BUFFER_SIZE - 1)) {
525 unsigned long time_diff;
526
527 if (!host->status[target][ptr].when)
528 continue;
529
530 switch (line) {
531 case 0:
532 printk("%c%02X", host->status[target][ptr].irq ? '-' : ' ',
533 host->status[target][ptr].ph);
534 break;
535
536 case 1:
537 printk(" %02X", host->status[target][ptr].ssr);
538 break;
539
540 case 2:
541 time_diff = host->status[target][ptr].when - prev;
542 prev = host->status[target][ptr].when;
543 if (time_diff == 0)
544 printk("==^");
545 else if (time_diff >= 100)
546 printk(" ");
547 else
548 printk(" %02ld", time_diff);
549 break;
550 }
551 }
552
553 printk("\n");
554 }
555
556 static
557 void acornscsi_dumplog(AS_Host *host, int target)
558 {
559 do {
560 acornscsi_dumplogline(host, target, 0);
561 acornscsi_dumplogline(host, target, 1);
562 acornscsi_dumplogline(host, target, 2);
563
564 if (target == 8)
565 break;
566
567 target = 8;
568 } while (1);
569 }
570
571 static
572 char acornscsi_target(AS_Host *host)
573 {
574 if (host->SCpnt)
575 return '0' + host->SCpnt->device->id;
576 return 'H';
577 }
578
579 /*
580 * Prototype: cmdtype_t acornscsi_cmdtype(int command)
581 * Purpose : differentiate READ from WRITE from other commands
582 * Params : command - command to interpret
583 * Returns : CMD_READ - command reads data,
584 * CMD_WRITE - command writes data,
585 * CMD_MISC - everything else
586 */
587 static inline
588 cmdtype_t acornscsi_cmdtype(int command)
589 {
590 switch (command) {
591 case WRITE_6: case WRITE_10: case WRITE_12:
592 return CMD_WRITE;
593 case READ_6: case READ_10: case READ_12:
594 return CMD_READ;
595 default:
596 return CMD_MISC;
597 }
598 }
599
600 /*
601 * Prototype: int acornscsi_datadirection(int command)
602 * Purpose : differentiate between commands that have a DATA IN phase
603 * and a DATA OUT phase
604 * Params : command - command to interpret
605 * Returns : DATADIR_OUT - data out phase expected
606 * DATADIR_IN - data in phase expected
607 */
608 static
609 datadir_t acornscsi_datadirection(int command)
610 {
611 switch (command) {
612 case CHANGE_DEFINITION: case COMPARE: case COPY:
613 case COPY_VERIFY: case LOG_SELECT: case MODE_SELECT:
614 case MODE_SELECT_10: case SEND_DIAGNOSTIC: case WRITE_BUFFER:
615 case FORMAT_UNIT: case REASSIGN_BLOCKS: case RESERVE:
616 case SEARCH_EQUAL: case SEARCH_HIGH: case SEARCH_LOW:
617 case WRITE_6: case WRITE_10: case WRITE_VERIFY:
618 case UPDATE_BLOCK: case WRITE_LONG: case WRITE_SAME:
619 case SEARCH_HIGH_12: case SEARCH_EQUAL_12: case SEARCH_LOW_12:
620 case WRITE_12: case WRITE_VERIFY_12: case SET_WINDOW:
621 case MEDIUM_SCAN: case SEND_VOLUME_TAG: case 0xea:
622 return DATADIR_OUT;
623 default:
624 return DATADIR_IN;
625 }
626 }
627
628 /*
629 * Purpose : provide values for synchronous transfers with 33C93.
630 * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting
631 * Modified by Russell King for 8MHz WD33C93A
632 */
633 static struct sync_xfer_tbl {
634 unsigned int period_ns;
635 unsigned char reg_value;
636 } sync_xfer_table[] = {
637 { 1, 0x20 }, { 249, 0x20 }, { 374, 0x30 },
638 { 499, 0x40 }, { 624, 0x50 }, { 749, 0x60 },
639 { 874, 0x70 }, { 999, 0x00 }, { 0, 0 }
640 };
641
642 /*
643 * Prototype: int acornscsi_getperiod(unsigned char syncxfer)
644 * Purpose : period for the synchronous transfer setting
645 * Params : syncxfer SYNCXFER register value
646 * Returns : period in ns.
647 */
648 static
649 int acornscsi_getperiod(unsigned char syncxfer)
650 {
651 int i;
652
653 syncxfer &= 0xf0;
654 if (syncxfer == 0x10)
655 syncxfer = 0;
656
657 for (i = 1; sync_xfer_table[i].period_ns; i++)
658 if (syncxfer == sync_xfer_table[i].reg_value)
659 return sync_xfer_table[i].period_ns;
660 return 0;
661 }
662
663 /*
664 * Prototype: int round_period(unsigned int period)
665 * Purpose : return index into above table for a required REQ period
666 * Params : period - time (ns) for REQ
667 * Returns : table index
668 * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting
669 */
670 static inline
671 int round_period(unsigned int period)
672 {
673 int i;
674
675 for (i = 1; sync_xfer_table[i].period_ns; i++) {
676 if ((period <= sync_xfer_table[i].period_ns) &&
677 (period > sync_xfer_table[i - 1].period_ns))
678 return i;
679 }
680 return 7;
681 }
682
683 /*
684 * Prototype: unsigned char calc_sync_xfer(unsigned int period, unsigned int offset)
685 * Purpose : calculate value for 33c93s SYNC register
686 * Params : period - time (ns) for REQ
687 * offset - offset in bytes between REQ/ACK
688 * Returns : value for SYNC register
689 * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting
690 */
691 static
692 unsigned char calc_sync_xfer(unsigned int period, unsigned int offset)
693 {
694 return sync_xfer_table[round_period(period)].reg_value |
695 ((offset < SDTR_SIZE) ? offset : SDTR_SIZE);
696 }
697
698 /* ====================================================================================
699 * Command functions
700 */
701 /*
702 * Function: acornscsi_kick(AS_Host *host)
703 * Purpose : kick next command to interface
704 * Params : host - host to send command to
705 * Returns : INTR_IDLE if idle, otherwise INTR_PROCESSING
706 * Notes : interrupts are always disabled!
707 */
708 static
709 intr_ret_t acornscsi_kick(AS_Host *host)
710 {
711 int from_queue = 0;
712 struct scsi_cmnd *SCpnt;
713
714 /* first check to see if a command is waiting to be executed */
715 SCpnt = host->origSCpnt;
716 host->origSCpnt = NULL;
717
718 /* retrieve next command */
719 if (!SCpnt) {
720 SCpnt = queue_remove_exclude(&host->queues.issue, host->busyluns);
721 if (!SCpnt)
722 return INTR_IDLE;
723
724 from_queue = 1;
725 }
726
727 if (host->scsi.disconnectable && host->SCpnt) {
728 queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt);
729 host->scsi.disconnectable = 0;
730 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
731 DBG(host->SCpnt, printk("scsi%d.%c: moved command to disconnected queue\n",
732 host->host->host_no, acornscsi_target(host)));
733 #endif
734 host->SCpnt = NULL;
735 }
736
737 /*
738 * If we have an interrupt pending, then we may have been reselected.
739 * In this case, we don't want to write to the registers
740 */
741 if (!(sbic_arm_read(host, SBIC_ASR) & (ASR_INT|ASR_BSY|ASR_CIP))) {
742 sbic_arm_write(host, SBIC_DESTID, SCpnt->device->id);
743 sbic_arm_write(host, SBIC_CMND, CMND_SELWITHATN);
744 }
745
746 /*
747 * claim host busy - all of these must happen atomically wrt
748 * our interrupt routine. Failure means command loss.
749 */
750 host->scsi.phase = PHASE_CONNECTING;
751 host->SCpnt = SCpnt;
752 host->scsi.SCp = SCpnt->SCp;
753 host->dma.xfer_setup = 0;
754 host->dma.xfer_required = 0;
755 host->dma.xfer_done = 0;
756
757 #if (DEBUG & (DEBUG_ABORT|DEBUG_CONNECT))
758 DBG(SCpnt,printk("scsi%d.%c: starting cmd %02X\n",
759 host->host->host_no, '0' + SCpnt->device->id,
760 SCpnt->cmnd[0]));
761 #endif
762
763 if (from_queue) {
764 #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
765 /*
766 * tagged queueing - allocate a new tag to this command
767 */
768 if (SCpnt->device->simple_tags) {
769 SCpnt->device->current_tag += 1;
770 if (SCpnt->device->current_tag == 0)
771 SCpnt->device->current_tag = 1;
772 SCpnt->tag = SCpnt->device->current_tag;
773 } else
774 #endif
775 set_bit(SCpnt->device->id * 8 + SCpnt->device->lun, host->busyluns);
776
777 host->stats.removes += 1;
778
779 switch (acornscsi_cmdtype(SCpnt->cmnd[0])) {
780 case CMD_WRITE:
781 host->stats.writes += 1;
782 break;
783 case CMD_READ:
784 host->stats.reads += 1;
785 break;
786 case CMD_MISC:
787 host->stats.miscs += 1;
788 break;
789 }
790 }
791
792 return INTR_PROCESSING;
793 }
794
795 /*
796 * Function: void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp, unsigned int result)
797 * Purpose : complete processing for command
798 * Params : host - interface that completed
799 * result - driver byte of result
800 */
801 static void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp,
802 unsigned int result)
803 {
804 struct scsi_cmnd *SCpnt = *SCpntp;
805
806 /* clean up */
807 sbic_arm_write(host, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP);
808
809 host->stats.fins += 1;
810
811 if (SCpnt) {
812 *SCpntp = NULL;
813
814 acornscsi_dma_cleanup(host);
815
816 SCpnt->result = result << 16 | host->scsi.SCp.Message << 8 | host->scsi.SCp.Status;
817
818 /*
819 * In theory, this should not happen. In practice, it seems to.
820 * Only trigger an error if the device attempts to report all happy
821 * but with untransferred buffers... If we don't do something, then
822 * data loss will occur. Should we check SCpnt->underflow here?
823 * It doesn't appear to be set to something meaningful by the higher
824 * levels all the time.
825 */
826 if (result == DID_OK) {
827 int xfer_warn = 0;
828
829 if (SCpnt->underflow == 0) {
830 if (host->scsi.SCp.ptr &&
831 acornscsi_cmdtype(SCpnt->cmnd[0]) != CMD_MISC)
832 xfer_warn = 1;
833 } else {
834 if (host->scsi.SCp.scsi_xferred < SCpnt->underflow ||
835 host->scsi.SCp.scsi_xferred != host->dma.transferred)
836 xfer_warn = 1;
837 }
838
839 /* ANSI standard says: (SCSI-2 Rev 10c Sect 5.6.6)
840 * Targets which break data transfers into multiple
841 * connections shall end each successful connection
842 * (except possibly the last) with a SAVE DATA
843 * POINTER - DISCONNECT message sequence.
844 *
845 * This makes it difficult to ensure that a transfer has
846 * completed. If we reach the end of a transfer during
847 * the command, then we can only have finished the transfer.
848 * therefore, if we seem to have some data remaining, this
849 * is not a problem.
850 */
851 if (host->dma.xfer_done)
852 xfer_warn = 0;
853
854 if (xfer_warn) {
855 switch (status_byte(SCpnt->result)) {
856 case CHECK_CONDITION:
857 case COMMAND_TERMINATED:
858 case BUSY:
859 case QUEUE_FULL:
860 case RESERVATION_CONFLICT:
861 break;
862
863 default:
864 printk(KERN_ERR "scsi%d.H: incomplete data transfer detected: result=%08X command=",
865 host->host->host_no, SCpnt->result);
866 __scsi_print_command(SCpnt->cmnd);
867 acornscsi_dumpdma(host, "done");
868 acornscsi_dumplog(host, SCpnt->device->id);
869 SCpnt->result &= 0xffff;
870 SCpnt->result |= DID_ERROR << 16;
871 }
872 }
873 }
874
875 if (!SCpnt->scsi_done)
876 panic("scsi%d.H: null scsi_done function in acornscsi_done", host->host->host_no);
877
878 clear_bit(SCpnt->device->id * 8 + SCpnt->device->lun, host->busyluns);
879
880 SCpnt->scsi_done(SCpnt);
881 } else
882 printk("scsi%d: null command in acornscsi_done", host->host->host_no);
883
884 host->scsi.phase = PHASE_IDLE;
885 }
886
887 /* ====================================================================================
888 * DMA routines
889 */
890 /*
891 * Purpose : update SCSI Data Pointer
892 * Notes : this will only be one SG entry or less
893 */
894 static
895 void acornscsi_data_updateptr(AS_Host *host, struct scsi_pointer *SCp, unsigned int length)
896 {
897 SCp->ptr += length;
898 SCp->this_residual -= length;
899
900 if (SCp->this_residual == 0 && next_SCp(SCp) == 0)
901 host->dma.xfer_done = 1;
902 }
903
904 /*
905 * Prototype: void acornscsi_data_read(AS_Host *host, char *ptr,
906 * unsigned int start_addr, unsigned int length)
907 * Purpose : read data from DMA RAM
908 * Params : host - host to transfer from
909 * ptr - DRAM address
910 * start_addr - host mem address
911 * length - number of bytes to transfer
912 * Notes : this will only be one SG entry or less
913 */
914 static
915 void acornscsi_data_read(AS_Host *host, char *ptr,
916 unsigned int start_addr, unsigned int length)
917 {
918 extern void __acornscsi_in(void __iomem *, char *buf, int len);
919 unsigned int page, offset, len = length;
920
921 page = (start_addr >> 12);
922 offset = start_addr & ((1 << 12) - 1);
923
924 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG);
925
926 while (len > 0) {
927 unsigned int this_len;
928
929 if (len + offset > (1 << 12))
930 this_len = (1 << 12) - offset;
931 else
932 this_len = len;
933
934 __acornscsi_in(host->base + (offset << 1), ptr, this_len);
935
936 offset += this_len;
937 ptr += this_len;
938 len -= this_len;
939
940 if (offset == (1 << 12)) {
941 offset = 0;
942 page ++;
943 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG);
944 }
945 }
946 writeb(host->card.page_reg, host->fast + PAGE_REG);
947 }
948
949 /*
950 * Prototype: void acornscsi_data_write(AS_Host *host, char *ptr,
951 * unsigned int start_addr, unsigned int length)
952 * Purpose : write data to DMA RAM
953 * Params : host - host to transfer from
954 * ptr - DRAM address
955 * start_addr - host mem address
956 * length - number of bytes to transfer
957 * Notes : this will only be one SG entry or less
958 */
959 static
960 void acornscsi_data_write(AS_Host *host, char *ptr,
961 unsigned int start_addr, unsigned int length)
962 {
963 extern void __acornscsi_out(void __iomem *, char *buf, int len);
964 unsigned int page, offset, len = length;
965
966 page = (start_addr >> 12);
967 offset = start_addr & ((1 << 12) - 1);
968
969 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG);
970
971 while (len > 0) {
972 unsigned int this_len;
973
974 if (len + offset > (1 << 12))
975 this_len = (1 << 12) - offset;
976 else
977 this_len = len;
978
979 __acornscsi_out(host->base + (offset << 1), ptr, this_len);
980
981 offset += this_len;
982 ptr += this_len;
983 len -= this_len;
984
985 if (offset == (1 << 12)) {
986 offset = 0;
987 page ++;
988 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG);
989 }
990 }
991 writeb(host->card.page_reg, host->fast + PAGE_REG);
992 }
993
994 /* =========================================================================================
995 * On-board DMA routines
996 */
997 #ifdef USE_DMAC
998 /*
999 * Prototype: void acornscsi_dmastop(AS_Host *host)
1000 * Purpose : stop all DMA
1001 * Params : host - host on which to stop DMA
1002 * Notes : This is called when leaving DATA IN/OUT phase,
1003 * or when interface is RESET
1004 */
1005 static inline
1006 void acornscsi_dma_stop(AS_Host *host)
1007 {
1008 dmac_write(host, DMAC_MASKREG, MASK_ON);
1009 dmac_clearintr(host);
1010
1011 #if (DEBUG & DEBUG_DMA)
1012 DBG(host->SCpnt, acornscsi_dumpdma(host, "stop"));
1013 #endif
1014 }
1015
1016 /*
1017 * Function: void acornscsi_dma_setup(AS_Host *host, dmadir_t direction)
1018 * Purpose : setup DMA controller for data transfer
1019 * Params : host - host to setup
1020 * direction - data transfer direction
1021 * Notes : This is called when entering DATA I/O phase, not
1022 * while we're in a DATA I/O phase
1023 */
1024 static
1025 void acornscsi_dma_setup(AS_Host *host, dmadir_t direction)
1026 {
1027 unsigned int address, length, mode;
1028
1029 host->dma.direction = direction;
1030
1031 dmac_write(host, DMAC_MASKREG, MASK_ON);
1032
1033 if (direction == DMA_OUT) {
1034 #if (DEBUG & DEBUG_NO_WRITE)
1035 if (NO_WRITE & (1 << host->SCpnt->device->id)) {
1036 printk(KERN_CRIT "scsi%d.%c: I can't handle DMA_OUT!\n",
1037 host->host->host_no, acornscsi_target(host));
1038 return;
1039 }
1040 #endif
1041 mode = DMAC_WRITE;
1042 } else
1043 mode = DMAC_READ;
1044
1045 /*
1046 * Allocate some buffer space, limited to half the buffer size
1047 */
1048 length = min_t(unsigned int, host->scsi.SCp.this_residual, DMAC_BUFFER_SIZE / 2);
1049 if (length) {
1050 host->dma.start_addr = address = host->dma.free_addr;
1051 host->dma.free_addr = (host->dma.free_addr + length) &
1052 (DMAC_BUFFER_SIZE - 1);
1053
1054 /*
1055 * Transfer data to DMA memory
1056 */
1057 if (direction == DMA_OUT)
1058 acornscsi_data_write(host, host->scsi.SCp.ptr, host->dma.start_addr,
1059 length);
1060
1061 length -= 1;
1062 dmac_write(host, DMAC_TXCNTLO, length);
1063 dmac_write(host, DMAC_TXCNTHI, length >> 8);
1064 dmac_write(host, DMAC_TXADRLO, address);
1065 dmac_write(host, DMAC_TXADRMD, address >> 8);
1066 dmac_write(host, DMAC_TXADRHI, 0);
1067 dmac_write(host, DMAC_MODECON, mode);
1068 dmac_write(host, DMAC_MASKREG, MASK_OFF);
1069
1070 #if (DEBUG & DEBUG_DMA)
1071 DBG(host->SCpnt, acornscsi_dumpdma(host, "strt"));
1072 #endif
1073 host->dma.xfer_setup = 1;
1074 }
1075 }
1076
1077 /*
1078 * Function: void acornscsi_dma_cleanup(AS_Host *host)
1079 * Purpose : ensure that all DMA transfers are up-to-date & host->scsi.SCp is correct
1080 * Params : host - host to finish
1081 * Notes : This is called when a command is:
1082 * terminating, RESTORE_POINTERS, SAVE_POINTERS, DISCONECT
1083 * : This must not return until all transfers are completed.
1084 */
1085 static
1086 void acornscsi_dma_cleanup(AS_Host *host)
1087 {
1088 dmac_write(host, DMAC_MASKREG, MASK_ON);
1089 dmac_clearintr(host);
1090
1091 /*
1092 * Check for a pending transfer
1093 */
1094 if (host->dma.xfer_required) {
1095 host->dma.xfer_required = 0;
1096 if (host->dma.direction == DMA_IN)
1097 acornscsi_data_read(host, host->dma.xfer_ptr,
1098 host->dma.xfer_start, host->dma.xfer_length);
1099 }
1100
1101 /*
1102 * Has a transfer been setup?
1103 */
1104 if (host->dma.xfer_setup) {
1105 unsigned int transferred;
1106
1107 host->dma.xfer_setup = 0;
1108
1109 #if (DEBUG & DEBUG_DMA)
1110 DBG(host->SCpnt, acornscsi_dumpdma(host, "cupi"));
1111 #endif
1112
1113 /*
1114 * Calculate number of bytes transferred from DMA.
1115 */
1116 transferred = dmac_address(host) - host->dma.start_addr;
1117 host->dma.transferred += transferred;
1118
1119 if (host->dma.direction == DMA_IN)
1120 acornscsi_data_read(host, host->scsi.SCp.ptr,
1121 host->dma.start_addr, transferred);
1122
1123 /*
1124 * Update SCSI pointers
1125 */
1126 acornscsi_data_updateptr(host, &host->scsi.SCp, transferred);
1127 #if (DEBUG & DEBUG_DMA)
1128 DBG(host->SCpnt, acornscsi_dumpdma(host, "cupo"));
1129 #endif
1130 }
1131 }
1132
1133 /*
1134 * Function: void acornscsi_dmacintr(AS_Host *host)
1135 * Purpose : handle interrupts from DMAC device
1136 * Params : host - host to process
1137 * Notes : If reading, we schedule the read to main memory &
1138 * allow the transfer to continue.
1139 * : If writing, we fill the onboard DMA memory from main
1140 * memory.
1141 * : Called whenever DMAC finished it's current transfer.
1142 */
1143 static
1144 void acornscsi_dma_intr(AS_Host *host)
1145 {
1146 unsigned int address, length, transferred;
1147
1148 #if (DEBUG & DEBUG_DMA)
1149 DBG(host->SCpnt, acornscsi_dumpdma(host, "inti"));
1150 #endif
1151
1152 dmac_write(host, DMAC_MASKREG, MASK_ON);
1153 dmac_clearintr(host);
1154
1155 /*
1156 * Calculate amount transferred via DMA
1157 */
1158 transferred = dmac_address(host) - host->dma.start_addr;
1159 host->dma.transferred += transferred;
1160
1161 /*
1162 * Schedule DMA transfer off board
1163 */
1164 if (host->dma.direction == DMA_IN) {
1165 host->dma.xfer_start = host->dma.start_addr;
1166 host->dma.xfer_length = transferred;
1167 host->dma.xfer_ptr = host->scsi.SCp.ptr;
1168 host->dma.xfer_required = 1;
1169 }
1170
1171 acornscsi_data_updateptr(host, &host->scsi.SCp, transferred);
1172
1173 /*
1174 * Allocate some buffer space, limited to half the on-board RAM size
1175 */
1176 length = min_t(unsigned int, host->scsi.SCp.this_residual, DMAC_BUFFER_SIZE / 2);
1177 if (length) {
1178 host->dma.start_addr = address = host->dma.free_addr;
1179 host->dma.free_addr = (host->dma.free_addr + length) &
1180 (DMAC_BUFFER_SIZE - 1);
1181
1182 /*
1183 * Transfer data to DMA memory
1184 */
1185 if (host->dma.direction == DMA_OUT)
1186 acornscsi_data_write(host, host->scsi.SCp.ptr, host->dma.start_addr,
1187 length);
1188
1189 length -= 1;
1190 dmac_write(host, DMAC_TXCNTLO, length);
1191 dmac_write(host, DMAC_TXCNTHI, length >> 8);
1192 dmac_write(host, DMAC_TXADRLO, address);
1193 dmac_write(host, DMAC_TXADRMD, address >> 8);
1194 dmac_write(host, DMAC_TXADRHI, 0);
1195 dmac_write(host, DMAC_MASKREG, MASK_OFF);
1196
1197 #if (DEBUG & DEBUG_DMA)
1198 DBG(host->SCpnt, acornscsi_dumpdma(host, "into"));
1199 #endif
1200 } else {
1201 host->dma.xfer_setup = 0;
1202 #if 0
1203 /*
1204 * If the interface still wants more, then this is an error.
1205 * We give it another byte, but we also attempt to raise an
1206 * attention condition. We continue giving one byte until
1207 * the device recognises the attention.
1208 */
1209 if (dmac_read(host, DMAC_STATUS) & STATUS_RQ0) {
1210 acornscsi_abortcmd(host, host->SCpnt->tag);
1211
1212 dmac_write(host, DMAC_TXCNTLO, 0);
1213 dmac_write(host, DMAC_TXCNTHI, 0);
1214 dmac_write(host, DMAC_TXADRLO, 0);
1215 dmac_write(host, DMAC_TXADRMD, 0);
1216 dmac_write(host, DMAC_TXADRHI, 0);
1217 dmac_write(host, DMAC_MASKREG, MASK_OFF);
1218 }
1219 #endif
1220 }
1221 }
1222
1223 /*
1224 * Function: void acornscsi_dma_xfer(AS_Host *host)
1225 * Purpose : transfer data between AcornSCSI and memory
1226 * Params : host - host to process
1227 */
1228 static
1229 void acornscsi_dma_xfer(AS_Host *host)
1230 {
1231 host->dma.xfer_required = 0;
1232
1233 if (host->dma.direction == DMA_IN)
1234 acornscsi_data_read(host, host->dma.xfer_ptr,
1235 host->dma.xfer_start, host->dma.xfer_length);
1236 }
1237
1238 /*
1239 * Function: void acornscsi_dma_adjust(AS_Host *host)
1240 * Purpose : adjust DMA pointers & count for bytes transferred to
1241 * SBIC but not SCSI bus.
1242 * Params : host - host to adjust DMA count for
1243 */
1244 static
1245 void acornscsi_dma_adjust(AS_Host *host)
1246 {
1247 if (host->dma.xfer_setup) {
1248 signed long transferred;
1249 #if (DEBUG & (DEBUG_DMA|DEBUG_WRITE))
1250 DBG(host->SCpnt, acornscsi_dumpdma(host, "adji"));
1251 #endif
1252 /*
1253 * Calculate correct DMA address - DMA is ahead of SCSI bus while
1254 * writing.
1255 * host->scsi.SCp.scsi_xferred is the number of bytes
1256 * actually transferred to/from the SCSI bus.
1257 * host->dma.transferred is the number of bytes transferred
1258 * over DMA since host->dma.start_addr was last set.
1259 *
1260 * real_dma_addr = host->dma.start_addr + host->scsi.SCp.scsi_xferred
1261 * - host->dma.transferred
1262 */
1263 transferred = host->scsi.SCp.scsi_xferred - host->dma.transferred;
1264 if (transferred < 0)
1265 printk("scsi%d.%c: Ack! DMA write correction %ld < 0!\n",
1266 host->host->host_no, acornscsi_target(host), transferred);
1267 else if (transferred == 0)
1268 host->dma.xfer_setup = 0;
1269 else {
1270 transferred += host->dma.start_addr;
1271 dmac_write(host, DMAC_TXADRLO, transferred);
1272 dmac_write(host, DMAC_TXADRMD, transferred >> 8);
1273 dmac_write(host, DMAC_TXADRHI, transferred >> 16);
1274 #if (DEBUG & (DEBUG_DMA|DEBUG_WRITE))
1275 DBG(host->SCpnt, acornscsi_dumpdma(host, "adjo"));
1276 #endif
1277 }
1278 }
1279 }
1280 #endif
1281
1282 /* =========================================================================================
1283 * Data I/O
1284 */
1285 static int
1286 acornscsi_write_pio(AS_Host *host, char *bytes, int *ptr, int len, unsigned int max_timeout)
1287 {
1288 unsigned int asr, timeout = max_timeout;
1289 int my_ptr = *ptr;
1290
1291 while (my_ptr < len) {
1292 asr = sbic_arm_read(host, SBIC_ASR);
1293
1294 if (asr & ASR_DBR) {
1295 timeout = max_timeout;
1296
1297 sbic_arm_write(host, SBIC_DATA, bytes[my_ptr++]);
1298 } else if (asr & ASR_INT)
1299 break;
1300 else if (--timeout == 0)
1301 break;
1302 udelay(1);
1303 }
1304
1305 *ptr = my_ptr;
1306
1307 return (timeout == 0) ? -1 : 0;
1308 }
1309
1310 /*
1311 * Function: void acornscsi_sendcommand(AS_Host *host)
1312 * Purpose : send a command to a target
1313 * Params : host - host which is connected to target
1314 */
1315 static void
1316 acornscsi_sendcommand(AS_Host *host)
1317 {
1318 struct scsi_cmnd *SCpnt = host->SCpnt;
1319
1320 sbic_arm_write(host, SBIC_TRANSCNTH, 0);
1321 sbic_arm_writenext(host, 0);
1322 sbic_arm_writenext(host, SCpnt->cmd_len - host->scsi.SCp.sent_command);
1323
1324 acornscsi_sbic_issuecmd(host, CMND_XFERINFO);
1325
1326 if (acornscsi_write_pio(host, SCpnt->cmnd,
1327 (int *)&host->scsi.SCp.sent_command, SCpnt->cmd_len, 1000000))
1328 printk("scsi%d: timeout while sending command\n", host->host->host_no);
1329
1330 host->scsi.phase = PHASE_COMMAND;
1331 }
1332
1333 static
1334 void acornscsi_sendmessage(AS_Host *host)
1335 {
1336 unsigned int message_length = msgqueue_msglength(&host->scsi.msgs);
1337 unsigned int msgnr;
1338 struct message *msg;
1339
1340 #if (DEBUG & DEBUG_MESSAGES)
1341 printk("scsi%d.%c: sending message ",
1342 host->host->host_no, acornscsi_target(host));
1343 #endif
1344
1345 switch (message_length) {
1346 case 0:
1347 acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT);
1348
1349 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "sending message 1");
1350
1351 sbic_arm_write(host, SBIC_DATA, NOP);
1352
1353 host->scsi.last_message = NOP;
1354 #if (DEBUG & DEBUG_MESSAGES)
1355 printk("NOP");
1356 #endif
1357 break;
1358
1359 case 1:
1360 acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT);
1361 msg = msgqueue_getmsg(&host->scsi.msgs, 0);
1362
1363 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "sending message 2");
1364
1365 sbic_arm_write(host, SBIC_DATA, msg->msg[0]);
1366
1367 host->scsi.last_message = msg->msg[0];
1368 #if (DEBUG & DEBUG_MESSAGES)
1369 spi_print_msg(msg->msg);
1370 #endif
1371 break;
1372
1373 default:
1374 /*
1375 * ANSI standard says: (SCSI-2 Rev 10c Sect 5.6.14)
1376 * 'When a target sends this (MESSAGE_REJECT) message, it
1377 * shall change to MESSAGE IN phase and send this message
1378 * prior to requesting additional message bytes from the
1379 * initiator. This provides an interlock so that the
1380 * initiator can determine which message byte is rejected.
1381 */
1382 sbic_arm_write(host, SBIC_TRANSCNTH, 0);
1383 sbic_arm_writenext(host, 0);
1384 sbic_arm_writenext(host, message_length);
1385 acornscsi_sbic_issuecmd(host, CMND_XFERINFO);
1386
1387 msgnr = 0;
1388 while ((msg = msgqueue_getmsg(&host->scsi.msgs, msgnr++)) != NULL) {
1389 unsigned int i;
1390 #if (DEBUG & DEBUG_MESSAGES)
1391 spi_print_msg(msg);
1392 #endif
1393 i = 0;
1394 if (acornscsi_write_pio(host, msg->msg, &i, msg->length, 1000000))
1395 printk("scsi%d: timeout while sending message\n", host->host->host_no);
1396
1397 host->scsi.last_message = msg->msg[0];
1398 if (msg->msg[0] == EXTENDED_MESSAGE)
1399 host->scsi.last_message |= msg->msg[2] << 8;
1400
1401 if (i != msg->length)
1402 break;
1403 }
1404 break;
1405 }
1406 #if (DEBUG & DEBUG_MESSAGES)
1407 printk("\n");
1408 #endif
1409 }
1410
1411 /*
1412 * Function: void acornscsi_readstatusbyte(AS_Host *host)
1413 * Purpose : Read status byte from connected target
1414 * Params : host - host connected to target
1415 */
1416 static
1417 void acornscsi_readstatusbyte(AS_Host *host)
1418 {
1419 acornscsi_sbic_issuecmd(host, CMND_XFERINFO|CMND_SBT);
1420 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "reading status byte");
1421 host->scsi.SCp.Status = sbic_arm_read(host, SBIC_DATA);
1422 }
1423
1424 /*
1425 * Function: unsigned char acornscsi_readmessagebyte(AS_Host *host)
1426 * Purpose : Read one message byte from connected target
1427 * Params : host - host connected to target
1428 */
1429 static
1430 unsigned char acornscsi_readmessagebyte(AS_Host *host)
1431 {
1432 unsigned char message;
1433
1434 acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT);
1435
1436 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "for message byte");
1437
1438 message = sbic_arm_read(host, SBIC_DATA);
1439
1440 /* wait for MSGIN-XFER-PAUSED */
1441 acornscsi_sbic_wait(host, ASR_INT, ASR_INT, 1000, "for interrupt after message byte");
1442
1443 sbic_arm_read(host, SBIC_SSR);
1444
1445 return message;
1446 }
1447
1448 /*
1449 * Function: void acornscsi_message(AS_Host *host)
1450 * Purpose : Read complete message from connected target & action message
1451 * Params : host - host connected to target
1452 */
1453 static
1454 void acornscsi_message(AS_Host *host)
1455 {
1456 unsigned char message[16];
1457 unsigned int msgidx = 0, msglen = 1;
1458
1459 do {
1460 message[msgidx] = acornscsi_readmessagebyte(host);
1461
1462 switch (msgidx) {
1463 case 0:
1464 if (message[0] == EXTENDED_MESSAGE ||
1465 (message[0] >= 0x20 && message[0] <= 0x2f))
1466 msglen = 2;
1467 break;
1468
1469 case 1:
1470 if (message[0] == EXTENDED_MESSAGE)
1471 msglen += message[msgidx];
1472 break;
1473 }
1474 msgidx += 1;
1475 if (msgidx < msglen) {
1476 acornscsi_sbic_issuecmd(host, CMND_NEGATEACK);
1477
1478 /* wait for next msg-in */
1479 acornscsi_sbic_wait(host, ASR_INT, ASR_INT, 1000, "for interrupt after negate ack");
1480 sbic_arm_read(host, SBIC_SSR);
1481 }
1482 } while (msgidx < msglen);
1483
1484 #if (DEBUG & DEBUG_MESSAGES)
1485 printk("scsi%d.%c: message in: ",
1486 host->host->host_no, acornscsi_target(host));
1487 spi_print_msg(message);
1488 printk("\n");
1489 #endif
1490
1491 if (host->scsi.phase == PHASE_RECONNECTED) {
1492 /*
1493 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.17)
1494 * 'Whenever a target reconnects to an initiator to continue
1495 * a tagged I/O process, the SIMPLE QUEUE TAG message shall
1496 * be sent immediately following the IDENTIFY message...'
1497 */
1498 if (message[0] == SIMPLE_QUEUE_TAG)
1499 host->scsi.reconnected.tag = message[1];
1500 if (acornscsi_reconnect_finish(host))
1501 host->scsi.phase = PHASE_MSGIN;
1502 }
1503
1504 switch (message[0]) {
1505 case ABORT:
1506 case ABORT_TAG:
1507 case COMMAND_COMPLETE:
1508 if (host->scsi.phase != PHASE_STATUSIN) {
1509 printk(KERN_ERR "scsi%d.%c: command complete following non-status in phase?\n",
1510 host->host->host_no, acornscsi_target(host));
1511 acornscsi_dumplog(host, host->SCpnt->device->id);
1512 }
1513 host->scsi.phase = PHASE_DONE;
1514 host->scsi.SCp.Message = message[0];
1515 break;
1516
1517 case SAVE_POINTERS:
1518 /*
1519 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.20)
1520 * 'The SAVE DATA POINTER message is sent from a target to
1521 * direct the initiator to copy the active data pointer to
1522 * the saved data pointer for the current I/O process.
1523 */
1524 acornscsi_dma_cleanup(host);
1525 host->SCpnt->SCp = host->scsi.SCp;
1526 host->SCpnt->SCp.sent_command = 0;
1527 host->scsi.phase = PHASE_MSGIN;
1528 break;
1529
1530 case RESTORE_POINTERS:
1531 /*
1532 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.19)
1533 * 'The RESTORE POINTERS message is sent from a target to
1534 * direct the initiator to copy the most recently saved
1535 * command, data, and status pointers for the I/O process
1536 * to the corresponding active pointers. The command and
1537 * status pointers shall be restored to the beginning of
1538 * the present command and status areas.'
1539 */
1540 acornscsi_dma_cleanup(host);
1541 host->scsi.SCp = host->SCpnt->SCp;
1542 host->scsi.phase = PHASE_MSGIN;
1543 break;
1544
1545 case DISCONNECT:
1546 /*
1547 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 6.4.2)
1548 * 'On those occasions when an error or exception condition occurs
1549 * and the target elects to repeat the information transfer, the
1550 * target may repeat the transfer either issuing a RESTORE POINTERS
1551 * message or by disconnecting without issuing a SAVE POINTERS
1552 * message. When reconnection is completed, the most recent
1553 * saved pointer values are restored.'
1554 */
1555 acornscsi_dma_cleanup(host);
1556 host->scsi.phase = PHASE_DISCONNECT;
1557 break;
1558
1559 case MESSAGE_REJECT:
1560 #if 0 /* this isn't needed any more */
1561 /*
1562 * If we were negociating sync transfer, we don't yet know if
1563 * this REJECT is for the sync transfer or for the tagged queue/wide
1564 * transfer. Re-initiate sync transfer negotiation now, and if
1565 * we got a REJECT in response to SDTR, then it'll be set to DONE.
1566 */
1567 if (host->device[host->SCpnt->device->id].sync_state == SYNC_SENT_REQUEST)
1568 host->device[host->SCpnt->device->id].sync_state = SYNC_NEGOCIATE;
1569 #endif
1570
1571 /*
1572 * If we have any messages waiting to go out, then assert ATN now
1573 */
1574 if (msgqueue_msglength(&host->scsi.msgs))
1575 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN);
1576
1577 switch (host->scsi.last_message) {
1578 #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
1579 case HEAD_OF_QUEUE_TAG:
1580 case ORDERED_QUEUE_TAG:
1581 case SIMPLE_QUEUE_TAG:
1582 /*
1583 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.17)
1584 * If a target does not implement tagged queuing and a queue tag
1585 * message is received, it shall respond with a MESSAGE REJECT
1586 * message and accept the I/O process as if it were untagged.
1587 */
1588 printk(KERN_NOTICE "scsi%d.%c: disabling tagged queueing\n",
1589 host->host->host_no, acornscsi_target(host));
1590 host->SCpnt->device->simple_tags = 0;
1591 set_bit(host->SCpnt->device->id * 8 + host->SCpnt->device->lun, host->busyluns);
1592 break;
1593 #endif
1594 case EXTENDED_MESSAGE | (EXTENDED_SDTR << 8):
1595 /*
1596 * Target can't handle synchronous transfers
1597 */
1598 printk(KERN_NOTICE "scsi%d.%c: Using asynchronous transfer\n",
1599 host->host->host_no, acornscsi_target(host));
1600 host->device[host->SCpnt->device->id].sync_xfer = SYNCHTRANSFER_2DBA;
1601 host->device[host->SCpnt->device->id].sync_state = SYNC_ASYNCHRONOUS;
1602 sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer);
1603 break;
1604
1605 default:
1606 break;
1607 }
1608 break;
1609
1610 case QUEUE_FULL:
1611 /* TODO: target queue is full */
1612 break;
1613
1614 case SIMPLE_QUEUE_TAG:
1615 /* tag queue reconnect... message[1] = queue tag. Print something to indicate something happened! */
1616 printk("scsi%d.%c: reconnect queue tag %02X\n",
1617 host->host->host_no, acornscsi_target(host),
1618 message[1]);
1619 break;
1620
1621 case EXTENDED_MESSAGE:
1622 switch (message[2]) {
1623 #ifdef CONFIG_SCSI_ACORNSCSI_SYNC
1624 case EXTENDED_SDTR:
1625 if (host->device[host->SCpnt->device->id].sync_state == SYNC_SENT_REQUEST) {
1626 /*
1627 * We requested synchronous transfers. This isn't quite right...
1628 * We can only say if this succeeded if we proceed on to execute the
1629 * command from this message. If we get a MESSAGE PARITY ERROR,
1630 * and the target retries fail, then we fallback to asynchronous mode
1631 */
1632 host->device[host->SCpnt->device->id].sync_state = SYNC_COMPLETED;
1633 printk(KERN_NOTICE "scsi%d.%c: Using synchronous transfer, offset %d, %d ns\n",
1634 host->host->host_no, acornscsi_target(host),
1635 message[4], message[3] * 4);
1636 host->device[host->SCpnt->device->id].sync_xfer =
1637 calc_sync_xfer(message[3] * 4, message[4]);
1638 } else {
1639 unsigned char period, length;
1640 /*
1641 * Target requested synchronous transfers. The agreement is only
1642 * to be in operation AFTER the target leaves message out phase.
1643 */
1644 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN);
1645 period = max_t(unsigned int, message[3], sdtr_period / 4);
1646 length = min_t(unsigned int, message[4], sdtr_size);
1647 msgqueue_addmsg(&host->scsi.msgs, 5, EXTENDED_MESSAGE, 3,
1648 EXTENDED_SDTR, period, length);
1649 host->device[host->SCpnt->device->id].sync_xfer =
1650 calc_sync_xfer(period * 4, length);
1651 }
1652 sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer);
1653 break;
1654 #else
1655 /* We do not accept synchronous transfers. Respond with a
1656 * MESSAGE_REJECT.
1657 */
1658 #endif
1659
1660 case EXTENDED_WDTR:
1661 /* The WD33C93A is only 8-bit. We respond with a MESSAGE_REJECT
1662 * to a wide data transfer request.
1663 */
1664 default:
1665 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN);
1666 msgqueue_flush(&host->scsi.msgs);
1667 msgqueue_addmsg(&host->scsi.msgs, 1, MESSAGE_REJECT);
1668 break;
1669 }
1670 break;
1671
1672 #ifdef CONFIG_SCSI_ACORNSCSI_LINK
1673 case LINKED_CMD_COMPLETE:
1674 case LINKED_FLG_CMD_COMPLETE:
1675 /*
1676 * We don't support linked commands yet
1677 */
1678 if (0) {
1679 #if (DEBUG & DEBUG_LINK)
1680 printk("scsi%d.%c: lun %d tag %d linked command complete\n",
1681 host->host->host_no, acornscsi_target(host), host->SCpnt->tag);
1682 #endif
1683 /*
1684 * A linked command should only terminate with one of these messages
1685 * if there are more linked commands available.
1686 */
1687 if (!host->SCpnt->next_link) {
1688 printk(KERN_WARNING "scsi%d.%c: lun %d tag %d linked command complete, but no next_link\n",
1689 instance->host_no, acornscsi_target(host), host->SCpnt->tag);
1690 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN);
1691 msgqueue_addmsg(&host->scsi.msgs, 1, ABORT);
1692 } else {
1693 struct scsi_cmnd *SCpnt = host->SCpnt;
1694
1695 acornscsi_dma_cleanup(host);
1696
1697 host->SCpnt = host->SCpnt->next_link;
1698 host->SCpnt->tag = SCpnt->tag;
1699 SCpnt->result = DID_OK | host->scsi.SCp.Message << 8 | host->Scsi.SCp.Status;
1700 SCpnt->done(SCpnt);
1701
1702 /* initialise host->SCpnt->SCp */
1703 }
1704 break;
1705 }
1706 #endif
1707
1708 default: /* reject message */
1709 printk(KERN_ERR "scsi%d.%c: unrecognised message %02X, rejecting\n",
1710 host->host->host_no, acornscsi_target(host),
1711 message[0]);
1712 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN);
1713 msgqueue_flush(&host->scsi.msgs);
1714 msgqueue_addmsg(&host->scsi.msgs, 1, MESSAGE_REJECT);
1715 host->scsi.phase = PHASE_MSGIN;
1716 break;
1717 }
1718 acornscsi_sbic_issuecmd(host, CMND_NEGATEACK);
1719 }
1720
1721 /*
1722 * Function: int acornscsi_buildmessages(AS_Host *host)
1723 * Purpose : build the connection messages for a host
1724 * Params : host - host to add messages to
1725 */
1726 static
1727 void acornscsi_buildmessages(AS_Host *host)
1728 {
1729 #if 0
1730 /* does the device need resetting? */
1731 if (cmd_reset) {
1732 msgqueue_addmsg(&host->scsi.msgs, 1, BUS_DEVICE_RESET);
1733 return;
1734 }
1735 #endif
1736
1737 msgqueue_addmsg(&host->scsi.msgs, 1,
1738 IDENTIFY(host->device[host->SCpnt->device->id].disconnect_ok,
1739 host->SCpnt->device->lun));
1740
1741 #if 0
1742 /* does the device need the current command aborted */
1743 if (cmd_aborted) {
1744 acornscsi_abortcmd(host->SCpnt->tag);
1745 return;
1746 }
1747 #endif
1748
1749 #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
1750 if (host->SCpnt->tag) {
1751 unsigned int tag_type;
1752
1753 if (host->SCpnt->cmnd[0] == REQUEST_SENSE ||
1754 host->SCpnt->cmnd[0] == TEST_UNIT_READY ||
1755 host->SCpnt->cmnd[0] == INQUIRY)
1756 tag_type = HEAD_OF_QUEUE_TAG;
1757 else
1758 tag_type = SIMPLE_QUEUE_TAG;
1759 msgqueue_addmsg(&host->scsi.msgs, 2, tag_type, host->SCpnt->tag);
1760 }
1761 #endif
1762
1763 #ifdef CONFIG_SCSI_ACORNSCSI_SYNC
1764 if (host->device[host->SCpnt->device->id].sync_state == SYNC_NEGOCIATE) {
1765 host->device[host->SCpnt->device->id].sync_state = SYNC_SENT_REQUEST;
1766 msgqueue_addmsg(&host->scsi.msgs, 5,
1767 EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
1768 sdtr_period / 4, sdtr_size);
1769 }
1770 #endif
1771 }
1772
1773 /*
1774 * Function: int acornscsi_starttransfer(AS_Host *host)
1775 * Purpose : transfer data to/from connected target
1776 * Params : host - host to which target is connected
1777 * Returns : 0 if failure
1778 */
1779 static
1780 int acornscsi_starttransfer(AS_Host *host)
1781 {
1782 int residual;
1783
1784 if (!host->scsi.SCp.ptr /*&& host->scsi.SCp.this_residual*/) {
1785 printk(KERN_ERR "scsi%d.%c: null buffer passed to acornscsi_starttransfer\n",
1786 host->host->host_no, acornscsi_target(host));
1787 return 0;
1788 }
1789
1790 residual = scsi_bufflen(host->SCpnt) - host->scsi.SCp.scsi_xferred;
1791
1792 sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer);
1793 sbic_arm_writenext(host, residual >> 16);
1794 sbic_arm_writenext(host, residual >> 8);
1795 sbic_arm_writenext(host, residual);
1796 acornscsi_sbic_issuecmd(host, CMND_XFERINFO);
1797 return 1;
1798 }
1799
1800 /* =========================================================================================
1801 * Connection & Disconnection
1802 */
1803 /*
1804 * Function : acornscsi_reconnect(AS_Host *host)
1805 * Purpose : reconnect a previously disconnected command
1806 * Params : host - host specific data
1807 * Remarks : SCSI spec says:
1808 * 'The set of active pointers is restored from the set
1809 * of saved pointers upon reconnection of the I/O process'
1810 */
1811 static
1812 int acornscsi_reconnect(AS_Host *host)
1813 {
1814 unsigned int target, lun, ok = 0;
1815
1816 target = sbic_arm_read(host, SBIC_SOURCEID);
1817
1818 if (!(target & 8))
1819 printk(KERN_ERR "scsi%d: invalid source id after reselection "
1820 "- device fault?\n",
1821 host->host->host_no);
1822
1823 target &= 7;
1824
1825 if (host->SCpnt && !host->scsi.disconnectable) {
1826 printk(KERN_ERR "scsi%d.%d: reconnected while command in "
1827 "progress to target %d?\n",
1828 host->host->host_no, target, host->SCpnt->device->id);
1829 host->SCpnt = NULL;
1830 }
1831
1832 lun = sbic_arm_read(host, SBIC_DATA) & 7;
1833
1834 host->scsi.reconnected.target = target;
1835 host->scsi.reconnected.lun = lun;
1836 host->scsi.reconnected.tag = 0;
1837
1838 if (host->scsi.disconnectable && host->SCpnt &&
1839 host->SCpnt->device->id == target && host->SCpnt->device->lun == lun)
1840 ok = 1;
1841
1842 if (!ok && queue_probetgtlun(&host->queues.disconnected, target, lun))
1843 ok = 1;
1844
1845 ADD_STATUS(target, 0x81, host->scsi.phase, 0);
1846
1847 if (ok) {
1848 host->scsi.phase = PHASE_RECONNECTED;
1849 } else {
1850 /* this doesn't seem to work */
1851 printk(KERN_ERR "scsi%d.%c: reselected with no command "
1852 "to reconnect with\n",
1853 host->host->host_no, '0' + target);
1854 acornscsi_dumplog(host, target);
1855 acornscsi_abortcmd(host, 0);
1856 if (host->SCpnt) {
1857 queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt);
1858 host->SCpnt = NULL;
1859 }
1860 }
1861 acornscsi_sbic_issuecmd(host, CMND_NEGATEACK);
1862 return !ok;
1863 }
1864
1865 /*
1866 * Function: int acornscsi_reconect_finish(AS_Host *host)
1867 * Purpose : finish reconnecting a command
1868 * Params : host - host to complete
1869 * Returns : 0 if failed
1870 */
1871 static
1872 int acornscsi_reconnect_finish(AS_Host *host)
1873 {
1874 if (host->scsi.disconnectable && host->SCpnt) {
1875 host->scsi.disconnectable = 0;
1876 if (host->SCpnt->device->id == host->scsi.reconnected.target &&
1877 host->SCpnt->device->lun == host->scsi.reconnected.lun &&
1878 host->SCpnt->tag == host->scsi.reconnected.tag) {
1879 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
1880 DBG(host->SCpnt, printk("scsi%d.%c: reconnected",
1881 host->host->host_no, acornscsi_target(host)));
1882 #endif
1883 } else {
1884 queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt);
1885 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
1886 DBG(host->SCpnt, printk("scsi%d.%c: had to move command "
1887 "to disconnected queue\n",
1888 host->host->host_no, acornscsi_target(host)));
1889 #endif
1890 host->SCpnt = NULL;
1891 }
1892 }
1893 if (!host->SCpnt) {
1894 host->SCpnt = queue_remove_tgtluntag(&host->queues.disconnected,
1895 host->scsi.reconnected.target,
1896 host->scsi.reconnected.lun,
1897 host->scsi.reconnected.tag);
1898 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
1899 DBG(host->SCpnt, printk("scsi%d.%c: had to get command",
1900 host->host->host_no, acornscsi_target(host)));
1901 #endif
1902 }
1903
1904 if (!host->SCpnt)
1905 acornscsi_abortcmd(host, host->scsi.reconnected.tag);
1906 else {
1907 /*
1908 * Restore data pointer from SAVED pointers.
1909 */
1910 host->scsi.SCp = host->SCpnt->SCp;
1911 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
1912 printk(", data pointers: [%p, %X]",
1913 host->scsi.SCp.ptr, host->scsi.SCp.this_residual);
1914 #endif
1915 }
1916 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
1917 printk("\n");
1918 #endif
1919
1920 host->dma.transferred = host->scsi.SCp.scsi_xferred;
1921
1922 return host->SCpnt != NULL;
1923 }
1924
1925 /*
1926 * Function: void acornscsi_disconnect_unexpected(AS_Host *host)
1927 * Purpose : handle an unexpected disconnect
1928 * Params : host - host on which disconnect occurred
1929 */
1930 static
1931 void acornscsi_disconnect_unexpected(AS_Host *host)
1932 {
1933 printk(KERN_ERR "scsi%d.%c: unexpected disconnect\n",
1934 host->host->host_no, acornscsi_target(host));
1935 #if (DEBUG & DEBUG_ABORT)
1936 acornscsi_dumplog(host, 8);
1937 #endif
1938
1939 acornscsi_done(host, &host->SCpnt, DID_ERROR);
1940 }
1941
1942 /*
1943 * Function: void acornscsi_abortcmd(AS_host *host, unsigned char tag)
1944 * Purpose : abort a currently executing command
1945 * Params : host - host with connected command to abort
1946 * tag - tag to abort
1947 */
1948 static
1949 void acornscsi_abortcmd(AS_Host *host, unsigned char tag)
1950 {
1951 host->scsi.phase = PHASE_ABORTED;
1952 sbic_arm_write(host, SBIC_CMND, CMND_ASSERTATN);
1953
1954 msgqueue_flush(&host->scsi.msgs);
1955 #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
1956 if (tag)
1957 msgqueue_addmsg(&host->scsi.msgs, 2, ABORT_TAG, tag);
1958 else
1959 #endif
1960 msgqueue_addmsg(&host->scsi.msgs, 1, ABORT);
1961 }
1962
1963 /* ==========================================================================================
1964 * Interrupt routines.
1965 */
1966 /*
1967 * Function: int acornscsi_sbicintr(AS_Host *host)
1968 * Purpose : handle interrupts from SCSI device
1969 * Params : host - host to process
1970 * Returns : INTR_PROCESS if expecting another SBIC interrupt
1971 * INTR_IDLE if no interrupt
1972 * INTR_NEXT_COMMAND if we have finished processing the command
1973 */
1974 static
1975 intr_ret_t acornscsi_sbicintr(AS_Host *host, int in_irq)
1976 {
1977 unsigned int asr, ssr;
1978
1979 asr = sbic_arm_read(host, SBIC_ASR);
1980 if (!(asr & ASR_INT))
1981 return INTR_IDLE;
1982
1983 ssr = sbic_arm_read(host, SBIC_SSR);
1984
1985 #if (DEBUG & DEBUG_PHASES)
1986 print_sbic_status(asr, ssr, host->scsi.phase);
1987 #endif
1988
1989 ADD_STATUS(8, ssr, host->scsi.phase, in_irq);
1990
1991 if (host->SCpnt && !host->scsi.disconnectable)
1992 ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, in_irq);
1993
1994 switch (ssr) {
1995 case 0x00: /* reset state - not advanced */
1996 printk(KERN_ERR "scsi%d: reset in standard mode but wanted advanced mode.\n",
1997 host->host->host_no);
1998 /* setup sbic - WD33C93A */
1999 sbic_arm_write(host, SBIC_OWNID, OWNID_EAF | host->host->this_id);
2000 sbic_arm_write(host, SBIC_CMND, CMND_RESET);
2001 return INTR_IDLE;
2002
2003 case 0x01: /* reset state - advanced */
2004 sbic_arm_write(host, SBIC_CTRL, INIT_SBICDMA | CTRL_IDI);
2005 sbic_arm_write(host, SBIC_TIMEOUT, TIMEOUT_TIME);
2006 sbic_arm_write(host, SBIC_SYNCHTRANSFER, SYNCHTRANSFER_2DBA);
2007 sbic_arm_write(host, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP);
2008 msgqueue_flush(&host->scsi.msgs);
2009 return INTR_IDLE;
2010
2011 case 0x41: /* unexpected disconnect aborted command */
2012 acornscsi_disconnect_unexpected(host);
2013 return INTR_NEXT_COMMAND;
2014 }
2015
2016 switch (host->scsi.phase) {
2017 case PHASE_CONNECTING: /* STATE: command removed from issue queue */
2018 switch (ssr) {
2019 case 0x11: /* -> PHASE_CONNECTED */
2020 /* BUS FREE -> SELECTION */
2021 host->scsi.phase = PHASE_CONNECTED;
2022 msgqueue_flush(&host->scsi.msgs);
2023 host->dma.transferred = host->scsi.SCp.scsi_xferred;
2024 /* 33C93 gives next interrupt indicating bus phase */
2025 asr = sbic_arm_read(host, SBIC_ASR);
2026 if (!(asr & ASR_INT))
2027 break;
2028 ssr = sbic_arm_read(host, SBIC_SSR);
2029 ADD_STATUS(8, ssr, host->scsi.phase, 1);
2030 ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, 1);
2031 goto connected;
2032
2033 case 0x42: /* select timed out */
2034 /* -> PHASE_IDLE */
2035 acornscsi_done(host, &host->SCpnt, DID_NO_CONNECT);
2036 return INTR_NEXT_COMMAND;
2037
2038 case 0x81: /* -> PHASE_RECONNECTED or PHASE_ABORTED */
2039 /* BUS FREE -> RESELECTION */
2040 host->origSCpnt = host->SCpnt;
2041 host->SCpnt = NULL;
2042 msgqueue_flush(&host->scsi.msgs);
2043 acornscsi_reconnect(host);
2044 break;
2045
2046 default:
2047 printk(KERN_ERR "scsi%d.%c: PHASE_CONNECTING, SSR %02X?\n",
2048 host->host->host_no, acornscsi_target(host), ssr);
2049 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2050 acornscsi_abortcmd(host, host->SCpnt->tag);
2051 }
2052 return INTR_PROCESSING;
2053
2054 connected:
2055 case PHASE_CONNECTED: /* STATE: device selected ok */
2056 switch (ssr) {
2057 #ifdef NONSTANDARD
2058 case 0x8a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */
2059 /* SELECTION -> COMMAND */
2060 acornscsi_sendcommand(host);
2061 break;
2062
2063 case 0x8b: /* -> PHASE_STATUS */
2064 /* SELECTION -> STATUS */
2065 acornscsi_readstatusbyte(host);
2066 host->scsi.phase = PHASE_STATUSIN;
2067 break;
2068 #endif
2069
2070 case 0x8e: /* -> PHASE_MSGOUT */
2071 /* SELECTION ->MESSAGE OUT */
2072 host->scsi.phase = PHASE_MSGOUT;
2073 acornscsi_buildmessages(host);
2074 acornscsi_sendmessage(host);
2075 break;
2076
2077 /* these should not happen */
2078 case 0x85: /* target disconnected */
2079 acornscsi_done(host, &host->SCpnt, DID_ERROR);
2080 break;
2081
2082 default:
2083 printk(KERN_ERR "scsi%d.%c: PHASE_CONNECTED, SSR %02X?\n",
2084 host->host->host_no, acornscsi_target(host), ssr);
2085 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2086 acornscsi_abortcmd(host, host->SCpnt->tag);
2087 }
2088 return INTR_PROCESSING;
2089
2090 case PHASE_MSGOUT: /* STATE: connected & sent IDENTIFY message */
2091 /*
2092 * SCSI standard says that MESSAGE OUT phases can be followed by a
2093 * DATA phase, STATUS phase, MESSAGE IN phase or COMMAND phase
2094 */
2095 switch (ssr) {
2096 case 0x8a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */
2097 case 0x1a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */
2098 /* MESSAGE OUT -> COMMAND */
2099 acornscsi_sendcommand(host);
2100 break;
2101
2102 case 0x8b: /* -> PHASE_STATUS */
2103 case 0x1b: /* -> PHASE_STATUS */
2104 /* MESSAGE OUT -> STATUS */
2105 acornscsi_readstatusbyte(host);
2106 host->scsi.phase = PHASE_STATUSIN;
2107 break;
2108
2109 case 0x8e: /* -> PHASE_MSGOUT */
2110 /* MESSAGE_OUT(MESSAGE_IN) ->MESSAGE OUT */
2111 acornscsi_sendmessage(host);
2112 break;
2113
2114 case 0x4f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */
2115 case 0x1f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */
2116 /* MESSAGE OUT -> MESSAGE IN */
2117 acornscsi_message(host);
2118 break;
2119
2120 default:
2121 printk(KERN_ERR "scsi%d.%c: PHASE_MSGOUT, 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_COMMAND: /* STATE: connected & command sent */
2128 switch (ssr) {
2129 case 0x18: /* -> PHASE_DATAOUT */
2130 /* COMMAND -> DATA OUT */
2131 if (host->scsi.SCp.sent_command != host->SCpnt->cmd_len)
2132 acornscsi_abortcmd(host, host->SCpnt->tag);
2133 acornscsi_dma_setup(host, DMA_OUT);
2134 if (!acornscsi_starttransfer(host))
2135 acornscsi_abortcmd(host, host->SCpnt->tag);
2136 host->scsi.phase = PHASE_DATAOUT;
2137 return INTR_IDLE;
2138
2139 case 0x19: /* -> PHASE_DATAIN */
2140 /* COMMAND -> DATA IN */
2141 if (host->scsi.SCp.sent_command != host->SCpnt->cmd_len)
2142 acornscsi_abortcmd(host, host->SCpnt->tag);
2143 acornscsi_dma_setup(host, DMA_IN);
2144 if (!acornscsi_starttransfer(host))
2145 acornscsi_abortcmd(host, host->SCpnt->tag);
2146 host->scsi.phase = PHASE_DATAIN;
2147 return INTR_IDLE;
2148
2149 case 0x1b: /* -> PHASE_STATUS */
2150 /* COMMAND -> STATUS */
2151 acornscsi_readstatusbyte(host);
2152 host->scsi.phase = PHASE_STATUSIN;
2153 break;
2154
2155 case 0x1e: /* -> PHASE_MSGOUT */
2156 /* COMMAND -> MESSAGE OUT */
2157 acornscsi_sendmessage(host);
2158 break;
2159
2160 case 0x1f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */
2161 /* COMMAND -> MESSAGE IN */
2162 acornscsi_message(host);
2163 break;
2164
2165 default:
2166 printk(KERN_ERR "scsi%d.%c: PHASE_COMMAND, SSR %02X?\n",
2167 host->host->host_no, acornscsi_target(host), ssr);
2168 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2169 }
2170 return INTR_PROCESSING;
2171
2172 case PHASE_DISCONNECT: /* STATE: connected, received DISCONNECT msg */
2173 if (ssr == 0x85) { /* -> PHASE_IDLE */
2174 host->scsi.disconnectable = 1;
2175 host->scsi.reconnected.tag = 0;
2176 host->scsi.phase = PHASE_IDLE;
2177 host->stats.disconnects += 1;
2178 } else {
2179 printk(KERN_ERR "scsi%d.%c: PHASE_DISCONNECT, SSR %02X instead of disconnect?\n",
2180 host->host->host_no, acornscsi_target(host), ssr);
2181 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2182 }
2183 return INTR_NEXT_COMMAND;
2184
2185 case PHASE_IDLE: /* STATE: disconnected */
2186 if (ssr == 0x81) /* -> PHASE_RECONNECTED or PHASE_ABORTED */
2187 acornscsi_reconnect(host);
2188 else {
2189 printk(KERN_ERR "scsi%d.%c: PHASE_IDLE, SSR %02X while idle?\n",
2190 host->host->host_no, acornscsi_target(host), ssr);
2191 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2192 }
2193 return INTR_PROCESSING;
2194
2195 case PHASE_RECONNECTED: /* STATE: device reconnected to initiator */
2196 /*
2197 * Command reconnected - if MESGIN, get message - it may be
2198 * the tag. If not, get command out of disconnected queue
2199 */
2200 /*
2201 * If we reconnected and we're not in MESSAGE IN phase after IDENTIFY,
2202 * reconnect I_T_L command
2203 */
2204 if (ssr != 0x8f && !acornscsi_reconnect_finish(host))
2205 return INTR_IDLE;
2206 ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, in_irq);
2207 switch (ssr) {
2208 case 0x88: /* data out phase */
2209 /* -> PHASE_DATAOUT */
2210 /* MESSAGE IN -> DATA OUT */
2211 acornscsi_dma_setup(host, DMA_OUT);
2212 if (!acornscsi_starttransfer(host))
2213 acornscsi_abortcmd(host, host->SCpnt->tag);
2214 host->scsi.phase = PHASE_DATAOUT;
2215 return INTR_IDLE;
2216
2217 case 0x89: /* data in phase */
2218 /* -> PHASE_DATAIN */
2219 /* MESSAGE IN -> DATA IN */
2220 acornscsi_dma_setup(host, DMA_IN);
2221 if (!acornscsi_starttransfer(host))
2222 acornscsi_abortcmd(host, host->SCpnt->tag);
2223 host->scsi.phase = PHASE_DATAIN;
2224 return INTR_IDLE;
2225
2226 case 0x8a: /* command out */
2227 /* MESSAGE IN -> COMMAND */
2228 acornscsi_sendcommand(host);/* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */
2229 break;
2230
2231 case 0x8b: /* status in */
2232 /* -> PHASE_STATUSIN */
2233 /* MESSAGE IN -> STATUS */
2234 acornscsi_readstatusbyte(host);
2235 host->scsi.phase = PHASE_STATUSIN;
2236 break;
2237
2238 case 0x8e: /* message out */
2239 /* -> PHASE_MSGOUT */
2240 /* MESSAGE IN -> MESSAGE OUT */
2241 acornscsi_sendmessage(host);
2242 break;
2243
2244 case 0x8f: /* message in */
2245 acornscsi_message(host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */
2246 break;
2247
2248 default:
2249 printk(KERN_ERR "scsi%d.%c: PHASE_RECONNECTED, SSR %02X after reconnect?\n",
2250 host->host->host_no, acornscsi_target(host), ssr);
2251 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2252 }
2253 return INTR_PROCESSING;
2254
2255 case PHASE_DATAIN: /* STATE: transferred data in */
2256 /*
2257 * This is simple - if we disconnect then the DMA address & count is
2258 * correct.
2259 */
2260 switch (ssr) {
2261 case 0x19: /* -> PHASE_DATAIN */
2262 case 0x89: /* -> PHASE_DATAIN */
2263 acornscsi_abortcmd(host, host->SCpnt->tag);
2264 return INTR_IDLE;
2265
2266 case 0x1b: /* -> PHASE_STATUSIN */
2267 case 0x4b: /* -> PHASE_STATUSIN */
2268 case 0x8b: /* -> PHASE_STATUSIN */
2269 /* DATA IN -> STATUS */
2270 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
2271 acornscsi_sbic_xfcount(host);
2272 acornscsi_dma_stop(host);
2273 acornscsi_readstatusbyte(host);
2274 host->scsi.phase = PHASE_STATUSIN;
2275 break;
2276
2277 case 0x1e: /* -> PHASE_MSGOUT */
2278 case 0x4e: /* -> PHASE_MSGOUT */
2279 case 0x8e: /* -> PHASE_MSGOUT */
2280 /* DATA IN -> MESSAGE OUT */
2281 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
2282 acornscsi_sbic_xfcount(host);
2283 acornscsi_dma_stop(host);
2284 acornscsi_sendmessage(host);
2285 break;
2286
2287 case 0x1f: /* message in */
2288 case 0x4f: /* message in */
2289 case 0x8f: /* message in */
2290 /* DATA IN -> MESSAGE IN */
2291 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
2292 acornscsi_sbic_xfcount(host);
2293 acornscsi_dma_stop(host);
2294 acornscsi_message(host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */
2295 break;
2296
2297 default:
2298 printk(KERN_ERR "scsi%d.%c: PHASE_DATAIN, SSR %02X?\n",
2299 host->host->host_no, acornscsi_target(host), ssr);
2300 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2301 }
2302 return INTR_PROCESSING;
2303
2304 case PHASE_DATAOUT: /* STATE: transferred data out */
2305 /*
2306 * This is more complicated - if we disconnect, the DMA could be 12
2307 * bytes ahead of us. We need to correct this.
2308 */
2309 switch (ssr) {
2310 case 0x18: /* -> PHASE_DATAOUT */
2311 case 0x88: /* -> PHASE_DATAOUT */
2312 acornscsi_abortcmd(host, host->SCpnt->tag);
2313 return INTR_IDLE;
2314
2315 case 0x1b: /* -> PHASE_STATUSIN */
2316 case 0x4b: /* -> PHASE_STATUSIN */
2317 case 0x8b: /* -> PHASE_STATUSIN */
2318 /* DATA OUT -> STATUS */
2319 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
2320 acornscsi_sbic_xfcount(host);
2321 acornscsi_dma_stop(host);
2322 acornscsi_dma_adjust(host);
2323 acornscsi_readstatusbyte(host);
2324 host->scsi.phase = PHASE_STATUSIN;
2325 break;
2326
2327 case 0x1e: /* -> PHASE_MSGOUT */
2328 case 0x4e: /* -> PHASE_MSGOUT */
2329 case 0x8e: /* -> PHASE_MSGOUT */
2330 /* DATA OUT -> MESSAGE OUT */
2331 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
2332 acornscsi_sbic_xfcount(host);
2333 acornscsi_dma_stop(host);
2334 acornscsi_dma_adjust(host);
2335 acornscsi_sendmessage(host);
2336 break;
2337
2338 case 0x1f: /* message in */
2339 case 0x4f: /* message in */
2340 case 0x8f: /* message in */
2341 /* DATA OUT -> MESSAGE IN */
2342 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
2343 acornscsi_sbic_xfcount(host);
2344 acornscsi_dma_stop(host);
2345 acornscsi_dma_adjust(host);
2346 acornscsi_message(host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */
2347 break;
2348
2349 default:
2350 printk(KERN_ERR "scsi%d.%c: PHASE_DATAOUT, SSR %02X?\n",
2351 host->host->host_no, acornscsi_target(host), ssr);
2352 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2353 }
2354 return INTR_PROCESSING;
2355
2356 case PHASE_STATUSIN: /* STATE: status in complete */
2357 switch (ssr) {
2358 case 0x1f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */
2359 case 0x8f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */
2360 /* STATUS -> MESSAGE IN */
2361 acornscsi_message(host);
2362 break;
2363
2364 case 0x1e: /* -> PHASE_MSGOUT */
2365 case 0x8e: /* -> PHASE_MSGOUT */
2366 /* STATUS -> MESSAGE OUT */
2367 acornscsi_sendmessage(host);
2368 break;
2369
2370 default:
2371 printk(KERN_ERR "scsi%d.%c: PHASE_STATUSIN, SSR %02X instead of MESSAGE_IN?\n",
2372 host->host->host_no, acornscsi_target(host), ssr);
2373 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2374 }
2375 return INTR_PROCESSING;
2376
2377 case PHASE_MSGIN: /* STATE: message in */
2378 switch (ssr) {
2379 case 0x1e: /* -> PHASE_MSGOUT */
2380 case 0x4e: /* -> PHASE_MSGOUT */
2381 case 0x8e: /* -> PHASE_MSGOUT */
2382 /* MESSAGE IN -> MESSAGE OUT */
2383 acornscsi_sendmessage(host);
2384 break;
2385
2386 case 0x1f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */
2387 case 0x2f:
2388 case 0x4f:
2389 case 0x8f:
2390 acornscsi_message(host);
2391 break;
2392
2393 case 0x85:
2394 printk("scsi%d.%c: strange message in disconnection\n",
2395 host->host->host_no, acornscsi_target(host));
2396 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2397 acornscsi_done(host, &host->SCpnt, DID_ERROR);
2398 break;
2399
2400 default:
2401 printk(KERN_ERR "scsi%d.%c: PHASE_MSGIN, SSR %02X after message in?\n",
2402 host->host->host_no, acornscsi_target(host), ssr);
2403 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2404 }
2405 return INTR_PROCESSING;
2406
2407 case PHASE_DONE: /* STATE: received status & message */
2408 switch (ssr) {
2409 case 0x85: /* -> PHASE_IDLE */
2410 acornscsi_done(host, &host->SCpnt, DID_OK);
2411 return INTR_NEXT_COMMAND;
2412
2413 case 0x1e:
2414 case 0x8e:
2415 acornscsi_sendmessage(host);
2416 break;
2417
2418 default:
2419 printk(KERN_ERR "scsi%d.%c: PHASE_DONE, SSR %02X instead of disconnect?\n",
2420 host->host->host_no, acornscsi_target(host), ssr);
2421 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2422 }
2423 return INTR_PROCESSING;
2424
2425 case PHASE_ABORTED:
2426 switch (ssr) {
2427 case 0x85:
2428 if (host->SCpnt)
2429 acornscsi_done(host, &host->SCpnt, DID_ABORT);
2430 else {
2431 clear_bit(host->scsi.reconnected.target * 8 + host->scsi.reconnected.lun,
2432 host->busyluns);
2433 host->scsi.phase = PHASE_IDLE;
2434 }
2435 return INTR_NEXT_COMMAND;
2436
2437 case 0x1e:
2438 case 0x2e:
2439 case 0x4e:
2440 case 0x8e:
2441 acornscsi_sendmessage(host);
2442 break;
2443
2444 default:
2445 printk(KERN_ERR "scsi%d.%c: PHASE_ABORTED, SSR %02X?\n",
2446 host->host->host_no, acornscsi_target(host), ssr);
2447 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2448 }
2449 return INTR_PROCESSING;
2450
2451 default:
2452 printk(KERN_ERR "scsi%d.%c: unknown driver phase %d\n",
2453 host->host->host_no, acornscsi_target(host), ssr);
2454 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2455 }
2456 return INTR_PROCESSING;
2457 }
2458
2459 /*
2460 * Prototype: void acornscsi_intr(int irq, void *dev_id)
2461 * Purpose : handle interrupts from Acorn SCSI card
2462 * Params : irq - interrupt number
2463 * dev_id - device specific data (AS_Host structure)
2464 */
2465 static irqreturn_t
2466 acornscsi_intr(int irq, void *dev_id)
2467 {
2468 AS_Host *host = (AS_Host *)dev_id;
2469 intr_ret_t ret;
2470 int iostatus;
2471 int in_irq = 0;
2472
2473 do {
2474 ret = INTR_IDLE;
2475
2476 iostatus = readb(host->fast + INT_REG);
2477
2478 if (iostatus & 2) {
2479 acornscsi_dma_intr(host);
2480 iostatus = readb(host->fast + INT_REG);
2481 }
2482
2483 if (iostatus & 8)
2484 ret = acornscsi_sbicintr(host, in_irq);
2485
2486 /*
2487 * If we have a transfer pending, start it.
2488 * Only start it if the interface has already started transferring
2489 * it's data
2490 */
2491 if (host->dma.xfer_required)
2492 acornscsi_dma_xfer(host);
2493
2494 if (ret == INTR_NEXT_COMMAND)
2495 ret = acornscsi_kick(host);
2496
2497 in_irq = 1;
2498 } while (ret != INTR_IDLE);
2499
2500 return IRQ_HANDLED;
2501 }
2502
2503 /*=============================================================================================
2504 * Interfaces between interrupt handler and rest of scsi code
2505 */
2506
2507 /*
2508 * Function : acornscsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
2509 * Purpose : queues a SCSI command
2510 * Params : cmd - SCSI command
2511 * done - function called on completion, with pointer to command descriptor
2512 * Returns : 0, or < 0 on error.
2513 */
2514 static int acornscsi_queuecmd_lck(struct scsi_cmnd *SCpnt,
2515 void (*done)(struct scsi_cmnd *))
2516 {
2517 AS_Host *host = (AS_Host *)SCpnt->device->host->hostdata;
2518
2519 if (!done) {
2520 /* there should be some way of rejecting errors like this without panicing... */
2521 panic("scsi%d: queuecommand called with NULL done function [cmd=%p]",
2522 host->host->host_no, SCpnt);
2523 return -EINVAL;
2524 }
2525
2526 #if (DEBUG & DEBUG_NO_WRITE)
2527 if (acornscsi_cmdtype(SCpnt->cmnd[0]) == CMD_WRITE && (NO_WRITE & (1 << SCpnt->device->id))) {
2528 printk(KERN_CRIT "scsi%d.%c: WRITE attempted with NO_WRITE flag set\n",
2529 host->host->host_no, '0' + SCpnt->device->id);
2530 SCpnt->result = DID_NO_CONNECT << 16;
2531 done(SCpnt);
2532 return 0;
2533 }
2534 #endif
2535
2536 SCpnt->scsi_done = done;
2537 SCpnt->host_scribble = NULL;
2538 SCpnt->result = 0;
2539 SCpnt->tag = 0;
2540 SCpnt->SCp.phase = (int)acornscsi_datadirection(SCpnt->cmnd[0]);
2541 SCpnt->SCp.sent_command = 0;
2542 SCpnt->SCp.scsi_xferred = 0;
2543
2544 init_SCp(SCpnt);
2545
2546 host->stats.queues += 1;
2547
2548 {
2549 unsigned long flags;
2550
2551 if (!queue_add_cmd_ordered(&host->queues.issue, SCpnt)) {
2552 SCpnt->result = DID_ERROR << 16;
2553 done(SCpnt);
2554 return 0;
2555 }
2556 local_irq_save(flags);
2557 if (host->scsi.phase == PHASE_IDLE)
2558 acornscsi_kick(host);
2559 local_irq_restore(flags);
2560 }
2561 return 0;
2562 }
2563
2564 DEF_SCSI_QCMD(acornscsi_queuecmd)
2565
2566 /*
2567 * Prototype: void acornscsi_reportstatus(struct scsi_cmnd **SCpntp1, struct scsi_cmnd **SCpntp2, int result)
2568 * Purpose : pass a result to *SCpntp1, and check if *SCpntp1 = *SCpntp2
2569 * Params : SCpntp1 - pointer to command to return
2570 * SCpntp2 - pointer to command to check
2571 * result - result to pass back to mid-level done function
2572 * Returns : *SCpntp2 = NULL if *SCpntp1 is the same command structure as *SCpntp2.
2573 */
2574 static inline void acornscsi_reportstatus(struct scsi_cmnd **SCpntp1,
2575 struct scsi_cmnd **SCpntp2,
2576 int result)
2577 {
2578 struct scsi_cmnd *SCpnt = *SCpntp1;
2579
2580 if (SCpnt) {
2581 *SCpntp1 = NULL;
2582
2583 SCpnt->result = result;
2584 SCpnt->scsi_done(SCpnt);
2585 }
2586
2587 if (SCpnt == *SCpntp2)
2588 *SCpntp2 = NULL;
2589 }
2590
2591 enum res_abort { res_not_running, res_success, res_success_clear, res_snooze };
2592
2593 /*
2594 * Prototype: enum res acornscsi_do_abort(struct scsi_cmnd *SCpnt)
2595 * Purpose : abort a command on this host
2596 * Params : SCpnt - command to abort
2597 * Returns : our abort status
2598 */
2599 static enum res_abort acornscsi_do_abort(AS_Host *host, struct scsi_cmnd *SCpnt)
2600 {
2601 enum res_abort res = res_not_running;
2602
2603 if (queue_remove_cmd(&host->queues.issue, SCpnt)) {
2604 /*
2605 * The command was on the issue queue, and has not been
2606 * issued yet. We can remove the command from the queue,
2607 * and acknowledge the abort. Neither the devices nor the
2608 * interface know about the command.
2609 */
2610 //#if (DEBUG & DEBUG_ABORT)
2611 printk("on issue queue ");
2612 //#endif
2613 res = res_success;
2614 } else if (queue_remove_cmd(&host->queues.disconnected, SCpnt)) {
2615 /*
2616 * The command was on the disconnected queue. Simply
2617 * acknowledge the abort condition, and when the target
2618 * reconnects, we will give it an ABORT message. The
2619 * target should then disconnect, and we will clear
2620 * the busylun bit.
2621 */
2622 //#if (DEBUG & DEBUG_ABORT)
2623 printk("on disconnected queue ");
2624 //#endif
2625 res = res_success;
2626 } else if (host->SCpnt == SCpnt) {
2627 unsigned long flags;
2628
2629 //#if (DEBUG & DEBUG_ABORT)
2630 printk("executing ");
2631 //#endif
2632
2633 local_irq_save(flags);
2634 switch (host->scsi.phase) {
2635 /*
2636 * If the interface is idle, and the command is 'disconnectable',
2637 * then it is the same as on the disconnected queue. We simply
2638 * remove all traces of the command. When the target reconnects,
2639 * we will give it an ABORT message since the command could not
2640 * be found. When the target finally disconnects, we will clear
2641 * the busylun bit.
2642 */
2643 case PHASE_IDLE:
2644 if (host->scsi.disconnectable) {
2645 host->scsi.disconnectable = 0;
2646 host->SCpnt = NULL;
2647 res = res_success;
2648 }
2649 break;
2650
2651 /*
2652 * If the command has connected and done nothing further,
2653 * simply force a disconnect. We also need to clear the
2654 * busylun bit.
2655 */
2656 case PHASE_CONNECTED:
2657 sbic_arm_write(host, SBIC_CMND, CMND_DISCONNECT);
2658 host->SCpnt = NULL;
2659 res = res_success_clear;
2660 break;
2661
2662 default:
2663 acornscsi_abortcmd(host, host->SCpnt->tag);
2664 res = res_snooze;
2665 }
2666 local_irq_restore(flags);
2667 } else if (host->origSCpnt == SCpnt) {
2668 /*
2669 * The command will be executed next, but a command
2670 * is currently using the interface. This is similar to
2671 * being on the issue queue, except the busylun bit has
2672 * been set.
2673 */
2674 host->origSCpnt = NULL;
2675 //#if (DEBUG & DEBUG_ABORT)
2676 printk("waiting for execution ");
2677 //#endif
2678 res = res_success_clear;
2679 } else
2680 printk("unknown ");
2681
2682 return res;
2683 }
2684
2685 /*
2686 * Prototype: int acornscsi_abort(struct scsi_cmnd *SCpnt)
2687 * Purpose : abort a command on this host
2688 * Params : SCpnt - command to abort
2689 * Returns : one of SCSI_ABORT_ macros
2690 */
2691 int acornscsi_abort(struct scsi_cmnd *SCpnt)
2692 {
2693 AS_Host *host = (AS_Host *) SCpnt->device->host->hostdata;
2694 int result;
2695
2696 host->stats.aborts += 1;
2697
2698 #if (DEBUG & DEBUG_ABORT)
2699 {
2700 int asr, ssr;
2701 asr = sbic_arm_read(host, SBIC_ASR);
2702 ssr = sbic_arm_read(host, SBIC_SSR);
2703
2704 printk(KERN_WARNING "acornscsi_abort: ");
2705 print_sbic_status(asr, ssr, host->scsi.phase);
2706 acornscsi_dumplog(host, SCpnt->device->id);
2707 }
2708 #endif
2709
2710 printk("scsi%d: ", host->host->host_no);
2711
2712 switch (acornscsi_do_abort(host, SCpnt)) {
2713 /*
2714 * We managed to find the command and cleared it out.
2715 * We do not expect the command to be executing on the
2716 * target, but we have set the busylun bit.
2717 */
2718 case res_success_clear:
2719 //#if (DEBUG & DEBUG_ABORT)
2720 printk("clear ");
2721 //#endif
2722 clear_bit(SCpnt->device->id * 8 + SCpnt->device->lun, host->busyluns);
2723
2724 /*
2725 * We found the command, and cleared it out. Either
2726 * the command is still known to be executing on the
2727 * target, or the busylun bit is not set.
2728 */
2729 case res_success:
2730 //#if (DEBUG & DEBUG_ABORT)
2731 printk("success\n");
2732 //#endif
2733 result = SUCCESS;
2734 break;
2735
2736 /*
2737 * We did find the command, but unfortunately we couldn't
2738 * unhook it from ourselves. Wait some more, and if it
2739 * still doesn't complete, reset the interface.
2740 */
2741 case res_snooze:
2742 //#if (DEBUG & DEBUG_ABORT)
2743 printk("snooze\n");
2744 //#endif
2745 result = FAILED;
2746 break;
2747
2748 /*
2749 * The command could not be found (either because it completed,
2750 * or it got dropped.
2751 */
2752 default:
2753 case res_not_running:
2754 acornscsi_dumplog(host, SCpnt->device->id);
2755 result = FAILED;
2756 //#if (DEBUG & DEBUG_ABORT)
2757 printk("not running\n");
2758 //#endif
2759 break;
2760 }
2761
2762 return result;
2763 }
2764
2765 /*
2766 * Prototype: int acornscsi_reset(struct scsi_cmnd *SCpnt)
2767 * Purpose : reset a command on this host/reset this host
2768 * Params : SCpnt - command causing reset
2769 * Returns : one of SCSI_RESET_ macros
2770 */
2771 int acornscsi_bus_reset(struct scsi_cmnd *SCpnt)
2772 {
2773 AS_Host *host = (AS_Host *)SCpnt->device->host->hostdata;
2774 struct scsi_cmnd *SCptr;
2775
2776 host->stats.resets += 1;
2777
2778 #if (DEBUG & DEBUG_RESET)
2779 {
2780 int asr, ssr;
2781
2782 asr = sbic_arm_read(host, SBIC_ASR);
2783 ssr = sbic_arm_read(host, SBIC_SSR);
2784
2785 printk(KERN_WARNING "acornscsi_reset: ");
2786 print_sbic_status(asr, ssr, host->scsi.phase);
2787 acornscsi_dumplog(host, SCpnt->device->id);
2788 }
2789 #endif
2790
2791 acornscsi_dma_stop(host);
2792
2793 /*
2794 * do hard reset. This resets all devices on this host, and so we
2795 * must set the reset status on all commands.
2796 */
2797 acornscsi_resetcard(host);
2798
2799 while ((SCptr = queue_remove(&host->queues.disconnected)) != NULL)
2800 ;
2801
2802 return SUCCESS;
2803 }
2804
2805 /*==============================================================================================
2806 * initialisation & miscellaneous support
2807 */
2808
2809 /*
2810 * Function: char *acornscsi_info(struct Scsi_Host *host)
2811 * Purpose : return a string describing this interface
2812 * Params : host - host to give information on
2813 * Returns : a constant string
2814 */
2815 const
2816 char *acornscsi_info(struct Scsi_Host *host)
2817 {
2818 static char string[100], *p;
2819
2820 p = string;
2821
2822 p += sprintf(string, "%s at port %08lX irq %d v%d.%d.%d"
2823 #ifdef CONFIG_SCSI_ACORNSCSI_SYNC
2824 " SYNC"
2825 #endif
2826 #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
2827 " TAG"
2828 #endif
2829 #ifdef CONFIG_SCSI_ACORNSCSI_LINK
2830 " LINK"
2831 #endif
2832 #if (DEBUG & DEBUG_NO_WRITE)
2833 " NOWRITE (" __stringify(NO_WRITE) ")"
2834 #endif
2835 , host->hostt->name, host->io_port, host->irq,
2836 VER_MAJOR, VER_MINOR, VER_PATCH);
2837 return string;
2838 }
2839
2840 int acornscsi_proc_info(struct Scsi_Host *instance, char *buffer, char **start, off_t offset,
2841 int length, int inout)
2842 {
2843 int pos, begin = 0, devidx;
2844 struct scsi_device *scd;
2845 AS_Host *host;
2846 char *p = buffer;
2847
2848 if (inout == 1)
2849 return -EINVAL;
2850
2851 host = (AS_Host *)instance->hostdata;
2852
2853 p += sprintf(p, "AcornSCSI driver v%d.%d.%d"
2854 #ifdef CONFIG_SCSI_ACORNSCSI_SYNC
2855 " SYNC"
2856 #endif
2857 #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
2858 " TAG"
2859 #endif
2860 #ifdef CONFIG_SCSI_ACORNSCSI_LINK
2861 " LINK"
2862 #endif
2863 #if (DEBUG & DEBUG_NO_WRITE)
2864 " NOWRITE (" __stringify(NO_WRITE) ")"
2865 #endif
2866 "\n\n", VER_MAJOR, VER_MINOR, VER_PATCH);
2867
2868 p += sprintf(p, "SBIC: WD33C93A Address: %p IRQ : %d\n",
2869 host->base + SBIC_REGIDX, host->scsi.irq);
2870 #ifdef USE_DMAC
2871 p += sprintf(p, "DMAC: uPC71071 Address: %p IRQ : %d\n\n",
2872 host->base + DMAC_OFFSET, host->scsi.irq);
2873 #endif
2874
2875 p += sprintf(p, "Statistics:\n"
2876 "Queued commands: %-10u Issued commands: %-10u\n"
2877 "Done commands : %-10u Reads : %-10u\n"
2878 "Writes : %-10u Others : %-10u\n"
2879 "Disconnects : %-10u Aborts : %-10u\n"
2880 "Resets : %-10u\n\nLast phases:",
2881 host->stats.queues, host->stats.removes,
2882 host->stats.fins, host->stats.reads,
2883 host->stats.writes, host->stats.miscs,
2884 host->stats.disconnects, host->stats.aborts,
2885 host->stats.resets);
2886
2887 for (devidx = 0; devidx < 9; devidx ++) {
2888 unsigned int statptr, prev;
2889
2890 p += sprintf(p, "\n%c:", devidx == 8 ? 'H' : ('0' + devidx));
2891 statptr = host->status_ptr[devidx] - 10;
2892
2893 if ((signed int)statptr < 0)
2894 statptr += STATUS_BUFFER_SIZE;
2895
2896 prev = host->status[devidx][statptr].when;
2897
2898 for (; statptr != host->status_ptr[devidx]; statptr = (statptr + 1) & (STATUS_BUFFER_SIZE - 1)) {
2899 if (host->status[devidx][statptr].when) {
2900 p += sprintf(p, "%c%02X:%02X+%2ld",
2901 host->status[devidx][statptr].irq ? '-' : ' ',
2902 host->status[devidx][statptr].ph,
2903 host->status[devidx][statptr].ssr,
2904 (host->status[devidx][statptr].when - prev) < 100 ?
2905 (host->status[devidx][statptr].when - prev) : 99);
2906 prev = host->status[devidx][statptr].when;
2907 }
2908 }
2909 }
2910
2911 p += sprintf(p, "\nAttached devices:\n");
2912
2913 shost_for_each_device(scd, instance) {
2914 p += sprintf(p, "Device/Lun TaggedQ Sync\n");
2915 p += sprintf(p, " %d/%d ", scd->id, scd->lun);
2916 if (scd->tagged_supported)
2917 p += sprintf(p, "%3sabled(%3d) ",
2918 scd->simple_tags ? "en" : "dis",
2919 scd->current_tag);
2920 else
2921 p += sprintf(p, "unsupported ");
2922
2923 if (host->device[scd->id].sync_xfer & 15)
2924 p += sprintf(p, "offset %d, %d ns\n",
2925 host->device[scd->id].sync_xfer & 15,
2926 acornscsi_getperiod(host->device[scd->id].sync_xfer));
2927 else
2928 p += sprintf(p, "async\n");
2929
2930 pos = p - buffer;
2931 if (pos + begin < offset) {
2932 begin += pos;
2933 p = buffer;
2934 }
2935 pos = p - buffer;
2936 if (pos + begin > offset + length) {
2937 scsi_device_put(scd);
2938 break;
2939 }
2940 }
2941
2942 pos = p - buffer;
2943
2944 *start = buffer + (offset - begin);
2945 pos -= offset - begin;
2946
2947 if (pos > length)
2948 pos = length;
2949
2950 return pos;
2951 }
2952
2953 static struct scsi_host_template acornscsi_template = {
2954 .module = THIS_MODULE,
2955 .proc_info = acornscsi_proc_info,
2956 .name = "AcornSCSI",
2957 .info = acornscsi_info,
2958 .queuecommand = acornscsi_queuecmd,
2959 .eh_abort_handler = acornscsi_abort,
2960 .eh_bus_reset_handler = acornscsi_bus_reset,
2961 .can_queue = 16,
2962 .this_id = 7,
2963 .sg_tablesize = SG_ALL,
2964 .cmd_per_lun = 2,
2965 .use_clustering = DISABLE_CLUSTERING,
2966 .proc_name = "acornscsi",
2967 };
2968
2969 static int __devinit
2970 acornscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
2971 {
2972 struct Scsi_Host *host;
2973 AS_Host *ashost;
2974 int ret;
2975
2976 ret = ecard_request_resources(ec);
2977 if (ret)
2978 goto out;
2979
2980 host = scsi_host_alloc(&acornscsi_template, sizeof(AS_Host));
2981 if (!host) {
2982 ret = -ENOMEM;
2983 goto out_release;
2984 }
2985
2986 ashost = (AS_Host *)host->hostdata;
2987
2988 ashost->base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
2989 ashost->fast = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
2990 if (!ashost->base || !ashost->fast)
2991 goto out_put;
2992
2993 host->irq = ec->irq;
2994 ashost->host = host;
2995 ashost->scsi.irq = host->irq;
2996
2997 ec->irqaddr = ashost->fast + INT_REG;
2998 ec->irqmask = 0x0a;
2999
3000 ret = request_irq(host->irq, acornscsi_intr, IRQF_DISABLED, "acornscsi", ashost);
3001 if (ret) {
3002 printk(KERN_CRIT "scsi%d: IRQ%d not free: %d\n",
3003 host->host_no, ashost->scsi.irq, ret);
3004 goto out_put;
3005 }
3006
3007 memset(&ashost->stats, 0, sizeof (ashost->stats));
3008 queue_initialise(&ashost->queues.issue);
3009 queue_initialise(&ashost->queues.disconnected);
3010 msgqueue_initialise(&ashost->scsi.msgs);
3011
3012 acornscsi_resetcard(ashost);
3013
3014 ret = scsi_add_host(host, &ec->dev);
3015 if (ret)
3016 goto out_irq;
3017
3018 scsi_scan_host(host);
3019 goto out;
3020
3021 out_irq:
3022 free_irq(host->irq, ashost);
3023 msgqueue_free(&ashost->scsi.msgs);
3024 queue_free(&ashost->queues.disconnected);
3025 queue_free(&ashost->queues.issue);
3026 out_put:
3027 ecardm_iounmap(ec, ashost->fast);
3028 ecardm_iounmap(ec, ashost->base);
3029 scsi_host_put(host);
3030 out_release:
3031 ecard_release_resources(ec);
3032 out:
3033 return ret;
3034 }
3035
3036 static void __devexit acornscsi_remove(struct expansion_card *ec)
3037 {
3038 struct Scsi_Host *host = ecard_get_drvdata(ec);
3039 AS_Host *ashost = (AS_Host *)host->hostdata;
3040
3041 ecard_set_drvdata(ec, NULL);
3042 scsi_remove_host(host);
3043
3044 /*
3045 * Put card into RESET state
3046 */
3047 writeb(0x80, ashost->fast + PAGE_REG);
3048
3049 free_irq(host->irq, ashost);
3050
3051 msgqueue_free(&ashost->scsi.msgs);
3052 queue_free(&ashost->queues.disconnected);
3053 queue_free(&ashost->queues.issue);
3054 ecardm_iounmap(ec, ashost->fast);
3055 ecardm_iounmap(ec, ashost->base);
3056 scsi_host_put(host);
3057 ecard_release_resources(ec);
3058 }
3059
3060 static const struct ecard_id acornscsi_cids[] = {
3061 { MANU_ACORN, PROD_ACORN_SCSI },
3062 { 0xffff, 0xffff },
3063 };
3064
3065 static struct ecard_driver acornscsi_driver = {
3066 .probe = acornscsi_probe,
3067 .remove = __devexit_p(acornscsi_remove),
3068 .id_table = acornscsi_cids,
3069 .drv = {
3070 .name = "acornscsi",
3071 },
3072 };
3073
3074 static int __init acornscsi_init(void)
3075 {
3076 return ecard_register_driver(&acornscsi_driver);
3077 }
3078
3079 static void __exit acornscsi_exit(void)
3080 {
3081 ecard_remove_driver(&acornscsi_driver);
3082 }
3083
3084 module_init(acornscsi_init);
3085 module_exit(acornscsi_exit);
3086
3087 MODULE_AUTHOR("Russell King");
3088 MODULE_DESCRIPTION("AcornSCSI driver");
3089 MODULE_LICENSE("GPL");