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IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
[net-next-2.6.git] / drivers / scsi / arm / acornscsi.c
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1da177e4
LT		 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 explaination 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#ifndef STRINGIFY
127#define STRINGIFY(x) #x
128#endif
129#define STRx(x) STRINGIFY(x)
130#define NO_WRITE_STR STRx(NO_WRITE)
131
1da177e4
LT		 132#include <linux/module.h>
133#include <linux/kernel.h>
134#include <linux/sched.h>
135#include <linux/string.h>
136#include <linux/signal.h>
137#include <linux/errno.h>
138#include <linux/proc_fs.h>
139#include <linux/ioport.h>
140#include <linux/blkdev.h>
141#include <linux/delay.h>
142#include <linux/interrupt.h>
143#include <linux/init.h>
144#include <linux/bitops.h>
145
146#include <asm/system.h>
147#include <asm/io.h>
1da177e4
LT		 148#include <asm/ecard.h>
149
150#include "../scsi.h"
db9dff36 151#include <scsi/scsi_dbg.h>
1da177e4 152#include <scsi/scsi_host.h>
1abfd370 153#include <scsi/scsi_transport_spi.h>
1da177e4
LT		 154#include "acornscsi.h"
155#include "msgqueue.h"
156#include "scsi.h"
157
158#include <scsi/scsicam.h>
159
160#define VER_MAJOR 2
161#define VER_MINOR 0
162#define VER_PATCH 6
163
164#ifndef ABORT_TAG
165#define ABORT_TAG 0xd
166#else
167#error "Yippee! ABORT TAG is now defined! Remove this error!"
168#endif
169
170#ifdef CONFIG_SCSI_ACORNSCSI_LINK
171#error SCSI2 LINKed commands not supported (yet)!
172#endif
173
174#ifdef USE_DMAC
175/*
176 * DMAC setup parameters
177 */
178#define INIT_DEVCON0 (DEVCON0_RQL|DEVCON0_EXW|DEVCON0_CMP)
179#define INIT_DEVCON1 (DEVCON1_BHLD)
180#define DMAC_READ (MODECON_READ)
181#define DMAC_WRITE (MODECON_WRITE)
182#define INIT_SBICDMA (CTRL_DMABURST)
183
184#define scsi_xferred have_data_in
185
186/*
187 * Size of on-board DMA buffer
188 */
189#define DMAC_BUFFER_SIZE 65536
190#endif
191
192#define STATUS_BUFFER_TO_PRINT 24
193
194unsigned int sdtr_period = SDTR_PERIOD;
195unsigned int sdtr_size = SDTR_SIZE;
196
ee0ca6ba
HK		 197static void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp,
198 unsigned int result);
1da177e4
LT		 199static int acornscsi_reconnect_finish(AS_Host *host);
200static void acornscsi_dma_cleanup(AS_Host *host);
201static void acornscsi_abortcmd(AS_Host *host, unsigned char tag);
202
203/* ====================================================================================
204 * Miscellaneous
205 */
206
207static inline void
208sbic_arm_write(unsigned int io_port, int reg, int value)
209{
210 __raw_writeb(reg, io_port);
211 __raw_writeb(value, io_port + 4);
212}
213
214#define sbic_arm_writenext(io,val) \
215 __raw_writeb((val), (io) + 4)
216
217static inline
218int sbic_arm_read(unsigned int io_port, int reg)
219{
220 if(reg == SBIC_ASR)
221 return __raw_readl(io_port) & 255;
222 __raw_writeb(reg, io_port);
223 return __raw_readl(io_port + 4) & 255;
224}
225
226#define sbic_arm_readnext(io) \
227 __raw_readb((io) + 4)
228
229#ifdef USE_DMAC
230#define dmac_read(io_port,reg) \
231 inb((io_port) + (reg))
232
233#define dmac_write(io_port,reg,value) \
234 ({ outb((value), (io_port) + (reg)); })
235
236#define dmac_clearintr(io_port) \
237 ({ outb(0, (io_port)); })
238
239static inline
240unsigned int dmac_address(unsigned int io_port)
241{
242 return dmac_read(io_port, DMAC_TXADRHI) << 16 |
243 dmac_read(io_port, DMAC_TXADRMD) << 8 |
244 dmac_read(io_port, DMAC_TXADRLO);
245}
246
247static
248void acornscsi_dumpdma(AS_Host *host, char *where)
249{
250 unsigned int mode, addr, len;
251
252 mode = dmac_read(host->dma.io_port, DMAC_MODECON);
253 addr = dmac_address(host->dma.io_port);
254 len = dmac_read(host->dma.io_port, DMAC_TXCNTHI) << 8 |
255 dmac_read(host->dma.io_port, DMAC_TXCNTLO);
256
257 printk("scsi%d: %s: DMAC %02x @%06x+%04x msk %02x, ",
258 host->host->host_no, where,
259 mode, addr, (len + 1) & 0xffff,
260 dmac_read(host->dma.io_port, DMAC_MASKREG));
261
262 printk("DMA @%06x, ", host->dma.start_addr);
263 printk("BH @%p +%04x, ", host->scsi.SCp.ptr,
264 host->scsi.SCp.this_residual);
265 printk("DT @+%04x ST @+%04x", host->dma.transferred,
266 host->scsi.SCp.scsi_xferred);
267 printk("\n");
268}
269#endif
270
271static
272unsigned long acornscsi_sbic_xfcount(AS_Host *host)
273{
274 unsigned long length;
275
276 length = sbic_arm_read(host->scsi.io_port, SBIC_TRANSCNTH) << 16;
277 length |= sbic_arm_readnext(host->scsi.io_port) << 8;
278 length |= sbic_arm_readnext(host->scsi.io_port);
279
280 return length;
281}
282
283static int
284acornscsi_sbic_wait(AS_Host *host, int stat_mask, int stat, int timeout, char *msg)
285{
286 int asr;
287
288 do {
289 asr = sbic_arm_read(host->scsi.io_port, SBIC_ASR);
290
291 if ((asr & stat_mask) == stat)
292 return 0;
293
294 udelay(1);
295 } while (--timeout);
296
297 printk("scsi%d: timeout while %s\n", host->host->host_no, msg);
298
299 return -1;
300}
301
302static
303int acornscsi_sbic_issuecmd(AS_Host *host, int command)
304{
305 if (acornscsi_sbic_wait(host, ASR_CIP, 0, 1000, "issuing command"))
306 return -1;
307
308 sbic_arm_write(host->scsi.io_port, SBIC_CMND, command);
309
310 return 0;
311}
312
313static void
314acornscsi_csdelay(unsigned int cs)
315{
316 unsigned long target_jiffies, flags;
317
318 target_jiffies = jiffies + 1 + cs * HZ / 100;
319
320 local_save_flags(flags);
321 local_irq_enable();
322
323 while (time_before(jiffies, target_jiffies)) barrier();
324
325 local_irq_restore(flags);
326}
327
328static
329void acornscsi_resetcard(AS_Host *host)
330{
331 unsigned int i, timeout;
332
333 /* assert reset line */
334 host->card.page_reg = 0x80;
335 outb(host->card.page_reg, host->card.io_page);
336
337 /* wait 3 cs. SCSI standard says 25ms. */
338 acornscsi_csdelay(3);
339
340 host->card.page_reg = 0;
341 outb(host->card.page_reg, host->card.io_page);
342
343 /*
344 * Should get a reset from the card
345 */
346 timeout = 1000;
347 do {
348 if (inb(host->card.io_intr) & 8)
349 break;
350 udelay(1);
351 } while (--timeout);
352
353 if (timeout == 0)
354 printk("scsi%d: timeout while resetting card\n",
355 host->host->host_no);
356
357 sbic_arm_read(host->scsi.io_port, SBIC_ASR);
358 sbic_arm_read(host->scsi.io_port, SBIC_SSR);
359
360 /* setup sbic - WD33C93A */
361 sbic_arm_write(host->scsi.io_port, SBIC_OWNID, OWNID_EAF | host->host->this_id);
362 sbic_arm_write(host->scsi.io_port, SBIC_CMND, CMND_RESET);
363
364 /*
365 * Command should cause a reset interrupt
366 */
367 timeout = 1000;
368 do {
369 if (inb(host->card.io_intr) & 8)
370 break;
371 udelay(1);
372 } while (--timeout);
373
374 if (timeout == 0)
375 printk("scsi%d: timeout while resetting card\n",
376 host->host->host_no);
377
378 sbic_arm_read(host->scsi.io_port, SBIC_ASR);
379 if (sbic_arm_read(host->scsi.io_port, SBIC_SSR) != 0x01)
380 printk(KERN_CRIT "scsi%d: WD33C93A didn't give enhanced reset interrupt\n",
381 host->host->host_no);
382
383 sbic_arm_write(host->scsi.io_port, SBIC_CTRL, INIT_SBICDMA | CTRL_IDI);
384 sbic_arm_write(host->scsi.io_port, SBIC_TIMEOUT, TIMEOUT_TIME);
385 sbic_arm_write(host->scsi.io_port, SBIC_SYNCHTRANSFER, SYNCHTRANSFER_2DBA);
386 sbic_arm_write(host->scsi.io_port, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP);
387
388 host->card.page_reg = 0x40;
389 outb(host->card.page_reg, host->card.io_page);
390
391 /* setup dmac - uPC71071 */
392 dmac_write(host->dma.io_port, DMAC_INIT, 0);
393#ifdef USE_DMAC
394 dmac_write(host->dma.io_port, DMAC_INIT, INIT_8BIT);
395 dmac_write(host->dma.io_port, DMAC_CHANNEL, CHANNEL_0);
396 dmac_write(host->dma.io_port, DMAC_DEVCON0, INIT_DEVCON0);
397 dmac_write(host->dma.io_port, DMAC_DEVCON1, INIT_DEVCON1);
398#endif
399
400 host->SCpnt = NULL;
401 host->scsi.phase = PHASE_IDLE;
402 host->scsi.disconnectable = 0;
403
404 memset(host->busyluns, 0, sizeof(host->busyluns));
405
406 for (i = 0; i < 8; i++) {
407 host->device[i].sync_state = SYNC_NEGOCIATE;
408 host->device[i].disconnect_ok = 1;
409 }
410
411 /* wait 25 cs. SCSI standard says 250ms. */
412 acornscsi_csdelay(25);
413}
414
415/*=============================================================================================
416 * Utility routines (eg. debug)
417 */
418#ifdef CONFIG_ACORNSCSI_CONSTANTS
419static char *acornscsi_interrupttype[] = {
420 "rst", "suc", "p/a", "3",
421 "term", "5", "6", "7",
422 "serv", "9", "a", "b",
423 "c", "d", "e", "f"
424};
425
426static signed char acornscsi_map[] = {
427 0, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
428 -1, 2, -1, -1, -1, -1, 3, -1, 4, 5, 6, 7, 8, 9, 10, 11,
429 12, 13, 14, -1, -1, -1, -1, -1, 4, 5, 6, 7, 8, 9, 10, 11,
430 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
431 15, 16, 17, 18, 19, -1, -1, 20, 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 21, 22, -1, -1, -1, 23, -1, -1, 4, 5, 6, 7, 8, 9, 10, 11,
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 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
440 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
441 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
442 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
443};
444
445static char *acornscsi_interruptcode[] = {
446 /* 0 */
447 "reset - normal mode", /* 00 */
448 "reset - advanced mode", /* 01 */
449
450 /* 2 */
451 "sel", /* 11 */
452 "sel+xfer", /* 16 */
453 "data-out", /* 18 */
454 "data-in", /* 19 */
455 "cmd", /* 1A */
456 "stat", /* 1B */
457 "??-out", /* 1C */
458 "??-in", /* 1D */
459 "msg-out", /* 1E */
460 "msg-in", /* 1F */
461
462 /* 12 */
463 "/ACK asserted", /* 20 */
464 "save-data-ptr", /* 21 */
465 "{re}sel", /* 22 */
466
467 /* 15 */
468 "inv cmd", /* 40 */
469 "unexpected disconnect", /* 41 */
470 "sel timeout", /* 42 */
471 "P err", /* 43 */
472 "P err+ATN", /* 44 */
473 "bad status byte", /* 47 */
474
475 /* 21 */
476 "resel, no id", /* 80 */
477 "resel", /* 81 */
478 "discon", /* 85 */
479};
480
481static
482void print_scsi_status(unsigned int ssr)
483{
484 if (acornscsi_map[ssr] != -1)
485 printk("%s:%s",
486 acornscsi_interrupttype[(ssr >> 4)],
487 acornscsi_interruptcode[acornscsi_map[ssr]]);
488 else
489 printk("%X:%X", ssr >> 4, ssr & 0x0f);
490}
491#endif
492
493static
494void print_sbic_status(int asr, int ssr, int cmdphase)
495{
496#ifdef CONFIG_ACORNSCSI_CONSTANTS
497 printk("sbic: %c%c%c%c%c%c ",
498 asr & ASR_INT ? 'I' : 'i',
499 asr & ASR_LCI ? 'L' : 'l',
500 asr & ASR_BSY ? 'B' : 'b',
501 asr & ASR_CIP ? 'C' : 'c',
502 asr & ASR_PE ? 'P' : 'p',
503 asr & ASR_DBR ? 'D' : 'd');
504 printk("scsi: ");
505 print_scsi_status(ssr);
506 printk(" ph %02X\n", cmdphase);
507#else
508 printk("sbic: %02X scsi: %X:%X ph: %02X\n",
509 asr, (ssr & 0xf0)>>4, ssr & 0x0f, cmdphase);
510#endif
511}
512
513static void
514acornscsi_dumplogline(AS_Host *host, int target, int line)
515{
516 unsigned long prev;
517 signed int ptr;
518
519 ptr = host->status_ptr[target] - STATUS_BUFFER_TO_PRINT;
520 if (ptr < 0)
521 ptr += STATUS_BUFFER_SIZE;
522
523 printk("%c: %3s:", target == 8 ? 'H' : '0' + target,
524 line == 0 ? "ph" : line == 1 ? "ssr" : "int");
525
526 prev = host->status[target][ptr].when;
527
528 for (; ptr != host->status_ptr[target]; ptr = (ptr + 1) & (STATUS_BUFFER_SIZE - 1)) {
529 unsigned long time_diff;
530
531 if (!host->status[target][ptr].when)
532 continue;
533
534 switch (line) {
535 case 0:
536 printk("%c%02X", host->status[target][ptr].irq ? '-' : ' ',
537 host->status[target][ptr].ph);
538 break;
539
540 case 1:
541 printk(" %02X", host->status[target][ptr].ssr);
542 break;
543
544 case 2:
545 time_diff = host->status[target][ptr].when - prev;
546 prev = host->status[target][ptr].when;
547 if (time_diff == 0)
548 printk("==^");
549 else if (time_diff >= 100)
550 printk(" ");
551 else
552 printk(" %02ld", time_diff);
553 break;
554 }
555 }
556
557 printk("\n");
558}
559
560static
561void acornscsi_dumplog(AS_Host *host, int target)
562{
563 do {
564 acornscsi_dumplogline(host, target, 0);
565 acornscsi_dumplogline(host, target, 1);
566 acornscsi_dumplogline(host, target, 2);
567
568 if (target == 8)
569 break;
570
571 target = 8;
572 } while (1);
573}
574
575static
576char acornscsi_target(AS_Host *host)
577{
578 if (host->SCpnt)
579 return '0' + host->SCpnt->device->id;
580 return 'H';
581}
582
583/*
584 * Prototype: cmdtype_t acornscsi_cmdtype(int command)
585 * Purpose : differentiate READ from WRITE from other commands
586 * Params : command - command to interpret
587 * Returns : CMD_READ - command reads data,
588 * CMD_WRITE - command writes data,
589 * CMD_MISC - everything else
590 */
591static inline
592cmdtype_t acornscsi_cmdtype(int command)
593{
594 switch (command) {
595 case WRITE_6: case WRITE_10: case WRITE_12:
596 return CMD_WRITE;
597 case READ_6: case READ_10: case READ_12:
598 return CMD_READ;
599 default:
600 return CMD_MISC;
601 }
602}
603
604/*
605 * Prototype: int acornscsi_datadirection(int command)
606 * Purpose : differentiate between commands that have a DATA IN phase
607 * and a DATA OUT phase
608 * Params : command - command to interpret
609 * Returns : DATADIR_OUT - data out phase expected
610 * DATADIR_IN - data in phase expected
611 */
612static
613datadir_t acornscsi_datadirection(int command)
614{
615 switch (command) {
616 case CHANGE_DEFINITION: case COMPARE: case COPY:
617 case COPY_VERIFY: case LOG_SELECT: case MODE_SELECT:
618 case MODE_SELECT_10: case SEND_DIAGNOSTIC: case WRITE_BUFFER:
619 case FORMAT_UNIT: case REASSIGN_BLOCKS: case RESERVE:
620 case SEARCH_EQUAL: case SEARCH_HIGH: case SEARCH_LOW:
621 case WRITE_6: case WRITE_10: case WRITE_VERIFY:
622 case UPDATE_BLOCK: case WRITE_LONG: case WRITE_SAME:
623 case SEARCH_HIGH_12: case SEARCH_EQUAL_12: case SEARCH_LOW_12:
624 case WRITE_12: case WRITE_VERIFY_12: case SET_WINDOW:
625 case MEDIUM_SCAN: case SEND_VOLUME_TAG: case 0xea:
626 return DATADIR_OUT;
627 default:
628 return DATADIR_IN;
629 }
630}
631
632/*
633 * Purpose : provide values for synchronous transfers with 33C93.
634 * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting
635 * Modified by Russell King for 8MHz WD33C93A
636 */
637static struct sync_xfer_tbl {
638 unsigned int period_ns;
639 unsigned char reg_value;
640} sync_xfer_table[] = {
641 { 1, 0x20 }, { 249, 0x20 }, { 374, 0x30 },
642 { 499, 0x40 }, { 624, 0x50 }, { 749, 0x60 },
643 { 874, 0x70 }, { 999, 0x00 }, { 0, 0 }
644};
645
646/*
647 * Prototype: int acornscsi_getperiod(unsigned char syncxfer)
648 * Purpose : period for the synchronous transfer setting
649 * Params : syncxfer SYNCXFER register value
650 * Returns : period in ns.
651 */
652static
653int acornscsi_getperiod(unsigned char syncxfer)
654{
655 int i;
656
657 syncxfer &= 0xf0;
658 if (syncxfer == 0x10)
659 syncxfer = 0;
660
661 for (i = 1; sync_xfer_table[i].period_ns; i++)
662 if (syncxfer == sync_xfer_table[i].reg_value)
663 return sync_xfer_table[i].period_ns;
664 return 0;
665}
666
667/*
668 * Prototype: int round_period(unsigned int period)
669 * Purpose : return index into above table for a required REQ period
670 * Params : period - time (ns) for REQ
671 * Returns : table index
672 * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting
673 */
674static inline
675int round_period(unsigned int period)
676{
677 int i;
678
679 for (i = 1; sync_xfer_table[i].period_ns; i++) {
680 if ((period <= sync_xfer_table[i].period_ns) &&
681 (period > sync_xfer_table[i - 1].period_ns))
682 return i;
683 }
684 return 7;
685}
686
687/*
688 * Prototype: unsigned char calc_sync_xfer(unsigned int period, unsigned int offset)
689 * Purpose : calculate value for 33c93s SYNC register
690 * Params : period - time (ns) for REQ
691 * offset - offset in bytes between REQ/ACK
692 * Returns : value for SYNC register
693 * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting
694 */
695static
696unsigned char calc_sync_xfer(unsigned int period, unsigned int offset)
697{
698 return sync_xfer_table[round_period(period)].reg_value |
699 ((offset < SDTR_SIZE) ? offset : SDTR_SIZE);
700}
701
702/* ====================================================================================
703 * Command functions
704 */
705/*
706 * Function: acornscsi_kick(AS_Host *host)
707 * Purpose : kick next command to interface
708 * Params : host - host to send command to
709 * Returns : INTR_IDLE if idle, otherwise INTR_PROCESSING
710 * Notes : interrupts are always disabled!
711 */
712static
713intr_ret_t acornscsi_kick(AS_Host *host)
714{
715 int from_queue = 0;
ee0ca6ba 716 struct scsi_cmnd *SCpnt;
1da177e4
LT		 717
718 /* first check to see if a command is waiting to be executed */
719 SCpnt = host->origSCpnt;
720 host->origSCpnt = NULL;
721
722 /* retrieve next command */
723 if (!SCpnt) {
724 SCpnt = queue_remove_exclude(&host->queues.issue, host->busyluns);
725 if (!SCpnt)
726 return INTR_IDLE;
727
728 from_queue = 1;
729 }
730
731 if (host->scsi.disconnectable && host->SCpnt) {
732 queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt);
733 host->scsi.disconnectable = 0;
734#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
735 DBG(host->SCpnt, printk("scsi%d.%c: moved command to disconnected queue\n",
736 host->host->host_no, acornscsi_target(host)));
737#endif
738 host->SCpnt = NULL;
739 }
740
741 /*
742 * If we have an interrupt pending, then we may have been reselected.
743 * In this case, we don't want to write to the registers
744 */
745 if (!(sbic_arm_read(host->scsi.io_port, SBIC_ASR) & (ASR_INT|ASR_BSY|ASR_CIP))) {
746 sbic_arm_write(host->scsi.io_port, SBIC_DESTID, SCpnt->device->id);
747 sbic_arm_write(host->scsi.io_port, SBIC_CMND, CMND_SELWITHATN);
748 }
749
750 /*
751 * claim host busy - all of these must happen atomically wrt
752 * our interrupt routine. Failure means command loss.
753 */
754 host->scsi.phase = PHASE_CONNECTING;
755 host->SCpnt = SCpnt;
756 host->scsi.SCp = SCpnt->SCp;
757 host->dma.xfer_setup = 0;
758 host->dma.xfer_required = 0;
759 host->dma.xfer_done = 0;
760
761#if (DEBUG & (DEBUG_ABORT|DEBUG_CONNECT))
762 DBG(SCpnt,printk("scsi%d.%c: starting cmd %02X\n",
763 host->host->host_no, '0' + SCpnt->device->id,
764 SCpnt->cmnd[0]));
765#endif
766
767 if (from_queue) {
768#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
769 /*
770 * tagged queueing - allocate a new tag to this command
771 */
772 if (SCpnt->device->simple_tags) {
773 SCpnt->device->current_tag += 1;
774 if (SCpnt->device->current_tag == 0)
775 SCpnt->device->current_tag = 1;
776 SCpnt->tag = SCpnt->device->current_tag;
777 } else
778#endif
779 set_bit(SCpnt->device->id * 8 + SCpnt->device->lun, host->busyluns);
780
781 host->stats.removes += 1;
782
783 switch (acornscsi_cmdtype(SCpnt->cmnd[0])) {
784 case CMD_WRITE:
785 host->stats.writes += 1;
786 break;
787 case CMD_READ:
788 host->stats.reads += 1;
789 break;
790 case CMD_MISC:
791 host->stats.miscs += 1;
792 break;
793 }
794 }
795
796 return INTR_PROCESSING;
797}
798
799/*
ee0ca6ba 800 * Function: void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp, unsigned int result)
1da177e4
LT		 801 * Purpose : complete processing for command
802 * Params : host - interface that completed
803 * result - driver byte of result
804 */
ee0ca6ba
HK		 805static void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp,
806 unsigned int result)
1da177e4 807{
ee0ca6ba 808 struct scsi_cmnd *SCpnt = *SCpntp;
1da177e4
LT		 809
810 /* clean up */
811 sbic_arm_write(host->scsi.io_port, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP);
812
813 host->stats.fins += 1;
814
815 if (SCpnt) {
816 *SCpntp = NULL;
817
818 acornscsi_dma_cleanup(host);
819
820 SCpnt->result = result << 16 | host->scsi.SCp.Message << 8 | host->scsi.SCp.Status;
821
822 /*
823 * In theory, this should not happen. In practice, it seems to.
824 * Only trigger an error if the device attempts to report all happy
825 * but with untransferred buffers... If we don't do something, then
826 * data loss will occur. Should we check SCpnt->underflow here?
827 * It doesn't appear to be set to something meaningful by the higher
828 * levels all the time.
829 */
830 if (result == DID_OK) {
831 int xfer_warn = 0;
832
833 if (SCpnt->underflow == 0) {
834 if (host->scsi.SCp.ptr &&
835 acornscsi_cmdtype(SCpnt->cmnd[0]) != CMD_MISC)
836 xfer_warn = 1;
837 } else {
838 if (host->scsi.SCp.scsi_xferred < SCpnt->underflow ||
839 host->scsi.SCp.scsi_xferred != host->dma.transferred)
840 xfer_warn = 1;
841 }
842
843 /* ANSI standard says: (SCSI-2 Rev 10c Sect 5.6.6)
844 * Targets which break data transfers into multiple
845 * connections shall end each successful connection
846 * (except possibly the last) with a SAVE DATA
847 * POINTER - DISCONNECT message sequence.
848 *
849 * This makes it difficult to ensure that a transfer has
850 * completed. If we reach the end of a transfer during
851 * the command, then we can only have finished the transfer.
852 * therefore, if we seem to have some data remaining, this
853 * is not a problem.
854 */
855 if (host->dma.xfer_done)
856 xfer_warn = 0;
857
858 if (xfer_warn) {
859 switch (status_byte(SCpnt->result)) {
860 case CHECK_CONDITION:
861 case COMMAND_TERMINATED:
862 case BUSY:
863 case QUEUE_FULL:
864 case RESERVATION_CONFLICT:
865 break;
866
867 default:
868 printk(KERN_ERR "scsi%d.H: incomplete data transfer detected: result=%08X command=",
869 host->host->host_no, SCpnt->result);
db9dff36 870 __scsi_print_command(SCpnt->cmnd);
1da177e4
LT		 871 acornscsi_dumpdma(host, "done");
872 acornscsi_dumplog(host, SCpnt->device->id);
873 SCpnt->result &= 0xffff;
874 SCpnt->result |= DID_ERROR << 16;
875 }
876 }
877 }
878
879 if (!SCpnt->scsi_done)
880 panic("scsi%d.H: null scsi_done function in acornscsi_done", host->host->host_no);
881
882 clear_bit(SCpnt->device->id * 8 + SCpnt->device->lun, host->busyluns);
883
884 SCpnt->scsi_done(SCpnt);
885 } else
886 printk("scsi%d: null command in acornscsi_done", host->host->host_no);
887
888 host->scsi.phase = PHASE_IDLE;
889}
890
891/* ====================================================================================
892 * DMA routines
893 */
894/*
895 * Purpose : update SCSI Data Pointer
896 * Notes : this will only be one SG entry or less
897 */
898static
0a04137e 899void acornscsi_data_updateptr(AS_Host *host, struct scsi_pointer *SCp, unsigned int length)
1da177e4
LT		 900{
901 SCp->ptr += length;
902 SCp->this_residual -= length;
903
904 if (SCp->this_residual == 0 && next_SCp(SCp) == 0)
905 host->dma.xfer_done = 1;
906}
907
908/*
909 * Prototype: void acornscsi_data_read(AS_Host *host, char *ptr,
910 * unsigned int start_addr, unsigned int length)
911 * Purpose : read data from DMA RAM
912 * Params : host - host to transfer from
913 * ptr - DRAM address
914 * start_addr - host mem address
915 * length - number of bytes to transfer
916 * Notes : this will only be one SG entry or less
917 */
918static
919void acornscsi_data_read(AS_Host *host, char *ptr,
920 unsigned int start_addr, unsigned int length)
921{
922 extern void __acornscsi_in(int port, char *buf, int len);
923 unsigned int page, offset, len = length;
924
925 page = (start_addr >> 12);
926 offset = start_addr & ((1 << 12) - 1);
927
928 outb((page & 0x3f) | host->card.page_reg, host->card.io_page);
929
930 while (len > 0) {
931 unsigned int this_len;
932
933 if (len + offset > (1 << 12))
934 this_len = (1 << 12) - offset;
935 else
936 this_len = len;
937
938 __acornscsi_in(host->card.io_ram + (offset << 1), ptr, this_len);
939
940 offset += this_len;
941 ptr += this_len;
942 len -= this_len;
943
944 if (offset == (1 << 12)) {
945 offset = 0;
946 page ++;
947 outb((page & 0x3f) | host->card.page_reg, host->card.io_page);
948 }
949 }
950 outb(host->card.page_reg, host->card.io_page);
951}
952
953/*
954 * Prototype: void acornscsi_data_write(AS_Host *host, char *ptr,
955 * unsigned int start_addr, unsigned int length)
956 * Purpose : write data to DMA RAM
957 * Params : host - host to transfer from
958 * ptr - DRAM address
959 * start_addr - host mem address
960 * length - number of bytes to transfer
961 * Notes : this will only be one SG entry or less
962 */
963static
964void acornscsi_data_write(AS_Host *host, char *ptr,
965 unsigned int start_addr, unsigned int length)
966{
967 extern void __acornscsi_out(int port, char *buf, int len);
968 unsigned int page, offset, len = length;
969
970 page = (start_addr >> 12);
971 offset = start_addr & ((1 << 12) - 1);
972
973 outb((page & 0x3f) | host->card.page_reg, host->card.io_page);
974
975 while (len > 0) {
976 unsigned int this_len;
977
978 if (len + offset > (1 << 12))
979 this_len = (1 << 12) - offset;
980 else
981 this_len = len;
982
983 __acornscsi_out(host->card.io_ram + (offset << 1), ptr, this_len);
984
985 offset += this_len;
986 ptr += this_len;
987 len -= this_len;
988
989 if (offset == (1 << 12)) {
990 offset = 0;
991 page ++;
992 outb((page & 0x3f) | host->card.page_reg, host->card.io_page);
993 }
994 }
995 outb(host->card.page_reg, host->card.io_page);
996}
997
998/* =========================================================================================
999 * On-board DMA routines
1000 */
1001#ifdef USE_DMAC
1002/*
1003 * Prototype: void acornscsi_dmastop(AS_Host *host)
1004 * Purpose : stop all DMA
1005 * Params : host - host on which to stop DMA
1006 * Notes : This is called when leaving DATA IN/OUT phase,
1007 * or when interface is RESET
1008 */
1009static inline
1010void acornscsi_dma_stop(AS_Host *host)
1011{
1012 dmac_write(host->dma.io_port, DMAC_MASKREG, MASK_ON);
1013 dmac_clearintr(host->dma.io_intr_clear);
1014
1015#if (DEBUG & DEBUG_DMA)
1016 DBG(host->SCpnt, acornscsi_dumpdma(host, "stop"));
1017#endif
1018}
1019
1020/*
1021 * Function: void acornscsi_dma_setup(AS_Host *host, dmadir_t direction)
1022 * Purpose : setup DMA controller for data transfer
1023 * Params : host - host to setup
1024 * direction - data transfer direction
1025 * Notes : This is called when entering DATA I/O phase, not
1026 * while we're in a DATA I/O phase
1027 */
1028static
1029void acornscsi_dma_setup(AS_Host *host, dmadir_t direction)
1030{
1031 unsigned int address, length, mode;
1032
1033 host->dma.direction = direction;
1034
1035 dmac_write(host->dma.io_port, DMAC_MASKREG, MASK_ON);
1036
1037 if (direction == DMA_OUT) {
1038#if (DEBUG & DEBUG_NO_WRITE)
1039 if (NO_WRITE & (1 << host->SCpnt->device->id)) {
1040 printk(KERN_CRIT "scsi%d.%c: I can't handle DMA_OUT!\n",
1041 host->host->host_no, acornscsi_target(host));
1042 return;
1043 }
1044#endif
1045 mode = DMAC_WRITE;
1046 } else
1047 mode = DMAC_READ;
1048
1049 /*
1050 * Allocate some buffer space, limited to half the buffer size
1051 */
1052 length = min_t(unsigned int, host->scsi.SCp.this_residual, DMAC_BUFFER_SIZE / 2);
1053 if (length) {
1054 host->dma.start_addr = address = host->dma.free_addr;
1055 host->dma.free_addr = (host->dma.free_addr + length) &
1056 (DMAC_BUFFER_SIZE - 1);
1057
1058 /*
1059 * Transfer data to DMA memory
1060 */
1061 if (direction == DMA_OUT)
1062 acornscsi_data_write(host, host->scsi.SCp.ptr, host->dma.start_addr,
1063 length);
1064
1065 length -= 1;
1066 dmac_write(host->dma.io_port, DMAC_TXCNTLO, length);
1067 dmac_write(host->dma.io_port, DMAC_TXCNTHI, length >> 8);
1068 dmac_write(host->dma.io_port, DMAC_TXADRLO, address);
1069 dmac_write(host->dma.io_port, DMAC_TXADRMD, address >> 8);
1070 dmac_write(host->dma.io_port, DMAC_TXADRHI, 0);
1071 dmac_write(host->dma.io_port, DMAC_MODECON, mode);
1072 dmac_write(host->dma.io_port, DMAC_MASKREG, MASK_OFF);
1073
1074#if (DEBUG & DEBUG_DMA)
1075 DBG(host->SCpnt, acornscsi_dumpdma(host, "strt"));
1076#endif
1077 host->dma.xfer_setup = 1;
1078 }
1079}
1080
1081/*
1082 * Function: void acornscsi_dma_cleanup(AS_Host *host)
1083 * Purpose : ensure that all DMA transfers are up-to-date & host->scsi.SCp is correct
1084 * Params : host - host to finish
1085 * Notes : This is called when a command is:
1086 * terminating, RESTORE_POINTERS, SAVE_POINTERS, DISCONECT
1087 * : This must not return until all transfers are completed.
1088 */
1089static
1090void acornscsi_dma_cleanup(AS_Host *host)
1091{
1092 dmac_write(host->dma.io_port, DMAC_MASKREG, MASK_ON);
1093 dmac_clearintr(host->dma.io_intr_clear);
1094
1095 /*
1096 * Check for a pending transfer
1097 */
1098 if (host->dma.xfer_required) {
1099 host->dma.xfer_required = 0;
1100 if (host->dma.direction == DMA_IN)
1101 acornscsi_data_read(host, host->dma.xfer_ptr,
1102 host->dma.xfer_start, host->dma.xfer_length);
1103 }
1104
1105 /*
1106 * Has a transfer been setup?
1107 */
1108 if (host->dma.xfer_setup) {
1109 unsigned int transferred;
1110
1111 host->dma.xfer_setup = 0;
1112
1113#if (DEBUG & DEBUG_DMA)
1114 DBG(host->SCpnt, acornscsi_dumpdma(host, "cupi"));
1115#endif
1116
1117 /*
1118 * Calculate number of bytes transferred from DMA.
1119 */
1120 transferred = dmac_address(host->dma.io_port) - host->dma.start_addr;
1121 host->dma.transferred += transferred;
1122
1123 if (host->dma.direction == DMA_IN)
1124 acornscsi_data_read(host, host->scsi.SCp.ptr,
1125 host->dma.start_addr, transferred);
1126
1127 /*
1128 * Update SCSI pointers
1129 */
1130 acornscsi_data_updateptr(host, &host->scsi.SCp, transferred);
1131#if (DEBUG & DEBUG_DMA)
1132 DBG(host->SCpnt, acornscsi_dumpdma(host, "cupo"));
1133#endif
1134 }
1135}
1136
1137/*
1138 * Function: void acornscsi_dmacintr(AS_Host *host)
1139 * Purpose : handle interrupts from DMAC device
1140 * Params : host - host to process
1141 * Notes : If reading, we schedule the read to main memory &
1142 * allow the transfer to continue.
1143 * : If writing, we fill the onboard DMA memory from main
1144 * memory.
1145 * : Called whenever DMAC finished it's current transfer.
1146 */
1147static
1148void acornscsi_dma_intr(AS_Host *host)
1149{
1150 unsigned int address, length, transferred;
1151
1152#if (DEBUG & DEBUG_DMA)
1153 DBG(host->SCpnt, acornscsi_dumpdma(host, "inti"));
1154#endif
1155
1156 dmac_write(host->dma.io_port, DMAC_MASKREG, MASK_ON);
1157 dmac_clearintr(host->dma.io_intr_clear);
1158
1159 /*
1160 * Calculate amount transferred via DMA
1161 */
1162 transferred = dmac_address(host->dma.io_port) - host->dma.start_addr;
1163 host->dma.transferred += transferred;
1164
1165 /*
1166 * Schedule DMA transfer off board
1167 */
1168 if (host->dma.direction == DMA_IN) {
1169 host->dma.xfer_start = host->dma.start_addr;
1170 host->dma.xfer_length = transferred;
1171 host->dma.xfer_ptr = host->scsi.SCp.ptr;
1172 host->dma.xfer_required = 1;
1173 }
1174
1175 acornscsi_data_updateptr(host, &host->scsi.SCp, transferred);
1176
1177 /*
1178 * Allocate some buffer space, limited to half the on-board RAM size
1179 */
1180 length = min_t(unsigned int, host->scsi.SCp.this_residual, DMAC_BUFFER_SIZE / 2);
1181 if (length) {
1182 host->dma.start_addr = address = host->dma.free_addr;
1183 host->dma.free_addr = (host->dma.free_addr + length) &
1184 (DMAC_BUFFER_SIZE - 1);
1185
1186 /*
1187 * Transfer data to DMA memory
1188 */
1189 if (host->dma.direction == DMA_OUT)
1190 acornscsi_data_write(host, host->scsi.SCp.ptr, host->dma.start_addr,
1191 length);
1192
1193 length -= 1;
1194 dmac_write(host->dma.io_port, DMAC_TXCNTLO, length);
1195 dmac_write(host->dma.io_port, DMAC_TXCNTHI, length >> 8);
1196 dmac_write(host->dma.io_port, DMAC_TXADRLO, address);
1197 dmac_write(host->dma.io_port, DMAC_TXADRMD, address >> 8);
1198 dmac_write(host->dma.io_port, DMAC_TXADRHI, 0);
1199 dmac_write(host->dma.io_port, DMAC_MASKREG, MASK_OFF);
1200
1201#if (DEBUG & DEBUG_DMA)
1202 DBG(host->SCpnt, acornscsi_dumpdma(host, "into"));
1203#endif
1204 } else {
1205 host->dma.xfer_setup = 0;
1206#if 0
1207 /*
1208 * If the interface still wants more, then this is an error.
1209 * We give it another byte, but we also attempt to raise an
1210 * attention condition. We continue giving one byte until
1211 * the device recognises the attention.
1212 */
1213 if (dmac_read(host->dma.io_port, DMAC_STATUS) & STATUS_RQ0) {
1214 acornscsi_abortcmd(host, host->SCpnt->tag);
1215
1216 dmac_write(host->dma.io_port, DMAC_TXCNTLO, 0);
1217 dmac_write(host->dma.io_port, DMAC_TXCNTHI, 0);
1218 dmac_write(host->dma.io_port, DMAC_TXADRLO, 0);
1219 dmac_write(host->dma.io_port, DMAC_TXADRMD, 0);
1220 dmac_write(host->dma.io_port, DMAC_TXADRHI, 0);
1221 dmac_write(host->dma.io_port, DMAC_MASKREG, MASK_OFF);
1222 }
1223#endif
1224 }
1225}
1226
1227/*
1228 * Function: void acornscsi_dma_xfer(AS_Host *host)
1229 * Purpose : transfer data between AcornSCSI and memory
1230 * Params : host - host to process
1231 */
1232static
1233void acornscsi_dma_xfer(AS_Host *host)
1234{
1235 host->dma.xfer_required = 0;
1236
1237 if (host->dma.direction == DMA_IN)
1238 acornscsi_data_read(host, host->dma.xfer_ptr,
1239 host->dma.xfer_start, host->dma.xfer_length);
1240}
1241
1242/*
1243 * Function: void acornscsi_dma_adjust(AS_Host *host)
1244 * Purpose : adjust DMA pointers & count for bytes transferred to
1245 * SBIC but not SCSI bus.
1246 * Params : host - host to adjust DMA count for
1247 */
1248static
1249void acornscsi_dma_adjust(AS_Host *host)
1250{
1251 if (host->dma.xfer_setup) {
1252 signed long transferred;
1253#if (DEBUG & (DEBUG_DMA|DEBUG_WRITE))
1254 DBG(host->SCpnt, acornscsi_dumpdma(host, "adji"));
1255#endif
1256 /*
1257 * Calculate correct DMA address - DMA is ahead of SCSI bus while
1258 * writing.
1259 * host->scsi.SCp.scsi_xferred is the number of bytes
1260 * actually transferred to/from the SCSI bus.
1261 * host->dma.transferred is the number of bytes transferred
1262 * over DMA since host->dma.start_addr was last set.
1263 *
1264 * real_dma_addr = host->dma.start_addr + host->scsi.SCp.scsi_xferred
1265 * - host->dma.transferred
1266 */
1267 transferred = host->scsi.SCp.scsi_xferred - host->dma.transferred;
1268 if (transferred < 0)
1269 printk("scsi%d.%c: Ack! DMA write correction %ld < 0!\n",
1270 host->host->host_no, acornscsi_target(host), transferred);
1271 else if (transferred == 0)
1272 host->dma.xfer_setup = 0;
1273 else {
1274 transferred += host->dma.start_addr;
1275 dmac_write(host->dma.io_port, DMAC_TXADRLO, transferred);
1276 dmac_write(host->dma.io_port, DMAC_TXADRMD, transferred >> 8);
1277 dmac_write(host->dma.io_port, DMAC_TXADRHI, transferred >> 16);
1278#if (DEBUG & (DEBUG_DMA|DEBUG_WRITE))
1279 DBG(host->SCpnt, acornscsi_dumpdma(host, "adjo"));
1280#endif
1281 }
1282 }
1283}
1284#endif
1285
1286/* =========================================================================================
1287 * Data I/O
1288 */
1289static int
1290acornscsi_write_pio(AS_Host *host, char *bytes, int *ptr, int len, unsigned int max_timeout)
1291{
1292 unsigned int asr, timeout = max_timeout;
1293 int my_ptr = *ptr;
1294
1295 while (my_ptr < len) {
1296 asr = sbic_arm_read(host->scsi.io_port, SBIC_ASR);
1297
1298 if (asr & ASR_DBR) {
1299 timeout = max_timeout;
1300
1301 sbic_arm_write(host->scsi.io_port, SBIC_DATA, bytes[my_ptr++]);
1302 } else if (asr & ASR_INT)
1303 break;
1304 else if (--timeout == 0)
1305 break;
1306 udelay(1);
1307 }
1308
1309 *ptr = my_ptr;
1310
1311 return (timeout == 0) ? -1 : 0;
1312}
1313
1314/*
1315 * Function: void acornscsi_sendcommand(AS_Host *host)
1316 * Purpose : send a command to a target
1317 * Params : host - host which is connected to target
1318 */
1319static void
1320acornscsi_sendcommand(AS_Host *host)
1321{
ee0ca6ba 1322 struct scsi_cmnd *SCpnt = host->SCpnt;
1da177e4
LT		 1323
1324 sbic_arm_write(host->scsi.io_port, SBIC_TRANSCNTH, 0);
1325 sbic_arm_writenext(host->scsi.io_port, 0);
1326 sbic_arm_writenext(host->scsi.io_port, SCpnt->cmd_len - host->scsi.SCp.sent_command);
1327
1328 acornscsi_sbic_issuecmd(host, CMND_XFERINFO);
1329
1330 if (acornscsi_write_pio(host, SCpnt->cmnd,
1331 (int *)&host->scsi.SCp.sent_command, SCpnt->cmd_len, 1000000))
1332 printk("scsi%d: timeout while sending command\n", host->host->host_no);
1333
1334 host->scsi.phase = PHASE_COMMAND;
1335}
1336
1337static
1338void acornscsi_sendmessage(AS_Host *host)
1339{
1340 unsigned int message_length = msgqueue_msglength(&host->scsi.msgs);
1341 unsigned int msgnr;
1342 struct message *msg;
1343
1344#if (DEBUG & DEBUG_MESSAGES)
1345 printk("scsi%d.%c: sending message ",
1346 host->host->host_no, acornscsi_target(host));
1347#endif
1348
1349 switch (message_length) {
1350 case 0:
1351 acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT);
1352
1353 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "sending message 1");
1354
1355 sbic_arm_write(host->scsi.io_port, SBIC_DATA, NOP);
1356
1357 host->scsi.last_message = NOP;
1358#if (DEBUG & DEBUG_MESSAGES)
1359 printk("NOP");
1360#endif
1361 break;
1362
1363 case 1:
1364 acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT);
1365 msg = msgqueue_getmsg(&host->scsi.msgs, 0);
1366
1367 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "sending message 2");
1368
1369 sbic_arm_write(host->scsi.io_port, SBIC_DATA, msg->msg[0]);
1370
1371 host->scsi.last_message = msg->msg[0];
1372#if (DEBUG & DEBUG_MESSAGES)
1abfd370 1373 spi_print_msg(msg->msg);
1da177e4
LT		 1374#endif
1375 break;
1376
1377 default:
1378 /*
1379 * ANSI standard says: (SCSI-2 Rev 10c Sect 5.6.14)
1380 * 'When a target sends this (MESSAGE_REJECT) message, it
1381 * shall change to MESSAGE IN phase and send this message
1382 * prior to requesting additional message bytes from the
1383 * initiator. This provides an interlock so that the
1384 * initiator can determine which message byte is rejected.
1385 */
1386 sbic_arm_write(host->scsi.io_port, SBIC_TRANSCNTH, 0);
1387 sbic_arm_writenext(host->scsi.io_port, 0);
1388 sbic_arm_writenext(host->scsi.io_port, message_length);
1389 acornscsi_sbic_issuecmd(host, CMND_XFERINFO);
1390
1391 msgnr = 0;
1392 while ((msg = msgqueue_getmsg(&host->scsi.msgs, msgnr++)) != NULL) {
1393 unsigned int i;
1394#if (DEBUG & DEBUG_MESSAGES)
1abfd370 1395 spi_print_msg(msg);
1da177e4
LT		 1396#endif
1397 i = 0;
1398 if (acornscsi_write_pio(host, msg->msg, &i, msg->length, 1000000))
1399 printk("scsi%d: timeout while sending message\n", host->host->host_no);
1400
1401 host->scsi.last_message = msg->msg[0];
1402 if (msg->msg[0] == EXTENDED_MESSAGE)
1403 host->scsi.last_message |= msg->msg[2] << 8;
1404
1405 if (i != msg->length)
1406 break;
1407 }
1408 break;
1409 }
1410#if (DEBUG & DEBUG_MESSAGES)
1411 printk("\n");
1412#endif
1413}
1414
1415/*
1416 * Function: void acornscsi_readstatusbyte(AS_Host *host)
1417 * Purpose : Read status byte from connected target
1418 * Params : host - host connected to target
1419 */
1420static
1421void acornscsi_readstatusbyte(AS_Host *host)
1422{
1423 acornscsi_sbic_issuecmd(host, CMND_XFERINFO|CMND_SBT);
1424 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "reading status byte");
1425 host->scsi.SCp.Status = sbic_arm_read(host->scsi.io_port, SBIC_DATA);
1426}
1427
1428/*
1429 * Function: unsigned char acornscsi_readmessagebyte(AS_Host *host)
1430 * Purpose : Read one message byte from connected target
1431 * Params : host - host connected to target
1432 */
1433static
1434unsigned char acornscsi_readmessagebyte(AS_Host *host)
1435{
1436 unsigned char message;
1437
1438 acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT);
1439
1440 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "for message byte");
1441
1442 message = sbic_arm_read(host->scsi.io_port, SBIC_DATA);
1443
1444 /* wait for MSGIN-XFER-PAUSED */
1445 acornscsi_sbic_wait(host, ASR_INT, ASR_INT, 1000, "for interrupt after message byte");
1446
1447 sbic_arm_read(host->scsi.io_port, SBIC_SSR);
1448
1449 return message;
1450}
1451
1452/*
1453 * Function: void acornscsi_message(AS_Host *host)
1454 * Purpose : Read complete message from connected target & action message
1455 * Params : host - host connected to target
1456 */
1457static
1458void acornscsi_message(AS_Host *host)
1459{
1460 unsigned char message[16];
1461 unsigned int msgidx = 0, msglen = 1;
1462
1463 do {
1464 message[msgidx] = acornscsi_readmessagebyte(host);
1465
1466 switch (msgidx) {
1467 case 0:
1468 if (message[0] == EXTENDED_MESSAGE ||
1469 (message[0] >= 0x20 && message[0] <= 0x2f))
1470 msglen = 2;
1471 break;
1472
1473 case 1:
1474 if (message[0] == EXTENDED_MESSAGE)
1475 msglen += message[msgidx];
1476 break;
1477 }
1478 msgidx += 1;
1479 if (msgidx < msglen) {
1480 acornscsi_sbic_issuecmd(host, CMND_NEGATEACK);
1481
1482 /* wait for next msg-in */
1483 acornscsi_sbic_wait(host, ASR_INT, ASR_INT, 1000, "for interrupt after negate ack");
1484 sbic_arm_read(host->scsi.io_port, SBIC_SSR);
1485 }
1486 } while (msgidx < msglen);
1487
1488#if (DEBUG & DEBUG_MESSAGES)
1489 printk("scsi%d.%c: message in: ",
1490 host->host->host_no, acornscsi_target(host));
1abfd370 1491 spi_print_msg(message);
1da177e4
LT		 1492 printk("\n");
1493#endif
1494
1495 if (host->scsi.phase == PHASE_RECONNECTED) {
1496 /*
1497 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.17)
1498 * 'Whenever a target reconnects to an initiator to continue
1499 * a tagged I/O process, the SIMPLE QUEUE TAG message shall
1500 * be sent immediately following the IDENTIFY message...'
1501 */
1502 if (message[0] == SIMPLE_QUEUE_TAG)
1503 host->scsi.reconnected.tag = message[1];
1504 if (acornscsi_reconnect_finish(host))
1505 host->scsi.phase = PHASE_MSGIN;
1506 }
1507
1508 switch (message[0]) {
1509 case ABORT:
1510 case ABORT_TAG:
1511 case COMMAND_COMPLETE:
1512 if (host->scsi.phase != PHASE_STATUSIN) {
1513 printk(KERN_ERR "scsi%d.%c: command complete following non-status in phase?\n",
1514 host->host->host_no, acornscsi_target(host));
1515 acornscsi_dumplog(host, host->SCpnt->device->id);
1516 }
1517 host->scsi.phase = PHASE_DONE;
1518 host->scsi.SCp.Message = message[0];
1519 break;
1520
1521 case SAVE_POINTERS:
1522 /*
1523 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.20)
1524 * 'The SAVE DATA POINTER message is sent from a target to
1525 * direct the initiator to copy the active data pointer to
1526 * the saved data pointer for the current I/O process.
1527 */
1528 acornscsi_dma_cleanup(host);
1529 host->SCpnt->SCp = host->scsi.SCp;
1530 host->SCpnt->SCp.sent_command = 0;
1531 host->scsi.phase = PHASE_MSGIN;
1532 break;
1533
1534 case RESTORE_POINTERS:
1535 /*
1536 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.19)
1537 * 'The RESTORE POINTERS message is sent from a target to
1538 * direct the initiator to copy the most recently saved
1539 * command, data, and status pointers for the I/O process
1540 * to the corresponding active pointers. The command and
1541 * status pointers shall be restored to the beginning of
1542 * the present command and status areas.'
1543 */
1544 acornscsi_dma_cleanup(host);
1545 host->scsi.SCp = host->SCpnt->SCp;
1546 host->scsi.phase = PHASE_MSGIN;
1547 break;
1548
1549 case DISCONNECT:
1550 /*
1551 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 6.4.2)
1552 * 'On those occasions when an error or exception condition occurs
1553 * and the target elects to repeat the information transfer, the
1554 * target may repeat the transfer either issuing a RESTORE POINTERS
1555 * message or by disconnecting without issuing a SAVE POINTERS
1556 * message. When reconnection is completed, the most recent
1557 * saved pointer values are restored.'
1558 */
1559 acornscsi_dma_cleanup(host);
1560 host->scsi.phase = PHASE_DISCONNECT;
1561 break;
1562
1563 case MESSAGE_REJECT:
1564#if 0 /* this isn't needed any more */
1565 /*
1566 * If we were negociating sync transfer, we don't yet know if
1567 * this REJECT is for the sync transfer or for the tagged queue/wide
1568 * transfer. Re-initiate sync transfer negociation now, and if
1569 * we got a REJECT in response to SDTR, then it'll be set to DONE.
1570 */
1571 if (host->device[host->SCpnt->device->id].sync_state == SYNC_SENT_REQUEST)
1572 host->device[host->SCpnt->device->id].sync_state = SYNC_NEGOCIATE;
1573#endif
1574
1575 /*
1576 * If we have any messages waiting to go out, then assert ATN now
1577 */
1578 if (msgqueue_msglength(&host->scsi.msgs))
1579 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN);
1580
1581 switch (host->scsi.last_message) {
1582#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
1583 case HEAD_OF_QUEUE_TAG:
1584 case ORDERED_QUEUE_TAG:
1585 case SIMPLE_QUEUE_TAG:
1586 /*
1587 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.17)
1588 * If a target does not implement tagged queuing and a queue tag
1589 * message is received, it shall respond with a MESSAGE REJECT
1590 * message and accept the I/O process as if it were untagged.
1591 */
1592 printk(KERN_NOTICE "scsi%d.%c: disabling tagged queueing\n",
1593 host->host->host_no, acornscsi_target(host));
1594 host->SCpnt->device->simple_tags = 0;
1595 set_bit(host->SCpnt->device->id * 8 + host->SCpnt->device->lun, host->busyluns);
1596 break;
1597#endif
1598 case EXTENDED_MESSAGE | (EXTENDED_SDTR << 8):
1599 /*
1600 * Target can't handle synchronous transfers
1601 */
1602 printk(KERN_NOTICE "scsi%d.%c: Using asynchronous transfer\n",
1603 host->host->host_no, acornscsi_target(host));
1604 host->device[host->SCpnt->device->id].sync_xfer = SYNCHTRANSFER_2DBA;
1605 host->device[host->SCpnt->device->id].sync_state = SYNC_ASYNCHRONOUS;
1606 sbic_arm_write(host->scsi.io_port, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer);
1607 break;
1608
1609 default:
1610 break;
1611 }
1612 break;
1613
1614 case QUEUE_FULL:
1615 /* TODO: target queue is full */
1616 break;
1617
1618 case SIMPLE_QUEUE_TAG:
1619 /* tag queue reconnect... message[1] = queue tag. Print something to indicate something happened! */
1620 printk("scsi%d.%c: reconnect queue tag %02X\n",
1621 host->host->host_no, acornscsi_target(host),
1622 message[1]);
1623 break;
1624
1625 case EXTENDED_MESSAGE:
1626 switch (message[2]) {
1627#ifdef CONFIG_SCSI_ACORNSCSI_SYNC
1628 case EXTENDED_SDTR:
1629 if (host->device[host->SCpnt->device->id].sync_state == SYNC_SENT_REQUEST) {
1630 /*
1631 * We requested synchronous transfers. This isn't quite right...
1632 * We can only say if this succeeded if we proceed on to execute the
1633 * command from this message. If we get a MESSAGE PARITY ERROR,
1634 * and the target retries fail, then we fallback to asynchronous mode
1635 */
1636 host->device[host->SCpnt->device->id].sync_state = SYNC_COMPLETED;
1637 printk(KERN_NOTICE "scsi%d.%c: Using synchronous transfer, offset %d, %d ns\n",
1638 host->host->host_no, acornscsi_target(host),
1639 message[4], message[3] * 4);
1640 host->device[host->SCpnt->device->id].sync_xfer =
1641 calc_sync_xfer(message[3] * 4, message[4]);
1642 } else {
1643 unsigned char period, length;
1644 /*
1645 * Target requested synchronous transfers. The agreement is only
1646 * to be in operation AFTER the target leaves message out phase.
1647 */
1648 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN);
1649 period = max_t(unsigned int, message[3], sdtr_period / 4);
1650 length = min_t(unsigned int, message[4], sdtr_size);
1651 msgqueue_addmsg(&host->scsi.msgs, 5, EXTENDED_MESSAGE, 3,
1652 EXTENDED_SDTR, period, length);
1653 host->device[host->SCpnt->device->id].sync_xfer =
1654 calc_sync_xfer(period * 4, length);
1655 }
1656 sbic_arm_write(host->scsi.io_port, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer);
1657 break;
1658#else
1659 /* We do not accept synchronous transfers. Respond with a
1660 * MESSAGE_REJECT.
1661 */
1662#endif
1663
1664 case EXTENDED_WDTR:
1665 /* The WD33C93A is only 8-bit. We respond with a MESSAGE_REJECT
1666 * to a wide data transfer request.
1667 */
1668 default:
1669 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN);
1670 msgqueue_flush(&host->scsi.msgs);
1671 msgqueue_addmsg(&host->scsi.msgs, 1, MESSAGE_REJECT);
1672 break;
1673 }
1674 break;
1675
1676#ifdef CONFIG_SCSI_ACORNSCSI_LINK
1677 case LINKED_CMD_COMPLETE:
1678 case LINKED_FLG_CMD_COMPLETE:
1679 /*
1680 * We don't support linked commands yet
1681 */
1682 if (0) {
1683#if (DEBUG & DEBUG_LINK)
1684 printk("scsi%d.%c: lun %d tag %d linked command complete\n",
1685 host->host->host_no, acornscsi_target(host), host->SCpnt->tag);
1686#endif
1687 /*
1688 * A linked command should only terminate with one of these messages
1689 * if there are more linked commands available.
1690 */
1691 if (!host->SCpnt->next_link) {
1692 printk(KERN_WARNING "scsi%d.%c: lun %d tag %d linked command complete, but no next_link\n",
1693 instance->host_no, acornscsi_target(host), host->SCpnt->tag);
1694 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN);
1695 msgqueue_addmsg(&host->scsi.msgs, 1, ABORT);
1696 } else {
ee0ca6ba 1697 struct scsi_cmnd *SCpnt = host->SCpnt;
1da177e4
LT		 1698
1699 acornscsi_dma_cleanup(host);
1700
1701 host->SCpnt = host->SCpnt->next_link;
1702 host->SCpnt->tag = SCpnt->tag;
1703 SCpnt->result = DID_OK | host->scsi.SCp.Message << 8 | host->Scsi.SCp.Status;
1704 SCpnt->done(SCpnt);
1705
1706 /* initialise host->SCpnt->SCp */
1707 }
1708 break;
1709 }
1710#endif
1711
1712 default: /* reject message */
1713 printk(KERN_ERR "scsi%d.%c: unrecognised message %02X, rejecting\n",
1714 host->host->host_no, acornscsi_target(host),
1715 message[0]);
1716 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN);
1717 msgqueue_flush(&host->scsi.msgs);
1718 msgqueue_addmsg(&host->scsi.msgs, 1, MESSAGE_REJECT);
1719 host->scsi.phase = PHASE_MSGIN;
1720 break;
1721 }
1722 acornscsi_sbic_issuecmd(host, CMND_NEGATEACK);
1723}
1724
1725/*
1726 * Function: int acornscsi_buildmessages(AS_Host *host)
1727 * Purpose : build the connection messages for a host
1728 * Params : host - host to add messages to
1729 */
1730static
1731void acornscsi_buildmessages(AS_Host *host)
1732{
1733#if 0
1734 /* does the device need resetting? */
1735 if (cmd_reset) {
1736 msgqueue_addmsg(&host->scsi.msgs, 1, BUS_DEVICE_RESET);
1737 return;
1738 }
1739#endif
1740
1741 msgqueue_addmsg(&host->scsi.msgs, 1,
1742 IDENTIFY(host->device[host->SCpnt->device->id].disconnect_ok,
1743 host->SCpnt->device->lun));
1744
1745#if 0
1746 /* does the device need the current command aborted */
1747 if (cmd_aborted) {
1748 acornscsi_abortcmd(host->SCpnt->tag);
1749 return;
1750 }
1751#endif
1752
1753#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
1754 if (host->SCpnt->tag) {
1755 unsigned int tag_type;
1756
1757 if (host->SCpnt->cmnd[0] == REQUEST_SENSE ||
1758 host->SCpnt->cmnd[0] == TEST_UNIT_READY ||
1759 host->SCpnt->cmnd[0] == INQUIRY)
1760 tag_type = HEAD_OF_QUEUE_TAG;
1761 else
1762 tag_type = SIMPLE_QUEUE_TAG;
1763 msgqueue_addmsg(&host->scsi.msgs, 2, tag_type, host->SCpnt->tag);
1764 }
1765#endif
1766
1767#ifdef CONFIG_SCSI_ACORNSCSI_SYNC
1768 if (host->device[host->SCpnt->device->id].sync_state == SYNC_NEGOCIATE) {
1769 host->device[host->SCpnt->device->id].sync_state = SYNC_SENT_REQUEST;
1770 msgqueue_addmsg(&host->scsi.msgs, 5,
1771 EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
1772 sdtr_period / 4, sdtr_size);
1773 }
1774#endif
1775}
1776
1777/*
1778 * Function: int acornscsi_starttransfer(AS_Host *host)
1779 * Purpose : transfer data to/from connected target
1780 * Params : host - host to which target is connected
1781 * Returns : 0 if failure
1782 */
1783static
1784int acornscsi_starttransfer(AS_Host *host)
1785{
1786 int residual;
1787
1788 if (!host->scsi.SCp.ptr /*&& host->scsi.SCp.this_residual*/) {
1789 printk(KERN_ERR "scsi%d.%c: null buffer passed to acornscsi_starttransfer\n",
1790 host->host->host_no, acornscsi_target(host));
1791 return 0;
1792 }
1793
1794 residual = host->SCpnt->request_bufflen - host->scsi.SCp.scsi_xferred;
1795
1796 sbic_arm_write(host->scsi.io_port, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer);
1797 sbic_arm_writenext(host->scsi.io_port, residual >> 16);
1798 sbic_arm_writenext(host->scsi.io_port, residual >> 8);
1799 sbic_arm_writenext(host->scsi.io_port, residual);
1800 acornscsi_sbic_issuecmd(host, CMND_XFERINFO);
1801 return 1;
1802}
1803
1804/* =========================================================================================
1805 * Connection & Disconnection
1806 */
1807/*
1808 * Function : acornscsi_reconnect(AS_Host *host)
1809 * Purpose : reconnect a previously disconnected command
1810 * Params : host - host specific data
1811 * Remarks : SCSI spec says:
1812 * 'The set of active pointers is restored from the set
1813 * of saved pointers upon reconnection of the I/O process'
1814 */
1815static
1816int acornscsi_reconnect(AS_Host *host)
1817{
1818 unsigned int target, lun, ok = 0;
1819
1820 target = sbic_arm_read(host->scsi.io_port, SBIC_SOURCEID);
1821
1822 if (!(target & 8))
1823 printk(KERN_ERR "scsi%d: invalid source id after reselection "
1824 "- device fault?\n",
1825 host->host->host_no);
1826
1827 target &= 7;
1828
1829 if (host->SCpnt && !host->scsi.disconnectable) {
1830 printk(KERN_ERR "scsi%d.%d: reconnected while command in "
1831 "progress to target %d?\n",
1832 host->host->host_no, target, host->SCpnt->device->id);
1833 host->SCpnt = NULL;
1834 }
1835
1836 lun = sbic_arm_read(host->scsi.io_port, SBIC_DATA) & 7;
1837
1838 host->scsi.reconnected.target = target;
1839 host->scsi.reconnected.lun = lun;
1840 host->scsi.reconnected.tag = 0;
1841
1842 if (host->scsi.disconnectable && host->SCpnt &&
1843 host->SCpnt->device->id == target && host->SCpnt->device->lun == lun)
1844 ok = 1;
1845
1846 if (!ok && queue_probetgtlun(&host->queues.disconnected, target, lun))
1847 ok = 1;
1848
1849 ADD_STATUS(target, 0x81, host->scsi.phase, 0);
1850
1851 if (ok) {
1852 host->scsi.phase = PHASE_RECONNECTED;
1853 } else {
1854 /* this doesn't seem to work */
1855 printk(KERN_ERR "scsi%d.%c: reselected with no command "
1856 "to reconnect with\n",
1857 host->host->host_no, '0' + target);
1858 acornscsi_dumplog(host, target);
1859 acornscsi_abortcmd(host, 0);
1860 if (host->SCpnt) {
1861 queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt);
1862 host->SCpnt = NULL;
1863 }
1864 }
1865 acornscsi_sbic_issuecmd(host, CMND_NEGATEACK);
1866 return !ok;
1867}
1868
1869/*
1870 * Function: int acornscsi_reconect_finish(AS_Host *host)
1871 * Purpose : finish reconnecting a command
1872 * Params : host - host to complete
1873 * Returns : 0 if failed
1874 */
1875static
1876int acornscsi_reconnect_finish(AS_Host *host)
1877{
1878 if (host->scsi.disconnectable && host->SCpnt) {
1879 host->scsi.disconnectable = 0;
1880 if (host->SCpnt->device->id == host->scsi.reconnected.target &&
1881 host->SCpnt->device->lun == host->scsi.reconnected.lun &&
1882 host->SCpnt->tag == host->scsi.reconnected.tag) {
1883#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
1884 DBG(host->SCpnt, printk("scsi%d.%c: reconnected",
1885 host->host->host_no, acornscsi_target(host)));
1886#endif
1887 } else {
1888 queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt);
1889#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
1890 DBG(host->SCpnt, printk("scsi%d.%c: had to move command "
1891 "to disconnected queue\n",
1892 host->host->host_no, acornscsi_target(host)));
1893#endif
1894 host->SCpnt = NULL;
1895 }
1896 }
1897 if (!host->SCpnt) {
1898 host->SCpnt = queue_remove_tgtluntag(&host->queues.disconnected,
1899 host->scsi.reconnected.target,
1900 host->scsi.reconnected.lun,
1901 host->scsi.reconnected.tag);
1902#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
1903 DBG(host->SCpnt, printk("scsi%d.%c: had to get command",
1904 host->host->host_no, acornscsi_target(host)));
1905#endif
1906 }
1907
1908 if (!host->SCpnt)
1909 acornscsi_abortcmd(host, host->scsi.reconnected.tag);
1910 else {
1911 /*
1912 * Restore data pointer from SAVED pointers.
1913 */
1914 host->scsi.SCp = host->SCpnt->SCp;
1915#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
1916 printk(", data pointers: [%p, %X]",
1917 host->scsi.SCp.ptr, host->scsi.SCp.this_residual);
1918#endif
1919 }
1920#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
1921 printk("\n");
1922#endif
1923
1924 host->dma.transferred = host->scsi.SCp.scsi_xferred;
1925
1926 return host->SCpnt != NULL;
1927}
1928
1929/*
1930 * Function: void acornscsi_disconnect_unexpected(AS_Host *host)
1931 * Purpose : handle an unexpected disconnect
1932 * Params : host - host on which disconnect occurred
1933 */
1934static
1935void acornscsi_disconnect_unexpected(AS_Host *host)
1936{
1937 printk(KERN_ERR "scsi%d.%c: unexpected disconnect\n",
1938 host->host->host_no, acornscsi_target(host));
1939#if (DEBUG & DEBUG_ABORT)
1940 acornscsi_dumplog(host, 8);
1941#endif
1942
1943 acornscsi_done(host, &host->SCpnt, DID_ERROR);
1944}
1945
1946/*
1947 * Function: void acornscsi_abortcmd(AS_host *host, unsigned char tag)
1948 * Purpose : abort a currently executing command
1949 * Params : host - host with connected command to abort
1950 * tag - tag to abort
1951 */
1952static
1953void acornscsi_abortcmd(AS_Host *host, unsigned char tag)
1954{
1955 host->scsi.phase = PHASE_ABORTED;
1956 sbic_arm_write(host->scsi.io_port, SBIC_CMND, CMND_ASSERTATN);
1957
1958 msgqueue_flush(&host->scsi.msgs);
1959#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
1960 if (tag)
1961 msgqueue_addmsg(&host->scsi.msgs, 2, ABORT_TAG, tag);
1962 else
1963#endif
1964 msgqueue_addmsg(&host->scsi.msgs, 1, ABORT);
1965}
1966
1967/* ==========================================================================================
1968 * Interrupt routines.
1969 */
1970/*
1971 * Function: int acornscsi_sbicintr(AS_Host *host)
1972 * Purpose : handle interrupts from SCSI device
1973 * Params : host - host to process
1974 * Returns : INTR_PROCESS if expecting another SBIC interrupt
1975 * INTR_IDLE if no interrupt
1976 * INTR_NEXT_COMMAND if we have finished processing the command
1977 */
1978static
1979intr_ret_t acornscsi_sbicintr(AS_Host *host, int in_irq)
1980{
1981 unsigned int asr, ssr;
1982
1983 asr = sbic_arm_read(host->scsi.io_port, SBIC_ASR);
1984 if (!(asr & ASR_INT))
1985 return INTR_IDLE;
1986
1987 ssr = sbic_arm_read(host->scsi.io_port, SBIC_SSR);
1988
1989#if (DEBUG & DEBUG_PHASES)
1990 print_sbic_status(asr, ssr, host->scsi.phase);
1991#endif
1992
1993 ADD_STATUS(8, ssr, host->scsi.phase, in_irq);
1994
1995 if (host->SCpnt && !host->scsi.disconnectable)
1996 ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, in_irq);
1997
1998 switch (ssr) {
1999 case 0x00: /* reset state - not advanced */
2000 printk(KERN_ERR "scsi%d: reset in standard mode but wanted advanced mode.\n",
2001 host->host->host_no);
2002 /* setup sbic - WD33C93A */
2003 sbic_arm_write(host->scsi.io_port, SBIC_OWNID, OWNID_EAF | host->host->this_id);
2004 sbic_arm_write(host->scsi.io_port, SBIC_CMND, CMND_RESET);
2005 return INTR_IDLE;
2006
2007 case 0x01: /* reset state - advanced */
2008 sbic_arm_write(host->scsi.io_port, SBIC_CTRL, INIT_SBICDMA | CTRL_IDI);
2009 sbic_arm_write(host->scsi.io_port, SBIC_TIMEOUT, TIMEOUT_TIME);
2010 sbic_arm_write(host->scsi.io_port, SBIC_SYNCHTRANSFER, SYNCHTRANSFER_2DBA);
2011 sbic_arm_write(host->scsi.io_port, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP);
2012 msgqueue_flush(&host->scsi.msgs);
2013 return INTR_IDLE;
2014
2015 case 0x41: /* unexpected disconnect aborted command */
2016 acornscsi_disconnect_unexpected(host);
2017 return INTR_NEXT_COMMAND;
2018 }
2019
2020 switch (host->scsi.phase) {
2021 case PHASE_CONNECTING: /* STATE: command removed from issue queue */
2022 switch (ssr) {
2023 case 0x11: /* -> PHASE_CONNECTED */
2024 /* BUS FREE -> SELECTION */
2025 host->scsi.phase = PHASE_CONNECTED;
2026 msgqueue_flush(&host->scsi.msgs);
2027 host->dma.transferred = host->scsi.SCp.scsi_xferred;
2028 /* 33C93 gives next interrupt indicating bus phase */
2029 asr = sbic_arm_read(host->scsi.io_port, SBIC_ASR);
2030 if (!(asr & ASR_INT))
2031 break;
2032 ssr = sbic_arm_read(host->scsi.io_port, SBIC_SSR);
2033 ADD_STATUS(8, ssr, host->scsi.phase, 1);
2034 ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, 1);
2035 goto connected;
2036
2037 case 0x42: /* select timed out */
2038 /* -> PHASE_IDLE */
2039 acornscsi_done(host, &host->SCpnt, DID_NO_CONNECT);
2040 return INTR_NEXT_COMMAND;
2041
2042 case 0x81: /* -> PHASE_RECONNECTED or PHASE_ABORTED */
2043 /* BUS FREE -> RESELECTION */
2044 host->origSCpnt = host->SCpnt;
2045 host->SCpnt = NULL;
2046 msgqueue_flush(&host->scsi.msgs);
2047 acornscsi_reconnect(host);
2048 break;
2049
2050 default:
2051 printk(KERN_ERR "scsi%d.%c: PHASE_CONNECTING, SSR %02X?\n",
2052 host->host->host_no, acornscsi_target(host), ssr);
2053 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2054 acornscsi_abortcmd(host, host->SCpnt->tag);
2055 }
2056 return INTR_PROCESSING;
2057
2058 connected:
2059 case PHASE_CONNECTED: /* STATE: device selected ok */
2060 switch (ssr) {
2061#ifdef NONSTANDARD
2062 case 0x8a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */
2063 /* SELECTION -> COMMAND */
2064 acornscsi_sendcommand(host);
2065 break;
2066
2067 case 0x8b: /* -> PHASE_STATUS */
2068 /* SELECTION -> STATUS */
2069 acornscsi_readstatusbyte(host);
2070 host->scsi.phase = PHASE_STATUSIN;
2071 break;
2072#endif
2073
2074 case 0x8e: /* -> PHASE_MSGOUT */
2075 /* SELECTION ->MESSAGE OUT */
2076 host->scsi.phase = PHASE_MSGOUT;
2077 acornscsi_buildmessages(host);
2078 acornscsi_sendmessage(host);
2079 break;
2080
2081 /* these should not happen */
2082 case 0x85: /* target disconnected */
2083 acornscsi_done(host, &host->SCpnt, DID_ERROR);
2084 break;
2085
2086 default:
2087 printk(KERN_ERR "scsi%d.%c: PHASE_CONNECTED, SSR %02X?\n",
2088 host->host->host_no, acornscsi_target(host), ssr);
2089 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2090 acornscsi_abortcmd(host, host->SCpnt->tag);
2091 }
2092 return INTR_PROCESSING;
2093
2094 case PHASE_MSGOUT: /* STATE: connected & sent IDENTIFY message */
2095 /*
2096 * SCSI standard says that MESSAGE OUT phases can be followed by a
2097 * DATA phase, STATUS phase, MESSAGE IN phase or COMMAND phase
2098 */
2099 switch (ssr) {
2100 case 0x8a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */
2101 case 0x1a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */
2102 /* MESSAGE OUT -> COMMAND */
2103 acornscsi_sendcommand(host);
2104 break;
2105
2106 case 0x8b: /* -> PHASE_STATUS */
2107 case 0x1b: /* -> PHASE_STATUS */
2108 /* MESSAGE OUT -> STATUS */
2109 acornscsi_readstatusbyte(host);
2110 host->scsi.phase = PHASE_STATUSIN;
2111 break;
2112
2113 case 0x8e: /* -> PHASE_MSGOUT */
2114 /* MESSAGE_OUT(MESSAGE_IN) ->MESSAGE OUT */
2115 acornscsi_sendmessage(host);
2116 break;
2117
2118 case 0x4f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */
2119 case 0x1f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */
2120 /* MESSAGE OUT -> MESSAGE IN */
2121 acornscsi_message(host);
2122 break;
2123
2124 default:
2125 printk(KERN_ERR "scsi%d.%c: PHASE_MSGOUT, SSR %02X?\n",
2126 host->host->host_no, acornscsi_target(host), ssr);
2127 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2128 }
2129 return INTR_PROCESSING;
2130
2131 case PHASE_COMMAND: /* STATE: connected & command sent */
2132 switch (ssr) {
2133 case 0x18: /* -> PHASE_DATAOUT */
2134 /* COMMAND -> DATA OUT */
2135 if (host->scsi.SCp.sent_command != host->SCpnt->cmd_len)
2136 acornscsi_abortcmd(host, host->SCpnt->tag);
2137 acornscsi_dma_setup(host, DMA_OUT);
2138 if (!acornscsi_starttransfer(host))
2139 acornscsi_abortcmd(host, host->SCpnt->tag);
2140 host->scsi.phase = PHASE_DATAOUT;
2141 return INTR_IDLE;
2142
2143 case 0x19: /* -> PHASE_DATAIN */
2144 /* COMMAND -> DATA IN */
2145 if (host->scsi.SCp.sent_command != host->SCpnt->cmd_len)
2146 acornscsi_abortcmd(host, host->SCpnt->tag);
2147 acornscsi_dma_setup(host, DMA_IN);
2148 if (!acornscsi_starttransfer(host))
2149 acornscsi_abortcmd(host, host->SCpnt->tag);
2150 host->scsi.phase = PHASE_DATAIN;
2151 return INTR_IDLE;
2152
2153 case 0x1b: /* -> PHASE_STATUS */
2154 /* COMMAND -> STATUS */
2155 acornscsi_readstatusbyte(host);
2156 host->scsi.phase = PHASE_STATUSIN;
2157 break;
2158
2159 case 0x1e: /* -> PHASE_MSGOUT */
2160 /* COMMAND -> MESSAGE OUT */
2161 acornscsi_sendmessage(host);
2162 break;
2163
2164 case 0x1f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */
2165 /* COMMAND -> MESSAGE IN */
2166 acornscsi_message(host);
2167 break;
2168
2169 default:
2170 printk(KERN_ERR "scsi%d.%c: PHASE_COMMAND, SSR %02X?\n",
2171 host->host->host_no, acornscsi_target(host), ssr);
2172 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2173 }
2174 return INTR_PROCESSING;
2175
2176 case PHASE_DISCONNECT: /* STATE: connected, received DISCONNECT msg */
2177 if (ssr == 0x85) { /* -> PHASE_IDLE */
2178 host->scsi.disconnectable = 1;
2179 host->scsi.reconnected.tag = 0;
2180 host->scsi.phase = PHASE_IDLE;
2181 host->stats.disconnects += 1;
2182 } else {
2183 printk(KERN_ERR "scsi%d.%c: PHASE_DISCONNECT, SSR %02X instead of disconnect?\n",
2184 host->host->host_no, acornscsi_target(host), ssr);
2185 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2186 }
2187 return INTR_NEXT_COMMAND;
2188
2189 case PHASE_IDLE: /* STATE: disconnected */
2190 if (ssr == 0x81) /* -> PHASE_RECONNECTED or PHASE_ABORTED */
2191 acornscsi_reconnect(host);
2192 else {
2193 printk(KERN_ERR "scsi%d.%c: PHASE_IDLE, SSR %02X while idle?\n",
2194 host->host->host_no, acornscsi_target(host), ssr);
2195 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2196 }
2197 return INTR_PROCESSING;
2198
2199 case PHASE_RECONNECTED: /* STATE: device reconnected to initiator */
2200 /*
2201 * Command reconnected - if MESGIN, get message - it may be
2202 * the tag. If not, get command out of disconnected queue
2203 */
2204 /*
2205 * If we reconnected and we're not in MESSAGE IN phase after IDENTIFY,
2206 * reconnect I_T_L command
2207 */
2208 if (ssr != 0x8f && !acornscsi_reconnect_finish(host))
2209 return INTR_IDLE;
2210 ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, in_irq);
2211 switch (ssr) {
2212 case 0x88: /* data out phase */
2213 /* -> PHASE_DATAOUT */
2214 /* MESSAGE IN -> DATA OUT */
2215 acornscsi_dma_setup(host, DMA_OUT);
2216 if (!acornscsi_starttransfer(host))
2217 acornscsi_abortcmd(host, host->SCpnt->tag);
2218 host->scsi.phase = PHASE_DATAOUT;
2219 return INTR_IDLE;
2220
2221 case 0x89: /* data in phase */
2222 /* -> PHASE_DATAIN */
2223 /* MESSAGE IN -> DATA IN */
2224 acornscsi_dma_setup(host, DMA_IN);
2225 if (!acornscsi_starttransfer(host))
2226 acornscsi_abortcmd(host, host->SCpnt->tag);
2227 host->scsi.phase = PHASE_DATAIN;
2228 return INTR_IDLE;
2229
2230 case 0x8a: /* command out */
2231 /* MESSAGE IN -> COMMAND */
2232 acornscsi_sendcommand(host);/* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */
2233 break;
2234
2235 case 0x8b: /* status in */
2236 /* -> PHASE_STATUSIN */
2237 /* MESSAGE IN -> STATUS */
2238 acornscsi_readstatusbyte(host);
2239 host->scsi.phase = PHASE_STATUSIN;
2240 break;
2241
2242 case 0x8e: /* message out */
2243 /* -> PHASE_MSGOUT */
2244 /* MESSAGE IN -> MESSAGE OUT */
2245 acornscsi_sendmessage(host);
2246 break;
2247
2248 case 0x8f: /* message in */
2249 acornscsi_message(host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */
2250 break;
2251
2252 default:
2253 printk(KERN_ERR "scsi%d.%c: PHASE_RECONNECTED, SSR %02X after reconnect?\n",
2254 host->host->host_no, acornscsi_target(host), ssr);
2255 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2256 }
2257 return INTR_PROCESSING;
2258
2259 case PHASE_DATAIN: /* STATE: transferred data in */
2260 /*
2261 * This is simple - if we disconnect then the DMA address & count is
2262 * correct.
2263 */
2264 switch (ssr) {
2265 case 0x19: /* -> PHASE_DATAIN */
2266 case 0x89: /* -> PHASE_DATAIN */
2267 acornscsi_abortcmd(host, host->SCpnt->tag);
2268 return INTR_IDLE;
2269
2270 case 0x1b: /* -> PHASE_STATUSIN */
2271 case 0x4b: /* -> PHASE_STATUSIN */
2272 case 0x8b: /* -> PHASE_STATUSIN */
2273 /* DATA IN -> STATUS */
2274 host->scsi.SCp.scsi_xferred = host->SCpnt->request_bufflen -
2275 acornscsi_sbic_xfcount(host);
2276 acornscsi_dma_stop(host);
2277 acornscsi_readstatusbyte(host);
2278 host->scsi.phase = PHASE_STATUSIN;
2279 break;
2280
2281 case 0x1e: /* -> PHASE_MSGOUT */
2282 case 0x4e: /* -> PHASE_MSGOUT */
2283 case 0x8e: /* -> PHASE_MSGOUT */
2284 /* DATA IN -> MESSAGE OUT */
2285 host->scsi.SCp.scsi_xferred = host->SCpnt->request_bufflen -
2286 acornscsi_sbic_xfcount(host);
2287 acornscsi_dma_stop(host);
2288 acornscsi_sendmessage(host);
2289 break;
2290
2291 case 0x1f: /* message in */
2292 case 0x4f: /* message in */
2293 case 0x8f: /* message in */
2294 /* DATA IN -> MESSAGE IN */
2295 host->scsi.SCp.scsi_xferred = host->SCpnt->request_bufflen -
2296 acornscsi_sbic_xfcount(host);
2297 acornscsi_dma_stop(host);
2298 acornscsi_message(host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */
2299 break;
2300
2301 default:
2302 printk(KERN_ERR "scsi%d.%c: PHASE_DATAIN, SSR %02X?\n",
2303 host->host->host_no, acornscsi_target(host), ssr);
2304 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2305 }
2306 return INTR_PROCESSING;
2307
2308 case PHASE_DATAOUT: /* STATE: transferred data out */
2309 /*
2310 * This is more complicated - if we disconnect, the DMA could be 12
2311 * bytes ahead of us. We need to correct this.
2312 */
2313 switch (ssr) {
2314 case 0x18: /* -> PHASE_DATAOUT */
2315 case 0x88: /* -> PHASE_DATAOUT */
2316 acornscsi_abortcmd(host, host->SCpnt->tag);
2317 return INTR_IDLE;
2318
2319 case 0x1b: /* -> PHASE_STATUSIN */
2320 case 0x4b: /* -> PHASE_STATUSIN */
2321 case 0x8b: /* -> PHASE_STATUSIN */
2322 /* DATA OUT -> STATUS */
2323 host->scsi.SCp.scsi_xferred = host->SCpnt->request_bufflen -
2324 acornscsi_sbic_xfcount(host);
2325 acornscsi_dma_stop(host);
2326 acornscsi_dma_adjust(host);
2327 acornscsi_readstatusbyte(host);
2328 host->scsi.phase = PHASE_STATUSIN;
2329 break;
2330
2331 case 0x1e: /* -> PHASE_MSGOUT */
2332 case 0x4e: /* -> PHASE_MSGOUT */
2333 case 0x8e: /* -> PHASE_MSGOUT */
2334 /* DATA OUT -> MESSAGE OUT */
2335 host->scsi.SCp.scsi_xferred = host->SCpnt->request_bufflen -
2336 acornscsi_sbic_xfcount(host);
2337 acornscsi_dma_stop(host);
2338 acornscsi_dma_adjust(host);
2339 acornscsi_sendmessage(host);
2340 break;
2341
2342 case 0x1f: /* message in */
2343 case 0x4f: /* message in */
2344 case 0x8f: /* message in */
2345 /* DATA OUT -> MESSAGE IN */
2346 host->scsi.SCp.scsi_xferred = host->SCpnt->request_bufflen -
2347 acornscsi_sbic_xfcount(host);
2348 acornscsi_dma_stop(host);
2349 acornscsi_dma_adjust(host);
2350 acornscsi_message(host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */
2351 break;
2352
2353 default:
2354 printk(KERN_ERR "scsi%d.%c: PHASE_DATAOUT, SSR %02X?\n",
2355 host->host->host_no, acornscsi_target(host), ssr);
2356 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2357 }
2358 return INTR_PROCESSING;
2359
2360 case PHASE_STATUSIN: /* STATE: status in complete */
2361 switch (ssr) {
2362 case 0x1f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */
2363 case 0x8f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */
2364 /* STATUS -> MESSAGE IN */
2365 acornscsi_message(host);
2366 break;
2367
2368 case 0x1e: /* -> PHASE_MSGOUT */
2369 case 0x8e: /* -> PHASE_MSGOUT */
2370 /* STATUS -> MESSAGE OUT */
2371 acornscsi_sendmessage(host);
2372 break;
2373
2374 default:
2375 printk(KERN_ERR "scsi%d.%c: PHASE_STATUSIN, SSR %02X instead of MESSAGE_IN?\n",
2376 host->host->host_no, acornscsi_target(host), ssr);
2377 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2378 }
2379 return INTR_PROCESSING;
2380
2381 case PHASE_MSGIN: /* STATE: message in */
2382 switch (ssr) {
2383 case 0x1e: /* -> PHASE_MSGOUT */
2384 case 0x4e: /* -> PHASE_MSGOUT */
2385 case 0x8e: /* -> PHASE_MSGOUT */
2386 /* MESSAGE IN -> MESSAGE OUT */
2387 acornscsi_sendmessage(host);
2388 break;
2389
2390 case 0x1f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */
2391 case 0x2f:
2392 case 0x4f:
2393 case 0x8f:
2394 acornscsi_message(host);
2395 break;
2396
2397 case 0x85:
2398 printk("scsi%d.%c: strange message in disconnection\n",
2399 host->host->host_no, acornscsi_target(host));
2400 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2401 acornscsi_done(host, &host->SCpnt, DID_ERROR);
2402 break;
2403
2404 default:
2405 printk(KERN_ERR "scsi%d.%c: PHASE_MSGIN, SSR %02X after message in?\n",
2406 host->host->host_no, acornscsi_target(host), ssr);
2407 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2408 }
2409 return INTR_PROCESSING;
2410
2411 case PHASE_DONE: /* STATE: received status & message */
2412 switch (ssr) {
2413 case 0x85: /* -> PHASE_IDLE */
2414 acornscsi_done(host, &host->SCpnt, DID_OK);
2415 return INTR_NEXT_COMMAND;
2416
2417 case 0x1e:
2418 case 0x8e:
2419 acornscsi_sendmessage(host);
2420 break;
2421
2422 default:
2423 printk(KERN_ERR "scsi%d.%c: PHASE_DONE, SSR %02X instead of disconnect?\n",
2424 host->host->host_no, acornscsi_target(host), ssr);
2425 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2426 }
2427 return INTR_PROCESSING;
2428
2429 case PHASE_ABORTED:
2430 switch (ssr) {
2431 case 0x85:
2432 if (host->SCpnt)
2433 acornscsi_done(host, &host->SCpnt, DID_ABORT);
2434 else {
2435 clear_bit(host->scsi.reconnected.target * 8 + host->scsi.reconnected.lun,
2436 host->busyluns);
2437 host->scsi.phase = PHASE_IDLE;
2438 }
2439 return INTR_NEXT_COMMAND;
2440
2441 case 0x1e:
2442 case 0x2e:
2443 case 0x4e:
2444 case 0x8e:
2445 acornscsi_sendmessage(host);
2446 break;
2447
2448 default:
2449 printk(KERN_ERR "scsi%d.%c: PHASE_ABORTED, SSR %02X?\n",
2450 host->host->host_no, acornscsi_target(host), ssr);
2451 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2452 }
2453 return INTR_PROCESSING;
2454
2455 default:
2456 printk(KERN_ERR "scsi%d.%c: unknown driver phase %d\n",
2457 host->host->host_no, acornscsi_target(host), ssr);
2458 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2459 }
2460 return INTR_PROCESSING;
2461}
2462
2463/*
7d12e780 2464 * Prototype: void acornscsi_intr(int irq, void *dev_id)
1da177e4
LT		 2465 * Purpose : handle interrupts from Acorn SCSI card
2466 * Params : irq - interrupt number
2467 * dev_id - device specific data (AS_Host structure)
1da177e4
LT		 2468 */
2469static irqreturn_t
7d12e780 2470acornscsi_intr(int irq, void *dev_id)
1da177e4
LT		 2471{
2472 AS_Host *host = (AS_Host *)dev_id;
2473 intr_ret_t ret;
2474 int iostatus;
2475 int in_irq = 0;
2476
2477 do {
2478 ret = INTR_IDLE;
2479
2480 iostatus = inb(host->card.io_intr);
2481
2482 if (iostatus & 2) {
2483 acornscsi_dma_intr(host);
2484 iostatus = inb(host->card.io_intr);
2485 }
2486
2487 if (iostatus & 8)
2488 ret = acornscsi_sbicintr(host, in_irq);
2489
2490 /*
2491 * If we have a transfer pending, start it.
2492 * Only start it if the interface has already started transferring
2493 * it's data
2494 */
2495 if (host->dma.xfer_required)
2496 acornscsi_dma_xfer(host);
2497
2498 if (ret == INTR_NEXT_COMMAND)
2499 ret = acornscsi_kick(host);
2500
2501 in_irq = 1;
2502 } while (ret != INTR_IDLE);
2503
2504 return IRQ_HANDLED;
2505}
2506
2507/*=============================================================================================
2508 * Interfaces between interrupt handler and rest of scsi code
2509 */
2510
2511/*
ee0ca6ba 2512 * Function : acornscsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
1da177e4
LT		 2513 * Purpose : queues a SCSI command
2514 * Params : cmd - SCSI command
2515 * done - function called on completion, with pointer to command descriptor
2516 * Returns : 0, or < 0 on error.
2517 */
ee0ca6ba
HK		 2518int acornscsi_queuecmd(struct scsi_cmnd *SCpnt,
2519 void (*done)(struct scsi_cmnd *))
1da177e4
LT		 2520{
2521 AS_Host *host = (AS_Host *)SCpnt->device->host->hostdata;
2522
2523 if (!done) {
2524 /* there should be some way of rejecting errors like this without panicing... */
2525 panic("scsi%d: queuecommand called with NULL done function [cmd=%p]",
2526 host->host->host_no, SCpnt);
2527 return -EINVAL;
2528 }
2529
2530#if (DEBUG & DEBUG_NO_WRITE)
2531 if (acornscsi_cmdtype(SCpnt->cmnd[0]) == CMD_WRITE && (NO_WRITE & (1 << SCpnt->device->id))) {
2532 printk(KERN_CRIT "scsi%d.%c: WRITE attempted with NO_WRITE flag set\n",
2533 host->host->host_no, '0' + SCpnt->device->id);
2534 SCpnt->result = DID_NO_CONNECT << 16;
2535 done(SCpnt);
2536 return 0;
2537 }
2538#endif
2539
2540 SCpnt->scsi_done = done;
2541 SCpnt->host_scribble = NULL;
2542 SCpnt->result = 0;
2543 SCpnt->tag = 0;
2544 SCpnt->SCp.phase = (int)acornscsi_datadirection(SCpnt->cmnd[0]);
2545 SCpnt->SCp.sent_command = 0;
2546 SCpnt->SCp.scsi_xferred = 0;
2547
2548 init_SCp(SCpnt);
2549
2550 host->stats.queues += 1;
2551
2552 {
2553 unsigned long flags;
2554
2555 if (!queue_add_cmd_ordered(&host->queues.issue, SCpnt)) {
2556 SCpnt->result = DID_ERROR << 16;
2557 done(SCpnt);
2558 return 0;
2559 }
2560 local_irq_save(flags);
2561 if (host->scsi.phase == PHASE_IDLE)
2562 acornscsi_kick(host);
2563 local_irq_restore(flags);
2564 }
2565 return 0;
2566}
2567
2568/*
ee0ca6ba 2569 * Prototype: void acornscsi_reportstatus(struct scsi_cmnd **SCpntp1, struct scsi_cmnd **SCpntp2, int result)
1da177e4
LT		 2570 * Purpose : pass a result to *SCpntp1, and check if *SCpntp1 = *SCpntp2
2571 * Params : SCpntp1 - pointer to command to return
2572 * SCpntp2 - pointer to command to check
2573 * result - result to pass back to mid-level done function
2574 * Returns : *SCpntp2 = NULL if *SCpntp1 is the same command structure as *SCpntp2.
2575 */
ee0ca6ba
HK		 2576static inline void acornscsi_reportstatus(struct scsi_cmnd **SCpntp1,
2577 struct scsi_cmnd **SCpntp2,
2578 int result)
1da177e4 2579{
ee0ca6ba 2580 struct scsi_cmnd *SCpnt = *SCpntp1;
1da177e4
LT		 2581
2582 if (SCpnt) {
2583 *SCpntp1 = NULL;
2584
2585 SCpnt->result = result;
2586 SCpnt->scsi_done(SCpnt);
2587 }
2588
2589 if (SCpnt == *SCpntp2)
2590 *SCpntp2 = NULL;
2591}
2592
2593enum res_abort { res_not_running, res_success, res_success_clear, res_snooze };
2594
2595/*
ee0ca6ba 2596 * Prototype: enum res acornscsi_do_abort(struct scsi_cmnd *SCpnt)
1da177e4
LT		 2597 * Purpose : abort a command on this host
2598 * Params : SCpnt - command to abort
2599 * Returns : our abort status
2600 */
ee0ca6ba 2601static enum res_abort acornscsi_do_abort(AS_Host *host, struct scsi_cmnd *SCpnt)
1da177e4
LT		 2602{
2603 enum res_abort res = res_not_running;
2604
2605 if (queue_remove_cmd(&host->queues.issue, SCpnt)) {
2606 /*
2607 * The command was on the issue queue, and has not been
2608 * issued yet. We can remove the command from the queue,
2609 * and acknowledge the abort. Neither the devices nor the
2610 * interface know about the command.
2611 */
2612//#if (DEBUG & DEBUG_ABORT)
2613 printk("on issue queue ");
2614//#endif
2615 res = res_success;
2616 } else if (queue_remove_cmd(&host->queues.disconnected, SCpnt)) {
2617 /*
2618 * The command was on the disconnected queue. Simply
2619 * acknowledge the abort condition, and when the target
2620 * reconnects, we will give it an ABORT message. The
2621 * target should then disconnect, and we will clear
2622 * the busylun bit.
2623 */
2624//#if (DEBUG & DEBUG_ABORT)
2625 printk("on disconnected queue ");
2626//#endif
2627 res = res_success;
2628 } else if (host->SCpnt == SCpnt) {
2629 unsigned long flags;
2630
2631//#if (DEBUG & DEBUG_ABORT)
2632 printk("executing ");
2633//#endif
2634
2635 local_irq_save(flags);
2636 switch (host->scsi.phase) {
2637 /*
2638 * If the interface is idle, and the command is 'disconnectable',
2639 * then it is the same as on the disconnected queue. We simply
2640 * remove all traces of the command. When the target reconnects,
2641 * we will give it an ABORT message since the command could not
2642 * be found. When the target finally disconnects, we will clear
2643 * the busylun bit.
2644 */
2645 case PHASE_IDLE:
2646 if (host->scsi.disconnectable) {
2647 host->scsi.disconnectable = 0;
2648 host->SCpnt = NULL;
2649 res = res_success;
2650 }
2651 break;
2652
2653 /*
2654 * If the command has connected and done nothing further,
2655 * simply force a disconnect. We also need to clear the
2656 * busylun bit.
2657 */
2658 case PHASE_CONNECTED:
2659 sbic_arm_write(host->scsi.io_port, SBIC_CMND, CMND_DISCONNECT);
2660 host->SCpnt = NULL;
2661 res = res_success_clear;
2662 break;
2663
2664 default:
2665 acornscsi_abortcmd(host, host->SCpnt->tag);
2666 res = res_snooze;
2667 }
2668 local_irq_restore(flags);
2669 } else if (host->origSCpnt == SCpnt) {
2670 /*
2671 * The command will be executed next, but a command
2672 * is currently using the interface. This is similar to
2673 * being on the issue queue, except the busylun bit has
2674 * been set.
2675 */
2676 host->origSCpnt = NULL;
2677//#if (DEBUG & DEBUG_ABORT)
2678 printk("waiting for execution ");
2679//#endif
2680 res = res_success_clear;
2681 } else
2682 printk("unknown ");
2683
2684 return res;
2685}
2686
2687/*
ee0ca6ba 2688 * Prototype: int acornscsi_abort(struct scsi_cmnd *SCpnt)
1da177e4
LT		 2689 * Purpose : abort a command on this host
2690 * Params : SCpnt - command to abort
2691 * Returns : one of SCSI_ABORT_ macros
2692 */
ee0ca6ba 2693int acornscsi_abort(struct scsi_cmnd *SCpnt)
1da177e4
LT		 2694{
2695 AS_Host *host = (AS_Host *) SCpnt->device->host->hostdata;
2696 int result;
2697
2698 host->stats.aborts += 1;
2699
2700#if (DEBUG & DEBUG_ABORT)
2701 {
2702 int asr, ssr;
2703 asr = sbic_arm_read(host->scsi.io_port, SBIC_ASR);
2704 ssr = sbic_arm_read(host->scsi.io_port, SBIC_SSR);
2705
2706 printk(KERN_WARNING "acornscsi_abort: ");
2707 print_sbic_status(asr, ssr, host->scsi.phase);
2708 acornscsi_dumplog(host, SCpnt->device->id);
2709 }
2710#endif
2711
2712 printk("scsi%d: ", host->host->host_no);
2713
2714 switch (acornscsi_do_abort(host, SCpnt)) {
2715 /*
2716 * We managed to find the command and cleared it out.
2717 * We do not expect the command to be executing on the
2718 * target, but we have set the busylun bit.
2719 */
2720 case res_success_clear:
2721//#if (DEBUG & DEBUG_ABORT)
2722 printk("clear ");
2723//#endif
2724 clear_bit(SCpnt->device->id * 8 + SCpnt->device->lun, host->busyluns);
2725
2726 /*
2727 * We found the command, and cleared it out. Either
2728 * the command is still known to be executing on the
2729 * target, or the busylun bit is not set.
2730 */
2731 case res_success:
2732//#if (DEBUG & DEBUG_ABORT)
2733 printk("success\n");
2734//#endif
2735 SCpnt->result = DID_ABORT << 16;
2736 SCpnt->scsi_done(SCpnt);
2737 result = SCSI_ABORT_SUCCESS;
2738 break;
2739
2740 /*
2741 * We did find the command, but unfortunately we couldn't
2742 * unhook it from ourselves. Wait some more, and if it
2743 * still doesn't complete, reset the interface.
2744 */
2745 case res_snooze:
2746//#if (DEBUG & DEBUG_ABORT)
2747 printk("snooze\n");
2748//#endif
2749 result = SCSI_ABORT_SNOOZE;
2750 break;
2751
2752 /*
2753 * The command could not be found (either because it completed,
2754 * or it got dropped.
2755 */
2756 default:
2757 case res_not_running:
2758 acornscsi_dumplog(host, SCpnt->device->id);
2759#if (DEBUG & DEBUG_ABORT)
2760 result = SCSI_ABORT_SNOOZE;
2761#else
2762 result = SCSI_ABORT_NOT_RUNNING;
2763#endif
2764//#if (DEBUG & DEBUG_ABORT)
2765 printk("not running\n");
2766//#endif
2767 break;
2768 }
2769
2770 return result;
2771}
2772
2773/*
ee0ca6ba 2774 * Prototype: int acornscsi_reset(struct scsi_cmnd *SCpnt, unsigned int reset_flags)
1da177e4
LT		 2775 * Purpose : reset a command on this host/reset this host
2776 * Params : SCpnt - command causing reset
2777 * result - what type of reset to perform
2778 * Returns : one of SCSI_RESET_ macros
2779 */
ee0ca6ba 2780int acornscsi_reset(struct scsi_cmnd *SCpnt, unsigned int reset_flags)
1da177e4 2781{
ee0ca6ba
HK		 2782 AS_Host *host = (AS_Host *)SCpnt->device->host->hostdata;
2783 struct scsi_cmnd *SCptr;
1da177e4
LT		 2784
2785 host->stats.resets += 1;
2786
2787#if (DEBUG & DEBUG_RESET)
2788 {
2789 int asr, ssr;
2790
2791 asr = sbic_arm_read(host->scsi.io_port, SBIC_ASR);
2792 ssr = sbic_arm_read(host->scsi.io_port, SBIC_SSR);
2793
2794 printk(KERN_WARNING "acornscsi_reset: ");
2795 print_sbic_status(asr, ssr, host->scsi.phase);
2796 acornscsi_dumplog(host, SCpnt->device->id);
2797 }
2798#endif
2799
2800 acornscsi_dma_stop(host);
2801
2802 SCptr = host->SCpnt;
2803
2804 /*
2805 * do hard reset. This resets all devices on this host, and so we
2806 * must set the reset status on all commands.
2807 */
2808 acornscsi_resetcard(host);
2809
2810 /*
2811 * report reset on commands current connected/disconnected
2812 */
2813 acornscsi_reportstatus(&host->SCpnt, &SCptr, DID_RESET);
2814
2815 while ((SCptr = queue_remove(&host->queues.disconnected)) != NULL)
2816 acornscsi_reportstatus(&SCptr, &SCpnt, DID_RESET);
2817
2818 if (SCpnt) {
2819 SCpnt->result = DID_RESET << 16;
2820 SCpnt->scsi_done(SCpnt);
2821 }
2822
2823 return SCSI_RESET_BUS_RESET | SCSI_RESET_HOST_RESET | SCSI_RESET_SUCCESS;
2824}
2825
2826/*==============================================================================================
2827 * initialisation & miscellaneous support
2828 */
2829
2830/*
2831 * Function: char *acornscsi_info(struct Scsi_Host *host)
2832 * Purpose : return a string describing this interface
2833 * Params : host - host to give information on
2834 * Returns : a constant string
2835 */
2836const
2837char *acornscsi_info(struct Scsi_Host *host)
2838{
2839 static char string[100], *p;
2840
2841 p = string;
2842
2843 p += sprintf(string, "%s at port %08lX irq %d v%d.%d.%d"
2844#ifdef CONFIG_SCSI_ACORNSCSI_SYNC
2845 " SYNC"
2846#endif
2847#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
2848 " TAG"
2849#endif
2850#ifdef CONFIG_SCSI_ACORNSCSI_LINK
2851 " LINK"
2852#endif
2853#if (DEBUG & DEBUG_NO_WRITE)
2854 " NOWRITE ("NO_WRITE_STR")"
2855#endif
2856 , host->hostt->name, host->io_port, host->irq,
2857 VER_MAJOR, VER_MINOR, VER_PATCH);
2858 return string;
2859}
2860
2861int acornscsi_proc_info(struct Scsi_Host *instance, char *buffer, char **start, off_t offset,
2862 int length, int inout)
2863{
2864 int pos, begin = 0, devidx;
f64a181d 2865 struct scsi_device *scd;
1da177e4
LT		 2866 AS_Host *host;
2867 char *p = buffer;
2868
2869 if (inout == 1)
2870 return -EINVAL;
2871
2872 host = (AS_Host *)instance->hostdata;
2873
2874 p += sprintf(p, "AcornSCSI driver v%d.%d.%d"
2875#ifdef CONFIG_SCSI_ACORNSCSI_SYNC
2876 " SYNC"
2877#endif
2878#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
2879 " TAG"
2880#endif
2881#ifdef CONFIG_SCSI_ACORNSCSI_LINK
2882 " LINK"
2883#endif
2884#if (DEBUG & DEBUG_NO_WRITE)
2885 " NOWRITE ("NO_WRITE_STR")"
2886#endif
2887 "\n\n", VER_MAJOR, VER_MINOR, VER_PATCH);
2888
2889 p += sprintf(p, "SBIC: WD33C93A Address: %08X IRQ : %d\n",
2890 host->scsi.io_port, host->scsi.irq);
2891#ifdef USE_DMAC
2892 p += sprintf(p, "DMAC: uPC71071 Address: %08X IRQ : %d\n\n",
2893 host->dma.io_port, host->scsi.irq);
2894#endif
2895
2896 p += sprintf(p, "Statistics:\n"
2897 "Queued commands: %-10u Issued commands: %-10u\n"
2898 "Done commands : %-10u Reads : %-10u\n"
2899 "Writes : %-10u Others : %-10u\n"
2900 "Disconnects : %-10u Aborts : %-10u\n"
2901 "Resets : %-10u\n\nLast phases:",
2902 host->stats.queues, host->stats.removes,
2903 host->stats.fins, host->stats.reads,
2904 host->stats.writes, host->stats.miscs,
2905 host->stats.disconnects, host->stats.aborts,
2906 host->stats.resets);
2907
2908 for (devidx = 0; devidx < 9; devidx ++) {
2909 unsigned int statptr, prev;
2910
2911 p += sprintf(p, "\n%c:", devidx == 8 ? 'H' : ('0' + devidx));
2912 statptr = host->status_ptr[devidx] - 10;
2913
2914 if ((signed int)statptr < 0)
2915 statptr += STATUS_BUFFER_SIZE;
2916
2917 prev = host->status[devidx][statptr].when;
2918
2919 for (; statptr != host->status_ptr[devidx]; statptr = (statptr + 1) & (STATUS_BUFFER_SIZE - 1)) {
2920 if (host->status[devidx][statptr].when) {
2921 p += sprintf(p, "%c%02X:%02X+%2ld",
2922 host->status[devidx][statptr].irq ? '-' : ' ',
2923 host->status[devidx][statptr].ph,
2924 host->status[devidx][statptr].ssr,
2925 (host->status[devidx][statptr].when - prev) < 100 ?
2926 (host->status[devidx][statptr].when - prev) : 99);
2927 prev = host->status[devidx][statptr].when;
2928 }
2929 }
2930 }
2931
2932 p += sprintf(p, "\nAttached devices:\n");
2933
2934 shost_for_each_device(scd, instance) {
2935 p += sprintf(p, "Device/Lun TaggedQ Sync\n");
2936 p += sprintf(p, " %d/%d ", scd->id, scd->lun);
2937 if (scd->tagged_supported)
2938 p += sprintf(p, "%3sabled(%3d) ",
2939 scd->simple_tags ? "en" : "dis",
2940 scd->current_tag);
2941 else
2942 p += sprintf(p, "unsupported ");
2943
2944 if (host->device[scd->id].sync_xfer & 15)
2945 p += sprintf(p, "offset %d, %d ns\n",
2946 host->device[scd->id].sync_xfer & 15,
2947 acornscsi_getperiod(host->device[scd->id].sync_xfer));
2948 else
2949 p += sprintf(p, "async\n");
2950
2951 pos = p - buffer;
2952 if (pos + begin < offset) {
2953 begin += pos;
2954 p = buffer;
2955 }
2956 pos = p - buffer;
2957 if (pos + begin > offset + length) {
2958 scsi_device_put(scd);
2959 break;
2960 }
2961 }
2962
2963 pos = p - buffer;
2964
2965 *start = buffer + (offset - begin);
2966 pos -= offset - begin;
2967
2968 if (pos > length)
2969 pos = length;
2970
2971 return pos;
2972}
2973
d0be4a7d 2974static struct scsi_host_template acornscsi_template = {
1da177e4
LT		 2975 .module = THIS_MODULE,
2976 .proc_info = acornscsi_proc_info,
2977 .name = "AcornSCSI",
2978 .info = acornscsi_info,
2979 .queuecommand = acornscsi_queuecmd,
2980#warning fixme
2981 .abort = acornscsi_abort,
2982 .reset = acornscsi_reset,
2983 .can_queue = 16,
2984 .this_id = 7,
2985 .sg_tablesize = SG_ALL,
2986 .cmd_per_lun = 2,
2987 .unchecked_isa_dma = 0,
2988 .use_clustering = DISABLE_CLUSTERING,
2989 .proc_name = "acornscsi",
2990};
2991
2992static int __devinit
2993acornscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
2994{
2995 struct Scsi_Host *host;
2996 AS_Host *ashost;
2997 int ret = -ENOMEM;
2998
2999 host = scsi_host_alloc(&acornscsi_template, sizeof(AS_Host));
3000 if (!host)
3001 goto out;
3002
3003 ashost = (AS_Host *)host->hostdata;
3004
3005 host->io_port = ecard_address(ec, ECARD_MEMC, 0);
3006 host->irq = ec->irq;
3007
3008 ashost->host = host;
3009 ashost->scsi.io_port = ioaddr(host->io_port + 0x800);
3010 ashost->scsi.irq = host->irq;
3011 ashost->card.io_intr = POD_SPACE(host->io_port) + 0x800;
3012 ashost->card.io_page = POD_SPACE(host->io_port) + 0xc00;
3013 ashost->card.io_ram = ioaddr(host->io_port);
3014 ashost->dma.io_port = host->io_port + 0xc00;
3015 ashost->dma.io_intr_clear = POD_SPACE(host->io_port) + 0x800;
3016
3017 ec->irqaddr = (char *)ioaddr(ashost->card.io_intr);
3018 ec->irqmask = 0x0a;
3019
3020 ret = -EBUSY;
3021 if (!request_region(host->io_port + 0x800, 2, "acornscsi(sbic)"))
3022 goto err_1;
3023 if (!request_region(ashost->card.io_intr, 1, "acornscsi(intr)"))
3024 goto err_2;
3025 if (!request_region(ashost->card.io_page, 1, "acornscsi(page)"))
3026 goto err_3;
3027#ifdef USE_DMAC
3028 if (!request_region(ashost->dma.io_port, 256, "acornscsi(dmac)"))
3029 goto err_4;
3030#endif
3031 if (!request_region(host->io_port, 2048, "acornscsi(ram)"))
3032 goto err_5;
3033
1d6f359a 3034 ret = request_irq(host->irq, acornscsi_intr, IRQF_DISABLED, "acornscsi", ashost);
1da177e4
LT		 3035 if (ret) {
3036 printk(KERN_CRIT "scsi%d: IRQ%d not free: %d\n",
3037 host->host_no, ashost->scsi.irq, ret);
3038 goto err_6;
3039 }
3040
3041 memset(&ashost->stats, 0, sizeof (ashost->stats));
3042 queue_initialise(&ashost->queues.issue);
3043 queue_initialise(&ashost->queues.disconnected);
3044 msgqueue_initialise(&ashost->scsi.msgs);
3045
3046 acornscsi_resetcard(ashost);
3047
3048 ret = scsi_add_host(host, &ec->dev);
3049 if (ret)
3050 goto err_7;
3051
3052 scsi_scan_host(host);
3053 goto out;
3054
3055 err_7:
3056 free_irq(host->irq, ashost);
3057 err_6:
3058 release_region(host->io_port, 2048);
3059 err_5:
3060#ifdef USE_DMAC
3061 release_region(ashost->dma.io_port, 256);
3062#endif
3063 err_4:
3064 release_region(ashost->card.io_page, 1);
3065 err_3:
3066 release_region(ashost->card.io_intr, 1);
3067 err_2:
3068 release_region(host->io_port + 0x800, 2);
3069 err_1:
3070 scsi_host_put(host);
3071 out:
3072 return ret;
3073}
3074
3075static void __devexit acornscsi_remove(struct expansion_card *ec)
3076{
3077 struct Scsi_Host *host = ecard_get_drvdata(ec);
3078 AS_Host *ashost = (AS_Host *)host->hostdata;
3079
3080 ecard_set_drvdata(ec, NULL);
3081 scsi_remove_host(host);
3082
3083 /*
3084 * Put card into RESET state
3085 */
3086 outb(0x80, ashost->card.io_page);
3087
3088 free_irq(host->irq, ashost);
3089
3090 release_region(host->io_port + 0x800, 2);
3091 release_region(ashost->card.io_intr, 1);
3092 release_region(ashost->card.io_page, 1);
3093 release_region(ashost->dma.io_port, 256);
3094 release_region(host->io_port, 2048);
3095
3096 msgqueue_free(&ashost->scsi.msgs);
3097 queue_free(&ashost->queues.disconnected);
3098 queue_free(&ashost->queues.issue);
3099 scsi_host_put(host);
3100}
3101
3102static const struct ecard_id acornscsi_cids[] = {
3103 { MANU_ACORN, PROD_ACORN_SCSI },
3104 { 0xffff, 0xffff },
3105};
3106
3107static struct ecard_driver acornscsi_driver = {
3108 .probe = acornscsi_probe,
3109 .remove = __devexit_p(acornscsi_remove),
3110 .id_table = acornscsi_cids,
3111 .drv = {
3112 .name = "acornscsi",
3113 },
3114};
3115
3116static int __init acornscsi_init(void)
3117{
3118 return ecard_register_driver(&acornscsi_driver);
3119}
3120
3121static void __exit acornscsi_exit(void)
3122{
3123 ecard_remove_driver(&acornscsi_driver);
3124}
3125
3126module_init(acornscsi_init);
3127module_exit(acornscsi_exit);
3128
3129MODULE_AUTHOR("Russell King");
3130MODULE_DESCRIPTION("AcornSCSI driver");
3131MODULE_LICENSE("GPL");
Clone of davem's net-next-2.6 tree