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acornscsi: remove linked command support
[deliverable/linux.git] / drivers / scsi / arm / acornscsi.c
CommitLineData
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
1da177e4
LT		 64/*
65 * SCSI-II Synchronous transfer support.
66 *
67 * Tried and tested...
68 *
69 * SDTR_SIZE - maximum number of un-acknowledged bytes (0 = off, 12 = max)
70 * SDTR_PERIOD - period of REQ signal (min=125, max=1020)
71 * DEFAULT_PERIOD - default REQ period.
72 */
73#define SDTR_SIZE 12
74#define SDTR_PERIOD 125
75#define DEFAULT_PERIOD 500
76
77/*
78 * Debugging information
79 *
80 * DEBUG - bit mask from list above
81 * DEBUG_TARGET - is defined to the target number if you want to debug
82 * a specific target. [only recon/write/dma].
83 */
84#define DEBUG (DEBUG_RESET|DEBUG_WRITE|DEBUG_NO_WRITE)
85/* only allow writing to SCSI device 0 */
86#define NO_WRITE 0xFE
87/*#define DEBUG_TARGET 2*/
88/*
89 * Select timeout time (in 10ms units)
90 *
91 * This is the timeout used between the start of selection and the WD33C93
92 * chip deciding that the device isn't responding.
93 */
94#define TIMEOUT_TIME 10
95/*
25985edc 96 * Define this if you want to have verbose explanation of SCSI
1da177e4
LT		 97 * status/messages.
98 */
99#undef CONFIG_ACORNSCSI_CONSTANTS
100/*
101 * Define this if you want to use the on board DMAC [don't remove this option]
102 * If not set, then use PIO mode (not currently supported).
103 */
104#define USE_DMAC
105
106/*
107 * ====================================================================================
108 */
109
110#ifdef DEBUG_TARGET
111#define DBG(cmd,xxx...) \
112 if (cmd->device->id == DEBUG_TARGET) { \
113 xxx; \
114 }
115#else
116#define DBG(cmd,xxx...) xxx
117#endif
118
1da177e4
LT		 119#include <linux/module.h>
120#include <linux/kernel.h>
1da177e4
LT		 121#include <linux/string.h>
122#include <linux/signal.h>
123#include <linux/errno.h>
124#include <linux/proc_fs.h>
125#include <linux/ioport.h>
126#include <linux/blkdev.h>
127#include <linux/delay.h>
128#include <linux/interrupt.h>
129#include <linux/init.h>
130#include <linux/bitops.h>
a796ef70 131#include <linux/stringify.h>
e95a1b65 132#include <linux/io.h>
1da177e4 133
1da177e4
LT		 134#include <asm/ecard.h>
135
136#include "../scsi.h"
db9dff36 137#include <scsi/scsi_dbg.h>
1da177e4 138#include <scsi/scsi_host.h>
1abfd370 139#include <scsi/scsi_transport_spi.h>
1da177e4
LT		 140#include "acornscsi.h"
141#include "msgqueue.h"
142#include "scsi.h"
143
144#include <scsi/scsicam.h>
145
146#define VER_MAJOR 2
147#define VER_MINOR 0
148#define VER_PATCH 6
149
150#ifndef ABORT_TAG
151#define ABORT_TAG 0xd
152#else
153#error "Yippee! ABORT TAG is now defined! Remove this error!"
154#endif
155
1da177e4
LT		 156#ifdef USE_DMAC
157/*
158 * DMAC setup parameters
159 */
160#define INIT_DEVCON0 (DEVCON0_RQL|DEVCON0_EXW|DEVCON0_CMP)
161#define INIT_DEVCON1 (DEVCON1_BHLD)
162#define DMAC_READ (MODECON_READ)
163#define DMAC_WRITE (MODECON_WRITE)
164#define INIT_SBICDMA (CTRL_DMABURST)
165
166#define scsi_xferred have_data_in
167
168/*
169 * Size of on-board DMA buffer
170 */
171#define DMAC_BUFFER_SIZE 65536
172#endif
173
174#define STATUS_BUFFER_TO_PRINT 24
175
176unsigned int sdtr_period = SDTR_PERIOD;
177unsigned int sdtr_size = SDTR_SIZE;
178
ee0ca6ba
H		 179static void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp,
180 unsigned int result);
1da177e4
LT		 181static int acornscsi_reconnect_finish(AS_Host *host);
182static void acornscsi_dma_cleanup(AS_Host *host);
183static void acornscsi_abortcmd(AS_Host *host, unsigned char tag);
184
185/* ====================================================================================
186 * Miscellaneous
187 */
188
e95a1b65
RK		 189/* Offsets from MEMC base */
190#define SBIC_REGIDX 0x2000
191#define SBIC_REGVAL 0x2004
192#define DMAC_OFFSET 0x3000
193
194/* Offsets from FAST IOC base */
195#define INT_REG 0x2000
196#define PAGE_REG 0x3000
197
ffd7858d 198static inline void sbic_arm_write(AS_Host *host, unsigned int reg, unsigned int value)
1da177e4 199{
e95a1b65
RK		 200 writeb(reg, host->base + SBIC_REGIDX);
201 writeb(value, host->base + SBIC_REGVAL);
1da177e4
LT		 202}
203
ffd7858d 204static inline int sbic_arm_read(AS_Host *host, unsigned int reg)
1da177e4
LT		 205{
206 if(reg == SBIC_ASR)
e95a1b65
RK		 207 return readl(host->base + SBIC_REGIDX) & 255;
208 writeb(reg, host->base + SBIC_REGIDX);
209 return readl(host->base + SBIC_REGVAL) & 255;
1da177e4
LT		 210}
211
e95a1b65
RK		 212#define sbic_arm_writenext(host, val) writeb((val), (host)->base + SBIC_REGVAL)
213#define sbic_arm_readnext(host) readb((host)->base + SBIC_REGVAL)
1da177e4
LT		 214
215#ifdef USE_DMAC
ffd7858d 216#define dmac_read(host,reg) \
e95a1b65 217 readb((host)->base + DMAC_OFFSET + ((reg) << 2))
1da177e4 218
ffd7858d 219#define dmac_write(host,reg,value) \
e95a1b65 220 ({ writeb((value), (host)->base + DMAC_OFFSET + ((reg) << 2)); })
1da177e4 221
e95a1b65 222#define dmac_clearintr(host) writeb(0, (host)->fast + INT_REG)
1da177e4 223
ffd7858d 224static inline unsigned int dmac_address(AS_Host *host)
1da177e4 225{
ffd7858d
RK		 226 return dmac_read(host, DMAC_TXADRHI) << 16 |
227 dmac_read(host, DMAC_TXADRMD) << 8 |
228 dmac_read(host, DMAC_TXADRLO);
1da177e4
LT		 229}
230
231static
232void acornscsi_dumpdma(AS_Host *host, char *where)
233{
234 unsigned int mode, addr, len;
235
ffd7858d
RK		 236 mode = dmac_read(host, DMAC_MODECON);
237 addr = dmac_address(host);
238 len = dmac_read(host, DMAC_TXCNTHI) << 8 |
239 dmac_read(host, DMAC_TXCNTLO);
1da177e4
LT		 240
241 printk("scsi%d: %s: DMAC %02x @%06x+%04x msk %02x, ",
242 host->host->host_no, where,
243 mode, addr, (len + 1) & 0xffff,
ffd7858d 244 dmac_read(host, DMAC_MASKREG));
1da177e4
LT		 245
246 printk("DMA @%06x, ", host->dma.start_addr);
247 printk("BH @%p +%04x, ", host->scsi.SCp.ptr,
248 host->scsi.SCp.this_residual);
249 printk("DT @+%04x ST @+%04x", host->dma.transferred,
250 host->scsi.SCp.scsi_xferred);
251 printk("\n");
252}
253#endif
254
255static
256unsigned long acornscsi_sbic_xfcount(AS_Host *host)
257{
258 unsigned long length;
259
ffd7858d
RK		 260 length = sbic_arm_read(host, SBIC_TRANSCNTH) << 16;
261 length |= sbic_arm_readnext(host) << 8;
262 length |= sbic_arm_readnext(host);
1da177e4
LT		 263
264 return length;
265}
266
267static int
268acornscsi_sbic_wait(AS_Host *host, int stat_mask, int stat, int timeout, char *msg)
269{
270 int asr;
271
272 do {
ffd7858d 273 asr = sbic_arm_read(host, SBIC_ASR);
1da177e4
LT		 274
275 if ((asr & stat_mask) == stat)
276 return 0;
277
278 udelay(1);
279 } while (--timeout);
280
281 printk("scsi%d: timeout while %s\n", host->host->host_no, msg);
282
283 return -1;
284}
285
286static
287int acornscsi_sbic_issuecmd(AS_Host *host, int command)
288{
289 if (acornscsi_sbic_wait(host, ASR_CIP, 0, 1000, "issuing command"))
290 return -1;
291
ffd7858d 292 sbic_arm_write(host, SBIC_CMND, command);
1da177e4
LT		 293
294 return 0;
295}
296
297static void
298acornscsi_csdelay(unsigned int cs)
299{
300 unsigned long target_jiffies, flags;
301
302 target_jiffies = jiffies + 1 + cs * HZ / 100;
303
304 local_save_flags(flags);
305 local_irq_enable();
306
307 while (time_before(jiffies, target_jiffies)) barrier();
308
309 local_irq_restore(flags);
310}
311
312static
313void acornscsi_resetcard(AS_Host *host)
314{
315 unsigned int i, timeout;
316
317 /* assert reset line */
318 host->card.page_reg = 0x80;
e95a1b65 319 writeb(host->card.page_reg, host->fast + PAGE_REG);
1da177e4
LT		 320
321 /* wait 3 cs. SCSI standard says 25ms. */
322 acornscsi_csdelay(3);
323
324 host->card.page_reg = 0;
e95a1b65 325 writeb(host->card.page_reg, host->fast + PAGE_REG);
1da177e4
LT		 326
327 /*
328 * Should get a reset from the card
329 */
330 timeout = 1000;
331 do {
e95a1b65 332 if (readb(host->fast + INT_REG) & 8)
1da177e4
LT		 333 break;
334 udelay(1);
335 } while (--timeout);
336
337 if (timeout == 0)
338 printk("scsi%d: timeout while resetting card\n",
339 host->host->host_no);
340
ffd7858d
RK		 341 sbic_arm_read(host, SBIC_ASR);
342 sbic_arm_read(host, SBIC_SSR);
1da177e4
LT		 343
344 /* setup sbic - WD33C93A */
ffd7858d
RK		 345 sbic_arm_write(host, SBIC_OWNID, OWNID_EAF | host->host->this_id);
346 sbic_arm_write(host, SBIC_CMND, CMND_RESET);
1da177e4
LT		 347
348 /*
349 * Command should cause a reset interrupt
350 */
351 timeout = 1000;
352 do {
e95a1b65 353 if (readb(host->fast + INT_REG) & 8)
1da177e4
LT		 354 break;
355 udelay(1);
356 } while (--timeout);
357
358 if (timeout == 0)
359 printk("scsi%d: timeout while resetting card\n",
360 host->host->host_no);
361
ffd7858d
RK		 362 sbic_arm_read(host, SBIC_ASR);
363 if (sbic_arm_read(host, SBIC_SSR) != 0x01)
1da177e4
LT		 364 printk(KERN_CRIT "scsi%d: WD33C93A didn't give enhanced reset interrupt\n",
365 host->host->host_no);
366
ffd7858d
RK		 367 sbic_arm_write(host, SBIC_CTRL, INIT_SBICDMA | CTRL_IDI);
368 sbic_arm_write(host, SBIC_TIMEOUT, TIMEOUT_TIME);
369 sbic_arm_write(host, SBIC_SYNCHTRANSFER, SYNCHTRANSFER_2DBA);
370 sbic_arm_write(host, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP);
1da177e4
LT		 371
372 host->card.page_reg = 0x40;
e95a1b65 373 writeb(host->card.page_reg, host->fast + PAGE_REG);
1da177e4
LT		 374
375 /* setup dmac - uPC71071 */
ffd7858d 376 dmac_write(host, DMAC_INIT, 0);
1da177e4 377#ifdef USE_DMAC
ffd7858d
RK		 378 dmac_write(host, DMAC_INIT, INIT_8BIT);
379 dmac_write(host, DMAC_CHANNEL, CHANNEL_0);
380 dmac_write(host, DMAC_DEVCON0, INIT_DEVCON0);
381 dmac_write(host, DMAC_DEVCON1, INIT_DEVCON1);
1da177e4
LT		 382#endif
383
384 host->SCpnt = NULL;
385 host->scsi.phase = PHASE_IDLE;
386 host->scsi.disconnectable = 0;
387
388 memset(host->busyluns, 0, sizeof(host->busyluns));
389
390 for (i = 0; i < 8; i++) {
391 host->device[i].sync_state = SYNC_NEGOCIATE;
392 host->device[i].disconnect_ok = 1;
393 }
394
395 /* wait 25 cs. SCSI standard says 250ms. */
396 acornscsi_csdelay(25);
397}
398
399/*=============================================================================================
400 * Utility routines (eg. debug)
401 */
402#ifdef CONFIG_ACORNSCSI_CONSTANTS
403static char *acornscsi_interrupttype[] = {
404 "rst", "suc", "p/a", "3",
405 "term", "5", "6", "7",
406 "serv", "9", "a", "b",
407 "c", "d", "e", "f"
408};
409
410static signed char acornscsi_map[] = {
411 0, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
412 -1, 2, -1, -1, -1, -1, 3, -1, 4, 5, 6, 7, 8, 9, 10, 11,
413 12, 13, 14, -1, -1, -1, -1, -1, 4, 5, 6, 7, 8, 9, 10, 11,
414 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
415 15, 16, 17, 18, 19, -1, -1, 20, 4, 5, 6, 7, 8, 9, 10, 11,
416 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
417 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
418 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
419 21, 22, -1, -1, -1, 23, -1, -1, 4, 5, 6, 7, 8, 9, 10, 11,
420 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
421 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
422 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
423 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
424 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
425 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
426 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
427};
428
429static char *acornscsi_interruptcode[] = {
430 /* 0 */
431 "reset - normal mode", /* 00 */
432 "reset - advanced mode", /* 01 */
433
434 /* 2 */
435 "sel", /* 11 */
436 "sel+xfer", /* 16 */
437 "data-out", /* 18 */
438 "data-in", /* 19 */
439 "cmd", /* 1A */
440 "stat", /* 1B */
441 "??-out", /* 1C */
442 "??-in", /* 1D */
443 "msg-out", /* 1E */
444 "msg-in", /* 1F */
445
446 /* 12 */
447 "/ACK asserted", /* 20 */
448 "save-data-ptr", /* 21 */
449 "{re}sel", /* 22 */
450
451 /* 15 */
452 "inv cmd", /* 40 */
453 "unexpected disconnect", /* 41 */
454 "sel timeout", /* 42 */
455 "P err", /* 43 */
456 "P err+ATN", /* 44 */
457 "bad status byte", /* 47 */
458
459 /* 21 */
460 "resel, no id", /* 80 */
461 "resel", /* 81 */
462 "discon", /* 85 */
463};
464
465static
466void print_scsi_status(unsigned int ssr)
467{
468 if (acornscsi_map[ssr] != -1)
469 printk("%s:%s",
470 acornscsi_interrupttype[(ssr >> 4)],
471 acornscsi_interruptcode[acornscsi_map[ssr]]);
472 else
473 printk("%X:%X", ssr >> 4, ssr & 0x0f);
474}
475#endif
476
477static
478void print_sbic_status(int asr, int ssr, int cmdphase)
479{
480#ifdef CONFIG_ACORNSCSI_CONSTANTS
481 printk("sbic: %c%c%c%c%c%c ",
482 asr & ASR_INT ? 'I' : 'i',
483 asr & ASR_LCI ? 'L' : 'l',
484 asr & ASR_BSY ? 'B' : 'b',
485 asr & ASR_CIP ? 'C' : 'c',
486 asr & ASR_PE ? 'P' : 'p',
487 asr & ASR_DBR ? 'D' : 'd');
488 printk("scsi: ");
489 print_scsi_status(ssr);
490 printk(" ph %02X\n", cmdphase);
491#else
492 printk("sbic: %02X scsi: %X:%X ph: %02X\n",
493 asr, (ssr & 0xf0)>>4, ssr & 0x0f, cmdphase);
494#endif
495}
496
497static void
498acornscsi_dumplogline(AS_Host *host, int target, int line)
499{
500 unsigned long prev;
501 signed int ptr;
502
503 ptr = host->status_ptr[target] - STATUS_BUFFER_TO_PRINT;
504 if (ptr < 0)
505 ptr += STATUS_BUFFER_SIZE;
506
507 printk("%c: %3s:", target == 8 ? 'H' : '0' + target,
508 line == 0 ? "ph" : line == 1 ? "ssr" : "int");
509
510 prev = host->status[target][ptr].when;
511
512 for (; ptr != host->status_ptr[target]; ptr = (ptr + 1) & (STATUS_BUFFER_SIZE - 1)) {
513 unsigned long time_diff;
514
515 if (!host->status[target][ptr].when)
516 continue;
517
518 switch (line) {
519 case 0:
520 printk("%c%02X", host->status[target][ptr].irq ? '-' : ' ',
521 host->status[target][ptr].ph);
522 break;
523
524 case 1:
525 printk(" %02X", host->status[target][ptr].ssr);
526 break;
527
528 case 2:
529 time_diff = host->status[target][ptr].when - prev;
530 prev = host->status[target][ptr].when;
531 if (time_diff == 0)
532 printk("==^");
533 else if (time_diff >= 100)
534 printk(" ");
535 else
536 printk(" %02ld", time_diff);
537 break;
538 }
539 }
540
541 printk("\n");
542}
543
544static
545void acornscsi_dumplog(AS_Host *host, int target)
546{
547 do {
548 acornscsi_dumplogline(host, target, 0);
549 acornscsi_dumplogline(host, target, 1);
550 acornscsi_dumplogline(host, target, 2);
551
552 if (target == 8)
553 break;
554
555 target = 8;
556 } while (1);
557}
558
559static
560char acornscsi_target(AS_Host *host)
561{
562 if (host->SCpnt)
563 return '0' + host->SCpnt->device->id;
564 return 'H';
565}
566
567/*
568 * Prototype: cmdtype_t acornscsi_cmdtype(int command)
569 * Purpose : differentiate READ from WRITE from other commands
570 * Params : command - command to interpret
571 * Returns : CMD_READ - command reads data,
572 * CMD_WRITE - command writes data,
573 * CMD_MISC - everything else
574 */
575static inline
576cmdtype_t acornscsi_cmdtype(int command)
577{
578 switch (command) {
579 case WRITE_6: case WRITE_10: case WRITE_12:
580 return CMD_WRITE;
581 case READ_6: case READ_10: case READ_12:
582 return CMD_READ;
583 default:
584 return CMD_MISC;
585 }
586}
587
588/*
589 * Prototype: int acornscsi_datadirection(int command)
590 * Purpose : differentiate between commands that have a DATA IN phase
591 * and a DATA OUT phase
592 * Params : command - command to interpret
593 * Returns : DATADIR_OUT - data out phase expected
594 * DATADIR_IN - data in phase expected
595 */
596static
597datadir_t acornscsi_datadirection(int command)
598{
599 switch (command) {
600 case CHANGE_DEFINITION: case COMPARE: case COPY:
601 case COPY_VERIFY: case LOG_SELECT: case MODE_SELECT:
602 case MODE_SELECT_10: case SEND_DIAGNOSTIC: case WRITE_BUFFER:
603 case FORMAT_UNIT: case REASSIGN_BLOCKS: case RESERVE:
604 case SEARCH_EQUAL: case SEARCH_HIGH: case SEARCH_LOW:
605 case WRITE_6: case WRITE_10: case WRITE_VERIFY:
606 case UPDATE_BLOCK: case WRITE_LONG: case WRITE_SAME:
607 case SEARCH_HIGH_12: case SEARCH_EQUAL_12: case SEARCH_LOW_12:
608 case WRITE_12: case WRITE_VERIFY_12: case SET_WINDOW:
609 case MEDIUM_SCAN: case SEND_VOLUME_TAG: case 0xea:
610 return DATADIR_OUT;
611 default:
612 return DATADIR_IN;
613 }
614}
615
616/*
617 * Purpose : provide values for synchronous transfers with 33C93.
618 * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting
619 * Modified by Russell King for 8MHz WD33C93A
620 */
621static struct sync_xfer_tbl {
622 unsigned int period_ns;
623 unsigned char reg_value;
624} sync_xfer_table[] = {
625 { 1, 0x20 }, { 249, 0x20 }, { 374, 0x30 },
626 { 499, 0x40 }, { 624, 0x50 }, { 749, 0x60 },
627 { 874, 0x70 }, { 999, 0x00 }, { 0, 0 }
628};
629
630/*
631 * Prototype: int acornscsi_getperiod(unsigned char syncxfer)
632 * Purpose : period for the synchronous transfer setting
633 * Params : syncxfer SYNCXFER register value
634 * Returns : period in ns.
635 */
636static
637int acornscsi_getperiod(unsigned char syncxfer)
638{
639 int i;
640
641 syncxfer &= 0xf0;
642 if (syncxfer == 0x10)
643 syncxfer = 0;
644
645 for (i = 1; sync_xfer_table[i].period_ns; i++)
646 if (syncxfer == sync_xfer_table[i].reg_value)
647 return sync_xfer_table[i].period_ns;
648 return 0;
649}
650
651/*
652 * Prototype: int round_period(unsigned int period)
653 * Purpose : return index into above table for a required REQ period
654 * Params : period - time (ns) for REQ
655 * Returns : table index
656 * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting
657 */
658static inline
659int round_period(unsigned int period)
660{
661 int i;
662
663 for (i = 1; sync_xfer_table[i].period_ns; i++) {
664 if ((period <= sync_xfer_table[i].period_ns) &&
665 (period > sync_xfer_table[i - 1].period_ns))
666 return i;
667 }
668 return 7;
669}
670
671/*
672 * Prototype: unsigned char calc_sync_xfer(unsigned int period, unsigned int offset)
673 * Purpose : calculate value for 33c93s SYNC register
674 * Params : period - time (ns) for REQ
675 * offset - offset in bytes between REQ/ACK
676 * Returns : value for SYNC register
677 * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting
678 */
679static
680unsigned char calc_sync_xfer(unsigned int period, unsigned int offset)
681{
682 return sync_xfer_table[round_period(period)].reg_value |
683 ((offset < SDTR_SIZE) ? offset : SDTR_SIZE);
684}
685
686/* ====================================================================================
687 * Command functions
688 */
689/*
690 * Function: acornscsi_kick(AS_Host *host)
691 * Purpose : kick next command to interface
692 * Params : host - host to send command to
693 * Returns : INTR_IDLE if idle, otherwise INTR_PROCESSING
694 * Notes : interrupts are always disabled!
695 */
696static
697intr_ret_t acornscsi_kick(AS_Host *host)
698{
699 int from_queue = 0;
ee0ca6ba 700 struct scsi_cmnd *SCpnt;
1da177e4
LT		 701
702 /* first check to see if a command is waiting to be executed */
703 SCpnt = host->origSCpnt;
704 host->origSCpnt = NULL;
705
706 /* retrieve next command */
707 if (!SCpnt) {
708 SCpnt = queue_remove_exclude(&host->queues.issue, host->busyluns);
709 if (!SCpnt)
710 return INTR_IDLE;
711
712 from_queue = 1;
713 }
714
715 if (host->scsi.disconnectable && host->SCpnt) {
716 queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt);
717 host->scsi.disconnectable = 0;
718#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
719 DBG(host->SCpnt, printk("scsi%d.%c: moved command to disconnected queue\n",
720 host->host->host_no, acornscsi_target(host)));
721#endif
722 host->SCpnt = NULL;
723 }
724
725 /*
726 * If we have an interrupt pending, then we may have been reselected.
727 * In this case, we don't want to write to the registers
728 */
ffd7858d
RK		 729 if (!(sbic_arm_read(host, SBIC_ASR) & (ASR_INT|ASR_BSY|ASR_CIP))) {
730 sbic_arm_write(host, SBIC_DESTID, SCpnt->device->id);
731 sbic_arm_write(host, SBIC_CMND, CMND_SELWITHATN);
1da177e4
LT		 732 }
733
734 /*
735 * claim host busy - all of these must happen atomically wrt
736 * our interrupt routine. Failure means command loss.
737 */
738 host->scsi.phase = PHASE_CONNECTING;
739 host->SCpnt = SCpnt;
740 host->scsi.SCp = SCpnt->SCp;
741 host->dma.xfer_setup = 0;
742 host->dma.xfer_required = 0;
743 host->dma.xfer_done = 0;
744
745#if (DEBUG & (DEBUG_ABORT|DEBUG_CONNECT))
746 DBG(SCpnt,printk("scsi%d.%c: starting cmd %02X\n",
747 host->host->host_no, '0' + SCpnt->device->id,
748 SCpnt->cmnd[0]));
749#endif
750
751 if (from_queue) {
752#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
753 /*
754 * tagged queueing - allocate a new tag to this command
755 */
756 if (SCpnt->device->simple_tags) {
757 SCpnt->device->current_tag += 1;
758 if (SCpnt->device->current_tag == 0)
759 SCpnt->device->current_tag = 1;
760 SCpnt->tag = SCpnt->device->current_tag;
761 } else
762#endif
763 set_bit(SCpnt->device->id * 8 + SCpnt->device->lun, host->busyluns);
764
765 host->stats.removes += 1;
766
767 switch (acornscsi_cmdtype(SCpnt->cmnd[0])) {
768 case CMD_WRITE:
769 host->stats.writes += 1;
770 break;
771 case CMD_READ:
772 host->stats.reads += 1;
773 break;
774 case CMD_MISC:
775 host->stats.miscs += 1;
776 break;
777 }
778 }
779
780 return INTR_PROCESSING;
781}
782
783/*
ee0ca6ba 784 * Function: void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp, unsigned int result)
1da177e4
LT		 785 * Purpose : complete processing for command
786 * Params : host - interface that completed
787 * result - driver byte of result
788 */
ee0ca6ba
H		 789static void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp,
790 unsigned int result)
1da177e4 791{
ee0ca6ba 792 struct scsi_cmnd *SCpnt = *SCpntp;
1da177e4
LT		 793
794 /* clean up */
ffd7858d 795 sbic_arm_write(host, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP);
1da177e4
LT		 796
797 host->stats.fins += 1;
798
799 if (SCpnt) {
800 *SCpntp = NULL;
801
802 acornscsi_dma_cleanup(host);
803
804 SCpnt->result = result << 16 | host->scsi.SCp.Message << 8 | host->scsi.SCp.Status;
805
806 /*
807 * In theory, this should not happen. In practice, it seems to.
808 * Only trigger an error if the device attempts to report all happy
809 * but with untransferred buffers... If we don't do something, then
810 * data loss will occur. Should we check SCpnt->underflow here?
811 * It doesn't appear to be set to something meaningful by the higher
812 * levels all the time.
813 */
814 if (result == DID_OK) {
815 int xfer_warn = 0;
816
817 if (SCpnt->underflow == 0) {
818 if (host->scsi.SCp.ptr &&
819 acornscsi_cmdtype(SCpnt->cmnd[0]) != CMD_MISC)
820 xfer_warn = 1;
821 } else {
822 if (host->scsi.SCp.scsi_xferred < SCpnt->underflow ||
823 host->scsi.SCp.scsi_xferred != host->dma.transferred)
824 xfer_warn = 1;
825 }
826
827 /* ANSI standard says: (SCSI-2 Rev 10c Sect 5.6.6)
828 * Targets which break data transfers into multiple
829 * connections shall end each successful connection
830 * (except possibly the last) with a SAVE DATA
831 * POINTER - DISCONNECT message sequence.
832 *
833 * This makes it difficult to ensure that a transfer has
834 * completed. If we reach the end of a transfer during
835 * the command, then we can only have finished the transfer.
836 * therefore, if we seem to have some data remaining, this
837 * is not a problem.
838 */
839 if (host->dma.xfer_done)
840 xfer_warn = 0;
841
842 if (xfer_warn) {
843 switch (status_byte(SCpnt->result)) {
844 case CHECK_CONDITION:
845 case COMMAND_TERMINATED:
846 case BUSY:
847 case QUEUE_FULL:
848 case RESERVATION_CONFLICT:
849 break;
850
851 default:
852 printk(KERN_ERR "scsi%d.H: incomplete data transfer detected: result=%08X command=",
853 host->host->host_no, SCpnt->result);
db9dff36 854 __scsi_print_command(SCpnt->cmnd);
1da177e4
LT		 855 acornscsi_dumpdma(host, "done");
856 acornscsi_dumplog(host, SCpnt->device->id);
857 SCpnt->result &= 0xffff;
858 SCpnt->result |= DID_ERROR << 16;
859 }
860 }
861 }
862
863 if (!SCpnt->scsi_done)
864 panic("scsi%d.H: null scsi_done function in acornscsi_done", host->host->host_no);
865
866 clear_bit(SCpnt->device->id * 8 + SCpnt->device->lun, host->busyluns);
867
868 SCpnt->scsi_done(SCpnt);
869 } else
870 printk("scsi%d: null command in acornscsi_done", host->host->host_no);
871
872 host->scsi.phase = PHASE_IDLE;
873}
874
875/* ====================================================================================
876 * DMA routines
877 */
878/*
879 * Purpose : update SCSI Data Pointer
880 * Notes : this will only be one SG entry or less
881 */
882static
0a04137e 883void acornscsi_data_updateptr(AS_Host *host, struct scsi_pointer *SCp, unsigned int length)
1da177e4
LT		 884{
885 SCp->ptr += length;
886 SCp->this_residual -= length;
887
888 if (SCp->this_residual == 0 && next_SCp(SCp) == 0)
889 host->dma.xfer_done = 1;
890}
891
892/*
893 * Prototype: void acornscsi_data_read(AS_Host *host, char *ptr,
894 * unsigned int start_addr, unsigned int length)
895 * Purpose : read data from DMA RAM
896 * Params : host - host to transfer from
897 * ptr - DRAM address
898 * start_addr - host mem address
899 * length - number of bytes to transfer
900 * Notes : this will only be one SG entry or less
901 */
902static
903void acornscsi_data_read(AS_Host *host, char *ptr,
904 unsigned int start_addr, unsigned int length)
905{
e95a1b65 906 extern void __acornscsi_in(void __iomem *, char *buf, int len);
1da177e4
LT		 907 unsigned int page, offset, len = length;
908
909 page = (start_addr >> 12);
910 offset = start_addr & ((1 << 12) - 1);
911
e95a1b65 912 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG);
1da177e4
LT		 913
914 while (len > 0) {
915 unsigned int this_len;
916
917 if (len + offset > (1 << 12))
918 this_len = (1 << 12) - offset;
919 else
920 this_len = len;
921
e95a1b65 922 __acornscsi_in(host->base + (offset << 1), ptr, this_len);
1da177e4
LT		 923
924 offset += this_len;
925 ptr += this_len;
926 len -= this_len;
927
928 if (offset == (1 << 12)) {
929 offset = 0;
930 page ++;
e95a1b65 931 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG);
1da177e4
LT		 932 }
933 }
e95a1b65 934 writeb(host->card.page_reg, host->fast + PAGE_REG);
1da177e4
LT		 935}
936
937/*
938 * Prototype: void acornscsi_data_write(AS_Host *host, char *ptr,
939 * unsigned int start_addr, unsigned int length)
940 * Purpose : write data to DMA RAM
941 * Params : host - host to transfer from
942 * ptr - DRAM address
943 * start_addr - host mem address
944 * length - number of bytes to transfer
945 * Notes : this will only be one SG entry or less
946 */
947static
948void acornscsi_data_write(AS_Host *host, char *ptr,
949 unsigned int start_addr, unsigned int length)
950{
e95a1b65 951 extern void __acornscsi_out(void __iomem *, char *buf, int len);
1da177e4
LT		 952 unsigned int page, offset, len = length;
953
954 page = (start_addr >> 12);
955 offset = start_addr & ((1 << 12) - 1);
956
e95a1b65 957 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG);
1da177e4
LT		 958
959 while (len > 0) {
960 unsigned int this_len;
961
962 if (len + offset > (1 << 12))
963 this_len = (1 << 12) - offset;
964 else
965 this_len = len;
966
e95a1b65 967 __acornscsi_out(host->base + (offset << 1), ptr, this_len);
1da177e4
LT		 968
969 offset += this_len;
970 ptr += this_len;
971 len -= this_len;
972
973 if (offset == (1 << 12)) {
974 offset = 0;
975 page ++;
e95a1b65 976 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG);
1da177e4
LT		 977 }
978 }
e95a1b65 979 writeb(host->card.page_reg, host->fast + PAGE_REG);
1da177e4
LT		 980}
981
982/* =========================================================================================
983 * On-board DMA routines
984 */
985#ifdef USE_DMAC
986/*
987 * Prototype: void acornscsi_dmastop(AS_Host *host)
988 * Purpose : stop all DMA
989 * Params : host - host on which to stop DMA
990 * Notes : This is called when leaving DATA IN/OUT phase,
991 * or when interface is RESET
992 */
993static inline
994void acornscsi_dma_stop(AS_Host *host)
995{
ffd7858d
RK		 996 dmac_write(host, DMAC_MASKREG, MASK_ON);
997 dmac_clearintr(host);
1da177e4
LT		 998
999#if (DEBUG & DEBUG_DMA)
1000 DBG(host->SCpnt, acornscsi_dumpdma(host, "stop"));
1001#endif
1002}
1003
1004/*
1005 * Function: void acornscsi_dma_setup(AS_Host *host, dmadir_t direction)
1006 * Purpose : setup DMA controller for data transfer
1007 * Params : host - host to setup
1008 * direction - data transfer direction
1009 * Notes : This is called when entering DATA I/O phase, not
1010 * while we're in a DATA I/O phase
1011 */
1012static
1013void acornscsi_dma_setup(AS_Host *host, dmadir_t direction)
1014{
1015 unsigned int address, length, mode;
1016
1017 host->dma.direction = direction;
1018
ffd7858d 1019 dmac_write(host, DMAC_MASKREG, MASK_ON);
1da177e4
LT		 1020
1021 if (direction == DMA_OUT) {
1022#if (DEBUG & DEBUG_NO_WRITE)
1023 if (NO_WRITE & (1 << host->SCpnt->device->id)) {
1024 printk(KERN_CRIT "scsi%d.%c: I can't handle DMA_OUT!\n",
1025 host->host->host_no, acornscsi_target(host));
1026 return;
1027 }
1028#endif
1029 mode = DMAC_WRITE;
1030 } else
1031 mode = DMAC_READ;
1032
1033 /*
1034 * Allocate some buffer space, limited to half the buffer size
1035 */
1036 length = min_t(unsigned int, host->scsi.SCp.this_residual, DMAC_BUFFER_SIZE / 2);
1037 if (length) {
1038 host->dma.start_addr = address = host->dma.free_addr;
1039 host->dma.free_addr = (host->dma.free_addr + length) &
1040 (DMAC_BUFFER_SIZE - 1);
1041
1042 /*
1043 * Transfer data to DMA memory
1044 */
1045 if (direction == DMA_OUT)
1046 acornscsi_data_write(host, host->scsi.SCp.ptr, host->dma.start_addr,
1047 length);
1048
1049 length -= 1;
ffd7858d
RK		 1050 dmac_write(host, DMAC_TXCNTLO, length);
1051 dmac_write(host, DMAC_TXCNTHI, length >> 8);
1052 dmac_write(host, DMAC_TXADRLO, address);
1053 dmac_write(host, DMAC_TXADRMD, address >> 8);
1054 dmac_write(host, DMAC_TXADRHI, 0);
1055 dmac_write(host, DMAC_MODECON, mode);
1056 dmac_write(host, DMAC_MASKREG, MASK_OFF);
1da177e4
LT		 1057
1058#if (DEBUG & DEBUG_DMA)
1059 DBG(host->SCpnt, acornscsi_dumpdma(host, "strt"));
1060#endif
1061 host->dma.xfer_setup = 1;
1062 }
1063}
1064
1065/*
1066 * Function: void acornscsi_dma_cleanup(AS_Host *host)
1067 * Purpose : ensure that all DMA transfers are up-to-date & host->scsi.SCp is correct
1068 * Params : host - host to finish
1069 * Notes : This is called when a command is:
1070 * terminating, RESTORE_POINTERS, SAVE_POINTERS, DISCONECT
1071 * : This must not return until all transfers are completed.
1072 */
1073static
1074void acornscsi_dma_cleanup(AS_Host *host)
1075{
ffd7858d
RK		 1076 dmac_write(host, DMAC_MASKREG, MASK_ON);
1077 dmac_clearintr(host);
1da177e4
LT		 1078
1079 /*
1080 * Check for a pending transfer
1081 */
1082 if (host->dma.xfer_required) {
1083 host->dma.xfer_required = 0;
1084 if (host->dma.direction == DMA_IN)
1085 acornscsi_data_read(host, host->dma.xfer_ptr,
1086 host->dma.xfer_start, host->dma.xfer_length);
1087 }
1088
1089 /*
1090 * Has a transfer been setup?
1091 */
1092 if (host->dma.xfer_setup) {
1093 unsigned int transferred;
1094
1095 host->dma.xfer_setup = 0;
1096
1097#if (DEBUG & DEBUG_DMA)
1098 DBG(host->SCpnt, acornscsi_dumpdma(host, "cupi"));
1099#endif
1100
1101 /*
1102 * Calculate number of bytes transferred from DMA.
1103 */
ffd7858d 1104 transferred = dmac_address(host) - host->dma.start_addr;
1da177e4
LT		 1105 host->dma.transferred += transferred;
1106
1107 if (host->dma.direction == DMA_IN)
1108 acornscsi_data_read(host, host->scsi.SCp.ptr,
1109 host->dma.start_addr, transferred);
1110
1111 /*
1112 * Update SCSI pointers
1113 */
1114 acornscsi_data_updateptr(host, &host->scsi.SCp, transferred);
1115#if (DEBUG & DEBUG_DMA)
1116 DBG(host->SCpnt, acornscsi_dumpdma(host, "cupo"));
1117#endif
1118 }
1119}
1120
1121/*
1122 * Function: void acornscsi_dmacintr(AS_Host *host)
1123 * Purpose : handle interrupts from DMAC device
1124 * Params : host - host to process
1125 * Notes : If reading, we schedule the read to main memory &
1126 * allow the transfer to continue.
1127 * : If writing, we fill the onboard DMA memory from main
1128 * memory.
1129 * : Called whenever DMAC finished it's current transfer.
1130 */
1131static
1132void acornscsi_dma_intr(AS_Host *host)
1133{
1134 unsigned int address, length, transferred;
1135
1136#if (DEBUG & DEBUG_DMA)
1137 DBG(host->SCpnt, acornscsi_dumpdma(host, "inti"));
1138#endif
1139
ffd7858d
RK		 1140 dmac_write(host, DMAC_MASKREG, MASK_ON);
1141 dmac_clearintr(host);
1da177e4
LT		 1142
1143 /*
1144 * Calculate amount transferred via DMA
1145 */
ffd7858d 1146 transferred = dmac_address(host) - host->dma.start_addr;
1da177e4
LT		 1147 host->dma.transferred += transferred;
1148
1149 /*
1150 * Schedule DMA transfer off board
1151 */
1152 if (host->dma.direction == DMA_IN) {
1153 host->dma.xfer_start = host->dma.start_addr;
1154 host->dma.xfer_length = transferred;
1155 host->dma.xfer_ptr = host->scsi.SCp.ptr;
1156 host->dma.xfer_required = 1;
1157 }
1158
1159 acornscsi_data_updateptr(host, &host->scsi.SCp, transferred);
1160
1161 /*
1162 * Allocate some buffer space, limited to half the on-board RAM size
1163 */
1164 length = min_t(unsigned int, host->scsi.SCp.this_residual, DMAC_BUFFER_SIZE / 2);
1165 if (length) {
1166 host->dma.start_addr = address = host->dma.free_addr;
1167 host->dma.free_addr = (host->dma.free_addr + length) &
1168 (DMAC_BUFFER_SIZE - 1);
1169
1170 /*
1171 * Transfer data to DMA memory
1172 */
1173 if (host->dma.direction == DMA_OUT)
1174 acornscsi_data_write(host, host->scsi.SCp.ptr, host->dma.start_addr,
1175 length);
1176
1177 length -= 1;
ffd7858d
RK		 1178 dmac_write(host, DMAC_TXCNTLO, length);
1179 dmac_write(host, DMAC_TXCNTHI, length >> 8);
1180 dmac_write(host, DMAC_TXADRLO, address);
1181 dmac_write(host, DMAC_TXADRMD, address >> 8);
1182 dmac_write(host, DMAC_TXADRHI, 0);
1183 dmac_write(host, DMAC_MASKREG, MASK_OFF);
1da177e4
LT		 1184
1185#if (DEBUG & DEBUG_DMA)
1186 DBG(host->SCpnt, acornscsi_dumpdma(host, "into"));
1187#endif
1188 } else {
1189 host->dma.xfer_setup = 0;
1190#if 0
1191 /*
1192 * If the interface still wants more, then this is an error.
1193 * We give it another byte, but we also attempt to raise an
1194 * attention condition. We continue giving one byte until
1195 * the device recognises the attention.
1196 */
ffd7858d 1197 if (dmac_read(host, DMAC_STATUS) & STATUS_RQ0) {
1da177e4
LT		 1198 acornscsi_abortcmd(host, host->SCpnt->tag);
1199
ffd7858d
RK		 1200 dmac_write(host, DMAC_TXCNTLO, 0);
1201 dmac_write(host, DMAC_TXCNTHI, 0);
1202 dmac_write(host, DMAC_TXADRLO, 0);
1203 dmac_write(host, DMAC_TXADRMD, 0);
1204 dmac_write(host, DMAC_TXADRHI, 0);
1205 dmac_write(host, DMAC_MASKREG, MASK_OFF);
1da177e4
LT		 1206 }
1207#endif
1208 }
1209}
1210
1211/*
1212 * Function: void acornscsi_dma_xfer(AS_Host *host)
1213 * Purpose : transfer data between AcornSCSI and memory
1214 * Params : host - host to process
1215 */
1216static
1217void acornscsi_dma_xfer(AS_Host *host)
1218{
1219 host->dma.xfer_required = 0;
1220
1221 if (host->dma.direction == DMA_IN)
1222 acornscsi_data_read(host, host->dma.xfer_ptr,
1223 host->dma.xfer_start, host->dma.xfer_length);
1224}
1225
1226/*
1227 * Function: void acornscsi_dma_adjust(AS_Host *host)
1228 * Purpose : adjust DMA pointers & count for bytes transferred to
1229 * SBIC but not SCSI bus.
1230 * Params : host - host to adjust DMA count for
1231 */
1232static
1233void acornscsi_dma_adjust(AS_Host *host)
1234{
1235 if (host->dma.xfer_setup) {
1236 signed long transferred;
1237#if (DEBUG & (DEBUG_DMA|DEBUG_WRITE))
1238 DBG(host->SCpnt, acornscsi_dumpdma(host, "adji"));
1239#endif
1240 /*
1241 * Calculate correct DMA address - DMA is ahead of SCSI bus while
1242 * writing.
1243 * host->scsi.SCp.scsi_xferred is the number of bytes
1244 * actually transferred to/from the SCSI bus.
1245 * host->dma.transferred is the number of bytes transferred
1246 * over DMA since host->dma.start_addr was last set.
1247 *
1248 * real_dma_addr = host->dma.start_addr + host->scsi.SCp.scsi_xferred
1249 * - host->dma.transferred
1250 */
1251 transferred = host->scsi.SCp.scsi_xferred - host->dma.transferred;
1252 if (transferred < 0)
1253 printk("scsi%d.%c: Ack! DMA write correction %ld < 0!\n",
1254 host->host->host_no, acornscsi_target(host), transferred);
1255 else if (transferred == 0)
1256 host->dma.xfer_setup = 0;
1257 else {
1258 transferred += host->dma.start_addr;
ffd7858d
RK		 1259 dmac_write(host, DMAC_TXADRLO, transferred);
1260 dmac_write(host, DMAC_TXADRMD, transferred >> 8);
1261 dmac_write(host, DMAC_TXADRHI, transferred >> 16);
1da177e4
LT		 1262#if (DEBUG & (DEBUG_DMA|DEBUG_WRITE))
1263 DBG(host->SCpnt, acornscsi_dumpdma(host, "adjo"));
1264#endif
1265 }
1266 }
1267}
1268#endif
1269
1270/* =========================================================================================
1271 * Data I/O
1272 */
1273static int
1274acornscsi_write_pio(AS_Host *host, char *bytes, int *ptr, int len, unsigned int max_timeout)
1275{
1276 unsigned int asr, timeout = max_timeout;
1277 int my_ptr = *ptr;
1278
1279 while (my_ptr < len) {
ffd7858d 1280 asr = sbic_arm_read(host, SBIC_ASR);
1da177e4
LT		 1281
1282 if (asr & ASR_DBR) {
1283 timeout = max_timeout;
1284
ffd7858d 1285 sbic_arm_write(host, SBIC_DATA, bytes[my_ptr++]);
1da177e4
LT		 1286 } else if (asr & ASR_INT)
1287 break;
1288 else if (--timeout == 0)
1289 break;
1290 udelay(1);
1291 }
1292
1293 *ptr = my_ptr;
1294
1295 return (timeout == 0) ? -1 : 0;
1296}
1297
1298/*
1299 * Function: void acornscsi_sendcommand(AS_Host *host)
1300 * Purpose : send a command to a target
1301 * Params : host - host which is connected to target
1302 */
1303static void
1304acornscsi_sendcommand(AS_Host *host)
1305{
ee0ca6ba 1306 struct scsi_cmnd *SCpnt = host->SCpnt;
1da177e4 1307
ffd7858d
RK		 1308 sbic_arm_write(host, SBIC_TRANSCNTH, 0);
1309 sbic_arm_writenext(host, 0);
1310 sbic_arm_writenext(host, SCpnt->cmd_len - host->scsi.SCp.sent_command);
1da177e4
LT		 1311
1312 acornscsi_sbic_issuecmd(host, CMND_XFERINFO);
1313
1314 if (acornscsi_write_pio(host, SCpnt->cmnd,
1315 (int *)&host->scsi.SCp.sent_command, SCpnt->cmd_len, 1000000))
1316 printk("scsi%d: timeout while sending command\n", host->host->host_no);
1317
1318 host->scsi.phase = PHASE_COMMAND;
1319}
1320
1321static
1322void acornscsi_sendmessage(AS_Host *host)
1323{
1324 unsigned int message_length = msgqueue_msglength(&host->scsi.msgs);
1325 unsigned int msgnr;
1326 struct message *msg;
1327
1328#if (DEBUG & DEBUG_MESSAGES)
1329 printk("scsi%d.%c: sending message ",
1330 host->host->host_no, acornscsi_target(host));
1331#endif
1332
1333 switch (message_length) {
1334 case 0:
1335 acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT);
1336
1337 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "sending message 1");
1338
ffd7858d 1339 sbic_arm_write(host, SBIC_DATA, NOP);
1da177e4
LT		 1340
1341 host->scsi.last_message = NOP;
1342#if (DEBUG & DEBUG_MESSAGES)
1343 printk("NOP");
1344#endif
1345 break;
1346
1347 case 1:
1348 acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT);
1349 msg = msgqueue_getmsg(&host->scsi.msgs, 0);
1350
1351 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "sending message 2");
1352
ffd7858d 1353 sbic_arm_write(host, SBIC_DATA, msg->msg[0]);
1da177e4
LT		 1354
1355 host->scsi.last_message = msg->msg[0];
1356#if (DEBUG & DEBUG_MESSAGES)
1abfd370 1357 spi_print_msg(msg->msg);
1da177e4
LT		 1358#endif
1359 break;
1360
1361 default:
1362 /*
1363 * ANSI standard says: (SCSI-2 Rev 10c Sect 5.6.14)
1364 * 'When a target sends this (MESSAGE_REJECT) message, it
1365 * shall change to MESSAGE IN phase and send this message
1366 * prior to requesting additional message bytes from the
1367 * initiator. This provides an interlock so that the
1368 * initiator can determine which message byte is rejected.
1369 */
ffd7858d
RK		 1370 sbic_arm_write(host, SBIC_TRANSCNTH, 0);
1371 sbic_arm_writenext(host, 0);
1372 sbic_arm_writenext(host, message_length);
1da177e4
LT		 1373 acornscsi_sbic_issuecmd(host, CMND_XFERINFO);
1374
1375 msgnr = 0;
1376 while ((msg = msgqueue_getmsg(&host->scsi.msgs, msgnr++)) != NULL) {
1377 unsigned int i;
1378#if (DEBUG & DEBUG_MESSAGES)
1abfd370 1379 spi_print_msg(msg);
1da177e4
LT		 1380#endif
1381 i = 0;
1382 if (acornscsi_write_pio(host, msg->msg, &i, msg->length, 1000000))
1383 printk("scsi%d: timeout while sending message\n", host->host->host_no);
1384
1385 host->scsi.last_message = msg->msg[0];
1386 if (msg->msg[0] == EXTENDED_MESSAGE)
1387 host->scsi.last_message |= msg->msg[2] << 8;
1388
1389 if (i != msg->length)
1390 break;
1391 }
1392 break;
1393 }
1394#if (DEBUG & DEBUG_MESSAGES)
1395 printk("\n");
1396#endif
1397}
1398
1399/*
1400 * Function: void acornscsi_readstatusbyte(AS_Host *host)
1401 * Purpose : Read status byte from connected target
1402 * Params : host - host connected to target
1403 */
1404static
1405void acornscsi_readstatusbyte(AS_Host *host)
1406{
1407 acornscsi_sbic_issuecmd(host, CMND_XFERINFO|CMND_SBT);
1408 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "reading status byte");
ffd7858d 1409 host->scsi.SCp.Status = sbic_arm_read(host, SBIC_DATA);
1da177e4
LT		 1410}
1411
1412/*
1413 * Function: unsigned char acornscsi_readmessagebyte(AS_Host *host)
1414 * Purpose : Read one message byte from connected target
1415 * Params : host - host connected to target
1416 */
1417static
1418unsigned char acornscsi_readmessagebyte(AS_Host *host)
1419{
1420 unsigned char message;
1421
1422 acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT);
1423
1424 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "for message byte");
1425
ffd7858d 1426 message = sbic_arm_read(host, SBIC_DATA);
1da177e4
LT		 1427
1428 /* wait for MSGIN-XFER-PAUSED */
1429 acornscsi_sbic_wait(host, ASR_INT, ASR_INT, 1000, "for interrupt after message byte");
1430
ffd7858d 1431 sbic_arm_read(host, SBIC_SSR);
1da177e4
LT		 1432
1433 return message;
1434}
1435
1436/*
1437 * Function: void acornscsi_message(AS_Host *host)
1438 * Purpose : Read complete message from connected target & action message
1439 * Params : host - host connected to target
1440 */
1441static
1442void acornscsi_message(AS_Host *host)
1443{
1444 unsigned char message[16];
1445 unsigned int msgidx = 0, msglen = 1;
1446
1447 do {
1448 message[msgidx] = acornscsi_readmessagebyte(host);
1449
1450 switch (msgidx) {
1451 case 0:
1452 if (message[0] == EXTENDED_MESSAGE ||
1453 (message[0] >= 0x20 && message[0] <= 0x2f))
1454 msglen = 2;
1455 break;
1456
1457 case 1:
1458 if (message[0] == EXTENDED_MESSAGE)
1459 msglen += message[msgidx];
1460 break;
1461 }
1462 msgidx += 1;
1463 if (msgidx < msglen) {
1464 acornscsi_sbic_issuecmd(host, CMND_NEGATEACK);
1465
1466 /* wait for next msg-in */
1467 acornscsi_sbic_wait(host, ASR_INT, ASR_INT, 1000, "for interrupt after negate ack");
ffd7858d 1468 sbic_arm_read(host, SBIC_SSR);
1da177e4
LT		 1469 }
1470 } while (msgidx < msglen);
1471
1472#if (DEBUG & DEBUG_MESSAGES)
1473 printk("scsi%d.%c: message in: ",
1474 host->host->host_no, acornscsi_target(host));
1abfd370 1475 spi_print_msg(message);
1da177e4
LT		 1476 printk("\n");
1477#endif
1478
1479 if (host->scsi.phase == PHASE_RECONNECTED) {
1480 /*
1481 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.17)
1482 * 'Whenever a target reconnects to an initiator to continue
1483 * a tagged I/O process, the SIMPLE QUEUE TAG message shall
1484 * be sent immediately following the IDENTIFY message...'
1485 */
1486 if (message[0] == SIMPLE_QUEUE_TAG)
1487 host->scsi.reconnected.tag = message[1];
1488 if (acornscsi_reconnect_finish(host))
1489 host->scsi.phase = PHASE_MSGIN;
1490 }
1491
1492 switch (message[0]) {
1493 case ABORT:
1494 case ABORT_TAG:
1495 case COMMAND_COMPLETE:
1496 if (host->scsi.phase != PHASE_STATUSIN) {
1497 printk(KERN_ERR "scsi%d.%c: command complete following non-status in phase?\n",
1498 host->host->host_no, acornscsi_target(host));
1499 acornscsi_dumplog(host, host->SCpnt->device->id);
1500 }
1501 host->scsi.phase = PHASE_DONE;
1502 host->scsi.SCp.Message = message[0];
1503 break;
1504
1505 case SAVE_POINTERS:
1506 /*
1507 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.20)
1508 * 'The SAVE DATA POINTER message is sent from a target to
1509 * direct the initiator to copy the active data pointer to
1510 * the saved data pointer for the current I/O process.
1511 */
1512 acornscsi_dma_cleanup(host);
1513 host->SCpnt->SCp = host->scsi.SCp;
1514 host->SCpnt->SCp.sent_command = 0;
1515 host->scsi.phase = PHASE_MSGIN;
1516 break;
1517
1518 case RESTORE_POINTERS:
1519 /*
1520 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.19)
1521 * 'The RESTORE POINTERS message is sent from a target to
1522 * direct the initiator to copy the most recently saved
1523 * command, data, and status pointers for the I/O process
1524 * to the corresponding active pointers. The command and
1525 * status pointers shall be restored to the beginning of
1526 * the present command and status areas.'
1527 */
1528 acornscsi_dma_cleanup(host);
1529 host->scsi.SCp = host->SCpnt->SCp;
1530 host->scsi.phase = PHASE_MSGIN;
1531 break;
1532
1533 case DISCONNECT:
1534 /*
1535 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 6.4.2)
1536 * 'On those occasions when an error or exception condition occurs
1537 * and the target elects to repeat the information transfer, the
1538 * target may repeat the transfer either issuing a RESTORE POINTERS
1539 * message or by disconnecting without issuing a SAVE POINTERS
1540 * message. When reconnection is completed, the most recent
1541 * saved pointer values are restored.'
1542 */
1543 acornscsi_dma_cleanup(host);
1544 host->scsi.phase = PHASE_DISCONNECT;
1545 break;
1546
1547 case MESSAGE_REJECT:
1548#if 0 /* this isn't needed any more */
1549 /*
1550 * If we were negociating sync transfer, we don't yet know if
1551 * this REJECT is for the sync transfer or for the tagged queue/wide
25985edc 1552 * transfer. Re-initiate sync transfer negotiation now, and if
1da177e4
LT		 1553 * we got a REJECT in response to SDTR, then it'll be set to DONE.
1554 */
1555 if (host->device[host->SCpnt->device->id].sync_state == SYNC_SENT_REQUEST)
1556 host->device[host->SCpnt->device->id].sync_state = SYNC_NEGOCIATE;
1557#endif
1558
1559 /*
1560 * If we have any messages waiting to go out, then assert ATN now
1561 */
1562 if (msgqueue_msglength(&host->scsi.msgs))
1563 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN);
1564
1565 switch (host->scsi.last_message) {
1566#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
1567 case HEAD_OF_QUEUE_TAG:
1568 case ORDERED_QUEUE_TAG:
1569 case SIMPLE_QUEUE_TAG:
1570 /*
1571 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.17)
1572 * If a target does not implement tagged queuing and a queue tag
1573 * message is received, it shall respond with a MESSAGE REJECT
1574 * message and accept the I/O process as if it were untagged.
1575 */
1576 printk(KERN_NOTICE "scsi%d.%c: disabling tagged queueing\n",
1577 host->host->host_no, acornscsi_target(host));
1578 host->SCpnt->device->simple_tags = 0;
1579 set_bit(host->SCpnt->device->id * 8 + host->SCpnt->device->lun, host->busyluns);
1580 break;
1581#endif
1582 case EXTENDED_MESSAGE | (EXTENDED_SDTR << 8):
1583 /*
1584 * Target can't handle synchronous transfers
1585 */
1586 printk(KERN_NOTICE "scsi%d.%c: Using asynchronous transfer\n",
1587 host->host->host_no, acornscsi_target(host));
1588 host->device[host->SCpnt->device->id].sync_xfer = SYNCHTRANSFER_2DBA;
1589 host->device[host->SCpnt->device->id].sync_state = SYNC_ASYNCHRONOUS;
ffd7858d 1590 sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer);
1da177e4
LT		 1591 break;
1592
1593 default:
1594 break;
1595 }
1596 break;
1597
1598 case QUEUE_FULL:
1599 /* TODO: target queue is full */
1600 break;
1601
1602 case SIMPLE_QUEUE_TAG:
1603 /* tag queue reconnect... message[1] = queue tag. Print something to indicate something happened! */
1604 printk("scsi%d.%c: reconnect queue tag %02X\n",
1605 host->host->host_no, acornscsi_target(host),
1606 message[1]);
1607 break;
1608
1609 case EXTENDED_MESSAGE:
1610 switch (message[2]) {
1611#ifdef CONFIG_SCSI_ACORNSCSI_SYNC
1612 case EXTENDED_SDTR:
1613 if (host->device[host->SCpnt->device->id].sync_state == SYNC_SENT_REQUEST) {
1614 /*
1615 * We requested synchronous transfers. This isn't quite right...
1616 * We can only say if this succeeded if we proceed on to execute the
1617 * command from this message. If we get a MESSAGE PARITY ERROR,
1618 * and the target retries fail, then we fallback to asynchronous mode
1619 */
1620 host->device[host->SCpnt->device->id].sync_state = SYNC_COMPLETED;
1621 printk(KERN_NOTICE "scsi%d.%c: Using synchronous transfer, offset %d, %d ns\n",
1622 host->host->host_no, acornscsi_target(host),
1623 message[4], message[3] * 4);
1624 host->device[host->SCpnt->device->id].sync_xfer =
1625 calc_sync_xfer(message[3] * 4, message[4]);
1626 } else {
1627 unsigned char period, length;
1628 /*
1629 * Target requested synchronous transfers. The agreement is only
1630 * to be in operation AFTER the target leaves message out phase.
1631 */
1632 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN);
1633 period = max_t(unsigned int, message[3], sdtr_period / 4);
1634 length = min_t(unsigned int, message[4], sdtr_size);
1635 msgqueue_addmsg(&host->scsi.msgs, 5, EXTENDED_MESSAGE, 3,
1636 EXTENDED_SDTR, period, length);
1637 host->device[host->SCpnt->device->id].sync_xfer =
1638 calc_sync_xfer(period * 4, length);
1639 }
ffd7858d 1640 sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer);
1da177e4
LT		 1641 break;
1642#else
1643 /* We do not accept synchronous transfers. Respond with a
1644 * MESSAGE_REJECT.
1645 */
1646#endif
1647
1648 case EXTENDED_WDTR:
1649 /* The WD33C93A is only 8-bit. We respond with a MESSAGE_REJECT
1650 * to a wide data transfer request.
1651 */
1652 default:
1653 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN);
1654 msgqueue_flush(&host->scsi.msgs);
1655 msgqueue_addmsg(&host->scsi.msgs, 1, MESSAGE_REJECT);
1656 break;
1657 }
1658 break;
1659
1da177e4
LT		 1660 default: /* reject message */
1661 printk(KERN_ERR "scsi%d.%c: unrecognised message %02X, rejecting\n",
1662 host->host->host_no, acornscsi_target(host),
1663 message[0]);
1664 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN);
1665 msgqueue_flush(&host->scsi.msgs);
1666 msgqueue_addmsg(&host->scsi.msgs, 1, MESSAGE_REJECT);
1667 host->scsi.phase = PHASE_MSGIN;
1668 break;
1669 }
1670 acornscsi_sbic_issuecmd(host, CMND_NEGATEACK);
1671}
1672
1673/*
1674 * Function: int acornscsi_buildmessages(AS_Host *host)
1675 * Purpose : build the connection messages for a host
1676 * Params : host - host to add messages to
1677 */
1678static
1679void acornscsi_buildmessages(AS_Host *host)
1680{
1681#if 0
1682 /* does the device need resetting? */
1683 if (cmd_reset) {
1684 msgqueue_addmsg(&host->scsi.msgs, 1, BUS_DEVICE_RESET);
1685 return;
1686 }
1687#endif
1688
1689 msgqueue_addmsg(&host->scsi.msgs, 1,
1690 IDENTIFY(host->device[host->SCpnt->device->id].disconnect_ok,
1691 host->SCpnt->device->lun));
1692
1693#if 0
1694 /* does the device need the current command aborted */
1695 if (cmd_aborted) {
1696 acornscsi_abortcmd(host->SCpnt->tag);
1697 return;
1698 }
1699#endif
1700
1701#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
1702 if (host->SCpnt->tag) {
1703 unsigned int tag_type;
1704
1705 if (host->SCpnt->cmnd[0] == REQUEST_SENSE ||
1706 host->SCpnt->cmnd[0] == TEST_UNIT_READY ||
1707 host->SCpnt->cmnd[0] == INQUIRY)
1708 tag_type = HEAD_OF_QUEUE_TAG;
1709 else
1710 tag_type = SIMPLE_QUEUE_TAG;
1711 msgqueue_addmsg(&host->scsi.msgs, 2, tag_type, host->SCpnt->tag);
1712 }
1713#endif
1714
1715#ifdef CONFIG_SCSI_ACORNSCSI_SYNC
1716 if (host->device[host->SCpnt->device->id].sync_state == SYNC_NEGOCIATE) {
1717 host->device[host->SCpnt->device->id].sync_state = SYNC_SENT_REQUEST;
1718 msgqueue_addmsg(&host->scsi.msgs, 5,
1719 EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
1720 sdtr_period / 4, sdtr_size);
1721 }
1722#endif
1723}
1724
1725/*
1726 * Function: int acornscsi_starttransfer(AS_Host *host)
1727 * Purpose : transfer data to/from connected target
1728 * Params : host - host to which target is connected
1729 * Returns : 0 if failure
1730 */
1731static
1732int acornscsi_starttransfer(AS_Host *host)
1733{
1734 int residual;
1735
1736 if (!host->scsi.SCp.ptr /*&& host->scsi.SCp.this_residual*/) {
1737 printk(KERN_ERR "scsi%d.%c: null buffer passed to acornscsi_starttransfer\n",
1738 host->host->host_no, acornscsi_target(host));
1739 return 0;
1740 }
1741
84ac86ca 1742 residual = scsi_bufflen(host->SCpnt) - host->scsi.SCp.scsi_xferred;
1da177e4 1743
ffd7858d
RK		 1744 sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer);
1745 sbic_arm_writenext(host, residual >> 16);
1746 sbic_arm_writenext(host, residual >> 8);
1747 sbic_arm_writenext(host, residual);
1da177e4
LT		 1748 acornscsi_sbic_issuecmd(host, CMND_XFERINFO);
1749 return 1;
1750}
1751
1752/* =========================================================================================
1753 * Connection & Disconnection
1754 */
1755/*
1756 * Function : acornscsi_reconnect(AS_Host *host)
1757 * Purpose : reconnect a previously disconnected command
1758 * Params : host - host specific data
1759 * Remarks : SCSI spec says:
1760 * 'The set of active pointers is restored from the set
1761 * of saved pointers upon reconnection of the I/O process'
1762 */
1763static
1764int acornscsi_reconnect(AS_Host *host)
1765{
1766 unsigned int target, lun, ok = 0;
1767
ffd7858d 1768 target = sbic_arm_read(host, SBIC_SOURCEID);
1da177e4
LT		 1769
1770 if (!(target & 8))
1771 printk(KERN_ERR "scsi%d: invalid source id after reselection "
1772 "- device fault?\n",
1773 host->host->host_no);
1774
1775 target &= 7;
1776
1777 if (host->SCpnt && !host->scsi.disconnectable) {
1778 printk(KERN_ERR "scsi%d.%d: reconnected while command in "
1779 "progress to target %d?\n",
1780 host->host->host_no, target, host->SCpnt->device->id);
1781 host->SCpnt = NULL;
1782 }
1783
ffd7858d 1784 lun = sbic_arm_read(host, SBIC_DATA) & 7;
1da177e4
LT		 1785
1786 host->scsi.reconnected.target = target;
1787 host->scsi.reconnected.lun = lun;
1788 host->scsi.reconnected.tag = 0;
1789
1790 if (host->scsi.disconnectable && host->SCpnt &&
1791 host->SCpnt->device->id == target && host->SCpnt->device->lun == lun)
1792 ok = 1;
1793
1794 if (!ok && queue_probetgtlun(&host->queues.disconnected, target, lun))
1795 ok = 1;
1796
1797 ADD_STATUS(target, 0x81, host->scsi.phase, 0);
1798
1799 if (ok) {
1800 host->scsi.phase = PHASE_RECONNECTED;
1801 } else {
1802 /* this doesn't seem to work */
1803 printk(KERN_ERR "scsi%d.%c: reselected with no command "
1804 "to reconnect with\n",
1805 host->host->host_no, '0' + target);
1806 acornscsi_dumplog(host, target);
1807 acornscsi_abortcmd(host, 0);
1808 if (host->SCpnt) {
1809 queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt);
1810 host->SCpnt = NULL;
1811 }
1812 }
1813 acornscsi_sbic_issuecmd(host, CMND_NEGATEACK);
1814 return !ok;
1815}
1816
1817/*
1818 * Function: int acornscsi_reconect_finish(AS_Host *host)
1819 * Purpose : finish reconnecting a command
1820 * Params : host - host to complete
1821 * Returns : 0 if failed
1822 */
1823static
1824int acornscsi_reconnect_finish(AS_Host *host)
1825{
1826 if (host->scsi.disconnectable && host->SCpnt) {
1827 host->scsi.disconnectable = 0;
1828 if (host->SCpnt->device->id == host->scsi.reconnected.target &&
1829 host->SCpnt->device->lun == host->scsi.reconnected.lun &&
1830 host->SCpnt->tag == host->scsi.reconnected.tag) {
1831#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
1832 DBG(host->SCpnt, printk("scsi%d.%c: reconnected",
1833 host->host->host_no, acornscsi_target(host)));
1834#endif
1835 } else {
1836 queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt);
1837#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
1838 DBG(host->SCpnt, printk("scsi%d.%c: had to move command "
1839 "to disconnected queue\n",
1840 host->host->host_no, acornscsi_target(host)));
1841#endif
1842 host->SCpnt = NULL;
1843 }
1844 }
1845 if (!host->SCpnt) {
1846 host->SCpnt = queue_remove_tgtluntag(&host->queues.disconnected,
1847 host->scsi.reconnected.target,
1848 host->scsi.reconnected.lun,
1849 host->scsi.reconnected.tag);
1850#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
1851 DBG(host->SCpnt, printk("scsi%d.%c: had to get command",
1852 host->host->host_no, acornscsi_target(host)));
1853#endif
1854 }
1855
1856 if (!host->SCpnt)
1857 acornscsi_abortcmd(host, host->scsi.reconnected.tag);
1858 else {
1859 /*
1860 * Restore data pointer from SAVED pointers.
1861 */
1862 host->scsi.SCp = host->SCpnt->SCp;
1863#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
1864 printk(", data pointers: [%p, %X]",
1865 host->scsi.SCp.ptr, host->scsi.SCp.this_residual);
1866#endif
1867 }
1868#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
1869 printk("\n");
1870#endif
1871
1872 host->dma.transferred = host->scsi.SCp.scsi_xferred;
1873
1874 return host->SCpnt != NULL;
1875}
1876
1877/*
1878 * Function: void acornscsi_disconnect_unexpected(AS_Host *host)
1879 * Purpose : handle an unexpected disconnect
1880 * Params : host - host on which disconnect occurred
1881 */
1882static
1883void acornscsi_disconnect_unexpected(AS_Host *host)
1884{
1885 printk(KERN_ERR "scsi%d.%c: unexpected disconnect\n",
1886 host->host->host_no, acornscsi_target(host));
1887#if (DEBUG & DEBUG_ABORT)
1888 acornscsi_dumplog(host, 8);
1889#endif
1890
1891 acornscsi_done(host, &host->SCpnt, DID_ERROR);
1892}
1893
1894/*
1895 * Function: void acornscsi_abortcmd(AS_host *host, unsigned char tag)
1896 * Purpose : abort a currently executing command
1897 * Params : host - host with connected command to abort
1898 * tag - tag to abort
1899 */
1900static
1901void acornscsi_abortcmd(AS_Host *host, unsigned char tag)
1902{
1903 host->scsi.phase = PHASE_ABORTED;
ffd7858d 1904 sbic_arm_write(host, SBIC_CMND, CMND_ASSERTATN);
1da177e4
LT		 1905
1906 msgqueue_flush(&host->scsi.msgs);
1907#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
1908 if (tag)
1909 msgqueue_addmsg(&host->scsi.msgs, 2, ABORT_TAG, tag);
1910 else
1911#endif
1912 msgqueue_addmsg(&host->scsi.msgs, 1, ABORT);
1913}
1914
1915/* ==========================================================================================
1916 * Interrupt routines.
1917 */
1918/*
1919 * Function: int acornscsi_sbicintr(AS_Host *host)
1920 * Purpose : handle interrupts from SCSI device
1921 * Params : host - host to process
1922 * Returns : INTR_PROCESS if expecting another SBIC interrupt
1923 * INTR_IDLE if no interrupt
1924 * INTR_NEXT_COMMAND if we have finished processing the command
1925 */
1926static
1927intr_ret_t acornscsi_sbicintr(AS_Host *host, int in_irq)
1928{
1929 unsigned int asr, ssr;
1930
ffd7858d 1931 asr = sbic_arm_read(host, SBIC_ASR);
1da177e4
LT		 1932 if (!(asr & ASR_INT))
1933 return INTR_IDLE;
1934
ffd7858d 1935 ssr = sbic_arm_read(host, SBIC_SSR);
1da177e4
LT		 1936
1937#if (DEBUG & DEBUG_PHASES)
1938 print_sbic_status(asr, ssr, host->scsi.phase);
1939#endif
1940
1941 ADD_STATUS(8, ssr, host->scsi.phase, in_irq);
1942
1943 if (host->SCpnt && !host->scsi.disconnectable)
1944 ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, in_irq);
1945
1946 switch (ssr) {
1947 case 0x00: /* reset state - not advanced */
1948 printk(KERN_ERR "scsi%d: reset in standard mode but wanted advanced mode.\n",
1949 host->host->host_no);
1950 /* setup sbic - WD33C93A */
ffd7858d
RK		 1951 sbic_arm_write(host, SBIC_OWNID, OWNID_EAF | host->host->this_id);
1952 sbic_arm_write(host, SBIC_CMND, CMND_RESET);
1da177e4
LT		 1953 return INTR_IDLE;
1954
1955 case 0x01: /* reset state - advanced */
ffd7858d
RK		 1956 sbic_arm_write(host, SBIC_CTRL, INIT_SBICDMA | CTRL_IDI);
1957 sbic_arm_write(host, SBIC_TIMEOUT, TIMEOUT_TIME);
1958 sbic_arm_write(host, SBIC_SYNCHTRANSFER, SYNCHTRANSFER_2DBA);
1959 sbic_arm_write(host, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP);
1da177e4
LT		 1960 msgqueue_flush(&host->scsi.msgs);
1961 return INTR_IDLE;
1962
1963 case 0x41: /* unexpected disconnect aborted command */
1964 acornscsi_disconnect_unexpected(host);
1965 return INTR_NEXT_COMMAND;
1966 }
1967
1968 switch (host->scsi.phase) {
1969 case PHASE_CONNECTING: /* STATE: command removed from issue queue */
1970 switch (ssr) {
1971 case 0x11: /* -> PHASE_CONNECTED */
1972 /* BUS FREE -> SELECTION */
1973 host->scsi.phase = PHASE_CONNECTED;
1974 msgqueue_flush(&host->scsi.msgs);
1975 host->dma.transferred = host->scsi.SCp.scsi_xferred;
1976 /* 33C93 gives next interrupt indicating bus phase */
ffd7858d 1977 asr = sbic_arm_read(host, SBIC_ASR);
1da177e4
LT		 1978 if (!(asr & ASR_INT))
1979 break;
ffd7858d 1980 ssr = sbic_arm_read(host, SBIC_SSR);
1da177e4
LT		 1981 ADD_STATUS(8, ssr, host->scsi.phase, 1);
1982 ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, 1);
1983 goto connected;
1984
1985 case 0x42: /* select timed out */
1986 /* -> PHASE_IDLE */
1987 acornscsi_done(host, &host->SCpnt, DID_NO_CONNECT);
1988 return INTR_NEXT_COMMAND;
1989
1990 case 0x81: /* -> PHASE_RECONNECTED or PHASE_ABORTED */
1991 /* BUS FREE -> RESELECTION */
1992 host->origSCpnt = host->SCpnt;
1993 host->SCpnt = NULL;
1994 msgqueue_flush(&host->scsi.msgs);
1995 acornscsi_reconnect(host);
1996 break;
1997
1998 default:
1999 printk(KERN_ERR "scsi%d.%c: PHASE_CONNECTING, SSR %02X?\n",
2000 host->host->host_no, acornscsi_target(host), ssr);
2001 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2002 acornscsi_abortcmd(host, host->SCpnt->tag);
2003 }
2004 return INTR_PROCESSING;
2005
2006 connected:
2007 case PHASE_CONNECTED: /* STATE: device selected ok */
2008 switch (ssr) {
2009#ifdef NONSTANDARD
2010 case 0x8a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */
2011 /* SELECTION -> COMMAND */
2012 acornscsi_sendcommand(host);
2013 break;
2014
2015 case 0x8b: /* -> PHASE_STATUS */
2016 /* SELECTION -> STATUS */
2017 acornscsi_readstatusbyte(host);
2018 host->scsi.phase = PHASE_STATUSIN;
2019 break;
2020#endif
2021
2022 case 0x8e: /* -> PHASE_MSGOUT */
2023 /* SELECTION ->MESSAGE OUT */
2024 host->scsi.phase = PHASE_MSGOUT;
2025 acornscsi_buildmessages(host);
2026 acornscsi_sendmessage(host);
2027 break;
2028
2029 /* these should not happen */
2030 case 0x85: /* target disconnected */
2031 acornscsi_done(host, &host->SCpnt, DID_ERROR);
2032 break;
2033
2034 default:
2035 printk(KERN_ERR "scsi%d.%c: PHASE_CONNECTED, SSR %02X?\n",
2036 host->host->host_no, acornscsi_target(host), ssr);
2037 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2038 acornscsi_abortcmd(host, host->SCpnt->tag);
2039 }
2040 return INTR_PROCESSING;
2041
2042 case PHASE_MSGOUT: /* STATE: connected & sent IDENTIFY message */
2043 /*
2044 * SCSI standard says that MESSAGE OUT phases can be followed by a
2045 * DATA phase, STATUS phase, MESSAGE IN phase or COMMAND phase
2046 */
2047 switch (ssr) {
2048 case 0x8a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */
2049 case 0x1a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */
2050 /* MESSAGE OUT -> COMMAND */
2051 acornscsi_sendcommand(host);
2052 break;
2053
2054 case 0x8b: /* -> PHASE_STATUS */
2055 case 0x1b: /* -> PHASE_STATUS */
2056 /* MESSAGE OUT -> STATUS */
2057 acornscsi_readstatusbyte(host);
2058 host->scsi.phase = PHASE_STATUSIN;
2059 break;
2060
2061 case 0x8e: /* -> PHASE_MSGOUT */
2062 /* MESSAGE_OUT(MESSAGE_IN) ->MESSAGE OUT */
2063 acornscsi_sendmessage(host);
2064 break;
2065
2066 case 0x4f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */
2067 case 0x1f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */
2068 /* MESSAGE OUT -> MESSAGE IN */
2069 acornscsi_message(host);
2070 break;
2071
2072 default:
2073 printk(KERN_ERR "scsi%d.%c: PHASE_MSGOUT, SSR %02X?\n",
2074 host->host->host_no, acornscsi_target(host), ssr);
2075 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2076 }
2077 return INTR_PROCESSING;
2078
2079 case PHASE_COMMAND: /* STATE: connected & command sent */
2080 switch (ssr) {
2081 case 0x18: /* -> PHASE_DATAOUT */
2082 /* COMMAND -> DATA OUT */
2083 if (host->scsi.SCp.sent_command != host->SCpnt->cmd_len)
2084 acornscsi_abortcmd(host, host->SCpnt->tag);
2085 acornscsi_dma_setup(host, DMA_OUT);
2086 if (!acornscsi_starttransfer(host))
2087 acornscsi_abortcmd(host, host->SCpnt->tag);
2088 host->scsi.phase = PHASE_DATAOUT;
2089 return INTR_IDLE;
2090
2091 case 0x19: /* -> PHASE_DATAIN */
2092 /* COMMAND -> DATA IN */
2093 if (host->scsi.SCp.sent_command != host->SCpnt->cmd_len)
2094 acornscsi_abortcmd(host, host->SCpnt->tag);
2095 acornscsi_dma_setup(host, DMA_IN);
2096 if (!acornscsi_starttransfer(host))
2097 acornscsi_abortcmd(host, host->SCpnt->tag);
2098 host->scsi.phase = PHASE_DATAIN;
2099 return INTR_IDLE;
2100
2101 case 0x1b: /* -> PHASE_STATUS */
2102 /* COMMAND -> STATUS */
2103 acornscsi_readstatusbyte(host);
2104 host->scsi.phase = PHASE_STATUSIN;
2105 break;
2106
2107 case 0x1e: /* -> PHASE_MSGOUT */
2108 /* COMMAND -> MESSAGE OUT */
2109 acornscsi_sendmessage(host);
2110 break;
2111
2112 case 0x1f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */
2113 /* COMMAND -> MESSAGE IN */
2114 acornscsi_message(host);
2115 break;
2116
2117 default:
2118 printk(KERN_ERR "scsi%d.%c: PHASE_COMMAND, SSR %02X?\n",
2119 host->host->host_no, acornscsi_target(host), ssr);
2120 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2121 }
2122 return INTR_PROCESSING;
2123
2124 case PHASE_DISCONNECT: /* STATE: connected, received DISCONNECT msg */
2125 if (ssr == 0x85) { /* -> PHASE_IDLE */
2126 host->scsi.disconnectable = 1;
2127 host->scsi.reconnected.tag = 0;
2128 host->scsi.phase = PHASE_IDLE;
2129 host->stats.disconnects += 1;
2130 } else {
2131 printk(KERN_ERR "scsi%d.%c: PHASE_DISCONNECT, SSR %02X instead of disconnect?\n",
2132 host->host->host_no, acornscsi_target(host), ssr);
2133 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2134 }
2135 return INTR_NEXT_COMMAND;
2136
2137 case PHASE_IDLE: /* STATE: disconnected */
2138 if (ssr == 0x81) /* -> PHASE_RECONNECTED or PHASE_ABORTED */
2139 acornscsi_reconnect(host);
2140 else {
2141 printk(KERN_ERR "scsi%d.%c: PHASE_IDLE, SSR %02X while idle?\n",
2142 host->host->host_no, acornscsi_target(host), ssr);
2143 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2144 }
2145 return INTR_PROCESSING;
2146
2147 case PHASE_RECONNECTED: /* STATE: device reconnected to initiator */
2148 /*
2149 * Command reconnected - if MESGIN, get message - it may be
2150 * the tag. If not, get command out of disconnected queue
2151 */
2152 /*
2153 * If we reconnected and we're not in MESSAGE IN phase after IDENTIFY,
2154 * reconnect I_T_L command
2155 */
2156 if (ssr != 0x8f && !acornscsi_reconnect_finish(host))
2157 return INTR_IDLE;
2158 ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, in_irq);
2159 switch (ssr) {
2160 case 0x88: /* data out phase */
2161 /* -> PHASE_DATAOUT */
2162 /* MESSAGE IN -> DATA OUT */
2163 acornscsi_dma_setup(host, DMA_OUT);
2164 if (!acornscsi_starttransfer(host))
2165 acornscsi_abortcmd(host, host->SCpnt->tag);
2166 host->scsi.phase = PHASE_DATAOUT;
2167 return INTR_IDLE;
2168
2169 case 0x89: /* data in phase */
2170 /* -> PHASE_DATAIN */
2171 /* MESSAGE IN -> DATA IN */
2172 acornscsi_dma_setup(host, DMA_IN);
2173 if (!acornscsi_starttransfer(host))
2174 acornscsi_abortcmd(host, host->SCpnt->tag);
2175 host->scsi.phase = PHASE_DATAIN;
2176 return INTR_IDLE;
2177
2178 case 0x8a: /* command out */
2179 /* MESSAGE IN -> COMMAND */
2180 acornscsi_sendcommand(host);/* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */
2181 break;
2182
2183 case 0x8b: /* status in */
2184 /* -> PHASE_STATUSIN */
2185 /* MESSAGE IN -> STATUS */
2186 acornscsi_readstatusbyte(host);
2187 host->scsi.phase = PHASE_STATUSIN;
2188 break;
2189
2190 case 0x8e: /* message out */
2191 /* -> PHASE_MSGOUT */
2192 /* MESSAGE IN -> MESSAGE OUT */
2193 acornscsi_sendmessage(host);
2194 break;
2195
2196 case 0x8f: /* message in */
2197 acornscsi_message(host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */
2198 break;
2199
2200 default:
2201 printk(KERN_ERR "scsi%d.%c: PHASE_RECONNECTED, SSR %02X after reconnect?\n",
2202 host->host->host_no, acornscsi_target(host), ssr);
2203 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2204 }
2205 return INTR_PROCESSING;
2206
2207 case PHASE_DATAIN: /* STATE: transferred data in */
2208 /*
2209 * This is simple - if we disconnect then the DMA address & count is
2210 * correct.
2211 */
2212 switch (ssr) {
2213 case 0x19: /* -> PHASE_DATAIN */
2214 case 0x89: /* -> PHASE_DATAIN */
2215 acornscsi_abortcmd(host, host->SCpnt->tag);
2216 return INTR_IDLE;
2217
2218 case 0x1b: /* -> PHASE_STATUSIN */
2219 case 0x4b: /* -> PHASE_STATUSIN */
2220 case 0x8b: /* -> PHASE_STATUSIN */
2221 /* DATA IN -> STATUS */
84ac86ca 2222 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
1da177e4
LT		 2223 acornscsi_sbic_xfcount(host);
2224 acornscsi_dma_stop(host);
2225 acornscsi_readstatusbyte(host);
2226 host->scsi.phase = PHASE_STATUSIN;
2227 break;
2228
2229 case 0x1e: /* -> PHASE_MSGOUT */
2230 case 0x4e: /* -> PHASE_MSGOUT */
2231 case 0x8e: /* -> PHASE_MSGOUT */
2232 /* DATA IN -> MESSAGE OUT */
84ac86ca 2233 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
1da177e4
LT		 2234 acornscsi_sbic_xfcount(host);
2235 acornscsi_dma_stop(host);
2236 acornscsi_sendmessage(host);
2237 break;
2238
2239 case 0x1f: /* message in */
2240 case 0x4f: /* message in */
2241 case 0x8f: /* message in */
2242 /* DATA IN -> MESSAGE IN */
84ac86ca 2243 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
1da177e4
LT		 2244 acornscsi_sbic_xfcount(host);
2245 acornscsi_dma_stop(host);
2246 acornscsi_message(host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */
2247 break;
2248
2249 default:
2250 printk(KERN_ERR "scsi%d.%c: PHASE_DATAIN, SSR %02X?\n",
2251 host->host->host_no, acornscsi_target(host), ssr);
2252 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2253 }
2254 return INTR_PROCESSING;
2255
2256 case PHASE_DATAOUT: /* STATE: transferred data out */
2257 /*
2258 * This is more complicated - if we disconnect, the DMA could be 12
2259 * bytes ahead of us. We need to correct this.
2260 */
2261 switch (ssr) {
2262 case 0x18: /* -> PHASE_DATAOUT */
2263 case 0x88: /* -> PHASE_DATAOUT */
2264 acornscsi_abortcmd(host, host->SCpnt->tag);
2265 return INTR_IDLE;
2266
2267 case 0x1b: /* -> PHASE_STATUSIN */
2268 case 0x4b: /* -> PHASE_STATUSIN */
2269 case 0x8b: /* -> PHASE_STATUSIN */
2270 /* DATA OUT -> STATUS */
84ac86ca 2271 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
1da177e4
LT		 2272 acornscsi_sbic_xfcount(host);
2273 acornscsi_dma_stop(host);
2274 acornscsi_dma_adjust(host);
2275 acornscsi_readstatusbyte(host);
2276 host->scsi.phase = PHASE_STATUSIN;
2277 break;
2278
2279 case 0x1e: /* -> PHASE_MSGOUT */
2280 case 0x4e: /* -> PHASE_MSGOUT */
2281 case 0x8e: /* -> PHASE_MSGOUT */
2282 /* DATA OUT -> MESSAGE OUT */
84ac86ca 2283 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
1da177e4
LT		 2284 acornscsi_sbic_xfcount(host);
2285 acornscsi_dma_stop(host);
2286 acornscsi_dma_adjust(host);
2287 acornscsi_sendmessage(host);
2288 break;
2289
2290 case 0x1f: /* message in */
2291 case 0x4f: /* message in */
2292 case 0x8f: /* message in */
2293 /* DATA OUT -> MESSAGE IN */
84ac86ca 2294 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
1da177e4
LT		 2295 acornscsi_sbic_xfcount(host);
2296 acornscsi_dma_stop(host);
2297 acornscsi_dma_adjust(host);
2298 acornscsi_message(host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */
2299 break;
2300
2301 default:
2302 printk(KERN_ERR "scsi%d.%c: PHASE_DATAOUT, 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_STATUSIN: /* STATE: status in complete */
2309 switch (ssr) {
2310 case 0x1f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */
2311 case 0x8f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */
2312 /* STATUS -> MESSAGE IN */
2313 acornscsi_message(host);
2314 break;
2315
2316 case 0x1e: /* -> PHASE_MSGOUT */
2317 case 0x8e: /* -> PHASE_MSGOUT */
2318 /* STATUS -> MESSAGE OUT */
2319 acornscsi_sendmessage(host);
2320 break;
2321
2322 default:
2323 printk(KERN_ERR "scsi%d.%c: PHASE_STATUSIN, SSR %02X instead of MESSAGE_IN?\n",
2324 host->host->host_no, acornscsi_target(host), ssr);
2325 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2326 }
2327 return INTR_PROCESSING;
2328
2329 case PHASE_MSGIN: /* STATE: message in */
2330 switch (ssr) {
2331 case 0x1e: /* -> PHASE_MSGOUT */
2332 case 0x4e: /* -> PHASE_MSGOUT */
2333 case 0x8e: /* -> PHASE_MSGOUT */
2334 /* MESSAGE IN -> MESSAGE OUT */
2335 acornscsi_sendmessage(host);
2336 break;
2337
2338 case 0x1f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */
2339 case 0x2f:
2340 case 0x4f:
2341 case 0x8f:
2342 acornscsi_message(host);
2343 break;
2344
2345 case 0x85:
2346 printk("scsi%d.%c: strange message in disconnection\n",
2347 host->host->host_no, acornscsi_target(host));
2348 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2349 acornscsi_done(host, &host->SCpnt, DID_ERROR);
2350 break;
2351
2352 default:
2353 printk(KERN_ERR "scsi%d.%c: PHASE_MSGIN, SSR %02X after message in?\n",
2354 host->host->host_no, acornscsi_target(host), ssr);
2355 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2356 }
2357 return INTR_PROCESSING;
2358
2359 case PHASE_DONE: /* STATE: received status & message */
2360 switch (ssr) {
2361 case 0x85: /* -> PHASE_IDLE */
2362 acornscsi_done(host, &host->SCpnt, DID_OK);
2363 return INTR_NEXT_COMMAND;
2364
2365 case 0x1e:
2366 case 0x8e:
2367 acornscsi_sendmessage(host);
2368 break;
2369
2370 default:
2371 printk(KERN_ERR "scsi%d.%c: PHASE_DONE, SSR %02X instead of disconnect?\n",
2372 host->host->host_no, acornscsi_target(host), ssr);
2373 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2374 }
2375 return INTR_PROCESSING;
2376
2377 case PHASE_ABORTED:
2378 switch (ssr) {
2379 case 0x85:
2380 if (host->SCpnt)
2381 acornscsi_done(host, &host->SCpnt, DID_ABORT);
2382 else {
2383 clear_bit(host->scsi.reconnected.target * 8 + host->scsi.reconnected.lun,
2384 host->busyluns);
2385 host->scsi.phase = PHASE_IDLE;
2386 }
2387 return INTR_NEXT_COMMAND;
2388
2389 case 0x1e:
2390 case 0x2e:
2391 case 0x4e:
2392 case 0x8e:
2393 acornscsi_sendmessage(host);
2394 break;
2395
2396 default:
2397 printk(KERN_ERR "scsi%d.%c: PHASE_ABORTED, SSR %02X?\n",
2398 host->host->host_no, acornscsi_target(host), ssr);
2399 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2400 }
2401 return INTR_PROCESSING;
2402
2403 default:
2404 printk(KERN_ERR "scsi%d.%c: unknown driver phase %d\n",
2405 host->host->host_no, acornscsi_target(host), ssr);
2406 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
2407 }
2408 return INTR_PROCESSING;
2409}
2410
2411/*
7d12e780 2412 * Prototype: void acornscsi_intr(int irq, void *dev_id)
1da177e4
LT		 2413 * Purpose : handle interrupts from Acorn SCSI card
2414 * Params : irq - interrupt number
2415 * dev_id - device specific data (AS_Host structure)
1da177e4
LT		 2416 */
2417static irqreturn_t
7d12e780 2418acornscsi_intr(int irq, void *dev_id)
1da177e4
LT		 2419{
2420 AS_Host *host = (AS_Host *)dev_id;
2421 intr_ret_t ret;
2422 int iostatus;
2423 int in_irq = 0;
2424
2425 do {
2426 ret = INTR_IDLE;
2427
e95a1b65 2428 iostatus = readb(host->fast + INT_REG);
1da177e4
LT		 2429
2430 if (iostatus & 2) {
2431 acornscsi_dma_intr(host);
e95a1b65 2432 iostatus = readb(host->fast + INT_REG);
1da177e4
LT		 2433 }
2434
2435 if (iostatus & 8)
2436 ret = acornscsi_sbicintr(host, in_irq);
2437
2438 /*
2439 * If we have a transfer pending, start it.
2440 * Only start it if the interface has already started transferring
2441 * it's data
2442 */
2443 if (host->dma.xfer_required)
2444 acornscsi_dma_xfer(host);
2445
2446 if (ret == INTR_NEXT_COMMAND)
2447 ret = acornscsi_kick(host);
2448
2449 in_irq = 1;
2450 } while (ret != INTR_IDLE);
2451
2452 return IRQ_HANDLED;
2453}
2454
2455/*=============================================================================================
2456 * Interfaces between interrupt handler and rest of scsi code
2457 */
2458
2459/*
ee0ca6ba 2460 * Function : acornscsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
1da177e4
LT		 2461 * Purpose : queues a SCSI command
2462 * Params : cmd - SCSI command
2463 * done - function called on completion, with pointer to command descriptor
2464 * Returns : 0, or < 0 on error.
2465 */
f281233d 2466static int acornscsi_queuecmd_lck(struct scsi_cmnd *SCpnt,
ee0ca6ba 2467 void (*done)(struct scsi_cmnd *))
1da177e4
LT		 2468{
2469 AS_Host *host = (AS_Host *)SCpnt->device->host->hostdata;
2470
2471 if (!done) {
2472 /* there should be some way of rejecting errors like this without panicing... */
2473 panic("scsi%d: queuecommand called with NULL done function [cmd=%p]",
2474 host->host->host_no, SCpnt);
2475 return -EINVAL;
2476 }
2477
2478#if (DEBUG & DEBUG_NO_WRITE)
2479 if (acornscsi_cmdtype(SCpnt->cmnd[0]) == CMD_WRITE && (NO_WRITE & (1 << SCpnt->device->id))) {
2480 printk(KERN_CRIT "scsi%d.%c: WRITE attempted with NO_WRITE flag set\n",
2481 host->host->host_no, '0' + SCpnt->device->id);
2482 SCpnt->result = DID_NO_CONNECT << 16;
2483 done(SCpnt);
2484 return 0;
2485 }
2486#endif
2487
2488 SCpnt->scsi_done = done;
2489 SCpnt->host_scribble = NULL;
2490 SCpnt->result = 0;
2491 SCpnt->tag = 0;
2492 SCpnt->SCp.phase = (int)acornscsi_datadirection(SCpnt->cmnd[0]);
2493 SCpnt->SCp.sent_command = 0;
2494 SCpnt->SCp.scsi_xferred = 0;
2495
2496 init_SCp(SCpnt);
2497
2498 host->stats.queues += 1;
2499
2500 {
2501 unsigned long flags;
2502
2503 if (!queue_add_cmd_ordered(&host->queues.issue, SCpnt)) {
2504 SCpnt->result = DID_ERROR << 16;
2505 done(SCpnt);
2506 return 0;
2507 }
2508 local_irq_save(flags);
2509 if (host->scsi.phase == PHASE_IDLE)
2510 acornscsi_kick(host);
2511 local_irq_restore(flags);
2512 }
2513 return 0;
2514}
2515
f281233d
JG		 2516DEF_SCSI_QCMD(acornscsi_queuecmd)
2517
1da177e4 2518/*
ee0ca6ba 2519 * Prototype: void acornscsi_reportstatus(struct scsi_cmnd **SCpntp1, struct scsi_cmnd **SCpntp2, int result)
1da177e4
LT		 2520 * Purpose : pass a result to *SCpntp1, and check if *SCpntp1 = *SCpntp2
2521 * Params : SCpntp1 - pointer to command to return
2522 * SCpntp2 - pointer to command to check
2523 * result - result to pass back to mid-level done function
2524 * Returns : *SCpntp2 = NULL if *SCpntp1 is the same command structure as *SCpntp2.
2525 */
ee0ca6ba
H		 2526static inline void acornscsi_reportstatus(struct scsi_cmnd **SCpntp1,
2527 struct scsi_cmnd **SCpntp2,
2528 int result)
1da177e4 2529{
ee0ca6ba 2530 struct scsi_cmnd *SCpnt = *SCpntp1;
1da177e4
LT		 2531
2532 if (SCpnt) {
2533 *SCpntp1 = NULL;
2534
2535 SCpnt->result = result;
2536 SCpnt->scsi_done(SCpnt);
2537 }
2538
2539 if (SCpnt == *SCpntp2)
2540 *SCpntp2 = NULL;
2541}
2542
2543enum res_abort { res_not_running, res_success, res_success_clear, res_snooze };
2544
2545/*
ee0ca6ba 2546 * Prototype: enum res acornscsi_do_abort(struct scsi_cmnd *SCpnt)
1da177e4
LT		 2547 * Purpose : abort a command on this host
2548 * Params : SCpnt - command to abort
2549 * Returns : our abort status
2550 */
ee0ca6ba 2551static enum res_abort acornscsi_do_abort(AS_Host *host, struct scsi_cmnd *SCpnt)
1da177e4
LT		 2552{
2553 enum res_abort res = res_not_running;
2554
2555 if (queue_remove_cmd(&host->queues.issue, SCpnt)) {
2556 /*
2557 * The command was on the issue queue, and has not been
2558 * issued yet. We can remove the command from the queue,
2559 * and acknowledge the abort. Neither the devices nor the
2560 * interface know about the command.
2561 */
2562//#if (DEBUG & DEBUG_ABORT)
2563 printk("on issue queue ");
2564//#endif
2565 res = res_success;
2566 } else if (queue_remove_cmd(&host->queues.disconnected, SCpnt)) {
2567 /*
2568 * The command was on the disconnected queue. Simply
2569 * acknowledge the abort condition, and when the target
2570 * reconnects, we will give it an ABORT message. The
2571 * target should then disconnect, and we will clear
2572 * the busylun bit.
2573 */
2574//#if (DEBUG & DEBUG_ABORT)
2575 printk("on disconnected queue ");
2576//#endif
2577 res = res_success;
2578 } else if (host->SCpnt == SCpnt) {
2579 unsigned long flags;
2580
2581//#if (DEBUG & DEBUG_ABORT)
2582 printk("executing ");
2583//#endif
2584
2585 local_irq_save(flags);
2586 switch (host->scsi.phase) {
2587 /*
2588 * If the interface is idle, and the command is 'disconnectable',
2589 * then it is the same as on the disconnected queue. We simply
2590 * remove all traces of the command. When the target reconnects,
2591 * we will give it an ABORT message since the command could not
2592 * be found. When the target finally disconnects, we will clear
2593 * the busylun bit.
2594 */
2595 case PHASE_IDLE:
2596 if (host->scsi.disconnectable) {
2597 host->scsi.disconnectable = 0;
2598 host->SCpnt = NULL;
2599 res = res_success;
2600 }
2601 break;
2602
2603 /*
2604 * If the command has connected and done nothing further,
2605 * simply force a disconnect. We also need to clear the
2606 * busylun bit.
2607 */
2608 case PHASE_CONNECTED:
ffd7858d 2609 sbic_arm_write(host, SBIC_CMND, CMND_DISCONNECT);
1da177e4
LT		 2610 host->SCpnt = NULL;
2611 res = res_success_clear;
2612 break;
2613
2614 default:
2615 acornscsi_abortcmd(host, host->SCpnt->tag);
2616 res = res_snooze;
2617 }
2618 local_irq_restore(flags);
2619 } else if (host->origSCpnt == SCpnt) {
2620 /*
2621 * The command will be executed next, but a command
2622 * is currently using the interface. This is similar to
2623 * being on the issue queue, except the busylun bit has
2624 * been set.
2625 */
2626 host->origSCpnt = NULL;
2627//#if (DEBUG & DEBUG_ABORT)
2628 printk("waiting for execution ");
2629//#endif
2630 res = res_success_clear;
2631 } else
2632 printk("unknown ");
2633
2634 return res;
2635}
2636
2637/*
ee0ca6ba 2638 * Prototype: int acornscsi_abort(struct scsi_cmnd *SCpnt)
1da177e4
LT		 2639 * Purpose : abort a command on this host
2640 * Params : SCpnt - command to abort
2641 * Returns : one of SCSI_ABORT_ macros
2642 */
ee0ca6ba 2643int acornscsi_abort(struct scsi_cmnd *SCpnt)
1da177e4
LT		 2644{
2645 AS_Host *host = (AS_Host *) SCpnt->device->host->hostdata;
2646 int result;
2647
2648 host->stats.aborts += 1;
2649
2650#if (DEBUG & DEBUG_ABORT)
2651 {
2652 int asr, ssr;
ffd7858d
RK		 2653 asr = sbic_arm_read(host, SBIC_ASR);
2654 ssr = sbic_arm_read(host, SBIC_SSR);
1da177e4
LT		 2655
2656 printk(KERN_WARNING "acornscsi_abort: ");
2657 print_sbic_status(asr, ssr, host->scsi.phase);
2658 acornscsi_dumplog(host, SCpnt->device->id);
2659 }
2660#endif
2661
2662 printk("scsi%d: ", host->host->host_no);
2663
2664 switch (acornscsi_do_abort(host, SCpnt)) {
2665 /*
2666 * We managed to find the command and cleared it out.
2667 * We do not expect the command to be executing on the
2668 * target, but we have set the busylun bit.
2669 */
2670 case res_success_clear:
2671//#if (DEBUG & DEBUG_ABORT)
2672 printk("clear ");
2673//#endif
2674 clear_bit(SCpnt->device->id * 8 + SCpnt->device->lun, host->busyluns);
2675
2676 /*
2677 * We found the command, and cleared it out. Either
2678 * the command is still known to be executing on the
2679 * target, or the busylun bit is not set.
2680 */
2681 case res_success:
2682//#if (DEBUG & DEBUG_ABORT)
2683 printk("success\n");
2684//#endif
324b9337 2685 result = SUCCESS;
1da177e4
LT		 2686 break;
2687
2688 /*
2689 * We did find the command, but unfortunately we couldn't
2690 * unhook it from ourselves. Wait some more, and if it
2691 * still doesn't complete, reset the interface.
2692 */
2693 case res_snooze:
2694//#if (DEBUG & DEBUG_ABORT)
2695 printk("snooze\n");
2696//#endif
324b9337 2697 result = FAILED;
1da177e4
LT		 2698 break;
2699
2700 /*
2701 * The command could not be found (either because it completed,
2702 * or it got dropped.
2703 */
2704 default:
2705 case res_not_running:
2706 acornscsi_dumplog(host, SCpnt->device->id);
324b9337 2707 result = FAILED;
1da177e4
LT		 2708//#if (DEBUG & DEBUG_ABORT)
2709 printk("not running\n");
2710//#endif
2711 break;
2712 }
2713
2714 return result;
2715}
2716
2717/*
324b9337 2718 * Prototype: int acornscsi_reset(struct scsi_cmnd *SCpnt)
1da177e4
LT		 2719 * Purpose : reset a command on this host/reset this host
2720 * Params : SCpnt - command causing reset
1da177e4
LT		 2721 * Returns : one of SCSI_RESET_ macros
2722 */
324b9337 2723int acornscsi_bus_reset(struct scsi_cmnd *SCpnt)
1da177e4 2724{
ee0ca6ba
H		 2725 AS_Host *host = (AS_Host *)SCpnt->device->host->hostdata;
2726 struct scsi_cmnd *SCptr;
1da177e4
LT		 2727
2728 host->stats.resets += 1;
2729
2730#if (DEBUG & DEBUG_RESET)
2731 {
2732 int asr, ssr;
2733
ffd7858d
RK		 2734 asr = sbic_arm_read(host, SBIC_ASR);
2735 ssr = sbic_arm_read(host, SBIC_SSR);
1da177e4
LT		 2736
2737 printk(KERN_WARNING "acornscsi_reset: ");
2738 print_sbic_status(asr, ssr, host->scsi.phase);
2739 acornscsi_dumplog(host, SCpnt->device->id);
2740 }
2741#endif
2742
2743 acornscsi_dma_stop(host);
2744
1da177e4
LT		 2745 /*
2746 * do hard reset. This resets all devices on this host, and so we
2747 * must set the reset status on all commands.
2748 */
2749 acornscsi_resetcard(host);
2750
1da177e4 2751 while ((SCptr = queue_remove(&host->queues.disconnected)) != NULL)
324b9337 2752 ;
1da177e4 2753
324b9337 2754 return SUCCESS;
1da177e4
LT		 2755}
2756
2757/*==============================================================================================
2758 * initialisation & miscellaneous support
2759 */
2760
2761/*
2762 * Function: char *acornscsi_info(struct Scsi_Host *host)
2763 * Purpose : return a string describing this interface
2764 * Params : host - host to give information on
2765 * Returns : a constant string
2766 */
2767const
2768char *acornscsi_info(struct Scsi_Host *host)
2769{
2770 static char string[100], *p;
2771
2772 p = string;
2773
2774 p += sprintf(string, "%s at port %08lX irq %d v%d.%d.%d"
2775#ifdef CONFIG_SCSI_ACORNSCSI_SYNC
2776 " SYNC"
2777#endif
2778#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
2779 " TAG"
2780#endif
1da177e4 2781#if (DEBUG & DEBUG_NO_WRITE)
a796ef70 2782 " NOWRITE (" __stringify(NO_WRITE) ")"
1da177e4
LT		 2783#endif
2784 , host->hostt->name, host->io_port, host->irq,
2785 VER_MAJOR, VER_MINOR, VER_PATCH);
2786 return string;
2787}
2788
56b8e8e5 2789static int acornscsi_show_info(struct seq_file *m, struct Scsi_Host *instance)
1da177e4 2790{
56b8e8e5 2791 int devidx;
f64a181d 2792 struct scsi_device *scd;
1da177e4 2793 AS_Host *host;
1da177e4
LT		 2794
2795 host = (AS_Host *)instance->hostdata;
2796
56b8e8e5 2797 seq_printf(m, "AcornSCSI driver v%d.%d.%d"
1da177e4
LT		 2798#ifdef CONFIG_SCSI_ACORNSCSI_SYNC
2799 " SYNC"
2800#endif
2801#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
2802 " TAG"
2803#endif
1da177e4 2804#if (DEBUG & DEBUG_NO_WRITE)
a796ef70 2805 " NOWRITE (" __stringify(NO_WRITE) ")"
1da177e4
LT		 2806#endif
2807 "\n\n", VER_MAJOR, VER_MINOR, VER_PATCH);
2808
56b8e8e5 2809 seq_printf(m, "SBIC: WD33C93A Address: %p IRQ : %d\n",
e95a1b65 2810 host->base + SBIC_REGIDX, host->scsi.irq);
1da177e4 2811#ifdef USE_DMAC
56b8e8e5 2812 seq_printf(m, "DMAC: uPC71071 Address: %p IRQ : %d\n\n",
e95a1b65 2813 host->base + DMAC_OFFSET, host->scsi.irq);
1da177e4
LT		 2814#endif
2815
56b8e8e5 2816 seq_printf(m, "Statistics:\n"
1da177e4
LT		 2817 "Queued commands: %-10u Issued commands: %-10u\n"
2818 "Done commands : %-10u Reads : %-10u\n"
2819 "Writes : %-10u Others : %-10u\n"
2820 "Disconnects : %-10u Aborts : %-10u\n"
2821 "Resets : %-10u\n\nLast phases:",
2822 host->stats.queues, host->stats.removes,
2823 host->stats.fins, host->stats.reads,
2824 host->stats.writes, host->stats.miscs,
2825 host->stats.disconnects, host->stats.aborts,
2826 host->stats.resets);
2827
2828 for (devidx = 0; devidx < 9; devidx ++) {
2829 unsigned int statptr, prev;
2830
56b8e8e5 2831 seq_printf(m, "\n%c:", devidx == 8 ? 'H' : ('0' + devidx));
1da177e4
LT		 2832 statptr = host->status_ptr[devidx] - 10;
2833
2834 if ((signed int)statptr < 0)
2835 statptr += STATUS_BUFFER_SIZE;
2836
2837 prev = host->status[devidx][statptr].when;
2838
2839 for (; statptr != host->status_ptr[devidx]; statptr = (statptr + 1) & (STATUS_BUFFER_SIZE - 1)) {
2840 if (host->status[devidx][statptr].when) {
56b8e8e5 2841 seq_printf(m, "%c%02X:%02X+%2ld",
1da177e4
LT		 2842 host->status[devidx][statptr].irq ? '-' : ' ',
2843 host->status[devidx][statptr].ph,
2844 host->status[devidx][statptr].ssr,
2845 (host->status[devidx][statptr].when - prev) < 100 ?
2846 (host->status[devidx][statptr].when - prev) : 99);
2847 prev = host->status[devidx][statptr].when;
2848 }
2849 }
2850 }
2851
56b8e8e5 2852 seq_printf(m, "\nAttached devices:\n");
1da177e4
LT		 2853
2854 shost_for_each_device(scd, instance) {
56b8e8e5
AV		 2855 seq_printf(m, "Device/Lun TaggedQ Sync\n");
2856 seq_printf(m, " %d/%d ", scd->id, scd->lun);
1da177e4 2857 if (scd->tagged_supported)
56b8e8e5 2858 seq_printf(m, "%3sabled(%3d) ",
1da177e4
LT		 2859 scd->simple_tags ? "en" : "dis",
2860 scd->current_tag);
2861 else
56b8e8e5 2862 seq_printf(m, "unsupported ");
1da177e4
LT		 2863
2864 if (host->device[scd->id].sync_xfer & 15)
56b8e8e5 2865 seq_printf(m, "offset %d, %d ns\n",
1da177e4
LT		 2866 host->device[scd->id].sync_xfer & 15,
2867 acornscsi_getperiod(host->device[scd->id].sync_xfer));
2868 else
56b8e8e5 2869 seq_printf(m, "async\n");
1da177e4 2870
1da177e4 2871 }
56b8e8e5 2872 return 0;
1da177e4
LT		 2873}
2874
d0be4a7d 2875static struct scsi_host_template acornscsi_template = {
1da177e4 2876 .module = THIS_MODULE,
56b8e8e5 2877 .show_info = acornscsi_show_info,
1da177e4
LT		 2878 .name = "AcornSCSI",
2879 .info = acornscsi_info,
2880 .queuecommand = acornscsi_queuecmd,
324b9337
RK		 2881 .eh_abort_handler = acornscsi_abort,
2882 .eh_bus_reset_handler = acornscsi_bus_reset,
1da177e4
LT		 2883 .can_queue = 16,
2884 .this_id = 7,
2885 .sg_tablesize = SG_ALL,
2886 .cmd_per_lun = 2,
1da177e4
LT		 2887 .use_clustering = DISABLE_CLUSTERING,
2888 .proc_name = "acornscsi",
2889};
2890
6f039790 2891static int acornscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
1da177e4
LT		 2892{
2893 struct Scsi_Host *host;
2894 AS_Host *ashost;
e95a1b65 2895 int ret;
1da177e4 2896
e95a1b65
RK		 2897 ret = ecard_request_resources(ec);
2898 if (ret)
1da177e4
LT		 2899 goto out;
2900
e95a1b65
RK		 2901 host = scsi_host_alloc(&acornscsi_template, sizeof(AS_Host));
2902 if (!host) {
2903 ret = -ENOMEM;
2904 goto out_release;
2905 }
2906
1da177e4
LT		 2907 ashost = (AS_Host *)host->hostdata;
2908
e95a1b65
RK		 2909 ashost->base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
2910 ashost->fast = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
2911 if (!ashost->base || !ashost->fast)
2912 goto out_put;
1da177e4 2913
e95a1b65
RK		 2914 host->irq = ec->irq;
2915 ashost->host = host;
2916 ashost->scsi.irq = host->irq;
1da177e4 2917
e95a1b65 2918 ec->irqaddr = ashost->fast + INT_REG;
1da177e4
LT		 2919 ec->irqmask = 0x0a;
2920
4909cc2b 2921 ret = request_irq(host->irq, acornscsi_intr, 0, "acornscsi", ashost);
1da177e4
LT		 2922 if (ret) {
2923 printk(KERN_CRIT "scsi%d: IRQ%d not free: %d\n",
2924 host->host_no, ashost->scsi.irq, ret);
e95a1b65 2925 goto out_put;
1da177e4
LT		 2926 }
2927
2928 memset(&ashost->stats, 0, sizeof (ashost->stats));
2929 queue_initialise(&ashost->queues.issue);
2930 queue_initialise(&ashost->queues.disconnected);
2931 msgqueue_initialise(&ashost->scsi.msgs);
2932
2933 acornscsi_resetcard(ashost);
2934
2935 ret = scsi_add_host(host, &ec->dev);
2936 if (ret)
e95a1b65 2937 goto out_irq;
1da177e4
LT		 2938
2939 scsi_scan_host(host);
2940 goto out;
2941
e95a1b65 2942 out_irq:
1da177e4 2943 free_irq(host->irq, ashost);
e95a1b65
RK		 2944 msgqueue_free(&ashost->scsi.msgs);
2945 queue_free(&ashost->queues.disconnected);
2946 queue_free(&ashost->queues.issue);
2947 out_put:
2948 ecardm_iounmap(ec, ashost->fast);
2949 ecardm_iounmap(ec, ashost->base);
1da177e4 2950 scsi_host_put(host);
e95a1b65
RK		 2951 out_release:
2952 ecard_release_resources(ec);
1da177e4
LT		 2953 out:
2954 return ret;
2955}
2956
6f039790 2957static void acornscsi_remove(struct expansion_card *ec)
1da177e4
LT		 2958{
2959 struct Scsi_Host *host = ecard_get_drvdata(ec);
2960 AS_Host *ashost = (AS_Host *)host->hostdata;
2961
2962 ecard_set_drvdata(ec, NULL);
2963 scsi_remove_host(host);
2964
2965 /*
2966 * Put card into RESET state
2967 */
e95a1b65 2968 writeb(0x80, ashost->fast + PAGE_REG);
1da177e4
LT		 2969
2970 free_irq(host->irq, ashost);
2971
1da177e4
LT		 2972 msgqueue_free(&ashost->scsi.msgs);
2973 queue_free(&ashost->queues.disconnected);
2974 queue_free(&ashost->queues.issue);
e95a1b65
RK		 2975 ecardm_iounmap(ec, ashost->fast);
2976 ecardm_iounmap(ec, ashost->base);
1da177e4 2977 scsi_host_put(host);
e95a1b65 2978 ecard_release_resources(ec);
1da177e4
LT		 2979}
2980
2981static const struct ecard_id acornscsi_cids[] = {
2982 { MANU_ACORN, PROD_ACORN_SCSI },
2983 { 0xffff, 0xffff },
2984};
2985
2986static struct ecard_driver acornscsi_driver = {
2987 .probe = acornscsi_probe,
6f039790 2988 .remove = acornscsi_remove,
1da177e4
LT		 2989 .id_table = acornscsi_cids,
2990 .drv = {
2991 .name = "acornscsi",
2992 },
2993};
2994
2995static int __init acornscsi_init(void)
2996{
2997 return ecard_register_driver(&acornscsi_driver);
2998}
2999
3000static void __exit acornscsi_exit(void)
3001{
3002 ecard_remove_driver(&acornscsi_driver);
3003}
3004
3005module_init(acornscsi_init);
3006module_exit(acornscsi_exit);
3007
3008MODULE_AUTHOR("Russell King");
3009MODULE_DESCRIPTION("AcornSCSI driver");
3010MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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