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1da177e4
LT		 1/* -*- mode: c; c-basic-offset: 8 -*- */
2
3/* NCR (or Symbios) 53c700 and 53c700-66 Driver
4 *
5 * Copyright (C) 2001 by James.Bottomley@HansenPartnership.com
6**-----------------------------------------------------------------------------
7**
8** This program is free software; you can redistribute it and/or modify
9** it under the terms of the GNU General Public License as published by
10** the Free Software Foundation; either version 2 of the License, or
11** (at your option) any later version.
12**
13** This program is distributed in the hope that it will be useful,
14** but WITHOUT ANY WARRANTY; without even the implied warranty of
15** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16** GNU General Public License for more details.
17**
18** You should have received a copy of the GNU General Public License
19** along with this program; if not, write to the Free Software
20** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21**
22**-----------------------------------------------------------------------------
23 */
24
25/* Notes:
26 *
27 * This driver is designed exclusively for these chips (virtually the
28 * earliest of the scripts engine chips). They need their own drivers
29 * because they are missing so many of the scripts and snazzy register
30 * features of their elder brothers (the 710, 720 and 770).
31 *
32 * The 700 is the lowliest of the line, it can only do async SCSI.
33 * The 700-66 can at least do synchronous SCSI up to 10MHz.
34 *
35 * The 700 chip has no host bus interface logic of its own. However,
36 * it is usually mapped to a location with well defined register
37 * offsets. Therefore, if you can determine the base address and the
38 * irq your board incorporating this chip uses, you can probably use
39 * this driver to run it (although you'll probably have to write a
40 * minimal wrapper for the purpose---see the NCR_D700 driver for
41 * details about how to do this).
42 *
43 *
44 * TODO List:
45 *
46 * 1. Better statistics in the proc fs
47 *
48 * 2. Implement message queue (queues SCSI messages like commands) and make
49 * the abort and device reset functions use them.
50 * */
51
52/* CHANGELOG
53 *
54 * Version 2.8
55 *
56 * Fixed bad bug affecting tag starvation processing (previously the
57 * driver would hang the system if too many tags starved. Also fixed
58 * bad bug having to do with 10 byte command processing and REQUEST
59 * SENSE (the command would loop forever getting a transfer length
60 * mismatch in the CMD phase).
61 *
62 * Version 2.7
63 *
64 * Fixed scripts problem which caused certain devices (notably CDRWs)
65 * to hang on initial INQUIRY. Updated NCR_700_readl/writel to use
66 * __raw_readl/writel for parisc compatibility (Thomas
67 * Bogendoerfer). Added missing SCp->request_bufflen initialisation
68 * for sense requests (Ryan Bradetich).
69 *
70 * Version 2.6
71 *
72 * Following test of the 64 bit parisc kernel by Richard Hirst,
73 * several problems have now been corrected. Also adds support for
74 * consistent memory allocation.
75 *
76 * Version 2.5
77 *
78 * More Compatibility changes for 710 (now actually works). Enhanced
79 * support for odd clock speeds which constrain SDTR negotiations.
80 * correct cacheline separation for scsi messages and status for
81 * incoherent architectures. Use of the pci mapping functions on
82 * buffers to begin support for 64 bit drivers.
83 *
84 * Version 2.4
85 *
86 * Added support for the 53c710 chip (in 53c700 emulation mode only---no
87 * special 53c710 instructions or registers are used).
88 *
89 * Version 2.3
90 *
91 * More endianness/cache coherency changes.
92 *
93 * Better bad device handling (handles devices lying about tag
94 * queueing support and devices which fail to provide sense data on
95 * contingent allegiance conditions)
96 *
97 * Many thanks to Richard Hirst <rhirst@linuxcare.com> for patiently
98 * debugging this driver on the parisc architecture and suggesting
99 * many improvements and bug fixes.
100 *
101 * Thanks also go to Linuxcare Inc. for providing several PARISC
102 * machines for me to debug the driver on.
103 *
104 * Version 2.2
105 *
106 * Made the driver mem or io mapped; added endian invariance; added
107 * dma cache flushing operations for architectures which need it;
108 * added support for more varied clocking speeds.
109 *
110 * Version 2.1
111 *
112 * Initial modularisation from the D700. See NCR_D700.c for the rest of
113 * the changelog.
114 * */
115#define NCR_700_VERSION "2.8"
116
1da177e4
LT		 117#include <linux/kernel.h>
118#include <linux/types.h>
119#include <linux/string.h>
5a0e3ad6 120#include <linux/slab.h>
1da177e4
LT		 121#include <linux/ioport.h>
122#include <linux/delay.h>
123#include <linux/spinlock.h>
124#include <linux/completion.h>
1da177e4
LT		 125#include <linux/init.h>
126#include <linux/proc_fs.h>
127#include <linux/blkdev.h>
128#include <linux/module.h>
129#include <linux/interrupt.h>
017560fc 130#include <linux/device.h>
1da177e4
LT		 131#include <asm/dma.h>
132#include <asm/system.h>
133#include <asm/io.h>
134#include <asm/pgtable.h>
135#include <asm/byteorder.h>
136
137#include <scsi/scsi.h>
138#include <scsi/scsi_cmnd.h>
139#include <scsi/scsi_dbg.h>
140#include <scsi/scsi_eh.h>
141#include <scsi/scsi_host.h>
142#include <scsi/scsi_tcq.h>
143#include <scsi/scsi_transport.h>
144#include <scsi/scsi_transport_spi.h>
145
146#include "53c700.h"
147
148/* NOTE: For 64 bit drivers there are points in the code where we use
149 * a non dereferenceable pointer to point to a structure in dma-able
150 * memory (which is 32 bits) so that we can use all of the structure
151 * operations but take the address at the end. This macro allows us
152 * to truncate the 64 bit pointer down to 32 bits without the compiler
153 * complaining */
154#define to32bit(x) ((__u32)((unsigned long)(x)))
155
156#ifdef NCR_700_DEBUG
157#define STATIC
158#else
159#define STATIC static
160#endif
161
162MODULE_AUTHOR("James Bottomley");
163MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");
164MODULE_LICENSE("GPL");
165
166/* This is the script */
167#include "53c700_d.h"
168
169
170STATIC int NCR_700_queuecommand(struct scsi_cmnd *, void (*done)(struct scsi_cmnd *));
171STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt);
172STATIC int NCR_700_bus_reset(struct scsi_cmnd * SCpnt);
1da177e4
LT		 173STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt);
174STATIC void NCR_700_chip_setup(struct Scsi_Host *host);
175STATIC void NCR_700_chip_reset(struct Scsi_Host *host);
0f13fc09 176STATIC int NCR_700_slave_alloc(struct scsi_device *SDpnt);
1da177e4
LT		 177STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt);
178STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt);
e881a172 179static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth, int reason);
1da177e4
LT		 180static int NCR_700_change_queue_type(struct scsi_device *SDpnt, int depth);
181
182STATIC struct device_attribute *NCR_700_dev_attrs[];
183
184STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
185
186static char *NCR_700_phase[] = {
187 "",
188 "after selection",
189 "before command phase",
190 "after command phase",
191 "after status phase",
192 "after data in phase",
193 "after data out phase",
194 "during data phase",
195};
196
197static char *NCR_700_condition[] = {
198 "",
199 "NOT MSG_OUT",
200 "UNEXPECTED PHASE",
201 "NOT MSG_IN",
202 "UNEXPECTED MSG",
203 "MSG_IN",
204 "SDTR_MSG RECEIVED",
205 "REJECT_MSG RECEIVED",
206 "DISCONNECT_MSG RECEIVED",
207 "MSG_OUT",
208 "DATA_IN",
209
210};
211
212static char *NCR_700_fatal_messages[] = {
213 "unexpected message after reselection",
214 "still MSG_OUT after message injection",
215 "not MSG_IN after selection",
216 "Illegal message length received",
217};
218
219static char *NCR_700_SBCL_bits[] = {
220 "IO ",
221 "CD ",
222 "MSG ",
223 "ATN ",
224 "SEL ",
225 "BSY ",
226 "ACK ",
227 "REQ ",
228};
229
230static char *NCR_700_SBCL_to_phase[] = {
231 "DATA_OUT",
232 "DATA_IN",
233 "CMD_OUT",
234 "STATE",
235 "ILLEGAL PHASE",
236 "ILLEGAL PHASE",
237 "MSG OUT",
238 "MSG IN",
239};
240
1da177e4
LT		 241/* This translates the SDTR message offset and period to a value
242 * which can be loaded into the SXFER_REG.
243 *
244 * NOTE: According to SCSI-2, the true transfer period (in ns) is
245 * actually four times this period value */
246static inline __u8
247NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
248 __u8 offset, __u8 period)
249{
250 int XFERP;
251
252 __u8 min_xferp = (hostdata->chip710
253 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
254 __u8 max_offset = (hostdata->chip710
255 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
256
257 if(offset == 0)
258 return 0;
259
260 if(period < hostdata->min_period) {
6ea3c0b2 261 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4);
1da177e4
LT		 262 period = hostdata->min_period;
263 }
264 XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
265 if(offset > max_offset) {
266 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
267 offset, max_offset);
268 offset = max_offset;
269 }
270 if(XFERP < min_xferp) {
1da177e4
LT		 271 XFERP = min_xferp;
272 }
273 return (offset & 0x0f) | (XFERP & 0x07)<<4;
274}
275
276static inline __u8
277NCR_700_get_SXFER(struct scsi_device *SDp)
278{
279 struct NCR_700_Host_Parameters *hostdata =
280 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
281
282 return NCR_700_offset_period_to_sxfer(hostdata,
283 spi_offset(SDp->sdev_target),
284 spi_period(SDp->sdev_target));
285}
286
287struct Scsi_Host *
288NCR_700_detect(struct scsi_host_template *tpnt,
289 struct NCR_700_Host_Parameters *hostdata, struct device *dev)
290{
291 dma_addr_t pScript, pSlots;
292 __u8 *memory;
293 __u32 *script;
294 struct Scsi_Host *host;
295 static int banner = 0;
296 int j;
297
298 if(tpnt->sdev_attrs == NULL)
299 tpnt->sdev_attrs = NCR_700_dev_attrs;
300
301 memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
302 &pScript, GFP_KERNEL);
303 if(memory == NULL) {
304 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
305 return NULL;
306 }
307
308 script = (__u32 *)memory;
309 hostdata->msgin = memory + MSGIN_OFFSET;
310 hostdata->msgout = memory + MSGOUT_OFFSET;
311 hostdata->status = memory + STATUS_OFFSET;
1da177e4
LT		 312 hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
313 hostdata->dev = dev;
6391a113 314
1da177e4
LT		 315 pSlots = pScript + SLOTS_OFFSET;
316
317 /* Fill in the missing routines from the host template */
318 tpnt->queuecommand = NCR_700_queuecommand;
319 tpnt->eh_abort_handler = NCR_700_abort;
1da177e4
LT		 320 tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
321 tpnt->eh_host_reset_handler = NCR_700_host_reset;
322 tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
323 tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
324 tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
325 tpnt->use_clustering = ENABLE_CLUSTERING;
326 tpnt->slave_configure = NCR_700_slave_configure;
327 tpnt->slave_destroy = NCR_700_slave_destroy;
0f13fc09 328 tpnt->slave_alloc = NCR_700_slave_alloc;
1da177e4
LT		 329 tpnt->change_queue_depth = NCR_700_change_queue_depth;
330 tpnt->change_queue_type = NCR_700_change_queue_type;
6391a113 331
1da177e4
LT		 332 if(tpnt->name == NULL)
333 tpnt->name = "53c700";
334 if(tpnt->proc_name == NULL)
335 tpnt->proc_name = "53c700";
1da177e4
LT		 336
337 host = scsi_host_alloc(tpnt, 4);
338 if (!host)
339 return NULL;
340 memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
341 * NCR_700_COMMAND_SLOTS_PER_HOST);
6391a113 342 for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
1da177e4
LT		 343 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
344 - (unsigned long)&hostdata->slots[0].SG[0]);
345 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
346 if(j == 0)
347 hostdata->free_list = &hostdata->slots[j];
348 else
349 hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
350 hostdata->slots[j].state = NCR_700_SLOT_FREE;
351 }
352
6391a113 353 for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)
1da177e4 354 script[j] = bS_to_host(SCRIPT[j]);
1da177e4
LT		 355
356 /* adjust all labels to be bus physical */
6391a113 357 for (j = 0; j < PATCHES; j++)
1da177e4 358 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
1da177e4 359 /* now patch up fixed addresses. */
d3fa72e4 360 script_patch_32(hostdata->dev, script, MessageLocation,
1da177e4 361 pScript + MSGOUT_OFFSET);
d3fa72e4 362 script_patch_32(hostdata->dev, script, StatusAddress,
1da177e4 363 pScript + STATUS_OFFSET);
d3fa72e4 364 script_patch_32(hostdata->dev, script, ReceiveMsgAddress,
1da177e4
LT		 365 pScript + MSGIN_OFFSET);
366
367 hostdata->script = script;
368 hostdata->pScript = pScript;
369 dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
370 hostdata->state = NCR_700_HOST_FREE;
371 hostdata->cmd = NULL;
2b89dad0 372 host->max_id = 8;
1da177e4
LT		 373 host->max_lun = NCR_700_MAX_LUNS;
374 BUG_ON(NCR_700_transport_template == NULL);
375 host->transportt = NCR_700_transport_template;
56fece20 376 host->unique_id = (unsigned long)hostdata->base;
1da177e4
LT		 377 hostdata->eh_complete = NULL;
378 host->hostdata[0] = (unsigned long)hostdata;
379 /* kick the chip */
380 NCR_700_writeb(0xff, host, CTEST9_REG);
6391a113 381 if (hostdata->chip710)
1da177e4
LT		 382 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
383 else
384 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
385 hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
6391a113 386 if (banner == 0) {
1da177e4
LT		 387 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
388 banner = 1;
389 }
390 printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
6391a113 391 hostdata->chip710 ? "53c710" :
1da177e4
LT		 392 (hostdata->fast ? "53c700-66" : "53c700"),
393 hostdata->rev, hostdata->differential ?
394 "(Differential)" : "");
395 /* reset the chip */
396 NCR_700_chip_reset(host);
397
398 if (scsi_add_host(host, dev)) {
399 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
400 scsi_host_put(host);
401 return NULL;
402 }
403
404 spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
405 SPI_SIGNAL_SE;
406
407 return host;
408}
409
410int
411NCR_700_release(struct Scsi_Host *host)
412{
413 struct NCR_700_Host_Parameters *hostdata =
414 (struct NCR_700_Host_Parameters *)host->hostdata[0];
415
416 dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
417 hostdata->script, hostdata->pScript);
418 return 1;
419}
420
421static inline __u8
422NCR_700_identify(int can_disconnect, __u8 lun)
423{
424 return IDENTIFY_BASE |
425 ((can_disconnect) ? 0x40 : 0) |
426 (lun & NCR_700_LUN_MASK);
427}
428
429/*
430 * Function : static int data_residual (Scsi_Host *host)
431 *
432 * Purpose : return residual data count of what's in the chip. If you
433 * really want to know what this function is doing, it's almost a
434 * direct transcription of the algorithm described in the 53c710
435 * guide, except that the DBC and DFIFO registers are only 6 bits
436 * wide on a 53c700.
437 *
438 * Inputs : host - SCSI host */
439static inline int
440NCR_700_data_residual (struct Scsi_Host *host) {
441 struct NCR_700_Host_Parameters *hostdata =
442 (struct NCR_700_Host_Parameters *)host->hostdata[0];
443 int count, synchronous = 0;
444 unsigned int ddir;
445
446 if(hostdata->chip710) {
447 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
448 (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
449 } else {
450 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
451 (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
452 }
453
454 if(hostdata->fast)
455 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
456
457 /* get the data direction */
458 ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
459
460 if (ddir) {
461 /* Receive */
462 if (synchronous)
463 count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
464 else
465 if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
466 ++count;
467 } else {
468 /* Send */
469 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
470 if (sstat & SODL_REG_FULL)
471 ++count;
472 if (synchronous && (sstat & SODR_REG_FULL))
473 ++count;
474 }
475#ifdef NCR_700_DEBUG
476 if(count)
477 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
478#endif
479 return count;
480}
481
482/* print out the SCSI wires and corresponding phase from the SBCL register
483 * in the chip */
484static inline char *
485sbcl_to_string(__u8 sbcl)
486{
487 int i;
488 static char ret[256];
489
490 ret[0]='\0';
491 for(i=0; i<8; i++) {
492 if((1<<i) & sbcl)
493 strcat(ret, NCR_700_SBCL_bits[i]);
494 }
495 strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
496 return ret;
497}
498
499static inline __u8
500bitmap_to_number(__u8 bitmap)
501{
502 __u8 i;
503
504 for(i=0; i<8 && !(bitmap &(1<<i)); i++)
505 ;
506 return i;
507}
508
509/* Pull a slot off the free list */
510STATIC struct NCR_700_command_slot *
511find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
512{
513 struct NCR_700_command_slot *slot = hostdata->free_list;
514
515 if(slot == NULL) {
516 /* sanity check */
517 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
518 printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
519 return NULL;
520 }
521
522 if(slot->state != NCR_700_SLOT_FREE)
523 /* should panic! */
524 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
525
526
527 hostdata->free_list = slot->ITL_forw;
528 slot->ITL_forw = NULL;
529
530
531 /* NOTE: set the state to busy here, not queued, since this
532 * indicates the slot is in use and cannot be run by the IRQ
533 * finish routine. If we cannot queue the command when it
534 * is properly build, we then change to NCR_700_SLOT_QUEUED */
535 slot->state = NCR_700_SLOT_BUSY;
67d59dfd 536 slot->flags = 0;
1da177e4
LT		 537 hostdata->command_slot_count++;
538
539 return slot;
540}
541
542STATIC void
543free_slot(struct NCR_700_command_slot *slot,
544 struct NCR_700_Host_Parameters *hostdata)
545{
546 if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
547 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
548 }
549 if(slot->state == NCR_700_SLOT_FREE) {
550 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
551 }
552
553 slot->resume_offset = 0;
554 slot->cmnd = NULL;
555 slot->state = NCR_700_SLOT_FREE;
556 slot->ITL_forw = hostdata->free_list;
557 hostdata->free_list = slot;
558 hostdata->command_slot_count--;
559}
560
561
562/* This routine really does very little. The command is indexed on
563 the ITL and (if tagged) the ITLQ lists in _queuecommand */
564STATIC void
565save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
566 struct scsi_cmnd *SCp, __u32 dsp)
567{
568 /* Its just possible that this gets executed twice */
569 if(SCp != NULL) {
570 struct NCR_700_command_slot *slot =
571 (struct NCR_700_command_slot *)SCp->host_scribble;
572
573 slot->resume_offset = dsp;
574 }
575 hostdata->state = NCR_700_HOST_FREE;
576 hostdata->cmd = NULL;
577}
578
579STATIC inline void
580NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
581 struct NCR_700_command_slot *slot)
582{
583 if(SCp->sc_data_direction != DMA_NONE &&
3258a4d5
FT		 584 SCp->sc_data_direction != DMA_BIDIRECTIONAL)
585 scsi_dma_unmap(SCp);
1da177e4
LT		 586}
587
588STATIC inline void
589NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
590 struct scsi_cmnd *SCp, int result)
591{
592 hostdata->state = NCR_700_HOST_FREE;
593 hostdata->cmd = NULL;
594
595 if(SCp != NULL) {
596 struct NCR_700_command_slot *slot =
597 (struct NCR_700_command_slot *)SCp->host_scribble;
598
0f13fc09 599 dma_unmap_single(hostdata->dev, slot->pCmd,
64a87b24 600 MAX_COMMAND_SIZE, DMA_TO_DEVICE);
67d59dfd 601 if (slot->flags == NCR_700_FLAG_AUTOSENSE) {
0f13fc09 602 char *cmnd = NCR_700_get_sense_cmnd(SCp->device);
1da177e4
LT		 603#ifdef NCR_700_DEBUG
604 printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
605 SCp, SCp->cmnd[7], result);
606 scsi_print_sense("53c700", SCp);
607
608#endif
b80ca4f7
FT		 609 dma_unmap_single(hostdata->dev, slot->dma_handle,
610 SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1da177e4
LT		 611 /* restore the old result if the request sense was
612 * successful */
c603d04e 613 if (result == 0)
0f13fc09 614 result = cmnd[7];
c603d04e
JB		 615 /* restore the original length */
616 SCp->cmd_len = cmnd[8];
67d59dfd 617 } else
0f13fc09 618 NCR_700_unmap(hostdata, SCp, slot);
67d59dfd 619
1da177e4
LT		 620 free_slot(slot, hostdata);
621#ifdef NCR_700_DEBUG
622 if(NCR_700_get_depth(SCp->device) == 0 ||
623 NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
624 printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
625 NCR_700_get_depth(SCp->device));
626#endif /* NCR_700_DEBUG */
627 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
628
629 SCp->host_scribble = NULL;
630 SCp->result = result;
631 SCp->scsi_done(SCp);
632 } else {
633 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
634 }
635}
636
637
638STATIC void
639NCR_700_internal_bus_reset(struct Scsi_Host *host)
640{
641 /* Bus reset */
642 NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
643 udelay(50);
644 NCR_700_writeb(0, host, SCNTL1_REG);
645
646}
647
648STATIC void
649NCR_700_chip_setup(struct Scsi_Host *host)
650{
651 struct NCR_700_Host_Parameters *hostdata =
652 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1da177e4
LT		 653 __u8 min_period;
654 __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
655
656 if(hostdata->chip710) {
f67a9c15
TB		 657 __u8 burst_disable = 0;
658 __u8 burst_length = 0;
659
660 switch (hostdata->burst_length) {
661 case 1:
662 burst_length = BURST_LENGTH_1;
663 break;
664 case 2:
665 burst_length = BURST_LENGTH_2;
666 break;
667 case 4:
668 burst_length = BURST_LENGTH_4;
669 break;
670 case 8:
671 burst_length = BURST_LENGTH_8;
672 break;
673 default:
674 burst_disable = BURST_DISABLE;
675 break;
676 }
63273134 677 hostdata->dcntl_extra |= COMPAT_700_MODE;
1da177e4 678
63273134 679 NCR_700_writeb(hostdata->dcntl_extra, host, DCNTL_REG);
f67a9c15 680 NCR_700_writeb(burst_length | hostdata->dmode_extra,
1da177e4 681 host, DMODE_710_REG);
63273134
KJ		 682 NCR_700_writeb(burst_disable | hostdata->ctest7_extra |
683 (hostdata->differential ? DIFF : 0),
684 host, CTEST7_REG);
1da177e4
LT		 685 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
686 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
687 | AUTO_ATN, host, SCNTL0_REG);
688 } else {
689 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
690 host, DMODE_700_REG);
691 NCR_700_writeb(hostdata->differential ?
692 DIFF : 0, host, CTEST7_REG);
693 if(hostdata->fast) {
694 /* this is for 700-66, does nothing on 700 */
695 NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
696 | GENERATE_RECEIVE_PARITY, host,
697 CTEST8_REG);
698 } else {
699 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
700 | PARITY | AUTO_ATN, host, SCNTL0_REG);
701 }
702 }
703
704 NCR_700_writeb(1 << host->this_id, host, SCID_REG);
705 NCR_700_writeb(0, host, SBCL_REG);
706 NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
707
708 NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
709 | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
710
711 NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
712 NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
713 if(hostdata->clock > 75) {
714 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
715 /* do the best we can, but the async clock will be out
716 * of spec: sync divider 2, async divider 3 */
717 DEBUG(("53c700: sync 2 async 3\n"));
718 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
63273134 719 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
1da177e4
LT		 720 hostdata->sync_clock = hostdata->clock/2;
721 } else if(hostdata->clock > 50 && hostdata->clock <= 75) {
722 /* sync divider 1.5, async divider 3 */
723 DEBUG(("53c700: sync 1.5 async 3\n"));
724 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
63273134 725 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
1da177e4
LT		 726 hostdata->sync_clock = hostdata->clock*2;
727 hostdata->sync_clock /= 3;
728
729 } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
730 /* sync divider 1, async divider 2 */
731 DEBUG(("53c700: sync 1 async 2\n"));
732 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
63273134 733 NCR_700_writeb(ASYNC_DIV_2_0 | hostdata->dcntl_extra, host, DCNTL_REG);
1da177e4
LT		 734 hostdata->sync_clock = hostdata->clock;
735 } else if(hostdata->clock > 25 && hostdata->clock <=37) {
736 /* sync divider 1, async divider 1.5 */
737 DEBUG(("53c700: sync 1 async 1.5\n"));
738 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
63273134 739 NCR_700_writeb(ASYNC_DIV_1_5 | hostdata->dcntl_extra, host, DCNTL_REG);
1da177e4
LT		 740 hostdata->sync_clock = hostdata->clock;
741 } else {
742 DEBUG(("53c700: sync 1 async 1\n"));
743 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
63273134 744 NCR_700_writeb(ASYNC_DIV_1_0 | hostdata->dcntl_extra, host, DCNTL_REG);
1da177e4
LT		 745 /* sync divider 1, async divider 1 */
746 hostdata->sync_clock = hostdata->clock;
747 }
748 /* Calculate the actual minimum period that can be supported
749 * by our synchronous clock speed. See the 710 manual for
750 * exact details of this calculation which is based on a
751 * setting of the SXFER register */
752 min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
753 hostdata->min_period = NCR_700_MIN_PERIOD;
754 if(min_period > NCR_700_MIN_PERIOD)
755 hostdata->min_period = min_period;
756}
757
758STATIC void
759NCR_700_chip_reset(struct Scsi_Host *host)
760{
761 struct NCR_700_Host_Parameters *hostdata =
762 (struct NCR_700_Host_Parameters *)host->hostdata[0];
763 if(hostdata->chip710) {
764 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
765 udelay(100);
766
767 NCR_700_writeb(0, host, ISTAT_REG);
768 } else {
769 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
770 udelay(100);
771
772 NCR_700_writeb(0, host, DCNTL_REG);
773 }
774
775 mdelay(1000);
776
777 NCR_700_chip_setup(host);
778}
779
780/* The heart of the message processing engine is that the instruction
781 * immediately after the INT is the normal case (and so must be CLEAR
782 * ACK). If we want to do something else, we call that routine in
783 * scripts and set temp to be the normal case + 8 (skipping the CLEAR
784 * ACK) so that the routine returns correctly to resume its activity
785 * */
786STATIC __u32
787process_extended_message(struct Scsi_Host *host,
788 struct NCR_700_Host_Parameters *hostdata,
789 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
790{
791 __u32 resume_offset = dsp, temp = dsp + 8;
792 __u8 pun = 0xff, lun = 0xff;
793
794 if(SCp != NULL) {
795 pun = SCp->device->id;
796 lun = SCp->device->lun;
797 }
798
799 switch(hostdata->msgin[2]) {
800 case A_SDTR_MSG:
801 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
802 struct scsi_target *starget = SCp->device->sdev_target;
803 __u8 period = hostdata->msgin[3];
804 __u8 offset = hostdata->msgin[4];
805
806 if(offset == 0 || period == 0) {
807 offset = 0;
808 period = 0;
809 }
810
811 spi_offset(starget) = offset;
812 spi_period(starget) = period;
813
814 if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
815 spi_display_xfer_agreement(starget);
816 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
817 }
818
819 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
820 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
821
822 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
823 host, SXFER_REG);
824
825 } else {
826 /* SDTR message out of the blue, reject it */
017560fc
JG		 827 shost_printk(KERN_WARNING, host,
828 "Unexpected SDTR msg\n");
1da177e4 829 hostdata->msgout[0] = A_REJECT_MSG;
d3fa72e4
RB		 830 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
831 script_patch_16(hostdata->dev, hostdata->script,
832 MessageCount, 1);
1da177e4
LT		 833 /* SendMsgOut returns, so set up the return
834 * address */
835 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
836 }
837 break;
838
839 case A_WDTR_MSG:
840 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
841 host->host_no, pun, lun);
842 hostdata->msgout[0] = A_REJECT_MSG;
d3fa72e4
RB		 843 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
844 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
845 1);
1da177e4
LT		 846 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
847
848 break;
849
850 default:
851 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
852 host->host_no, pun, lun,
853 NCR_700_phase[(dsps & 0xf00) >> 8]);
1abfd370 854 spi_print_msg(hostdata->msgin);
1da177e4
LT		 855 printk("\n");
856 /* just reject it */
857 hostdata->msgout[0] = A_REJECT_MSG;
d3fa72e4
RB		 858 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
859 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
860 1);
1da177e4
LT		 861 /* SendMsgOut returns, so set up the return
862 * address */
863 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
864 }
865 NCR_700_writel(temp, host, TEMP_REG);
866 return resume_offset;
867}
868
869STATIC __u32
870process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
871 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
872{
873 /* work out where to return to */
874 __u32 temp = dsp + 8, resume_offset = dsp;
875 __u8 pun = 0xff, lun = 0xff;
876
877 if(SCp != NULL) {
878 pun = SCp->device->id;
879 lun = SCp->device->lun;
880 }
881
882#ifdef NCR_700_DEBUG
883 printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
884 NCR_700_phase[(dsps & 0xf00) >> 8]);
1abfd370 885 spi_print_msg(hostdata->msgin);
1da177e4
LT		 886 printk("\n");
887#endif
888
889 switch(hostdata->msgin[0]) {
890
891 case A_EXTENDED_MSG:
892 resume_offset = process_extended_message(host, hostdata, SCp,
893 dsp, dsps);
894 break;
895
896 case A_REJECT_MSG:
897 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
898 /* Rejected our sync negotiation attempt */
899 spi_period(SCp->device->sdev_target) =
900 spi_offset(SCp->device->sdev_target) = 0;
901 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
902 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
903 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
904 /* rejected our first simple tag message */
017560fc
JG		 905 scmd_printk(KERN_WARNING, SCp,
906 "Rejected first tag queue attempt, turning off tag queueing\n");
1da177e4
LT		 907 /* we're done negotiating */
908 NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
017560fc 909 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1da177e4
LT		 910 SCp->device->tagged_supported = 0;
911 scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
912 } else {
017560fc
JG		 913 shost_printk(KERN_WARNING, host,
914 "(%d:%d) Unexpected REJECT Message %s\n",
915 pun, lun,
1da177e4
LT		 916 NCR_700_phase[(dsps & 0xf00) >> 8]);
917 /* however, just ignore it */
918 }
919 break;
920
921 case A_PARITY_ERROR_MSG:
922 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
923 pun, lun);
924 NCR_700_internal_bus_reset(host);
925 break;
926 case A_SIMPLE_TAG_MSG:
927 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
928 pun, lun, hostdata->msgin[1],
929 NCR_700_phase[(dsps & 0xf00) >> 8]);
930 /* just ignore it */
931 break;
932 default:
933 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
934 host->host_no, pun, lun,
935 NCR_700_phase[(dsps & 0xf00) >> 8]);
936
1abfd370 937 spi_print_msg(hostdata->msgin);
1da177e4
LT		 938 printk("\n");
939 /* just reject it */
940 hostdata->msgout[0] = A_REJECT_MSG;
d3fa72e4
RB		 941 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
942 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
943 1);
1da177e4
LT		 944 /* SendMsgOut returns, so set up the return
945 * address */
946 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
947
948 break;
949 }
950 NCR_700_writel(temp, host, TEMP_REG);
951 /* set us up to receive another message */
d3fa72e4 952 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1da177e4
LT		 953 return resume_offset;
954}
955
956STATIC __u32
957process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
958 struct Scsi_Host *host,
959 struct NCR_700_Host_Parameters *hostdata)
960{
961 __u32 resume_offset = 0;
962 __u8 pun = 0xff, lun=0xff;
963
964 if(SCp != NULL) {
965 pun = SCp->device->id;
966 lun = SCp->device->lun;
967 }
968
969 if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
970 DEBUG((" COMMAND COMPLETE, status=%02x\n",
971 hostdata->status[0]));
972 /* OK, if TCQ still under negotiation, we now know it works */
973 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
974 NCR_700_set_tag_neg_state(SCp->device,
975 NCR_700_FINISHED_TAG_NEGOTIATION);
976
977 /* check for contingent allegiance contitions */
978 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
979 status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
980 struct NCR_700_command_slot *slot =
981 (struct NCR_700_command_slot *)SCp->host_scribble;
0f13fc09 982 if(slot->flags == NCR_700_FLAG_AUTOSENSE) {
1da177e4
LT		 983 /* OOPS: bad device, returning another
984 * contingent allegiance condition */
017560fc
JG		 985 scmd_printk(KERN_ERR, SCp,
986 "broken device is looping in contingent allegiance: ignoring\n");
1da177e4
LT		 987 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
988 } else {
0f13fc09
JB		 989 char *cmnd =
990 NCR_700_get_sense_cmnd(SCp->device);
1da177e4
LT		 991#ifdef NCR_DEBUG
992 scsi_print_command(SCp);
993 printk(" cmd %p has status %d, requesting sense\n",
994 SCp, hostdata->status[0]);
995#endif
996 /* we can destroy the command here
997 * because the contingent allegiance
998 * condition will cause a retry which
999 * will re-copy the command from the
1000 * saved data_cmnd. We also unmap any
1001 * data associated with the command
1002 * here */
1003 NCR_700_unmap(hostdata, SCp, slot);
67d59dfd 1004 dma_unmap_single(hostdata->dev, slot->pCmd,
64a87b24 1005 MAX_COMMAND_SIZE,
67d59dfd
JB		 1006 DMA_TO_DEVICE);
1007
0f13fc09
JB		 1008 cmnd[0] = REQUEST_SENSE;
1009 cmnd[1] = (SCp->device->lun & 0x7) << 5;
1010 cmnd[2] = 0;
1011 cmnd[3] = 0;
b80ca4f7 1012 cmnd[4] = SCSI_SENSE_BUFFERSIZE;
0f13fc09 1013 cmnd[5] = 0;
1da177e4
LT		 1014 /* Here's a quiet hack: the
1015 * REQUEST_SENSE command is six bytes,
1016 * so store a flag indicating that
1017 * this was an internal sense request
1018 * and the original status at the end
1019 * of the command */
0f13fc09
JB		 1020 cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1021 cmnd[7] = hostdata->status[0];
c603d04e
JB		 1022 cmnd[8] = SCp->cmd_len;
1023 SCp->cmd_len = 6; /* command length for
1024 * REQUEST_SENSE */
0f13fc09 1025 slot->pCmd = dma_map_single(hostdata->dev, cmnd, MAX_COMMAND_SIZE, DMA_TO_DEVICE);
b80ca4f7
FT		 1026 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1027 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | SCSI_SENSE_BUFFERSIZE);
1da177e4
LT		 1028 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1029 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1030 slot->SG[1].pAddr = 0;
1031 slot->resume_offset = hostdata->pScript;
d3fa72e4 1032 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
b80ca4f7 1033 dma_cache_sync(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
d3fa72e4 1034
1da177e4
LT		 1035 /* queue the command for reissue */
1036 slot->state = NCR_700_SLOT_QUEUED;
67d59dfd 1037 slot->flags = NCR_700_FLAG_AUTOSENSE;
1da177e4
LT		 1038 hostdata->state = NCR_700_HOST_FREE;
1039 hostdata->cmd = NULL;
1040 }
1041 } else {
1042 // Currently rely on the mid layer evaluation
1043 // of the tag queuing capability
1044 //
1045 //if(status_byte(hostdata->status[0]) == GOOD &&
1046 // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1047 // /* Piggy back the tag queueing support
1048 // * on this command */
1049 // dma_sync_single_for_cpu(hostdata->dev,
1050 // slot->dma_handle,
1051 // SCp->request_bufflen,
1052 // DMA_FROM_DEVICE);
1053 // if(((char *)SCp->request_buffer)[7] & 0x02) {
017560fc
JG		 1054 // scmd_printk(KERN_INFO, SCp,
1055 // "Enabling Tag Command Queuing\n");
1056 // hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1da177e4
LT		 1057 // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1058 // } else {
1059 // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
017560fc 1060 // hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1da177e4
LT		 1061 // }
1062 //}
1063 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1064 }
1065 } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1066 __u8 i = (dsps & 0xf00) >> 8;
1067
017560fc 1068 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1da177e4
LT		 1069 NCR_700_phase[i],
1070 sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
017560fc
JG		 1071 scmd_printk(KERN_ERR, SCp, " len = %d, cmd =",
1072 SCp->cmd_len);
1da177e4
LT		 1073 scsi_print_command(SCp);
1074
1075 NCR_700_internal_bus_reset(host);
1076 } else if((dsps & 0xfffff000) == A_FATAL) {
1077 int i = (dsps & 0xfff);
1078
1079 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1080 host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1081 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1082 printk(KERN_ERR " msg begins %02x %02x\n",
1083 hostdata->msgin[0], hostdata->msgin[1]);
1084 }
1085 NCR_700_internal_bus_reset(host);
1086 } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1087#ifdef NCR_700_DEBUG
1088 __u8 i = (dsps & 0xf00) >> 8;
1089
1090 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1091 host->host_no, pun, lun,
1092 i, NCR_700_phase[i]);
1093#endif
1094 save_for_reselection(hostdata, SCp, dsp);
1095
1096 } else if(dsps == A_RESELECTION_IDENTIFIED) {
1097 __u8 lun;
1098 struct NCR_700_command_slot *slot;
1099 __u8 reselection_id = hostdata->reselection_id;
1100 struct scsi_device *SDp;
1101
1102 lun = hostdata->msgin[0] & 0x1f;
1103
1104 hostdata->reselection_id = 0xff;
1105 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1106 host->host_no, reselection_id, lun));
1107 /* clear the reselection indicator */
1108 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1109 if(unlikely(SDp == NULL)) {
1110 printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1111 host->host_no, reselection_id, lun);
1112 BUG();
1113 }
1114 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1115 struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1116 if(unlikely(SCp == NULL)) {
1117 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1118 host->host_no, reselection_id, lun, hostdata->msgin[2]);
1119 BUG();
1120 }
1121
1122 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
017560fc
JG		 1123 DDEBUG(KERN_DEBUG, SDp,
1124 "reselection is tag %d, slot %p(%d)\n",
1125 hostdata->msgin[2], slot, slot->tag);
1da177e4
LT		 1126 } else {
1127 struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1128 if(unlikely(SCp == NULL)) {
017560fc
JG		 1129 sdev_printk(KERN_ERR, SDp,
1130 "no saved request for untagged cmd\n");
1da177e4
LT		 1131 BUG();
1132 }
1133 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1134 }
1135
1136 if(slot == NULL) {
1137 printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1138 host->host_no, reselection_id, lun,
1139 hostdata->msgin[0], hostdata->msgin[1],
1140 hostdata->msgin[2]);
1141 } else {
1142 if(hostdata->state != NCR_700_HOST_BUSY)
1143 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1144 host->host_no);
1145 resume_offset = slot->resume_offset;
1146 hostdata->cmd = slot->cmnd;
1147
1148 /* re-patch for this command */
d3fa72e4
RB		 1149 script_patch_32_abs(hostdata->dev, hostdata->script,
1150 CommandAddress, slot->pCmd);
1151 script_patch_16(hostdata->dev, hostdata->script,
1da177e4 1152 CommandCount, slot->cmnd->cmd_len);
d3fa72e4
RB		 1153 script_patch_32_abs(hostdata->dev, hostdata->script,
1154 SGScriptStartAddress,
1da177e4
LT		 1155 to32bit(&slot->pSG[0].ins));
1156
1157 /* Note: setting SXFER only works if we're
1158 * still in the MESSAGE phase, so it is vital
1159 * that ACK is still asserted when we process
1160 * the reselection message. The resume offset
1161 * should therefore always clear ACK */
1162 NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1163 host, SXFER_REG);
d3fa72e4 1164 dma_cache_sync(hostdata->dev, hostdata->msgin,
1da177e4 1165 MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
d3fa72e4 1166 dma_cache_sync(hostdata->dev, hostdata->msgout,
1da177e4
LT		 1167 MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1168 /* I'm just being paranoid here, the command should
1169 * already have been flushed from the cache */
d3fa72e4 1170 dma_cache_sync(hostdata->dev, slot->cmnd->cmnd,
1da177e4
LT		 1171 slot->cmnd->cmd_len, DMA_TO_DEVICE);
1172
1173
1174
1175 }
1176 } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1177
1178 /* This section is full of debugging code because I've
1179 * never managed to reach it. I think what happens is
1180 * that, because the 700 runs with selection
1181 * interrupts enabled the whole time that we take a
1182 * selection interrupt before we manage to get to the
1183 * reselected script interrupt */
1184
1185 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1186 struct NCR_700_command_slot *slot;
1187
1188 /* Take out our own ID */
1189 reselection_id &= ~(1<<host->this_id);
1190
1191 /* I've never seen this happen, so keep this as a printk rather
1192 * than a debug */
1193 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1194 host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1195
1196 {
1197 /* FIXME: DEBUGGING CODE */
1198 __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1199 int i;
1200
1201 for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1202 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1203 && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1204 break;
1205 }
1206 printk(KERN_INFO "IDENTIFIED SG segment as being %08x in slot %p, cmd %p, slot->resume_offset=%08x\n", SG, &hostdata->slots[i], hostdata->slots[i].cmnd, hostdata->slots[i].resume_offset);
1207 SCp = hostdata->slots[i].cmnd;
1208 }
1209
1210 if(SCp != NULL) {
1211 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1212 /* change slot from busy to queued to redo command */
1213 slot->state = NCR_700_SLOT_QUEUED;
1214 }
1215 hostdata->cmd = NULL;
1216
1217 if(reselection_id == 0) {
1218 if(hostdata->reselection_id == 0xff) {
1219 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1220 return 0;
1221 } else {
1222 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1223 host->host_no);
1224 reselection_id = hostdata->reselection_id;
1225 }
1226 } else {
1227
1228 /* convert to real ID */
1229 reselection_id = bitmap_to_number(reselection_id);
1230 }
1231 hostdata->reselection_id = reselection_id;
1232 /* just in case we have a stale simple tag message, clear it */
1233 hostdata->msgin[1] = 0;
d3fa72e4 1234 dma_cache_sync(hostdata->dev, hostdata->msgin,
1da177e4
LT		 1235 MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1236 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1237 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1238 } else {
1239 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1240 }
1241 } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1242 /* we've just disconnected from the bus, do nothing since
1243 * a return here will re-run the queued command slot
1244 * that may have been interrupted by the initial selection */
1245 DEBUG((" SELECTION COMPLETED\n"));
1246 } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1247 resume_offset = process_message(host, hostdata, SCp,
1248 dsp, dsps);
1249 } else if((dsps & 0xfffff000) == 0) {
1250 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1251 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1252 host->host_no, pun, lun, NCR_700_condition[i],
1253 NCR_700_phase[j], dsp - hostdata->pScript);
1254 if(SCp != NULL) {
3258a4d5 1255 struct scatterlist *sg;
1da177e4 1256
3258a4d5
FT		 1257 scsi_print_command(SCp);
1258 scsi_for_each_sg(SCp, sg, scsi_sg_count(SCp) + 1, i) {
1259 printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, sg->length, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].ins, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].pAddr);
1da177e4 1260 }
3258a4d5 1261 }
1da177e4
LT		 1262 NCR_700_internal_bus_reset(host);
1263 } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1264 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1265 host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1266 resume_offset = dsp;
1267 } else {
1268 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1269 host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1270 NCR_700_internal_bus_reset(host);
1271 }
1272 return resume_offset;
1273}
1274
1275/* We run the 53c700 with selection interrupts always enabled. This
1276 * means that the chip may be selected as soon as the bus frees. On a
1277 * busy bus, this can be before the scripts engine finishes its
1278 * processing. Therefore, part of the selection processing has to be
1279 * to find out what the scripts engine is doing and complete the
1280 * function if necessary (i.e. process the pending disconnect or save
1281 * the interrupted initial selection */
1282STATIC inline __u32
1283process_selection(struct Scsi_Host *host, __u32 dsp)
1284{
1285 __u8 id = 0; /* Squash compiler warning */
1286 int count = 0;
1287 __u32 resume_offset = 0;
1288 struct NCR_700_Host_Parameters *hostdata =
1289 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1290 struct scsi_cmnd *SCp = hostdata->cmd;
1291 __u8 sbcl;
1292
1293 for(count = 0; count < 5; count++) {
1294 id = NCR_700_readb(host, hostdata->chip710 ?
1295 CTEST9_REG : SFBR_REG);
1296
1297 /* Take out our own ID */
1298 id &= ~(1<<host->this_id);
1299 if(id != 0)
1300 break;
1301 udelay(5);
1302 }
1303 sbcl = NCR_700_readb(host, SBCL_REG);
1304 if((sbcl & SBCL_IO) == 0) {
1305 /* mark as having been selected rather than reselected */
1306 id = 0xff;
1307 } else {
1308 /* convert to real ID */
1309 hostdata->reselection_id = id = bitmap_to_number(id);
1310 DEBUG(("scsi%d: Reselected by %d\n",
1311 host->host_no, id));
1312 }
1313 if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1314 struct NCR_700_command_slot *slot =
1315 (struct NCR_700_command_slot *)SCp->host_scribble;
1316 DEBUG((" ID %d WARNING: RESELECTION OF BUSY HOST, saving cmd %p, slot %p, addr %x [%04x], resume %x!\n", id, hostdata->cmd, slot, dsp, dsp - hostdata->pScript, resume_offset));
1317
1318 switch(dsp - hostdata->pScript) {
1319 case Ent_Disconnect1:
1320 case Ent_Disconnect2:
1321 save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1322 break;
1323 case Ent_Disconnect3:
1324 case Ent_Disconnect4:
1325 save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1326 break;
1327 case Ent_Disconnect5:
1328 case Ent_Disconnect6:
1329 save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1330 break;
1331 case Ent_Disconnect7:
1332 case Ent_Disconnect8:
1333 save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1334 break;
1335 case Ent_Finish1:
1336 case Ent_Finish2:
1337 process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1338 break;
1339
1340 default:
1341 slot->state = NCR_700_SLOT_QUEUED;
1342 break;
1343 }
1344 }
1345 hostdata->state = NCR_700_HOST_BUSY;
1346 hostdata->cmd = NULL;
1347 /* clear any stale simple tag message */
1348 hostdata->msgin[1] = 0;
d3fa72e4 1349 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1da177e4
LT		 1350 DMA_BIDIRECTIONAL);
1351
1352 if(id == 0xff) {
1353 /* Selected as target, Ignore */
1354 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1355 } else if(hostdata->tag_negotiated & (1<<id)) {
1356 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1357 } else {
1358 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1359 }
1360 return resume_offset;
1361}
1362
1363static inline void
1364NCR_700_clear_fifo(struct Scsi_Host *host) {
1365 const struct NCR_700_Host_Parameters *hostdata
1366 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1367 if(hostdata->chip710) {
1368 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1369 } else {
1370 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1371 }
1372}
1373
1374static inline void
1375NCR_700_flush_fifo(struct Scsi_Host *host) {
1376 const struct NCR_700_Host_Parameters *hostdata
1377 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1378 if(hostdata->chip710) {
1379 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1380 udelay(10);
1381 NCR_700_writeb(0, host, CTEST8_REG);
1382 } else {
1383 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1384 udelay(10);
1385 NCR_700_writeb(0, host, DFIFO_REG);
1386 }
1387}
1388
1389
1390/* The queue lock with interrupts disabled must be held on entry to
1391 * this function */
1392STATIC int
1393NCR_700_start_command(struct scsi_cmnd *SCp)
1394{
1395 struct NCR_700_command_slot *slot =
1396 (struct NCR_700_command_slot *)SCp->host_scribble;
1397 struct NCR_700_Host_Parameters *hostdata =
1398 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1399 __u16 count = 1; /* for IDENTIFY message */
1400
1401 if(hostdata->state != NCR_700_HOST_FREE) {
1402 /* keep this inside the lock to close the race window where
1403 * the running command finishes on another CPU while we don't
1404 * change the state to queued on this one */
1405 slot->state = NCR_700_SLOT_QUEUED;
1406
1407 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1408 SCp->device->host->host_no, slot->cmnd, slot));
1409 return 0;
1410 }
1411 hostdata->state = NCR_700_HOST_BUSY;
1412 hostdata->cmd = SCp;
1413 slot->state = NCR_700_SLOT_BUSY;
1414 /* keep interrupts disabled until we have the command correctly
1415 * set up so we cannot take a selection interrupt */
1416
67d59dfd
JB		 1417 hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&
1418 slot->flags != NCR_700_FLAG_AUTOSENSE),
1da177e4
LT		 1419 SCp->device->lun);
1420 /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1421 * if the negotiated transfer parameters still hold, so
1422 * always renegotiate them */
67d59dfd
JB		 1423 if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||
1424 slot->flags == NCR_700_FLAG_AUTOSENSE) {
1da177e4
LT		 1425 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1426 }
1427
1428 /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1429 * If a contingent allegiance condition exists, the device
1430 * will refuse all tags, so send the request sense as untagged
1431 * */
422c0d61 1432 if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
67d59dfd
JB		 1433 && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&
1434 slot->flags != NCR_700_FLAG_AUTOSENSE)) {
1da177e4
LT		 1435 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
1436 }
1437
1438 if(hostdata->fast &&
1439 NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
6ea3c0b2
MW		 1440 count += spi_populate_sync_msg(&hostdata->msgout[count],
1441 spi_period(SCp->device->sdev_target),
1442 spi_offset(SCp->device->sdev_target));
1da177e4
LT		 1443 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1444 }
1445
d3fa72e4 1446 script_patch_16(hostdata->dev, hostdata->script, MessageCount, count);
1da177e4
LT		 1447
1448
d3fa72e4 1449 script_patch_ID(hostdata->dev, hostdata->script,
422c0d61 1450 Device_ID, 1<<scmd_id(SCp));
1da177e4 1451
d3fa72e4 1452 script_patch_32_abs(hostdata->dev, hostdata->script, CommandAddress,
1da177e4 1453 slot->pCmd);
d3fa72e4
RB		 1454 script_patch_16(hostdata->dev, hostdata->script, CommandCount,
1455 SCp->cmd_len);
1da177e4
LT		 1456 /* finally plumb the beginning of the SG list into the script
1457 * */
d3fa72e4
RB		 1458 script_patch_32_abs(hostdata->dev, hostdata->script,
1459 SGScriptStartAddress, to32bit(&slot->pSG[0].ins));
1da177e4
LT		 1460 NCR_700_clear_fifo(SCp->device->host);
1461
1462 if(slot->resume_offset == 0)
1463 slot->resume_offset = hostdata->pScript;
1464 /* now perform all the writebacks and invalidates */
d3fa72e4
RB		 1465 dma_cache_sync(hostdata->dev, hostdata->msgout, count, DMA_TO_DEVICE);
1466 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1da177e4 1467 DMA_FROM_DEVICE);
d3fa72e4
RB		 1468 dma_cache_sync(hostdata->dev, SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1469 dma_cache_sync(hostdata->dev, hostdata->status, 1, DMA_FROM_DEVICE);
1da177e4
LT		 1470
1471 /* set the synchronous period/offset */
1472 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1473 SCp->device->host, SXFER_REG);
1474 NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1475 NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1476
1477 return 1;
1478}
1479
1480irqreturn_t
7d12e780 1481NCR_700_intr(int irq, void *dev_id)
1da177e4
LT		 1482{
1483 struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1484 struct NCR_700_Host_Parameters *hostdata =
1485 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1486 __u8 istat;
1487 __u32 resume_offset = 0;
1488 __u8 pun = 0xff, lun = 0xff;
1489 unsigned long flags;
1490 int handled = 0;
1491
af901ca1 1492 /* Use the host lock to serialise access to the 53c700
1da177e4
LT		 1493 * hardware. Note: In future, we may need to take the queue
1494 * lock to enter the done routines. When that happens, we
1495 * need to ensure that for this driver, the host lock and the
1496 * queue lock point to the same thing. */
1497 spin_lock_irqsave(host->host_lock, flags);
1498 if((istat = NCR_700_readb(host, ISTAT_REG))
1499 & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1500 __u32 dsps;
1501 __u8 sstat0 = 0, dstat = 0;
1502 __u32 dsp;
1503 struct scsi_cmnd *SCp = hostdata->cmd;
1504 enum NCR_700_Host_State state;
1505
1506 handled = 1;
1507 state = hostdata->state;
1508 SCp = hostdata->cmd;
1509
1510 if(istat & SCSI_INT_PENDING) {
1511 udelay(10);
1512
1513 sstat0 = NCR_700_readb(host, SSTAT0_REG);
1514 }
1515
1516 if(istat & DMA_INT_PENDING) {
1517 udelay(10);
1518
1519 dstat = NCR_700_readb(host, DSTAT_REG);
1520 }
1521
1522 dsps = NCR_700_readl(host, DSPS_REG);
1523 dsp = NCR_700_readl(host, DSP_REG);
1524
1525 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1526 host->host_no, istat, sstat0, dstat,
1527 (dsp - (__u32)(hostdata->pScript))/4,
1528 dsp, dsps));
1529
1530 if(SCp != NULL) {
1531 pun = SCp->device->id;
1532 lun = SCp->device->lun;
1533 }
1534
1535 if(sstat0 & SCSI_RESET_DETECTED) {
1536 struct scsi_device *SDp;
1537 int i;
1538
1539 hostdata->state = NCR_700_HOST_BUSY;
1540
1541 printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1542 host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1543
1544 scsi_report_bus_reset(host, 0);
1545
1546 /* clear all the negotiated parameters */
1547 __shost_for_each_device(SDp, host)
0f13fc09 1548 NCR_700_clear_flag(SDp, ~0);
1da177e4
LT		 1549
1550 /* clear all the slots and their pending commands */
1551 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1552 struct scsi_cmnd *SCp;
1553 struct NCR_700_command_slot *slot =
1554 &hostdata->slots[i];
1555
1556 if(slot->state == NCR_700_SLOT_FREE)
1557 continue;
1558
1559 SCp = slot->cmnd;
1560 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1561 slot, SCp);
1562 free_slot(slot, hostdata);
1563 SCp->host_scribble = NULL;
1564 NCR_700_set_depth(SCp->device, 0);
1565 /* NOTE: deadlock potential here: we
1566 * rely on mid-layer guarantees that
1567 * scsi_done won't try to issue the
1568 * command again otherwise we'll
1569 * deadlock on the
1570 * hostdata->state_lock */
1571 SCp->result = DID_RESET << 16;
1572 SCp->scsi_done(SCp);
1573 }
1574 mdelay(25);
1575 NCR_700_chip_setup(host);
1576
1577 hostdata->state = NCR_700_HOST_FREE;
1578 hostdata->cmd = NULL;
1579 /* signal back if this was an eh induced reset */
1580 if(hostdata->eh_complete != NULL)
1581 complete(hostdata->eh_complete);
1582 goto out_unlock;
1583 } else if(sstat0 & SELECTION_TIMEOUT) {
1584 DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1585 host->host_no, pun, lun));
1586 NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1587 } else if(sstat0 & PHASE_MISMATCH) {
1588 struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1589 (struct NCR_700_command_slot *)SCp->host_scribble;
1590
1591 if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1592 /* It wants to reply to some part of
1593 * our message */
1594#ifdef NCR_700_DEBUG
1595 __u32 temp = NCR_700_readl(host, TEMP_REG);
1596 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1597 printk("scsi%d (%d:%d) PHASE MISMATCH IN SEND MESSAGE %d remain, return %p[%04x], phase %s\n", host->host_no, pun, lun, count, (void *)temp, temp - hostdata->pScript, sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1598#endif
1599 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1600 } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1601 dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1602 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1603 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1604 int residual = NCR_700_data_residual(host);
1605 int i;
1606#ifdef NCR_700_DEBUG
1607 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1608
1609 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1610 host->host_no, pun, lun,
1611 SGcount, data_transfer);
1612 scsi_print_command(SCp);
1613 if(residual) {
1614 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1615 host->host_no, pun, lun,
1616 SGcount, data_transfer, residual);
1617 }
1618#endif
1619 data_transfer += residual;
1620
1621 if(data_transfer != 0) {
1622 int count;
1623 __u32 pAddr;
1624
1625 SGcount--;
1626
1627 count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1628 DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1629 slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1630 slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1631 pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1632 pAddr += (count - data_transfer);
1633#ifdef NCR_700_DEBUG
1634 if(pAddr != naddr) {
1635 printk("scsi%d (%d:%d) transfer mismatch pAddr=%lx, naddr=%lx, data_transfer=%d, residual=%d\n", host->host_no, pun, lun, (unsigned long)pAddr, (unsigned long)naddr, data_transfer, residual);
1636 }
1637#endif
1638 slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1639 }
1640 /* set the executed moves to nops */
1641 for(i=0; i<SGcount; i++) {
1642 slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1643 slot->SG[i].pAddr = 0;
1644 }
d3fa72e4 1645 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1da177e4
LT		 1646 /* and pretend we disconnected after
1647 * the command phase */
1648 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1649 /* make sure all the data is flushed */
1650 NCR_700_flush_fifo(host);
1651 } else {
1652 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1653 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1654 host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1655 NCR_700_internal_bus_reset(host);
1656 }
1657
1658 } else if(sstat0 & SCSI_GROSS_ERROR) {
1659 printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1660 host->host_no, pun, lun);
1661 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1662 } else if(sstat0 & PARITY_ERROR) {
1663 printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1664 host->host_no, pun, lun);
1665 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1666 } else if(dstat & SCRIPT_INT_RECEIVED) {
1667 DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1668 host->host_no, pun, lun));
1669 resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1670 } else if(dstat & (ILGL_INST_DETECTED)) {
1671 printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1672 " Please email James.Bottomley@HansenPartnership.com with the details\n",
1673 host->host_no, pun, lun,
1674 dsp, dsp - hostdata->pScript);
1675 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1676 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1677 printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1678 host->host_no, pun, lun, dstat);
1679 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1680 }
1681
1682
1683 /* NOTE: selection interrupt processing MUST occur
1684 * after script interrupt processing to correctly cope
1685 * with the case where we process a disconnect and
1686 * then get reselected before we process the
1687 * disconnection */
1688 if(sstat0 & SELECTED) {
1689 /* FIXME: It currently takes at least FOUR
1690 * interrupts to complete a command that
1691 * disconnects: one for the disconnect, one
1692 * for the reselection, one to get the
1693 * reselection data and one to complete the
1694 * command. If we guess the reselected
1695 * command here and prepare it, we only need
1696 * to get a reselection data interrupt if we
1697 * guessed wrongly. Since the interrupt
1698 * overhead is much greater than the command
1699 * setup, this would be an efficient
1700 * optimisation particularly as we probably
1701 * only have one outstanding command on a
1702 * target most of the time */
1703
1704 resume_offset = process_selection(host, dsp);
1705
1706 }
1707
1708 }
1709
1710 if(resume_offset) {
1711 if(hostdata->state != NCR_700_HOST_BUSY) {
1712 printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1713 host->host_no, resume_offset, resume_offset - hostdata->pScript);
1714 hostdata->state = NCR_700_HOST_BUSY;
1715 }
1716
1717 DEBUG(("Attempting to resume at %x\n", resume_offset));
1718 NCR_700_clear_fifo(host);
1719 NCR_700_writel(resume_offset, host, DSP_REG);
1720 }
1721 /* There is probably a technical no-no about this: If we're a
1722 * shared interrupt and we got this interrupt because the
1723 * other device needs servicing not us, we're still going to
1724 * check our queued commands here---of course, there shouldn't
1725 * be any outstanding.... */
1726 if(hostdata->state == NCR_700_HOST_FREE) {
1727 int i;
1728
1729 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1730 /* fairness: always run the queue from the last
1731 * position we left off */
1732 int j = (i + hostdata->saved_slot_position)
1733 % NCR_700_COMMAND_SLOTS_PER_HOST;
1734
1735 if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1736 continue;
1737 if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1738 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1739 host->host_no, &hostdata->slots[j],
1740 hostdata->slots[j].cmnd));
1741 hostdata->saved_slot_position = j + 1;
1742 }
1743
1744 break;
1745 }
1746 }
1747 out_unlock:
1748 spin_unlock_irqrestore(host->host_lock, flags);
1749 return IRQ_RETVAL(handled);
1750}
1751
1752STATIC int
1753NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1754{
1755 struct NCR_700_Host_Parameters *hostdata =
1756 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1757 __u32 move_ins;
1758 enum dma_data_direction direction;
1759 struct NCR_700_command_slot *slot;
1760
1761 if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1762 /* We're over our allocation, this should never happen
1763 * since we report the max allocation to the mid layer */
1764 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1765 return 1;
1766 }
1767 /* check for untagged commands. We cannot have any outstanding
1768 * commands if we accept them. Commands could be untagged because:
1769 *
1770 * - The tag negotiated bitmap is clear
1771 * - The blk layer sent and untagged command
1772 */
1773 if(NCR_700_get_depth(SCp->device) != 0
017560fc 1774 && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1da177e4 1775 || !blk_rq_tagged(SCp->request))) {
017560fc
JG		 1776 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1777 NCR_700_get_depth(SCp->device));
1da177e4
LT		 1778 return SCSI_MLQUEUE_DEVICE_BUSY;
1779 }
1780 if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
017560fc
JG		 1781 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1782 NCR_700_get_depth(SCp->device));
1da177e4
LT		 1783 return SCSI_MLQUEUE_DEVICE_BUSY;
1784 }
1785 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1786
1787 /* begin the command here */
1788 /* no need to check for NULL, test for command_slot_count above
1789 * ensures a slot is free */
1790 slot = find_empty_slot(hostdata);
1791
1792 slot->cmnd = SCp;
1793
1794 SCp->scsi_done = done;
1795 SCp->host_scribble = (unsigned char *)slot;
1796 SCp->SCp.ptr = NULL;
1797 SCp->SCp.buffer = NULL;
1798
1799#ifdef NCR_700_DEBUG
1800 printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1801 scsi_print_command(SCp);
1802#endif
1803 if(blk_rq_tagged(SCp->request)
017560fc 1804 && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1da177e4 1805 && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
017560fc
JG		 1806 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1807 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1da177e4
LT		 1808 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1809 }
1810
1811 /* here we may have to process an untagged command. The gate
1812 * above ensures that this will be the only one outstanding,
1813 * so clear the tag negotiated bit.
1814 *
1815 * FIXME: This will royally screw up on multiple LUN devices
1816 * */
1817 if(!blk_rq_tagged(SCp->request)
017560fc
JG		 1818 && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1819 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1820 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1da177e4
LT		 1821 }
1822
017560fc 1823 if((hostdata->tag_negotiated &(1<<scmd_id(SCp)))
1da177e4
LT		 1824 && scsi_get_tag_type(SCp->device)) {
1825 slot->tag = SCp->request->tag;
017560fc
JG		 1826 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1827 slot->tag, slot);
1da177e4
LT		 1828 } else {
1829 slot->tag = SCSI_NO_TAG;
1830 /* must populate current_cmnd for scsi_find_tag to work */
1831 SCp->device->current_cmnd = SCp;
1832 }
1833 /* sanity check: some of the commands generated by the mid-layer
1834 * have an eccentric idea of their sc_data_direction */
3258a4d5
FT		 1835 if(!scsi_sg_count(SCp) && !scsi_bufflen(SCp) &&
1836 SCp->sc_data_direction != DMA_NONE) {
1da177e4
LT		 1837#ifdef NCR_700_DEBUG
1838 printk("53c700: Command");
1839 scsi_print_command(SCp);
1840 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1841#endif
1842 SCp->sc_data_direction = DMA_NONE;
1843 }
1844
1845 switch (SCp->cmnd[0]) {
1846 case REQUEST_SENSE:
1847 /* clear the internal sense magic */
1848 SCp->cmnd[6] = 0;
1849 /* fall through */
1850 default:
1851 /* OK, get it from the command */
1852 switch(SCp->sc_data_direction) {
1853 case DMA_BIDIRECTIONAL:
1854 default:
1855 printk(KERN_ERR "53c700: Unknown command for data direction ");
1856 scsi_print_command(SCp);
1857
1858 move_ins = 0;
1859 break;
1860 case DMA_NONE:
1861 move_ins = 0;
1862 break;
1863 case DMA_FROM_DEVICE:
1864 move_ins = SCRIPT_MOVE_DATA_IN;
1865 break;
1866 case DMA_TO_DEVICE:
1867 move_ins = SCRIPT_MOVE_DATA_OUT;
1868 break;
1869 }
1870 }
1871
1872 /* now build the scatter gather list */
1873 direction = SCp->sc_data_direction;
1874 if(move_ins != 0) {
1875 int i;
1876 int sg_count;
1877 dma_addr_t vPtr = 0;
3258a4d5 1878 struct scatterlist *sg;
1da177e4
LT		 1879 __u32 count = 0;
1880
3258a4d5
FT		 1881 sg_count = scsi_dma_map(SCp);
1882 BUG_ON(sg_count < 0);
1da177e4 1883
3258a4d5
FT		 1884 scsi_for_each_sg(SCp, sg, sg_count, i) {
1885 vPtr = sg_dma_address(sg);
1886 count = sg_dma_len(sg);
1da177e4
LT		 1887
1888 slot->SG[i].ins = bS_to_host(move_ins | count);
1889 DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1890 i, count, slot->SG[i].ins, (unsigned long)vPtr));
1891 slot->SG[i].pAddr = bS_to_host(vPtr);
1892 }
1893 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1894 slot->SG[i].pAddr = 0;
d3fa72e4 1895 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1da177e4 1896 DEBUG((" SETTING %08lx to %x\n",
d3fa72e4 1897 (&slot->pSG[i].ins),
1da177e4
LT		 1898 slot->SG[i].ins));
1899 }
1900 slot->resume_offset = 0;
1901 slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
64a87b24 1902 MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1da177e4
LT		 1903 NCR_700_start_command(SCp);
1904 return 0;
1905}
1906
1907STATIC int
1908NCR_700_abort(struct scsi_cmnd * SCp)
1909{
1910 struct NCR_700_command_slot *slot;
1911
017560fc
JG		 1912 scmd_printk(KERN_INFO, SCp,
1913 "New error handler wants to abort command\n\t");
1da177e4
LT		 1914 scsi_print_command(SCp);
1915
1916 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1917
1918 if(slot == NULL)
1919 /* no outstanding command to abort */
1920 return SUCCESS;
1921 if(SCp->cmnd[0] == TEST_UNIT_READY) {
1922 /* FIXME: This is because of a problem in the new
1923 * error handler. When it is in error recovery, it
1924 * will send a TUR to a device it thinks may still be
1925 * showing a problem. If the TUR isn't responded to,
1926 * it will abort it and mark the device off line.
1927 * Unfortunately, it does no other error recovery, so
1928 * this would leave us with an outstanding command
1929 * occupying a slot. Rather than allow this to
1930 * happen, we issue a bus reset to force all
1931 * outstanding commands to terminate here. */
1932 NCR_700_internal_bus_reset(SCp->device->host);
1933 /* still drop through and return failed */
1934 }
1935 return FAILED;
1936
1937}
1938
1939STATIC int
1940NCR_700_bus_reset(struct scsi_cmnd * SCp)
1941{
6e9a4738 1942 DECLARE_COMPLETION_ONSTACK(complete);
1da177e4
LT		 1943 struct NCR_700_Host_Parameters *hostdata =
1944 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1945
017560fc
JG		 1946 scmd_printk(KERN_INFO, SCp,
1947 "New error handler wants BUS reset, cmd %p\n\t", SCp);
1da177e4 1948 scsi_print_command(SCp);
68b3aa7c 1949
1da177e4
LT		 1950 /* In theory, eh_complete should always be null because the
1951 * eh is single threaded, but just in case we're handling a
1952 * reset via sg or something */
68b3aa7c
JG		 1953 spin_lock_irq(SCp->device->host->host_lock);
1954 while (hostdata->eh_complete != NULL) {
1da177e4
LT		 1955 spin_unlock_irq(SCp->device->host->host_lock);
1956 msleep_interruptible(100);
1957 spin_lock_irq(SCp->device->host->host_lock);
1958 }
68b3aa7c 1959
1da177e4
LT		 1960 hostdata->eh_complete = &complete;
1961 NCR_700_internal_bus_reset(SCp->device->host);
68b3aa7c 1962
1da177e4
LT		 1963 spin_unlock_irq(SCp->device->host->host_lock);
1964 wait_for_completion(&complete);
1965 spin_lock_irq(SCp->device->host->host_lock);
68b3aa7c 1966
1da177e4
LT		 1967 hostdata->eh_complete = NULL;
1968 /* Revalidate the transport parameters of the failing device */
1969 if(hostdata->fast)
1970 spi_schedule_dv_device(SCp->device);
68b3aa7c
JG		 1971
1972 spin_unlock_irq(SCp->device->host->host_lock);
1da177e4
LT		 1973 return SUCCESS;
1974}
1975
1da177e4
LT		 1976STATIC int
1977NCR_700_host_reset(struct scsi_cmnd * SCp)
1978{
017560fc 1979 scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset\n\t");
1da177e4
LT		 1980 scsi_print_command(SCp);
1981
df0ae249
JG		 1982 spin_lock_irq(SCp->device->host->host_lock);
1983
1da177e4
LT		 1984 NCR_700_internal_bus_reset(SCp->device->host);
1985 NCR_700_chip_reset(SCp->device->host);
df0ae249
JG		 1986
1987 spin_unlock_irq(SCp->device->host->host_lock);
1988
1da177e4
LT		 1989 return SUCCESS;
1990}
1991
1992STATIC void
1993NCR_700_set_period(struct scsi_target *STp, int period)
1994{
1995 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
1996 struct NCR_700_Host_Parameters *hostdata =
1997 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
1998
1999 if(!hostdata->fast)
2000 return;
2001
2002 if(period < hostdata->min_period)
2003 period = hostdata->min_period;
2004
2005 spi_period(STp) = period;
2006 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2007 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2008 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2009}
2010
2011STATIC void
2012NCR_700_set_offset(struct scsi_target *STp, int offset)
2013{
2014 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2015 struct NCR_700_Host_Parameters *hostdata =
2016 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2017 int max_offset = hostdata->chip710
2018 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2019
2020 if(!hostdata->fast)
2021 return;
2022
2023 if(offset > max_offset)
2024 offset = max_offset;
2025
2026 /* if we're currently async, make sure the period is reasonable */
2027 if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2028 spi_period(STp) > 0xff))
2029 spi_period(STp) = hostdata->min_period;
2030
2031 spi_offset(STp) = offset;
2032 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2033 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2034 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2035}
2036
0f13fc09
JB		 2037STATIC int
2038NCR_700_slave_alloc(struct scsi_device *SDp)
2039{
2040 SDp->hostdata = kzalloc(sizeof(struct NCR_700_Device_Parameters),
2041 GFP_KERNEL);
1da177e4 2042
0f13fc09
JB		 2043 if (!SDp->hostdata)
2044 return -ENOMEM;
2045
2046 return 0;
2047}
1da177e4
LT		 2048
2049STATIC int
2050NCR_700_slave_configure(struct scsi_device *SDp)
2051{
2052 struct NCR_700_Host_Parameters *hostdata =
2053 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2054
2055 /* to do here: allocate memory; build a queue_full list */
2056 if(SDp->tagged_supported) {
2057 scsi_set_tag_type(SDp, MSG_ORDERED_TAG);
2058 scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS);
2059 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2060 } else {
2061 /* initialise to default depth */
2062 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
2063 }
2064 if(hostdata->fast) {
2065 /* Find the correct offset and period via domain validation */
2066 if (!spi_initial_dv(SDp->sdev_target))
2067 spi_dv_device(SDp);
2068 } else {
2069 spi_offset(SDp->sdev_target) = 0;
2070 spi_period(SDp->sdev_target) = 0;
2071 }
2072 return 0;
2073}
2074
2075STATIC void
2076NCR_700_slave_destroy(struct scsi_device *SDp)
2077{
67d59dfd
JB		 2078 kfree(SDp->hostdata);
2079 SDp->hostdata = NULL;
1da177e4
LT		 2080}
2081
2082static int
e881a172 2083NCR_700_change_queue_depth(struct scsi_device *SDp, int depth, int reason)
1da177e4 2084{
e881a172
MC		 2085 if (reason != SCSI_QDEPTH_DEFAULT)
2086 return -EOPNOTSUPP;
2087
1da177e4
LT		 2088 if (depth > NCR_700_MAX_TAGS)
2089 depth = NCR_700_MAX_TAGS;
2090
2091 scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth);
2092 return depth;
2093}
2094
2095static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
2096{
2097 int change_tag = ((tag_type ==0 && scsi_get_tag_type(SDp) != 0)
2098 || (tag_type != 0 && scsi_get_tag_type(SDp) == 0));
2099 struct NCR_700_Host_Parameters *hostdata =
2100 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2101
2102 scsi_set_tag_type(SDp, tag_type);
2103
2104 /* We have a global (per target) flag to track whether TCQ is
2105 * enabled, so we'll be turning it off for the entire target here.
2106 * our tag algorithm will fail if we mix tagged and untagged commands,
2107 * so quiesce the device before doing this */
2108 if (change_tag)
2109 scsi_target_quiesce(SDp->sdev_target);
2110
2111 if (!tag_type) {
2112 /* shift back to the default unqueued number of commands
2113 * (the user can still raise this) */
2114 scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun);
422c0d61 2115 hostdata->tag_negotiated &= ~(1 << sdev_id(SDp));
1da177e4
LT		 2116 } else {
2117 /* Here, we cleared the negotiation flag above, so this
2118 * will force the driver to renegotiate */
2119 scsi_activate_tcq(SDp, SDp->queue_depth);
2120 if (change_tag)
2121 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2122 }
2123 if (change_tag)
2124 scsi_target_resume(SDp->sdev_target);
2125
2126 return tag_type;
2127}
2128
2129static ssize_t
10523b3b 2130NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
1da177e4
LT		 2131{
2132 struct scsi_device *SDp = to_scsi_device(dev);
2133
2134 return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2135}
2136
2137static struct device_attribute NCR_700_active_tags_attr = {
2138 .attr = {
2139 .name = "active_tags",
2140 .mode = S_IRUGO,
2141 },
2142 .show = NCR_700_show_active_tags,
2143};
2144
2145STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2146 &NCR_700_active_tags_attr,
2147 NULL,
2148};
2149
2150EXPORT_SYMBOL(NCR_700_detect);
2151EXPORT_SYMBOL(NCR_700_release);
2152EXPORT_SYMBOL(NCR_700_intr);
2153
2154static struct spi_function_template NCR_700_transport_functions = {
2155 .set_period = NCR_700_set_period,
2156 .show_period = 1,
2157 .set_offset = NCR_700_set_offset,
2158 .show_offset = 1,
2159};
2160
2161static int __init NCR_700_init(void)
2162{
2163 NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2164 if(!NCR_700_transport_template)
2165 return -ENODEV;
2166 return 0;
2167}
2168
2169static void __exit NCR_700_exit(void)
2170{
2171 spi_release_transport(NCR_700_transport_template);
2172}
2173
2174module_init(NCR_700_init);
2175module_exit(NCR_700_exit);
2176
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