[SCSI] lpfc 8.3.25: Adapter Interface fixes and changes
[linux-2.6.git] / drivers / scsi / 53c700.c
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
117 #include <linux/kernel.h>
118 #include <linux/types.h>
119 #include <linux/string.h>
120 #include <linux/slab.h>
121 #include <linux/ioport.h>
122 #include <linux/delay.h>
123 #include <linux/spinlock.h>
124 #include <linux/completion.h>
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>
130 #include <linux/device.h>
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
162 MODULE_AUTHOR("James Bottomley");
163 MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");
164 MODULE_LICENSE("GPL");
165
166 /* This is the script */
167 #include "53c700_d.h"
168
169
170 STATIC int NCR_700_queuecommand(struct Scsi_Host *h, struct scsi_cmnd *);
171 STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt);
172 STATIC int NCR_700_bus_reset(struct scsi_cmnd * SCpnt);
173 STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt);
174 STATIC void NCR_700_chip_setup(struct Scsi_Host *host);
175 STATIC void NCR_700_chip_reset(struct Scsi_Host *host);
176 STATIC int NCR_700_slave_alloc(struct scsi_device *SDpnt);
177 STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt);
178 STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt);
179 static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth, int reason);
180 static int NCR_700_change_queue_type(struct scsi_device *SDpnt, int depth);
181
182 STATIC struct device_attribute *NCR_700_dev_attrs[];
183
184 STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
185
186 static 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
197 static 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
212 static 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
219 static char *NCR_700_SBCL_bits[] = {
220         "IO ",
221         "CD ",
222         "MSG ",
223         "ATN ",
224         "SEL ",
225         "BSY ",
226         "ACK ",
227         "REQ ",
228 };
229
230 static 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
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 */
246 static inline __u8
247 NCR_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) {
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);
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) {
271                 XFERP =  min_xferp;
272         }
273         return (offset & 0x0f) | (XFERP & 0x07)<<4;
274 }
275
276 static inline __u8
277 NCR_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
287 struct Scsi_Host *
288 NCR_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;
312         hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
313         hostdata->dev = dev;
314
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;
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;
328         tpnt->slave_alloc = NCR_700_slave_alloc;
329         tpnt->change_queue_depth = NCR_700_change_queue_depth;
330         tpnt->change_queue_type = NCR_700_change_queue_type;
331
332         if(tpnt->name == NULL)
333                 tpnt->name = "53c700";
334         if(tpnt->proc_name == NULL)
335                 tpnt->proc_name = "53c700";
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);
342         for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
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
353         for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)
354                 script[j] = bS_to_host(SCRIPT[j]);
355
356         /* adjust all labels to be bus physical */
357         for (j = 0; j < PATCHES; j++)
358                 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
359         /* now patch up fixed addresses. */
360         script_patch_32(hostdata->dev, script, MessageLocation,
361                         pScript + MSGOUT_OFFSET);
362         script_patch_32(hostdata->dev, script, StatusAddress,
363                         pScript + STATUS_OFFSET);
364         script_patch_32(hostdata->dev, script, ReceiveMsgAddress,
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;
372         host->max_id = 8;
373         host->max_lun = NCR_700_MAX_LUNS;
374         BUG_ON(NCR_700_transport_template == NULL);
375         host->transportt = NCR_700_transport_template;
376         host->unique_id = (unsigned long)hostdata->base;
377         hostdata->eh_complete = NULL;
378         host->hostdata[0] = (unsigned long)hostdata;
379         /* kick the chip */
380         NCR_700_writeb(0xff, host, CTEST9_REG);
381         if (hostdata->chip710)
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);
386         if (banner == 0) {
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,
391                hostdata->chip710 ? "53c710" :
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
410 int
411 NCR_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
421 static inline __u8
422 NCR_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 */
439 static inline int
440 NCR_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 */
484 static inline char *
485 sbcl_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
499 static inline __u8
500 bitmap_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 */
510 STATIC struct NCR_700_command_slot *
511 find_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;
536         slot->flags = 0;
537         hostdata->command_slot_count++;
538         
539         return slot;
540 }
541
542 STATIC void 
543 free_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 */
564 STATIC void
565 save_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
579 STATIC inline void
580 NCR_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 &&
584            SCp->sc_data_direction != DMA_BIDIRECTIONAL)
585                 scsi_dma_unmap(SCp);
586 }
587
588 STATIC inline void
589 NCR_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                 
599                 dma_unmap_single(hostdata->dev, slot->pCmd,
600                                  MAX_COMMAND_SIZE, DMA_TO_DEVICE);
601                 if (slot->flags == NCR_700_FLAG_AUTOSENSE) {
602                         char *cmnd = NCR_700_get_sense_cmnd(SCp->device);
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
609                         dma_unmap_single(hostdata->dev, slot->dma_handle,
610                                          SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
611                         /* restore the old result if the request sense was
612                          * successful */
613                         if (result == 0)
614                                 result = cmnd[7];
615                         /* restore the original length */
616                         SCp->cmd_len = cmnd[8];
617                 } else
618                         NCR_700_unmap(hostdata, SCp, slot);
619
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
638 STATIC void
639 NCR_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
648 STATIC void
649 NCR_700_chip_setup(struct Scsi_Host *host)
650 {
651         struct NCR_700_Host_Parameters *hostdata = 
652                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
653         __u8 min_period;
654         __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
655
656         if(hostdata->chip710) {
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                 }
677                 hostdata->dcntl_extra |= COMPAT_700_MODE;
678
679                 NCR_700_writeb(hostdata->dcntl_extra, host, DCNTL_REG);
680                 NCR_700_writeb(burst_length | hostdata->dmode_extra,
681                                host, DMODE_710_REG);
682                 NCR_700_writeb(burst_disable | hostdata->ctest7_extra |
683                                (hostdata->differential ? DIFF : 0),
684                                host, CTEST7_REG);
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);
719                 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
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);
725                 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
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);
733                 NCR_700_writeb(ASYNC_DIV_2_0 | hostdata->dcntl_extra, host, DCNTL_REG);
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);
739                 NCR_700_writeb(ASYNC_DIV_1_5 | hostdata->dcntl_extra, host, DCNTL_REG);
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);
744                 NCR_700_writeb(ASYNC_DIV_1_0 | hostdata->dcntl_extra, host, DCNTL_REG);
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
758 STATIC void
759 NCR_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  * */
786 STATIC __u32
787 process_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 */
827                         shost_printk(KERN_WARNING, host,
828                                 "Unexpected SDTR msg\n");
829                         hostdata->msgout[0] = A_REJECT_MSG;
830                         dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
831                         script_patch_16(hostdata->dev, hostdata->script,
832                                         MessageCount, 1);
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;
843                 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
844                 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
845                                 1);
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]);
854                 spi_print_msg(hostdata->msgin);
855                 printk("\n");
856                 /* just reject it */
857                 hostdata->msgout[0] = A_REJECT_MSG;
858                 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
859                 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
860                                 1);
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
869 STATIC __u32
870 process_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]);
885         spi_print_msg(hostdata->msgin);
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 */
905                         scmd_printk(KERN_WARNING, SCp,
906                                 "Rejected first tag queue attempt, turning off tag queueing\n");
907                         /* we're done negotiating */
908                         NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
909                         hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
910                         SCp->device->tagged_supported = 0;
911                         scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
912                 } else {
913                         shost_printk(KERN_WARNING, host,
914                                 "(%d:%d) Unexpected REJECT Message %s\n",
915                                pun, lun,
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
937                 spi_print_msg(hostdata->msgin);
938                 printk("\n");
939                 /* just reject it */
940                 hostdata->msgout[0] = A_REJECT_MSG;
941                 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
942                 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
943                                 1);
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 */
952         dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
953         return resume_offset;
954 }
955
956 STATIC __u32
957 process_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;
982                         if(slot->flags == NCR_700_FLAG_AUTOSENSE) {
983                                 /* OOPS: bad device, returning another
984                                  * contingent allegiance condition */
985                                 scmd_printk(KERN_ERR, SCp,
986                                         "broken device is looping in contingent allegiance: ignoring\n");
987                                 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
988                         } else {
989                                 char *cmnd =
990                                         NCR_700_get_sense_cmnd(SCp->device);
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);
1004                                 dma_unmap_single(hostdata->dev, slot->pCmd,
1005                                                  MAX_COMMAND_SIZE,
1006                                                  DMA_TO_DEVICE);
1007
1008                                 cmnd[0] = REQUEST_SENSE;
1009                                 cmnd[1] = (SCp->device->lun & 0x7) << 5;
1010                                 cmnd[2] = 0;
1011                                 cmnd[3] = 0;
1012                                 cmnd[4] = SCSI_SENSE_BUFFERSIZE;
1013                                 cmnd[5] = 0;
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 */
1020                                 cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1021                                 cmnd[7] = hostdata->status[0];
1022                                 cmnd[8] = SCp->cmd_len;
1023                                 SCp->cmd_len = 6; /* command length for
1024                                                    * REQUEST_SENSE */
1025                                 slot->pCmd = dma_map_single(hostdata->dev, cmnd, MAX_COMMAND_SIZE, DMA_TO_DEVICE);
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);
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;
1032                                 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1033                                 dma_cache_sync(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1034
1035                                 /* queue the command for reissue */
1036                                 slot->state = NCR_700_SLOT_QUEUED;
1037                                 slot->flags = NCR_700_FLAG_AUTOSENSE;
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) {
1054                         //              scmd_printk(KERN_INFO, SCp,
1055                         //                   "Enabling Tag Command Queuing\n");
1056                         //              hostdata->tag_negotiated |= (1<<scmd_id(SCp));
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);
1060                         //              hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
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
1068                 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1069                        NCR_700_phase[i],
1070                        sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1071                 scmd_printk(KERN_ERR, SCp, "         len = %d, cmd =",
1072                         SCp->cmd_len);
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;
1123                         DDEBUG(KERN_DEBUG, SDp,
1124                                 "reselection is tag %d, slot %p(%d)\n",
1125                                 hostdata->msgin[2], slot, slot->tag);
1126                 } else {
1127                         struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1128                         if(unlikely(SCp == NULL)) {
1129                                 sdev_printk(KERN_ERR, SDp,
1130                                         "no saved request for untagged cmd\n");
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 */
1149                         script_patch_32_abs(hostdata->dev, hostdata->script,
1150                                             CommandAddress, slot->pCmd);
1151                         script_patch_16(hostdata->dev, hostdata->script,
1152                                         CommandCount, slot->cmnd->cmd_len);
1153                         script_patch_32_abs(hostdata->dev, hostdata->script,
1154                                             SGScriptStartAddress,
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);
1164                         dma_cache_sync(hostdata->dev, hostdata->msgin,
1165                                        MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1166                         dma_cache_sync(hostdata->dev, hostdata->msgout,
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 */
1170                         dma_cache_sync(hostdata->dev, slot->cmnd->cmnd,
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;
1234                 dma_cache_sync(hostdata->dev, hostdata->msgin,
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) {
1255                         struct scatterlist *sg;
1256
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);
1260                         }
1261                 }
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 */
1282 STATIC inline __u32
1283 process_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;
1349         dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
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
1363 static inline void
1364 NCR_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
1374 static inline void
1375 NCR_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 */
1392 STATIC int
1393 NCR_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
1417         hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&
1418                                                 slot->flags != NCR_700_FLAG_AUTOSENSE),
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 */
1423         if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||
1424            slot->flags == NCR_700_FLAG_AUTOSENSE) {
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          * */
1432         if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1433            && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&
1434                slot->flags != NCR_700_FLAG_AUTOSENSE)) {
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)) {
1440                 count += spi_populate_sync_msg(&hostdata->msgout[count],
1441                                 spi_period(SCp->device->sdev_target),
1442                                 spi_offset(SCp->device->sdev_target));
1443                 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1444         }
1445
1446         script_patch_16(hostdata->dev, hostdata->script, MessageCount, count);
1447
1448
1449         script_patch_ID(hostdata->dev, hostdata->script,
1450                         Device_ID, 1<<scmd_id(SCp));
1451
1452         script_patch_32_abs(hostdata->dev, hostdata->script, CommandAddress,
1453                             slot->pCmd);
1454         script_patch_16(hostdata->dev, hostdata->script, CommandCount,
1455                         SCp->cmd_len);
1456         /* finally plumb the beginning of the SG list into the script
1457          * */
1458         script_patch_32_abs(hostdata->dev, hostdata->script,
1459                             SGScriptStartAddress, to32bit(&slot->pSG[0].ins));
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 */
1465         dma_cache_sync(hostdata->dev, hostdata->msgout, count, DMA_TO_DEVICE);
1466         dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1467                        DMA_FROM_DEVICE);
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);
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
1480 irqreturn_t
1481 NCR_700_intr(int irq, void *dev_id)
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
1492         /* Use the host lock to serialise access to the 53c700
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)
1548                                 NCR_700_clear_flag(SDp, ~0);
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                                 }
1645                                 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
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
1752 static int
1753 NCR_700_queuecommand_lck(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
1774            && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1775                || !blk_rq_tagged(SCp->request))) {
1776                 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1777                        NCR_700_get_depth(SCp->device));
1778                 return SCSI_MLQUEUE_DEVICE_BUSY;
1779         }
1780         if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1781                 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1782                        NCR_700_get_depth(SCp->device));
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)
1804            && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1805            && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1806                 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1807                 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
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)
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));
1821         }
1822
1823         if((hostdata->tag_negotiated &(1<<scmd_id(SCp)))
1824            && scsi_get_tag_type(SCp->device)) {
1825                 slot->tag = SCp->request->tag;
1826                 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1827                        slot->tag, slot);
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 */
1835         if(!scsi_sg_count(SCp) && !scsi_bufflen(SCp) &&
1836            SCp->sc_data_direction != DMA_NONE) {
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;
1878                 struct scatterlist *sg;
1879                 __u32 count = 0;
1880
1881                 sg_count = scsi_dma_map(SCp);
1882                 BUG_ON(sg_count < 0);
1883
1884                 scsi_for_each_sg(SCp, sg, sg_count, i) {
1885                         vPtr = sg_dma_address(sg);
1886                         count = sg_dma_len(sg);
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;
1895                 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1896                 DEBUG((" SETTING %08lx to %x\n",
1897                        (&slot->pSG[i].ins),
1898                        slot->SG[i].ins));
1899         }
1900         slot->resume_offset = 0;
1901         slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1902                                     MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1903         NCR_700_start_command(SCp);
1904         return 0;
1905 }
1906
1907 STATIC DEF_SCSI_QCMD(NCR_700_queuecommand)
1908
1909 STATIC int
1910 NCR_700_abort(struct scsi_cmnd * SCp)
1911 {
1912         struct NCR_700_command_slot *slot;
1913
1914         scmd_printk(KERN_INFO, SCp,
1915                 "New error handler wants to abort command\n\t");
1916         scsi_print_command(SCp);
1917
1918         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1919
1920         if(slot == NULL)
1921                 /* no outstanding command to abort */
1922                 return SUCCESS;
1923         if(SCp->cmnd[0] == TEST_UNIT_READY) {
1924                 /* FIXME: This is because of a problem in the new
1925                  * error handler.  When it is in error recovery, it
1926                  * will send a TUR to a device it thinks may still be
1927                  * showing a problem.  If the TUR isn't responded to,
1928                  * it will abort it and mark the device off line.
1929                  * Unfortunately, it does no other error recovery, so
1930                  * this would leave us with an outstanding command
1931                  * occupying a slot.  Rather than allow this to
1932                  * happen, we issue a bus reset to force all
1933                  * outstanding commands to terminate here. */
1934                 NCR_700_internal_bus_reset(SCp->device->host);
1935                 /* still drop through and return failed */
1936         }
1937         return FAILED;
1938
1939 }
1940
1941 STATIC int
1942 NCR_700_bus_reset(struct scsi_cmnd * SCp)
1943 {
1944         DECLARE_COMPLETION_ONSTACK(complete);
1945         struct NCR_700_Host_Parameters *hostdata = 
1946                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1947
1948         scmd_printk(KERN_INFO, SCp,
1949                 "New error handler wants BUS reset, cmd %p\n\t", SCp);
1950         scsi_print_command(SCp);
1951
1952         /* In theory, eh_complete should always be null because the
1953          * eh is single threaded, but just in case we're handling a
1954          * reset via sg or something */
1955         spin_lock_irq(SCp->device->host->host_lock);
1956         while (hostdata->eh_complete != NULL) {
1957                 spin_unlock_irq(SCp->device->host->host_lock);
1958                 msleep_interruptible(100);
1959                 spin_lock_irq(SCp->device->host->host_lock);
1960         }
1961
1962         hostdata->eh_complete = &complete;
1963         NCR_700_internal_bus_reset(SCp->device->host);
1964
1965         spin_unlock_irq(SCp->device->host->host_lock);
1966         wait_for_completion(&complete);
1967         spin_lock_irq(SCp->device->host->host_lock);
1968
1969         hostdata->eh_complete = NULL;
1970         /* Revalidate the transport parameters of the failing device */
1971         if(hostdata->fast)
1972                 spi_schedule_dv_device(SCp->device);
1973
1974         spin_unlock_irq(SCp->device->host->host_lock);
1975         return SUCCESS;
1976 }
1977
1978 STATIC int
1979 NCR_700_host_reset(struct scsi_cmnd * SCp)
1980 {
1981         scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset\n\t");
1982         scsi_print_command(SCp);
1983
1984         spin_lock_irq(SCp->device->host->host_lock);
1985
1986         NCR_700_internal_bus_reset(SCp->device->host);
1987         NCR_700_chip_reset(SCp->device->host);
1988
1989         spin_unlock_irq(SCp->device->host->host_lock);
1990
1991         return SUCCESS;
1992 }
1993
1994 STATIC void
1995 NCR_700_set_period(struct scsi_target *STp, int period)
1996 {
1997         struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
1998         struct NCR_700_Host_Parameters *hostdata = 
1999                 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2000         
2001         if(!hostdata->fast)
2002                 return;
2003
2004         if(period < hostdata->min_period)
2005                 period = hostdata->min_period;
2006
2007         spi_period(STp) = period;
2008         spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2009                             NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2010         spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2011 }
2012
2013 STATIC void
2014 NCR_700_set_offset(struct scsi_target *STp, int offset)
2015 {
2016         struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2017         struct NCR_700_Host_Parameters *hostdata = 
2018                 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2019         int max_offset = hostdata->chip710
2020                 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2021         
2022         if(!hostdata->fast)
2023                 return;
2024
2025         if(offset > max_offset)
2026                 offset = max_offset;
2027
2028         /* if we're currently async, make sure the period is reasonable */
2029         if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2030                                     spi_period(STp) > 0xff))
2031                 spi_period(STp) = hostdata->min_period;
2032
2033         spi_offset(STp) = offset;
2034         spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2035                             NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2036         spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2037 }
2038
2039 STATIC int
2040 NCR_700_slave_alloc(struct scsi_device *SDp)
2041 {
2042         SDp->hostdata = kzalloc(sizeof(struct NCR_700_Device_Parameters),
2043                                 GFP_KERNEL);
2044
2045         if (!SDp->hostdata)
2046                 return -ENOMEM;
2047
2048         return 0;
2049 }
2050
2051 STATIC int
2052 NCR_700_slave_configure(struct scsi_device *SDp)
2053 {
2054         struct NCR_700_Host_Parameters *hostdata = 
2055                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2056
2057         /* to do here: allocate memory; build a queue_full list */
2058         if(SDp->tagged_supported) {
2059                 scsi_set_tag_type(SDp, MSG_ORDERED_TAG);
2060                 scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS);
2061                 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2062         } else {
2063                 /* initialise to default depth */
2064                 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
2065         }
2066         if(hostdata->fast) {
2067                 /* Find the correct offset and period via domain validation */
2068                 if (!spi_initial_dv(SDp->sdev_target))
2069                         spi_dv_device(SDp);
2070         } else {
2071                 spi_offset(SDp->sdev_target) = 0;
2072                 spi_period(SDp->sdev_target) = 0;
2073         }
2074         return 0;
2075 }
2076
2077 STATIC void
2078 NCR_700_slave_destroy(struct scsi_device *SDp)
2079 {
2080         kfree(SDp->hostdata);
2081         SDp->hostdata = NULL;
2082 }
2083
2084 static int
2085 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth, int reason)
2086 {
2087         if (reason != SCSI_QDEPTH_DEFAULT)
2088                 return -EOPNOTSUPP;
2089
2090         if (depth > NCR_700_MAX_TAGS)
2091                 depth = NCR_700_MAX_TAGS;
2092
2093         scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth);
2094         return depth;
2095 }
2096
2097 static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
2098 {
2099         int change_tag = ((tag_type ==0 &&  scsi_get_tag_type(SDp) != 0)
2100                           || (tag_type != 0 && scsi_get_tag_type(SDp) == 0));
2101         struct NCR_700_Host_Parameters *hostdata = 
2102                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2103
2104         scsi_set_tag_type(SDp, tag_type);
2105
2106         /* We have a global (per target) flag to track whether TCQ is
2107          * enabled, so we'll be turning it off for the entire target here.
2108          * our tag algorithm will fail if we mix tagged and untagged commands,
2109          * so quiesce the device before doing this */
2110         if (change_tag)
2111                 scsi_target_quiesce(SDp->sdev_target);
2112
2113         if (!tag_type) {
2114                 /* shift back to the default unqueued number of commands
2115                  * (the user can still raise this) */
2116                 scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun);
2117                 hostdata->tag_negotiated &= ~(1 << sdev_id(SDp));
2118         } else {
2119                 /* Here, we cleared the negotiation flag above, so this
2120                  * will force the driver to renegotiate */
2121                 scsi_activate_tcq(SDp, SDp->queue_depth);
2122                 if (change_tag)
2123                         NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2124         }
2125         if (change_tag)
2126                 scsi_target_resume(SDp->sdev_target);
2127
2128         return tag_type;
2129 }
2130
2131 static ssize_t
2132 NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
2133 {
2134         struct scsi_device *SDp = to_scsi_device(dev);
2135
2136         return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2137 }
2138
2139 static struct device_attribute NCR_700_active_tags_attr = {
2140         .attr = {
2141                 .name =         "active_tags",
2142                 .mode =         S_IRUGO,
2143         },
2144         .show = NCR_700_show_active_tags,
2145 };
2146
2147 STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2148         &NCR_700_active_tags_attr,
2149         NULL,
2150 };
2151
2152 EXPORT_SYMBOL(NCR_700_detect);
2153 EXPORT_SYMBOL(NCR_700_release);
2154 EXPORT_SYMBOL(NCR_700_intr);
2155
2156 static struct spi_function_template NCR_700_transport_functions =  {
2157         .set_period     = NCR_700_set_period,
2158         .show_period    = 1,
2159         .set_offset     = NCR_700_set_offset,
2160         .show_offset    = 1,
2161 };
2162
2163 static int __init NCR_700_init(void)
2164 {
2165         NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2166         if(!NCR_700_transport_template)
2167                 return -ENODEV;
2168         return 0;
2169 }
2170
2171 static void __exit NCR_700_exit(void)
2172 {
2173         spi_release_transport(NCR_700_transport_template);
2174 }
2175
2176 module_init(NCR_700_init);
2177 module_exit(NCR_700_exit);
2178