acee062cd6f66ccdf984c2623fc40dbc29281174
[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/ioport.h>
121 #include <linux/delay.h>
122 #include <linux/spinlock.h>
123 #include <linux/completion.h>
124 #include <linux/sched.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_cmnd *, void (*done)(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);
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                 printk(KERN_WARNING "53c700: XFERP %d is less than minium, setting to %d\n",
272                        XFERP,  min_xferp);
273                 XFERP =  min_xferp;
274         }
275         return (offset & 0x0f) | (XFERP & 0x07)<<4;
276 }
277
278 static inline __u8
279 NCR_700_get_SXFER(struct scsi_device *SDp)
280 {
281         struct NCR_700_Host_Parameters *hostdata = 
282                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
283
284         return NCR_700_offset_period_to_sxfer(hostdata,
285                                               spi_offset(SDp->sdev_target),
286                                               spi_period(SDp->sdev_target));
287 }
288
289 struct Scsi_Host *
290 NCR_700_detect(struct scsi_host_template *tpnt,
291                struct NCR_700_Host_Parameters *hostdata, struct device *dev)
292 {
293         dma_addr_t pScript, pSlots;
294         __u8 *memory;
295         __u32 *script;
296         struct Scsi_Host *host;
297         static int banner = 0;
298         int j;
299
300         if(tpnt->sdev_attrs == NULL)
301                 tpnt->sdev_attrs = NCR_700_dev_attrs;
302
303         memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
304                                        &pScript, GFP_KERNEL);
305         if(memory == NULL) {
306                 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
307                 return NULL;
308         }
309
310         script = (__u32 *)memory;
311         hostdata->msgin = memory + MSGIN_OFFSET;
312         hostdata->msgout = memory + MSGOUT_OFFSET;
313         hostdata->status = memory + STATUS_OFFSET;
314         /* all of these offsets are L1_CACHE_BYTES separated.  It is fatal
315          * if this isn't sufficient separation to avoid dma flushing issues */
316         BUG_ON(!dma_is_consistent(hostdata->dev, pScript) && L1_CACHE_BYTES < dma_get_cache_alignment());
317         hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
318         hostdata->dev = dev;
319
320         pSlots = pScript + SLOTS_OFFSET;
321
322         /* Fill in the missing routines from the host template */
323         tpnt->queuecommand = NCR_700_queuecommand;
324         tpnt->eh_abort_handler = NCR_700_abort;
325         tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
326         tpnt->eh_host_reset_handler = NCR_700_host_reset;
327         tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
328         tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
329         tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
330         tpnt->use_clustering = ENABLE_CLUSTERING;
331         tpnt->slave_configure = NCR_700_slave_configure;
332         tpnt->slave_destroy = NCR_700_slave_destroy;
333         tpnt->slave_alloc = NCR_700_slave_alloc;
334         tpnt->change_queue_depth = NCR_700_change_queue_depth;
335         tpnt->change_queue_type = NCR_700_change_queue_type;
336
337         if(tpnt->name == NULL)
338                 tpnt->name = "53c700";
339         if(tpnt->proc_name == NULL)
340                 tpnt->proc_name = "53c700";
341
342         host = scsi_host_alloc(tpnt, 4);
343         if (!host)
344                 return NULL;
345         memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
346                * NCR_700_COMMAND_SLOTS_PER_HOST);
347         for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
348                 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
349                                           - (unsigned long)&hostdata->slots[0].SG[0]);
350                 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
351                 if(j == 0)
352                         hostdata->free_list = &hostdata->slots[j];
353                 else
354                         hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
355                 hostdata->slots[j].state = NCR_700_SLOT_FREE;
356         }
357
358         for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)
359                 script[j] = bS_to_host(SCRIPT[j]);
360
361         /* adjust all labels to be bus physical */
362         for (j = 0; j < PATCHES; j++)
363                 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
364         /* now patch up fixed addresses. */
365         script_patch_32(script, MessageLocation,
366                         pScript + MSGOUT_OFFSET);
367         script_patch_32(script, StatusAddress,
368                         pScript + STATUS_OFFSET);
369         script_patch_32(script, ReceiveMsgAddress,
370                         pScript + MSGIN_OFFSET);
371
372         hostdata->script = script;
373         hostdata->pScript = pScript;
374         dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
375         hostdata->state = NCR_700_HOST_FREE;
376         hostdata->cmd = NULL;
377         host->max_id = 8;
378         host->max_lun = NCR_700_MAX_LUNS;
379         BUG_ON(NCR_700_transport_template == NULL);
380         host->transportt = NCR_700_transport_template;
381         host->unique_id = (unsigned long)hostdata->base;
382         hostdata->eh_complete = NULL;
383         host->hostdata[0] = (unsigned long)hostdata;
384         /* kick the chip */
385         NCR_700_writeb(0xff, host, CTEST9_REG);
386         if (hostdata->chip710)
387                 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
388         else
389                 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
390         hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
391         if (banner == 0) {
392                 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
393                 banner = 1;
394         }
395         printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
396                hostdata->chip710 ? "53c710" :
397                (hostdata->fast ? "53c700-66" : "53c700"),
398                hostdata->rev, hostdata->differential ?
399                "(Differential)" : "");
400         /* reset the chip */
401         NCR_700_chip_reset(host);
402
403         if (scsi_add_host(host, dev)) {
404                 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
405                 scsi_host_put(host);
406                 return NULL;
407         }
408
409         spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
410                 SPI_SIGNAL_SE;
411
412         return host;
413 }
414
415 int
416 NCR_700_release(struct Scsi_Host *host)
417 {
418         struct NCR_700_Host_Parameters *hostdata = 
419                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
420
421         dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
422                                hostdata->script, hostdata->pScript);
423         return 1;
424 }
425
426 static inline __u8
427 NCR_700_identify(int can_disconnect, __u8 lun)
428 {
429         return IDENTIFY_BASE |
430                 ((can_disconnect) ? 0x40 : 0) |
431                 (lun & NCR_700_LUN_MASK);
432 }
433
434 /*
435  * Function : static int data_residual (Scsi_Host *host)
436  *
437  * Purpose : return residual data count of what's in the chip.  If you
438  * really want to know what this function is doing, it's almost a
439  * direct transcription of the algorithm described in the 53c710
440  * guide, except that the DBC and DFIFO registers are only 6 bits
441  * wide on a 53c700.
442  *
443  * Inputs : host - SCSI host */
444 static inline int
445 NCR_700_data_residual (struct Scsi_Host *host) {
446         struct NCR_700_Host_Parameters *hostdata = 
447                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
448         int count, synchronous = 0;
449         unsigned int ddir;
450
451         if(hostdata->chip710) {
452                 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
453                          (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
454         } else {
455                 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
456                          (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
457         }
458         
459         if(hostdata->fast)
460                 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
461         
462         /* get the data direction */
463         ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
464
465         if (ddir) {
466                 /* Receive */
467                 if (synchronous) 
468                         count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
469                 else
470                         if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
471                                 ++count;
472         } else {
473                 /* Send */
474                 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
475                 if (sstat & SODL_REG_FULL)
476                         ++count;
477                 if (synchronous && (sstat & SODR_REG_FULL))
478                         ++count;
479         }
480 #ifdef NCR_700_DEBUG
481         if(count)
482                 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
483 #endif
484         return count;
485 }
486
487 /* print out the SCSI wires and corresponding phase from the SBCL register
488  * in the chip */
489 static inline char *
490 sbcl_to_string(__u8 sbcl)
491 {
492         int i;
493         static char ret[256];
494
495         ret[0]='\0';
496         for(i=0; i<8; i++) {
497                 if((1<<i) & sbcl) 
498                         strcat(ret, NCR_700_SBCL_bits[i]);
499         }
500         strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
501         return ret;
502 }
503
504 static inline __u8
505 bitmap_to_number(__u8 bitmap)
506 {
507         __u8 i;
508
509         for(i=0; i<8 && !(bitmap &(1<<i)); i++)
510                 ;
511         return i;
512 }
513
514 /* Pull a slot off the free list */
515 STATIC struct NCR_700_command_slot *
516 find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
517 {
518         struct NCR_700_command_slot *slot = hostdata->free_list;
519
520         if(slot == NULL) {
521                 /* sanity check */
522                 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
523                         printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
524                 return NULL;
525         }
526
527         if(slot->state != NCR_700_SLOT_FREE)
528                 /* should panic! */
529                 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
530                 
531
532         hostdata->free_list = slot->ITL_forw;
533         slot->ITL_forw = NULL;
534
535
536         /* NOTE: set the state to busy here, not queued, since this
537          * indicates the slot is in use and cannot be run by the IRQ
538          * finish routine.  If we cannot queue the command when it
539          * is properly build, we then change to NCR_700_SLOT_QUEUED */
540         slot->state = NCR_700_SLOT_BUSY;
541         slot->flags = 0;
542         hostdata->command_slot_count++;
543         
544         return slot;
545 }
546
547 STATIC void 
548 free_slot(struct NCR_700_command_slot *slot,
549           struct NCR_700_Host_Parameters *hostdata)
550 {
551         if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
552                 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
553         }
554         if(slot->state == NCR_700_SLOT_FREE) {
555                 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
556         }
557         
558         slot->resume_offset = 0;
559         slot->cmnd = NULL;
560         slot->state = NCR_700_SLOT_FREE;
561         slot->ITL_forw = hostdata->free_list;
562         hostdata->free_list = slot;
563         hostdata->command_slot_count--;
564 }
565
566
567 /* This routine really does very little.  The command is indexed on
568    the ITL and (if tagged) the ITLQ lists in _queuecommand */
569 STATIC void
570 save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
571                      struct scsi_cmnd *SCp, __u32 dsp)
572 {
573         /* Its just possible that this gets executed twice */
574         if(SCp != NULL) {
575                 struct NCR_700_command_slot *slot =
576                         (struct NCR_700_command_slot *)SCp->host_scribble;
577
578                 slot->resume_offset = dsp;
579         }
580         hostdata->state = NCR_700_HOST_FREE;
581         hostdata->cmd = NULL;
582 }
583
584 STATIC inline void
585 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
586               struct NCR_700_command_slot *slot)
587 {
588         if(SCp->sc_data_direction != DMA_NONE &&
589            SCp->sc_data_direction != DMA_BIDIRECTIONAL) {
590                 if(SCp->use_sg) {
591                         dma_unmap_sg(hostdata->dev, SCp->request_buffer,
592                                      SCp->use_sg, SCp->sc_data_direction);
593                 } else {
594                         dma_unmap_single(hostdata->dev, slot->dma_handle,
595                                          SCp->request_bufflen,
596                                          SCp->sc_data_direction);
597                 }
598         }
599 }
600
601 STATIC inline void
602 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
603                struct scsi_cmnd *SCp, int result)
604 {
605         hostdata->state = NCR_700_HOST_FREE;
606         hostdata->cmd = NULL;
607
608         if(SCp != NULL) {
609                 struct NCR_700_command_slot *slot = 
610                         (struct NCR_700_command_slot *)SCp->host_scribble;
611                 
612                 dma_unmap_single(hostdata->dev, slot->pCmd,
613                                  sizeof(SCp->cmnd), DMA_TO_DEVICE);
614                 if (slot->flags == NCR_700_FLAG_AUTOSENSE) {
615                         char *cmnd = NCR_700_get_sense_cmnd(SCp->device);
616 #ifdef NCR_700_DEBUG
617                         printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
618                                SCp, SCp->cmnd[7], result);
619                         scsi_print_sense("53c700", SCp);
620
621 #endif
622                         dma_unmap_single(hostdata->dev, slot->dma_handle, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
623                         /* restore the old result if the request sense was
624                          * successful */
625                         if (result == 0)
626                                 result = cmnd[7];
627                         /* restore the original length */
628                         SCp->cmd_len = cmnd[8];
629                 } else
630                         NCR_700_unmap(hostdata, SCp, slot);
631
632                 free_slot(slot, hostdata);
633 #ifdef NCR_700_DEBUG
634                 if(NCR_700_get_depth(SCp->device) == 0 ||
635                    NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
636                         printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
637                                NCR_700_get_depth(SCp->device));
638 #endif /* NCR_700_DEBUG */
639                 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
640
641                 SCp->host_scribble = NULL;
642                 SCp->result = result;
643                 SCp->scsi_done(SCp);
644         } else {
645                 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
646         }
647 }
648
649
650 STATIC void
651 NCR_700_internal_bus_reset(struct Scsi_Host *host)
652 {
653         /* Bus reset */
654         NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
655         udelay(50);
656         NCR_700_writeb(0, host, SCNTL1_REG);
657
658 }
659
660 STATIC void
661 NCR_700_chip_setup(struct Scsi_Host *host)
662 {
663         struct NCR_700_Host_Parameters *hostdata = 
664                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
665         __u32 dcntl_extra = 0;
666         __u8 min_period;
667         __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
668
669         if(hostdata->chip710) {
670                 __u8 burst_disable = hostdata->burst_disable
671                         ? BURST_DISABLE : 0;
672                 dcntl_extra = COMPAT_700_MODE;
673
674                 NCR_700_writeb(dcntl_extra, host, DCNTL_REG);
675                 NCR_700_writeb(BURST_LENGTH_8  | hostdata->dmode_extra,
676                                host, DMODE_710_REG);
677                 NCR_700_writeb(burst_disable | (hostdata->differential ? 
678                                                 DIFF : 0), host, CTEST7_REG);
679                 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
680                 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
681                                | AUTO_ATN, host, SCNTL0_REG);
682         } else {
683                 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
684                                host, DMODE_700_REG);
685                 NCR_700_writeb(hostdata->differential ? 
686                                DIFF : 0, host, CTEST7_REG);
687                 if(hostdata->fast) {
688                         /* this is for 700-66, does nothing on 700 */
689                         NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION 
690                                        | GENERATE_RECEIVE_PARITY, host,
691                                        CTEST8_REG);
692                 } else {
693                         NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
694                                        | PARITY | AUTO_ATN, host, SCNTL0_REG);
695                 }
696         }
697
698         NCR_700_writeb(1 << host->this_id, host, SCID_REG);
699         NCR_700_writeb(0, host, SBCL_REG);
700         NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
701
702         NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
703              | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
704
705         NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
706         NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
707         if(hostdata->clock > 75) {
708                 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
709                 /* do the best we can, but the async clock will be out
710                  * of spec: sync divider 2, async divider 3 */
711                 DEBUG(("53c700: sync 2 async 3\n"));
712                 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
713                 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
714                 hostdata->sync_clock = hostdata->clock/2;
715         } else  if(hostdata->clock > 50  && hostdata->clock <= 75) {
716                 /* sync divider 1.5, async divider 3 */
717                 DEBUG(("53c700: sync 1.5 async 3\n"));
718                 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
719                 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
720                 hostdata->sync_clock = hostdata->clock*2;
721                 hostdata->sync_clock /= 3;
722                 
723         } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
724                 /* sync divider 1, async divider 2 */
725                 DEBUG(("53c700: sync 1 async 2\n"));
726                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
727                 NCR_700_writeb(ASYNC_DIV_2_0 | dcntl_extra, host, DCNTL_REG);
728                 hostdata->sync_clock = hostdata->clock;
729         } else if(hostdata->clock > 25 && hostdata->clock <=37) {
730                 /* sync divider 1, async divider 1.5 */
731                 DEBUG(("53c700: sync 1 async 1.5\n"));
732                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
733                 NCR_700_writeb(ASYNC_DIV_1_5 | dcntl_extra, host, DCNTL_REG);
734                 hostdata->sync_clock = hostdata->clock;
735         } else {
736                 DEBUG(("53c700: sync 1 async 1\n"));
737                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
738                 NCR_700_writeb(ASYNC_DIV_1_0 | dcntl_extra, host, DCNTL_REG);
739                 /* sync divider 1, async divider 1 */
740                 hostdata->sync_clock = hostdata->clock;
741         }
742         /* Calculate the actual minimum period that can be supported
743          * by our synchronous clock speed.  See the 710 manual for
744          * exact details of this calculation which is based on a
745          * setting of the SXFER register */
746         min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
747         hostdata->min_period = NCR_700_MIN_PERIOD;
748         if(min_period > NCR_700_MIN_PERIOD)
749                 hostdata->min_period = min_period;
750 }
751
752 STATIC void
753 NCR_700_chip_reset(struct Scsi_Host *host)
754 {
755         struct NCR_700_Host_Parameters *hostdata = 
756                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
757         if(hostdata->chip710) {
758                 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
759                 udelay(100);
760
761                 NCR_700_writeb(0, host, ISTAT_REG);
762         } else {
763                 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
764                 udelay(100);
765                 
766                 NCR_700_writeb(0, host, DCNTL_REG);
767         }
768
769         mdelay(1000);
770
771         NCR_700_chip_setup(host);
772 }
773
774 /* The heart of the message processing engine is that the instruction
775  * immediately after the INT is the normal case (and so must be CLEAR
776  * ACK).  If we want to do something else, we call that routine in
777  * scripts and set temp to be the normal case + 8 (skipping the CLEAR
778  * ACK) so that the routine returns correctly to resume its activity
779  * */
780 STATIC __u32
781 process_extended_message(struct Scsi_Host *host, 
782                          struct NCR_700_Host_Parameters *hostdata,
783                          struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
784 {
785         __u32 resume_offset = dsp, temp = dsp + 8;
786         __u8 pun = 0xff, lun = 0xff;
787
788         if(SCp != NULL) {
789                 pun = SCp->device->id;
790                 lun = SCp->device->lun;
791         }
792
793         switch(hostdata->msgin[2]) {
794         case A_SDTR_MSG:
795                 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
796                         struct scsi_target *starget = SCp->device->sdev_target;
797                         __u8 period = hostdata->msgin[3];
798                         __u8 offset = hostdata->msgin[4];
799
800                         if(offset == 0 || period == 0) {
801                                 offset = 0;
802                                 period = 0;
803                         }
804
805                         spi_offset(starget) = offset;
806                         spi_period(starget) = period;
807                         
808                         if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
809                                 spi_display_xfer_agreement(starget);
810                                 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
811                         }
812                         
813                         NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
814                         NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
815                         
816                         NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
817                                        host, SXFER_REG);
818
819                 } else {
820                         /* SDTR message out of the blue, reject it */
821                         shost_printk(KERN_WARNING, host,
822                                 "Unexpected SDTR msg\n");
823                         hostdata->msgout[0] = A_REJECT_MSG;
824                         dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
825                         script_patch_16(hostdata->script, MessageCount, 1);
826                         /* SendMsgOut returns, so set up the return
827                          * address */
828                         resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
829                 }
830                 break;
831         
832         case A_WDTR_MSG:
833                 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
834                        host->host_no, pun, lun);
835                 hostdata->msgout[0] = A_REJECT_MSG;
836                 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
837                 script_patch_16(hostdata->script, MessageCount, 1);
838                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
839
840                 break;
841
842         default:
843                 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
844                        host->host_no, pun, lun,
845                        NCR_700_phase[(dsps & 0xf00) >> 8]);
846                 spi_print_msg(hostdata->msgin);
847                 printk("\n");
848                 /* just reject it */
849                 hostdata->msgout[0] = A_REJECT_MSG;
850                 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
851                 script_patch_16(hostdata->script, MessageCount, 1);
852                 /* SendMsgOut returns, so set up the return
853                  * address */
854                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
855         }
856         NCR_700_writel(temp, host, TEMP_REG);
857         return resume_offset;
858 }
859
860 STATIC __u32
861 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
862                 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
863 {
864         /* work out where to return to */
865         __u32 temp = dsp + 8, resume_offset = dsp;
866         __u8 pun = 0xff, lun = 0xff;
867
868         if(SCp != NULL) {
869                 pun = SCp->device->id;
870                 lun = SCp->device->lun;
871         }
872
873 #ifdef NCR_700_DEBUG
874         printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
875                NCR_700_phase[(dsps & 0xf00) >> 8]);
876         spi_print_msg(hostdata->msgin);
877         printk("\n");
878 #endif
879
880         switch(hostdata->msgin[0]) {
881
882         case A_EXTENDED_MSG:
883                 resume_offset =  process_extended_message(host, hostdata, SCp,
884                                                           dsp, dsps);
885                 break;
886
887         case A_REJECT_MSG:
888                 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
889                         /* Rejected our sync negotiation attempt */
890                         spi_period(SCp->device->sdev_target) =
891                                 spi_offset(SCp->device->sdev_target) = 0;
892                         NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
893                         NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
894                 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
895                         /* rejected our first simple tag message */
896                         scmd_printk(KERN_WARNING, SCp,
897                                 "Rejected first tag queue attempt, turning off tag queueing\n");
898                         /* we're done negotiating */
899                         NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
900                         hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
901                         SCp->device->tagged_supported = 0;
902                         scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
903                 } else {
904                         shost_printk(KERN_WARNING, host,
905                                 "(%d:%d) Unexpected REJECT Message %s\n",
906                                pun, lun,
907                                NCR_700_phase[(dsps & 0xf00) >> 8]);
908                         /* however, just ignore it */
909                 }
910                 break;
911
912         case A_PARITY_ERROR_MSG:
913                 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
914                        pun, lun);
915                 NCR_700_internal_bus_reset(host);
916                 break;
917         case A_SIMPLE_TAG_MSG:
918                 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
919                        pun, lun, hostdata->msgin[1],
920                        NCR_700_phase[(dsps & 0xf00) >> 8]);
921                 /* just ignore it */
922                 break;
923         default:
924                 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
925                        host->host_no, pun, lun,
926                        NCR_700_phase[(dsps & 0xf00) >> 8]);
927
928                 spi_print_msg(hostdata->msgin);
929                 printk("\n");
930                 /* just reject it */
931                 hostdata->msgout[0] = A_REJECT_MSG;
932                 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
933                 script_patch_16(hostdata->script, MessageCount, 1);
934                 /* SendMsgOut returns, so set up the return
935                  * address */
936                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
937
938                 break;
939         }
940         NCR_700_writel(temp, host, TEMP_REG);
941         /* set us up to receive another message */
942         dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
943         return resume_offset;
944 }
945
946 STATIC __u32
947 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
948                          struct Scsi_Host *host,
949                          struct NCR_700_Host_Parameters *hostdata)
950 {
951         __u32 resume_offset = 0;
952         __u8 pun = 0xff, lun=0xff;
953
954         if(SCp != NULL) {
955                 pun = SCp->device->id;
956                 lun = SCp->device->lun;
957         }
958
959         if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
960                 DEBUG(("  COMMAND COMPLETE, status=%02x\n",
961                        hostdata->status[0]));
962                 /* OK, if TCQ still under negotiation, we now know it works */
963                 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
964                         NCR_700_set_tag_neg_state(SCp->device,
965                                                   NCR_700_FINISHED_TAG_NEGOTIATION);
966                         
967                 /* check for contingent allegiance contitions */
968                 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
969                    status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
970                         struct NCR_700_command_slot *slot =
971                                 (struct NCR_700_command_slot *)SCp->host_scribble;
972                         if(slot->flags == NCR_700_FLAG_AUTOSENSE) {
973                                 /* OOPS: bad device, returning another
974                                  * contingent allegiance condition */
975                                 scmd_printk(KERN_ERR, SCp,
976                                         "broken device is looping in contingent allegiance: ignoring\n");
977                                 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
978                         } else {
979                                 char *cmnd =
980                                         NCR_700_get_sense_cmnd(SCp->device);
981 #ifdef NCR_DEBUG
982                                 scsi_print_command(SCp);
983                                 printk("  cmd %p has status %d, requesting sense\n",
984                                        SCp, hostdata->status[0]);
985 #endif
986                                 /* we can destroy the command here
987                                  * because the contingent allegiance
988                                  * condition will cause a retry which
989                                  * will re-copy the command from the
990                                  * saved data_cmnd.  We also unmap any
991                                  * data associated with the command
992                                  * here */
993                                 NCR_700_unmap(hostdata, SCp, slot);
994                                 dma_unmap_single(hostdata->dev, slot->pCmd,
995                                                  sizeof(SCp->cmnd),
996                                                  DMA_TO_DEVICE);
997
998                                 cmnd[0] = REQUEST_SENSE;
999                                 cmnd[1] = (SCp->device->lun & 0x7) << 5;
1000                                 cmnd[2] = 0;
1001                                 cmnd[3] = 0;
1002                                 cmnd[4] = sizeof(SCp->sense_buffer);
1003                                 cmnd[5] = 0;
1004                                 /* Here's a quiet hack: the
1005                                  * REQUEST_SENSE command is six bytes,
1006                                  * so store a flag indicating that
1007                                  * this was an internal sense request
1008                                  * and the original status at the end
1009                                  * of the command */
1010                                 cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1011                                 cmnd[7] = hostdata->status[0];
1012                                 cmnd[8] = SCp->cmd_len;
1013                                 SCp->cmd_len = 6; /* command length for
1014                                                    * REQUEST_SENSE */
1015                                 slot->pCmd = dma_map_single(hostdata->dev, cmnd, MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1016                                 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1017                                 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | sizeof(SCp->sense_buffer));
1018                                 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1019                                 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1020                                 slot->SG[1].pAddr = 0;
1021                                 slot->resume_offset = hostdata->pScript;
1022                                 dma_cache_sync(slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1023                                 dma_cache_sync(SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1024                                 
1025                                 /* queue the command for reissue */
1026                                 slot->state = NCR_700_SLOT_QUEUED;
1027                                 slot->flags = NCR_700_FLAG_AUTOSENSE;
1028                                 hostdata->state = NCR_700_HOST_FREE;
1029                                 hostdata->cmd = NULL;
1030                         }
1031                 } else {
1032                         // Currently rely on the mid layer evaluation
1033                         // of the tag queuing capability
1034                         //
1035                         //if(status_byte(hostdata->status[0]) == GOOD &&
1036                         //   SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1037                         //      /* Piggy back the tag queueing support
1038                         //       * on this command */
1039                         //      dma_sync_single_for_cpu(hostdata->dev,
1040                         //                          slot->dma_handle,
1041                         //                          SCp->request_bufflen,
1042                         //                          DMA_FROM_DEVICE);
1043                         //      if(((char *)SCp->request_buffer)[7] & 0x02) {
1044                         //              scmd_printk(KERN_INFO, SCp,
1045                         //                   "Enabling Tag Command Queuing\n");
1046                         //              hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1047                         //              NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1048                         //      } else {
1049                         //              NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1050                         //              hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1051                         //      }
1052                         //}
1053                         NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1054                 }
1055         } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1056                 __u8 i = (dsps & 0xf00) >> 8;
1057
1058                 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1059                        NCR_700_phase[i],
1060                        sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1061                 scmd_printk(KERN_ERR, SCp, "         len = %d, cmd =",
1062                         SCp->cmd_len);
1063                 scsi_print_command(SCp);
1064
1065                 NCR_700_internal_bus_reset(host);
1066         } else if((dsps & 0xfffff000) == A_FATAL) {
1067                 int i = (dsps & 0xfff);
1068
1069                 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1070                        host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1071                 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1072                         printk(KERN_ERR "     msg begins %02x %02x\n",
1073                                hostdata->msgin[0], hostdata->msgin[1]);
1074                 }
1075                 NCR_700_internal_bus_reset(host);
1076         } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1077 #ifdef NCR_700_DEBUG
1078                 __u8 i = (dsps & 0xf00) >> 8;
1079
1080                 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1081                        host->host_no, pun, lun,
1082                        i, NCR_700_phase[i]);
1083 #endif
1084                 save_for_reselection(hostdata, SCp, dsp);
1085
1086         } else if(dsps == A_RESELECTION_IDENTIFIED) {
1087                 __u8 lun;
1088                 struct NCR_700_command_slot *slot;
1089                 __u8 reselection_id = hostdata->reselection_id;
1090                 struct scsi_device *SDp;
1091
1092                 lun = hostdata->msgin[0] & 0x1f;
1093
1094                 hostdata->reselection_id = 0xff;
1095                 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1096                        host->host_no, reselection_id, lun));
1097                 /* clear the reselection indicator */
1098                 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1099                 if(unlikely(SDp == NULL)) {
1100                         printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1101                                host->host_no, reselection_id, lun);
1102                         BUG();
1103                 }
1104                 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1105                         struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1106                         if(unlikely(SCp == NULL)) {
1107                                 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n", 
1108                                        host->host_no, reselection_id, lun, hostdata->msgin[2]);
1109                                 BUG();
1110                         }
1111
1112                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1113                         DDEBUG(KERN_DEBUG, SDp,
1114                                 "reselection is tag %d, slot %p(%d)\n",
1115                                 hostdata->msgin[2], slot, slot->tag);
1116                 } else {
1117                         struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1118                         if(unlikely(SCp == NULL)) {
1119                                 sdev_printk(KERN_ERR, SDp,
1120                                         "no saved request for untagged cmd\n");
1121                                 BUG();
1122                         }
1123                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1124                 }
1125
1126                 if(slot == NULL) {
1127                         printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1128                                host->host_no, reselection_id, lun,
1129                                hostdata->msgin[0], hostdata->msgin[1],
1130                                hostdata->msgin[2]);
1131                 } else {
1132                         if(hostdata->state != NCR_700_HOST_BUSY)
1133                                 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1134                                        host->host_no);
1135                         resume_offset = slot->resume_offset;
1136                         hostdata->cmd = slot->cmnd;
1137
1138                         /* re-patch for this command */
1139                         script_patch_32_abs(hostdata->script, CommandAddress, 
1140                                             slot->pCmd);
1141                         script_patch_16(hostdata->script,
1142                                         CommandCount, slot->cmnd->cmd_len);
1143                         script_patch_32_abs(hostdata->script, SGScriptStartAddress,
1144                                             to32bit(&slot->pSG[0].ins));
1145
1146                         /* Note: setting SXFER only works if we're
1147                          * still in the MESSAGE phase, so it is vital
1148                          * that ACK is still asserted when we process
1149                          * the reselection message.  The resume offset
1150                          * should therefore always clear ACK */
1151                         NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1152                                        host, SXFER_REG);
1153                         dma_cache_sync(hostdata->msgin,
1154                                        MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1155                         dma_cache_sync(hostdata->msgout,
1156                                        MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1157                         /* I'm just being paranoid here, the command should
1158                          * already have been flushed from the cache */
1159                         dma_cache_sync(slot->cmnd->cmnd,
1160                                        slot->cmnd->cmd_len, DMA_TO_DEVICE);
1161
1162
1163                         
1164                 }
1165         } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1166
1167                 /* This section is full of debugging code because I've
1168                  * never managed to reach it.  I think what happens is
1169                  * that, because the 700 runs with selection
1170                  * interrupts enabled the whole time that we take a
1171                  * selection interrupt before we manage to get to the
1172                  * reselected script interrupt */
1173
1174                 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1175                 struct NCR_700_command_slot *slot;
1176                 
1177                 /* Take out our own ID */
1178                 reselection_id &= ~(1<<host->this_id);
1179                 
1180                 /* I've never seen this happen, so keep this as a printk rather
1181                  * than a debug */
1182                 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1183                        host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1184
1185                 {
1186                         /* FIXME: DEBUGGING CODE */
1187                         __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1188                         int i;
1189
1190                         for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1191                                 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1192                                    && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1193                                         break;
1194                         }
1195                         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);
1196                         SCp =  hostdata->slots[i].cmnd;
1197                 }
1198
1199                 if(SCp != NULL) {
1200                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1201                         /* change slot from busy to queued to redo command */
1202                         slot->state = NCR_700_SLOT_QUEUED;
1203                 }
1204                 hostdata->cmd = NULL;
1205                 
1206                 if(reselection_id == 0) {
1207                         if(hostdata->reselection_id == 0xff) {
1208                                 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1209                                 return 0;
1210                         } else {
1211                                 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1212                                        host->host_no);
1213                                 reselection_id = hostdata->reselection_id;
1214                         }
1215                 } else {
1216                         
1217                         /* convert to real ID */
1218                         reselection_id = bitmap_to_number(reselection_id);
1219                 }
1220                 hostdata->reselection_id = reselection_id;
1221                 /* just in case we have a stale simple tag message, clear it */
1222                 hostdata->msgin[1] = 0;
1223                 dma_cache_sync(hostdata->msgin,
1224                                MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1225                 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1226                         resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1227                 } else {
1228                         resume_offset = hostdata->pScript + Ent_GetReselectionData;
1229                 }
1230         } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1231                 /* we've just disconnected from the bus, do nothing since
1232                  * a return here will re-run the queued command slot
1233                  * that may have been interrupted by the initial selection */
1234                 DEBUG((" SELECTION COMPLETED\n"));
1235         } else if((dsps & 0xfffff0f0) == A_MSG_IN) { 
1236                 resume_offset = process_message(host, hostdata, SCp,
1237                                                 dsp, dsps);
1238         } else if((dsps &  0xfffff000) == 0) {
1239                 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1240                 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1241                        host->host_no, pun, lun, NCR_700_condition[i],
1242                        NCR_700_phase[j], dsp - hostdata->pScript);
1243                 if(SCp != NULL) {
1244                         scsi_print_command(SCp);
1245
1246                         if(SCp->use_sg) {
1247                                 for(i = 0; i < SCp->use_sg + 1; i++) {
1248                                         printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, ((struct scatterlist *)SCp->request_buffer)[i].length, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].ins, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].pAddr);
1249                                 }
1250                         }
1251                 }              
1252                 NCR_700_internal_bus_reset(host);
1253         } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1254                 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1255                        host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1256                 resume_offset = dsp;
1257         } else {
1258                 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1259                        host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1260                 NCR_700_internal_bus_reset(host);
1261         }
1262         return resume_offset;
1263 }
1264
1265 /* We run the 53c700 with selection interrupts always enabled.  This
1266  * means that the chip may be selected as soon as the bus frees.  On a
1267  * busy bus, this can be before the scripts engine finishes its
1268  * processing.  Therefore, part of the selection processing has to be
1269  * to find out what the scripts engine is doing and complete the
1270  * function if necessary (i.e. process the pending disconnect or save
1271  * the interrupted initial selection */
1272 STATIC inline __u32
1273 process_selection(struct Scsi_Host *host, __u32 dsp)
1274 {
1275         __u8 id = 0;    /* Squash compiler warning */
1276         int count = 0;
1277         __u32 resume_offset = 0;
1278         struct NCR_700_Host_Parameters *hostdata =
1279                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1280         struct scsi_cmnd *SCp = hostdata->cmd;
1281         __u8 sbcl;
1282
1283         for(count = 0; count < 5; count++) {
1284                 id = NCR_700_readb(host, hostdata->chip710 ?
1285                                    CTEST9_REG : SFBR_REG);
1286
1287                 /* Take out our own ID */
1288                 id &= ~(1<<host->this_id);
1289                 if(id != 0) 
1290                         break;
1291                 udelay(5);
1292         }
1293         sbcl = NCR_700_readb(host, SBCL_REG);
1294         if((sbcl & SBCL_IO) == 0) {
1295                 /* mark as having been selected rather than reselected */
1296                 id = 0xff;
1297         } else {
1298                 /* convert to real ID */
1299                 hostdata->reselection_id = id = bitmap_to_number(id);
1300                 DEBUG(("scsi%d:  Reselected by %d\n",
1301                        host->host_no, id));
1302         }
1303         if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1304                 struct NCR_700_command_slot *slot =
1305                         (struct NCR_700_command_slot *)SCp->host_scribble;
1306                 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));
1307                 
1308                 switch(dsp - hostdata->pScript) {
1309                 case Ent_Disconnect1:
1310                 case Ent_Disconnect2:
1311                         save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1312                         break;
1313                 case Ent_Disconnect3:
1314                 case Ent_Disconnect4:
1315                         save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1316                         break;
1317                 case Ent_Disconnect5:
1318                 case Ent_Disconnect6:
1319                         save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1320                         break;
1321                 case Ent_Disconnect7:
1322                 case Ent_Disconnect8:
1323                         save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1324                         break;
1325                 case Ent_Finish1:
1326                 case Ent_Finish2:
1327                         process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1328                         break;
1329                         
1330                 default:
1331                         slot->state = NCR_700_SLOT_QUEUED;
1332                         break;
1333                         }
1334         }
1335         hostdata->state = NCR_700_HOST_BUSY;
1336         hostdata->cmd = NULL;
1337         /* clear any stale simple tag message */
1338         hostdata->msgin[1] = 0;
1339         dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
1340                        DMA_BIDIRECTIONAL);
1341
1342         if(id == 0xff) {
1343                 /* Selected as target, Ignore */
1344                 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1345         } else if(hostdata->tag_negotiated & (1<<id)) {
1346                 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1347         } else {
1348                 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1349         }
1350         return resume_offset;
1351 }
1352
1353 static inline void
1354 NCR_700_clear_fifo(struct Scsi_Host *host) {
1355         const struct NCR_700_Host_Parameters *hostdata
1356                 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1357         if(hostdata->chip710) {
1358                 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1359         } else {
1360                 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1361         }
1362 }
1363
1364 static inline void
1365 NCR_700_flush_fifo(struct Scsi_Host *host) {
1366         const struct NCR_700_Host_Parameters *hostdata
1367                 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1368         if(hostdata->chip710) {
1369                 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1370                 udelay(10);
1371                 NCR_700_writeb(0, host, CTEST8_REG);
1372         } else {
1373                 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1374                 udelay(10);
1375                 NCR_700_writeb(0, host, DFIFO_REG);
1376         }
1377 }
1378
1379
1380 /* The queue lock with interrupts disabled must be held on entry to
1381  * this function */
1382 STATIC int
1383 NCR_700_start_command(struct scsi_cmnd *SCp)
1384 {
1385         struct NCR_700_command_slot *slot =
1386                 (struct NCR_700_command_slot *)SCp->host_scribble;
1387         struct NCR_700_Host_Parameters *hostdata =
1388                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1389         __u16 count = 1;        /* for IDENTIFY message */
1390         
1391         if(hostdata->state != NCR_700_HOST_FREE) {
1392                 /* keep this inside the lock to close the race window where
1393                  * the running command finishes on another CPU while we don't
1394                  * change the state to queued on this one */
1395                 slot->state = NCR_700_SLOT_QUEUED;
1396
1397                 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1398                        SCp->device->host->host_no, slot->cmnd, slot));
1399                 return 0;
1400         }
1401         hostdata->state = NCR_700_HOST_BUSY;
1402         hostdata->cmd = SCp;
1403         slot->state = NCR_700_SLOT_BUSY;
1404         /* keep interrupts disabled until we have the command correctly
1405          * set up so we cannot take a selection interrupt */
1406
1407         hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&
1408                                                 slot->flags != NCR_700_FLAG_AUTOSENSE),
1409                                                SCp->device->lun);
1410         /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1411          * if the negotiated transfer parameters still hold, so
1412          * always renegotiate them */
1413         if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||
1414            slot->flags == NCR_700_FLAG_AUTOSENSE) {
1415                 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1416         }
1417
1418         /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1419          * If a contingent allegiance condition exists, the device
1420          * will refuse all tags, so send the request sense as untagged
1421          * */
1422         if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1423            && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&
1424                slot->flags != NCR_700_FLAG_AUTOSENSE)) {
1425                 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
1426         }
1427
1428         if(hostdata->fast &&
1429            NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1430                 count += spi_populate_sync_msg(&hostdata->msgout[count],
1431                                 spi_period(SCp->device->sdev_target),
1432                                 spi_offset(SCp->device->sdev_target));
1433                 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1434         }
1435
1436         script_patch_16(hostdata->script, MessageCount, count);
1437
1438
1439         script_patch_ID(hostdata->script,
1440                         Device_ID, 1<<scmd_id(SCp));
1441
1442         script_patch_32_abs(hostdata->script, CommandAddress, 
1443                             slot->pCmd);
1444         script_patch_16(hostdata->script, CommandCount, SCp->cmd_len);
1445         /* finally plumb the beginning of the SG list into the script
1446          * */
1447         script_patch_32_abs(hostdata->script, SGScriptStartAddress,
1448                             to32bit(&slot->pSG[0].ins));
1449         NCR_700_clear_fifo(SCp->device->host);
1450
1451         if(slot->resume_offset == 0)
1452                 slot->resume_offset = hostdata->pScript;
1453         /* now perform all the writebacks and invalidates */
1454         dma_cache_sync(hostdata->msgout, count, DMA_TO_DEVICE);
1455         dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
1456                        DMA_FROM_DEVICE);
1457         dma_cache_sync(SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1458         dma_cache_sync(hostdata->status, 1, DMA_FROM_DEVICE);
1459
1460         /* set the synchronous period/offset */
1461         NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1462                        SCp->device->host, SXFER_REG);
1463         NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1464         NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1465
1466         return 1;
1467 }
1468
1469 irqreturn_t
1470 NCR_700_intr(int irq, void *dev_id)
1471 {
1472         struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1473         struct NCR_700_Host_Parameters *hostdata =
1474                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1475         __u8 istat;
1476         __u32 resume_offset = 0;
1477         __u8 pun = 0xff, lun = 0xff;
1478         unsigned long flags;
1479         int handled = 0;
1480
1481         /* Use the host lock to serialise acess to the 53c700
1482          * hardware.  Note: In future, we may need to take the queue
1483          * lock to enter the done routines.  When that happens, we
1484          * need to ensure that for this driver, the host lock and the
1485          * queue lock point to the same thing. */
1486         spin_lock_irqsave(host->host_lock, flags);
1487         if((istat = NCR_700_readb(host, ISTAT_REG))
1488               & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1489                 __u32 dsps;
1490                 __u8 sstat0 = 0, dstat = 0;
1491                 __u32 dsp;
1492                 struct scsi_cmnd *SCp = hostdata->cmd;
1493                 enum NCR_700_Host_State state;
1494
1495                 handled = 1;
1496                 state = hostdata->state;
1497                 SCp = hostdata->cmd;
1498
1499                 if(istat & SCSI_INT_PENDING) {
1500                         udelay(10);
1501
1502                         sstat0 = NCR_700_readb(host, SSTAT0_REG);
1503                 }
1504
1505                 if(istat & DMA_INT_PENDING) {
1506                         udelay(10);
1507
1508                         dstat = NCR_700_readb(host, DSTAT_REG);
1509                 }
1510
1511                 dsps = NCR_700_readl(host, DSPS_REG);
1512                 dsp = NCR_700_readl(host, DSP_REG);
1513
1514                 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1515                        host->host_no, istat, sstat0, dstat,
1516                        (dsp - (__u32)(hostdata->pScript))/4,
1517                        dsp, dsps));
1518
1519                 if(SCp != NULL) {
1520                         pun = SCp->device->id;
1521                         lun = SCp->device->lun;
1522                 }
1523
1524                 if(sstat0 & SCSI_RESET_DETECTED) {
1525                         struct scsi_device *SDp;
1526                         int i;
1527
1528                         hostdata->state = NCR_700_HOST_BUSY;
1529
1530                         printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1531                                host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1532
1533                         scsi_report_bus_reset(host, 0);
1534
1535                         /* clear all the negotiated parameters */
1536                         __shost_for_each_device(SDp, host)
1537                                 NCR_700_clear_flag(SDp, ~0);
1538                         
1539                         /* clear all the slots and their pending commands */
1540                         for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1541                                 struct scsi_cmnd *SCp;
1542                                 struct NCR_700_command_slot *slot =
1543                                         &hostdata->slots[i];
1544
1545                                 if(slot->state == NCR_700_SLOT_FREE)
1546                                         continue;
1547                                 
1548                                 SCp = slot->cmnd;
1549                                 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1550                                        slot, SCp);
1551                                 free_slot(slot, hostdata);
1552                                 SCp->host_scribble = NULL;
1553                                 NCR_700_set_depth(SCp->device, 0);
1554                                 /* NOTE: deadlock potential here: we
1555                                  * rely on mid-layer guarantees that
1556                                  * scsi_done won't try to issue the
1557                                  * command again otherwise we'll
1558                                  * deadlock on the
1559                                  * hostdata->state_lock */
1560                                 SCp->result = DID_RESET << 16;
1561                                 SCp->scsi_done(SCp);
1562                         }
1563                         mdelay(25);
1564                         NCR_700_chip_setup(host);
1565
1566                         hostdata->state = NCR_700_HOST_FREE;
1567                         hostdata->cmd = NULL;
1568                         /* signal back if this was an eh induced reset */
1569                         if(hostdata->eh_complete != NULL)
1570                                 complete(hostdata->eh_complete);
1571                         goto out_unlock;
1572                 } else if(sstat0 & SELECTION_TIMEOUT) {
1573                         DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1574                                host->host_no, pun, lun));
1575                         NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1576                 } else if(sstat0 & PHASE_MISMATCH) {
1577                         struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1578                                 (struct NCR_700_command_slot *)SCp->host_scribble;
1579
1580                         if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1581                                 /* It wants to reply to some part of
1582                                  * our message */
1583 #ifdef NCR_700_DEBUG
1584                                 __u32 temp = NCR_700_readl(host, TEMP_REG);
1585                                 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1586                                 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)));
1587 #endif
1588                                 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1589                         } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1590                                   dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1591                                 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1592                                 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1593                                 int residual = NCR_700_data_residual(host);
1594                                 int i;
1595 #ifdef NCR_700_DEBUG
1596                                 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1597
1598                                 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1599                                        host->host_no, pun, lun,
1600                                        SGcount, data_transfer);
1601                                 scsi_print_command(SCp);
1602                                 if(residual) {
1603                                         printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1604                                        host->host_no, pun, lun,
1605                                        SGcount, data_transfer, residual);
1606                                 }
1607 #endif
1608                                 data_transfer += residual;
1609
1610                                 if(data_transfer != 0) {
1611                                         int count; 
1612                                         __u32 pAddr;
1613
1614                                         SGcount--;
1615
1616                                         count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1617                                         DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1618                                         slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1619                                         slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1620                                         pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1621                                         pAddr += (count - data_transfer);
1622 #ifdef NCR_700_DEBUG
1623                                         if(pAddr != naddr) {
1624                                                 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);
1625                                         }
1626 #endif
1627                                         slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1628                                 }
1629                                 /* set the executed moves to nops */
1630                                 for(i=0; i<SGcount; i++) {
1631                                         slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1632                                         slot->SG[i].pAddr = 0;
1633                                 }
1634                                 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1635                                 /* and pretend we disconnected after
1636                                  * the command phase */
1637                                 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1638                                 /* make sure all the data is flushed */
1639                                 NCR_700_flush_fifo(host);
1640                         } else {
1641                                 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1642                                 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1643                                        host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1644                                 NCR_700_internal_bus_reset(host);
1645                         }
1646
1647                 } else if(sstat0 & SCSI_GROSS_ERROR) {
1648                         printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1649                                host->host_no, pun, lun);
1650                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1651                 } else if(sstat0 & PARITY_ERROR) {
1652                         printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1653                                host->host_no, pun, lun);
1654                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1655                 } else if(dstat & SCRIPT_INT_RECEIVED) {
1656                         DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1657                                host->host_no, pun, lun));
1658                         resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1659                 } else if(dstat & (ILGL_INST_DETECTED)) {
1660                         printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1661                                "         Please email James.Bottomley@HansenPartnership.com with the details\n",
1662                                host->host_no, pun, lun,
1663                                dsp, dsp - hostdata->pScript);
1664                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1665                 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1666                         printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1667                                host->host_no, pun, lun, dstat);
1668                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1669                 }
1670
1671                 
1672                 /* NOTE: selection interrupt processing MUST occur
1673                  * after script interrupt processing to correctly cope
1674                  * with the case where we process a disconnect and
1675                  * then get reselected before we process the
1676                  * disconnection */
1677                 if(sstat0 & SELECTED) {
1678                         /* FIXME: It currently takes at least FOUR
1679                          * interrupts to complete a command that
1680                          * disconnects: one for the disconnect, one
1681                          * for the reselection, one to get the
1682                          * reselection data and one to complete the
1683                          * command.  If we guess the reselected
1684                          * command here and prepare it, we only need
1685                          * to get a reselection data interrupt if we
1686                          * guessed wrongly.  Since the interrupt
1687                          * overhead is much greater than the command
1688                          * setup, this would be an efficient
1689                          * optimisation particularly as we probably
1690                          * only have one outstanding command on a
1691                          * target most of the time */
1692
1693                         resume_offset = process_selection(host, dsp);
1694
1695                 }
1696
1697         }
1698
1699         if(resume_offset) {
1700                 if(hostdata->state != NCR_700_HOST_BUSY) {
1701                         printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1702                                host->host_no, resume_offset, resume_offset - hostdata->pScript);
1703                         hostdata->state = NCR_700_HOST_BUSY;
1704                 }
1705
1706                 DEBUG(("Attempting to resume at %x\n", resume_offset));
1707                 NCR_700_clear_fifo(host);
1708                 NCR_700_writel(resume_offset, host, DSP_REG);
1709         } 
1710         /* There is probably a technical no-no about this: If we're a
1711          * shared interrupt and we got this interrupt because the
1712          * other device needs servicing not us, we're still going to
1713          * check our queued commands here---of course, there shouldn't
1714          * be any outstanding.... */
1715         if(hostdata->state == NCR_700_HOST_FREE) {
1716                 int i;
1717
1718                 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1719                         /* fairness: always run the queue from the last
1720                          * position we left off */
1721                         int j = (i + hostdata->saved_slot_position)
1722                                 % NCR_700_COMMAND_SLOTS_PER_HOST;
1723                         
1724                         if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1725                                 continue;
1726                         if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1727                                 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1728                                        host->host_no, &hostdata->slots[j],
1729                                        hostdata->slots[j].cmnd));
1730                                 hostdata->saved_slot_position = j + 1;
1731                         }
1732
1733                         break;
1734                 }
1735         }
1736  out_unlock:
1737         spin_unlock_irqrestore(host->host_lock, flags);
1738         return IRQ_RETVAL(handled);
1739 }
1740
1741 STATIC int
1742 NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1743 {
1744         struct NCR_700_Host_Parameters *hostdata = 
1745                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1746         __u32 move_ins;
1747         enum dma_data_direction direction;
1748         struct NCR_700_command_slot *slot;
1749
1750         if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1751                 /* We're over our allocation, this should never happen
1752                  * since we report the max allocation to the mid layer */
1753                 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1754                 return 1;
1755         }
1756         /* check for untagged commands.  We cannot have any outstanding
1757          * commands if we accept them.  Commands could be untagged because:
1758          *
1759          * - The tag negotiated bitmap is clear
1760          * - The blk layer sent and untagged command
1761          */
1762         if(NCR_700_get_depth(SCp->device) != 0
1763            && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1764                || !blk_rq_tagged(SCp->request))) {
1765                 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1766                        NCR_700_get_depth(SCp->device));
1767                 return SCSI_MLQUEUE_DEVICE_BUSY;
1768         }
1769         if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1770                 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1771                        NCR_700_get_depth(SCp->device));
1772                 return SCSI_MLQUEUE_DEVICE_BUSY;
1773         }
1774         NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1775
1776         /* begin the command here */
1777         /* no need to check for NULL, test for command_slot_count above
1778          * ensures a slot is free */
1779         slot = find_empty_slot(hostdata);
1780
1781         slot->cmnd = SCp;
1782
1783         SCp->scsi_done = done;
1784         SCp->host_scribble = (unsigned char *)slot;
1785         SCp->SCp.ptr = NULL;
1786         SCp->SCp.buffer = NULL;
1787
1788 #ifdef NCR_700_DEBUG
1789         printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1790         scsi_print_command(SCp);
1791 #endif
1792         if(blk_rq_tagged(SCp->request)
1793            && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1794            && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1795                 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1796                 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1797                 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1798         }
1799
1800         /* here we may have to process an untagged command.  The gate
1801          * above ensures that this will be the only one outstanding,
1802          * so clear the tag negotiated bit.
1803          *
1804          * FIXME: This will royally screw up on multiple LUN devices
1805          * */
1806         if(!blk_rq_tagged(SCp->request)
1807            && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1808                 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1809                 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1810         }
1811
1812         if((hostdata->tag_negotiated &(1<<scmd_id(SCp)))
1813            && scsi_get_tag_type(SCp->device)) {
1814                 slot->tag = SCp->request->tag;
1815                 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1816                        slot->tag, slot);
1817         } else {
1818                 slot->tag = SCSI_NO_TAG;
1819                 /* must populate current_cmnd for scsi_find_tag to work */
1820                 SCp->device->current_cmnd = SCp;
1821         }
1822         /* sanity check: some of the commands generated by the mid-layer
1823          * have an eccentric idea of their sc_data_direction */
1824         if(!SCp->use_sg && !SCp->request_bufflen 
1825            && SCp->sc_data_direction != DMA_NONE) {
1826 #ifdef NCR_700_DEBUG
1827                 printk("53c700: Command");
1828                 scsi_print_command(SCp);
1829                 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1830 #endif
1831                 SCp->sc_data_direction = DMA_NONE;
1832         }
1833
1834         switch (SCp->cmnd[0]) {
1835         case REQUEST_SENSE:
1836                 /* clear the internal sense magic */
1837                 SCp->cmnd[6] = 0;
1838                 /* fall through */
1839         default:
1840                 /* OK, get it from the command */
1841                 switch(SCp->sc_data_direction) {
1842                 case DMA_BIDIRECTIONAL:
1843                 default:
1844                         printk(KERN_ERR "53c700: Unknown command for data direction ");
1845                         scsi_print_command(SCp);
1846                         
1847                         move_ins = 0;
1848                         break;
1849                 case DMA_NONE:
1850                         move_ins = 0;
1851                         break;
1852                 case DMA_FROM_DEVICE:
1853                         move_ins = SCRIPT_MOVE_DATA_IN;
1854                         break;
1855                 case DMA_TO_DEVICE:
1856                         move_ins = SCRIPT_MOVE_DATA_OUT;
1857                         break;
1858                 }
1859         }
1860
1861         /* now build the scatter gather list */
1862         direction = SCp->sc_data_direction;
1863         if(move_ins != 0) {
1864                 int i;
1865                 int sg_count;
1866                 dma_addr_t vPtr = 0;
1867                 __u32 count = 0;
1868
1869                 if(SCp->use_sg) {
1870                         sg_count = dma_map_sg(hostdata->dev,
1871                                               SCp->request_buffer, SCp->use_sg,
1872                                               direction);
1873                 } else {
1874                         vPtr = dma_map_single(hostdata->dev,
1875                                               SCp->request_buffer, 
1876                                               SCp->request_bufflen,
1877                                               direction);
1878                         count = SCp->request_bufflen;
1879                         slot->dma_handle = vPtr;
1880                         sg_count = 1;
1881                 }
1882                         
1883
1884                 for(i = 0; i < sg_count; i++) {
1885
1886                         if(SCp->use_sg) {
1887                                 struct scatterlist *sg = SCp->request_buffer;
1888
1889                                 vPtr = sg_dma_address(&sg[i]);
1890                                 count = sg_dma_len(&sg[i]);
1891                         }
1892
1893                         slot->SG[i].ins = bS_to_host(move_ins | count);
1894                         DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1895                                i, count, slot->SG[i].ins, (unsigned long)vPtr));
1896                         slot->SG[i].pAddr = bS_to_host(vPtr);
1897                 }
1898                 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1899                 slot->SG[i].pAddr = 0;
1900                 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1901                 DEBUG((" SETTING %08lx to %x\n",
1902                        (&slot->pSG[i].ins), 
1903                        slot->SG[i].ins));
1904         }
1905         slot->resume_offset = 0;
1906         slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1907                                     sizeof(SCp->cmnd), DMA_TO_DEVICE);
1908         NCR_700_start_command(SCp);
1909         return 0;
1910 }
1911
1912 STATIC int
1913 NCR_700_abort(struct scsi_cmnd * SCp)
1914 {
1915         struct NCR_700_command_slot *slot;
1916
1917         scmd_printk(KERN_INFO, SCp,
1918                 "New error handler wants to abort command\n\t");
1919         scsi_print_command(SCp);
1920
1921         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1922
1923         if(slot == NULL)
1924                 /* no outstanding command to abort */
1925                 return SUCCESS;
1926         if(SCp->cmnd[0] == TEST_UNIT_READY) {
1927                 /* FIXME: This is because of a problem in the new
1928                  * error handler.  When it is in error recovery, it
1929                  * will send a TUR to a device it thinks may still be
1930                  * showing a problem.  If the TUR isn't responded to,
1931                  * it will abort it and mark the device off line.
1932                  * Unfortunately, it does no other error recovery, so
1933                  * this would leave us with an outstanding command
1934                  * occupying a slot.  Rather than allow this to
1935                  * happen, we issue a bus reset to force all
1936                  * outstanding commands to terminate here. */
1937                 NCR_700_internal_bus_reset(SCp->device->host);
1938                 /* still drop through and return failed */
1939         }
1940         return FAILED;
1941
1942 }
1943
1944 STATIC int
1945 NCR_700_bus_reset(struct scsi_cmnd * SCp)
1946 {
1947         DECLARE_COMPLETION_ONSTACK(complete);
1948         struct NCR_700_Host_Parameters *hostdata = 
1949                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1950
1951         scmd_printk(KERN_INFO, SCp,
1952                 "New error handler wants BUS reset, cmd %p\n\t", SCp);
1953         scsi_print_command(SCp);
1954
1955         /* In theory, eh_complete should always be null because the
1956          * eh is single threaded, but just in case we're handling a
1957          * reset via sg or something */
1958         spin_lock_irq(SCp->device->host->host_lock);
1959         while (hostdata->eh_complete != NULL) {
1960                 spin_unlock_irq(SCp->device->host->host_lock);
1961                 msleep_interruptible(100);
1962                 spin_lock_irq(SCp->device->host->host_lock);
1963         }
1964
1965         hostdata->eh_complete = &complete;
1966         NCR_700_internal_bus_reset(SCp->device->host);
1967
1968         spin_unlock_irq(SCp->device->host->host_lock);
1969         wait_for_completion(&complete);
1970         spin_lock_irq(SCp->device->host->host_lock);
1971
1972         hostdata->eh_complete = NULL;
1973         /* Revalidate the transport parameters of the failing device */
1974         if(hostdata->fast)
1975                 spi_schedule_dv_device(SCp->device);
1976
1977         spin_unlock_irq(SCp->device->host->host_lock);
1978         return SUCCESS;
1979 }
1980
1981 STATIC int
1982 NCR_700_host_reset(struct scsi_cmnd * SCp)
1983 {
1984         scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset\n\t");
1985         scsi_print_command(SCp);
1986
1987         spin_lock_irq(SCp->device->host->host_lock);
1988
1989         NCR_700_internal_bus_reset(SCp->device->host);
1990         NCR_700_chip_reset(SCp->device->host);
1991
1992         spin_unlock_irq(SCp->device->host->host_lock);
1993
1994         return SUCCESS;
1995 }
1996
1997 STATIC void
1998 NCR_700_set_period(struct scsi_target *STp, int period)
1999 {
2000         struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2001         struct NCR_700_Host_Parameters *hostdata = 
2002                 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2003         
2004         if(!hostdata->fast)
2005                 return;
2006
2007         if(period < hostdata->min_period)
2008                 period = hostdata->min_period;
2009
2010         spi_period(STp) = period;
2011         spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2012                             NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2013         spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2014 }
2015
2016 STATIC void
2017 NCR_700_set_offset(struct scsi_target *STp, int offset)
2018 {
2019         struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2020         struct NCR_700_Host_Parameters *hostdata = 
2021                 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2022         int max_offset = hostdata->chip710
2023                 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2024         
2025         if(!hostdata->fast)
2026                 return;
2027
2028         if(offset > max_offset)
2029                 offset = max_offset;
2030
2031         /* if we're currently async, make sure the period is reasonable */
2032         if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2033                                     spi_period(STp) > 0xff))
2034                 spi_period(STp) = hostdata->min_period;
2035
2036         spi_offset(STp) = offset;
2037         spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2038                             NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2039         spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2040 }
2041
2042 STATIC int
2043 NCR_700_slave_alloc(struct scsi_device *SDp)
2044 {
2045         SDp->hostdata = kzalloc(sizeof(struct NCR_700_Device_Parameters),
2046                                 GFP_KERNEL);
2047
2048         if (!SDp->hostdata)
2049                 return -ENOMEM;
2050
2051         return 0;
2052 }
2053
2054 STATIC int
2055 NCR_700_slave_configure(struct scsi_device *SDp)
2056 {
2057         struct NCR_700_Host_Parameters *hostdata = 
2058                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2059
2060         /* to do here: allocate memory; build a queue_full list */
2061         if(SDp->tagged_supported) {
2062                 scsi_set_tag_type(SDp, MSG_ORDERED_TAG);
2063                 scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS);
2064                 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2065         } else {
2066                 /* initialise to default depth */
2067                 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
2068         }
2069         if(hostdata->fast) {
2070                 /* Find the correct offset and period via domain validation */
2071                 if (!spi_initial_dv(SDp->sdev_target))
2072                         spi_dv_device(SDp);
2073         } else {
2074                 spi_offset(SDp->sdev_target) = 0;
2075                 spi_period(SDp->sdev_target) = 0;
2076         }
2077         return 0;
2078 }
2079
2080 STATIC void
2081 NCR_700_slave_destroy(struct scsi_device *SDp)
2082 {
2083         kfree(SDp->hostdata);
2084         SDp->hostdata = NULL;
2085 }
2086
2087 static int
2088 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth)
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