[PATCH] Pass struct dev pointer to dma_cache_sync()
[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(hostdata->dev, script, MessageLocation,
366                         pScript + MSGOUT_OFFSET);
367         script_patch_32(hostdata->dev, script, StatusAddress,
368                         pScript + STATUS_OFFSET);
369         script_patch_32(hostdata->dev, 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->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
825                         script_patch_16(hostdata->dev, hostdata->script,
826                                         MessageCount, 1);
827                         /* SendMsgOut returns, so set up the return
828                          * address */
829                         resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
830                 }
831                 break;
832         
833         case A_WDTR_MSG:
834                 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
835                        host->host_no, pun, lun);
836                 hostdata->msgout[0] = A_REJECT_MSG;
837                 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
838                 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
839                                 1);
840                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
841
842                 break;
843
844         default:
845                 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
846                        host->host_no, pun, lun,
847                        NCR_700_phase[(dsps & 0xf00) >> 8]);
848                 spi_print_msg(hostdata->msgin);
849                 printk("\n");
850                 /* just reject it */
851                 hostdata->msgout[0] = A_REJECT_MSG;
852                 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
853                 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
854                                 1);
855                 /* SendMsgOut returns, so set up the return
856                  * address */
857                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
858         }
859         NCR_700_writel(temp, host, TEMP_REG);
860         return resume_offset;
861 }
862
863 STATIC __u32
864 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
865                 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
866 {
867         /* work out where to return to */
868         __u32 temp = dsp + 8, resume_offset = dsp;
869         __u8 pun = 0xff, lun = 0xff;
870
871         if(SCp != NULL) {
872                 pun = SCp->device->id;
873                 lun = SCp->device->lun;
874         }
875
876 #ifdef NCR_700_DEBUG
877         printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
878                NCR_700_phase[(dsps & 0xf00) >> 8]);
879         spi_print_msg(hostdata->msgin);
880         printk("\n");
881 #endif
882
883         switch(hostdata->msgin[0]) {
884
885         case A_EXTENDED_MSG:
886                 resume_offset =  process_extended_message(host, hostdata, SCp,
887                                                           dsp, dsps);
888                 break;
889
890         case A_REJECT_MSG:
891                 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
892                         /* Rejected our sync negotiation attempt */
893                         spi_period(SCp->device->sdev_target) =
894                                 spi_offset(SCp->device->sdev_target) = 0;
895                         NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
896                         NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
897                 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
898                         /* rejected our first simple tag message */
899                         scmd_printk(KERN_WARNING, SCp,
900                                 "Rejected first tag queue attempt, turning off tag queueing\n");
901                         /* we're done negotiating */
902                         NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
903                         hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
904                         SCp->device->tagged_supported = 0;
905                         scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
906                 } else {
907                         shost_printk(KERN_WARNING, host,
908                                 "(%d:%d) Unexpected REJECT Message %s\n",
909                                pun, lun,
910                                NCR_700_phase[(dsps & 0xf00) >> 8]);
911                         /* however, just ignore it */
912                 }
913                 break;
914
915         case A_PARITY_ERROR_MSG:
916                 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
917                        pun, lun);
918                 NCR_700_internal_bus_reset(host);
919                 break;
920         case A_SIMPLE_TAG_MSG:
921                 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
922                        pun, lun, hostdata->msgin[1],
923                        NCR_700_phase[(dsps & 0xf00) >> 8]);
924                 /* just ignore it */
925                 break;
926         default:
927                 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
928                        host->host_no, pun, lun,
929                        NCR_700_phase[(dsps & 0xf00) >> 8]);
930
931                 spi_print_msg(hostdata->msgin);
932                 printk("\n");
933                 /* just reject it */
934                 hostdata->msgout[0] = A_REJECT_MSG;
935                 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
936                 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
937                                 1);
938                 /* SendMsgOut returns, so set up the return
939                  * address */
940                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
941
942                 break;
943         }
944         NCR_700_writel(temp, host, TEMP_REG);
945         /* set us up to receive another message */
946         dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
947         return resume_offset;
948 }
949
950 STATIC __u32
951 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
952                          struct Scsi_Host *host,
953                          struct NCR_700_Host_Parameters *hostdata)
954 {
955         __u32 resume_offset = 0;
956         __u8 pun = 0xff, lun=0xff;
957
958         if(SCp != NULL) {
959                 pun = SCp->device->id;
960                 lun = SCp->device->lun;
961         }
962
963         if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
964                 DEBUG(("  COMMAND COMPLETE, status=%02x\n",
965                        hostdata->status[0]));
966                 /* OK, if TCQ still under negotiation, we now know it works */
967                 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
968                         NCR_700_set_tag_neg_state(SCp->device,
969                                                   NCR_700_FINISHED_TAG_NEGOTIATION);
970                         
971                 /* check for contingent allegiance contitions */
972                 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
973                    status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
974                         struct NCR_700_command_slot *slot =
975                                 (struct NCR_700_command_slot *)SCp->host_scribble;
976                         if(slot->flags == NCR_700_FLAG_AUTOSENSE) {
977                                 /* OOPS: bad device, returning another
978                                  * contingent allegiance condition */
979                                 scmd_printk(KERN_ERR, SCp,
980                                         "broken device is looping in contingent allegiance: ignoring\n");
981                                 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
982                         } else {
983                                 char *cmnd =
984                                         NCR_700_get_sense_cmnd(SCp->device);
985 #ifdef NCR_DEBUG
986                                 scsi_print_command(SCp);
987                                 printk("  cmd %p has status %d, requesting sense\n",
988                                        SCp, hostdata->status[0]);
989 #endif
990                                 /* we can destroy the command here
991                                  * because the contingent allegiance
992                                  * condition will cause a retry which
993                                  * will re-copy the command from the
994                                  * saved data_cmnd.  We also unmap any
995                                  * data associated with the command
996                                  * here */
997                                 NCR_700_unmap(hostdata, SCp, slot);
998                                 dma_unmap_single(hostdata->dev, slot->pCmd,
999                                                  sizeof(SCp->cmnd),
1000                                                  DMA_TO_DEVICE);
1001
1002                                 cmnd[0] = REQUEST_SENSE;
1003                                 cmnd[1] = (SCp->device->lun & 0x7) << 5;
1004                                 cmnd[2] = 0;
1005                                 cmnd[3] = 0;
1006                                 cmnd[4] = sizeof(SCp->sense_buffer);
1007                                 cmnd[5] = 0;
1008                                 /* Here's a quiet hack: the
1009                                  * REQUEST_SENSE command is six bytes,
1010                                  * so store a flag indicating that
1011                                  * this was an internal sense request
1012                                  * and the original status at the end
1013                                  * of the command */
1014                                 cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1015                                 cmnd[7] = hostdata->status[0];
1016                                 cmnd[8] = SCp->cmd_len;
1017                                 SCp->cmd_len = 6; /* command length for
1018                                                    * REQUEST_SENSE */
1019                                 slot->pCmd = dma_map_single(hostdata->dev, cmnd, MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1020                                 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1021                                 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | sizeof(SCp->sense_buffer));
1022                                 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1023                                 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1024                                 slot->SG[1].pAddr = 0;
1025                                 slot->resume_offset = hostdata->pScript;
1026                                 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1027                                 dma_cache_sync(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1028
1029                                 /* queue the command for reissue */
1030                                 slot->state = NCR_700_SLOT_QUEUED;
1031                                 slot->flags = NCR_700_FLAG_AUTOSENSE;
1032                                 hostdata->state = NCR_700_HOST_FREE;
1033                                 hostdata->cmd = NULL;
1034                         }
1035                 } else {
1036                         // Currently rely on the mid layer evaluation
1037                         // of the tag queuing capability
1038                         //
1039                         //if(status_byte(hostdata->status[0]) == GOOD &&
1040                         //   SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1041                         //      /* Piggy back the tag queueing support
1042                         //       * on this command */
1043                         //      dma_sync_single_for_cpu(hostdata->dev,
1044                         //                          slot->dma_handle,
1045                         //                          SCp->request_bufflen,
1046                         //                          DMA_FROM_DEVICE);
1047                         //      if(((char *)SCp->request_buffer)[7] & 0x02) {
1048                         //              scmd_printk(KERN_INFO, SCp,
1049                         //                   "Enabling Tag Command Queuing\n");
1050                         //              hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1051                         //              NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1052                         //      } else {
1053                         //              NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1054                         //              hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1055                         //      }
1056                         //}
1057                         NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1058                 }
1059         } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1060                 __u8 i = (dsps & 0xf00) >> 8;
1061
1062                 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1063                        NCR_700_phase[i],
1064                        sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1065                 scmd_printk(KERN_ERR, SCp, "         len = %d, cmd =",
1066                         SCp->cmd_len);
1067                 scsi_print_command(SCp);
1068
1069                 NCR_700_internal_bus_reset(host);
1070         } else if((dsps & 0xfffff000) == A_FATAL) {
1071                 int i = (dsps & 0xfff);
1072
1073                 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1074                        host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1075                 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1076                         printk(KERN_ERR "     msg begins %02x %02x\n",
1077                                hostdata->msgin[0], hostdata->msgin[1]);
1078                 }
1079                 NCR_700_internal_bus_reset(host);
1080         } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1081 #ifdef NCR_700_DEBUG
1082                 __u8 i = (dsps & 0xf00) >> 8;
1083
1084                 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1085                        host->host_no, pun, lun,
1086                        i, NCR_700_phase[i]);
1087 #endif
1088                 save_for_reselection(hostdata, SCp, dsp);
1089
1090         } else if(dsps == A_RESELECTION_IDENTIFIED) {
1091                 __u8 lun;
1092                 struct NCR_700_command_slot *slot;
1093                 __u8 reselection_id = hostdata->reselection_id;
1094                 struct scsi_device *SDp;
1095
1096                 lun = hostdata->msgin[0] & 0x1f;
1097
1098                 hostdata->reselection_id = 0xff;
1099                 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1100                        host->host_no, reselection_id, lun));
1101                 /* clear the reselection indicator */
1102                 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1103                 if(unlikely(SDp == NULL)) {
1104                         printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1105                                host->host_no, reselection_id, lun);
1106                         BUG();
1107                 }
1108                 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1109                         struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1110                         if(unlikely(SCp == NULL)) {
1111                                 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n", 
1112                                        host->host_no, reselection_id, lun, hostdata->msgin[2]);
1113                                 BUG();
1114                         }
1115
1116                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1117                         DDEBUG(KERN_DEBUG, SDp,
1118                                 "reselection is tag %d, slot %p(%d)\n",
1119                                 hostdata->msgin[2], slot, slot->tag);
1120                 } else {
1121                         struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1122                         if(unlikely(SCp == NULL)) {
1123                                 sdev_printk(KERN_ERR, SDp,
1124                                         "no saved request for untagged cmd\n");
1125                                 BUG();
1126                         }
1127                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1128                 }
1129
1130                 if(slot == NULL) {
1131                         printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1132                                host->host_no, reselection_id, lun,
1133                                hostdata->msgin[0], hostdata->msgin[1],
1134                                hostdata->msgin[2]);
1135                 } else {
1136                         if(hostdata->state != NCR_700_HOST_BUSY)
1137                                 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1138                                        host->host_no);
1139                         resume_offset = slot->resume_offset;
1140                         hostdata->cmd = slot->cmnd;
1141
1142                         /* re-patch for this command */
1143                         script_patch_32_abs(hostdata->dev, hostdata->script,
1144                                             CommandAddress, slot->pCmd);
1145                         script_patch_16(hostdata->dev, hostdata->script,
1146                                         CommandCount, slot->cmnd->cmd_len);
1147                         script_patch_32_abs(hostdata->dev, hostdata->script,
1148                                             SGScriptStartAddress,
1149                                             to32bit(&slot->pSG[0].ins));
1150
1151                         /* Note: setting SXFER only works if we're
1152                          * still in the MESSAGE phase, so it is vital
1153                          * that ACK is still asserted when we process
1154                          * the reselection message.  The resume offset
1155                          * should therefore always clear ACK */
1156                         NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1157                                        host, SXFER_REG);
1158                         dma_cache_sync(hostdata->dev, hostdata->msgin,
1159                                        MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1160                         dma_cache_sync(hostdata->dev, hostdata->msgout,
1161                                        MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1162                         /* I'm just being paranoid here, the command should
1163                          * already have been flushed from the cache */
1164                         dma_cache_sync(hostdata->dev, slot->cmnd->cmnd,
1165                                        slot->cmnd->cmd_len, DMA_TO_DEVICE);
1166
1167
1168                         
1169                 }
1170         } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1171
1172                 /* This section is full of debugging code because I've
1173                  * never managed to reach it.  I think what happens is
1174                  * that, because the 700 runs with selection
1175                  * interrupts enabled the whole time that we take a
1176                  * selection interrupt before we manage to get to the
1177                  * reselected script interrupt */
1178
1179                 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1180                 struct NCR_700_command_slot *slot;
1181                 
1182                 /* Take out our own ID */
1183                 reselection_id &= ~(1<<host->this_id);
1184                 
1185                 /* I've never seen this happen, so keep this as a printk rather
1186                  * than a debug */
1187                 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1188                        host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1189
1190                 {
1191                         /* FIXME: DEBUGGING CODE */
1192                         __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1193                         int i;
1194
1195                         for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1196                                 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1197                                    && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1198                                         break;
1199                         }
1200                         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);
1201                         SCp =  hostdata->slots[i].cmnd;
1202                 }
1203
1204                 if(SCp != NULL) {
1205                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1206                         /* change slot from busy to queued to redo command */
1207                         slot->state = NCR_700_SLOT_QUEUED;
1208                 }
1209                 hostdata->cmd = NULL;
1210                 
1211                 if(reselection_id == 0) {
1212                         if(hostdata->reselection_id == 0xff) {
1213                                 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1214                                 return 0;
1215                         } else {
1216                                 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1217                                        host->host_no);
1218                                 reselection_id = hostdata->reselection_id;
1219                         }
1220                 } else {
1221                         
1222                         /* convert to real ID */
1223                         reselection_id = bitmap_to_number(reselection_id);
1224                 }
1225                 hostdata->reselection_id = reselection_id;
1226                 /* just in case we have a stale simple tag message, clear it */
1227                 hostdata->msgin[1] = 0;
1228                 dma_cache_sync(hostdata->dev, hostdata->msgin,
1229                                MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1230                 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1231                         resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1232                 } else {
1233                         resume_offset = hostdata->pScript + Ent_GetReselectionData;
1234                 }
1235         } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1236                 /* we've just disconnected from the bus, do nothing since
1237                  * a return here will re-run the queued command slot
1238                  * that may have been interrupted by the initial selection */
1239                 DEBUG((" SELECTION COMPLETED\n"));
1240         } else if((dsps & 0xfffff0f0) == A_MSG_IN) { 
1241                 resume_offset = process_message(host, hostdata, SCp,
1242                                                 dsp, dsps);
1243         } else if((dsps &  0xfffff000) == 0) {
1244                 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1245                 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1246                        host->host_no, pun, lun, NCR_700_condition[i],
1247                        NCR_700_phase[j], dsp - hostdata->pScript);
1248                 if(SCp != NULL) {
1249                         scsi_print_command(SCp);
1250
1251                         if(SCp->use_sg) {
1252                                 for(i = 0; i < SCp->use_sg + 1; i++) {
1253                                         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);
1254                                 }
1255                         }
1256                 }              
1257                 NCR_700_internal_bus_reset(host);
1258         } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1259                 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1260                        host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1261                 resume_offset = dsp;
1262         } else {
1263                 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1264                        host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1265                 NCR_700_internal_bus_reset(host);
1266         }
1267         return resume_offset;
1268 }
1269
1270 /* We run the 53c700 with selection interrupts always enabled.  This
1271  * means that the chip may be selected as soon as the bus frees.  On a
1272  * busy bus, this can be before the scripts engine finishes its
1273  * processing.  Therefore, part of the selection processing has to be
1274  * to find out what the scripts engine is doing and complete the
1275  * function if necessary (i.e. process the pending disconnect or save
1276  * the interrupted initial selection */
1277 STATIC inline __u32
1278 process_selection(struct Scsi_Host *host, __u32 dsp)
1279 {
1280         __u8 id = 0;    /* Squash compiler warning */
1281         int count = 0;
1282         __u32 resume_offset = 0;
1283         struct NCR_700_Host_Parameters *hostdata =
1284                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1285         struct scsi_cmnd *SCp = hostdata->cmd;
1286         __u8 sbcl;
1287
1288         for(count = 0; count < 5; count++) {
1289                 id = NCR_700_readb(host, hostdata->chip710 ?
1290                                    CTEST9_REG : SFBR_REG);
1291
1292                 /* Take out our own ID */
1293                 id &= ~(1<<host->this_id);
1294                 if(id != 0) 
1295                         break;
1296                 udelay(5);
1297         }
1298         sbcl = NCR_700_readb(host, SBCL_REG);
1299         if((sbcl & SBCL_IO) == 0) {
1300                 /* mark as having been selected rather than reselected */
1301                 id = 0xff;
1302         } else {
1303                 /* convert to real ID */
1304                 hostdata->reselection_id = id = bitmap_to_number(id);
1305                 DEBUG(("scsi%d:  Reselected by %d\n",
1306                        host->host_no, id));
1307         }
1308         if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1309                 struct NCR_700_command_slot *slot =
1310                         (struct NCR_700_command_slot *)SCp->host_scribble;
1311                 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));
1312                 
1313                 switch(dsp - hostdata->pScript) {
1314                 case Ent_Disconnect1:
1315                 case Ent_Disconnect2:
1316                         save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1317                         break;
1318                 case Ent_Disconnect3:
1319                 case Ent_Disconnect4:
1320                         save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1321                         break;
1322                 case Ent_Disconnect5:
1323                 case Ent_Disconnect6:
1324                         save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1325                         break;
1326                 case Ent_Disconnect7:
1327                 case Ent_Disconnect8:
1328                         save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1329                         break;
1330                 case Ent_Finish1:
1331                 case Ent_Finish2:
1332                         process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1333                         break;
1334                         
1335                 default:
1336                         slot->state = NCR_700_SLOT_QUEUED;
1337                         break;
1338                         }
1339         }
1340         hostdata->state = NCR_700_HOST_BUSY;
1341         hostdata->cmd = NULL;
1342         /* clear any stale simple tag message */
1343         hostdata->msgin[1] = 0;
1344         dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1345                        DMA_BIDIRECTIONAL);
1346
1347         if(id == 0xff) {
1348                 /* Selected as target, Ignore */
1349                 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1350         } else if(hostdata->tag_negotiated & (1<<id)) {
1351                 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1352         } else {
1353                 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1354         }
1355         return resume_offset;
1356 }
1357
1358 static inline void
1359 NCR_700_clear_fifo(struct Scsi_Host *host) {
1360         const struct NCR_700_Host_Parameters *hostdata
1361                 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1362         if(hostdata->chip710) {
1363                 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1364         } else {
1365                 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1366         }
1367 }
1368
1369 static inline void
1370 NCR_700_flush_fifo(struct Scsi_Host *host) {
1371         const struct NCR_700_Host_Parameters *hostdata
1372                 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1373         if(hostdata->chip710) {
1374                 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1375                 udelay(10);
1376                 NCR_700_writeb(0, host, CTEST8_REG);
1377         } else {
1378                 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1379                 udelay(10);
1380                 NCR_700_writeb(0, host, DFIFO_REG);
1381         }
1382 }
1383
1384
1385 /* The queue lock with interrupts disabled must be held on entry to
1386  * this function */
1387 STATIC int
1388 NCR_700_start_command(struct scsi_cmnd *SCp)
1389 {
1390         struct NCR_700_command_slot *slot =
1391                 (struct NCR_700_command_slot *)SCp->host_scribble;
1392         struct NCR_700_Host_Parameters *hostdata =
1393                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1394         __u16 count = 1;        /* for IDENTIFY message */
1395         
1396         if(hostdata->state != NCR_700_HOST_FREE) {
1397                 /* keep this inside the lock to close the race window where
1398                  * the running command finishes on another CPU while we don't
1399                  * change the state to queued on this one */
1400                 slot->state = NCR_700_SLOT_QUEUED;
1401
1402                 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1403                        SCp->device->host->host_no, slot->cmnd, slot));
1404                 return 0;
1405         }
1406         hostdata->state = NCR_700_HOST_BUSY;
1407         hostdata->cmd = SCp;
1408         slot->state = NCR_700_SLOT_BUSY;
1409         /* keep interrupts disabled until we have the command correctly
1410          * set up so we cannot take a selection interrupt */
1411
1412         hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&
1413                                                 slot->flags != NCR_700_FLAG_AUTOSENSE),
1414                                                SCp->device->lun);
1415         /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1416          * if the negotiated transfer parameters still hold, so
1417          * always renegotiate them */
1418         if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||
1419            slot->flags == NCR_700_FLAG_AUTOSENSE) {
1420                 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1421         }
1422
1423         /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1424          * If a contingent allegiance condition exists, the device
1425          * will refuse all tags, so send the request sense as untagged
1426          * */
1427         if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1428            && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&
1429                slot->flags != NCR_700_FLAG_AUTOSENSE)) {
1430                 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
1431         }
1432
1433         if(hostdata->fast &&
1434            NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1435                 count += spi_populate_sync_msg(&hostdata->msgout[count],
1436                                 spi_period(SCp->device->sdev_target),
1437                                 spi_offset(SCp->device->sdev_target));
1438                 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1439         }
1440
1441         script_patch_16(hostdata->dev, hostdata->script, MessageCount, count);
1442
1443
1444         script_patch_ID(hostdata->dev, hostdata->script,
1445                         Device_ID, 1<<scmd_id(SCp));
1446
1447         script_patch_32_abs(hostdata->dev, hostdata->script, CommandAddress,
1448                             slot->pCmd);
1449         script_patch_16(hostdata->dev, hostdata->script, CommandCount,
1450                         SCp->cmd_len);
1451         /* finally plumb the beginning of the SG list into the script
1452          * */
1453         script_patch_32_abs(hostdata->dev, hostdata->script,
1454                             SGScriptStartAddress, to32bit(&slot->pSG[0].ins));
1455         NCR_700_clear_fifo(SCp->device->host);
1456
1457         if(slot->resume_offset == 0)
1458                 slot->resume_offset = hostdata->pScript;
1459         /* now perform all the writebacks and invalidates */
1460         dma_cache_sync(hostdata->dev, hostdata->msgout, count, DMA_TO_DEVICE);
1461         dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1462                        DMA_FROM_DEVICE);
1463         dma_cache_sync(hostdata->dev, SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1464         dma_cache_sync(hostdata->dev, hostdata->status, 1, DMA_FROM_DEVICE);
1465
1466         /* set the synchronous period/offset */
1467         NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1468                        SCp->device->host, SXFER_REG);
1469         NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1470         NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1471
1472         return 1;
1473 }
1474
1475 irqreturn_t
1476 NCR_700_intr(int irq, void *dev_id)
1477 {
1478         struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1479         struct NCR_700_Host_Parameters *hostdata =
1480                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1481         __u8 istat;
1482         __u32 resume_offset = 0;
1483         __u8 pun = 0xff, lun = 0xff;
1484         unsigned long flags;
1485         int handled = 0;
1486
1487         /* Use the host lock to serialise acess to the 53c700
1488          * hardware.  Note: In future, we may need to take the queue
1489          * lock to enter the done routines.  When that happens, we
1490          * need to ensure that for this driver, the host lock and the
1491          * queue lock point to the same thing. */
1492         spin_lock_irqsave(host->host_lock, flags);
1493         if((istat = NCR_700_readb(host, ISTAT_REG))
1494               & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1495                 __u32 dsps;
1496                 __u8 sstat0 = 0, dstat = 0;
1497                 __u32 dsp;
1498                 struct scsi_cmnd *SCp = hostdata->cmd;
1499                 enum NCR_700_Host_State state;
1500
1501                 handled = 1;
1502                 state = hostdata->state;
1503                 SCp = hostdata->cmd;
1504
1505                 if(istat & SCSI_INT_PENDING) {
1506                         udelay(10);
1507
1508                         sstat0 = NCR_700_readb(host, SSTAT0_REG);
1509                 }
1510
1511                 if(istat & DMA_INT_PENDING) {
1512                         udelay(10);
1513
1514                         dstat = NCR_700_readb(host, DSTAT_REG);
1515                 }
1516
1517                 dsps = NCR_700_readl(host, DSPS_REG);
1518                 dsp = NCR_700_readl(host, DSP_REG);
1519
1520                 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1521                        host->host_no, istat, sstat0, dstat,
1522                        (dsp - (__u32)(hostdata->pScript))/4,
1523                        dsp, dsps));
1524
1525                 if(SCp != NULL) {
1526                         pun = SCp->device->id;
1527                         lun = SCp->device->lun;
1528                 }
1529
1530                 if(sstat0 & SCSI_RESET_DETECTED) {
1531                         struct scsi_device *SDp;
1532                         int i;
1533
1534                         hostdata->state = NCR_700_HOST_BUSY;
1535
1536                         printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1537                                host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1538
1539                         scsi_report_bus_reset(host, 0);
1540
1541                         /* clear all the negotiated parameters */
1542                         __shost_for_each_device(SDp, host)
1543                                 NCR_700_clear_flag(SDp, ~0);
1544                         
1545                         /* clear all the slots and their pending commands */
1546                         for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1547                                 struct scsi_cmnd *SCp;
1548                                 struct NCR_700_command_slot *slot =
1549                                         &hostdata->slots[i];
1550
1551                                 if(slot->state == NCR_700_SLOT_FREE)
1552                                         continue;
1553                                 
1554                                 SCp = slot->cmnd;
1555                                 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1556                                        slot, SCp);
1557                                 free_slot(slot, hostdata);
1558                                 SCp->host_scribble = NULL;
1559                                 NCR_700_set_depth(SCp->device, 0);
1560                                 /* NOTE: deadlock potential here: we
1561                                  * rely on mid-layer guarantees that
1562                                  * scsi_done won't try to issue the
1563                                  * command again otherwise we'll
1564                                  * deadlock on the
1565                                  * hostdata->state_lock */
1566                                 SCp->result = DID_RESET << 16;
1567                                 SCp->scsi_done(SCp);
1568                         }
1569                         mdelay(25);
1570                         NCR_700_chip_setup(host);
1571
1572                         hostdata->state = NCR_700_HOST_FREE;
1573                         hostdata->cmd = NULL;
1574                         /* signal back if this was an eh induced reset */
1575                         if(hostdata->eh_complete != NULL)
1576                                 complete(hostdata->eh_complete);
1577                         goto out_unlock;
1578                 } else if(sstat0 & SELECTION_TIMEOUT) {
1579                         DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1580                                host->host_no, pun, lun));
1581                         NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1582                 } else if(sstat0 & PHASE_MISMATCH) {
1583                         struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1584                                 (struct NCR_700_command_slot *)SCp->host_scribble;
1585
1586                         if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1587                                 /* It wants to reply to some part of
1588                                  * our message */
1589 #ifdef NCR_700_DEBUG
1590                                 __u32 temp = NCR_700_readl(host, TEMP_REG);
1591                                 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1592                                 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)));
1593 #endif
1594                                 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1595                         } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1596                                   dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1597                                 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1598                                 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1599                                 int residual = NCR_700_data_residual(host);
1600                                 int i;
1601 #ifdef NCR_700_DEBUG
1602                                 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1603
1604                                 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1605                                        host->host_no, pun, lun,
1606                                        SGcount, data_transfer);
1607                                 scsi_print_command(SCp);
1608                                 if(residual) {
1609                                         printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1610                                        host->host_no, pun, lun,
1611                                        SGcount, data_transfer, residual);
1612                                 }
1613 #endif
1614                                 data_transfer += residual;
1615
1616                                 if(data_transfer != 0) {
1617                                         int count; 
1618                                         __u32 pAddr;
1619
1620                                         SGcount--;
1621
1622                                         count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1623                                         DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1624                                         slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1625                                         slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1626                                         pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1627                                         pAddr += (count - data_transfer);
1628 #ifdef NCR_700_DEBUG
1629                                         if(pAddr != naddr) {
1630                                                 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);
1631                                         }
1632 #endif
1633                                         slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1634                                 }
1635                                 /* set the executed moves to nops */
1636                                 for(i=0; i<SGcount; i++) {
1637                                         slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1638                                         slot->SG[i].pAddr = 0;
1639                                 }
1640                                 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1641                                 /* and pretend we disconnected after
1642                                  * the command phase */
1643                                 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1644                                 /* make sure all the data is flushed */
1645                                 NCR_700_flush_fifo(host);
1646                         } else {
1647                                 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1648                                 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1649                                        host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1650                                 NCR_700_internal_bus_reset(host);
1651                         }
1652
1653                 } else if(sstat0 & SCSI_GROSS_ERROR) {
1654                         printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1655                                host->host_no, pun, lun);
1656                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1657                 } else if(sstat0 & PARITY_ERROR) {
1658                         printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1659                                host->host_no, pun, lun);
1660                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1661                 } else if(dstat & SCRIPT_INT_RECEIVED) {
1662                         DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1663                                host->host_no, pun, lun));
1664                         resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1665                 } else if(dstat & (ILGL_INST_DETECTED)) {
1666                         printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1667                                "         Please email James.Bottomley@HansenPartnership.com with the details\n",
1668                                host->host_no, pun, lun,
1669                                dsp, dsp - hostdata->pScript);
1670                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1671                 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1672                         printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1673                                host->host_no, pun, lun, dstat);
1674                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1675                 }
1676
1677                 
1678                 /* NOTE: selection interrupt processing MUST occur
1679                  * after script interrupt processing to correctly cope
1680                  * with the case where we process a disconnect and
1681                  * then get reselected before we process the
1682                  * disconnection */
1683                 if(sstat0 & SELECTED) {
1684                         /* FIXME: It currently takes at least FOUR
1685                          * interrupts to complete a command that
1686                          * disconnects: one for the disconnect, one
1687                          * for the reselection, one to get the
1688                          * reselection data and one to complete the
1689                          * command.  If we guess the reselected
1690                          * command here and prepare it, we only need
1691                          * to get a reselection data interrupt if we
1692                          * guessed wrongly.  Since the interrupt
1693                          * overhead is much greater than the command
1694                          * setup, this would be an efficient
1695                          * optimisation particularly as we probably
1696                          * only have one outstanding command on a
1697                          * target most of the time */
1698
1699                         resume_offset = process_selection(host, dsp);
1700
1701                 }
1702
1703         }
1704
1705         if(resume_offset) {
1706                 if(hostdata->state != NCR_700_HOST_BUSY) {
1707                         printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1708                                host->host_no, resume_offset, resume_offset - hostdata->pScript);
1709                         hostdata->state = NCR_700_HOST_BUSY;
1710                 }
1711
1712                 DEBUG(("Attempting to resume at %x\n", resume_offset));
1713                 NCR_700_clear_fifo(host);
1714                 NCR_700_writel(resume_offset, host, DSP_REG);
1715         } 
1716         /* There is probably a technical no-no about this: If we're a
1717          * shared interrupt and we got this interrupt because the
1718          * other device needs servicing not us, we're still going to
1719          * check our queued commands here---of course, there shouldn't
1720          * be any outstanding.... */
1721         if(hostdata->state == NCR_700_HOST_FREE) {
1722                 int i;
1723
1724                 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1725                         /* fairness: always run the queue from the last
1726                          * position we left off */
1727                         int j = (i + hostdata->saved_slot_position)
1728                                 % NCR_700_COMMAND_SLOTS_PER_HOST;
1729                         
1730                         if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1731                                 continue;
1732                         if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1733                                 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1734                                        host->host_no, &hostdata->slots[j],
1735                                        hostdata->slots[j].cmnd));
1736                                 hostdata->saved_slot_position = j + 1;
1737                         }
1738
1739                         break;
1740                 }
1741         }
1742  out_unlock:
1743         spin_unlock_irqrestore(host->host_lock, flags);
1744         return IRQ_RETVAL(handled);
1745 }
1746
1747 STATIC int
1748 NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1749 {
1750         struct NCR_700_Host_Parameters *hostdata = 
1751                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1752         __u32 move_ins;
1753         enum dma_data_direction direction;
1754         struct NCR_700_command_slot *slot;
1755
1756         if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1757                 /* We're over our allocation, this should never happen
1758                  * since we report the max allocation to the mid layer */
1759                 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1760                 return 1;
1761         }
1762         /* check for untagged commands.  We cannot have any outstanding
1763          * commands if we accept them.  Commands could be untagged because:
1764          *
1765          * - The tag negotiated bitmap is clear
1766          * - The blk layer sent and untagged command
1767          */
1768         if(NCR_700_get_depth(SCp->device) != 0
1769            && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1770                || !blk_rq_tagged(SCp->request))) {
1771                 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1772                        NCR_700_get_depth(SCp->device));
1773                 return SCSI_MLQUEUE_DEVICE_BUSY;
1774         }
1775         if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1776                 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1777                        NCR_700_get_depth(SCp->device));
1778                 return SCSI_MLQUEUE_DEVICE_BUSY;
1779         }
1780         NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1781
1782         /* begin the command here */
1783         /* no need to check for NULL, test for command_slot_count above
1784          * ensures a slot is free */
1785         slot = find_empty_slot(hostdata);
1786
1787         slot->cmnd = SCp;
1788
1789         SCp->scsi_done = done;
1790         SCp->host_scribble = (unsigned char *)slot;
1791         SCp->SCp.ptr = NULL;
1792         SCp->SCp.buffer = NULL;
1793
1794 #ifdef NCR_700_DEBUG
1795         printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1796         scsi_print_command(SCp);
1797 #endif
1798         if(blk_rq_tagged(SCp->request)
1799            && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1800            && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1801                 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1802                 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1803                 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1804         }
1805
1806         /* here we may have to process an untagged command.  The gate
1807          * above ensures that this will be the only one outstanding,
1808          * so clear the tag negotiated bit.
1809          *
1810          * FIXME: This will royally screw up on multiple LUN devices
1811          * */
1812         if(!blk_rq_tagged(SCp->request)
1813            && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1814                 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1815                 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1816         }
1817
1818         if((hostdata->tag_negotiated &(1<<scmd_id(SCp)))
1819            && scsi_get_tag_type(SCp->device)) {
1820                 slot->tag = SCp->request->tag;
1821                 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1822                        slot->tag, slot);
1823         } else {
1824                 slot->tag = SCSI_NO_TAG;
1825                 /* must populate current_cmnd for scsi_find_tag to work */
1826                 SCp->device->current_cmnd = SCp;
1827         }
1828         /* sanity check: some of the commands generated by the mid-layer
1829          * have an eccentric idea of their sc_data_direction */
1830         if(!SCp->use_sg && !SCp->request_bufflen 
1831            && SCp->sc_data_direction != DMA_NONE) {
1832 #ifdef NCR_700_DEBUG
1833                 printk("53c700: Command");
1834                 scsi_print_command(SCp);
1835                 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1836 #endif
1837                 SCp->sc_data_direction = DMA_NONE;
1838         }
1839
1840         switch (SCp->cmnd[0]) {
1841         case REQUEST_SENSE:
1842                 /* clear the internal sense magic */
1843                 SCp->cmnd[6] = 0;
1844                 /* fall through */
1845         default:
1846                 /* OK, get it from the command */
1847                 switch(SCp->sc_data_direction) {
1848                 case DMA_BIDIRECTIONAL:
1849                 default:
1850                         printk(KERN_ERR "53c700: Unknown command for data direction ");
1851                         scsi_print_command(SCp);
1852                         
1853                         move_ins = 0;
1854                         break;
1855                 case DMA_NONE:
1856                         move_ins = 0;
1857                         break;
1858                 case DMA_FROM_DEVICE:
1859                         move_ins = SCRIPT_MOVE_DATA_IN;
1860                         break;
1861                 case DMA_TO_DEVICE:
1862                         move_ins = SCRIPT_MOVE_DATA_OUT;
1863                         break;
1864                 }
1865         }
1866
1867         /* now build the scatter gather list */
1868         direction = SCp->sc_data_direction;
1869         if(move_ins != 0) {
1870                 int i;
1871                 int sg_count;
1872                 dma_addr_t vPtr = 0;
1873                 __u32 count = 0;
1874
1875                 if(SCp->use_sg) {
1876                         sg_count = dma_map_sg(hostdata->dev,
1877                                               SCp->request_buffer, SCp->use_sg,
1878                                               direction);
1879                 } else {
1880                         vPtr = dma_map_single(hostdata->dev,
1881                                               SCp->request_buffer, 
1882                                               SCp->request_bufflen,
1883                                               direction);
1884                         count = SCp->request_bufflen;
1885                         slot->dma_handle = vPtr;
1886                         sg_count = 1;
1887                 }
1888                         
1889
1890                 for(i = 0; i < sg_count; i++) {
1891
1892                         if(SCp->use_sg) {
1893                                 struct scatterlist *sg = SCp->request_buffer;
1894
1895                                 vPtr = sg_dma_address(&sg[i]);
1896                                 count = sg_dma_len(&sg[i]);
1897                         }
1898
1899                         slot->SG[i].ins = bS_to_host(move_ins | count);
1900                         DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1901                                i, count, slot->SG[i].ins, (unsigned long)vPtr));
1902                         slot->SG[i].pAddr = bS_to_host(vPtr);
1903                 }
1904                 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1905                 slot->SG[i].pAddr = 0;
1906                 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1907                 DEBUG((" SETTING %08lx to %x\n",
1908                        (&slot->pSG[i].ins),
1909                        slot->SG[i].ins));
1910         }
1911         slot->resume_offset = 0;
1912         slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1913                                     sizeof(SCp->cmnd), DMA_TO_DEVICE);
1914         NCR_700_start_command(SCp);
1915         return 0;
1916 }
1917
1918 STATIC int
1919 NCR_700_abort(struct scsi_cmnd * SCp)
1920 {
1921         struct NCR_700_command_slot *slot;
1922
1923         scmd_printk(KERN_INFO, SCp,
1924                 "New error handler wants to abort command\n\t");
1925         scsi_print_command(SCp);
1926
1927         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1928
1929         if(slot == NULL)
1930                 /* no outstanding command to abort */
1931                 return SUCCESS;
1932         if(SCp->cmnd[0] == TEST_UNIT_READY) {
1933                 /* FIXME: This is because of a problem in the new
1934                  * error handler.  When it is in error recovery, it
1935                  * will send a TUR to a device it thinks may still be
1936                  * showing a problem.  If the TUR isn't responded to,
1937                  * it will abort it and mark the device off line.
1938                  * Unfortunately, it does no other error recovery, so
1939                  * this would leave us with an outstanding command
1940                  * occupying a slot.  Rather than allow this to
1941                  * happen, we issue a bus reset to force all
1942                  * outstanding commands to terminate here. */
1943                 NCR_700_internal_bus_reset(SCp->device->host);
1944                 /* still drop through and return failed */
1945         }
1946         return FAILED;
1947
1948 }
1949
1950 STATIC int
1951 NCR_700_bus_reset(struct scsi_cmnd * SCp)
1952 {
1953         DECLARE_COMPLETION_ONSTACK(complete);
1954         struct NCR_700_Host_Parameters *hostdata = 
1955                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1956
1957         scmd_printk(KERN_INFO, SCp,
1958                 "New error handler wants BUS reset, cmd %p\n\t", SCp);
1959         scsi_print_command(SCp);
1960
1961         /* In theory, eh_complete should always be null because the
1962          * eh is single threaded, but just in case we're handling a
1963          * reset via sg or something */
1964         spin_lock_irq(SCp->device->host->host_lock);
1965         while (hostdata->eh_complete != NULL) {
1966                 spin_unlock_irq(SCp->device->host->host_lock);
1967                 msleep_interruptible(100);
1968                 spin_lock_irq(SCp->device->host->host_lock);
1969         }
1970
1971         hostdata->eh_complete = &complete;
1972         NCR_700_internal_bus_reset(SCp->device->host);
1973
1974         spin_unlock_irq(SCp->device->host->host_lock);
1975         wait_for_completion(&complete);
1976         spin_lock_irq(SCp->device->host->host_lock);
1977
1978         hostdata->eh_complete = NULL;
1979         /* Revalidate the transport parameters of the failing device */
1980         if(hostdata->fast)
1981                 spi_schedule_dv_device(SCp->device);
1982
1983         spin_unlock_irq(SCp->device->host->host_lock);
1984         return SUCCESS;
1985 }
1986
1987 STATIC int
1988 NCR_700_host_reset(struct scsi_cmnd * SCp)
1989 {
1990         scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset\n\t");
1991         scsi_print_command(SCp);
1992
1993         spin_lock_irq(SCp->device->host->host_lock);
1994
1995         NCR_700_internal_bus_reset(SCp->device->host);
1996         NCR_700_chip_reset(SCp->device->host);
1997
1998         spin_unlock_irq(SCp->device->host->host_lock);
1999
2000         return SUCCESS;
2001 }
2002
2003 STATIC void
2004 NCR_700_set_period(struct scsi_target *STp, int period)
2005 {
2006         struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2007         struct NCR_700_Host_Parameters *hostdata = 
2008                 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2009         
2010         if(!hostdata->fast)
2011                 return;
2012
2013         if(period < hostdata->min_period)
2014                 period = hostdata->min_period;
2015
2016         spi_period(STp) = period;
2017         spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2018                             NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2019         spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2020 }
2021
2022 STATIC void
2023 NCR_700_set_offset(struct scsi_target *STp, int offset)
2024 {
2025         struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2026         struct NCR_700_Host_Parameters *hostdata = 
2027                 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2028         int max_offset = hostdata->chip710
2029                 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2030         
2031         if(!hostdata->fast)
2032                 return;
2033
2034         if(offset > max_offset)
2035                 offset = max_offset;
2036
2037         /* if we're currently async, make sure the period is reasonable */
2038         if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2039                                     spi_period(STp) > 0xff))
2040                 spi_period(STp) = hostdata->min_period;
2041
2042         spi_offset(STp) = offset;
2043         spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2044                             NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2045         spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2046 }
2047
2048 STATIC int
2049 NCR_700_slave_alloc(struct scsi_device *SDp)
2050 {
2051         SDp->hostdata = kzalloc(sizeof(struct NCR_700_Device_Parameters),
2052                                 GFP_KERNEL);
2053
2054         if (!SDp->hostdata)
2055                 return -ENOMEM;
2056
2057         return 0;
2058 }
2059
2060 STATIC int
2061 NCR_700_slave_configure(struct scsi_device *SDp)
2062 {
2063         struct NCR_700_Host_Parameters *hostdata = 
2064                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2065
2066         /* to do here: allocate memory; build a queue_full list */
2067         if(SDp->tagged_supported) {
2068                 scsi_set_tag_type(SDp, MSG_ORDERED_TAG);
2069                 scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS);
2070                 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2071         } else {
2072                 /* initialise to default depth */
2073                 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
2074         }
2075         if(hostdata->fast) {
2076                 /* Find the correct offset and period via domain validation */
2077                 if (!spi_initial_dv(SDp->sdev_target))
2078                         spi_dv_device(SDp);
2079         } else {
2080                 spi_offset(SDp->sdev_target) = 0;
2081                 spi_period(SDp->sdev_target) = 0;
2082         }
2083         return 0;
2084 }
2085
2086 STATIC void
2087 NCR_700_slave_destroy(struct scsi_device *SDp)
2088 {
2089         kfree(SDp->hostdata);
2090         SDp->hostdata = NULL;
2091 }
2092
2093 static int
2094 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth)
2095 {
2096         if (depth > NCR_700_MAX_TAGS)
2097                 depth = NCR_700_MAX_TAGS;
2098
2099         scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth);
2100         return depth;
2101 }
2102
2103 static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
2104 {
2105         int change_tag = ((tag_type ==0 &&  scsi_get_tag_type(SDp) != 0)
2106                           || (tag_type != 0 && scsi_get_tag_type(SDp) == 0));
2107         struct NCR_700_Host_Parameters *hostdata = 
2108                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2109
2110         scsi_set_tag_type(SDp, tag_type);
2111
2112         /* We have a global (per target) flag to track whether TCQ is
2113          * enabled, so we'll be turning it off for the entire target here.
2114          * our tag algorithm will fail if we mix tagged and untagged commands,
2115          * so quiesce the device before doing this */
2116         if (change_tag)
2117                 scsi_target_quiesce(SDp->sdev_target);
2118
2119         if (!tag_type) {
2120                 /* shift back to the default unqueued number of commands
2121                  * (the user can still raise this) */
2122                 scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun);
2123                 hostdata->tag_negotiated &= ~(1 << sdev_id(SDp));
2124         } else {
2125                 /* Here, we cleared the negotiation flag above, so this
2126                  * will force the driver to renegotiate */
2127                 scsi_activate_tcq(SDp, SDp->queue_depth);
2128                 if (change_tag)
2129                         NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2130         }
2131         if (change_tag)
2132                 scsi_target_resume(SDp->sdev_target);
2133
2134         return tag_type;
2135 }
2136
2137 static ssize_t
2138 NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
2139 {
2140         struct scsi_device *SDp = to_scsi_device(dev);
2141
2142         return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2143 }
2144
2145 static struct device_attribute NCR_700_active_tags_attr = {
2146         .attr = {
2147                 .name =         "active_tags",
2148                 .mode =         S_IRUGO,
2149         },
2150         .show = NCR_700_show_active_tags,
2151 };
2152
2153 STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2154         &NCR_700_active_tags_attr,
2155         NULL,
2156 };
2157
2158 EXPORT_SYMBOL(NCR_700_detect);
2159 EXPORT_SYMBOL(NCR_700_release);
2160 EXPORT_SYMBOL(NCR_700_intr);
2161
2162 static struct spi_function_template NCR_700_transport_functions =  {
2163         .set_period     = NCR_700_set_period,
2164         .show_period    = 1,
2165         .set_offset     = NCR_700_set_offset,
2166         .show_offset    = 1,
2167 };
2168
2169 static int __init NCR_700_init(void)
2170 {
2171         NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2172         if(!NCR_700_transport_template)
2173                 return -ENODEV;
2174         return 0;
2175 }
2176
2177 static void __exit NCR_700_exit(void)
2178 {
2179         spi_release_transport(NCR_700_transport_template);
2180 }
2181
2182 module_init(NCR_700_init);
2183 module_exit(NCR_700_exit);
2184