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[linux.git] / drivers / scsi / 53c700.c
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1da177e4
LT		 1/* -*- mode: c; c-basic-offset: 8 -*- */
2
3/* NCR (or Symbios) 53c700 and 53c700-66 Driver
4 *
5 * Copyright (C) 2001 by [email protected]
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 <[email protected]> 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/config.h>
118#include <linux/kernel.h>
119#include <linux/types.h>
120#include <linux/string.h>
121#include <linux/ioport.h>
122#include <linux/delay.h>
123#include <linux/spinlock.h>
124#include <linux/completion.h>
125#include <linux/sched.h>
126#include <linux/init.h>
127#include <linux/proc_fs.h>
128#include <linux/blkdev.h>
129#include <linux/module.h>
130#include <linux/interrupt.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
162MODULE_AUTHOR("James Bottomley");
163MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");
164MODULE_LICENSE("GPL");
165
166/* This is the script */
167#include "53c700_d.h"
168
169
170STATIC int NCR_700_queuecommand(struct scsi_cmnd *, void (*done)(struct scsi_cmnd *));
171STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt);
172STATIC int NCR_700_bus_reset(struct scsi_cmnd * SCpnt);
1da177e4
LT		 173STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt);
174STATIC void NCR_700_chip_setup(struct Scsi_Host *host);
175STATIC void NCR_700_chip_reset(struct Scsi_Host *host);
176STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt);
177STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt);
178static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth);
179static int NCR_700_change_queue_type(struct scsi_device *SDpnt, int depth);
180
181STATIC struct device_attribute *NCR_700_dev_attrs[];
182
183STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
184
185static char *NCR_700_phase[] = {
186 "",
187 "after selection",
188 "before command phase",
189 "after command phase",
190 "after status phase",
191 "after data in phase",
192 "after data out phase",
193 "during data phase",
194};
195
196static char *NCR_700_condition[] = {
197 "",
198 "NOT MSG_OUT",
199 "UNEXPECTED PHASE",
200 "NOT MSG_IN",
201 "UNEXPECTED MSG",
202 "MSG_IN",
203 "SDTR_MSG RECEIVED",
204 "REJECT_MSG RECEIVED",
205 "DISCONNECT_MSG RECEIVED",
206 "MSG_OUT",
207 "DATA_IN",
208
209};
210
211static char *NCR_700_fatal_messages[] = {
212 "unexpected message after reselection",
213 "still MSG_OUT after message injection",
214 "not MSG_IN after selection",
215 "Illegal message length received",
216};
217
218static char *NCR_700_SBCL_bits[] = {
219 "IO ",
220 "CD ",
221 "MSG ",
222 "ATN ",
223 "SEL ",
224 "BSY ",
225 "ACK ",
226 "REQ ",
227};
228
229static char *NCR_700_SBCL_to_phase[] = {
230 "DATA_OUT",
231 "DATA_IN",
232 "CMD_OUT",
233 "STATE",
234 "ILLEGAL PHASE",
235 "ILLEGAL PHASE",
236 "MSG OUT",
237 "MSG IN",
238};
239
240static __u8 NCR_700_SDTR_msg[] = {
241 0x01, /* Extended message */
242 0x03, /* Extended message Length */
243 0x01, /* SDTR Extended message */
244 NCR_700_MIN_PERIOD,
245 NCR_700_MAX_OFFSET
246};
247
248/* This translates the SDTR message offset and period to a value
249 * which can be loaded into the SXFER_REG.
250 *
251 * NOTE: According to SCSI-2, the true transfer period (in ns) is
252 * actually four times this period value */
253static inline __u8
254NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
255 __u8 offset, __u8 period)
256{
257 int XFERP;
258
259 __u8 min_xferp = (hostdata->chip710
260 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
261 __u8 max_offset = (hostdata->chip710
262 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
263
264 if(offset == 0)
265 return 0;
266
267 if(period < hostdata->min_period) {
268 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_SDTR_msg[3]*4);
269 period = hostdata->min_period;
270 }
271 XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
272 if(offset > max_offset) {
273 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
274 offset, max_offset);
275 offset = max_offset;
276 }
277 if(XFERP < min_xferp) {
278 printk(KERN_WARNING "53c700: XFERP %d is less than minium, setting to %d\n",
279 XFERP, min_xferp);
280 XFERP = min_xferp;
281 }
282 return (offset & 0x0f) | (XFERP & 0x07)<<4;
283}
284
285static inline __u8
286NCR_700_get_SXFER(struct scsi_device *SDp)
287{
288 struct NCR_700_Host_Parameters *hostdata =
289 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
290
291 return NCR_700_offset_period_to_sxfer(hostdata,
292 spi_offset(SDp->sdev_target),
293 spi_period(SDp->sdev_target));
294}
295
296struct Scsi_Host *
297NCR_700_detect(struct scsi_host_template *tpnt,
298 struct NCR_700_Host_Parameters *hostdata, struct device *dev)
299{
300 dma_addr_t pScript, pSlots;
301 __u8 *memory;
302 __u32 *script;
303 struct Scsi_Host *host;
304 static int banner = 0;
305 int j;
306
307 if(tpnt->sdev_attrs == NULL)
308 tpnt->sdev_attrs = NCR_700_dev_attrs;
309
310 memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
311 &pScript, GFP_KERNEL);
312 if(memory == NULL) {
313 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
314 return NULL;
315 }
316
317 script = (__u32 *)memory;
318 hostdata->msgin = memory + MSGIN_OFFSET;
319 hostdata->msgout = memory + MSGOUT_OFFSET;
320 hostdata->status = memory + STATUS_OFFSET;
321 /* all of these offsets are L1_CACHE_BYTES separated. It is fatal
322 * if this isn't sufficient separation to avoid dma flushing issues */
323 BUG_ON(!dma_is_consistent(pScript) && L1_CACHE_BYTES < dma_get_cache_alignment());
324 hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
325 hostdata->dev = dev;
326
327 pSlots = pScript + SLOTS_OFFSET;
328
329 /* Fill in the missing routines from the host template */
330 tpnt->queuecommand = NCR_700_queuecommand;
331 tpnt->eh_abort_handler = NCR_700_abort;
1da177e4
LT		 332 tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
333 tpnt->eh_host_reset_handler = NCR_700_host_reset;
334 tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
335 tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
336 tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
337 tpnt->use_clustering = ENABLE_CLUSTERING;
338 tpnt->slave_configure = NCR_700_slave_configure;
339 tpnt->slave_destroy = NCR_700_slave_destroy;
340 tpnt->change_queue_depth = NCR_700_change_queue_depth;
341 tpnt->change_queue_type = NCR_700_change_queue_type;
342
343 if(tpnt->name == NULL)
344 tpnt->name = "53c700";
345 if(tpnt->proc_name == NULL)
346 tpnt->proc_name = "53c700";
347
348
349 host = scsi_host_alloc(tpnt, 4);
350 if (!host)
351 return NULL;
352 memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
353 * NCR_700_COMMAND_SLOTS_PER_HOST);
354 for(j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
355 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
356 - (unsigned long)&hostdata->slots[0].SG[0]);
357 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
358 if(j == 0)
359 hostdata->free_list = &hostdata->slots[j];
360 else
361 hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
362 hostdata->slots[j].state = NCR_700_SLOT_FREE;
363 }
364
365 for(j = 0; j < sizeof(SCRIPT)/sizeof(SCRIPT[0]); j++) {
366 script[j] = bS_to_host(SCRIPT[j]);
367 }
368
369 /* adjust all labels to be bus physical */
370 for(j = 0; j < PATCHES; j++) {
371 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
372 }
373 /* now patch up fixed addresses. */
374 script_patch_32(script, MessageLocation,
375 pScript + MSGOUT_OFFSET);
376 script_patch_32(script, StatusAddress,
377 pScript + STATUS_OFFSET);
378 script_patch_32(script, ReceiveMsgAddress,
379 pScript + MSGIN_OFFSET);
380
381 hostdata->script = script;
382 hostdata->pScript = pScript;
383 dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
384 hostdata->state = NCR_700_HOST_FREE;
385 hostdata->cmd = NULL;
386 host->max_id = 7;
387 host->max_lun = NCR_700_MAX_LUNS;
388 BUG_ON(NCR_700_transport_template == NULL);
389 host->transportt = NCR_700_transport_template;
56fece20 390 host->unique_id = (unsigned long)hostdata->base;
1da177e4
LT		 391 hostdata->eh_complete = NULL;
392 host->hostdata[0] = (unsigned long)hostdata;
393 /* kick the chip */
394 NCR_700_writeb(0xff, host, CTEST9_REG);
395 if(hostdata->chip710)
396 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
397 else
398 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
399 hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
400 if(banner == 0) {
401 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By [email protected]\n");
402 banner = 1;
403 }
404 printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
405 hostdata->chip710 ? "53c710" :
406 (hostdata->fast ? "53c700-66" : "53c700"),
407 hostdata->rev, hostdata->differential ?
408 "(Differential)" : "");
409 /* reset the chip */
410 NCR_700_chip_reset(host);
411
412 if (scsi_add_host(host, dev)) {
413 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
414 scsi_host_put(host);
415 return NULL;
416 }
417
418 spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
419 SPI_SIGNAL_SE;
420
421 return host;
422}
423
424int
425NCR_700_release(struct Scsi_Host *host)
426{
427 struct NCR_700_Host_Parameters *hostdata =
428 (struct NCR_700_Host_Parameters *)host->hostdata[0];
429
430 dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
431 hostdata->script, hostdata->pScript);
432 return 1;
433}
434
435static inline __u8
436NCR_700_identify(int can_disconnect, __u8 lun)
437{
438 return IDENTIFY_BASE |
439 ((can_disconnect) ? 0x40 : 0) |
440 (lun & NCR_700_LUN_MASK);
441}
442
443/*
444 * Function : static int data_residual (Scsi_Host *host)
445 *
446 * Purpose : return residual data count of what's in the chip. If you
447 * really want to know what this function is doing, it's almost a
448 * direct transcription of the algorithm described in the 53c710
449 * guide, except that the DBC and DFIFO registers are only 6 bits
450 * wide on a 53c700.
451 *
452 * Inputs : host - SCSI host */
453static inline int
454NCR_700_data_residual (struct Scsi_Host *host) {
455 struct NCR_700_Host_Parameters *hostdata =
456 (struct NCR_700_Host_Parameters *)host->hostdata[0];
457 int count, synchronous = 0;
458 unsigned int ddir;
459
460 if(hostdata->chip710) {
461 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
462 (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
463 } else {
464 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
465 (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
466 }
467
468 if(hostdata->fast)
469 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
470
471 /* get the data direction */
472 ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
473
474 if (ddir) {
475 /* Receive */
476 if (synchronous)
477 count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
478 else
479 if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
480 ++count;
481 } else {
482 /* Send */
483 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
484 if (sstat & SODL_REG_FULL)
485 ++count;
486 if (synchronous && (sstat & SODR_REG_FULL))
487 ++count;
488 }
489#ifdef NCR_700_DEBUG
490 if(count)
491 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
492#endif
493 return count;
494}
495
496/* print out the SCSI wires and corresponding phase from the SBCL register
497 * in the chip */
498static inline char *
499sbcl_to_string(__u8 sbcl)
500{
501 int i;
502 static char ret[256];
503
504 ret[0]='\0';
505 for(i=0; i<8; i++) {
506 if((1<<i) & sbcl)
507 strcat(ret, NCR_700_SBCL_bits[i]);
508 }
509 strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
510 return ret;
511}
512
513static inline __u8
514bitmap_to_number(__u8 bitmap)
515{
516 __u8 i;
517
518 for(i=0; i<8 && !(bitmap &(1<<i)); i++)
519 ;
520 return i;
521}
522
523/* Pull a slot off the free list */
524STATIC struct NCR_700_command_slot *
525find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
526{
527 struct NCR_700_command_slot *slot = hostdata->free_list;
528
529 if(slot == NULL) {
530 /* sanity check */
531 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
532 printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
533 return NULL;
534 }
535
536 if(slot->state != NCR_700_SLOT_FREE)
537 /* should panic! */
538 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
539
540
541 hostdata->free_list = slot->ITL_forw;
542 slot->ITL_forw = NULL;
543
544
545 /* NOTE: set the state to busy here, not queued, since this
546 * indicates the slot is in use and cannot be run by the IRQ
547 * finish routine. If we cannot queue the command when it
548 * is properly build, we then change to NCR_700_SLOT_QUEUED */
549 slot->state = NCR_700_SLOT_BUSY;
550 hostdata->command_slot_count++;
551
552 return slot;
553}
554
555STATIC void
556free_slot(struct NCR_700_command_slot *slot,
557 struct NCR_700_Host_Parameters *hostdata)
558{
559 if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
560 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
561 }
562 if(slot->state == NCR_700_SLOT_FREE) {
563 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
564 }
565
566 slot->resume_offset = 0;
567 slot->cmnd = NULL;
568 slot->state = NCR_700_SLOT_FREE;
569 slot->ITL_forw = hostdata->free_list;
570 hostdata->free_list = slot;
571 hostdata->command_slot_count--;
572}
573
574
575/* This routine really does very little. The command is indexed on
576 the ITL and (if tagged) the ITLQ lists in _queuecommand */
577STATIC void
578save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
579 struct scsi_cmnd *SCp, __u32 dsp)
580{
581 /* Its just possible that this gets executed twice */
582 if(SCp != NULL) {
583 struct NCR_700_command_slot *slot =
584 (struct NCR_700_command_slot *)SCp->host_scribble;
585
586 slot->resume_offset = dsp;
587 }
588 hostdata->state = NCR_700_HOST_FREE;
589 hostdata->cmd = NULL;
590}
591
592STATIC inline void
593NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
594 struct NCR_700_command_slot *slot)
595{
596 if(SCp->sc_data_direction != DMA_NONE &&
597 SCp->sc_data_direction != DMA_BIDIRECTIONAL) {
598 if(SCp->use_sg) {
599 dma_unmap_sg(hostdata->dev, SCp->buffer,
600 SCp->use_sg, SCp->sc_data_direction);
601 } else {
602 dma_unmap_single(hostdata->dev, slot->dma_handle,
603 SCp->request_bufflen,
604 SCp->sc_data_direction);
605 }
606 }
607}
608
609STATIC inline void
610NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
611 struct scsi_cmnd *SCp, int result)
612{
613 hostdata->state = NCR_700_HOST_FREE;
614 hostdata->cmd = NULL;
615
616 if(SCp != NULL) {
617 struct NCR_700_command_slot *slot =
618 (struct NCR_700_command_slot *)SCp->host_scribble;
619
620 NCR_700_unmap(hostdata, SCp, slot);
621 dma_unmap_single(hostdata->dev, slot->pCmd,
622 sizeof(SCp->cmnd), DMA_TO_DEVICE);
623 if(SCp->cmnd[0] == REQUEST_SENSE && SCp->cmnd[6] == NCR_700_INTERNAL_SENSE_MAGIC) {
624#ifdef NCR_700_DEBUG
625 printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
626 SCp, SCp->cmnd[7], result);
627 scsi_print_sense("53c700", SCp);
628
629#endif
630 /* restore the old result if the request sense was
631 * successful */
632 if(result == 0)
633 result = SCp->cmnd[7];
634 /* now restore the original command */
635 memcpy((void *) SCp->cmnd, (void *) SCp->data_cmnd,
636 sizeof(SCp->data_cmnd));
637 SCp->request_buffer = SCp->buffer;
638 SCp->request_bufflen = SCp->bufflen;
639 SCp->use_sg = SCp->old_use_sg;
640 SCp->cmd_len = SCp->old_cmd_len;
641 SCp->sc_data_direction = SCp->sc_old_data_direction;
642 SCp->underflow = SCp->old_underflow;
643
644 }
645 free_slot(slot, hostdata);
646#ifdef NCR_700_DEBUG
647 if(NCR_700_get_depth(SCp->device) == 0 ||
648 NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
649 printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
650 NCR_700_get_depth(SCp->device));
651#endif /* NCR_700_DEBUG */
652 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
653
654 SCp->host_scribble = NULL;
655 SCp->result = result;
656 SCp->scsi_done(SCp);
657 } else {
658 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
659 }
660}
661
662
663STATIC void
664NCR_700_internal_bus_reset(struct Scsi_Host *host)
665{
666 /* Bus reset */
667 NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
668 udelay(50);
669 NCR_700_writeb(0, host, SCNTL1_REG);
670
671}
672
673STATIC void
674NCR_700_chip_setup(struct Scsi_Host *host)
675{
676 struct NCR_700_Host_Parameters *hostdata =
677 (struct NCR_700_Host_Parameters *)host->hostdata[0];
678 __u32 dcntl_extra = 0;
679 __u8 min_period;
680 __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
681
682 if(hostdata->chip710) {
683 __u8 burst_disable = hostdata->burst_disable
684 ? BURST_DISABLE : 0;
685 dcntl_extra = COMPAT_700_MODE;
686
687 NCR_700_writeb(dcntl_extra, host, DCNTL_REG);
688 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
689 host, DMODE_710_REG);
690 NCR_700_writeb(burst_disable | (hostdata->differential ?
691 DIFF : 0), host, CTEST7_REG);
692 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
693 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
694 | AUTO_ATN, host, SCNTL0_REG);
695 } else {
696 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
697 host, DMODE_700_REG);
698 NCR_700_writeb(hostdata->differential ?
699 DIFF : 0, host, CTEST7_REG);
700 if(hostdata->fast) {
701 /* this is for 700-66, does nothing on 700 */
702 NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
703 | GENERATE_RECEIVE_PARITY, host,
704 CTEST8_REG);
705 } else {
706 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
707 | PARITY | AUTO_ATN, host, SCNTL0_REG);
708 }
709 }
710
711 NCR_700_writeb(1 << host->this_id, host, SCID_REG);
712 NCR_700_writeb(0, host, SBCL_REG);
713 NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
714
715 NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
716 | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
717
718 NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
719 NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
720 if(hostdata->clock > 75) {
721 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
722 /* do the best we can, but the async clock will be out
723 * of spec: sync divider 2, async divider 3 */
724 DEBUG(("53c700: sync 2 async 3\n"));
725 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
726 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
727 hostdata->sync_clock = hostdata->clock/2;
728 } else if(hostdata->clock > 50 && hostdata->clock <= 75) {
729 /* sync divider 1.5, async divider 3 */
730 DEBUG(("53c700: sync 1.5 async 3\n"));
731 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
732 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
733 hostdata->sync_clock = hostdata->clock*2;
734 hostdata->sync_clock /= 3;
735
736 } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
737 /* sync divider 1, async divider 2 */
738 DEBUG(("53c700: sync 1 async 2\n"));
739 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
740 NCR_700_writeb(ASYNC_DIV_2_0 | dcntl_extra, host, DCNTL_REG);
741 hostdata->sync_clock = hostdata->clock;
742 } else if(hostdata->clock > 25 && hostdata->clock <=37) {
743 /* sync divider 1, async divider 1.5 */
744 DEBUG(("53c700: sync 1 async 1.5\n"));
745 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
746 NCR_700_writeb(ASYNC_DIV_1_5 | dcntl_extra, host, DCNTL_REG);
747 hostdata->sync_clock = hostdata->clock;
748 } else {
749 DEBUG(("53c700: sync 1 async 1\n"));
750 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
751 NCR_700_writeb(ASYNC_DIV_1_0 | dcntl_extra, host, DCNTL_REG);
752 /* sync divider 1, async divider 1 */
753 hostdata->sync_clock = hostdata->clock;
754 }
755 /* Calculate the actual minimum period that can be supported
756 * by our synchronous clock speed. See the 710 manual for
757 * exact details of this calculation which is based on a
758 * setting of the SXFER register */
759 min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
760 hostdata->min_period = NCR_700_MIN_PERIOD;
761 if(min_period > NCR_700_MIN_PERIOD)
762 hostdata->min_period = min_period;
763}
764
765STATIC void
766NCR_700_chip_reset(struct Scsi_Host *host)
767{
768 struct NCR_700_Host_Parameters *hostdata =
769 (struct NCR_700_Host_Parameters *)host->hostdata[0];
770 if(hostdata->chip710) {
771 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
772 udelay(100);
773
774 NCR_700_writeb(0, host, ISTAT_REG);
775 } else {
776 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
777 udelay(100);
778
779 NCR_700_writeb(0, host, DCNTL_REG);
780 }
781
782 mdelay(1000);
783
784 NCR_700_chip_setup(host);
785}
786
787/* The heart of the message processing engine is that the instruction
788 * immediately after the INT is the normal case (and so must be CLEAR
789 * ACK). If we want to do something else, we call that routine in
790 * scripts and set temp to be the normal case + 8 (skipping the CLEAR
791 * ACK) so that the routine returns correctly to resume its activity
792 * */
793STATIC __u32
794process_extended_message(struct Scsi_Host *host,
795 struct NCR_700_Host_Parameters *hostdata,
796 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
797{
798 __u32 resume_offset = dsp, temp = dsp + 8;
799 __u8 pun = 0xff, lun = 0xff;
800
801 if(SCp != NULL) {
802 pun = SCp->device->id;
803 lun = SCp->device->lun;
804 }
805
806 switch(hostdata->msgin[2]) {
807 case A_SDTR_MSG:
808 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
809 struct scsi_target *starget = SCp->device->sdev_target;
810 __u8 period = hostdata->msgin[3];
811 __u8 offset = hostdata->msgin[4];
812
813 if(offset == 0 || period == 0) {
814 offset = 0;
815 period = 0;
816 }
817
818 spi_offset(starget) = offset;
819 spi_period(starget) = period;
820
821 if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
822 spi_display_xfer_agreement(starget);
823 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
824 }
825
826 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
827 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
828
829 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
830 host, SXFER_REG);
831
832 } else {
833 /* SDTR message out of the blue, reject it */
834 printk(KERN_WARNING "scsi%d Unexpected SDTR msg\n",
835 host->host_no);
836 hostdata->msgout[0] = A_REJECT_MSG;
837 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
838 script_patch_16(hostdata->script, MessageCount, 1);
839 /* SendMsgOut returns, so set up the return
840 * address */
841 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
842 }
843 break;
844
845 case A_WDTR_MSG:
846 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
847 host->host_no, pun, lun);
848 hostdata->msgout[0] = A_REJECT_MSG;
849 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
850 script_patch_16(hostdata->script, MessageCount, 1);
851 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
852
853 break;
854
855 default:
856 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
857 host->host_no, pun, lun,
858 NCR_700_phase[(dsps & 0xf00) >> 8]);
859 scsi_print_msg(hostdata->msgin);
860 printk("\n");
861 /* just reject it */
862 hostdata->msgout[0] = A_REJECT_MSG;
863 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
864 script_patch_16(hostdata->script, MessageCount, 1);
865 /* SendMsgOut returns, so set up the return
866 * address */
867 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
868 }
869 NCR_700_writel(temp, host, TEMP_REG);
870 return resume_offset;
871}
872
873STATIC __u32
874process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
875 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
876{
877 /* work out where to return to */
878 __u32 temp = dsp + 8, resume_offset = dsp;
879 __u8 pun = 0xff, lun = 0xff;
880
881 if(SCp != NULL) {
882 pun = SCp->device->id;
883 lun = SCp->device->lun;
884 }
885
886#ifdef NCR_700_DEBUG
887 printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
888 NCR_700_phase[(dsps & 0xf00) >> 8]);
889 scsi_print_msg(hostdata->msgin);
890 printk("\n");
891#endif
892
893 switch(hostdata->msgin[0]) {
894
895 case A_EXTENDED_MSG:
896 resume_offset = process_extended_message(host, hostdata, SCp,
897 dsp, dsps);
898 break;
899
900 case A_REJECT_MSG:
901 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
902 /* Rejected our sync negotiation attempt */
903 spi_period(SCp->device->sdev_target) =
904 spi_offset(SCp->device->sdev_target) = 0;
905 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
906 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
907 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
908 /* rejected our first simple tag message */
909 printk(KERN_WARNING "scsi%d (%d:%d) Rejected first tag queue attempt, turning off tag queueing\n", host->host_no, pun, lun);
910 /* we're done negotiating */
911 NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
912 hostdata->tag_negotiated &= ~(1<<SCp->device->id);
913 SCp->device->tagged_supported = 0;
914 scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
915 } else {
916 printk(KERN_WARNING "scsi%d (%d:%d) Unexpected REJECT Message %s\n",
917 host->host_no, pun, lun,
918 NCR_700_phase[(dsps & 0xf00) >> 8]);
919 /* however, just ignore it */
920 }
921 break;
922
923 case A_PARITY_ERROR_MSG:
924 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
925 pun, lun);
926 NCR_700_internal_bus_reset(host);
927 break;
928 case A_SIMPLE_TAG_MSG:
929 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
930 pun, lun, hostdata->msgin[1],
931 NCR_700_phase[(dsps & 0xf00) >> 8]);
932 /* just ignore it */
933 break;
934 default:
935 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
936 host->host_no, pun, lun,
937 NCR_700_phase[(dsps & 0xf00) >> 8]);
938
939 scsi_print_msg(hostdata->msgin);
940 printk("\n");
941 /* just reject it */
942 hostdata->msgout[0] = A_REJECT_MSG;
943 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
944 script_patch_16(hostdata->script, MessageCount, 1);
945 /* SendMsgOut returns, so set up the return
946 * address */
947 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
948
949 break;
950 }
951 NCR_700_writel(temp, host, TEMP_REG);
952 /* set us up to receive another message */
953 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
954 return resume_offset;
955}
956
957STATIC __u32
958process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
959 struct Scsi_Host *host,
960 struct NCR_700_Host_Parameters *hostdata)
961{
962 __u32 resume_offset = 0;
963 __u8 pun = 0xff, lun=0xff;
964
965 if(SCp != NULL) {
966 pun = SCp->device->id;
967 lun = SCp->device->lun;
968 }
969
970 if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
971 DEBUG((" COMMAND COMPLETE, status=%02x\n",
972 hostdata->status[0]));
973 /* OK, if TCQ still under negotiation, we now know it works */
974 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
975 NCR_700_set_tag_neg_state(SCp->device,
976 NCR_700_FINISHED_TAG_NEGOTIATION);
977
978 /* check for contingent allegiance contitions */
979 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
980 status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
981 struct NCR_700_command_slot *slot =
982 (struct NCR_700_command_slot *)SCp->host_scribble;
983 if(SCp->cmnd[0] == REQUEST_SENSE) {
984 /* OOPS: bad device, returning another
985 * contingent allegiance condition */
986 printk(KERN_ERR "scsi%d (%d:%d) broken device is looping in contingent allegiance: ignoring\n", host->host_no, pun, lun);
987 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
988 } else {
989#ifdef NCR_DEBUG
990 scsi_print_command(SCp);
991 printk(" cmd %p has status %d, requesting sense\n",
992 SCp, hostdata->status[0]);
993#endif
994 /* we can destroy the command here
995 * because the contingent allegiance
996 * condition will cause a retry which
997 * will re-copy the command from the
998 * saved data_cmnd. We also unmap any
999 * data associated with the command
1000 * here */
1001 NCR_700_unmap(hostdata, SCp, slot);
1002
1003 SCp->cmnd[0] = REQUEST_SENSE;
1004 SCp->cmnd[1] = (SCp->device->lun & 0x7) << 5;
1005 SCp->cmnd[2] = 0;
1006 SCp->cmnd[3] = 0;
1007 SCp->cmnd[4] = sizeof(SCp->sense_buffer);
1008 SCp->cmnd[5] = 0;
1009 SCp->cmd_len = 6;
1010 /* Here's a quiet hack: the
1011 * REQUEST_SENSE command is six bytes,
1012 * so store a flag indicating that
1013 * this was an internal sense request
1014 * and the original status at the end
1015 * of the command */
1016 SCp->cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1017 SCp->cmnd[7] = hostdata->status[0];
1018 SCp->use_sg = 0;
1019 SCp->sc_data_direction = DMA_FROM_DEVICE;
1020 dma_sync_single_for_device(hostdata->dev, slot->pCmd,
1021 SCp->cmd_len, DMA_TO_DEVICE);
1022 SCp->request_bufflen = sizeof(SCp->sense_buffer);
1023 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1024 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | sizeof(SCp->sense_buffer));
1025 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1026 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1027 slot->SG[1].pAddr = 0;
1028 slot->resume_offset = hostdata->pScript;
1029 dma_cache_sync(slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1030 dma_cache_sync(SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1031
1032 /* queue the command for reissue */
1033 slot->state = NCR_700_SLOT_QUEUED;
1034 hostdata->state = NCR_700_HOST_FREE;
1035 hostdata->cmd = NULL;
1036 }
1037 } else {
1038 // Currently rely on the mid layer evaluation
1039 // of the tag queuing capability
1040 //
1041 //if(status_byte(hostdata->status[0]) == GOOD &&
1042 // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1043 // /* Piggy back the tag queueing support
1044 // * on this command */
1045 // dma_sync_single_for_cpu(hostdata->dev,
1046 // slot->dma_handle,
1047 // SCp->request_bufflen,
1048 // DMA_FROM_DEVICE);
1049 // if(((char *)SCp->request_buffer)[7] & 0x02) {
1050 // printk(KERN_INFO "scsi%d: (%d:%d) Enabling Tag Command Queuing\n", host->host_no, pun, lun);
1051 // hostdata->tag_negotiated |= (1<<SCp->device->id);
1052 // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1053 // } else {
1054 // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1055 // hostdata->tag_negotiated &= ~(1<<SCp->device->id);
1056 // }
1057 //}
1058 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1059 }
1060 } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1061 __u8 i = (dsps & 0xf00) >> 8;
1062
1063 printk(KERN_ERR "scsi%d: (%d:%d), UNEXPECTED PHASE %s (%s)\n",
1064 host->host_no, pun, lun,
1065 NCR_700_phase[i],
1066 sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1067 printk(KERN_ERR " len = %d, cmd =", SCp->cmd_len);
1068 scsi_print_command(SCp);
1069
1070 NCR_700_internal_bus_reset(host);
1071 } else if((dsps & 0xfffff000) == A_FATAL) {
1072 int i = (dsps & 0xfff);
1073
1074 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1075 host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1076 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1077 printk(KERN_ERR " msg begins %02x %02x\n",
1078 hostdata->msgin[0], hostdata->msgin[1]);
1079 }
1080 NCR_700_internal_bus_reset(host);
1081 } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1082#ifdef NCR_700_DEBUG
1083 __u8 i = (dsps & 0xf00) >> 8;
1084
1085 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1086 host->host_no, pun, lun,
1087 i, NCR_700_phase[i]);
1088#endif
1089 save_for_reselection(hostdata, SCp, dsp);
1090
1091 } else if(dsps == A_RESELECTION_IDENTIFIED) {
1092 __u8 lun;
1093 struct NCR_700_command_slot *slot;
1094 __u8 reselection_id = hostdata->reselection_id;
1095 struct scsi_device *SDp;
1096
1097 lun = hostdata->msgin[0] & 0x1f;
1098
1099 hostdata->reselection_id = 0xff;
1100 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1101 host->host_no, reselection_id, lun));
1102 /* clear the reselection indicator */
1103 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1104 if(unlikely(SDp == NULL)) {
1105 printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1106 host->host_no, reselection_id, lun);
1107 BUG();
1108 }
1109 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1110 struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1111 if(unlikely(SCp == NULL)) {
1112 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1113 host->host_no, reselection_id, lun, hostdata->msgin[2]);
1114 BUG();
1115 }
1116
1117 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1118 DEBUG(("53c700: %d:%d:%d, reselection is tag %d, slot %p(%d)\n",
1119 host->host_no, SDp->id, SDp->lun,
1120 hostdata->msgin[2], slot, slot->tag));
1121 } else {
1122 struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1123 if(unlikely(SCp == NULL)) {
1124 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for untagged cmd\n",
1125 host->host_no, reselection_id, lun);
1126 BUG();
1127 }
1128 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1129 }
1130
1131 if(slot == NULL) {
1132 printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1133 host->host_no, reselection_id, lun,
1134 hostdata->msgin[0], hostdata->msgin[1],
1135 hostdata->msgin[2]);
1136 } else {
1137 if(hostdata->state != NCR_700_HOST_BUSY)
1138 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1139 host->host_no);
1140 resume_offset = slot->resume_offset;
1141 hostdata->cmd = slot->cmnd;
1142
1143 /* re-patch for this command */
1144 script_patch_32_abs(hostdata->script, CommandAddress,
1145 slot->pCmd);
1146 script_patch_16(hostdata->script,
1147 CommandCount, slot->cmnd->cmd_len);
1148 script_patch_32_abs(hostdata->script, 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->msgin,
1159 MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1160 dma_cache_sync(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(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->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->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 */
1277STATIC inline __u32
1278process_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->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
1358static inline void
1359NCR_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
1369static inline void
1370NCR_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 */
1387STATIC int
1388NCR_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 SCp->device->lun);
1414 /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1415 * if the negotiated transfer parameters still hold, so
1416 * always renegotiate them */
1417 if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE) {
1418 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1419 }
1420
1421 /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1422 * If a contingent allegiance condition exists, the device
1423 * will refuse all tags, so send the request sense as untagged
1424 * */
1425 if((hostdata->tag_negotiated & (1<<SCp->device->id))
1426 && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE)) {
1427 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
1428 }
1429
1430 if(hostdata->fast &&
1431 NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1432 memcpy(&hostdata->msgout[count], NCR_700_SDTR_msg,
1433 sizeof(NCR_700_SDTR_msg));
1434 hostdata->msgout[count+3] = spi_period(SCp->device->sdev_target);
1435 hostdata->msgout[count+4] = spi_offset(SCp->device->sdev_target);
1436 count += sizeof(NCR_700_SDTR_msg);
1437 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1438 }
1439
1440 script_patch_16(hostdata->script, MessageCount, count);
1441
1442
1443 script_patch_ID(hostdata->script,
1444 Device_ID, 1<<SCp->device->id);
1445
1446 script_patch_32_abs(hostdata->script, CommandAddress,
1447 slot->pCmd);
1448 script_patch_16(hostdata->script, CommandCount, SCp->cmd_len);
1449 /* finally plumb the beginning of the SG list into the script
1450 * */
1451 script_patch_32_abs(hostdata->script, SGScriptStartAddress,
1452 to32bit(&slot->pSG[0].ins));
1453 NCR_700_clear_fifo(SCp->device->host);
1454
1455 if(slot->resume_offset == 0)
1456 slot->resume_offset = hostdata->pScript;
1457 /* now perform all the writebacks and invalidates */
1458 dma_cache_sync(hostdata->msgout, count, DMA_TO_DEVICE);
1459 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
1460 DMA_FROM_DEVICE);
1461 dma_cache_sync(SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1462 dma_cache_sync(hostdata->status, 1, DMA_FROM_DEVICE);
1463
1464 /* set the synchronous period/offset */
1465 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1466 SCp->device->host, SXFER_REG);
1467 NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1468 NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1469
1470 return 1;
1471}
1472
1473irqreturn_t
1474NCR_700_intr(int irq, void *dev_id, struct pt_regs *regs)
1475{
1476 struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1477 struct NCR_700_Host_Parameters *hostdata =
1478 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1479 __u8 istat;
1480 __u32 resume_offset = 0;
1481 __u8 pun = 0xff, lun = 0xff;
1482 unsigned long flags;
1483 int handled = 0;
1484
1485 /* Use the host lock to serialise acess to the 53c700
1486 * hardware. Note: In future, we may need to take the queue
1487 * lock to enter the done routines. When that happens, we
1488 * need to ensure that for this driver, the host lock and the
1489 * queue lock point to the same thing. */
1490 spin_lock_irqsave(host->host_lock, flags);
1491 if((istat = NCR_700_readb(host, ISTAT_REG))
1492 & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1493 __u32 dsps;
1494 __u8 sstat0 = 0, dstat = 0;
1495 __u32 dsp;
1496 struct scsi_cmnd *SCp = hostdata->cmd;
1497 enum NCR_700_Host_State state;
1498
1499 handled = 1;
1500 state = hostdata->state;
1501 SCp = hostdata->cmd;
1502
1503 if(istat & SCSI_INT_PENDING) {
1504 udelay(10);
1505
1506 sstat0 = NCR_700_readb(host, SSTAT0_REG);
1507 }
1508
1509 if(istat & DMA_INT_PENDING) {
1510 udelay(10);
1511
1512 dstat = NCR_700_readb(host, DSTAT_REG);
1513 }
1514
1515 dsps = NCR_700_readl(host, DSPS_REG);
1516 dsp = NCR_700_readl(host, DSP_REG);
1517
1518 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1519 host->host_no, istat, sstat0, dstat,
1520 (dsp - (__u32)(hostdata->pScript))/4,
1521 dsp, dsps));
1522
1523 if(SCp != NULL) {
1524 pun = SCp->device->id;
1525 lun = SCp->device->lun;
1526 }
1527
1528 if(sstat0 & SCSI_RESET_DETECTED) {
1529 struct scsi_device *SDp;
1530 int i;
1531
1532 hostdata->state = NCR_700_HOST_BUSY;
1533
1534 printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1535 host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1536
1537 scsi_report_bus_reset(host, 0);
1538
1539 /* clear all the negotiated parameters */
1540 __shost_for_each_device(SDp, host)
1541 SDp->hostdata = NULL;
1542
1543 /* clear all the slots and their pending commands */
1544 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1545 struct scsi_cmnd *SCp;
1546 struct NCR_700_command_slot *slot =
1547 &hostdata->slots[i];
1548
1549 if(slot->state == NCR_700_SLOT_FREE)
1550 continue;
1551
1552 SCp = slot->cmnd;
1553 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1554 slot, SCp);
1555 free_slot(slot, hostdata);
1556 SCp->host_scribble = NULL;
1557 NCR_700_set_depth(SCp->device, 0);
1558 /* NOTE: deadlock potential here: we
1559 * rely on mid-layer guarantees that
1560 * scsi_done won't try to issue the
1561 * command again otherwise we'll
1562 * deadlock on the
1563 * hostdata->state_lock */
1564 SCp->result = DID_RESET << 16;
1565 SCp->scsi_done(SCp);
1566 }
1567 mdelay(25);
1568 NCR_700_chip_setup(host);
1569
1570 hostdata->state = NCR_700_HOST_FREE;
1571 hostdata->cmd = NULL;
1572 /* signal back if this was an eh induced reset */
1573 if(hostdata->eh_complete != NULL)
1574 complete(hostdata->eh_complete);
1575 goto out_unlock;
1576 } else if(sstat0 & SELECTION_TIMEOUT) {
1577 DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1578 host->host_no, pun, lun));
1579 NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1580 } else if(sstat0 & PHASE_MISMATCH) {
1581 struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1582 (struct NCR_700_command_slot *)SCp->host_scribble;
1583
1584 if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1585 /* It wants to reply to some part of
1586 * our message */
1587#ifdef NCR_700_DEBUG
1588 __u32 temp = NCR_700_readl(host, TEMP_REG);
1589 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1590 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)));
1591#endif
1592 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1593 } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1594 dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1595 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1596 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1597 int residual = NCR_700_data_residual(host);
1598 int i;
1599#ifdef NCR_700_DEBUG
1600 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1601
1602 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1603 host->host_no, pun, lun,
1604 SGcount, data_transfer);
1605 scsi_print_command(SCp);
1606 if(residual) {
1607 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1608 host->host_no, pun, lun,
1609 SGcount, data_transfer, residual);
1610 }
1611#endif
1612 data_transfer += residual;
1613
1614 if(data_transfer != 0) {
1615 int count;
1616 __u32 pAddr;
1617
1618 SGcount--;
1619
1620 count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1621 DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1622 slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1623 slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1624 pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1625 pAddr += (count - data_transfer);
1626#ifdef NCR_700_DEBUG
1627 if(pAddr != naddr) {
1628 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);
1629 }
1630#endif
1631 slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1632 }
1633 /* set the executed moves to nops */
1634 for(i=0; i<SGcount; i++) {
1635 slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1636 slot->SG[i].pAddr = 0;
1637 }
1638 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1639 /* and pretend we disconnected after
1640 * the command phase */
1641 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1642 /* make sure all the data is flushed */
1643 NCR_700_flush_fifo(host);
1644 } else {
1645 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1646 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1647 host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1648 NCR_700_internal_bus_reset(host);
1649 }
1650
1651 } else if(sstat0 & SCSI_GROSS_ERROR) {
1652 printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1653 host->host_no, pun, lun);
1654 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1655 } else if(sstat0 & PARITY_ERROR) {
1656 printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1657 host->host_no, pun, lun);
1658 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1659 } else if(dstat & SCRIPT_INT_RECEIVED) {
1660 DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1661 host->host_no, pun, lun));
1662 resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1663 } else if(dstat & (ILGL_INST_DETECTED)) {
1664 printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1665 " Please email [email protected] with the details\n",
1666 host->host_no, pun, lun,
1667 dsp, dsp - hostdata->pScript);
1668 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1669 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1670 printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1671 host->host_no, pun, lun, dstat);
1672 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1673 }
1674
1675
1676 /* NOTE: selection interrupt processing MUST occur
1677 * after script interrupt processing to correctly cope
1678 * with the case where we process a disconnect and
1679 * then get reselected before we process the
1680 * disconnection */
1681 if(sstat0 & SELECTED) {
1682 /* FIXME: It currently takes at least FOUR
1683 * interrupts to complete a command that
1684 * disconnects: one for the disconnect, one
1685 * for the reselection, one to get the
1686 * reselection data and one to complete the
1687 * command. If we guess the reselected
1688 * command here and prepare it, we only need
1689 * to get a reselection data interrupt if we
1690 * guessed wrongly. Since the interrupt
1691 * overhead is much greater than the command
1692 * setup, this would be an efficient
1693 * optimisation particularly as we probably
1694 * only have one outstanding command on a
1695 * target most of the time */
1696
1697 resume_offset = process_selection(host, dsp);
1698
1699 }
1700
1701 }
1702
1703 if(resume_offset) {
1704 if(hostdata->state != NCR_700_HOST_BUSY) {
1705 printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1706 host->host_no, resume_offset, resume_offset - hostdata->pScript);
1707 hostdata->state = NCR_700_HOST_BUSY;
1708 }
1709
1710 DEBUG(("Attempting to resume at %x\n", resume_offset));
1711 NCR_700_clear_fifo(host);
1712 NCR_700_writel(resume_offset, host, DSP_REG);
1713 }
1714 /* There is probably a technical no-no about this: If we're a
1715 * shared interrupt and we got this interrupt because the
1716 * other device needs servicing not us, we're still going to
1717 * check our queued commands here---of course, there shouldn't
1718 * be any outstanding.... */
1719 if(hostdata->state == NCR_700_HOST_FREE) {
1720 int i;
1721
1722 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1723 /* fairness: always run the queue from the last
1724 * position we left off */
1725 int j = (i + hostdata->saved_slot_position)
1726 % NCR_700_COMMAND_SLOTS_PER_HOST;
1727
1728 if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1729 continue;
1730 if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1731 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1732 host->host_no, &hostdata->slots[j],
1733 hostdata->slots[j].cmnd));
1734 hostdata->saved_slot_position = j + 1;
1735 }
1736
1737 break;
1738 }
1739 }
1740 out_unlock:
1741 spin_unlock_irqrestore(host->host_lock, flags);
1742 return IRQ_RETVAL(handled);
1743}
1744
1745STATIC int
1746NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1747{
1748 struct NCR_700_Host_Parameters *hostdata =
1749 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1750 __u32 move_ins;
1751 enum dma_data_direction direction;
1752 struct NCR_700_command_slot *slot;
1753
1754 if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1755 /* We're over our allocation, this should never happen
1756 * since we report the max allocation to the mid layer */
1757 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1758 return 1;
1759 }
1760 /* check for untagged commands. We cannot have any outstanding
1761 * commands if we accept them. Commands could be untagged because:
1762 *
1763 * - The tag negotiated bitmap is clear
1764 * - The blk layer sent and untagged command
1765 */
1766 if(NCR_700_get_depth(SCp->device) != 0
1767 && (!(hostdata->tag_negotiated & (1<<SCp->device->id))
1768 || !blk_rq_tagged(SCp->request))) {
1769 DEBUG((KERN_ERR "scsi%d (%d:%d) has non zero depth %d\n",
1770 SCp->device->host->host_no, SCp->device->id, SCp->device->lun,
1771 NCR_700_get_depth(SCp->device)));
1772 return SCSI_MLQUEUE_DEVICE_BUSY;
1773 }
1774 if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1775 DEBUG((KERN_ERR "scsi%d (%d:%d) has max tag depth %d\n",
1776 SCp->device->host->host_no, SCp->device->id, SCp->device->lun,
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<<SCp->device->id)) == 0
1800 && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1801 printk(KERN_ERR "scsi%d: (%d:%d) Enabling Tag Command Queuing\n", SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
1802 hostdata->tag_negotiated |= (1<<SCp->device->id);
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<<SCp->device->id))) {
1814 printk(KERN_INFO "scsi%d: (%d:%d) Disabling Tag Command Queuing\n", SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
1815 hostdata->tag_negotiated &= ~(1<<SCp->device->id);
1816 }
1817
1818 if((hostdata->tag_negotiated &(1<<SCp->device->id))
1819 && scsi_get_tag_type(SCp->device)) {
1820 slot->tag = SCp->request->tag;
1821 DEBUG(("53c700 %d:%d:%d, sending out tag %d, slot %p\n",
1822 SCp->device->host->host_no, SCp->device->id, SCp->device->lun, slot->tag,
1823 slot));
1824 } else {
1825 slot->tag = SCSI_NO_TAG;
1826 /* must populate current_cmnd for scsi_find_tag to work */
1827 SCp->device->current_cmnd = SCp;
1828 }
1829 /* sanity check: some of the commands generated by the mid-layer
1830 * have an eccentric idea of their sc_data_direction */
1831 if(!SCp->use_sg && !SCp->request_bufflen
1832 && SCp->sc_data_direction != DMA_NONE) {
1833#ifdef NCR_700_DEBUG
1834 printk("53c700: Command");
1835 scsi_print_command(SCp);
1836 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1837#endif
1838 SCp->sc_data_direction = DMA_NONE;
1839 }
1840
1841 switch (SCp->cmnd[0]) {
1842 case REQUEST_SENSE:
1843 /* clear the internal sense magic */
1844 SCp->cmnd[6] = 0;
1845 /* fall through */
1846 default:
1847 /* OK, get it from the command */
1848 switch(SCp->sc_data_direction) {
1849 case DMA_BIDIRECTIONAL:
1850 default:
1851 printk(KERN_ERR "53c700: Unknown command for data direction ");
1852 scsi_print_command(SCp);
1853
1854 move_ins = 0;
1855 break;
1856 case DMA_NONE:
1857 move_ins = 0;
1858 break;
1859 case DMA_FROM_DEVICE:
1860 move_ins = SCRIPT_MOVE_DATA_IN;
1861 break;
1862 case DMA_TO_DEVICE:
1863 move_ins = SCRIPT_MOVE_DATA_OUT;
1864 break;
1865 }
1866 }
1867
1868 /* now build the scatter gather list */
1869 direction = SCp->sc_data_direction;
1870 if(move_ins != 0) {
1871 int i;
1872 int sg_count;
1873 dma_addr_t vPtr = 0;
1874 __u32 count = 0;
1875
1876 if(SCp->use_sg) {
1877 sg_count = dma_map_sg(hostdata->dev, SCp->buffer,
1878 SCp->use_sg, 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->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(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
1918STATIC int
1919NCR_700_abort(struct scsi_cmnd * SCp)
1920{
1921 struct NCR_700_command_slot *slot;
1922
1923 printk(KERN_INFO "scsi%d (%d:%d) New error handler wants to abort command\n\t",
1924 SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
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
1950STATIC int
1951NCR_700_bus_reset(struct scsi_cmnd * SCp)
1952{
1953 DECLARE_COMPLETION(complete);
1954 struct NCR_700_Host_Parameters *hostdata =
1955 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1956
1957 printk(KERN_INFO "scsi%d (%d:%d) New error handler wants BUS reset, cmd %p\n\t",
1958 SCp->device->host->host_no, SCp->device->id, SCp->device->lun, SCp);
1959 scsi_print_command(SCp);
68b3aa7c 1960
1da177e4
LT		 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 */
68b3aa7c
JG		 1964 spin_lock_irq(SCp->device->host->host_lock);
1965 while (hostdata->eh_complete != NULL) {
1da177e4
LT		 1966 spin_unlock_irq(SCp->device->host->host_lock);
1967 msleep_interruptible(100);
1968 spin_lock_irq(SCp->device->host->host_lock);
1969 }
68b3aa7c 1970
1da177e4
LT		 1971 hostdata->eh_complete = &complete;
1972 NCR_700_internal_bus_reset(SCp->device->host);
68b3aa7c 1973
1da177e4
LT		 1974 spin_unlock_irq(SCp->device->host->host_lock);
1975 wait_for_completion(&complete);
1976 spin_lock_irq(SCp->device->host->host_lock);
68b3aa7c 1977
1da177e4
LT		 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);
68b3aa7c
JG		 1982
1983 spin_unlock_irq(SCp->device->host->host_lock);
1da177e4
LT		 1984 return SUCCESS;
1985}
1986
1da177e4
LT		 1987STATIC int
1988NCR_700_host_reset(struct scsi_cmnd * SCp)
1989{
1990 printk(KERN_INFO "scsi%d (%d:%d) New error handler wants HOST reset\n\t",
1991 SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
1992 scsi_print_command(SCp);
1993
df0ae249
JG		 1994 spin_lock_irq(SCp->device->host->host_lock);
1995
1da177e4
LT		 1996 NCR_700_internal_bus_reset(SCp->device->host);
1997 NCR_700_chip_reset(SCp->device->host);
df0ae249
JG		 1998
1999 spin_unlock_irq(SCp->device->host->host_lock);
2000
1da177e4
LT		 2001 return SUCCESS;
2002}
2003
2004STATIC void
2005NCR_700_set_period(struct scsi_target *STp, int period)
2006{
2007 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2008 struct NCR_700_Host_Parameters *hostdata =
2009 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2010
2011 if(!hostdata->fast)
2012 return;
2013
2014 if(period < hostdata->min_period)
2015 period = hostdata->min_period;
2016
2017 spi_period(STp) = period;
2018 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2019 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2020 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2021}
2022
2023STATIC void
2024NCR_700_set_offset(struct scsi_target *STp, int offset)
2025{
2026 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2027 struct NCR_700_Host_Parameters *hostdata =
2028 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2029 int max_offset = hostdata->chip710
2030 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2031
2032 if(!hostdata->fast)
2033 return;
2034
2035 if(offset > max_offset)
2036 offset = max_offset;
2037
2038 /* if we're currently async, make sure the period is reasonable */
2039 if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2040 spi_period(STp) > 0xff))
2041 spi_period(STp) = hostdata->min_period;
2042
2043 spi_offset(STp) = offset;
2044 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2045 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2046 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2047}
2048
2049
2050
2051STATIC int
2052NCR_700_slave_configure(struct scsi_device *SDp)
2053{
2054 struct NCR_700_Host_Parameters *hostdata =
2055 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2056
2057 /* to do here: allocate memory; build a queue_full list */
2058 if(SDp->tagged_supported) {
2059 scsi_set_tag_type(SDp, MSG_ORDERED_TAG);
2060 scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS);
2061 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2062 } else {
2063 /* initialise to default depth */
2064 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
2065 }
2066 if(hostdata->fast) {
2067 /* Find the correct offset and period via domain validation */
2068 if (!spi_initial_dv(SDp->sdev_target))
2069 spi_dv_device(SDp);
2070 } else {
2071 spi_offset(SDp->sdev_target) = 0;
2072 spi_period(SDp->sdev_target) = 0;
2073 }
2074 return 0;
2075}
2076
2077STATIC void
2078NCR_700_slave_destroy(struct scsi_device *SDp)
2079{
2080 /* to do here: deallocate memory */
2081}
2082
2083static int
2084NCR_700_change_queue_depth(struct scsi_device *SDp, int depth)
2085{
2086 if (depth > NCR_700_MAX_TAGS)
2087 depth = NCR_700_MAX_TAGS;
2088
2089 scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth);
2090 return depth;
2091}
2092
2093static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
2094{
2095 int change_tag = ((tag_type ==0 && scsi_get_tag_type(SDp) != 0)
2096 || (tag_type != 0 && scsi_get_tag_type(SDp) == 0));
2097 struct NCR_700_Host_Parameters *hostdata =
2098 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2099
2100 scsi_set_tag_type(SDp, tag_type);
2101
2102 /* We have a global (per target) flag to track whether TCQ is
2103 * enabled, so we'll be turning it off for the entire target here.
2104 * our tag algorithm will fail if we mix tagged and untagged commands,
2105 * so quiesce the device before doing this */
2106 if (change_tag)
2107 scsi_target_quiesce(SDp->sdev_target);
2108
2109 if (!tag_type) {
2110 /* shift back to the default unqueued number of commands
2111 * (the user can still raise this) */
2112 scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun);
2113 hostdata->tag_negotiated &= ~(1 << SDp->id);
2114 } else {
2115 /* Here, we cleared the negotiation flag above, so this
2116 * will force the driver to renegotiate */
2117 scsi_activate_tcq(SDp, SDp->queue_depth);
2118 if (change_tag)
2119 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2120 }
2121 if (change_tag)
2122 scsi_target_resume(SDp->sdev_target);
2123
2124 return tag_type;
2125}
2126
2127static ssize_t
2128NCR_700_show_active_tags(struct device *dev, char *buf)
2129{
2130 struct scsi_device *SDp = to_scsi_device(dev);
2131
2132 return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2133}
2134
2135static struct device_attribute NCR_700_active_tags_attr = {
2136 .attr = {
2137 .name = "active_tags",
2138 .mode = S_IRUGO,
2139 },
2140 .show = NCR_700_show_active_tags,
2141};
2142
2143STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2144 &NCR_700_active_tags_attr,
2145 NULL,
2146};
2147
2148EXPORT_SYMBOL(NCR_700_detect);
2149EXPORT_SYMBOL(NCR_700_release);
2150EXPORT_SYMBOL(NCR_700_intr);
2151
2152static struct spi_function_template NCR_700_transport_functions = {
2153 .set_period = NCR_700_set_period,
2154 .show_period = 1,
2155 .set_offset = NCR_700_set_offset,
2156 .show_offset = 1,
2157};
2158
2159static int __init NCR_700_init(void)
2160{
2161 NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2162 if(!NCR_700_transport_template)
2163 return -ENODEV;
2164 return 0;
2165}
2166
2167static void __exit NCR_700_exit(void)
2168{
2169 spi_release_transport(NCR_700_transport_template);
2170}
2171
2172module_init(NCR_700_init);
2173module_exit(NCR_700_exit);
2174
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