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1/* -*- mode: c; c-basic-offset: 8 -*- */
2
3/* NCR (or Symbios) 53c700 and 53c700-66 Driver
4 *
5 * Copyright (C) 2001 by James.Bottomley@HansenPartnership.com
6**-----------------------------------------------------------------------------
7**
8** This program is free software; you can redistribute it and/or modify
9** it under the terms of the GNU General Public License as published by
10** the Free Software Foundation; either version 2 of the License, or
11** (at your option) any later version.
12**
13** This program is distributed in the hope that it will be useful,
14** but WITHOUT ANY WARRANTY; without even the implied warranty of
15** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16** GNU General Public License for more details.
17**
18** You should have received a copy of the GNU General Public License
19** along with this program; if not, write to the Free Software
20** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21**
22**-----------------------------------------------------------------------------
23 */
24
25/* Notes:
26 *
27 * This driver is designed exclusively for these chips (virtually the
28 * earliest of the scripts engine chips). They need their own drivers
29 * because they are missing so many of the scripts and snazzy register
30 * features of their elder brothers (the 710, 720 and 770).
31 *
32 * The 700 is the lowliest of the line, it can only do async SCSI.
33 * The 700-66 can at least do synchronous SCSI up to 10MHz.
34 *
35 * The 700 chip has no host bus interface logic of its own. However,
36 * it is usually mapped to a location with well defined register
37 * offsets. Therefore, if you can determine the base address and the
38 * irq your board incorporating this chip uses, you can probably use
39 * this driver to run it (although you'll probably have to write a
40 * minimal wrapper for the purpose---see the NCR_D700 driver for
41 * details about how to do this).
42 *
43 *
44 * TODO List:
45 *
46 * 1. Better statistics in the proc fs
47 *
48 * 2. Implement message queue (queues SCSI messages like commands) and make
49 * the abort and device reset functions use them.
50 * */
51
52/* CHANGELOG
53 *
54 * Version 2.8
55 *
56 * Fixed bad bug affecting tag starvation processing (previously the
57 * driver would hang the system if too many tags starved. Also fixed
58 * bad bug having to do with 10 byte command processing and REQUEST
59 * SENSE (the command would loop forever getting a transfer length
60 * mismatch in the CMD phase).
61 *
62 * Version 2.7
63 *
64 * Fixed scripts problem which caused certain devices (notably CDRWs)
65 * to hang on initial INQUIRY. Updated NCR_700_readl/writel to use
66 * __raw_readl/writel for parisc compatibility (Thomas
67 * Bogendoerfer). Added missing SCp->request_bufflen initialisation
68 * for sense requests (Ryan Bradetich).
69 *
70 * Version 2.6
71 *
72 * Following test of the 64 bit parisc kernel by Richard Hirst,
73 * several problems have now been corrected. Also adds support for
74 * consistent memory allocation.
75 *
76 * Version 2.5
77 *
78 * More Compatibility changes for 710 (now actually works). Enhanced
79 * support for odd clock speeds which constrain SDTR negotiations.
80 * correct cacheline separation for scsi messages and status for
81 * incoherent architectures. Use of the pci mapping functions on
82 * buffers to begin support for 64 bit drivers.
83 *
84 * Version 2.4
85 *
86 * Added support for the 53c710 chip (in 53c700 emulation mode only---no
87 * special 53c710 instructions or registers are used).
88 *
89 * Version 2.3
90 *
91 * More endianness/cache coherency changes.
92 *
93 * Better bad device handling (handles devices lying about tag
94 * queueing support and devices which fail to provide sense data on
95 * contingent allegiance conditions)
96 *
97 * Many thanks to Richard Hirst <rhirst@linuxcare.com> for patiently
98 * debugging this driver on the parisc architecture and suggesting
99 * many improvements and bug fixes.
100 *
101 * Thanks also go to Linuxcare Inc. for providing several PARISC
102 * machines for me to debug the driver on.
103 *
104 * Version 2.2
105 *
106 * Made the driver mem or io mapped; added endian invariance; added
107 * dma cache flushing operations for architectures which need it;
108 * added support for more varied clocking speeds.
109 *
110 * Version 2.1
111 *
112 * Initial modularisation from the D700. See NCR_D700.c for the rest of
113 * the changelog.
114 * */
115#define NCR_700_VERSION "2.8"
116
117#include <linux/kernel.h>
118#include <linux/types.h>
119#include <linux/string.h>
120#include <linux/slab.h>
121#include <linux/ioport.h>
122#include <linux/delay.h>
123#include <linux/spinlock.h>
124#include <linux/completion.h>
125#include <linux/init.h>
126#include <linux/proc_fs.h>
127#include <linux/blkdev.h>
128#include <linux/module.h>
129#include <linux/interrupt.h>
130#include <linux/device.h>
131#include <asm/dma.h>
132#include <asm/system.h>
133#include <asm/io.h>
134#include <asm/pgtable.h>
135#include <asm/byteorder.h>
136
137#include <scsi/scsi.h>
138#include <scsi/scsi_cmnd.h>
139#include <scsi/scsi_dbg.h>
140#include <scsi/scsi_eh.h>
141#include <scsi/scsi_host.h>
142#include <scsi/scsi_tcq.h>
143#include <scsi/scsi_transport.h>
144#include <scsi/scsi_transport_spi.h>
145
146#include "53c700.h"
147
148/* NOTE: For 64 bit drivers there are points in the code where we use
149 * a non dereferenceable pointer to point to a structure in dma-able
150 * memory (which is 32 bits) so that we can use all of the structure
151 * operations but take the address at the end. This macro allows us
152 * to truncate the 64 bit pointer down to 32 bits without the compiler
153 * complaining */
154#define to32bit(x) ((__u32)((unsigned long)(x)))
155
156#ifdef NCR_700_DEBUG
157#define STATIC
158#else
159#define STATIC static
160#endif
161
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_Host *h, struct scsi_cmnd *);
171STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt);
172STATIC int NCR_700_bus_reset(struct scsi_cmnd * SCpnt);
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_alloc(struct scsi_device *SDpnt);
177STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt);
178STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt);
179static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth, int reason);
180static int NCR_700_change_queue_type(struct scsi_device *SDpnt, int depth);
181
182STATIC struct device_attribute *NCR_700_dev_attrs[];
183
184STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
185
186static char *NCR_700_phase[] = {
187 "",
188 "after selection",
189 "before command phase",
190 "after command phase",
191 "after status phase",
192 "after data in phase",
193 "after data out phase",
194 "during data phase",
195};
196
197static char *NCR_700_condition[] = {
198 "",
199 "NOT MSG_OUT",
200 "UNEXPECTED PHASE",
201 "NOT MSG_IN",
202 "UNEXPECTED MSG",
203 "MSG_IN",
204 "SDTR_MSG RECEIVED",
205 "REJECT_MSG RECEIVED",
206 "DISCONNECT_MSG RECEIVED",
207 "MSG_OUT",
208 "DATA_IN",
209
210};
211
212static char *NCR_700_fatal_messages[] = {
213 "unexpected message after reselection",
214 "still MSG_OUT after message injection",
215 "not MSG_IN after selection",
216 "Illegal message length received",
217};
218
219static char *NCR_700_SBCL_bits[] = {
220 "IO ",
221 "CD ",
222 "MSG ",
223 "ATN ",
224 "SEL ",
225 "BSY ",
226 "ACK ",
227 "REQ ",
228};
229
230static char *NCR_700_SBCL_to_phase[] = {
231 "DATA_OUT",
232 "DATA_IN",
233 "CMD_OUT",
234 "STATE",
235 "ILLEGAL PHASE",
236 "ILLEGAL PHASE",
237 "MSG OUT",
238 "MSG IN",
239};
240
241/* This translates the SDTR message offset and period to a value
242 * which can be loaded into the SXFER_REG.
243 *
244 * NOTE: According to SCSI-2, the true transfer period (in ns) is
245 * actually four times this period value */
246static inline __u8
247NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
248 __u8 offset, __u8 period)
249{
250 int XFERP;
251
252 __u8 min_xferp = (hostdata->chip710
253 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
254 __u8 max_offset = (hostdata->chip710
255 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
256
257 if(offset == 0)
258 return 0;
259
260 if(period < hostdata->min_period) {
261 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4);
262 period = hostdata->min_period;
263 }
264 XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
265 if(offset > max_offset) {
266 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
267 offset, max_offset);
268 offset = max_offset;
269 }
270 if(XFERP < min_xferp) {
271 XFERP = min_xferp;
272 }
273 return (offset & 0x0f) | (XFERP & 0x07)<<4;
274}
275
276static inline __u8
277NCR_700_get_SXFER(struct scsi_device *SDp)
278{
279 struct NCR_700_Host_Parameters *hostdata =
280 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
281
282 return NCR_700_offset_period_to_sxfer(hostdata,
283 spi_offset(SDp->sdev_target),
284 spi_period(SDp->sdev_target));
285}
286
287struct Scsi_Host *
288NCR_700_detect(struct scsi_host_template *tpnt,
289 struct NCR_700_Host_Parameters *hostdata, struct device *dev)
290{
291 dma_addr_t pScript, pSlots;
292 __u8 *memory;
293 __u32 *script;
294 struct Scsi_Host *host;
295 static int banner = 0;
296 int j;
297
298 if(tpnt->sdev_attrs == NULL)
299 tpnt->sdev_attrs = NCR_700_dev_attrs;
300
301 memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
302 &pScript, GFP_KERNEL);
303 if(memory == NULL) {
304 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
305 return NULL;
306 }
307
308 script = (__u32 *)memory;
309 hostdata->msgin = memory + MSGIN_OFFSET;
310 hostdata->msgout = memory + MSGOUT_OFFSET;
311 hostdata->status = memory + STATUS_OFFSET;
312 hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
313 hostdata->dev = dev;
314
315 pSlots = pScript + SLOTS_OFFSET;
316
317 /* Fill in the missing routines from the host template */
318 tpnt->queuecommand = NCR_700_queuecommand;
319 tpnt->eh_abort_handler = NCR_700_abort;
320 tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
321 tpnt->eh_host_reset_handler = NCR_700_host_reset;
322 tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
323 tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
324 tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
325 tpnt->use_clustering = ENABLE_CLUSTERING;
326 tpnt->slave_configure = NCR_700_slave_configure;
327 tpnt->slave_destroy = NCR_700_slave_destroy;
328 tpnt->slave_alloc = NCR_700_slave_alloc;
329 tpnt->change_queue_depth = NCR_700_change_queue_depth;
330 tpnt->change_queue_type = NCR_700_change_queue_type;
331
332 if(tpnt->name == NULL)
333 tpnt->name = "53c700";
334 if(tpnt->proc_name == NULL)
335 tpnt->proc_name = "53c700";
336
337 host = scsi_host_alloc(tpnt, 4);
338 if (!host)
339 return NULL;
340 memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
341 * NCR_700_COMMAND_SLOTS_PER_HOST);
342 for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
343 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
344 - (unsigned long)&hostdata->slots[0].SG[0]);
345 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
346 if(j == 0)
347 hostdata->free_list = &hostdata->slots[j];
348 else
349 hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
350 hostdata->slots[j].state = NCR_700_SLOT_FREE;
351 }
352
353 for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)
354 script[j] = bS_to_host(SCRIPT[j]);
355
356 /* adjust all labels to be bus physical */
357 for (j = 0; j < PATCHES; j++)
358 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
359 /* now patch up fixed addresses. */
360 script_patch_32(hostdata->dev, script, MessageLocation,
361 pScript + MSGOUT_OFFSET);
362 script_patch_32(hostdata->dev, script, StatusAddress,
363 pScript + STATUS_OFFSET);
364 script_patch_32(hostdata->dev, script, ReceiveMsgAddress,
365 pScript + MSGIN_OFFSET);
366
367 hostdata->script = script;
368 hostdata->pScript = pScript;
369 dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
370 hostdata->state = NCR_700_HOST_FREE;
371 hostdata->cmd = NULL;
372 host->max_id = 8;
373 host->max_lun = NCR_700_MAX_LUNS;
374 BUG_ON(NCR_700_transport_template == NULL);
375 host->transportt = NCR_700_transport_template;
376 host->unique_id = (unsigned long)hostdata->base;
377 hostdata->eh_complete = NULL;
378 host->hostdata[0] = (unsigned long)hostdata;
379 /* kick the chip */
380 NCR_700_writeb(0xff, host, CTEST9_REG);
381 if (hostdata->chip710)
382 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
383 else
384 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
385 hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
386 if (banner == 0) {
387 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
388 banner = 1;
389 }
390 printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
391 hostdata->chip710 ? "53c710" :
392 (hostdata->fast ? "53c700-66" : "53c700"),
393 hostdata->rev, hostdata->differential ?
394 "(Differential)" : "");
395 /* reset the chip */
396 NCR_700_chip_reset(host);
397
398 if (scsi_add_host(host, dev)) {
399 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
400 scsi_host_put(host);
401 return NULL;
402 }
403
404 spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
405 SPI_SIGNAL_SE;
406
407 return host;
408}
409
410int
411NCR_700_release(struct Scsi_Host *host)
412{
413 struct NCR_700_Host_Parameters *hostdata =
414 (struct NCR_700_Host_Parameters *)host->hostdata[0];
415
416 dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
417 hostdata->script, hostdata->pScript);
418 return 1;
419}
420
421static inline __u8
422NCR_700_identify(int can_disconnect, __u8 lun)
423{
424 return IDENTIFY_BASE |
425 ((can_disconnect) ? 0x40 : 0) |
426 (lun & NCR_700_LUN_MASK);
427}
428
429/*
430 * Function : static int data_residual (Scsi_Host *host)
431 *
432 * Purpose : return residual data count of what's in the chip. If you
433 * really want to know what this function is doing, it's almost a
434 * direct transcription of the algorithm described in the 53c710
435 * guide, except that the DBC and DFIFO registers are only 6 bits
436 * wide on a 53c700.
437 *
438 * Inputs : host - SCSI host */
439static inline int
440NCR_700_data_residual (struct Scsi_Host *host) {
441 struct NCR_700_Host_Parameters *hostdata =
442 (struct NCR_700_Host_Parameters *)host->hostdata[0];
443 int count, synchronous = 0;
444 unsigned int ddir;
445
446 if(hostdata->chip710) {
447 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
448 (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
449 } else {
450 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
451 (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
452 }
453
454 if(hostdata->fast)
455 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
456
457 /* get the data direction */
458 ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
459
460 if (ddir) {
461 /* Receive */
462 if (synchronous)
463 count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
464 else
465 if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
466 ++count;
467 } else {
468 /* Send */
469 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
470 if (sstat & SODL_REG_FULL)
471 ++count;
472 if (synchronous && (sstat & SODR_REG_FULL))
473 ++count;
474 }
475#ifdef NCR_700_DEBUG
476 if(count)
477 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
478#endif
479 return count;
480}
481
482/* print out the SCSI wires and corresponding phase from the SBCL register
483 * in the chip */
484static inline char *
485sbcl_to_string(__u8 sbcl)
486{
487 int i;
488 static char ret[256];
489
490 ret[0]='\0';
491 for(i=0; i<8; i++) {
492 if((1<<i) & sbcl)
493 strcat(ret, NCR_700_SBCL_bits[i]);
494 }
495 strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
496 return ret;
497}
498
499static inline __u8
500bitmap_to_number(__u8 bitmap)
501{
502 __u8 i;
503
504 for(i=0; i<8 && !(bitmap &(1<<i)); i++)
505 ;
506 return i;
507}
508
509/* Pull a slot off the free list */
510STATIC struct NCR_700_command_slot *
511find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
512{
513 struct NCR_700_command_slot *slot = hostdata->free_list;
514
515 if(slot == NULL) {
516 /* sanity check */
517 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
518 printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
519 return NULL;
520 }
521
522 if(slot->state != NCR_700_SLOT_FREE)
523 /* should panic! */
524 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
525
526
527 hostdata->free_list = slot->ITL_forw;
528 slot->ITL_forw = NULL;
529
530
531 /* NOTE: set the state to busy here, not queued, since this
532 * indicates the slot is in use and cannot be run by the IRQ
533 * finish routine. If we cannot queue the command when it
534 * is properly build, we then change to NCR_700_SLOT_QUEUED */
535 slot->state = NCR_700_SLOT_BUSY;
536 slot->flags = 0;
537 hostdata->command_slot_count++;
538
539 return slot;
540}
541
542STATIC void
543free_slot(struct NCR_700_command_slot *slot,
544 struct NCR_700_Host_Parameters *hostdata)
545{
546 if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
547 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
548 }
549 if(slot->state == NCR_700_SLOT_FREE) {
550 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
551 }
552
553 slot->resume_offset = 0;
554 slot->cmnd = NULL;
555 slot->state = NCR_700_SLOT_FREE;
556 slot->ITL_forw = hostdata->free_list;
557 hostdata->free_list = slot;
558 hostdata->command_slot_count--;
559}
560
561
562/* This routine really does very little. The command is indexed on
563 the ITL and (if tagged) the ITLQ lists in _queuecommand */
564STATIC void
565save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
566 struct scsi_cmnd *SCp, __u32 dsp)
567{
568 /* Its just possible that this gets executed twice */
569 if(SCp != NULL) {
570 struct NCR_700_command_slot *slot =
571 (struct NCR_700_command_slot *)SCp->host_scribble;
572
573 slot->resume_offset = dsp;
574 }
575 hostdata->state = NCR_700_HOST_FREE;
576 hostdata->cmd = NULL;
577}
578
579STATIC inline void
580NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
581 struct NCR_700_command_slot *slot)
582{
583 if(SCp->sc_data_direction != DMA_NONE &&
584 SCp->sc_data_direction != DMA_BIDIRECTIONAL)
585 scsi_dma_unmap(SCp);
586}
587
588STATIC inline void
589NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
590 struct scsi_cmnd *SCp, int result)
591{
592 hostdata->state = NCR_700_HOST_FREE;
593 hostdata->cmd = NULL;
594
595 if(SCp != NULL) {
596 struct NCR_700_command_slot *slot =
597 (struct NCR_700_command_slot *)SCp->host_scribble;
598
599 dma_unmap_single(hostdata->dev, slot->pCmd,
600 MAX_COMMAND_SIZE, DMA_TO_DEVICE);
601 if (slot->flags == NCR_700_FLAG_AUTOSENSE) {
602 char *cmnd = NCR_700_get_sense_cmnd(SCp->device);
603#ifdef NCR_700_DEBUG
604 printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
605 SCp, SCp->cmnd[7], result);
606 scsi_print_sense("53c700", SCp);
607
608#endif
609 dma_unmap_single(hostdata->dev, slot->dma_handle,
610 SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
611 /* restore the old result if the request sense was
612 * successful */
613 if (result == 0)
614 result = cmnd[7];
615 /* restore the original length */
616 SCp->cmd_len = cmnd[8];
617 } else
618 NCR_700_unmap(hostdata, SCp, slot);
619
620 free_slot(slot, hostdata);
621#ifdef NCR_700_DEBUG
622 if(NCR_700_get_depth(SCp->device) == 0 ||
623 NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
624 printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
625 NCR_700_get_depth(SCp->device));
626#endif /* NCR_700_DEBUG */
627 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
628
629 SCp->host_scribble = NULL;
630 SCp->result = result;
631 SCp->scsi_done(SCp);
632 } else {
633 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
634 }
635}
636
637
638STATIC void
639NCR_700_internal_bus_reset(struct Scsi_Host *host)
640{
641 /* Bus reset */
642 NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
643 udelay(50);
644 NCR_700_writeb(0, host, SCNTL1_REG);
645
646}
647
648STATIC void
649NCR_700_chip_setup(struct Scsi_Host *host)
650{
651 struct NCR_700_Host_Parameters *hostdata =
652 (struct NCR_700_Host_Parameters *)host->hostdata[0];
653 __u8 min_period;
654 __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
655
656 if(hostdata->chip710) {
657 __u8 burst_disable = 0;
658 __u8 burst_length = 0;
659
660 switch (hostdata->burst_length) {
661 case 1:
662 burst_length = BURST_LENGTH_1;
663 break;
664 case 2:
665 burst_length = BURST_LENGTH_2;
666 break;
667 case 4:
668 burst_length = BURST_LENGTH_4;
669 break;
670 case 8:
671 burst_length = BURST_LENGTH_8;
672 break;
673 default:
674 burst_disable = BURST_DISABLE;
675 break;
676 }
677 hostdata->dcntl_extra |= COMPAT_700_MODE;
678
679 NCR_700_writeb(hostdata->dcntl_extra, host, DCNTL_REG);
680 NCR_700_writeb(burst_length | hostdata->dmode_extra,
681 host, DMODE_710_REG);
682 NCR_700_writeb(burst_disable | hostdata->ctest7_extra |
683 (hostdata->differential ? DIFF : 0),
684 host, CTEST7_REG);
685 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
686 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
687 | AUTO_ATN, host, SCNTL0_REG);
688 } else {
689 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
690 host, DMODE_700_REG);
691 NCR_700_writeb(hostdata->differential ?
692 DIFF : 0, host, CTEST7_REG);
693 if(hostdata->fast) {
694 /* this is for 700-66, does nothing on 700 */
695 NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
696 | GENERATE_RECEIVE_PARITY, host,
697 CTEST8_REG);
698 } else {
699 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
700 | PARITY | AUTO_ATN, host, SCNTL0_REG);
701 }
702 }
703
704 NCR_700_writeb(1 << host->this_id, host, SCID_REG);
705 NCR_700_writeb(0, host, SBCL_REG);
706 NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
707
708 NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
709 | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
710
711 NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
712 NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
713 if(hostdata->clock > 75) {
714 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
715 /* do the best we can, but the async clock will be out
716 * of spec: sync divider 2, async divider 3 */
717 DEBUG(("53c700: sync 2 async 3\n"));
718 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
719 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
720 hostdata->sync_clock = hostdata->clock/2;
721 } else if(hostdata->clock > 50 && hostdata->clock <= 75) {
722 /* sync divider 1.5, async divider 3 */
723 DEBUG(("53c700: sync 1.5 async 3\n"));
724 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
725 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
726 hostdata->sync_clock = hostdata->clock*2;
727 hostdata->sync_clock /= 3;
728
729 } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
730 /* sync divider 1, async divider 2 */
731 DEBUG(("53c700: sync 1 async 2\n"));
732 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
733 NCR_700_writeb(ASYNC_DIV_2_0 | hostdata->dcntl_extra, host, DCNTL_REG);
734 hostdata->sync_clock = hostdata->clock;
735 } else if(hostdata->clock > 25 && hostdata->clock <=37) {
736 /* sync divider 1, async divider 1.5 */
737 DEBUG(("53c700: sync 1 async 1.5\n"));
738 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
739 NCR_700_writeb(ASYNC_DIV_1_5 | hostdata->dcntl_extra, host, DCNTL_REG);
740 hostdata->sync_clock = hostdata->clock;
741 } else {
742 DEBUG(("53c700: sync 1 async 1\n"));
743 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
744 NCR_700_writeb(ASYNC_DIV_1_0 | hostdata->dcntl_extra, host, DCNTL_REG);
745 /* sync divider 1, async divider 1 */
746 hostdata->sync_clock = hostdata->clock;
747 }
748 /* Calculate the actual minimum period that can be supported
749 * by our synchronous clock speed. See the 710 manual for
750 * exact details of this calculation which is based on a
751 * setting of the SXFER register */
752 min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
753 hostdata->min_period = NCR_700_MIN_PERIOD;
754 if(min_period > NCR_700_MIN_PERIOD)
755 hostdata->min_period = min_period;
756}
757
758STATIC void
759NCR_700_chip_reset(struct Scsi_Host *host)
760{
761 struct NCR_700_Host_Parameters *hostdata =
762 (struct NCR_700_Host_Parameters *)host->hostdata[0];
763 if(hostdata->chip710) {
764 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
765 udelay(100);
766
767 NCR_700_writeb(0, host, ISTAT_REG);
768 } else {
769 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
770 udelay(100);
771
772 NCR_700_writeb(0, host, DCNTL_REG);
773 }
774
775 mdelay(1000);
776
777 NCR_700_chip_setup(host);
778}
779
780/* The heart of the message processing engine is that the instruction
781 * immediately after the INT is the normal case (and so must be CLEAR
782 * ACK). If we want to do something else, we call that routine in
783 * scripts and set temp to be the normal case + 8 (skipping the CLEAR
784 * ACK) so that the routine returns correctly to resume its activity
785 * */
786STATIC __u32
787process_extended_message(struct Scsi_Host *host,
788 struct NCR_700_Host_Parameters *hostdata,
789 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
790{
791 __u32 resume_offset = dsp, temp = dsp + 8;
792 __u8 pun = 0xff, lun = 0xff;
793
794 if(SCp != NULL) {
795 pun = SCp->device->id;
796 lun = SCp->device->lun;
797 }
798
799 switch(hostdata->msgin[2]) {
800 case A_SDTR_MSG:
801 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
802 struct scsi_target *starget = SCp->device->sdev_target;
803 __u8 period = hostdata->msgin[3];
804 __u8 offset = hostdata->msgin[4];
805
806 if(offset == 0 || period == 0) {
807 offset = 0;
808 period = 0;
809 }
810
811 spi_offset(starget) = offset;
812 spi_period(starget) = period;
813
814 if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
815 spi_display_xfer_agreement(starget);
816 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
817 }
818
819 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
820 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
821
822 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
823 host, SXFER_REG);
824
825 } else {
826 /* SDTR message out of the blue, reject it */
827 shost_printk(KERN_WARNING, host,
828 "Unexpected SDTR msg\n");
829 hostdata->msgout[0] = A_REJECT_MSG;
830 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
831 script_patch_16(hostdata->dev, hostdata->script,
832 MessageCount, 1);
833 /* SendMsgOut returns, so set up the return
834 * address */
835 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
836 }
837 break;
838
839 case A_WDTR_MSG:
840 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
841 host->host_no, pun, lun);
842 hostdata->msgout[0] = A_REJECT_MSG;
843 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
844 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
845 1);
846 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
847
848 break;
849
850 default:
851 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
852 host->host_no, pun, lun,
853 NCR_700_phase[(dsps & 0xf00) >> 8]);
854 spi_print_msg(hostdata->msgin);
855 printk("\n");
856 /* just reject it */
857 hostdata->msgout[0] = A_REJECT_MSG;
858 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
859 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
860 1);
861 /* SendMsgOut returns, so set up the return
862 * address */
863 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
864 }
865 NCR_700_writel(temp, host, TEMP_REG);
866 return resume_offset;
867}
868
869STATIC __u32
870process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
871 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
872{
873 /* work out where to return to */
874 __u32 temp = dsp + 8, resume_offset = dsp;
875 __u8 pun = 0xff, lun = 0xff;
876
877 if(SCp != NULL) {
878 pun = SCp->device->id;
879 lun = SCp->device->lun;
880 }
881
882#ifdef NCR_700_DEBUG
883 printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
884 NCR_700_phase[(dsps & 0xf00) >> 8]);
885 spi_print_msg(hostdata->msgin);
886 printk("\n");
887#endif
888
889 switch(hostdata->msgin[0]) {
890
891 case A_EXTENDED_MSG:
892 resume_offset = process_extended_message(host, hostdata, SCp,
893 dsp, dsps);
894 break;
895
896 case A_REJECT_MSG:
897 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
898 /* Rejected our sync negotiation attempt */
899 spi_period(SCp->device->sdev_target) =
900 spi_offset(SCp->device->sdev_target) = 0;
901 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
902 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
903 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
904 /* rejected our first simple tag message */
905 scmd_printk(KERN_WARNING, SCp,
906 "Rejected first tag queue attempt, turning off tag queueing\n");
907 /* we're done negotiating */
908 NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
909 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
910 SCp->device->tagged_supported = 0;
911 scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
912 } else {
913 shost_printk(KERN_WARNING, host,
914 "(%d:%d) Unexpected REJECT Message %s\n",
915 pun, lun,
916 NCR_700_phase[(dsps & 0xf00) >> 8]);
917 /* however, just ignore it */
918 }
919 break;
920
921 case A_PARITY_ERROR_MSG:
922 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
923 pun, lun);
924 NCR_700_internal_bus_reset(host);
925 break;
926 case A_SIMPLE_TAG_MSG:
927 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
928 pun, lun, hostdata->msgin[1],
929 NCR_700_phase[(dsps & 0xf00) >> 8]);
930 /* just ignore it */
931 break;
932 default:
933 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
934 host->host_no, pun, lun,
935 NCR_700_phase[(dsps & 0xf00) >> 8]);
936
937 spi_print_msg(hostdata->msgin);
938 printk("\n");
939 /* just reject it */
940 hostdata->msgout[0] = A_REJECT_MSG;
941 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
942 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
943 1);
944 /* SendMsgOut returns, so set up the return
945 * address */
946 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
947
948 break;
949 }
950 NCR_700_writel(temp, host, TEMP_REG);
951 /* set us up to receive another message */
952 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
953 return resume_offset;
954}
955
956STATIC __u32
957process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
958 struct Scsi_Host *host,
959 struct NCR_700_Host_Parameters *hostdata)
960{
961 __u32 resume_offset = 0;
962 __u8 pun = 0xff, lun=0xff;
963
964 if(SCp != NULL) {
965 pun = SCp->device->id;
966 lun = SCp->device->lun;
967 }
968
969 if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
970 DEBUG((" COMMAND COMPLETE, status=%02x\n",
971 hostdata->status[0]));
972 /* OK, if TCQ still under negotiation, we now know it works */
973 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
974 NCR_700_set_tag_neg_state(SCp->device,
975 NCR_700_FINISHED_TAG_NEGOTIATION);
976
977 /* check for contingent allegiance contitions */
978 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
979 status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
980 struct NCR_700_command_slot *slot =
981 (struct NCR_700_command_slot *)SCp->host_scribble;
982 if(slot->flags == NCR_700_FLAG_AUTOSENSE) {
983 /* OOPS: bad device, returning another
984 * contingent allegiance condition */
985 scmd_printk(KERN_ERR, SCp,
986 "broken device is looping in contingent allegiance: ignoring\n");
987 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
988 } else {
989 char *cmnd =
990 NCR_700_get_sense_cmnd(SCp->device);
991#ifdef NCR_DEBUG
992 scsi_print_command(SCp);
993 printk(" cmd %p has status %d, requesting sense\n",
994 SCp, hostdata->status[0]);
995#endif
996 /* we can destroy the command here
997 * because the contingent allegiance
998 * condition will cause a retry which
999 * will re-copy the command from the
1000 * saved data_cmnd. We also unmap any
1001 * data associated with the command
1002 * here */
1003 NCR_700_unmap(hostdata, SCp, slot);
1004 dma_unmap_single(hostdata->dev, slot->pCmd,
1005 MAX_COMMAND_SIZE,
1006 DMA_TO_DEVICE);
1007
1008 cmnd[0] = REQUEST_SENSE;
1009 cmnd[1] = (SCp->device->lun & 0x7) << 5;
1010 cmnd[2] = 0;
1011 cmnd[3] = 0;
1012 cmnd[4] = SCSI_SENSE_BUFFERSIZE;
1013 cmnd[5] = 0;
1014 /* Here's a quiet hack: the
1015 * REQUEST_SENSE command is six bytes,
1016 * so store a flag indicating that
1017 * this was an internal sense request
1018 * and the original status at the end
1019 * of the command */
1020 cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1021 cmnd[7] = hostdata->status[0];
1022 cmnd[8] = SCp->cmd_len;
1023 SCp->cmd_len = 6; /* command length for
1024 * REQUEST_SENSE */
1025 slot->pCmd = dma_map_single(hostdata->dev, cmnd, MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1026 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1027 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | SCSI_SENSE_BUFFERSIZE);
1028 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1029 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1030 slot->SG[1].pAddr = 0;
1031 slot->resume_offset = hostdata->pScript;
1032 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1033 dma_cache_sync(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1034
1035 /* queue the command for reissue */
1036 slot->state = NCR_700_SLOT_QUEUED;
1037 slot->flags = NCR_700_FLAG_AUTOSENSE;
1038 hostdata->state = NCR_700_HOST_FREE;
1039 hostdata->cmd = NULL;
1040 }
1041 } else {
1042 // Currently rely on the mid layer evaluation
1043 // of the tag queuing capability
1044 //
1045 //if(status_byte(hostdata->status[0]) == GOOD &&
1046 // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1047 // /* Piggy back the tag queueing support
1048 // * on this command */
1049 // dma_sync_single_for_cpu(hostdata->dev,
1050 // slot->dma_handle,
1051 // SCp->request_bufflen,
1052 // DMA_FROM_DEVICE);
1053 // if(((char *)SCp->request_buffer)[7] & 0x02) {
1054 // scmd_printk(KERN_INFO, SCp,
1055 // "Enabling Tag Command Queuing\n");
1056 // hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1057 // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1058 // } else {
1059 // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1060 // hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1061 // }
1062 //}
1063 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1064 }
1065 } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1066 __u8 i = (dsps & 0xf00) >> 8;
1067
1068 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1069 NCR_700_phase[i],
1070 sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1071 scmd_printk(KERN_ERR, SCp, " len = %d, cmd =",
1072 SCp->cmd_len);
1073 scsi_print_command(SCp);
1074
1075 NCR_700_internal_bus_reset(host);
1076 } else if((dsps & 0xfffff000) == A_FATAL) {
1077 int i = (dsps & 0xfff);
1078
1079 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1080 host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1081 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1082 printk(KERN_ERR " msg begins %02x %02x\n",
1083 hostdata->msgin[0], hostdata->msgin[1]);
1084 }
1085 NCR_700_internal_bus_reset(host);
1086 } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1087#ifdef NCR_700_DEBUG
1088 __u8 i = (dsps & 0xf00) >> 8;
1089
1090 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1091 host->host_no, pun, lun,
1092 i, NCR_700_phase[i]);
1093#endif
1094 save_for_reselection(hostdata, SCp, dsp);
1095
1096 } else if(dsps == A_RESELECTION_IDENTIFIED) {
1097 __u8 lun;
1098 struct NCR_700_command_slot *slot;
1099 __u8 reselection_id = hostdata->reselection_id;
1100 struct scsi_device *SDp;
1101
1102 lun = hostdata->msgin[0] & 0x1f;
1103
1104 hostdata->reselection_id = 0xff;
1105 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1106 host->host_no, reselection_id, lun));
1107 /* clear the reselection indicator */
1108 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1109 if(unlikely(SDp == NULL)) {
1110 printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1111 host->host_no, reselection_id, lun);
1112 BUG();
1113 }
1114 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1115 struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1116 if(unlikely(SCp == NULL)) {
1117 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1118 host->host_no, reselection_id, lun, hostdata->msgin[2]);
1119 BUG();
1120 }
1121
1122 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1123 DDEBUG(KERN_DEBUG, SDp,
1124 "reselection is tag %d, slot %p(%d)\n",
1125 hostdata->msgin[2], slot, slot->tag);
1126 } else {
1127 struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1128 if(unlikely(SCp == NULL)) {
1129 sdev_printk(KERN_ERR, SDp,
1130 "no saved request for untagged cmd\n");
1131 BUG();
1132 }
1133 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1134 }
1135
1136 if(slot == NULL) {
1137 printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1138 host->host_no, reselection_id, lun,
1139 hostdata->msgin[0], hostdata->msgin[1],
1140 hostdata->msgin[2]);
1141 } else {
1142 if(hostdata->state != NCR_700_HOST_BUSY)
1143 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1144 host->host_no);
1145 resume_offset = slot->resume_offset;
1146 hostdata->cmd = slot->cmnd;
1147
1148 /* re-patch for this command */
1149 script_patch_32_abs(hostdata->dev, hostdata->script,
1150 CommandAddress, slot->pCmd);
1151 script_patch_16(hostdata->dev, hostdata->script,
1152 CommandCount, slot->cmnd->cmd_len);
1153 script_patch_32_abs(hostdata->dev, hostdata->script,
1154 SGScriptStartAddress,
1155 to32bit(&slot->pSG[0].ins));
1156
1157 /* Note: setting SXFER only works if we're
1158 * still in the MESSAGE phase, so it is vital
1159 * that ACK is still asserted when we process
1160 * the reselection message. The resume offset
1161 * should therefore always clear ACK */
1162 NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1163 host, SXFER_REG);
1164 dma_cache_sync(hostdata->dev, hostdata->msgin,
1165 MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1166 dma_cache_sync(hostdata->dev, hostdata->msgout,
1167 MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1168 /* I'm just being paranoid here, the command should
1169 * already have been flushed from the cache */
1170 dma_cache_sync(hostdata->dev, slot->cmnd->cmnd,
1171 slot->cmnd->cmd_len, DMA_TO_DEVICE);
1172
1173
1174
1175 }
1176 } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1177
1178 /* This section is full of debugging code because I've
1179 * never managed to reach it. I think what happens is
1180 * that, because the 700 runs with selection
1181 * interrupts enabled the whole time that we take a
1182 * selection interrupt before we manage to get to the
1183 * reselected script interrupt */
1184
1185 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1186 struct NCR_700_command_slot *slot;
1187
1188 /* Take out our own ID */
1189 reselection_id &= ~(1<<host->this_id);
1190
1191 /* I've never seen this happen, so keep this as a printk rather
1192 * than a debug */
1193 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1194 host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1195
1196 {
1197 /* FIXME: DEBUGGING CODE */
1198 __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1199 int i;
1200
1201 for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1202 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1203 && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1204 break;
1205 }
1206 printk(KERN_INFO "IDENTIFIED SG segment as being %08x in slot %p, cmd %p, slot->resume_offset=%08x\n", SG, &hostdata->slots[i], hostdata->slots[i].cmnd, hostdata->slots[i].resume_offset);
1207 SCp = hostdata->slots[i].cmnd;
1208 }
1209
1210 if(SCp != NULL) {
1211 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1212 /* change slot from busy to queued to redo command */
1213 slot->state = NCR_700_SLOT_QUEUED;
1214 }
1215 hostdata->cmd = NULL;
1216
1217 if(reselection_id == 0) {
1218 if(hostdata->reselection_id == 0xff) {
1219 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1220 return 0;
1221 } else {
1222 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1223 host->host_no);
1224 reselection_id = hostdata->reselection_id;
1225 }
1226 } else {
1227
1228 /* convert to real ID */
1229 reselection_id = bitmap_to_number(reselection_id);
1230 }
1231 hostdata->reselection_id = reselection_id;
1232 /* just in case we have a stale simple tag message, clear it */
1233 hostdata->msgin[1] = 0;
1234 dma_cache_sync(hostdata->dev, hostdata->msgin,
1235 MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1236 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1237 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1238 } else {
1239 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1240 }
1241 } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1242 /* we've just disconnected from the bus, do nothing since
1243 * a return here will re-run the queued command slot
1244 * that may have been interrupted by the initial selection */
1245 DEBUG((" SELECTION COMPLETED\n"));
1246 } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1247 resume_offset = process_message(host, hostdata, SCp,
1248 dsp, dsps);
1249 } else if((dsps & 0xfffff000) == 0) {
1250 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1251 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1252 host->host_no, pun, lun, NCR_700_condition[i],
1253 NCR_700_phase[j], dsp - hostdata->pScript);
1254 if(SCp != NULL) {
1255 struct scatterlist *sg;
1256
1257 scsi_print_command(SCp);
1258 scsi_for_each_sg(SCp, sg, scsi_sg_count(SCp) + 1, i) {
1259 printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, sg->length, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].ins, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].pAddr);
1260 }
1261 }
1262 NCR_700_internal_bus_reset(host);
1263 } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1264 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1265 host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1266 resume_offset = dsp;
1267 } else {
1268 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1269 host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1270 NCR_700_internal_bus_reset(host);
1271 }
1272 return resume_offset;
1273}
1274
1275/* We run the 53c700 with selection interrupts always enabled. This
1276 * means that the chip may be selected as soon as the bus frees. On a
1277 * busy bus, this can be before the scripts engine finishes its
1278 * processing. Therefore, part of the selection processing has to be
1279 * to find out what the scripts engine is doing and complete the
1280 * function if necessary (i.e. process the pending disconnect or save
1281 * the interrupted initial selection */
1282STATIC inline __u32
1283process_selection(struct Scsi_Host *host, __u32 dsp)
1284{
1285 __u8 id = 0; /* Squash compiler warning */
1286 int count = 0;
1287 __u32 resume_offset = 0;
1288 struct NCR_700_Host_Parameters *hostdata =
1289 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1290 struct scsi_cmnd *SCp = hostdata->cmd;
1291 __u8 sbcl;
1292
1293 for(count = 0; count < 5; count++) {
1294 id = NCR_700_readb(host, hostdata->chip710 ?
1295 CTEST9_REG : SFBR_REG);
1296
1297 /* Take out our own ID */
1298 id &= ~(1<<host->this_id);
1299 if(id != 0)
1300 break;
1301 udelay(5);
1302 }
1303 sbcl = NCR_700_readb(host, SBCL_REG);
1304 if((sbcl & SBCL_IO) == 0) {
1305 /* mark as having been selected rather than reselected */
1306 id = 0xff;
1307 } else {
1308 /* convert to real ID */
1309 hostdata->reselection_id = id = bitmap_to_number(id);
1310 DEBUG(("scsi%d: Reselected by %d\n",
1311 host->host_no, id));
1312 }
1313 if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1314 struct NCR_700_command_slot *slot =
1315 (struct NCR_700_command_slot *)SCp->host_scribble;
1316 DEBUG((" ID %d WARNING: RESELECTION OF BUSY HOST, saving cmd %p, slot %p, addr %x [%04x], resume %x!\n", id, hostdata->cmd, slot, dsp, dsp - hostdata->pScript, resume_offset));
1317
1318 switch(dsp - hostdata->pScript) {
1319 case Ent_Disconnect1:
1320 case Ent_Disconnect2:
1321 save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1322 break;
1323 case Ent_Disconnect3:
1324 case Ent_Disconnect4:
1325 save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1326 break;
1327 case Ent_Disconnect5:
1328 case Ent_Disconnect6:
1329 save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1330 break;
1331 case Ent_Disconnect7:
1332 case Ent_Disconnect8:
1333 save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1334 break;
1335 case Ent_Finish1:
1336 case Ent_Finish2:
1337 process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1338 break;
1339
1340 default:
1341 slot->state = NCR_700_SLOT_QUEUED;
1342 break;
1343 }
1344 }
1345 hostdata->state = NCR_700_HOST_BUSY;
1346 hostdata->cmd = NULL;
1347 /* clear any stale simple tag message */
1348 hostdata->msgin[1] = 0;
1349 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1350 DMA_BIDIRECTIONAL);
1351
1352 if(id == 0xff) {
1353 /* Selected as target, Ignore */
1354 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1355 } else if(hostdata->tag_negotiated & (1<<id)) {
1356 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1357 } else {
1358 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1359 }
1360 return resume_offset;
1361}
1362
1363static inline void
1364NCR_700_clear_fifo(struct Scsi_Host *host) {
1365 const struct NCR_700_Host_Parameters *hostdata
1366 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1367 if(hostdata->chip710) {
1368 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1369 } else {
1370 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1371 }
1372}
1373
1374static inline void
1375NCR_700_flush_fifo(struct Scsi_Host *host) {
1376 const struct NCR_700_Host_Parameters *hostdata
1377 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1378 if(hostdata->chip710) {
1379 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1380 udelay(10);
1381 NCR_700_writeb(0, host, CTEST8_REG);
1382 } else {
1383 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1384 udelay(10);
1385 NCR_700_writeb(0, host, DFIFO_REG);
1386 }
1387}
1388
1389
1390/* The queue lock with interrupts disabled must be held on entry to
1391 * this function */
1392STATIC int
1393NCR_700_start_command(struct scsi_cmnd *SCp)
1394{
1395 struct NCR_700_command_slot *slot =
1396 (struct NCR_700_command_slot *)SCp->host_scribble;
1397 struct NCR_700_Host_Parameters *hostdata =
1398 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1399 __u16 count = 1; /* for IDENTIFY message */
1400
1401 if(hostdata->state != NCR_700_HOST_FREE) {
1402 /* keep this inside the lock to close the race window where
1403 * the running command finishes on another CPU while we don't
1404 * change the state to queued on this one */
1405 slot->state = NCR_700_SLOT_QUEUED;
1406
1407 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1408 SCp->device->host->host_no, slot->cmnd, slot));
1409 return 0;
1410 }
1411 hostdata->state = NCR_700_HOST_BUSY;
1412 hostdata->cmd = SCp;
1413 slot->state = NCR_700_SLOT_BUSY;
1414 /* keep interrupts disabled until we have the command correctly
1415 * set up so we cannot take a selection interrupt */
1416
1417 hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&
1418 slot->flags != NCR_700_FLAG_AUTOSENSE),
1419 SCp->device->lun);
1420 /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1421 * if the negotiated transfer parameters still hold, so
1422 * always renegotiate them */
1423 if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||
1424 slot->flags == NCR_700_FLAG_AUTOSENSE) {
1425 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1426 }
1427
1428 /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1429 * If a contingent allegiance condition exists, the device
1430 * will refuse all tags, so send the request sense as untagged
1431 * */
1432 if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1433 && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&
1434 slot->flags != NCR_700_FLAG_AUTOSENSE)) {
1435 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
1436 }
1437
1438 if(hostdata->fast &&
1439 NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1440 count += spi_populate_sync_msg(&hostdata->msgout[count],
1441 spi_period(SCp->device->sdev_target),
1442 spi_offset(SCp->device->sdev_target));
1443 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1444 }
1445
1446 script_patch_16(hostdata->dev, hostdata->script, MessageCount, count);
1447
1448
1449 script_patch_ID(hostdata->dev, hostdata->script,
1450 Device_ID, 1<<scmd_id(SCp));
1451
1452 script_patch_32_abs(hostdata->dev, hostdata->script, CommandAddress,
1453 slot->pCmd);
1454 script_patch_16(hostdata->dev, hostdata->script, CommandCount,
1455 SCp->cmd_len);
1456 /* finally plumb the beginning of the SG list into the script
1457 * */
1458 script_patch_32_abs(hostdata->dev, hostdata->script,
1459 SGScriptStartAddress, to32bit(&slot->pSG[0].ins));
1460 NCR_700_clear_fifo(SCp->device->host);
1461
1462 if(slot->resume_offset == 0)
1463 slot->resume_offset = hostdata->pScript;
1464 /* now perform all the writebacks and invalidates */
1465 dma_cache_sync(hostdata->dev, hostdata->msgout, count, DMA_TO_DEVICE);
1466 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1467 DMA_FROM_DEVICE);
1468 dma_cache_sync(hostdata->dev, SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1469 dma_cache_sync(hostdata->dev, hostdata->status, 1, DMA_FROM_DEVICE);
1470
1471 /* set the synchronous period/offset */
1472 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1473 SCp->device->host, SXFER_REG);
1474 NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1475 NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1476
1477 return 1;
1478}
1479
1480irqreturn_t
1481NCR_700_intr(int irq, void *dev_id)
1482{
1483 struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1484 struct NCR_700_Host_Parameters *hostdata =
1485 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1486 __u8 istat;
1487 __u32 resume_offset = 0;
1488 __u8 pun = 0xff, lun = 0xff;
1489 unsigned long flags;
1490 int handled = 0;
1491
1492 /* Use the host lock to serialise access to the 53c700
1493 * hardware. Note: In future, we may need to take the queue
1494 * lock to enter the done routines. When that happens, we
1495 * need to ensure that for this driver, the host lock and the
1496 * queue lock point to the same thing. */
1497 spin_lock_irqsave(host->host_lock, flags);
1498 if((istat = NCR_700_readb(host, ISTAT_REG))
1499 & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1500 __u32 dsps;
1501 __u8 sstat0 = 0, dstat = 0;
1502 __u32 dsp;
1503 struct scsi_cmnd *SCp = hostdata->cmd;
1504 enum NCR_700_Host_State state;
1505
1506 handled = 1;
1507 state = hostdata->state;
1508 SCp = hostdata->cmd;
1509
1510 if(istat & SCSI_INT_PENDING) {
1511 udelay(10);
1512
1513 sstat0 = NCR_700_readb(host, SSTAT0_REG);
1514 }
1515
1516 if(istat & DMA_INT_PENDING) {
1517 udelay(10);
1518
1519 dstat = NCR_700_readb(host, DSTAT_REG);
1520 }
1521
1522 dsps = NCR_700_readl(host, DSPS_REG);
1523 dsp = NCR_700_readl(host, DSP_REG);
1524
1525 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1526 host->host_no, istat, sstat0, dstat,
1527 (dsp - (__u32)(hostdata->pScript))/4,
1528 dsp, dsps));
1529
1530 if(SCp != NULL) {
1531 pun = SCp->device->id;
1532 lun = SCp->device->lun;
1533 }
1534
1535 if(sstat0 & SCSI_RESET_DETECTED) {
1536 struct scsi_device *SDp;
1537 int i;
1538
1539 hostdata->state = NCR_700_HOST_BUSY;
1540
1541 printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1542 host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1543
1544 scsi_report_bus_reset(host, 0);
1545
1546 /* clear all the negotiated parameters */
1547 __shost_for_each_device(SDp, host)
1548 NCR_700_clear_flag(SDp, ~0);
1549
1550 /* clear all the slots and their pending commands */
1551 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1552 struct scsi_cmnd *SCp;
1553 struct NCR_700_command_slot *slot =
1554 &hostdata->slots[i];
1555
1556 if(slot->state == NCR_700_SLOT_FREE)
1557 continue;
1558
1559 SCp = slot->cmnd;
1560 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1561 slot, SCp);
1562 free_slot(slot, hostdata);
1563 SCp->host_scribble = NULL;
1564 NCR_700_set_depth(SCp->device, 0);
1565 /* NOTE: deadlock potential here: we
1566 * rely on mid-layer guarantees that
1567 * scsi_done won't try to issue the
1568 * command again otherwise we'll
1569 * deadlock on the
1570 * hostdata->state_lock */
1571 SCp->result = DID_RESET << 16;
1572 SCp->scsi_done(SCp);
1573 }
1574 mdelay(25);
1575 NCR_700_chip_setup(host);
1576
1577 hostdata->state = NCR_700_HOST_FREE;
1578 hostdata->cmd = NULL;
1579 /* signal back if this was an eh induced reset */
1580 if(hostdata->eh_complete != NULL)
1581 complete(hostdata->eh_complete);
1582 goto out_unlock;
1583 } else if(sstat0 & SELECTION_TIMEOUT) {
1584 DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1585 host->host_no, pun, lun));
1586 NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1587 } else if(sstat0 & PHASE_MISMATCH) {
1588 struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1589 (struct NCR_700_command_slot *)SCp->host_scribble;
1590
1591 if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1592 /* It wants to reply to some part of
1593 * our message */
1594#ifdef NCR_700_DEBUG
1595 __u32 temp = NCR_700_readl(host, TEMP_REG);
1596 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1597 printk("scsi%d (%d:%d) PHASE MISMATCH IN SEND MESSAGE %d remain, return %p[%04x], phase %s\n", host->host_no, pun, lun, count, (void *)temp, temp - hostdata->pScript, sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1598#endif
1599 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1600 } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1601 dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1602 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1603 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1604 int residual = NCR_700_data_residual(host);
1605 int i;
1606#ifdef NCR_700_DEBUG
1607 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1608
1609 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1610 host->host_no, pun, lun,
1611 SGcount, data_transfer);
1612 scsi_print_command(SCp);
1613 if(residual) {
1614 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1615 host->host_no, pun, lun,
1616 SGcount, data_transfer, residual);
1617 }
1618#endif
1619 data_transfer += residual;
1620
1621 if(data_transfer != 0) {
1622 int count;
1623 __u32 pAddr;
1624
1625 SGcount--;
1626
1627 count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1628 DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1629 slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1630 slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1631 pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1632 pAddr += (count - data_transfer);
1633#ifdef NCR_700_DEBUG
1634 if(pAddr != naddr) {
1635 printk("scsi%d (%d:%d) transfer mismatch pAddr=%lx, naddr=%lx, data_transfer=%d, residual=%d\n", host->host_no, pun, lun, (unsigned long)pAddr, (unsigned long)naddr, data_transfer, residual);
1636 }
1637#endif
1638 slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1639 }
1640 /* set the executed moves to nops */
1641 for(i=0; i<SGcount; i++) {
1642 slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1643 slot->SG[i].pAddr = 0;
1644 }
1645 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1646 /* and pretend we disconnected after
1647 * the command phase */
1648 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1649 /* make sure all the data is flushed */
1650 NCR_700_flush_fifo(host);
1651 } else {
1652 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1653 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1654 host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1655 NCR_700_internal_bus_reset(host);
1656 }
1657
1658 } else if(sstat0 & SCSI_GROSS_ERROR) {
1659 printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1660 host->host_no, pun, lun);
1661 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1662 } else if(sstat0 & PARITY_ERROR) {
1663 printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1664 host->host_no, pun, lun);
1665 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1666 } else if(dstat & SCRIPT_INT_RECEIVED) {
1667 DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1668 host->host_no, pun, lun));
1669 resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1670 } else if(dstat & (ILGL_INST_DETECTED)) {
1671 printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1672 " Please email James.Bottomley@HansenPartnership.com with the details\n",
1673 host->host_no, pun, lun,
1674 dsp, dsp - hostdata->pScript);
1675 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1676 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1677 printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1678 host->host_no, pun, lun, dstat);
1679 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1680 }
1681
1682
1683 /* NOTE: selection interrupt processing MUST occur
1684 * after script interrupt processing to correctly cope
1685 * with the case where we process a disconnect and
1686 * then get reselected before we process the
1687 * disconnection */
1688 if(sstat0 & SELECTED) {
1689 /* FIXME: It currently takes at least FOUR
1690 * interrupts to complete a command that
1691 * disconnects: one for the disconnect, one
1692 * for the reselection, one to get the
1693 * reselection data and one to complete the
1694 * command. If we guess the reselected
1695 * command here and prepare it, we only need
1696 * to get a reselection data interrupt if we
1697 * guessed wrongly. Since the interrupt
1698 * overhead is much greater than the command
1699 * setup, this would be an efficient
1700 * optimisation particularly as we probably
1701 * only have one outstanding command on a
1702 * target most of the time */
1703
1704 resume_offset = process_selection(host, dsp);
1705
1706 }
1707
1708 }
1709
1710 if(resume_offset) {
1711 if(hostdata->state != NCR_700_HOST_BUSY) {
1712 printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1713 host->host_no, resume_offset, resume_offset - hostdata->pScript);
1714 hostdata->state = NCR_700_HOST_BUSY;
1715 }
1716
1717 DEBUG(("Attempting to resume at %x\n", resume_offset));
1718 NCR_700_clear_fifo(host);
1719 NCR_700_writel(resume_offset, host, DSP_REG);
1720 }
1721 /* There is probably a technical no-no about this: If we're a
1722 * shared interrupt and we got this interrupt because the
1723 * other device needs servicing not us, we're still going to
1724 * check our queued commands here---of course, there shouldn't
1725 * be any outstanding.... */
1726 if(hostdata->state == NCR_700_HOST_FREE) {
1727 int i;
1728
1729 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1730 /* fairness: always run the queue from the last
1731 * position we left off */
1732 int j = (i + hostdata->saved_slot_position)
1733 % NCR_700_COMMAND_SLOTS_PER_HOST;
1734
1735 if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1736 continue;
1737 if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1738 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1739 host->host_no, &hostdata->slots[j],
1740 hostdata->slots[j].cmnd));
1741 hostdata->saved_slot_position = j + 1;
1742 }
1743
1744 break;
1745 }
1746 }
1747 out_unlock:
1748 spin_unlock_irqrestore(host->host_lock, flags);
1749 return IRQ_RETVAL(handled);
1750}
1751
1752static int
1753NCR_700_queuecommand_lck(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1754{
1755 struct NCR_700_Host_Parameters *hostdata =
1756 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1757 __u32 move_ins;
1758 enum dma_data_direction direction;
1759 struct NCR_700_command_slot *slot;
1760
1761 if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1762 /* We're over our allocation, this should never happen
1763 * since we report the max allocation to the mid layer */
1764 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1765 return 1;
1766 }
1767 /* check for untagged commands. We cannot have any outstanding
1768 * commands if we accept them. Commands could be untagged because:
1769 *
1770 * - The tag negotiated bitmap is clear
1771 * - The blk layer sent and untagged command
1772 */
1773 if(NCR_700_get_depth(SCp->device) != 0
1774 && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1775 || !blk_rq_tagged(SCp->request))) {
1776 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1777 NCR_700_get_depth(SCp->device));
1778 return SCSI_MLQUEUE_DEVICE_BUSY;
1779 }
1780 if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1781 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1782 NCR_700_get_depth(SCp->device));
1783 return SCSI_MLQUEUE_DEVICE_BUSY;
1784 }
1785 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1786
1787 /* begin the command here */
1788 /* no need to check for NULL, test for command_slot_count above
1789 * ensures a slot is free */
1790 slot = find_empty_slot(hostdata);
1791
1792 slot->cmnd = SCp;
1793
1794 SCp->scsi_done = done;
1795 SCp->host_scribble = (unsigned char *)slot;
1796 SCp->SCp.ptr = NULL;
1797 SCp->SCp.buffer = NULL;
1798
1799#ifdef NCR_700_DEBUG
1800 printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1801 scsi_print_command(SCp);
1802#endif
1803 if(blk_rq_tagged(SCp->request)
1804 && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1805 && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1806 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1807 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1808 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1809 }
1810
1811 /* here we may have to process an untagged command. The gate
1812 * above ensures that this will be the only one outstanding,
1813 * so clear the tag negotiated bit.
1814 *
1815 * FIXME: This will royally screw up on multiple LUN devices
1816 * */
1817 if(!blk_rq_tagged(SCp->request)
1818 && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1819 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1820 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1821 }
1822
1823 if((hostdata->tag_negotiated &(1<<scmd_id(SCp)))
1824 && scsi_get_tag_type(SCp->device)) {
1825 slot->tag = SCp->request->tag;
1826 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1827 slot->tag, slot);
1828 } else {
1829 slot->tag = SCSI_NO_TAG;
1830 /* must populate current_cmnd for scsi_find_tag to work */
1831 SCp->device->current_cmnd = SCp;
1832 }
1833 /* sanity check: some of the commands generated by the mid-layer
1834 * have an eccentric idea of their sc_data_direction */
1835 if(!scsi_sg_count(SCp) && !scsi_bufflen(SCp) &&
1836 SCp->sc_data_direction != DMA_NONE) {
1837#ifdef NCR_700_DEBUG
1838 printk("53c700: Command");
1839 scsi_print_command(SCp);
1840 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1841#endif
1842 SCp->sc_data_direction = DMA_NONE;
1843 }
1844
1845 switch (SCp->cmnd[0]) {
1846 case REQUEST_SENSE:
1847 /* clear the internal sense magic */
1848 SCp->cmnd[6] = 0;
1849 /* fall through */
1850 default:
1851 /* OK, get it from the command */
1852 switch(SCp->sc_data_direction) {
1853 case DMA_BIDIRECTIONAL:
1854 default:
1855 printk(KERN_ERR "53c700: Unknown command for data direction ");
1856 scsi_print_command(SCp);
1857
1858 move_ins = 0;
1859 break;
1860 case DMA_NONE:
1861 move_ins = 0;
1862 break;
1863 case DMA_FROM_DEVICE:
1864 move_ins = SCRIPT_MOVE_DATA_IN;
1865 break;
1866 case DMA_TO_DEVICE:
1867 move_ins = SCRIPT_MOVE_DATA_OUT;
1868 break;
1869 }
1870 }
1871
1872 /* now build the scatter gather list */
1873 direction = SCp->sc_data_direction;
1874 if(move_ins != 0) {
1875 int i;
1876 int sg_count;
1877 dma_addr_t vPtr = 0;
1878 struct scatterlist *sg;
1879 __u32 count = 0;
1880
1881 sg_count = scsi_dma_map(SCp);
1882 BUG_ON(sg_count < 0);
1883
1884 scsi_for_each_sg(SCp, sg, sg_count, i) {
1885 vPtr = sg_dma_address(sg);
1886 count = sg_dma_len(sg);
1887
1888 slot->SG[i].ins = bS_to_host(move_ins | count);
1889 DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1890 i, count, slot->SG[i].ins, (unsigned long)vPtr));
1891 slot->SG[i].pAddr = bS_to_host(vPtr);
1892 }
1893 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1894 slot->SG[i].pAddr = 0;
1895 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1896 DEBUG((" SETTING %08lx to %x\n",
1897 (&slot->pSG[i].ins),
1898 slot->SG[i].ins));
1899 }
1900 slot->resume_offset = 0;
1901 slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1902 MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1903 NCR_700_start_command(SCp);
1904 return 0;
1905}
1906
1907STATIC DEF_SCSI_QCMD(NCR_700_queuecommand)
1908
1909STATIC int
1910NCR_700_abort(struct scsi_cmnd * SCp)
1911{
1912 struct NCR_700_command_slot *slot;
1913
1914 scmd_printk(KERN_INFO, SCp,
1915 "New error handler wants to abort command\n\t");
1916 scsi_print_command(SCp);
1917
1918 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1919
1920 if(slot == NULL)
1921 /* no outstanding command to abort */
1922 return SUCCESS;
1923 if(SCp->cmnd[0] == TEST_UNIT_READY) {
1924 /* FIXME: This is because of a problem in the new
1925 * error handler. When it is in error recovery, it
1926 * will send a TUR to a device it thinks may still be
1927 * showing a problem. If the TUR isn't responded to,
1928 * it will abort it and mark the device off line.
1929 * Unfortunately, it does no other error recovery, so
1930 * this would leave us with an outstanding command
1931 * occupying a slot. Rather than allow this to
1932 * happen, we issue a bus reset to force all
1933 * outstanding commands to terminate here. */
1934 NCR_700_internal_bus_reset(SCp->device->host);
1935 /* still drop through and return failed */
1936 }
1937 return FAILED;
1938
1939}
1940
1941STATIC int
1942NCR_700_bus_reset(struct scsi_cmnd * SCp)
1943{
1944 DECLARE_COMPLETION_ONSTACK(complete);
1945 struct NCR_700_Host_Parameters *hostdata =
1946 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1947
1948 scmd_printk(KERN_INFO, SCp,
1949 "New error handler wants BUS reset, cmd %p\n\t", SCp);
1950 scsi_print_command(SCp);
1951
1952 /* In theory, eh_complete should always be null because the
1953 * eh is single threaded, but just in case we're handling a
1954 * reset via sg or something */
1955 spin_lock_irq(SCp->device->host->host_lock);
1956 while (hostdata->eh_complete != NULL) {
1957 spin_unlock_irq(SCp->device->host->host_lock);
1958 msleep_interruptible(100);
1959 spin_lock_irq(SCp->device->host->host_lock);
1960 }
1961
1962 hostdata->eh_complete = &complete;
1963 NCR_700_internal_bus_reset(SCp->device->host);
1964
1965 spin_unlock_irq(SCp->device->host->host_lock);
1966 wait_for_completion(&complete);
1967 spin_lock_irq(SCp->device->host->host_lock);
1968
1969 hostdata->eh_complete = NULL;
1970 /* Revalidate the transport parameters of the failing device */
1971 if(hostdata->fast)
1972 spi_schedule_dv_device(SCp->device);
1973
1974 spin_unlock_irq(SCp->device->host->host_lock);
1975 return SUCCESS;
1976}
1977
1978STATIC int
1979NCR_700_host_reset(struct scsi_cmnd * SCp)
1980{
1981 scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset\n\t");
1982 scsi_print_command(SCp);
1983
1984 spin_lock_irq(SCp->device->host->host_lock);
1985
1986 NCR_700_internal_bus_reset(SCp->device->host);
1987 NCR_700_chip_reset(SCp->device->host);
1988
1989 spin_unlock_irq(SCp->device->host->host_lock);
1990
1991 return SUCCESS;
1992}
1993
1994STATIC void
1995NCR_700_set_period(struct scsi_target *STp, int period)
1996{
1997 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
1998 struct NCR_700_Host_Parameters *hostdata =
1999 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2000
2001 if(!hostdata->fast)
2002 return;
2003
2004 if(period < hostdata->min_period)
2005 period = hostdata->min_period;
2006
2007 spi_period(STp) = period;
2008 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2009 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2010 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2011}
2012
2013STATIC void
2014NCR_700_set_offset(struct scsi_target *STp, int offset)
2015{
2016 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2017 struct NCR_700_Host_Parameters *hostdata =
2018 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2019 int max_offset = hostdata->chip710
2020 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2021
2022 if(!hostdata->fast)
2023 return;
2024
2025 if(offset > max_offset)
2026 offset = max_offset;
2027
2028 /* if we're currently async, make sure the period is reasonable */
2029 if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2030 spi_period(STp) > 0xff))
2031 spi_period(STp) = hostdata->min_period;
2032
2033 spi_offset(STp) = offset;
2034 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2035 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2036 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2037}
2038
2039STATIC int
2040NCR_700_slave_alloc(struct scsi_device *SDp)
2041{
2042 SDp->hostdata = kzalloc(sizeof(struct NCR_700_Device_Parameters),
2043 GFP_KERNEL);
2044
2045 if (!SDp->hostdata)
2046 return -ENOMEM;
2047
2048 return 0;
2049}
2050
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 kfree(SDp->hostdata);
2081 SDp->hostdata = NULL;
2082}
2083
2084static int
2085NCR_700_change_queue_depth(struct scsi_device *SDp, int depth, int reason)
2086{
2087 if (reason != SCSI_QDEPTH_DEFAULT)
2088 return -EOPNOTSUPP;
2089
2090 if (depth > NCR_700_MAX_TAGS)
2091 depth = NCR_700_MAX_TAGS;
2092
2093 scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth);
2094 return depth;
2095}
2096
2097static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
2098{
2099 int change_tag = ((tag_type ==0 && scsi_get_tag_type(SDp) != 0)
2100 || (tag_type != 0 && scsi_get_tag_type(SDp) == 0));
2101 struct NCR_700_Host_Parameters *hostdata =
2102 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2103
2104 scsi_set_tag_type(SDp, tag_type);
2105
2106 /* We have a global (per target) flag to track whether TCQ is
2107 * enabled, so we'll be turning it off for the entire target here.
2108 * our tag algorithm will fail if we mix tagged and untagged commands,
2109 * so quiesce the device before doing this */
2110 if (change_tag)
2111 scsi_target_quiesce(SDp->sdev_target);
2112
2113 if (!tag_type) {
2114 /* shift back to the default unqueued number of commands
2115 * (the user can still raise this) */
2116 scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun);
2117 hostdata->tag_negotiated &= ~(1 << sdev_id(SDp));
2118 } else {
2119 /* Here, we cleared the negotiation flag above, so this
2120 * will force the driver to renegotiate */
2121 scsi_activate_tcq(SDp, SDp->queue_depth);
2122 if (change_tag)
2123 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2124 }
2125 if (change_tag)
2126 scsi_target_resume(SDp->sdev_target);
2127
2128 return tag_type;
2129}
2130
2131static ssize_t
2132NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
2133{
2134 struct scsi_device *SDp = to_scsi_device(dev);
2135
2136 return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2137}
2138
2139static struct device_attribute NCR_700_active_tags_attr = {
2140 .attr = {
2141 .name = "active_tags",
2142 .mode = S_IRUGO,
2143 },
2144 .show = NCR_700_show_active_tags,
2145};
2146
2147STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2148 &NCR_700_active_tags_attr,
2149 NULL,
2150};
2151
2152EXPORT_SYMBOL(NCR_700_detect);
2153EXPORT_SYMBOL(NCR_700_release);
2154EXPORT_SYMBOL(NCR_700_intr);
2155
2156static struct spi_function_template NCR_700_transport_functions = {
2157 .set_period = NCR_700_set_period,
2158 .show_period = 1,
2159 .set_offset = NCR_700_set_offset,
2160 .show_offset = 1,
2161};
2162
2163static int __init NCR_700_init(void)
2164{
2165 NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2166 if(!NCR_700_transport_template)
2167 return -ENODEV;
2168 return 0;
2169}
2170
2171static void __exit NCR_700_exit(void)
2172{
2173 spi_release_transport(NCR_700_transport_template);
2174}
2175
2176module_init(NCR_700_init);
2177module_exit(NCR_700_exit);
2178
1/* -*- mode: c; c-basic-offset: 8 -*- */
2
3/* NCR (or Symbios) 53c700 and 53c700-66 Driver
4 *
5 * Copyright (C) 2001 by James.Bottomley@HansenPartnership.com
6**-----------------------------------------------------------------------------
7**
8** This program is free software; you can redistribute it and/or modify
9** it under the terms of the GNU General Public License as published by
10** the Free Software Foundation; either version 2 of the License, or
11** (at your option) any later version.
12**
13** This program is distributed in the hope that it will be useful,
14** but WITHOUT ANY WARRANTY; without even the implied warranty of
15** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16** GNU General Public License for more details.
17**
18** You should have received a copy of the GNU General Public License
19** along with this program; if not, write to the Free Software
20** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21**
22**-----------------------------------------------------------------------------
23 */
24
25/* Notes:
26 *
27 * This driver is designed exclusively for these chips (virtually the
28 * earliest of the scripts engine chips). They need their own drivers
29 * because they are missing so many of the scripts and snazzy register
30 * features of their elder brothers (the 710, 720 and 770).
31 *
32 * The 700 is the lowliest of the line, it can only do async SCSI.
33 * The 700-66 can at least do synchronous SCSI up to 10MHz.
34 *
35 * The 700 chip has no host bus interface logic of its own. However,
36 * it is usually mapped to a location with well defined register
37 * offsets. Therefore, if you can determine the base address and the
38 * irq your board incorporating this chip uses, you can probably use
39 * this driver to run it (although you'll probably have to write a
40 * minimal wrapper for the purpose---see the NCR_D700 driver for
41 * details about how to do this).
42 *
43 *
44 * TODO List:
45 *
46 * 1. Better statistics in the proc fs
47 *
48 * 2. Implement message queue (queues SCSI messages like commands) and make
49 * the abort and device reset functions use them.
50 * */
51
52/* CHANGELOG
53 *
54 * Version 2.8
55 *
56 * Fixed bad bug affecting tag starvation processing (previously the
57 * driver would hang the system if too many tags starved. Also fixed
58 * bad bug having to do with 10 byte command processing and REQUEST
59 * SENSE (the command would loop forever getting a transfer length
60 * mismatch in the CMD phase).
61 *
62 * Version 2.7
63 *
64 * Fixed scripts problem which caused certain devices (notably CDRWs)
65 * to hang on initial INQUIRY. Updated NCR_700_readl/writel to use
66 * __raw_readl/writel for parisc compatibility (Thomas
67 * Bogendoerfer). Added missing SCp->request_bufflen initialisation
68 * for sense requests (Ryan Bradetich).
69 *
70 * Version 2.6
71 *
72 * Following test of the 64 bit parisc kernel by Richard Hirst,
73 * several problems have now been corrected. Also adds support for
74 * consistent memory allocation.
75 *
76 * Version 2.5
77 *
78 * More Compatibility changes for 710 (now actually works). Enhanced
79 * support for odd clock speeds which constrain SDTR negotiations.
80 * correct cacheline separation for scsi messages and status for
81 * incoherent architectures. Use of the pci mapping functions on
82 * buffers to begin support for 64 bit drivers.
83 *
84 * Version 2.4
85 *
86 * Added support for the 53c710 chip (in 53c700 emulation mode only---no
87 * special 53c710 instructions or registers are used).
88 *
89 * Version 2.3
90 *
91 * More endianness/cache coherency changes.
92 *
93 * Better bad device handling (handles devices lying about tag
94 * queueing support and devices which fail to provide sense data on
95 * contingent allegiance conditions)
96 *
97 * Many thanks to Richard Hirst <rhirst@linuxcare.com> for patiently
98 * debugging this driver on the parisc architecture and suggesting
99 * many improvements and bug fixes.
100 *
101 * Thanks also go to Linuxcare Inc. for providing several PARISC
102 * machines for me to debug the driver on.
103 *
104 * Version 2.2
105 *
106 * Made the driver mem or io mapped; added endian invariance; added
107 * dma cache flushing operations for architectures which need it;
108 * added support for more varied clocking speeds.
109 *
110 * Version 2.1
111 *
112 * Initial modularisation from the D700. See NCR_D700.c for the rest of
113 * the changelog.
114 * */
115#define NCR_700_VERSION "2.8"
116
117#include <linux/kernel.h>
118#include <linux/types.h>
119#include <linux/string.h>
120#include <linux/slab.h>
121#include <linux/ioport.h>
122#include <linux/delay.h>
123#include <linux/spinlock.h>
124#include <linux/completion.h>
125#include <linux/init.h>
126#include <linux/proc_fs.h>
127#include <linux/blkdev.h>
128#include <linux/module.h>
129#include <linux/interrupt.h>
130#include <linux/device.h>
131#include <asm/dma.h>
132#include <asm/io.h>
133#include <asm/pgtable.h>
134#include <asm/byteorder.h>
135
136#include <scsi/scsi.h>
137#include <scsi/scsi_cmnd.h>
138#include <scsi/scsi_dbg.h>
139#include <scsi/scsi_eh.h>
140#include <scsi/scsi_host.h>
141#include <scsi/scsi_tcq.h>
142#include <scsi/scsi_transport.h>
143#include <scsi/scsi_transport_spi.h>
144
145#include "53c700.h"
146
147/* NOTE: For 64 bit drivers there are points in the code where we use
148 * a non dereferenceable pointer to point to a structure in dma-able
149 * memory (which is 32 bits) so that we can use all of the structure
150 * operations but take the address at the end. This macro allows us
151 * to truncate the 64 bit pointer down to 32 bits without the compiler
152 * complaining */
153#define to32bit(x) ((__u32)((unsigned long)(x)))
154
155#ifdef NCR_700_DEBUG
156#define STATIC
157#else
158#define STATIC static
159#endif
160
161MODULE_AUTHOR("James Bottomley");
162MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");
163MODULE_LICENSE("GPL");
164
165/* This is the script */
166#include "53c700_d.h"
167
168
169STATIC int NCR_700_queuecommand(struct Scsi_Host *h, struct scsi_cmnd *);
170STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt);
171STATIC int NCR_700_bus_reset(struct scsi_cmnd * SCpnt);
172STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt);
173STATIC void NCR_700_chip_setup(struct Scsi_Host *host);
174STATIC void NCR_700_chip_reset(struct Scsi_Host *host);
175STATIC int NCR_700_slave_alloc(struct scsi_device *SDpnt);
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);
179
180STATIC struct device_attribute *NCR_700_dev_attrs[];
181
182STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
183
184static char *NCR_700_phase[] = {
185 "",
186 "after selection",
187 "before command phase",
188 "after command phase",
189 "after status phase",
190 "after data in phase",
191 "after data out phase",
192 "during data phase",
193};
194
195static char *NCR_700_condition[] = {
196 "",
197 "NOT MSG_OUT",
198 "UNEXPECTED PHASE",
199 "NOT MSG_IN",
200 "UNEXPECTED MSG",
201 "MSG_IN",
202 "SDTR_MSG RECEIVED",
203 "REJECT_MSG RECEIVED",
204 "DISCONNECT_MSG RECEIVED",
205 "MSG_OUT",
206 "DATA_IN",
207
208};
209
210static char *NCR_700_fatal_messages[] = {
211 "unexpected message after reselection",
212 "still MSG_OUT after message injection",
213 "not MSG_IN after selection",
214 "Illegal message length received",
215};
216
217static char *NCR_700_SBCL_bits[] = {
218 "IO ",
219 "CD ",
220 "MSG ",
221 "ATN ",
222 "SEL ",
223 "BSY ",
224 "ACK ",
225 "REQ ",
226};
227
228static char *NCR_700_SBCL_to_phase[] = {
229 "DATA_OUT",
230 "DATA_IN",
231 "CMD_OUT",
232 "STATE",
233 "ILLEGAL PHASE",
234 "ILLEGAL PHASE",
235 "MSG OUT",
236 "MSG IN",
237};
238
239/* This translates the SDTR message offset and period to a value
240 * which can be loaded into the SXFER_REG.
241 *
242 * NOTE: According to SCSI-2, the true transfer period (in ns) is
243 * actually four times this period value */
244static inline __u8
245NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
246 __u8 offset, __u8 period)
247{
248 int XFERP;
249
250 __u8 min_xferp = (hostdata->chip710
251 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
252 __u8 max_offset = (hostdata->chip710
253 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
254
255 if(offset == 0)
256 return 0;
257
258 if(period < hostdata->min_period) {
259 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4);
260 period = hostdata->min_period;
261 }
262 XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
263 if(offset > max_offset) {
264 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
265 offset, max_offset);
266 offset = max_offset;
267 }
268 if(XFERP < min_xferp) {
269 XFERP = min_xferp;
270 }
271 return (offset & 0x0f) | (XFERP & 0x07)<<4;
272}
273
274static inline __u8
275NCR_700_get_SXFER(struct scsi_device *SDp)
276{
277 struct NCR_700_Host_Parameters *hostdata =
278 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
279
280 return NCR_700_offset_period_to_sxfer(hostdata,
281 spi_offset(SDp->sdev_target),
282 spi_period(SDp->sdev_target));
283}
284
285struct Scsi_Host *
286NCR_700_detect(struct scsi_host_template *tpnt,
287 struct NCR_700_Host_Parameters *hostdata, struct device *dev)
288{
289 dma_addr_t pScript, pSlots;
290 __u8 *memory;
291 __u32 *script;
292 struct Scsi_Host *host;
293 static int banner = 0;
294 int j;
295
296 if(tpnt->sdev_attrs == NULL)
297 tpnt->sdev_attrs = NCR_700_dev_attrs;
298
299 memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
300 &pScript, GFP_KERNEL);
301 if(memory == NULL) {
302 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detaching\n");
303 return NULL;
304 }
305
306 script = (__u32 *)memory;
307 hostdata->msgin = memory + MSGIN_OFFSET;
308 hostdata->msgout = memory + MSGOUT_OFFSET;
309 hostdata->status = memory + STATUS_OFFSET;
310 hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
311 hostdata->dev = dev;
312
313 pSlots = pScript + SLOTS_OFFSET;
314
315 /* Fill in the missing routines from the host template */
316 tpnt->queuecommand = NCR_700_queuecommand;
317 tpnt->eh_abort_handler = NCR_700_abort;
318 tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
319 tpnt->eh_host_reset_handler = NCR_700_host_reset;
320 tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
321 tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
322 tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
323 tpnt->use_clustering = ENABLE_CLUSTERING;
324 tpnt->slave_configure = NCR_700_slave_configure;
325 tpnt->slave_destroy = NCR_700_slave_destroy;
326 tpnt->slave_alloc = NCR_700_slave_alloc;
327 tpnt->change_queue_depth = NCR_700_change_queue_depth;
328
329 if(tpnt->name == NULL)
330 tpnt->name = "53c700";
331 if(tpnt->proc_name == NULL)
332 tpnt->proc_name = "53c700";
333
334 host = scsi_host_alloc(tpnt, 4);
335 if (!host)
336 return NULL;
337 memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
338 * NCR_700_COMMAND_SLOTS_PER_HOST);
339 for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
340 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
341 - (unsigned long)&hostdata->slots[0].SG[0]);
342 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
343 if(j == 0)
344 hostdata->free_list = &hostdata->slots[j];
345 else
346 hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
347 hostdata->slots[j].state = NCR_700_SLOT_FREE;
348 }
349
350 for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)
351 script[j] = bS_to_host(SCRIPT[j]);
352
353 /* adjust all labels to be bus physical */
354 for (j = 0; j < PATCHES; j++)
355 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
356 /* now patch up fixed addresses. */
357 script_patch_32(hostdata->dev, script, MessageLocation,
358 pScript + MSGOUT_OFFSET);
359 script_patch_32(hostdata->dev, script, StatusAddress,
360 pScript + STATUS_OFFSET);
361 script_patch_32(hostdata->dev, script, ReceiveMsgAddress,
362 pScript + MSGIN_OFFSET);
363
364 hostdata->script = script;
365 hostdata->pScript = pScript;
366 dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
367 hostdata->state = NCR_700_HOST_FREE;
368 hostdata->cmd = NULL;
369 host->max_id = 8;
370 host->max_lun = NCR_700_MAX_LUNS;
371 BUG_ON(NCR_700_transport_template == NULL);
372 host->transportt = NCR_700_transport_template;
373 host->unique_id = (unsigned long)hostdata->base;
374 hostdata->eh_complete = NULL;
375 host->hostdata[0] = (unsigned long)hostdata;
376 /* kick the chip */
377 NCR_700_writeb(0xff, host, CTEST9_REG);
378 if (hostdata->chip710)
379 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
380 else
381 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
382 hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
383 if (banner == 0) {
384 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
385 banner = 1;
386 }
387 printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
388 hostdata->chip710 ? "53c710" :
389 (hostdata->fast ? "53c700-66" : "53c700"),
390 hostdata->rev, hostdata->differential ?
391 "(Differential)" : "");
392 /* reset the chip */
393 NCR_700_chip_reset(host);
394
395 if (scsi_add_host(host, dev)) {
396 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
397 scsi_host_put(host);
398 return NULL;
399 }
400
401 spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
402 SPI_SIGNAL_SE;
403
404 return host;
405}
406
407int
408NCR_700_release(struct Scsi_Host *host)
409{
410 struct NCR_700_Host_Parameters *hostdata =
411 (struct NCR_700_Host_Parameters *)host->hostdata[0];
412
413 dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
414 hostdata->script, hostdata->pScript);
415 return 1;
416}
417
418static inline __u8
419NCR_700_identify(int can_disconnect, __u8 lun)
420{
421 return IDENTIFY_BASE |
422 ((can_disconnect) ? 0x40 : 0) |
423 (lun & NCR_700_LUN_MASK);
424}
425
426/*
427 * Function : static int data_residual (Scsi_Host *host)
428 *
429 * Purpose : return residual data count of what's in the chip. If you
430 * really want to know what this function is doing, it's almost a
431 * direct transcription of the algorithm described in the 53c710
432 * guide, except that the DBC and DFIFO registers are only 6 bits
433 * wide on a 53c700.
434 *
435 * Inputs : host - SCSI host */
436static inline int
437NCR_700_data_residual (struct Scsi_Host *host) {
438 struct NCR_700_Host_Parameters *hostdata =
439 (struct NCR_700_Host_Parameters *)host->hostdata[0];
440 int count, synchronous = 0;
441 unsigned int ddir;
442
443 if(hostdata->chip710) {
444 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
445 (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
446 } else {
447 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
448 (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
449 }
450
451 if(hostdata->fast)
452 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
453
454 /* get the data direction */
455 ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
456
457 if (ddir) {
458 /* Receive */
459 if (synchronous)
460 count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
461 else
462 if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
463 ++count;
464 } else {
465 /* Send */
466 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
467 if (sstat & SODL_REG_FULL)
468 ++count;
469 if (synchronous && (sstat & SODR_REG_FULL))
470 ++count;
471 }
472#ifdef NCR_700_DEBUG
473 if(count)
474 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
475#endif
476 return count;
477}
478
479/* print out the SCSI wires and corresponding phase from the SBCL register
480 * in the chip */
481static inline char *
482sbcl_to_string(__u8 sbcl)
483{
484 int i;
485 static char ret[256];
486
487 ret[0]='\0';
488 for(i=0; i<8; i++) {
489 if((1<<i) & sbcl)
490 strcat(ret, NCR_700_SBCL_bits[i]);
491 }
492 strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
493 return ret;
494}
495
496static inline __u8
497bitmap_to_number(__u8 bitmap)
498{
499 __u8 i;
500
501 for(i=0; i<8 && !(bitmap &(1<<i)); i++)
502 ;
503 return i;
504}
505
506/* Pull a slot off the free list */
507STATIC struct NCR_700_command_slot *
508find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
509{
510 struct NCR_700_command_slot *slot = hostdata->free_list;
511
512 if(slot == NULL) {
513 /* sanity check */
514 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
515 printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
516 return NULL;
517 }
518
519 if(slot->state != NCR_700_SLOT_FREE)
520 /* should panic! */
521 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
522
523
524 hostdata->free_list = slot->ITL_forw;
525 slot->ITL_forw = NULL;
526
527
528 /* NOTE: set the state to busy here, not queued, since this
529 * indicates the slot is in use and cannot be run by the IRQ
530 * finish routine. If we cannot queue the command when it
531 * is properly build, we then change to NCR_700_SLOT_QUEUED */
532 slot->state = NCR_700_SLOT_BUSY;
533 slot->flags = 0;
534 hostdata->command_slot_count++;
535
536 return slot;
537}
538
539STATIC void
540free_slot(struct NCR_700_command_slot *slot,
541 struct NCR_700_Host_Parameters *hostdata)
542{
543 if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
544 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
545 }
546 if(slot->state == NCR_700_SLOT_FREE) {
547 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
548 }
549
550 slot->resume_offset = 0;
551 slot->cmnd = NULL;
552 slot->state = NCR_700_SLOT_FREE;
553 slot->ITL_forw = hostdata->free_list;
554 hostdata->free_list = slot;
555 hostdata->command_slot_count--;
556}
557
558
559/* This routine really does very little. The command is indexed on
560 the ITL and (if tagged) the ITLQ lists in _queuecommand */
561STATIC void
562save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
563 struct scsi_cmnd *SCp, __u32 dsp)
564{
565 /* Its just possible that this gets executed twice */
566 if(SCp != NULL) {
567 struct NCR_700_command_slot *slot =
568 (struct NCR_700_command_slot *)SCp->host_scribble;
569
570 slot->resume_offset = dsp;
571 }
572 hostdata->state = NCR_700_HOST_FREE;
573 hostdata->cmd = NULL;
574}
575
576STATIC inline void
577NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
578 struct NCR_700_command_slot *slot)
579{
580 if(SCp->sc_data_direction != DMA_NONE &&
581 SCp->sc_data_direction != DMA_BIDIRECTIONAL)
582 scsi_dma_unmap(SCp);
583}
584
585STATIC inline void
586NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
587 struct scsi_cmnd *SCp, int result)
588{
589 hostdata->state = NCR_700_HOST_FREE;
590 hostdata->cmd = NULL;
591
592 if(SCp != NULL) {
593 struct NCR_700_command_slot *slot =
594 (struct NCR_700_command_slot *)SCp->host_scribble;
595
596 dma_unmap_single(hostdata->dev, slot->pCmd,
597 MAX_COMMAND_SIZE, DMA_TO_DEVICE);
598 if (slot->flags == NCR_700_FLAG_AUTOSENSE) {
599 char *cmnd = NCR_700_get_sense_cmnd(SCp->device);
600
601 dma_unmap_single(hostdata->dev, slot->dma_handle,
602 SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
603 /* restore the old result if the request sense was
604 * successful */
605 if (result == 0)
606 result = cmnd[7];
607 /* restore the original length */
608 SCp->cmd_len = cmnd[8];
609 } else
610 NCR_700_unmap(hostdata, SCp, slot);
611
612 free_slot(slot, hostdata);
613#ifdef NCR_700_DEBUG
614 if(NCR_700_get_depth(SCp->device) == 0 ||
615 NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
616 printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
617 NCR_700_get_depth(SCp->device));
618#endif /* NCR_700_DEBUG */
619 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
620
621 SCp->host_scribble = NULL;
622 SCp->result = result;
623 SCp->scsi_done(SCp);
624 } else {
625 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
626 }
627}
628
629
630STATIC void
631NCR_700_internal_bus_reset(struct Scsi_Host *host)
632{
633 /* Bus reset */
634 NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
635 udelay(50);
636 NCR_700_writeb(0, host, SCNTL1_REG);
637
638}
639
640STATIC void
641NCR_700_chip_setup(struct Scsi_Host *host)
642{
643 struct NCR_700_Host_Parameters *hostdata =
644 (struct NCR_700_Host_Parameters *)host->hostdata[0];
645 __u8 min_period;
646 __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
647
648 if(hostdata->chip710) {
649 __u8 burst_disable = 0;
650 __u8 burst_length = 0;
651
652 switch (hostdata->burst_length) {
653 case 1:
654 burst_length = BURST_LENGTH_1;
655 break;
656 case 2:
657 burst_length = BURST_LENGTH_2;
658 break;
659 case 4:
660 burst_length = BURST_LENGTH_4;
661 break;
662 case 8:
663 burst_length = BURST_LENGTH_8;
664 break;
665 default:
666 burst_disable = BURST_DISABLE;
667 break;
668 }
669 hostdata->dcntl_extra |= COMPAT_700_MODE;
670
671 NCR_700_writeb(hostdata->dcntl_extra, host, DCNTL_REG);
672 NCR_700_writeb(burst_length | hostdata->dmode_extra,
673 host, DMODE_710_REG);
674 NCR_700_writeb(burst_disable | hostdata->ctest7_extra |
675 (hostdata->differential ? DIFF : 0),
676 host, CTEST7_REG);
677 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
678 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
679 | AUTO_ATN, host, SCNTL0_REG);
680 } else {
681 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
682 host, DMODE_700_REG);
683 NCR_700_writeb(hostdata->differential ?
684 DIFF : 0, host, CTEST7_REG);
685 if(hostdata->fast) {
686 /* this is for 700-66, does nothing on 700 */
687 NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
688 | GENERATE_RECEIVE_PARITY, host,
689 CTEST8_REG);
690 } else {
691 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
692 | PARITY | AUTO_ATN, host, SCNTL0_REG);
693 }
694 }
695
696 NCR_700_writeb(1 << host->this_id, host, SCID_REG);
697 NCR_700_writeb(0, host, SBCL_REG);
698 NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
699
700 NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
701 | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
702
703 NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
704 NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
705 if(hostdata->clock > 75) {
706 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
707 /* do the best we can, but the async clock will be out
708 * of spec: sync divider 2, async divider 3 */
709 DEBUG(("53c700: sync 2 async 3\n"));
710 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
711 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
712 hostdata->sync_clock = hostdata->clock/2;
713 } else if(hostdata->clock > 50 && hostdata->clock <= 75) {
714 /* sync divider 1.5, async divider 3 */
715 DEBUG(("53c700: sync 1.5 async 3\n"));
716 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
717 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
718 hostdata->sync_clock = hostdata->clock*2;
719 hostdata->sync_clock /= 3;
720
721 } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
722 /* sync divider 1, async divider 2 */
723 DEBUG(("53c700: sync 1 async 2\n"));
724 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
725 NCR_700_writeb(ASYNC_DIV_2_0 | hostdata->dcntl_extra, host, DCNTL_REG);
726 hostdata->sync_clock = hostdata->clock;
727 } else if(hostdata->clock > 25 && hostdata->clock <=37) {
728 /* sync divider 1, async divider 1.5 */
729 DEBUG(("53c700: sync 1 async 1.5\n"));
730 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
731 NCR_700_writeb(ASYNC_DIV_1_5 | hostdata->dcntl_extra, host, DCNTL_REG);
732 hostdata->sync_clock = hostdata->clock;
733 } else {
734 DEBUG(("53c700: sync 1 async 1\n"));
735 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
736 NCR_700_writeb(ASYNC_DIV_1_0 | hostdata->dcntl_extra, host, DCNTL_REG);
737 /* sync divider 1, async divider 1 */
738 hostdata->sync_clock = hostdata->clock;
739 }
740 /* Calculate the actual minimum period that can be supported
741 * by our synchronous clock speed. See the 710 manual for
742 * exact details of this calculation which is based on a
743 * setting of the SXFER register */
744 min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
745 hostdata->min_period = NCR_700_MIN_PERIOD;
746 if(min_period > NCR_700_MIN_PERIOD)
747 hostdata->min_period = min_period;
748}
749
750STATIC void
751NCR_700_chip_reset(struct Scsi_Host *host)
752{
753 struct NCR_700_Host_Parameters *hostdata =
754 (struct NCR_700_Host_Parameters *)host->hostdata[0];
755 if(hostdata->chip710) {
756 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
757 udelay(100);
758
759 NCR_700_writeb(0, host, ISTAT_REG);
760 } else {
761 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
762 udelay(100);
763
764 NCR_700_writeb(0, host, DCNTL_REG);
765 }
766
767 mdelay(1000);
768
769 NCR_700_chip_setup(host);
770}
771
772/* The heart of the message processing engine is that the instruction
773 * immediately after the INT is the normal case (and so must be CLEAR
774 * ACK). If we want to do something else, we call that routine in
775 * scripts and set temp to be the normal case + 8 (skipping the CLEAR
776 * ACK) so that the routine returns correctly to resume its activity
777 * */
778STATIC __u32
779process_extended_message(struct Scsi_Host *host,
780 struct NCR_700_Host_Parameters *hostdata,
781 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
782{
783 __u32 resume_offset = dsp, temp = dsp + 8;
784 __u8 pun = 0xff, lun = 0xff;
785
786 if(SCp != NULL) {
787 pun = SCp->device->id;
788 lun = SCp->device->lun;
789 }
790
791 switch(hostdata->msgin[2]) {
792 case A_SDTR_MSG:
793 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
794 struct scsi_target *starget = SCp->device->sdev_target;
795 __u8 period = hostdata->msgin[3];
796 __u8 offset = hostdata->msgin[4];
797
798 if(offset == 0 || period == 0) {
799 offset = 0;
800 period = 0;
801 }
802
803 spi_offset(starget) = offset;
804 spi_period(starget) = period;
805
806 if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
807 spi_display_xfer_agreement(starget);
808 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
809 }
810
811 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
812 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
813
814 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
815 host, SXFER_REG);
816
817 } else {
818 /* SDTR message out of the blue, reject it */
819 shost_printk(KERN_WARNING, host,
820 "Unexpected SDTR msg\n");
821 hostdata->msgout[0] = A_REJECT_MSG;
822 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
823 script_patch_16(hostdata->dev, hostdata->script,
824 MessageCount, 1);
825 /* SendMsgOut returns, so set up the return
826 * address */
827 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
828 }
829 break;
830
831 case A_WDTR_MSG:
832 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
833 host->host_no, pun, lun);
834 hostdata->msgout[0] = A_REJECT_MSG;
835 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
836 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
837 1);
838 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
839
840 break;
841
842 default:
843 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
844 host->host_no, pun, lun,
845 NCR_700_phase[(dsps & 0xf00) >> 8]);
846 spi_print_msg(hostdata->msgin);
847 printk("\n");
848 /* just reject it */
849 hostdata->msgout[0] = A_REJECT_MSG;
850 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
851 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
852 1);
853 /* SendMsgOut returns, so set up the return
854 * address */
855 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
856 }
857 NCR_700_writel(temp, host, TEMP_REG);
858 return resume_offset;
859}
860
861STATIC __u32
862process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
863 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
864{
865 /* work out where to return to */
866 __u32 temp = dsp + 8, resume_offset = dsp;
867 __u8 pun = 0xff, lun = 0xff;
868
869 if(SCp != NULL) {
870 pun = SCp->device->id;
871 lun = SCp->device->lun;
872 }
873
874#ifdef NCR_700_DEBUG
875 printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
876 NCR_700_phase[(dsps & 0xf00) >> 8]);
877 spi_print_msg(hostdata->msgin);
878 printk("\n");
879#endif
880
881 switch(hostdata->msgin[0]) {
882
883 case A_EXTENDED_MSG:
884 resume_offset = process_extended_message(host, hostdata, SCp,
885 dsp, dsps);
886 break;
887
888 case A_REJECT_MSG:
889 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
890 /* Rejected our sync negotiation attempt */
891 spi_period(SCp->device->sdev_target) =
892 spi_offset(SCp->device->sdev_target) = 0;
893 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
894 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
895 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
896 /* rejected our first simple tag message */
897 scmd_printk(KERN_WARNING, SCp,
898 "Rejected first tag queue attempt, turning off tag queueing\n");
899 /* we're done negotiating */
900 NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
901 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
902
903 SCp->device->tagged_supported = 0;
904 SCp->device->simple_tags = 0;
905 scsi_change_queue_depth(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
950STATIC __u32
951process_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 MAX_COMMAND_SIZE,
1000 DMA_TO_DEVICE);
1001
1002 cmnd[0] = REQUEST_SENSE;
1003 cmnd[1] = (lun & 0x7) << 5;
1004 cmnd[2] = 0;
1005 cmnd[3] = 0;
1006 cmnd[4] = SCSI_SENSE_BUFFERSIZE;
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, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1021 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | SCSI_SENSE_BUFFERSIZE);
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, SCSI_SENSE_BUFFERSIZE, 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;
1110
1111 SCp = scsi_host_find_tag(SDp->host, hostdata->msgin[2]);
1112 if(unlikely(SCp == NULL)) {
1113 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1114 host->host_no, reselection_id, lun, hostdata->msgin[2]);
1115 BUG();
1116 }
1117
1118 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1119 DDEBUG(KERN_DEBUG, SDp,
1120 "reselection is tag %d, slot %p(%d)\n",
1121 hostdata->msgin[2], slot, slot->tag);
1122 } else {
1123 struct scsi_cmnd *SCp;
1124
1125 SCp = scsi_host_find_tag(SDp->host, SCSI_NO_TAG);
1126 if(unlikely(SCp == NULL)) {
1127 sdev_printk(KERN_ERR, SDp,
1128 "no saved request for untagged cmd\n");
1129 BUG();
1130 }
1131 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1132 }
1133
1134 if(slot == NULL) {
1135 printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1136 host->host_no, reselection_id, lun,
1137 hostdata->msgin[0], hostdata->msgin[1],
1138 hostdata->msgin[2]);
1139 } else {
1140 if(hostdata->state != NCR_700_HOST_BUSY)
1141 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1142 host->host_no);
1143 resume_offset = slot->resume_offset;
1144 hostdata->cmd = slot->cmnd;
1145
1146 /* re-patch for this command */
1147 script_patch_32_abs(hostdata->dev, hostdata->script,
1148 CommandAddress, slot->pCmd);
1149 script_patch_16(hostdata->dev, hostdata->script,
1150 CommandCount, slot->cmnd->cmd_len);
1151 script_patch_32_abs(hostdata->dev, hostdata->script,
1152 SGScriptStartAddress,
1153 to32bit(&slot->pSG[0].ins));
1154
1155 /* Note: setting SXFER only works if we're
1156 * still in the MESSAGE phase, so it is vital
1157 * that ACK is still asserted when we process
1158 * the reselection message. The resume offset
1159 * should therefore always clear ACK */
1160 NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1161 host, SXFER_REG);
1162 dma_cache_sync(hostdata->dev, hostdata->msgin,
1163 MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1164 dma_cache_sync(hostdata->dev, hostdata->msgout,
1165 MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1166 /* I'm just being paranoid here, the command should
1167 * already have been flushed from the cache */
1168 dma_cache_sync(hostdata->dev, slot->cmnd->cmnd,
1169 slot->cmnd->cmd_len, DMA_TO_DEVICE);
1170
1171
1172
1173 }
1174 } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1175
1176 /* This section is full of debugging code because I've
1177 * never managed to reach it. I think what happens is
1178 * that, because the 700 runs with selection
1179 * interrupts enabled the whole time that we take a
1180 * selection interrupt before we manage to get to the
1181 * reselected script interrupt */
1182
1183 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1184 struct NCR_700_command_slot *slot;
1185
1186 /* Take out our own ID */
1187 reselection_id &= ~(1<<host->this_id);
1188
1189 /* I've never seen this happen, so keep this as a printk rather
1190 * than a debug */
1191 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1192 host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1193
1194 {
1195 /* FIXME: DEBUGGING CODE */
1196 __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1197 int i;
1198
1199 for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1200 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1201 && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1202 break;
1203 }
1204 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);
1205 SCp = hostdata->slots[i].cmnd;
1206 }
1207
1208 if(SCp != NULL) {
1209 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1210 /* change slot from busy to queued to redo command */
1211 slot->state = NCR_700_SLOT_QUEUED;
1212 }
1213 hostdata->cmd = NULL;
1214
1215 if(reselection_id == 0) {
1216 if(hostdata->reselection_id == 0xff) {
1217 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1218 return 0;
1219 } else {
1220 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1221 host->host_no);
1222 reselection_id = hostdata->reselection_id;
1223 }
1224 } else {
1225
1226 /* convert to real ID */
1227 reselection_id = bitmap_to_number(reselection_id);
1228 }
1229 hostdata->reselection_id = reselection_id;
1230 /* just in case we have a stale simple tag message, clear it */
1231 hostdata->msgin[1] = 0;
1232 dma_cache_sync(hostdata->dev, hostdata->msgin,
1233 MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1234 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1235 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1236 } else {
1237 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1238 }
1239 } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1240 /* we've just disconnected from the bus, do nothing since
1241 * a return here will re-run the queued command slot
1242 * that may have been interrupted by the initial selection */
1243 DEBUG((" SELECTION COMPLETED\n"));
1244 } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1245 resume_offset = process_message(host, hostdata, SCp,
1246 dsp, dsps);
1247 } else if((dsps & 0xfffff000) == 0) {
1248 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1249 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1250 host->host_no, pun, lun, NCR_700_condition[i],
1251 NCR_700_phase[j], dsp - hostdata->pScript);
1252 if(SCp != NULL) {
1253 struct scatterlist *sg;
1254
1255 scsi_print_command(SCp);
1256 scsi_for_each_sg(SCp, sg, scsi_sg_count(SCp) + 1, i) {
1257 printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, sg->length, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].ins, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].pAddr);
1258 }
1259 }
1260 NCR_700_internal_bus_reset(host);
1261 } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1262 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1263 host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1264 resume_offset = dsp;
1265 } else {
1266 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1267 host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1268 NCR_700_internal_bus_reset(host);
1269 }
1270 return resume_offset;
1271}
1272
1273/* We run the 53c700 with selection interrupts always enabled. This
1274 * means that the chip may be selected as soon as the bus frees. On a
1275 * busy bus, this can be before the scripts engine finishes its
1276 * processing. Therefore, part of the selection processing has to be
1277 * to find out what the scripts engine is doing and complete the
1278 * function if necessary (i.e. process the pending disconnect or save
1279 * the interrupted initial selection */
1280STATIC inline __u32
1281process_selection(struct Scsi_Host *host, __u32 dsp)
1282{
1283 __u8 id = 0; /* Squash compiler warning */
1284 int count = 0;
1285 __u32 resume_offset = 0;
1286 struct NCR_700_Host_Parameters *hostdata =
1287 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1288 struct scsi_cmnd *SCp = hostdata->cmd;
1289 __u8 sbcl;
1290
1291 for(count = 0; count < 5; count++) {
1292 id = NCR_700_readb(host, hostdata->chip710 ?
1293 CTEST9_REG : SFBR_REG);
1294
1295 /* Take out our own ID */
1296 id &= ~(1<<host->this_id);
1297 if(id != 0)
1298 break;
1299 udelay(5);
1300 }
1301 sbcl = NCR_700_readb(host, SBCL_REG);
1302 if((sbcl & SBCL_IO) == 0) {
1303 /* mark as having been selected rather than reselected */
1304 id = 0xff;
1305 } else {
1306 /* convert to real ID */
1307 hostdata->reselection_id = id = bitmap_to_number(id);
1308 DEBUG(("scsi%d: Reselected by %d\n",
1309 host->host_no, id));
1310 }
1311 if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1312 struct NCR_700_command_slot *slot =
1313 (struct NCR_700_command_slot *)SCp->host_scribble;
1314 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));
1315
1316 switch(dsp - hostdata->pScript) {
1317 case Ent_Disconnect1:
1318 case Ent_Disconnect2:
1319 save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1320 break;
1321 case Ent_Disconnect3:
1322 case Ent_Disconnect4:
1323 save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1324 break;
1325 case Ent_Disconnect5:
1326 case Ent_Disconnect6:
1327 save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1328 break;
1329 case Ent_Disconnect7:
1330 case Ent_Disconnect8:
1331 save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1332 break;
1333 case Ent_Finish1:
1334 case Ent_Finish2:
1335 process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1336 break;
1337
1338 default:
1339 slot->state = NCR_700_SLOT_QUEUED;
1340 break;
1341 }
1342 }
1343 hostdata->state = NCR_700_HOST_BUSY;
1344 hostdata->cmd = NULL;
1345 /* clear any stale simple tag message */
1346 hostdata->msgin[1] = 0;
1347 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1348 DMA_BIDIRECTIONAL);
1349
1350 if(id == 0xff) {
1351 /* Selected as target, Ignore */
1352 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1353 } else if(hostdata->tag_negotiated & (1<<id)) {
1354 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1355 } else {
1356 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1357 }
1358 return resume_offset;
1359}
1360
1361static inline void
1362NCR_700_clear_fifo(struct Scsi_Host *host) {
1363 const struct NCR_700_Host_Parameters *hostdata
1364 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1365 if(hostdata->chip710) {
1366 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1367 } else {
1368 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1369 }
1370}
1371
1372static inline void
1373NCR_700_flush_fifo(struct Scsi_Host *host) {
1374 const struct NCR_700_Host_Parameters *hostdata
1375 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1376 if(hostdata->chip710) {
1377 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1378 udelay(10);
1379 NCR_700_writeb(0, host, CTEST8_REG);
1380 } else {
1381 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1382 udelay(10);
1383 NCR_700_writeb(0, host, DFIFO_REG);
1384 }
1385}
1386
1387
1388/* The queue lock with interrupts disabled must be held on entry to
1389 * this function */
1390STATIC int
1391NCR_700_start_command(struct scsi_cmnd *SCp)
1392{
1393 struct NCR_700_command_slot *slot =
1394 (struct NCR_700_command_slot *)SCp->host_scribble;
1395 struct NCR_700_Host_Parameters *hostdata =
1396 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1397 __u16 count = 1; /* for IDENTIFY message */
1398 u8 lun = SCp->device->lun;
1399
1400 if(hostdata->state != NCR_700_HOST_FREE) {
1401 /* keep this inside the lock to close the race window where
1402 * the running command finishes on another CPU while we don't
1403 * change the state to queued on this one */
1404 slot->state = NCR_700_SLOT_QUEUED;
1405
1406 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1407 SCp->device->host->host_no, slot->cmnd, slot));
1408 return 0;
1409 }
1410 hostdata->state = NCR_700_HOST_BUSY;
1411 hostdata->cmd = SCp;
1412 slot->state = NCR_700_SLOT_BUSY;
1413 /* keep interrupts disabled until we have the command correctly
1414 * set up so we cannot take a selection interrupt */
1415
1416 hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&
1417 slot->flags != NCR_700_FLAG_AUTOSENSE),
1418 lun);
1419 /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1420 * if the negotiated transfer parameters still hold, so
1421 * always renegotiate them */
1422 if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||
1423 slot->flags == NCR_700_FLAG_AUTOSENSE) {
1424 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1425 }
1426
1427 /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1428 * If a contingent allegiance condition exists, the device
1429 * will refuse all tags, so send the request sense as untagged
1430 * */
1431 if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1432 && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&
1433 slot->flags != NCR_700_FLAG_AUTOSENSE)) {
1434 count += spi_populate_tag_msg(&hostdata->msgout[count], SCp);
1435 }
1436
1437 if(hostdata->fast &&
1438 NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1439 count += spi_populate_sync_msg(&hostdata->msgout[count],
1440 spi_period(SCp->device->sdev_target),
1441 spi_offset(SCp->device->sdev_target));
1442 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1443 }
1444
1445 script_patch_16(hostdata->dev, hostdata->script, MessageCount, count);
1446
1447
1448 script_patch_ID(hostdata->dev, hostdata->script,
1449 Device_ID, 1<<scmd_id(SCp));
1450
1451 script_patch_32_abs(hostdata->dev, hostdata->script, CommandAddress,
1452 slot->pCmd);
1453 script_patch_16(hostdata->dev, hostdata->script, CommandCount,
1454 SCp->cmd_len);
1455 /* finally plumb the beginning of the SG list into the script
1456 * */
1457 script_patch_32_abs(hostdata->dev, hostdata->script,
1458 SGScriptStartAddress, to32bit(&slot->pSG[0].ins));
1459 NCR_700_clear_fifo(SCp->device->host);
1460
1461 if(slot->resume_offset == 0)
1462 slot->resume_offset = hostdata->pScript;
1463 /* now perform all the writebacks and invalidates */
1464 dma_cache_sync(hostdata->dev, hostdata->msgout, count, DMA_TO_DEVICE);
1465 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1466 DMA_FROM_DEVICE);
1467 dma_cache_sync(hostdata->dev, SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1468 dma_cache_sync(hostdata->dev, hostdata->status, 1, DMA_FROM_DEVICE);
1469
1470 /* set the synchronous period/offset */
1471 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1472 SCp->device->host, SXFER_REG);
1473 NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1474 NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1475
1476 return 1;
1477}
1478
1479irqreturn_t
1480NCR_700_intr(int irq, void *dev_id)
1481{
1482 struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1483 struct NCR_700_Host_Parameters *hostdata =
1484 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1485 __u8 istat;
1486 __u32 resume_offset = 0;
1487 __u8 pun = 0xff, lun = 0xff;
1488 unsigned long flags;
1489 int handled = 0;
1490
1491 /* Use the host lock to serialise access to the 53c700
1492 * hardware. Note: In future, we may need to take the queue
1493 * lock to enter the done routines. When that happens, we
1494 * need to ensure that for this driver, the host lock and the
1495 * queue lock point to the same thing. */
1496 spin_lock_irqsave(host->host_lock, flags);
1497 if((istat = NCR_700_readb(host, ISTAT_REG))
1498 & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1499 __u32 dsps;
1500 __u8 sstat0 = 0, dstat = 0;
1501 __u32 dsp;
1502 struct scsi_cmnd *SCp = hostdata->cmd;
1503 enum NCR_700_Host_State state;
1504
1505 handled = 1;
1506 state = hostdata->state;
1507 SCp = hostdata->cmd;
1508
1509 if(istat & SCSI_INT_PENDING) {
1510 udelay(10);
1511
1512 sstat0 = NCR_700_readb(host, SSTAT0_REG);
1513 }
1514
1515 if(istat & DMA_INT_PENDING) {
1516 udelay(10);
1517
1518 dstat = NCR_700_readb(host, DSTAT_REG);
1519 }
1520
1521 dsps = NCR_700_readl(host, DSPS_REG);
1522 dsp = NCR_700_readl(host, DSP_REG);
1523
1524 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1525 host->host_no, istat, sstat0, dstat,
1526 (dsp - (__u32)(hostdata->pScript))/4,
1527 dsp, dsps));
1528
1529 if(SCp != NULL) {
1530 pun = SCp->device->id;
1531 lun = SCp->device->lun;
1532 }
1533
1534 if(sstat0 & SCSI_RESET_DETECTED) {
1535 struct scsi_device *SDp;
1536 int i;
1537
1538 hostdata->state = NCR_700_HOST_BUSY;
1539
1540 printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1541 host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1542
1543 scsi_report_bus_reset(host, 0);
1544
1545 /* clear all the negotiated parameters */
1546 __shost_for_each_device(SDp, host)
1547 NCR_700_clear_flag(SDp, ~0);
1548
1549 /* clear all the slots and their pending commands */
1550 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1551 struct scsi_cmnd *SCp;
1552 struct NCR_700_command_slot *slot =
1553 &hostdata->slots[i];
1554
1555 if(slot->state == NCR_700_SLOT_FREE)
1556 continue;
1557
1558 SCp = slot->cmnd;
1559 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1560 slot, SCp);
1561 free_slot(slot, hostdata);
1562 SCp->host_scribble = NULL;
1563 NCR_700_set_depth(SCp->device, 0);
1564 /* NOTE: deadlock potential here: we
1565 * rely on mid-layer guarantees that
1566 * scsi_done won't try to issue the
1567 * command again otherwise we'll
1568 * deadlock on the
1569 * hostdata->state_lock */
1570 SCp->result = DID_RESET << 16;
1571 SCp->scsi_done(SCp);
1572 }
1573 mdelay(25);
1574 NCR_700_chip_setup(host);
1575
1576 hostdata->state = NCR_700_HOST_FREE;
1577 hostdata->cmd = NULL;
1578 /* signal back if this was an eh induced reset */
1579 if(hostdata->eh_complete != NULL)
1580 complete(hostdata->eh_complete);
1581 goto out_unlock;
1582 } else if(sstat0 & SELECTION_TIMEOUT) {
1583 DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1584 host->host_no, pun, lun));
1585 NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1586 } else if(sstat0 & PHASE_MISMATCH) {
1587 struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1588 (struct NCR_700_command_slot *)SCp->host_scribble;
1589
1590 if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1591 /* It wants to reply to some part of
1592 * our message */
1593#ifdef NCR_700_DEBUG
1594 __u32 temp = NCR_700_readl(host, TEMP_REG);
1595 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1596 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)));
1597#endif
1598 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1599 } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1600 dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1601 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1602 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1603 int residual = NCR_700_data_residual(host);
1604 int i;
1605#ifdef NCR_700_DEBUG
1606 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1607
1608 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1609 host->host_no, pun, lun,
1610 SGcount, data_transfer);
1611 scsi_print_command(SCp);
1612 if(residual) {
1613 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1614 host->host_no, pun, lun,
1615 SGcount, data_transfer, residual);
1616 }
1617#endif
1618 data_transfer += residual;
1619
1620 if(data_transfer != 0) {
1621 int count;
1622 __u32 pAddr;
1623
1624 SGcount--;
1625
1626 count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1627 DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1628 slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1629 slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1630 pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1631 pAddr += (count - data_transfer);
1632#ifdef NCR_700_DEBUG
1633 if(pAddr != naddr) {
1634 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);
1635 }
1636#endif
1637 slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1638 }
1639 /* set the executed moves to nops */
1640 for(i=0; i<SGcount; i++) {
1641 slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1642 slot->SG[i].pAddr = 0;
1643 }
1644 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1645 /* and pretend we disconnected after
1646 * the command phase */
1647 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1648 /* make sure all the data is flushed */
1649 NCR_700_flush_fifo(host);
1650 } else {
1651 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1652 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1653 host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1654 NCR_700_internal_bus_reset(host);
1655 }
1656
1657 } else if(sstat0 & SCSI_GROSS_ERROR) {
1658 printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1659 host->host_no, pun, lun);
1660 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1661 } else if(sstat0 & PARITY_ERROR) {
1662 printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1663 host->host_no, pun, lun);
1664 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1665 } else if(dstat & SCRIPT_INT_RECEIVED) {
1666 DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1667 host->host_no, pun, lun));
1668 resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1669 } else if(dstat & (ILGL_INST_DETECTED)) {
1670 printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1671 " Please email James.Bottomley@HansenPartnership.com with the details\n",
1672 host->host_no, pun, lun,
1673 dsp, dsp - hostdata->pScript);
1674 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1675 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1676 printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1677 host->host_no, pun, lun, dstat);
1678 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1679 }
1680
1681
1682 /* NOTE: selection interrupt processing MUST occur
1683 * after script interrupt processing to correctly cope
1684 * with the case where we process a disconnect and
1685 * then get reselected before we process the
1686 * disconnection */
1687 if(sstat0 & SELECTED) {
1688 /* FIXME: It currently takes at least FOUR
1689 * interrupts to complete a command that
1690 * disconnects: one for the disconnect, one
1691 * for the reselection, one to get the
1692 * reselection data and one to complete the
1693 * command. If we guess the reselected
1694 * command here and prepare it, we only need
1695 * to get a reselection data interrupt if we
1696 * guessed wrongly. Since the interrupt
1697 * overhead is much greater than the command
1698 * setup, this would be an efficient
1699 * optimisation particularly as we probably
1700 * only have one outstanding command on a
1701 * target most of the time */
1702
1703 resume_offset = process_selection(host, dsp);
1704
1705 }
1706
1707 }
1708
1709 if(resume_offset) {
1710 if(hostdata->state != NCR_700_HOST_BUSY) {
1711 printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1712 host->host_no, resume_offset, resume_offset - hostdata->pScript);
1713 hostdata->state = NCR_700_HOST_BUSY;
1714 }
1715
1716 DEBUG(("Attempting to resume at %x\n", resume_offset));
1717 NCR_700_clear_fifo(host);
1718 NCR_700_writel(resume_offset, host, DSP_REG);
1719 }
1720 /* There is probably a technical no-no about this: If we're a
1721 * shared interrupt and we got this interrupt because the
1722 * other device needs servicing not us, we're still going to
1723 * check our queued commands here---of course, there shouldn't
1724 * be any outstanding.... */
1725 if(hostdata->state == NCR_700_HOST_FREE) {
1726 int i;
1727
1728 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1729 /* fairness: always run the queue from the last
1730 * position we left off */
1731 int j = (i + hostdata->saved_slot_position)
1732 % NCR_700_COMMAND_SLOTS_PER_HOST;
1733
1734 if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1735 continue;
1736 if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1737 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1738 host->host_no, &hostdata->slots[j],
1739 hostdata->slots[j].cmnd));
1740 hostdata->saved_slot_position = j + 1;
1741 }
1742
1743 break;
1744 }
1745 }
1746 out_unlock:
1747 spin_unlock_irqrestore(host->host_lock, flags);
1748 return IRQ_RETVAL(handled);
1749}
1750
1751static int
1752NCR_700_queuecommand_lck(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1753{
1754 struct NCR_700_Host_Parameters *hostdata =
1755 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1756 __u32 move_ins;
1757 enum dma_data_direction direction;
1758 struct NCR_700_command_slot *slot;
1759
1760 if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1761 /* We're over our allocation, this should never happen
1762 * since we report the max allocation to the mid layer */
1763 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1764 return 1;
1765 }
1766 /* check for untagged commands. We cannot have any outstanding
1767 * commands if we accept them. Commands could be untagged because:
1768 *
1769 * - The tag negotiated bitmap is clear
1770 * - The blk layer sent and untagged command
1771 */
1772 if(NCR_700_get_depth(SCp->device) != 0
1773 && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1774 || !(SCp->flags & SCMD_TAGGED))) {
1775 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1776 NCR_700_get_depth(SCp->device));
1777 return SCSI_MLQUEUE_DEVICE_BUSY;
1778 }
1779 if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1780 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1781 NCR_700_get_depth(SCp->device));
1782 return SCSI_MLQUEUE_DEVICE_BUSY;
1783 }
1784 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1785
1786 /* begin the command here */
1787 /* no need to check for NULL, test for command_slot_count above
1788 * ensures a slot is free */
1789 slot = find_empty_slot(hostdata);
1790
1791 slot->cmnd = SCp;
1792
1793 SCp->scsi_done = done;
1794 SCp->host_scribble = (unsigned char *)slot;
1795 SCp->SCp.ptr = NULL;
1796 SCp->SCp.buffer = NULL;
1797
1798#ifdef NCR_700_DEBUG
1799 printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1800 scsi_print_command(SCp);
1801#endif
1802 if ((SCp->flags & SCMD_TAGGED)
1803 && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1804 && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1805 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1806 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1807 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1808 }
1809
1810 /* here we may have to process an untagged command. The gate
1811 * above ensures that this will be the only one outstanding,
1812 * so clear the tag negotiated bit.
1813 *
1814 * FIXME: This will royally screw up on multiple LUN devices
1815 * */
1816 if (!(SCp->flags & SCMD_TAGGED)
1817 && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1818 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1819 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1820 }
1821
1822 if ((hostdata->tag_negotiated & (1<<scmd_id(SCp))) &&
1823 SCp->device->simple_tags) {
1824 slot->tag = SCp->request->tag;
1825 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1826 slot->tag, slot);
1827 } else {
1828 slot->tag = SCSI_NO_TAG;
1829 /* must populate current_cmnd for scsi_host_find_tag to work */
1830 SCp->device->current_cmnd = SCp;
1831 }
1832 /* sanity check: some of the commands generated by the mid-layer
1833 * have an eccentric idea of their sc_data_direction */
1834 if(!scsi_sg_count(SCp) && !scsi_bufflen(SCp) &&
1835 SCp->sc_data_direction != DMA_NONE) {
1836#ifdef NCR_700_DEBUG
1837 printk("53c700: Command");
1838 scsi_print_command(SCp);
1839 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1840#endif
1841 SCp->sc_data_direction = DMA_NONE;
1842 }
1843
1844 switch (SCp->cmnd[0]) {
1845 case REQUEST_SENSE:
1846 /* clear the internal sense magic */
1847 SCp->cmnd[6] = 0;
1848 /* fall through */
1849 default:
1850 /* OK, get it from the command */
1851 switch(SCp->sc_data_direction) {
1852 case DMA_BIDIRECTIONAL:
1853 default:
1854 printk(KERN_ERR "53c700: Unknown command for data direction ");
1855 scsi_print_command(SCp);
1856
1857 move_ins = 0;
1858 break;
1859 case DMA_NONE:
1860 move_ins = 0;
1861 break;
1862 case DMA_FROM_DEVICE:
1863 move_ins = SCRIPT_MOVE_DATA_IN;
1864 break;
1865 case DMA_TO_DEVICE:
1866 move_ins = SCRIPT_MOVE_DATA_OUT;
1867 break;
1868 }
1869 }
1870
1871 /* now build the scatter gather list */
1872 direction = SCp->sc_data_direction;
1873 if(move_ins != 0) {
1874 int i;
1875 int sg_count;
1876 dma_addr_t vPtr = 0;
1877 struct scatterlist *sg;
1878 __u32 count = 0;
1879
1880 sg_count = scsi_dma_map(SCp);
1881 BUG_ON(sg_count < 0);
1882
1883 scsi_for_each_sg(SCp, sg, sg_count, i) {
1884 vPtr = sg_dma_address(sg);
1885 count = sg_dma_len(sg);
1886
1887 slot->SG[i].ins = bS_to_host(move_ins | count);
1888 DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1889 i, count, slot->SG[i].ins, (unsigned long)vPtr));
1890 slot->SG[i].pAddr = bS_to_host(vPtr);
1891 }
1892 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1893 slot->SG[i].pAddr = 0;
1894 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1895 DEBUG((" SETTING %08lx to %x\n",
1896 (&slot->pSG[i].ins),
1897 slot->SG[i].ins));
1898 }
1899 slot->resume_offset = 0;
1900 slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1901 MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1902 NCR_700_start_command(SCp);
1903 return 0;
1904}
1905
1906STATIC DEF_SCSI_QCMD(NCR_700_queuecommand)
1907
1908STATIC int
1909NCR_700_abort(struct scsi_cmnd * SCp)
1910{
1911 struct NCR_700_command_slot *slot;
1912
1913 scmd_printk(KERN_INFO, SCp, "abort command\n");
1914
1915 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1916
1917 if(slot == NULL)
1918 /* no outstanding command to abort */
1919 return SUCCESS;
1920 if(SCp->cmnd[0] == TEST_UNIT_READY) {
1921 /* FIXME: This is because of a problem in the new
1922 * error handler. When it is in error recovery, it
1923 * will send a TUR to a device it thinks may still be
1924 * showing a problem. If the TUR isn't responded to,
1925 * it will abort it and mark the device off line.
1926 * Unfortunately, it does no other error recovery, so
1927 * this would leave us with an outstanding command
1928 * occupying a slot. Rather than allow this to
1929 * happen, we issue a bus reset to force all
1930 * outstanding commands to terminate here. */
1931 NCR_700_internal_bus_reset(SCp->device->host);
1932 /* still drop through and return failed */
1933 }
1934 return FAILED;
1935
1936}
1937
1938STATIC int
1939NCR_700_bus_reset(struct scsi_cmnd * SCp)
1940{
1941 DECLARE_COMPLETION_ONSTACK(complete);
1942 struct NCR_700_Host_Parameters *hostdata =
1943 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1944
1945 scmd_printk(KERN_INFO, SCp,
1946 "New error handler wants BUS reset, cmd %p\n\t", SCp);
1947 scsi_print_command(SCp);
1948
1949 /* In theory, eh_complete should always be null because the
1950 * eh is single threaded, but just in case we're handling a
1951 * reset via sg or something */
1952 spin_lock_irq(SCp->device->host->host_lock);
1953 while (hostdata->eh_complete != NULL) {
1954 spin_unlock_irq(SCp->device->host->host_lock);
1955 msleep_interruptible(100);
1956 spin_lock_irq(SCp->device->host->host_lock);
1957 }
1958
1959 hostdata->eh_complete = &complete;
1960 NCR_700_internal_bus_reset(SCp->device->host);
1961
1962 spin_unlock_irq(SCp->device->host->host_lock);
1963 wait_for_completion(&complete);
1964 spin_lock_irq(SCp->device->host->host_lock);
1965
1966 hostdata->eh_complete = NULL;
1967 /* Revalidate the transport parameters of the failing device */
1968 if(hostdata->fast)
1969 spi_schedule_dv_device(SCp->device);
1970
1971 spin_unlock_irq(SCp->device->host->host_lock);
1972 return SUCCESS;
1973}
1974
1975STATIC int
1976NCR_700_host_reset(struct scsi_cmnd * SCp)
1977{
1978 scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset\n\t");
1979 scsi_print_command(SCp);
1980
1981 spin_lock_irq(SCp->device->host->host_lock);
1982
1983 NCR_700_internal_bus_reset(SCp->device->host);
1984 NCR_700_chip_reset(SCp->device->host);
1985
1986 spin_unlock_irq(SCp->device->host->host_lock);
1987
1988 return SUCCESS;
1989}
1990
1991STATIC void
1992NCR_700_set_period(struct scsi_target *STp, int period)
1993{
1994 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
1995 struct NCR_700_Host_Parameters *hostdata =
1996 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
1997
1998 if(!hostdata->fast)
1999 return;
2000
2001 if(period < hostdata->min_period)
2002 period = hostdata->min_period;
2003
2004 spi_period(STp) = period;
2005 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2006 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2007 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2008}
2009
2010STATIC void
2011NCR_700_set_offset(struct scsi_target *STp, int offset)
2012{
2013 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2014 struct NCR_700_Host_Parameters *hostdata =
2015 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2016 int max_offset = hostdata->chip710
2017 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2018
2019 if(!hostdata->fast)
2020 return;
2021
2022 if(offset > max_offset)
2023 offset = max_offset;
2024
2025 /* if we're currently async, make sure the period is reasonable */
2026 if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2027 spi_period(STp) > 0xff))
2028 spi_period(STp) = hostdata->min_period;
2029
2030 spi_offset(STp) = offset;
2031 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2032 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2033 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2034}
2035
2036STATIC int
2037NCR_700_slave_alloc(struct scsi_device *SDp)
2038{
2039 SDp->hostdata = kzalloc(sizeof(struct NCR_700_Device_Parameters),
2040 GFP_KERNEL);
2041
2042 if (!SDp->hostdata)
2043 return -ENOMEM;
2044
2045 return 0;
2046}
2047
2048STATIC int
2049NCR_700_slave_configure(struct scsi_device *SDp)
2050{
2051 struct NCR_700_Host_Parameters *hostdata =
2052 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2053
2054 /* to do here: allocate memory; build a queue_full list */
2055 if(SDp->tagged_supported) {
2056 scsi_change_queue_depth(SDp, NCR_700_DEFAULT_TAGS);
2057 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2058 }
2059
2060 if(hostdata->fast) {
2061 /* Find the correct offset and period via domain validation */
2062 if (!spi_initial_dv(SDp->sdev_target))
2063 spi_dv_device(SDp);
2064 } else {
2065 spi_offset(SDp->sdev_target) = 0;
2066 spi_period(SDp->sdev_target) = 0;
2067 }
2068 return 0;
2069}
2070
2071STATIC void
2072NCR_700_slave_destroy(struct scsi_device *SDp)
2073{
2074 kfree(SDp->hostdata);
2075 SDp->hostdata = NULL;
2076}
2077
2078static int
2079NCR_700_change_queue_depth(struct scsi_device *SDp, int depth)
2080{
2081 if (depth > NCR_700_MAX_TAGS)
2082 depth = NCR_700_MAX_TAGS;
2083 return scsi_change_queue_depth(SDp, depth);
2084}
2085
2086static ssize_t
2087NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
2088{
2089 struct scsi_device *SDp = to_scsi_device(dev);
2090
2091 return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2092}
2093
2094static struct device_attribute NCR_700_active_tags_attr = {
2095 .attr = {
2096 .name = "active_tags",
2097 .mode = S_IRUGO,
2098 },
2099 .show = NCR_700_show_active_tags,
2100};
2101
2102STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2103 &NCR_700_active_tags_attr,
2104 NULL,
2105};
2106
2107EXPORT_SYMBOL(NCR_700_detect);
2108EXPORT_SYMBOL(NCR_700_release);
2109EXPORT_SYMBOL(NCR_700_intr);
2110
2111static struct spi_function_template NCR_700_transport_functions = {
2112 .set_period = NCR_700_set_period,
2113 .show_period = 1,
2114 .set_offset = NCR_700_set_offset,
2115 .show_offset = 1,
2116};
2117
2118static int __init NCR_700_init(void)
2119{
2120 NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2121 if(!NCR_700_transport_template)
2122 return -ENODEV;
2123 return 0;
2124}
2125
2126static void __exit NCR_700_exit(void)
2127{
2128 spi_release_transport(NCR_700_transport_template);
2129}
2130
2131module_init(NCR_700_init);
2132module_exit(NCR_700_exit);
2133