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be2net: account for skb allocation failures
[linux-2.6.git] / drivers / scsi / 53c700.c
blobf672491774eb61756c2a36f8af3a36496a7ea53c
1 /* -*- mode: c; c-basic-offset: 8 -*- */
2
3 /* NCR (or Symbios) 53c700 and 53c700-66 Driver
4 *
5 * Copyright (C) 2001 by James.Bottomley@HansenPartnership.com
6 **-----------------------------------------------------------------------------
7 **
8 ** This program is free software; you can redistribute it and/or modify
9 ** it under the terms of the GNU General Public License as published by
10 ** the Free Software Foundation; either version 2 of the License, or
11 ** (at your option) any later version.
12 **
13 ** This program is distributed in the hope that it will be useful,
14 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
15 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 ** GNU General Public License for more details.
17 **
18 ** You should have received a copy of the GNU General Public License
19 ** along with this program; if not, write to the Free Software
20 ** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 **
22 **-----------------------------------------------------------------------------
23 */
24
25 /* Notes:
26 *
27 * This driver is designed exclusively for these chips (virtually the
28 * earliest of the scripts engine chips). They need their own drivers
29 * because they are missing so many of the scripts and snazzy register
30 * features of their elder brothers (the 710, 720 and 770).
31 *
32 * The 700 is the lowliest of the line, it can only do async SCSI.
33 * The 700-66 can at least do synchronous SCSI up to 10MHz.
34 *
35 * The 700 chip has no host bus interface logic of its own. However,
36 * it is usually mapped to a location with well defined register
37 * offsets. Therefore, if you can determine the base address and the
38 * irq your board incorporating this chip uses, you can probably use
39 * this driver to run it (although you'll probably have to write a
40 * minimal wrapper for the purpose---see the NCR_D700 driver for
41 * details about how to do this).
42 *
43 *
44 * TODO List:
45 *
46 * 1. Better statistics in the proc fs
47 *
48 * 2. Implement message queue (queues SCSI messages like commands) and make
49 * the abort and device reset functions use them.
50 * */
51
52 /* CHANGELOG
53 *
54 * Version 2.8
55 *
56 * Fixed bad bug affecting tag starvation processing (previously the
57 * driver would hang the system if too many tags starved. Also fixed
58 * bad bug having to do with 10 byte command processing and REQUEST
59 * SENSE (the command would loop forever getting a transfer length
60 * mismatch in the CMD phase).
61 *
62 * Version 2.7
63 *
64 * Fixed scripts problem which caused certain devices (notably CDRWs)
65 * to hang on initial INQUIRY. Updated NCR_700_readl/writel to use
66 * __raw_readl/writel for parisc compatibility (Thomas
67 * Bogendoerfer). Added missing SCp->request_bufflen initialisation
68 * for sense requests (Ryan Bradetich).
69 *
70 * Version 2.6
71 *
72 * Following test of the 64 bit parisc kernel by Richard Hirst,
73 * several problems have now been corrected. Also adds support for
74 * consistent memory allocation.
75 *
76 * Version 2.5
77 *
78 * More Compatibility changes for 710 (now actually works). Enhanced
79 * support for odd clock speeds which constrain SDTR negotiations.
80 * correct cacheline separation for scsi messages and status for
81 * incoherent architectures. Use of the pci mapping functions on
82 * buffers to begin support for 64 bit drivers.
83 *
84 * Version 2.4
85 *
86 * Added support for the 53c710 chip (in 53c700 emulation mode only---no
87 * special 53c710 instructions or registers are used).
88 *
89 * Version 2.3
90 *
91 * More endianness/cache coherency changes.
92 *
93 * Better bad device handling (handles devices lying about tag
94 * queueing support and devices which fail to provide sense data on
95 * contingent allegiance conditions)
96 *
97 * Many thanks to Richard Hirst <rhirst@linuxcare.com> for patiently
98 * debugging this driver on the parisc architecture and suggesting
99 * many improvements and bug fixes.
100 *
101 * Thanks also go to Linuxcare Inc. for providing several PARISC
102 * machines for me to debug the driver on.
103 *
104 * Version 2.2
105 *
106 * Made the driver mem or io mapped; added endian invariance; added
107 * dma cache flushing operations for architectures which need it;
108 * added support for more varied clocking speeds.
109 *
110 * Version 2.1
111 *
112 * Initial modularisation from the D700. See NCR_D700.c for the rest of
113 * the changelog.
114 * */
115 #define NCR_700_VERSION "2.8"
116
117 #include <linux/kernel.h>
118 #include <linux/types.h>
119 #include <linux/string.h>
120 #include <linux/slab.h>
121 #include <linux/ioport.h>
122 #include <linux/delay.h>
123 #include <linux/spinlock.h>
124 #include <linux/completion.h>
125 #include <linux/init.h>
126 #include <linux/proc_fs.h>
127 #include <linux/blkdev.h>
128 #include <linux/module.h>
129 #include <linux/interrupt.h>
130 #include <linux/device.h>
131 #include <asm/dma.h>
132 #include <asm/system.h>
133 #include <asm/io.h>
134 #include <asm/pgtable.h>
135 #include <asm/byteorder.h>
136
137 #include <scsi/scsi.h>
138 #include <scsi/scsi_cmnd.h>
139 #include <scsi/scsi_dbg.h>
140 #include <scsi/scsi_eh.h>
141 #include <scsi/scsi_host.h>
142 #include <scsi/scsi_tcq.h>
143 #include <scsi/scsi_transport.h>
144 #include <scsi/scsi_transport_spi.h>
145
146 #include "53c700.h"
147
148 /* NOTE: For 64 bit drivers there are points in the code where we use
149 * a non dereferenceable pointer to point to a structure in dma-able
150 * memory (which is 32 bits) so that we can use all of the structure
151 * operations but take the address at the end. This macro allows us
152 * to truncate the 64 bit pointer down to 32 bits without the compiler
153 * complaining */
154 #define to32bit(x) ((__u32)((unsigned long)(x)))
155
156 #ifdef NCR_700_DEBUG
157 #define STATIC
158 #else
159 #define STATIC static
160 #endif
161
162 MODULE_AUTHOR("James Bottomley");
163 MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");
164 MODULE_LICENSE("GPL");
165
166 /* This is the script */
167 #include "53c700_d.h"
168
169
170 STATIC int NCR_700_queuecommand(struct Scsi_Host *h, struct scsi_cmnd *);
171 STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt);
172 STATIC int NCR_700_bus_reset(struct scsi_cmnd * SCpnt);
173 STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt);
174 STATIC void NCR_700_chip_setup(struct Scsi_Host *host);
175 STATIC void NCR_700_chip_reset(struct Scsi_Host *host);
176 STATIC int NCR_700_slave_alloc(struct scsi_device *SDpnt);
177 STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt);
178 STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt);
179 static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth, int reason);
180 static int NCR_700_change_queue_type(struct scsi_device *SDpnt, int depth);
181
182 STATIC struct device_attribute *NCR_700_dev_attrs[];
183
184 STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
185
186 static char *NCR_700_phase[] = {
187 "",
188 "after selection",
189 "before command phase",
190 "after command phase",
191 "after status phase",
192 "after data in phase",
193 "after data out phase",
194 "during data phase",
195 };
196
197 static char *NCR_700_condition[] = {
198 "",
199 "NOT MSG_OUT",
200 "UNEXPECTED PHASE",
201 "NOT MSG_IN",
202 "UNEXPECTED MSG",
203 "MSG_IN",
204 "SDTR_MSG RECEIVED",
205 "REJECT_MSG RECEIVED",
206 "DISCONNECT_MSG RECEIVED",
207 "MSG_OUT",
208 "DATA_IN",
209
210 };
211
212 static char *NCR_700_fatal_messages[] = {
213 "unexpected message after reselection",
214 "still MSG_OUT after message injection",
215 "not MSG_IN after selection",
216 "Illegal message length received",
217 };
218
219 static char *NCR_700_SBCL_bits[] = {
220 "IO ",
221 "CD ",
222 "MSG ",
223 "ATN ",
224 "SEL ",
225 "BSY ",
226 "ACK ",
227 "REQ ",
228 };
229
230 static char *NCR_700_SBCL_to_phase[] = {
231 "DATA_OUT",
232 "DATA_IN",
233 "CMD_OUT",
234 "STATE",
235 "ILLEGAL PHASE",
236 "ILLEGAL PHASE",
237 "MSG OUT",
238 "MSG IN",
239 };
240
241 /* This translates the SDTR message offset and period to a value
242 * which can be loaded into the SXFER_REG.
243 *
244 * NOTE: According to SCSI-2, the true transfer period (in ns) is
245 * actually four times this period value */
246 static inline __u8
247 NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
248 __u8 offset, __u8 period)
249 {
250 int XFERP;
251
252 __u8 min_xferp = (hostdata->chip710
253 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
254 __u8 max_offset = (hostdata->chip710
255 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
256
257 if(offset == 0)
258 return 0;
259
260 if(period < hostdata->min_period) {
261 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4);
262 period = hostdata->min_period;
263 }
264 XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
265 if(offset > max_offset) {
266 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
267 offset, max_offset);
268 offset = max_offset;
269 }
270 if(XFERP < min_xferp) {
271 XFERP = min_xferp;
272 }
273 return (offset & 0x0f) | (XFERP & 0x07)<<4;
274 }
275
276 static inline __u8
277 NCR_700_get_SXFER(struct scsi_device *SDp)
278 {
279 struct NCR_700_Host_Parameters *hostdata =
280 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
281
282 return NCR_700_offset_period_to_sxfer(hostdata,
283 spi_offset(SDp->sdev_target),
284 spi_period(SDp->sdev_target));
285 }
286
287 struct Scsi_Host *
288 NCR_700_detect(struct scsi_host_template *tpnt,
289 struct NCR_700_Host_Parameters *hostdata, struct device *dev)
290 {
291 dma_addr_t pScript, pSlots;
292 __u8 *memory;
293 __u32 *script;
294 struct Scsi_Host *host;
295 static int banner = 0;
296 int j;
297
298 if(tpnt->sdev_attrs == NULL)
299 tpnt->sdev_attrs = NCR_700_dev_attrs;
300
301 memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
302 &pScript, GFP_KERNEL);
303 if(memory == NULL) {
304 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
305 return NULL;
306 }
307
308 script = (__u32 *)memory;
309 hostdata->msgin = memory + MSGIN_OFFSET;
310 hostdata->msgout = memory + MSGOUT_OFFSET;
311 hostdata->status = memory + STATUS_OFFSET;
312 hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
313 hostdata->dev = dev;
314
315 pSlots = pScript + SLOTS_OFFSET;
316
317 /* Fill in the missing routines from the host template */
318 tpnt->queuecommand = NCR_700_queuecommand;
319 tpnt->eh_abort_handler = NCR_700_abort;
320 tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
321 tpnt->eh_host_reset_handler = NCR_700_host_reset;
322 tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
323 tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
324 tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
325 tpnt->use_clustering = ENABLE_CLUSTERING;
326 tpnt->slave_configure = NCR_700_slave_configure;
327 tpnt->slave_destroy = NCR_700_slave_destroy;
328 tpnt->slave_alloc = NCR_700_slave_alloc;
329 tpnt->change_queue_depth = NCR_700_change_queue_depth;
330 tpnt->change_queue_type = NCR_700_change_queue_type;
331
332 if(tpnt->name == NULL)
333 tpnt->name = "53c700";
334 if(tpnt->proc_name == NULL)
335 tpnt->proc_name = "53c700";
336
337 host = scsi_host_alloc(tpnt, 4);
338 if (!host)
339 return NULL;
340 memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
341 * NCR_700_COMMAND_SLOTS_PER_HOST);
342 for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
343 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
344 - (unsigned long)&hostdata->slots[0].SG[0]);
345 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
346 if(j == 0)
347 hostdata->free_list = &hostdata->slots[j];
348 else
349 hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
350 hostdata->slots[j].state = NCR_700_SLOT_FREE;
351 }
352
353 for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)
354 script[j] = bS_to_host(SCRIPT[j]);
355
356 /* adjust all labels to be bus physical */
357 for (j = 0; j < PATCHES; j++)
358 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
359 /* now patch up fixed addresses. */
360 script_patch_32(hostdata->dev, script, MessageLocation,
361 pScript + MSGOUT_OFFSET);
362 script_patch_32(hostdata->dev, script, StatusAddress,
363 pScript + STATUS_OFFSET);
364 script_patch_32(hostdata->dev, script, ReceiveMsgAddress,
365 pScript + MSGIN_OFFSET);
366
367 hostdata->script = script;
368 hostdata->pScript = pScript;
369 dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
370 hostdata->state = NCR_700_HOST_FREE;
371 hostdata->cmd = NULL;
372 host->max_id = 8;
373 host->max_lun = NCR_700_MAX_LUNS;
374 BUG_ON(NCR_700_transport_template == NULL);
375 host->transportt = NCR_700_transport_template;
376 host->unique_id = (unsigned long)hostdata->base;
377 hostdata->eh_complete = NULL;
378 host->hostdata[0] = (unsigned long)hostdata;
379 /* kick the chip */
380 NCR_700_writeb(0xff, host, CTEST9_REG);
381 if (hostdata->chip710)
382 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
383 else
384 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
385 hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
386 if (banner == 0) {
387 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
388 banner = 1;
389 }
390 printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
391 hostdata->chip710 ? "53c710" :
392 (hostdata->fast ? "53c700-66" : "53c700"),
393 hostdata->rev, hostdata->differential ?
394 "(Differential)" : "");
395 /* reset the chip */
396 NCR_700_chip_reset(host);
397
398 if (scsi_add_host(host, dev)) {
399 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
400 scsi_host_put(host);
401 return NULL;
402 }
403
404 spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
405 SPI_SIGNAL_SE;
406
407 return host;
408 }
409
410 int
411 NCR_700_release(struct Scsi_Host *host)
412 {
413 struct NCR_700_Host_Parameters *hostdata =
414 (struct NCR_700_Host_Parameters *)host->hostdata[0];
415
416 dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
417 hostdata->script, hostdata->pScript);
418 return 1;
419 }
420
421 static inline __u8
422 NCR_700_identify(int can_disconnect, __u8 lun)
423 {
424 return IDENTIFY_BASE |
425 ((can_disconnect) ? 0x40 : 0) |
426 (lun & NCR_700_LUN_MASK);
427 }
428
429 /*
430 * Function : static int data_residual (Scsi_Host *host)
431 *
432 * Purpose : return residual data count of what's in the chip. If you
433 * really want to know what this function is doing, it's almost a
434 * direct transcription of the algorithm described in the 53c710
435 * guide, except that the DBC and DFIFO registers are only 6 bits
436 * wide on a 53c700.
437 *
438 * Inputs : host - SCSI host */
439 static inline int
440 NCR_700_data_residual (struct Scsi_Host *host) {
441 struct NCR_700_Host_Parameters *hostdata =
442 (struct NCR_700_Host_Parameters *)host->hostdata[0];
443 int count, synchronous = 0;
444 unsigned int ddir;
445
446 if(hostdata->chip710) {
447 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
448 (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
449 } else {
450 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
451 (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
452 }
453
454 if(hostdata->fast)
455 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
456
457 /* get the data direction */
458 ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
459
460 if (ddir) {
461 /* Receive */
462 if (synchronous)
463 count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
464 else
465 if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
466 ++count;
467 } else {
468 /* Send */
469 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
470 if (sstat & SODL_REG_FULL)
471 ++count;
472 if (synchronous && (sstat & SODR_REG_FULL))
473 ++count;
474 }
475 #ifdef NCR_700_DEBUG
476 if(count)
477 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
478 #endif
479 return count;
480 }
481
482 /* print out the SCSI wires and corresponding phase from the SBCL register
483 * in the chip */
484 static inline char *
485 sbcl_to_string(__u8 sbcl)
486 {
487 int i;
488 static char ret[256];
489
490 ret[0]='\0';
491 for(i=0; i<8; i++) {
492 if((1<<i) & sbcl)
493 strcat(ret, NCR_700_SBCL_bits[i]);
494 }
495 strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
496 return ret;
497 }
498
499 static inline __u8
500 bitmap_to_number(__u8 bitmap)
501 {
502 __u8 i;
503
504 for(i=0; i<8 && !(bitmap &(1<<i)); i++)
505 ;
506 return i;
507 }
508
509 /* Pull a slot off the free list */
510 STATIC struct NCR_700_command_slot *
511 find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
512 {
513 struct NCR_700_command_slot *slot = hostdata->free_list;
514
515 if(slot == NULL) {
516 /* sanity check */
517 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
518 printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
519 return NULL;
520 }
521
522 if(slot->state != NCR_700_SLOT_FREE)
523 /* should panic! */
524 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
525
526
527 hostdata->free_list = slot->ITL_forw;
528 slot->ITL_forw = NULL;
529
530
531 /* NOTE: set the state to busy here, not queued, since this
532 * indicates the slot is in use and cannot be run by the IRQ
533 * finish routine. If we cannot queue the command when it
534 * is properly build, we then change to NCR_700_SLOT_QUEUED */
535 slot->state = NCR_700_SLOT_BUSY;
536 slot->flags = 0;
537 hostdata->command_slot_count++;
538
539 return slot;
540 }
541
542 STATIC void
543 free_slot(struct NCR_700_command_slot *slot,
544 struct NCR_700_Host_Parameters *hostdata)
545 {
546 if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
547 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
548 }
549 if(slot->state == NCR_700_SLOT_FREE) {
550 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
551 }
552
553 slot->resume_offset = 0;
554 slot->cmnd = NULL;
555 slot->state = NCR_700_SLOT_FREE;
556 slot->ITL_forw = hostdata->free_list;
557 hostdata->free_list = slot;
558 hostdata->command_slot_count--;
559 }
560
561
562 /* This routine really does very little. The command is indexed on
563 the ITL and (if tagged) the ITLQ lists in _queuecommand */
564 STATIC void
565 save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
566 struct scsi_cmnd *SCp, __u32 dsp)
567 {
568 /* Its just possible that this gets executed twice */
569 if(SCp != NULL) {
570 struct NCR_700_command_slot *slot =
571 (struct NCR_700_command_slot *)SCp->host_scribble;
572
573 slot->resume_offset = dsp;
574 }
575 hostdata->state = NCR_700_HOST_FREE;
576 hostdata->cmd = NULL;
577 }
578
579 STATIC inline void
580 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
581 struct NCR_700_command_slot *slot)
582 {
583 if(SCp->sc_data_direction != DMA_NONE &&
584 SCp->sc_data_direction != DMA_BIDIRECTIONAL)
585 scsi_dma_unmap(SCp);
586 }
587
588 STATIC inline void
589 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
590 struct scsi_cmnd *SCp, int result)
591 {
592 hostdata->state = NCR_700_HOST_FREE;
593 hostdata->cmd = NULL;
594
595 if(SCp != NULL) {
596 struct NCR_700_command_slot *slot =
597 (struct NCR_700_command_slot *)SCp->host_scribble;
598
599 dma_unmap_single(hostdata->dev, slot->pCmd,
600 MAX_COMMAND_SIZE, DMA_TO_DEVICE);
601 if (slot->flags == NCR_700_FLAG_AUTOSENSE) {
602 char *cmnd = NCR_700_get_sense_cmnd(SCp->device);
603 #ifdef NCR_700_DEBUG
604 printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
605 SCp, SCp->cmnd[7], result);
606 scsi_print_sense("53c700", SCp);
607
608 #endif
609 dma_unmap_single(hostdata->dev, slot->dma_handle,
610 SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
611 /* restore the old result if the request sense was
612 * successful */
613 if (result == 0)
614 result = cmnd[7];
615 /* restore the original length */
616 SCp->cmd_len = cmnd[8];
617 } else
618 NCR_700_unmap(hostdata, SCp, slot);
619
620 free_slot(slot, hostdata);
621 #ifdef NCR_700_DEBUG
622 if(NCR_700_get_depth(SCp->device) == 0 ||
623 NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
624 printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
625 NCR_700_get_depth(SCp->device));
626 #endif /* NCR_700_DEBUG */
627 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
628
629 SCp->host_scribble = NULL;
630 SCp->result = result;
631 SCp->scsi_done(SCp);
632 } else {
633 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
634 }
635 }
636
637
638 STATIC void
639 NCR_700_internal_bus_reset(struct Scsi_Host *host)
640 {
641 /* Bus reset */
642 NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
643 udelay(50);
644 NCR_700_writeb(0, host, SCNTL1_REG);
645
646 }
647
648 STATIC void
649 NCR_700_chip_setup(struct Scsi_Host *host)
650 {
651 struct NCR_700_Host_Parameters *hostdata =
652 (struct NCR_700_Host_Parameters *)host->hostdata[0];
653 __u8 min_period;
654 __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
655
656 if(hostdata->chip710) {
657 __u8 burst_disable = 0;
658 __u8 burst_length = 0;
659
660 switch (hostdata->burst_length) {
661 case 1:
662 burst_length = BURST_LENGTH_1;
663 break;
664 case 2:
665 burst_length = BURST_LENGTH_2;
666 break;
667 case 4:
668 burst_length = BURST_LENGTH_4;
669 break;
670 case 8:
671 burst_length = BURST_LENGTH_8;
672 break;
673 default:
674 burst_disable = BURST_DISABLE;
675 break;
676 }
677 hostdata->dcntl_extra |= COMPAT_700_MODE;
678
679 NCR_700_writeb(hostdata->dcntl_extra, host, DCNTL_REG);
680 NCR_700_writeb(burst_length | hostdata->dmode_extra,
681 host, DMODE_710_REG);
682 NCR_700_writeb(burst_disable | hostdata->ctest7_extra |
683 (hostdata->differential ? DIFF : 0),
684 host, CTEST7_REG);
685 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
686 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
687 | AUTO_ATN, host, SCNTL0_REG);
688 } else {
689 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
690 host, DMODE_700_REG);
691 NCR_700_writeb(hostdata->differential ?
692 DIFF : 0, host, CTEST7_REG);
693 if(hostdata->fast) {
694 /* this is for 700-66, does nothing on 700 */
695 NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
696 | GENERATE_RECEIVE_PARITY, host,
697 CTEST8_REG);
698 } else {
699 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
700 | PARITY | AUTO_ATN, host, SCNTL0_REG);
701 }
702 }
703
704 NCR_700_writeb(1 << host->this_id, host, SCID_REG);
705 NCR_700_writeb(0, host, SBCL_REG);
706 NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
707
708 NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
709 | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
710
711 NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
712 NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
713 if(hostdata->clock > 75) {
714 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
715 /* do the best we can, but the async clock will be out
716 * of spec: sync divider 2, async divider 3 */
717 DEBUG(("53c700: sync 2 async 3\n"));
718 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
719 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
720 hostdata->sync_clock = hostdata->clock/2;
721 } else if(hostdata->clock > 50 && hostdata->clock <= 75) {
722 /* sync divider 1.5, async divider 3 */
723 DEBUG(("53c700: sync 1.5 async 3\n"));
724 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
725 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
726 hostdata->sync_clock = hostdata->clock*2;
727 hostdata->sync_clock /= 3;
728
729 } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
730 /* sync divider 1, async divider 2 */
731 DEBUG(("53c700: sync 1 async 2\n"));
732 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
733 NCR_700_writeb(ASYNC_DIV_2_0 | hostdata->dcntl_extra, host, DCNTL_REG);
734 hostdata->sync_clock = hostdata->clock;
735 } else if(hostdata->clock > 25 && hostdata->clock <=37) {
736 /* sync divider 1, async divider 1.5 */
737 DEBUG(("53c700: sync 1 async 1.5\n"));
738 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
739 NCR_700_writeb(ASYNC_DIV_1_5 | hostdata->dcntl_extra, host, DCNTL_REG);
740 hostdata->sync_clock = hostdata->clock;
741 } else {
742 DEBUG(("53c700: sync 1 async 1\n"));
743 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
744 NCR_700_writeb(ASYNC_DIV_1_0 | hostdata->dcntl_extra, host, DCNTL_REG);
745 /* sync divider 1, async divider 1 */
746 hostdata->sync_clock = hostdata->clock;
747 }
748 /* Calculate the actual minimum period that can be supported
749 * by our synchronous clock speed. See the 710 manual for
750 * exact details of this calculation which is based on a
751 * setting of the SXFER register */
752 min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
753 hostdata->min_period = NCR_700_MIN_PERIOD;
754 if(min_period > NCR_700_MIN_PERIOD)
755 hostdata->min_period = min_period;
756 }
757
758 STATIC void
759 NCR_700_chip_reset(struct Scsi_Host *host)
760 {
761 struct NCR_700_Host_Parameters *hostdata =
762 (struct NCR_700_Host_Parameters *)host->hostdata[0];
763 if(hostdata->chip710) {
764 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
765 udelay(100);
766
767 NCR_700_writeb(0, host, ISTAT_REG);
768 } else {
769 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
770 udelay(100);
771
772 NCR_700_writeb(0, host, DCNTL_REG);
773 }
774
775 mdelay(1000);
776
777 NCR_700_chip_setup(host);
778 }
779
780 /* The heart of the message processing engine is that the instruction
781 * immediately after the INT is the normal case (and so must be CLEAR
782 * ACK). If we want to do something else, we call that routine in
783 * scripts and set temp to be the normal case + 8 (skipping the CLEAR
784 * ACK) so that the routine returns correctly to resume its activity
785 * */
786 STATIC __u32
787 process_extended_message(struct Scsi_Host *host,
788 struct NCR_700_Host_Parameters *hostdata,
789 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
790 {
791 __u32 resume_offset = dsp, temp = dsp + 8;
792 __u8 pun = 0xff, lun = 0xff;
793
794 if(SCp != NULL) {
795 pun = SCp->device->id;
796 lun = SCp->device->lun;
797 }
798
799 switch(hostdata->msgin[2]) {
800 case A_SDTR_MSG:
801 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
802 struct scsi_target *starget = SCp->device->sdev_target;
803 __u8 period = hostdata->msgin[3];
804 __u8 offset = hostdata->msgin[4];
805
806 if(offset == 0 || period == 0) {
807 offset = 0;
808 period = 0;
809 }
810
811 spi_offset(starget) = offset;
812 spi_period(starget) = period;
813
814 if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
815 spi_display_xfer_agreement(starget);
816 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
817 }
818
819 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
820 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
821
822 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
823 host, SXFER_REG);
824
825 } else {
826 /* SDTR message out of the blue, reject it */
827 shost_printk(KERN_WARNING, host,
828 "Unexpected SDTR msg\n");
829 hostdata->msgout[0] = A_REJECT_MSG;
830 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
831 script_patch_16(hostdata->dev, hostdata->script,
832 MessageCount, 1);
833 /* SendMsgOut returns, so set up the return
834 * address */
835 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
836 }
837 break;
838
839 case A_WDTR_MSG:
840 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
841 host->host_no, pun, lun);
842 hostdata->msgout[0] = A_REJECT_MSG;
843 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
844 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
845 1);
846 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
847
848 break;
849
850 default:
851 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
852 host->host_no, pun, lun,
853 NCR_700_phase[(dsps & 0xf00) >> 8]);
854 spi_print_msg(hostdata->msgin);
855 printk("\n");
856 /* just reject it */
857 hostdata->msgout[0] = A_REJECT_MSG;
858 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
859 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
860 1);
861 /* SendMsgOut returns, so set up the return
862 * address */
863 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
864 }
865 NCR_700_writel(temp, host, TEMP_REG);
866 return resume_offset;
867 }
868
869 STATIC __u32
870 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
871 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
872 {
873 /* work out where to return to */
874 __u32 temp = dsp + 8, resume_offset = dsp;
875 __u8 pun = 0xff, lun = 0xff;
876
877 if(SCp != NULL) {
878 pun = SCp->device->id;
879 lun = SCp->device->lun;
880 }
881
882 #ifdef NCR_700_DEBUG
883 printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
884 NCR_700_phase[(dsps & 0xf00) >> 8]);
885 spi_print_msg(hostdata->msgin);
886 printk("\n");
887 #endif
888
889 switch(hostdata->msgin[0]) {
890
891 case A_EXTENDED_MSG:
892 resume_offset = process_extended_message(host, hostdata, SCp,
893 dsp, dsps);
894 break;
895
896 case A_REJECT_MSG:
897 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
898 /* Rejected our sync negotiation attempt */
899 spi_period(SCp->device->sdev_target) =
900 spi_offset(SCp->device->sdev_target) = 0;
901 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
902 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
903 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
904 /* rejected our first simple tag message */
905 scmd_printk(KERN_WARNING, SCp,
906 "Rejected first tag queue attempt, turning off tag queueing\n");
907 /* we're done negotiating */
908 NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
909 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
910 SCp->device->tagged_supported = 0;
911 scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
912 } else {
913 shost_printk(KERN_WARNING, host,
914 "(%d:%d) Unexpected REJECT Message %s\n",
915 pun, lun,
916 NCR_700_phase[(dsps & 0xf00) >> 8]);
917 /* however, just ignore it */
918 }
919 break;
920
921 case A_PARITY_ERROR_MSG:
922 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
923 pun, lun);
924 NCR_700_internal_bus_reset(host);
925 break;
926 case A_SIMPLE_TAG_MSG:
927 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
928 pun, lun, hostdata->msgin[1],
929 NCR_700_phase[(dsps & 0xf00) >> 8]);
930 /* just ignore it */
931 break;
932 default:
933 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
934 host->host_no, pun, lun,
935 NCR_700_phase[(dsps & 0xf00) >> 8]);
936
937 spi_print_msg(hostdata->msgin);
938 printk("\n");
939 /* just reject it */
940 hostdata->msgout[0] = A_REJECT_MSG;
941 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
942 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
943 1);
944 /* SendMsgOut returns, so set up the return
945 * address */
946 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
947
948 break;
949 }
950 NCR_700_writel(temp, host, TEMP_REG);
951 /* set us up to receive another message */
952 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
953 return resume_offset;
954 }
955
956 STATIC __u32
957 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
958 struct Scsi_Host *host,
959 struct NCR_700_Host_Parameters *hostdata)
960 {
961 __u32 resume_offset = 0;
962 __u8 pun = 0xff, lun=0xff;
963
964 if(SCp != NULL) {
965 pun = SCp->device->id;
966 lun = SCp->device->lun;
967 }
968
969 if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
970 DEBUG((" COMMAND COMPLETE, status=%02x\n",
971 hostdata->status[0]));
972 /* OK, if TCQ still under negotiation, we now know it works */
973 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
974 NCR_700_set_tag_neg_state(SCp->device,
975 NCR_700_FINISHED_TAG_NEGOTIATION);
976
977 /* check for contingent allegiance contitions */
978 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
979 status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
980 struct NCR_700_command_slot *slot =
981 (struct NCR_700_command_slot *)SCp->host_scribble;
982 if(slot->flags == NCR_700_FLAG_AUTOSENSE) {
983 /* OOPS: bad device, returning another
984 * contingent allegiance condition */
985 scmd_printk(KERN_ERR, SCp,
986 "broken device is looping in contingent allegiance: ignoring\n");
987 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
988 } else {
989 char *cmnd =
990 NCR_700_get_sense_cmnd(SCp->device);
991 #ifdef NCR_DEBUG
992 scsi_print_command(SCp);
993 printk(" cmd %p has status %d, requesting sense\n",
994 SCp, hostdata->status[0]);
995 #endif
996 /* we can destroy the command here
997 * because the contingent allegiance
998 * condition will cause a retry which
999 * will re-copy the command from the
1000 * saved data_cmnd. We also unmap any
1001 * data associated with the command
1002 * here */
1003 NCR_700_unmap(hostdata, SCp, slot);
1004 dma_unmap_single(hostdata->dev, slot->pCmd,
1005 MAX_COMMAND_SIZE,
1006 DMA_TO_DEVICE);
1007
1008 cmnd[0] = REQUEST_SENSE;
1009 cmnd[1] = (SCp->device->lun & 0x7) << 5;
1010 cmnd[2] = 0;
1011 cmnd[3] = 0;
1012 cmnd[4] = SCSI_SENSE_BUFFERSIZE;
1013 cmnd[5] = 0;
1014 /* Here's a quiet hack: the
1015 * REQUEST_SENSE command is six bytes,
1016 * so store a flag indicating that
1017 * this was an internal sense request
1018 * and the original status at the end
1019 * of the command */
1020 cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1021 cmnd[7] = hostdata->status[0];
1022 cmnd[8] = SCp->cmd_len;
1023 SCp->cmd_len = 6; /* command length for
1024 * REQUEST_SENSE */
1025 slot->pCmd = dma_map_single(hostdata->dev, cmnd, MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1026 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1027 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | SCSI_SENSE_BUFFERSIZE);
1028 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1029 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1030 slot->SG[1].pAddr = 0;
1031 slot->resume_offset = hostdata->pScript;
1032 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1033 dma_cache_sync(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1034
1035 /* queue the command for reissue */
1036 slot->state = NCR_700_SLOT_QUEUED;
1037 slot->flags = NCR_700_FLAG_AUTOSENSE;
1038 hostdata->state = NCR_700_HOST_FREE;
1039 hostdata->cmd = NULL;
1040 }
1041 } else {
1042 // Currently rely on the mid layer evaluation
1043 // of the tag queuing capability
1044 //
1045 //if(status_byte(hostdata->status[0]) == GOOD &&
1046 // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1047 // /* Piggy back the tag queueing support
1048 // * on this command */
1049 // dma_sync_single_for_cpu(hostdata->dev,
1050 // slot->dma_handle,
1051 // SCp->request_bufflen,
1052 // DMA_FROM_DEVICE);
1053 // if(((char *)SCp->request_buffer)[7] & 0x02) {
1054 // scmd_printk(KERN_INFO, SCp,
1055 // "Enabling Tag Command Queuing\n");
1056 // hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1057 // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1058 // } else {
1059 // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1060 // hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1061 // }
1062 //}
1063 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1064 }
1065 } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1066 __u8 i = (dsps & 0xf00) >> 8;
1067
1068 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1069 NCR_700_phase[i],
1070 sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1071 scmd_printk(KERN_ERR, SCp, " len = %d, cmd =",
1072 SCp->cmd_len);
1073 scsi_print_command(SCp);
1074
1075 NCR_700_internal_bus_reset(host);
1076 } else if((dsps & 0xfffff000) == A_FATAL) {
1077 int i = (dsps & 0xfff);
1078
1079 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1080 host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1081 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1082 printk(KERN_ERR " msg begins %02x %02x\n",
1083 hostdata->msgin[0], hostdata->msgin[1]);
1084 }
1085 NCR_700_internal_bus_reset(host);
1086 } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1087 #ifdef NCR_700_DEBUG
1088 __u8 i = (dsps & 0xf00) >> 8;
1089
1090 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1091 host->host_no, pun, lun,
1092 i, NCR_700_phase[i]);
1093 #endif
1094 save_for_reselection(hostdata, SCp, dsp);
1095
1096 } else if(dsps == A_RESELECTION_IDENTIFIED) {
1097 __u8 lun;
1098 struct NCR_700_command_slot *slot;
1099 __u8 reselection_id = hostdata->reselection_id;
1100 struct scsi_device *SDp;
1101
1102 lun = hostdata->msgin[0] & 0x1f;
1103
1104 hostdata->reselection_id = 0xff;
1105 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1106 host->host_no, reselection_id, lun));
1107 /* clear the reselection indicator */
1108 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1109 if(unlikely(SDp == NULL)) {
1110 printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1111 host->host_no, reselection_id, lun);
1112 BUG();
1113 }
1114 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1115 struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1116 if(unlikely(SCp == NULL)) {
1117 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1118 host->host_no, reselection_id, lun, hostdata->msgin[2]);
1119 BUG();
1120 }
1121
1122 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1123 DDEBUG(KERN_DEBUG, SDp,
1124 "reselection is tag %d, slot %p(%d)\n",
1125 hostdata->msgin[2], slot, slot->tag);
1126 } else {
1127 struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1128 if(unlikely(SCp == NULL)) {
1129 sdev_printk(KERN_ERR, SDp,
1130 "no saved request for untagged cmd\n");
1131 BUG();
1132 }
1133 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1134 }
1135
1136 if(slot == NULL) {
1137 printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1138 host->host_no, reselection_id, lun,
1139 hostdata->msgin[0], hostdata->msgin[1],
1140 hostdata->msgin[2]);
1141 } else {
1142 if(hostdata->state != NCR_700_HOST_BUSY)
1143 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1144 host->host_no);
1145 resume_offset = slot->resume_offset;
1146 hostdata->cmd = slot->cmnd;
1147
1148 /* re-patch for this command */
1149 script_patch_32_abs(hostdata->dev, hostdata->script,
1150 CommandAddress, slot->pCmd);
1151 script_patch_16(hostdata->dev, hostdata->script,
1152 CommandCount, slot->cmnd->cmd_len);
1153 script_patch_32_abs(hostdata->dev, hostdata->script,
1154 SGScriptStartAddress,
1155 to32bit(&slot->pSG[0].ins));
1156
1157 /* Note: setting SXFER only works if we're
1158 * still in the MESSAGE phase, so it is vital
1159 * that ACK is still asserted when we process
1160 * the reselection message. The resume offset
1161 * should therefore always clear ACK */
1162 NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1163 host, SXFER_REG);
1164 dma_cache_sync(hostdata->dev, hostdata->msgin,
1165 MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1166 dma_cache_sync(hostdata->dev, hostdata->msgout,
1167 MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1168 /* I'm just being paranoid here, the command should
1169 * already have been flushed from the cache */
1170 dma_cache_sync(hostdata->dev, slot->cmnd->cmnd,
1171 slot->cmnd->cmd_len, DMA_TO_DEVICE);
1172
1173
1174
1175 }
1176 } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1177
1178 /* This section is full of debugging code because I've
1179 * never managed to reach it. I think what happens is
1180 * that, because the 700 runs with selection
1181 * interrupts enabled the whole time that we take a
1182 * selection interrupt before we manage to get to the
1183 * reselected script interrupt */
1184
1185 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1186 struct NCR_700_command_slot *slot;
1187
1188 /* Take out our own ID */
1189 reselection_id &= ~(1<<host->this_id);
1190
1191 /* I've never seen this happen, so keep this as a printk rather
1192 * than a debug */
1193 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1194 host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1195
1196 {
1197 /* FIXME: DEBUGGING CODE */
1198 __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1199 int i;
1200
1201 for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1202 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1203 && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1204 break;
1205 }
1206 printk(KERN_INFO "IDENTIFIED SG segment as being %08x in slot %p, cmd %p, slot->resume_offset=%08x\n", SG, &hostdata->slots[i], hostdata->slots[i].cmnd, hostdata->slots[i].resume_offset);
1207 SCp = hostdata->slots[i].cmnd;
1208 }
1209
1210 if(SCp != NULL) {
1211 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1212 /* change slot from busy to queued to redo command */
1213 slot->state = NCR_700_SLOT_QUEUED;
1214 }
1215 hostdata->cmd = NULL;
1216
1217 if(reselection_id == 0) {
1218 if(hostdata->reselection_id == 0xff) {
1219 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1220 return 0;
1221 } else {
1222 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1223 host->host_no);
1224 reselection_id = hostdata->reselection_id;
1225 }
1226 } else {
1227
1228 /* convert to real ID */
1229 reselection_id = bitmap_to_number(reselection_id);
1230 }
1231 hostdata->reselection_id = reselection_id;
1232 /* just in case we have a stale simple tag message, clear it */
1233 hostdata->msgin[1] = 0;
1234 dma_cache_sync(hostdata->dev, hostdata->msgin,
1235 MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1236 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1237 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1238 } else {
1239 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1240 }
1241 } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1242 /* we've just disconnected from the bus, do nothing since
1243 * a return here will re-run the queued command slot
1244 * that may have been interrupted by the initial selection */
1245 DEBUG((" SELECTION COMPLETED\n"));
1246 } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1247 resume_offset = process_message(host, hostdata, SCp,
1248 dsp, dsps);
1249 } else if((dsps & 0xfffff000) == 0) {
1250 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1251 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1252 host->host_no, pun, lun, NCR_700_condition[i],
1253 NCR_700_phase[j], dsp - hostdata->pScript);
1254 if(SCp != NULL) {
1255 struct scatterlist *sg;
1256
1257 scsi_print_command(SCp);
1258 scsi_for_each_sg(SCp, sg, scsi_sg_count(SCp) + 1, i) {
1259 printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, sg->length, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].ins, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].pAddr);
1260 }
1261 }
1262 NCR_700_internal_bus_reset(host);
1263 } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1264 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1265 host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1266 resume_offset = dsp;
1267 } else {
1268 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1269 host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1270 NCR_700_internal_bus_reset(host);
1271 }
1272 return resume_offset;
1273 }
1274
1275 /* We run the 53c700 with selection interrupts always enabled. This
1276 * means that the chip may be selected as soon as the bus frees. On a
1277 * busy bus, this can be before the scripts engine finishes its
1278 * processing. Therefore, part of the selection processing has to be
1279 * to find out what the scripts engine is doing and complete the
1280 * function if necessary (i.e. process the pending disconnect or save
1281 * the interrupted initial selection */
1282 STATIC inline __u32
1283 process_selection(struct Scsi_Host *host, __u32 dsp)
1284 {
1285 __u8 id = 0; /* Squash compiler warning */
1286 int count = 0;
1287 __u32 resume_offset = 0;
1288 struct NCR_700_Host_Parameters *hostdata =
1289 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1290 struct scsi_cmnd *SCp = hostdata->cmd;
1291 __u8 sbcl;
1292
1293 for(count = 0; count < 5; count++) {
1294 id = NCR_700_readb(host, hostdata->chip710 ?
1295 CTEST9_REG : SFBR_REG);
1296
1297 /* Take out our own ID */
1298 id &= ~(1<<host->this_id);
1299 if(id != 0)
1300 break;
1301 udelay(5);
1302 }
1303 sbcl = NCR_700_readb(host, SBCL_REG);
1304 if((sbcl & SBCL_IO) == 0) {
1305 /* mark as having been selected rather than reselected */
1306 id = 0xff;
1307 } else {
1308 /* convert to real ID */
1309 hostdata->reselection_id = id = bitmap_to_number(id);
1310 DEBUG(("scsi%d: Reselected by %d\n",
1311 host->host_no, id));
1312 }
1313 if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1314 struct NCR_700_command_slot *slot =
1315 (struct NCR_700_command_slot *)SCp->host_scribble;
1316 DEBUG((" ID %d WARNING: RESELECTION OF BUSY HOST, saving cmd %p, slot %p, addr %x [%04x], resume %x!\n", id, hostdata->cmd, slot, dsp, dsp - hostdata->pScript, resume_offset));
1317
1318 switch(dsp - hostdata->pScript) {
1319 case Ent_Disconnect1:
1320 case Ent_Disconnect2:
1321 save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1322 break;
1323 case Ent_Disconnect3:
1324 case Ent_Disconnect4:
1325 save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1326 break;
1327 case Ent_Disconnect5:
1328 case Ent_Disconnect6:
1329 save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1330 break;
1331 case Ent_Disconnect7:
1332 case Ent_Disconnect8:
1333 save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1334 break;
1335 case Ent_Finish1:
1336 case Ent_Finish2:
1337 process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1338 break;
1339
1340 default:
1341 slot->state = NCR_700_SLOT_QUEUED;
1342 break;
1343 }
1344 }
1345 hostdata->state = NCR_700_HOST_BUSY;
1346 hostdata->cmd = NULL;
1347 /* clear any stale simple tag message */
1348 hostdata->msgin[1] = 0;
1349 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1350 DMA_BIDIRECTIONAL);
1351
1352 if(id == 0xff) {
1353 /* Selected as target, Ignore */
1354 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1355 } else if(hostdata->tag_negotiated & (1<<id)) {
1356 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1357 } else {
1358 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1359 }
1360 return resume_offset;
1361 }
1362
1363 static inline void
1364 NCR_700_clear_fifo(struct Scsi_Host *host) {
1365 const struct NCR_700_Host_Parameters *hostdata
1366 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1367 if(hostdata->chip710) {
1368 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1369 } else {
1370 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1371 }
1372 }
1373
1374 static inline void
1375 NCR_700_flush_fifo(struct Scsi_Host *host) {
1376 const struct NCR_700_Host_Parameters *hostdata
1377 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1378 if(hostdata->chip710) {
1379 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1380 udelay(10);
1381 NCR_700_writeb(0, host, CTEST8_REG);
1382 } else {
1383 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1384 udelay(10);
1385 NCR_700_writeb(0, host, DFIFO_REG);
1386 }
1387 }
1388
1389
1390 /* The queue lock with interrupts disabled must be held on entry to
1391 * this function */
1392 STATIC int
1393 NCR_700_start_command(struct scsi_cmnd *SCp)
1394 {
1395 struct NCR_700_command_slot *slot =
1396 (struct NCR_700_command_slot *)SCp->host_scribble;
1397 struct NCR_700_Host_Parameters *hostdata =
1398 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1399 __u16 count = 1; /* for IDENTIFY message */
1400
1401 if(hostdata->state != NCR_700_HOST_FREE) {
1402 /* keep this inside the lock to close the race window where
1403 * the running command finishes on another CPU while we don't
1404 * change the state to queued on this one */
1405 slot->state = NCR_700_SLOT_QUEUED;
1406
1407 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1408 SCp->device->host->host_no, slot->cmnd, slot));
1409 return 0;
1410 }
1411 hostdata->state = NCR_700_HOST_BUSY;
1412 hostdata->cmd = SCp;
1413 slot->state = NCR_700_SLOT_BUSY;
1414 /* keep interrupts disabled until we have the command correctly
1415 * set up so we cannot take a selection interrupt */
1416
1417 hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&
1418 slot->flags != NCR_700_FLAG_AUTOSENSE),
1419 SCp->device->lun);
1420 /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1421 * if the negotiated transfer parameters still hold, so
1422 * always renegotiate them */
1423 if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||
1424 slot->flags == NCR_700_FLAG_AUTOSENSE) {
1425 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1426 }
1427
1428 /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1429 * If a contingent allegiance condition exists, the device
1430 * will refuse all tags, so send the request sense as untagged
1431 * */
1432 if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1433 && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&
1434 slot->flags != NCR_700_FLAG_AUTOSENSE)) {
1435 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
1436 }
1437
1438 if(hostdata->fast &&
1439 NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1440 count += spi_populate_sync_msg(&hostdata->msgout[count],
1441 spi_period(SCp->device->sdev_target),
1442 spi_offset(SCp->device->sdev_target));
1443 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1444 }
1445
1446 script_patch_16(hostdata->dev, hostdata->script, MessageCount, count);
1447
1448
1449 script_patch_ID(hostdata->dev, hostdata->script,
1450 Device_ID, 1<<scmd_id(SCp));
1451
1452 script_patch_32_abs(hostdata->dev, hostdata->script, CommandAddress,
1453 slot->pCmd);
1454 script_patch_16(hostdata->dev, hostdata->script, CommandCount,
1455 SCp->cmd_len);
1456 /* finally plumb the beginning of the SG list into the script
1457 * */
1458 script_patch_32_abs(hostdata->dev, hostdata->script,
1459 SGScriptStartAddress, to32bit(&slot->pSG[0].ins));
1460 NCR_700_clear_fifo(SCp->device->host);
1461
1462 if(slot->resume_offset == 0)
1463 slot->resume_offset = hostdata->pScript;
1464 /* now perform all the writebacks and invalidates */
1465 dma_cache_sync(hostdata->dev, hostdata->msgout, count, DMA_TO_DEVICE);
1466 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1467 DMA_FROM_DEVICE);
1468 dma_cache_sync(hostdata->dev, SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1469 dma_cache_sync(hostdata->dev, hostdata->status, 1, DMA_FROM_DEVICE);
1470
1471 /* set the synchronous period/offset */
1472 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1473 SCp->device->host, SXFER_REG);
1474 NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1475 NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1476
1477 return 1;
1478 }
1479
1480 irqreturn_t
1481 NCR_700_intr(int irq, void *dev_id)
1482 {
1483 struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1484 struct NCR_700_Host_Parameters *hostdata =
1485 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1486 __u8 istat;
1487 __u32 resume_offset = 0;
1488 __u8 pun = 0xff, lun = 0xff;
1489 unsigned long flags;
1490 int handled = 0;
1491
1492 /* Use the host lock to serialise access to the 53c700
1493 * hardware. Note: In future, we may need to take the queue
1494 * lock to enter the done routines. When that happens, we
1495 * need to ensure that for this driver, the host lock and the
1496 * queue lock point to the same thing. */
1497 spin_lock_irqsave(host->host_lock, flags);
1498 if((istat = NCR_700_readb(host, ISTAT_REG))
1499 & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1500 __u32 dsps;
1501 __u8 sstat0 = 0, dstat = 0;
1502 __u32 dsp;
1503 struct scsi_cmnd *SCp = hostdata->cmd;
1504 enum NCR_700_Host_State state;
1505
1506 handled = 1;
1507 state = hostdata->state;
1508 SCp = hostdata->cmd;
1509
1510 if(istat & SCSI_INT_PENDING) {
1511 udelay(10);
1512
1513 sstat0 = NCR_700_readb(host, SSTAT0_REG);
1514 }
1515
1516 if(istat & DMA_INT_PENDING) {
1517 udelay(10);
1518
1519 dstat = NCR_700_readb(host, DSTAT_REG);
1520 }
1521
1522 dsps = NCR_700_readl(host, DSPS_REG);
1523 dsp = NCR_700_readl(host, DSP_REG);
1524
1525 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1526 host->host_no, istat, sstat0, dstat,
1527 (dsp - (__u32)(hostdata->pScript))/4,
1528 dsp, dsps));
1529
1530 if(SCp != NULL) {
1531 pun = SCp->device->id;
1532 lun = SCp->device->lun;
1533 }
1534
1535 if(sstat0 & SCSI_RESET_DETECTED) {
1536 struct scsi_device *SDp;
1537 int i;
1538
1539 hostdata->state = NCR_700_HOST_BUSY;
1540
1541 printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1542 host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1543
1544 scsi_report_bus_reset(host, 0);
1545
1546 /* clear all the negotiated parameters */
1547 __shost_for_each_device(SDp, host)
1548 NCR_700_clear_flag(SDp, ~0);
1549
1550 /* clear all the slots and their pending commands */
1551 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1552 struct scsi_cmnd *SCp;
1553 struct NCR_700_command_slot *slot =
1554 &hostdata->slots[i];
1555
1556 if(slot->state == NCR_700_SLOT_FREE)
1557 continue;
1558
1559 SCp = slot->cmnd;
1560 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1561 slot, SCp);
1562 free_slot(slot, hostdata);
1563 SCp->host_scribble = NULL;
1564 NCR_700_set_depth(SCp->device, 0);
1565 /* NOTE: deadlock potential here: we
1566 * rely on mid-layer guarantees that
1567 * scsi_done won't try to issue the
1568 * command again otherwise we'll
1569 * deadlock on the
1570 * hostdata->state_lock */
1571 SCp->result = DID_RESET << 16;
1572 SCp->scsi_done(SCp);
1573 }
1574 mdelay(25);
1575 NCR_700_chip_setup(host);
1576
1577 hostdata->state = NCR_700_HOST_FREE;
1578 hostdata->cmd = NULL;
1579 /* signal back if this was an eh induced reset */
1580 if(hostdata->eh_complete != NULL)
1581 complete(hostdata->eh_complete);
1582 goto out_unlock;
1583 } else if(sstat0 & SELECTION_TIMEOUT) {
1584 DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1585 host->host_no, pun, lun));
1586 NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1587 } else if(sstat0 & PHASE_MISMATCH) {
1588 struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1589 (struct NCR_700_command_slot *)SCp->host_scribble;
1590
1591 if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1592 /* It wants to reply to some part of
1593 * our message */
1594 #ifdef NCR_700_DEBUG
1595 __u32 temp = NCR_700_readl(host, TEMP_REG);
1596 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1597 printk("scsi%d (%d:%d) PHASE MISMATCH IN SEND MESSAGE %d remain, return %p[%04x], phase %s\n", host->host_no, pun, lun, count, (void *)temp, temp - hostdata->pScript, sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1598 #endif
1599 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1600 } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1601 dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1602 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1603 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1604 int residual = NCR_700_data_residual(host);
1605 int i;
1606 #ifdef NCR_700_DEBUG
1607 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1608
1609 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1610 host->host_no, pun, lun,
1611 SGcount, data_transfer);
1612 scsi_print_command(SCp);
1613 if(residual) {
1614 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1615 host->host_no, pun, lun,
1616 SGcount, data_transfer, residual);
1617 }
1618 #endif
1619 data_transfer += residual;
1620
1621 if(data_transfer != 0) {
1622 int count;
1623 __u32 pAddr;
1624
1625 SGcount--;
1626
1627 count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1628 DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1629 slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1630 slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1631 pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1632 pAddr += (count - data_transfer);
1633 #ifdef NCR_700_DEBUG
1634 if(pAddr != naddr) {
1635 printk("scsi%d (%d:%d) transfer mismatch pAddr=%lx, naddr=%lx, data_transfer=%d, residual=%d\n", host->host_no, pun, lun, (unsigned long)pAddr, (unsigned long)naddr, data_transfer, residual);
1636 }
1637 #endif
1638 slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1639 }
1640 /* set the executed moves to nops */
1641 for(i=0; i<SGcount; i++) {
1642 slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1643 slot->SG[i].pAddr = 0;
1644 }
1645 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1646 /* and pretend we disconnected after
1647 * the command phase */
1648 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1649 /* make sure all the data is flushed */
1650 NCR_700_flush_fifo(host);
1651 } else {
1652 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1653 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1654 host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1655 NCR_700_internal_bus_reset(host);
1656 }
1657
1658 } else if(sstat0 & SCSI_GROSS_ERROR) {
1659 printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1660 host->host_no, pun, lun);
1661 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1662 } else if(sstat0 & PARITY_ERROR) {
1663 printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1664 host->host_no, pun, lun);
1665 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1666 } else if(dstat & SCRIPT_INT_RECEIVED) {
1667 DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1668 host->host_no, pun, lun));
1669 resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1670 } else if(dstat & (ILGL_INST_DETECTED)) {
1671 printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1672 " Please email James.Bottomley@HansenPartnership.com with the details\n",
1673 host->host_no, pun, lun,
1674 dsp, dsp - hostdata->pScript);
1675 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1676 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1677 printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1678 host->host_no, pun, lun, dstat);
1679 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1680 }
1681
1682
1683 /* NOTE: selection interrupt processing MUST occur
1684 * after script interrupt processing to correctly cope
1685 * with the case where we process a disconnect and
1686 * then get reselected before we process the
1687 * disconnection */
1688 if(sstat0 & SELECTED) {
1689 /* FIXME: It currently takes at least FOUR
1690 * interrupts to complete a command that
1691 * disconnects: one for the disconnect, one
1692 * for the reselection, one to get the
1693 * reselection data and one to complete the
1694 * command. If we guess the reselected
1695 * command here and prepare it, we only need
1696 * to get a reselection data interrupt if we
1697 * guessed wrongly. Since the interrupt
1698 * overhead is much greater than the command
1699 * setup, this would be an efficient
1700 * optimisation particularly as we probably
1701 * only have one outstanding command on a
1702 * target most of the time */
1703
1704 resume_offset = process_selection(host, dsp);
1705
1706 }
1707
1708 }
1709
1710 if(resume_offset) {
1711 if(hostdata->state != NCR_700_HOST_BUSY) {
1712 printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1713 host->host_no, resume_offset, resume_offset - hostdata->pScript);
1714 hostdata->state = NCR_700_HOST_BUSY;
1715 }
1716
1717 DEBUG(("Attempting to resume at %x\n", resume_offset));
1718 NCR_700_clear_fifo(host);
1719 NCR_700_writel(resume_offset, host, DSP_REG);
1720 }
1721 /* There is probably a technical no-no about this: If we're a
1722 * shared interrupt and we got this interrupt because the
1723 * other device needs servicing not us, we're still going to
1724 * check our queued commands here---of course, there shouldn't
1725 * be any outstanding.... */
1726 if(hostdata->state == NCR_700_HOST_FREE) {
1727 int i;
1728
1729 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1730 /* fairness: always run the queue from the last
1731 * position we left off */
1732 int j = (i + hostdata->saved_slot_position)
1733 % NCR_700_COMMAND_SLOTS_PER_HOST;
1734
1735 if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1736 continue;
1737 if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1738 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1739 host->host_no, &hostdata->slots[j],
1740 hostdata->slots[j].cmnd));
1741 hostdata->saved_slot_position = j + 1;
1742 }
1743
1744 break;
1745 }
1746 }
1747 out_unlock:
1748 spin_unlock_irqrestore(host->host_lock, flags);
1749 return IRQ_RETVAL(handled);
1750 }
1751
1752 static int
1753 NCR_700_queuecommand_lck(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1754 {
1755 struct NCR_700_Host_Parameters *hostdata =
1756 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1757 __u32 move_ins;
1758 enum dma_data_direction direction;
1759 struct NCR_700_command_slot *slot;
1760
1761 if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1762 /* We're over our allocation, this should never happen
1763 * since we report the max allocation to the mid layer */
1764 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1765 return 1;
1766 }
1767 /* check for untagged commands. We cannot have any outstanding
1768 * commands if we accept them. Commands could be untagged because:
1769 *
1770 * - The tag negotiated bitmap is clear
1771 * - The blk layer sent and untagged command
1772 */
1773 if(NCR_700_get_depth(SCp->device) != 0
1774 && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1775 || !blk_rq_tagged(SCp->request))) {
1776 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1777 NCR_700_get_depth(SCp->device));
1778 return SCSI_MLQUEUE_DEVICE_BUSY;
1779 }
1780 if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1781 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1782 NCR_700_get_depth(SCp->device));
1783 return SCSI_MLQUEUE_DEVICE_BUSY;
1784 }
1785 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1786
1787 /* begin the command here */
1788 /* no need to check for NULL, test for command_slot_count above
1789 * ensures a slot is free */
1790 slot = find_empty_slot(hostdata);
1791
1792 slot->cmnd = SCp;
1793
1794 SCp->scsi_done = done;
1795 SCp->host_scribble = (unsigned char *)slot;
1796 SCp->SCp.ptr = NULL;
1797 SCp->SCp.buffer = NULL;
1798
1799 #ifdef NCR_700_DEBUG
1800 printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1801 scsi_print_command(SCp);
1802 #endif
1803 if(blk_rq_tagged(SCp->request)
1804 && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1805 && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1806 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1807 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1808 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1809 }
1810
1811 /* here we may have to process an untagged command. The gate
1812 * above ensures that this will be the only one outstanding,
1813 * so clear the tag negotiated bit.
1814 *
1815 * FIXME: This will royally screw up on multiple LUN devices
1816 * */
1817 if(!blk_rq_tagged(SCp->request)
1818 && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1819 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1820 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1821 }
1822
1823 if((hostdata->tag_negotiated &(1<<scmd_id(SCp)))
1824 && scsi_get_tag_type(SCp->device)) {
1825 slot->tag = SCp->request->tag;
1826 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1827 slot->tag, slot);
1828 } else {
1829 slot->tag = SCSI_NO_TAG;
1830 /* must populate current_cmnd for scsi_find_tag to work */
1831 SCp->device->current_cmnd = SCp;
1832 }
1833 /* sanity check: some of the commands generated by the mid-layer
1834 * have an eccentric idea of their sc_data_direction */
1835 if(!scsi_sg_count(SCp) && !scsi_bufflen(SCp) &&
1836 SCp->sc_data_direction != DMA_NONE) {
1837 #ifdef NCR_700_DEBUG
1838 printk("53c700: Command");
1839 scsi_print_command(SCp);
1840 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1841 #endif
1842 SCp->sc_data_direction = DMA_NONE;
1843 }
1844
1845 switch (SCp->cmnd[0]) {
1846 case REQUEST_SENSE:
1847 /* clear the internal sense magic */
1848 SCp->cmnd[6] = 0;
1849 /* fall through */
1850 default:
1851 /* OK, get it from the command */
1852 switch(SCp->sc_data_direction) {
1853 case DMA_BIDIRECTIONAL:
1854 default:
1855 printk(KERN_ERR "53c700: Unknown command for data direction ");
1856 scsi_print_command(SCp);
1857
1858 move_ins = 0;
1859 break;
1860 case DMA_NONE:
1861 move_ins = 0;
1862 break;
1863 case DMA_FROM_DEVICE:
1864 move_ins = SCRIPT_MOVE_DATA_IN;
1865 break;
1866 case DMA_TO_DEVICE:
1867 move_ins = SCRIPT_MOVE_DATA_OUT;
1868 break;
1869 }
1870 }
1871
1872 /* now build the scatter gather list */
1873 direction = SCp->sc_data_direction;
1874 if(move_ins != 0) {
1875 int i;
1876 int sg_count;
1877 dma_addr_t vPtr = 0;
1878 struct scatterlist *sg;
1879 __u32 count = 0;
1880
1881 sg_count = scsi_dma_map(SCp);
1882 BUG_ON(sg_count < 0);
1883
1884 scsi_for_each_sg(SCp, sg, sg_count, i) {
1885 vPtr = sg_dma_address(sg);
1886 count = sg_dma_len(sg);
1887
1888 slot->SG[i].ins = bS_to_host(move_ins | count);
1889 DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1890 i, count, slot->SG[i].ins, (unsigned long)vPtr));
1891 slot->SG[i].pAddr = bS_to_host(vPtr);
1892 }
1893 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1894 slot->SG[i].pAddr = 0;
1895 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1896 DEBUG((" SETTING %08lx to %x\n",
1897 (&slot->pSG[i].ins),
1898 slot->SG[i].ins));
1899 }
1900 slot->resume_offset = 0;
1901 slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1902 MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1903 NCR_700_start_command(SCp);
1904 return 0;
1905 }
1906
1907 STATIC DEF_SCSI_QCMD(NCR_700_queuecommand)
1908
1909 STATIC int
1910 NCR_700_abort(struct scsi_cmnd * SCp)
1911 {
1912 struct NCR_700_command_slot *slot;
1913
1914 scmd_printk(KERN_INFO, SCp,
1915 "New error handler wants to abort command\n\t");
1916 scsi_print_command(SCp);
1917
1918 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1919
1920 if(slot == NULL)
1921 /* no outstanding command to abort */
1922 return SUCCESS;
1923 if(SCp->cmnd[0] == TEST_UNIT_READY) {
1924 /* FIXME: This is because of a problem in the new
1925 * error handler. When it is in error recovery, it
1926 * will send a TUR to a device it thinks may still be
1927 * showing a problem. If the TUR isn't responded to,
1928 * it will abort it and mark the device off line.
1929 * Unfortunately, it does no other error recovery, so
1930 * this would leave us with an outstanding command
1931 * occupying a slot. Rather than allow this to
1932 * happen, we issue a bus reset to force all
1933 * outstanding commands to terminate here. */
1934 NCR_700_internal_bus_reset(SCp->device->host);
1935 /* still drop through and return failed */
1936 }
1937 return FAILED;
1938
1939 }
1940
1941 STATIC int
1942 NCR_700_bus_reset(struct scsi_cmnd * SCp)
1943 {
1944 DECLARE_COMPLETION_ONSTACK(complete);
1945 struct NCR_700_Host_Parameters *hostdata =
1946 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1947
1948 scmd_printk(KERN_INFO, SCp,
1949 "New error handler wants BUS reset, cmd %p\n\t", SCp);
1950 scsi_print_command(SCp);
1951
1952 /* In theory, eh_complete should always be null because the
1953 * eh is single threaded, but just in case we're handling a
1954 * reset via sg or something */
1955 spin_lock_irq(SCp->device->host->host_lock);
1956 while (hostdata->eh_complete != NULL) {
1957 spin_unlock_irq(SCp->device->host->host_lock);
1958 msleep_interruptible(100);
1959 spin_lock_irq(SCp->device->host->host_lock);
1960 }
1961
1962 hostdata->eh_complete = &complete;
1963 NCR_700_internal_bus_reset(SCp->device->host);
1964
1965 spin_unlock_irq(SCp->device->host->host_lock);
1966 wait_for_completion(&complete);
1967 spin_lock_irq(SCp->device->host->host_lock);
1968
1969 hostdata->eh_complete = NULL;
1970 /* Revalidate the transport parameters of the failing device */
1971 if(hostdata->fast)
1972 spi_schedule_dv_device(SCp->device);
1973
1974 spin_unlock_irq(SCp->device->host->host_lock);
1975 return SUCCESS;
1976 }
1977
1978 STATIC int
1979 NCR_700_host_reset(struct scsi_cmnd * SCp)
1980 {
1981 scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset\n\t");
1982 scsi_print_command(SCp);
1983
1984 spin_lock_irq(SCp->device->host->host_lock);
1985
1986 NCR_700_internal_bus_reset(SCp->device->host);
1987 NCR_700_chip_reset(SCp->device->host);
1988
1989 spin_unlock_irq(SCp->device->host->host_lock);
1990
1991 return SUCCESS;
1992 }
1993
1994 STATIC void
1995 NCR_700_set_period(struct scsi_target *STp, int period)
1996 {
1997 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
1998 struct NCR_700_Host_Parameters *hostdata =
1999 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2000
2001 if(!hostdata->fast)
2002 return;
2003
2004 if(period < hostdata->min_period)
2005 period = hostdata->min_period;
2006
2007 spi_period(STp) = period;
2008 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2009 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2010 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2011 }
2012
2013 STATIC void
2014 NCR_700_set_offset(struct scsi_target *STp, int offset)
2015 {
2016 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2017 struct NCR_700_Host_Parameters *hostdata =
2018 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2019 int max_offset = hostdata->chip710
2020 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2021
2022 if(!hostdata->fast)
2023 return;
2024
2025 if(offset > max_offset)
2026 offset = max_offset;
2027
2028 /* if we're currently async, make sure the period is reasonable */
2029 if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2030 spi_period(STp) > 0xff))
2031 spi_period(STp) = hostdata->min_period;
2032
2033 spi_offset(STp) = offset;
2034 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2035 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2036 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2037 }
2038
2039 STATIC int
2040 NCR_700_slave_alloc(struct scsi_device *SDp)
2041 {
2042 SDp->hostdata = kzalloc(sizeof(struct NCR_700_Device_Parameters),
2043 GFP_KERNEL);
2044
2045 if (!SDp->hostdata)
2046 return -ENOMEM;
2047
2048 return 0;
2049 }
2050
2051 STATIC int
2052 NCR_700_slave_configure(struct scsi_device *SDp)
2053 {
2054 struct NCR_700_Host_Parameters *hostdata =
2055 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2056
2057 /* to do here: allocate memory; build a queue_full list */
2058 if(SDp->tagged_supported) {
2059 scsi_set_tag_type(SDp, MSG_ORDERED_TAG);
2060 scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS);
2061 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2062 } else {
2063 /* initialise to default depth */
2064 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
2065 }
2066 if(hostdata->fast) {
2067 /* Find the correct offset and period via domain validation */
2068 if (!spi_initial_dv(SDp->sdev_target))
2069 spi_dv_device(SDp);
2070 } else {
2071 spi_offset(SDp->sdev_target) = 0;
2072 spi_period(SDp->sdev_target) = 0;
2073 }
2074 return 0;
2075 }
2076
2077 STATIC void
2078 NCR_700_slave_destroy(struct scsi_device *SDp)
2079 {
2080 kfree(SDp->hostdata);
2081 SDp->hostdata = NULL;
2082 }
2083
2084 static int
2085 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth, int reason)
2086 {
2087 if (reason != SCSI_QDEPTH_DEFAULT)
2088 return -EOPNOTSUPP;
2089
2090 if (depth > NCR_700_MAX_TAGS)
2091 depth = NCR_700_MAX_TAGS;
2092
2093 scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth);
2094 return depth;
2095 }
2096
2097 static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
2098 {
2099 int change_tag = ((tag_type ==0 && scsi_get_tag_type(SDp) != 0)
2100 || (tag_type != 0 && scsi_get_tag_type(SDp) == 0));
2101 struct NCR_700_Host_Parameters *hostdata =
2102 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2103
2104 scsi_set_tag_type(SDp, tag_type);
2105
2106 /* We have a global (per target) flag to track whether TCQ is
2107 * enabled, so we'll be turning it off for the entire target here.
2108 * our tag algorithm will fail if we mix tagged and untagged commands,
2109 * so quiesce the device before doing this */
2110 if (change_tag)
2111 scsi_target_quiesce(SDp->sdev_target);
2112
2113 if (!tag_type) {
2114 /* shift back to the default unqueued number of commands
2115 * (the user can still raise this) */
2116 scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun);
2117 hostdata->tag_negotiated &= ~(1 << sdev_id(SDp));
2118 } else {
2119 /* Here, we cleared the negotiation flag above, so this
2120 * will force the driver to renegotiate */
2121 scsi_activate_tcq(SDp, SDp->queue_depth);
2122 if (change_tag)
2123 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2124 }
2125 if (change_tag)
2126 scsi_target_resume(SDp->sdev_target);
2127
2128 return tag_type;
2129 }
2130
2131 static ssize_t
2132 NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
2133 {
2134 struct scsi_device *SDp = to_scsi_device(dev);
2135
2136 return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2137 }
2138
2139 static struct device_attribute NCR_700_active_tags_attr = {
2140 .attr = {
2141 .name = "active_tags",
2142 .mode = S_IRUGO,
2143 },
2144 .show = NCR_700_show_active_tags,
2145 };
2146
2147 STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2148 &NCR_700_active_tags_attr,
2149 NULL,
2150 };
2151
2152 EXPORT_SYMBOL(NCR_700_detect);
2153 EXPORT_SYMBOL(NCR_700_release);
2154 EXPORT_SYMBOL(NCR_700_intr);
2155
2156 static struct spi_function_template NCR_700_transport_functions = {
2157 .set_period = NCR_700_set_period,
2158 .show_period = 1,
2159 .set_offset = NCR_700_set_offset,
2160 .show_offset = 1,
2161 };
2162
2163 static int __init NCR_700_init(void)
2164 {
2165 NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2166 if(!NCR_700_transport_template)
2167 return -ENODEV;
2168 return 0;
2169 }
2170
2171 static void __exit NCR_700_exit(void)
2172 {
2173 spi_release_transport(NCR_700_transport_template);
2174 }
2175
2176 module_init(NCR_700_init);
2177 module_exit(NCR_700_exit);
2178
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