blob: 71ff3fbfce12559d161fed31be5d6d1f90101677 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* -*- 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117#include <linux/kernel.h>
118#include <linux/types.h>
119#include <linux/string.h>
120#include <linux/ioport.h>
121#include <linux/delay.h>
122#include <linux/spinlock.h>
123#include <linux/completion.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124#include <linux/init.h>
125#include <linux/proc_fs.h>
126#include <linux/blkdev.h>
127#include <linux/module.h>
128#include <linux/interrupt.h>
Jeff Garzik017560f2005-10-24 18:04:36 -0400129#include <linux/device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130#include <asm/dma.h>
131#include <asm/system.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_cmnd *, void (*done)(struct scsi_cmnd *));
170STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt);
171STATIC int NCR_700_bus_reset(struct scsi_cmnd * SCpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172STATIC 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);
James Bottomley0f13fc02006-06-29 13:02:11 -0400175STATIC int NCR_700_slave_alloc(struct scsi_device *SDpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt);
177STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt);
178static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth);
179static int NCR_700_change_queue_type(struct scsi_device *SDpnt, int depth);
180
181STATIC struct device_attribute *NCR_700_dev_attrs[];
182
183STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
184
185static char *NCR_700_phase[] = {
186 "",
187 "after selection",
188 "before command phase",
189 "after command phase",
190 "after status phase",
191 "after data in phase",
192 "after data out phase",
193 "during data phase",
194};
195
196static char *NCR_700_condition[] = {
197 "",
198 "NOT MSG_OUT",
199 "UNEXPECTED PHASE",
200 "NOT MSG_IN",
201 "UNEXPECTED MSG",
202 "MSG_IN",
203 "SDTR_MSG RECEIVED",
204 "REJECT_MSG RECEIVED",
205 "DISCONNECT_MSG RECEIVED",
206 "MSG_OUT",
207 "DATA_IN",
208
209};
210
211static char *NCR_700_fatal_messages[] = {
212 "unexpected message after reselection",
213 "still MSG_OUT after message injection",
214 "not MSG_IN after selection",
215 "Illegal message length received",
216};
217
218static char *NCR_700_SBCL_bits[] = {
219 "IO ",
220 "CD ",
221 "MSG ",
222 "ATN ",
223 "SEL ",
224 "BSY ",
225 "ACK ",
226 "REQ ",
227};
228
229static char *NCR_700_SBCL_to_phase[] = {
230 "DATA_OUT",
231 "DATA_IN",
232 "CMD_OUT",
233 "STATE",
234 "ILLEGAL PHASE",
235 "ILLEGAL PHASE",
236 "MSG OUT",
237 "MSG IN",
238};
239
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240/* This translates the SDTR message offset and period to a value
241 * which can be loaded into the SXFER_REG.
242 *
243 * NOTE: According to SCSI-2, the true transfer period (in ns) is
244 * actually four times this period value */
245static inline __u8
246NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
247 __u8 offset, __u8 period)
248{
249 int XFERP;
250
251 __u8 min_xferp = (hostdata->chip710
252 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
253 __u8 max_offset = (hostdata->chip710
254 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
255
256 if(offset == 0)
257 return 0;
258
259 if(period < hostdata->min_period) {
Matthew Wilcox6ea3c0b2006-02-07 07:54:46 -0700260 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 period = hostdata->min_period;
262 }
263 XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
264 if(offset > max_offset) {
265 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
266 offset, max_offset);
267 offset = max_offset;
268 }
269 if(XFERP < min_xferp) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 XFERP = min_xferp;
271 }
272 return (offset & 0x0f) | (XFERP & 0x07)<<4;
273}
274
275static inline __u8
276NCR_700_get_SXFER(struct scsi_device *SDp)
277{
278 struct NCR_700_Host_Parameters *hostdata =
279 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
280
281 return NCR_700_offset_period_to_sxfer(hostdata,
282 spi_offset(SDp->sdev_target),
283 spi_period(SDp->sdev_target));
284}
285
286struct Scsi_Host *
287NCR_700_detect(struct scsi_host_template *tpnt,
288 struct NCR_700_Host_Parameters *hostdata, struct device *dev)
289{
290 dma_addr_t pScript, pSlots;
291 __u8 *memory;
292 __u32 *script;
293 struct Scsi_Host *host;
294 static int banner = 0;
295 int j;
296
297 if(tpnt->sdev_attrs == NULL)
298 tpnt->sdev_attrs = NCR_700_dev_attrs;
299
300 memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
301 &pScript, GFP_KERNEL);
302 if(memory == NULL) {
303 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
304 return NULL;
305 }
306
307 script = (__u32 *)memory;
308 hostdata->msgin = memory + MSGIN_OFFSET;
309 hostdata->msgout = memory + MSGOUT_OFFSET;
310 hostdata->status = memory + STATUS_OFFSET;
311 /* all of these offsets are L1_CACHE_BYTES separated. It is fatal
312 * if this isn't sufficient separation to avoid dma flushing issues */
Ralf Baechlef67637e2006-12-06 20:38:54 -0800313 BUG_ON(!dma_is_consistent(hostdata->dev, pScript) && L1_CACHE_BYTES < dma_get_cache_alignment());
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
315 hostdata->dev = dev;
Tobias Klauser6391a112006-06-08 22:23:48 -0700316
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 pSlots = pScript + SLOTS_OFFSET;
318
319 /* Fill in the missing routines from the host template */
320 tpnt->queuecommand = NCR_700_queuecommand;
321 tpnt->eh_abort_handler = NCR_700_abort;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
323 tpnt->eh_host_reset_handler = NCR_700_host_reset;
324 tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
325 tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
326 tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
327 tpnt->use_clustering = ENABLE_CLUSTERING;
328 tpnt->slave_configure = NCR_700_slave_configure;
329 tpnt->slave_destroy = NCR_700_slave_destroy;
James Bottomley0f13fc02006-06-29 13:02:11 -0400330 tpnt->slave_alloc = NCR_700_slave_alloc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 tpnt->change_queue_depth = NCR_700_change_queue_depth;
332 tpnt->change_queue_type = NCR_700_change_queue_type;
Tobias Klauser6391a112006-06-08 22:23:48 -0700333
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 if(tpnt->name == NULL)
335 tpnt->name = "53c700";
336 if(tpnt->proc_name == NULL)
337 tpnt->proc_name = "53c700";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
339 host = scsi_host_alloc(tpnt, 4);
340 if (!host)
341 return NULL;
342 memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
343 * NCR_700_COMMAND_SLOTS_PER_HOST);
Tobias Klauser6391a112006-06-08 22:23:48 -0700344 for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
346 - (unsigned long)&hostdata->slots[0].SG[0]);
347 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
348 if(j == 0)
349 hostdata->free_list = &hostdata->slots[j];
350 else
351 hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
352 hostdata->slots[j].state = NCR_700_SLOT_FREE;
353 }
354
Tobias Klauser6391a112006-06-08 22:23:48 -0700355 for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 script[j] = bS_to_host(SCRIPT[j]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357
358 /* adjust all labels to be bus physical */
Tobias Klauser6391a112006-06-08 22:23:48 -0700359 for (j = 0; j < PATCHES; j++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 /* now patch up fixed addresses. */
Ralf Baechled3fa72e2006-12-06 20:38:56 -0800362 script_patch_32(hostdata->dev, script, MessageLocation,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 pScript + MSGOUT_OFFSET);
Ralf Baechled3fa72e2006-12-06 20:38:56 -0800364 script_patch_32(hostdata->dev, script, StatusAddress,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 pScript + STATUS_OFFSET);
Ralf Baechled3fa72e2006-12-06 20:38:56 -0800366 script_patch_32(hostdata->dev, script, ReceiveMsgAddress,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 pScript + MSGIN_OFFSET);
368
369 hostdata->script = script;
370 hostdata->pScript = pScript;
371 dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
372 hostdata->state = NCR_700_HOST_FREE;
373 hostdata->cmd = NULL;
Hannes Reinecke2b89dad2006-05-23 10:29:28 +0200374 host->max_id = 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 host->max_lun = NCR_700_MAX_LUNS;
376 BUG_ON(NCR_700_transport_template == NULL);
377 host->transportt = NCR_700_transport_template;
56fece22005-04-03 03:57:48 -0600378 host->unique_id = (unsigned long)hostdata->base;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 hostdata->eh_complete = NULL;
380 host->hostdata[0] = (unsigned long)hostdata;
381 /* kick the chip */
382 NCR_700_writeb(0xff, host, CTEST9_REG);
Tobias Klauser6391a112006-06-08 22:23:48 -0700383 if (hostdata->chip710)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
385 else
386 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
387 hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
Tobias Klauser6391a112006-06-08 22:23:48 -0700388 if (banner == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
390 banner = 1;
391 }
392 printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
Tobias Klauser6391a112006-06-08 22:23:48 -0700393 hostdata->chip710 ? "53c710" :
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 (hostdata->fast ? "53c700-66" : "53c700"),
395 hostdata->rev, hostdata->differential ?
396 "(Differential)" : "");
397 /* reset the chip */
398 NCR_700_chip_reset(host);
399
400 if (scsi_add_host(host, dev)) {
401 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
402 scsi_host_put(host);
403 return NULL;
404 }
405
406 spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
407 SPI_SIGNAL_SE;
408
409 return host;
410}
411
412int
413NCR_700_release(struct Scsi_Host *host)
414{
415 struct NCR_700_Host_Parameters *hostdata =
416 (struct NCR_700_Host_Parameters *)host->hostdata[0];
417
418 dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
419 hostdata->script, hostdata->pScript);
420 return 1;
421}
422
423static inline __u8
424NCR_700_identify(int can_disconnect, __u8 lun)
425{
426 return IDENTIFY_BASE |
427 ((can_disconnect) ? 0x40 : 0) |
428 (lun & NCR_700_LUN_MASK);
429}
430
431/*
432 * Function : static int data_residual (Scsi_Host *host)
433 *
434 * Purpose : return residual data count of what's in the chip. If you
435 * really want to know what this function is doing, it's almost a
436 * direct transcription of the algorithm described in the 53c710
437 * guide, except that the DBC and DFIFO registers are only 6 bits
438 * wide on a 53c700.
439 *
440 * Inputs : host - SCSI host */
441static inline int
442NCR_700_data_residual (struct Scsi_Host *host) {
443 struct NCR_700_Host_Parameters *hostdata =
444 (struct NCR_700_Host_Parameters *)host->hostdata[0];
445 int count, synchronous = 0;
446 unsigned int ddir;
447
448 if(hostdata->chip710) {
449 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
450 (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
451 } else {
452 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
453 (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
454 }
455
456 if(hostdata->fast)
457 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
458
459 /* get the data direction */
460 ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
461
462 if (ddir) {
463 /* Receive */
464 if (synchronous)
465 count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
466 else
467 if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
468 ++count;
469 } else {
470 /* Send */
471 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
472 if (sstat & SODL_REG_FULL)
473 ++count;
474 if (synchronous && (sstat & SODR_REG_FULL))
475 ++count;
476 }
477#ifdef NCR_700_DEBUG
478 if(count)
479 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
480#endif
481 return count;
482}
483
484/* print out the SCSI wires and corresponding phase from the SBCL register
485 * in the chip */
486static inline char *
487sbcl_to_string(__u8 sbcl)
488{
489 int i;
490 static char ret[256];
491
492 ret[0]='\0';
493 for(i=0; i<8; i++) {
494 if((1<<i) & sbcl)
495 strcat(ret, NCR_700_SBCL_bits[i]);
496 }
497 strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
498 return ret;
499}
500
501static inline __u8
502bitmap_to_number(__u8 bitmap)
503{
504 __u8 i;
505
506 for(i=0; i<8 && !(bitmap &(1<<i)); i++)
507 ;
508 return i;
509}
510
511/* Pull a slot off the free list */
512STATIC struct NCR_700_command_slot *
513find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
514{
515 struct NCR_700_command_slot *slot = hostdata->free_list;
516
517 if(slot == NULL) {
518 /* sanity check */
519 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
520 printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
521 return NULL;
522 }
523
524 if(slot->state != NCR_700_SLOT_FREE)
525 /* should panic! */
526 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
527
528
529 hostdata->free_list = slot->ITL_forw;
530 slot->ITL_forw = NULL;
531
532
533 /* NOTE: set the state to busy here, not queued, since this
534 * indicates the slot is in use and cannot be run by the IRQ
535 * finish routine. If we cannot queue the command when it
536 * is properly build, we then change to NCR_700_SLOT_QUEUED */
537 slot->state = NCR_700_SLOT_BUSY;
James Bottomley67d59df2006-06-13 21:31:19 -0500538 slot->flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 hostdata->command_slot_count++;
540
541 return slot;
542}
543
544STATIC void
545free_slot(struct NCR_700_command_slot *slot,
546 struct NCR_700_Host_Parameters *hostdata)
547{
548 if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
549 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
550 }
551 if(slot->state == NCR_700_SLOT_FREE) {
552 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
553 }
554
555 slot->resume_offset = 0;
556 slot->cmnd = NULL;
557 slot->state = NCR_700_SLOT_FREE;
558 slot->ITL_forw = hostdata->free_list;
559 hostdata->free_list = slot;
560 hostdata->command_slot_count--;
561}
562
563
564/* This routine really does very little. The command is indexed on
565 the ITL and (if tagged) the ITLQ lists in _queuecommand */
566STATIC void
567save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
568 struct scsi_cmnd *SCp, __u32 dsp)
569{
570 /* Its just possible that this gets executed twice */
571 if(SCp != NULL) {
572 struct NCR_700_command_slot *slot =
573 (struct NCR_700_command_slot *)SCp->host_scribble;
574
575 slot->resume_offset = dsp;
576 }
577 hostdata->state = NCR_700_HOST_FREE;
578 hostdata->cmd = NULL;
579}
580
581STATIC inline void
582NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
583 struct NCR_700_command_slot *slot)
584{
585 if(SCp->sc_data_direction != DMA_NONE &&
FUJITA Tomonori3258a4d2007-05-14 19:12:55 +0900586 SCp->sc_data_direction != DMA_BIDIRECTIONAL)
587 scsi_dma_unmap(SCp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588}
589
590STATIC inline void
591NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
592 struct scsi_cmnd *SCp, int result)
593{
594 hostdata->state = NCR_700_HOST_FREE;
595 hostdata->cmd = NULL;
596
597 if(SCp != NULL) {
598 struct NCR_700_command_slot *slot =
599 (struct NCR_700_command_slot *)SCp->host_scribble;
600
James Bottomley0f13fc02006-06-29 13:02:11 -0400601 dma_unmap_single(hostdata->dev, slot->pCmd,
602 sizeof(SCp->cmnd), DMA_TO_DEVICE);
James Bottomley67d59df2006-06-13 21:31:19 -0500603 if (slot->flags == NCR_700_FLAG_AUTOSENSE) {
James Bottomley0f13fc02006-06-29 13:02:11 -0400604 char *cmnd = NCR_700_get_sense_cmnd(SCp->device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605#ifdef NCR_700_DEBUG
606 printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
607 SCp, SCp->cmnd[7], result);
608 scsi_print_sense("53c700", SCp);
609
610#endif
James Bottomley67d59df2006-06-13 21:31:19 -0500611 dma_unmap_single(hostdata->dev, slot->dma_handle, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 /* restore the old result if the request sense was
613 * successful */
James Bottomleyc603d042006-12-01 11:25:12 -0600614 if (result == 0)
James Bottomley0f13fc02006-06-29 13:02:11 -0400615 result = cmnd[7];
James Bottomleyc603d042006-12-01 11:25:12 -0600616 /* restore the original length */
617 SCp->cmd_len = cmnd[8];
James Bottomley67d59df2006-06-13 21:31:19 -0500618 } else
James Bottomley0f13fc02006-06-29 13:02:11 -0400619 NCR_700_unmap(hostdata, SCp, slot);
James Bottomley67d59df2006-06-13 21:31:19 -0500620
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 free_slot(slot, hostdata);
622#ifdef NCR_700_DEBUG
623 if(NCR_700_get_depth(SCp->device) == 0 ||
624 NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
625 printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
626 NCR_700_get_depth(SCp->device));
627#endif /* NCR_700_DEBUG */
628 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
629
630 SCp->host_scribble = NULL;
631 SCp->result = result;
632 SCp->scsi_done(SCp);
633 } else {
634 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
635 }
636}
637
638
639STATIC void
640NCR_700_internal_bus_reset(struct Scsi_Host *host)
641{
642 /* Bus reset */
643 NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
644 udelay(50);
645 NCR_700_writeb(0, host, SCNTL1_REG);
646
647}
648
649STATIC void
650NCR_700_chip_setup(struct Scsi_Host *host)
651{
652 struct NCR_700_Host_Parameters *hostdata =
653 (struct NCR_700_Host_Parameters *)host->hostdata[0];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 __u8 min_period;
655 __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
656
657 if(hostdata->chip710) {
Thomas Bogendoerferf67a9c12006-12-25 21:30:08 +0100658 __u8 burst_disable = 0;
659 __u8 burst_length = 0;
660
661 switch (hostdata->burst_length) {
662 case 1:
663 burst_length = BURST_LENGTH_1;
664 break;
665 case 2:
666 burst_length = BURST_LENGTH_2;
667 break;
668 case 4:
669 burst_length = BURST_LENGTH_4;
670 break;
671 case 8:
672 burst_length = BURST_LENGTH_8;
673 break;
674 default:
675 burst_disable = BURST_DISABLE;
676 break;
677 }
Kars de Jong63273132007-06-17 14:47:05 +0200678 hostdata->dcntl_extra |= COMPAT_700_MODE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679
Kars de Jong63273132007-06-17 14:47:05 +0200680 NCR_700_writeb(hostdata->dcntl_extra, host, DCNTL_REG);
Thomas Bogendoerferf67a9c12006-12-25 21:30:08 +0100681 NCR_700_writeb(burst_length | hostdata->dmode_extra,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 host, DMODE_710_REG);
Kars de Jong63273132007-06-17 14:47:05 +0200683 NCR_700_writeb(burst_disable | hostdata->ctest7_extra |
684 (hostdata->differential ? DIFF : 0),
685 host, CTEST7_REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
687 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
688 | AUTO_ATN, host, SCNTL0_REG);
689 } else {
690 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
691 host, DMODE_700_REG);
692 NCR_700_writeb(hostdata->differential ?
693 DIFF : 0, host, CTEST7_REG);
694 if(hostdata->fast) {
695 /* this is for 700-66, does nothing on 700 */
696 NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
697 | GENERATE_RECEIVE_PARITY, host,
698 CTEST8_REG);
699 } else {
700 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
701 | PARITY | AUTO_ATN, host, SCNTL0_REG);
702 }
703 }
704
705 NCR_700_writeb(1 << host->this_id, host, SCID_REG);
706 NCR_700_writeb(0, host, SBCL_REG);
707 NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
708
709 NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
710 | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
711
712 NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
713 NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
714 if(hostdata->clock > 75) {
715 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
716 /* do the best we can, but the async clock will be out
717 * of spec: sync divider 2, async divider 3 */
718 DEBUG(("53c700: sync 2 async 3\n"));
719 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
Kars de Jong63273132007-06-17 14:47:05 +0200720 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 hostdata->sync_clock = hostdata->clock/2;
722 } else if(hostdata->clock > 50 && hostdata->clock <= 75) {
723 /* sync divider 1.5, async divider 3 */
724 DEBUG(("53c700: sync 1.5 async 3\n"));
725 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
Kars de Jong63273132007-06-17 14:47:05 +0200726 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 hostdata->sync_clock = hostdata->clock*2;
728 hostdata->sync_clock /= 3;
729
730 } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
731 /* sync divider 1, async divider 2 */
732 DEBUG(("53c700: sync 1 async 2\n"));
733 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
Kars de Jong63273132007-06-17 14:47:05 +0200734 NCR_700_writeb(ASYNC_DIV_2_0 | hostdata->dcntl_extra, host, DCNTL_REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 hostdata->sync_clock = hostdata->clock;
736 } else if(hostdata->clock > 25 && hostdata->clock <=37) {
737 /* sync divider 1, async divider 1.5 */
738 DEBUG(("53c700: sync 1 async 1.5\n"));
739 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
Kars de Jong63273132007-06-17 14:47:05 +0200740 NCR_700_writeb(ASYNC_DIV_1_5 | hostdata->dcntl_extra, host, DCNTL_REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 hostdata->sync_clock = hostdata->clock;
742 } else {
743 DEBUG(("53c700: sync 1 async 1\n"));
744 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
Kars de Jong63273132007-06-17 14:47:05 +0200745 NCR_700_writeb(ASYNC_DIV_1_0 | hostdata->dcntl_extra, host, DCNTL_REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 /* sync divider 1, async divider 1 */
747 hostdata->sync_clock = hostdata->clock;
748 }
749 /* Calculate the actual minimum period that can be supported
750 * by our synchronous clock speed. See the 710 manual for
751 * exact details of this calculation which is based on a
752 * setting of the SXFER register */
753 min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
754 hostdata->min_period = NCR_700_MIN_PERIOD;
755 if(min_period > NCR_700_MIN_PERIOD)
756 hostdata->min_period = min_period;
757}
758
759STATIC void
760NCR_700_chip_reset(struct Scsi_Host *host)
761{
762 struct NCR_700_Host_Parameters *hostdata =
763 (struct NCR_700_Host_Parameters *)host->hostdata[0];
764 if(hostdata->chip710) {
765 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
766 udelay(100);
767
768 NCR_700_writeb(0, host, ISTAT_REG);
769 } else {
770 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
771 udelay(100);
772
773 NCR_700_writeb(0, host, DCNTL_REG);
774 }
775
776 mdelay(1000);
777
778 NCR_700_chip_setup(host);
779}
780
781/* The heart of the message processing engine is that the instruction
782 * immediately after the INT is the normal case (and so must be CLEAR
783 * ACK). If we want to do something else, we call that routine in
784 * scripts and set temp to be the normal case + 8 (skipping the CLEAR
785 * ACK) so that the routine returns correctly to resume its activity
786 * */
787STATIC __u32
788process_extended_message(struct Scsi_Host *host,
789 struct NCR_700_Host_Parameters *hostdata,
790 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
791{
792 __u32 resume_offset = dsp, temp = dsp + 8;
793 __u8 pun = 0xff, lun = 0xff;
794
795 if(SCp != NULL) {
796 pun = SCp->device->id;
797 lun = SCp->device->lun;
798 }
799
800 switch(hostdata->msgin[2]) {
801 case A_SDTR_MSG:
802 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
803 struct scsi_target *starget = SCp->device->sdev_target;
804 __u8 period = hostdata->msgin[3];
805 __u8 offset = hostdata->msgin[4];
806
807 if(offset == 0 || period == 0) {
808 offset = 0;
809 period = 0;
810 }
811
812 spi_offset(starget) = offset;
813 spi_period(starget) = period;
814
815 if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
816 spi_display_xfer_agreement(starget);
817 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
818 }
819
820 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
821 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
822
823 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
824 host, SXFER_REG);
825
826 } else {
827 /* SDTR message out of the blue, reject it */
Jeff Garzik017560f2005-10-24 18:04:36 -0400828 shost_printk(KERN_WARNING, host,
829 "Unexpected SDTR msg\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830 hostdata->msgout[0] = A_REJECT_MSG;
Ralf Baechled3fa72e2006-12-06 20:38:56 -0800831 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
832 script_patch_16(hostdata->dev, hostdata->script,
833 MessageCount, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 /* SendMsgOut returns, so set up the return
835 * address */
836 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
837 }
838 break;
839
840 case A_WDTR_MSG:
841 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
842 host->host_no, pun, lun);
843 hostdata->msgout[0] = A_REJECT_MSG;
Ralf Baechled3fa72e2006-12-06 20:38:56 -0800844 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
845 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
846 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
848
849 break;
850
851 default:
852 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
853 host->host_no, pun, lun,
854 NCR_700_phase[(dsps & 0xf00) >> 8]);
Matthew Wilcox1abfd372005-12-15 16:22:01 -0500855 spi_print_msg(hostdata->msgin);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 printk("\n");
857 /* just reject it */
858 hostdata->msgout[0] = A_REJECT_MSG;
Ralf Baechled3fa72e2006-12-06 20:38:56 -0800859 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
860 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
861 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862 /* SendMsgOut returns, so set up the return
863 * address */
864 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
865 }
866 NCR_700_writel(temp, host, TEMP_REG);
867 return resume_offset;
868}
869
870STATIC __u32
871process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
872 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
873{
874 /* work out where to return to */
875 __u32 temp = dsp + 8, resume_offset = dsp;
876 __u8 pun = 0xff, lun = 0xff;
877
878 if(SCp != NULL) {
879 pun = SCp->device->id;
880 lun = SCp->device->lun;
881 }
882
883#ifdef NCR_700_DEBUG
884 printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
885 NCR_700_phase[(dsps & 0xf00) >> 8]);
Matthew Wilcox1abfd372005-12-15 16:22:01 -0500886 spi_print_msg(hostdata->msgin);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 printk("\n");
888#endif
889
890 switch(hostdata->msgin[0]) {
891
892 case A_EXTENDED_MSG:
893 resume_offset = process_extended_message(host, hostdata, SCp,
894 dsp, dsps);
895 break;
896
897 case A_REJECT_MSG:
898 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
899 /* Rejected our sync negotiation attempt */
900 spi_period(SCp->device->sdev_target) =
901 spi_offset(SCp->device->sdev_target) = 0;
902 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
903 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
904 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
905 /* rejected our first simple tag message */
Jeff Garzik017560f2005-10-24 18:04:36 -0400906 scmd_printk(KERN_WARNING, SCp,
907 "Rejected first tag queue attempt, turning off tag queueing\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 /* we're done negotiating */
909 NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
Jeff Garzik017560f2005-10-24 18:04:36 -0400910 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911 SCp->device->tagged_supported = 0;
912 scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
913 } else {
Jeff Garzik017560f2005-10-24 18:04:36 -0400914 shost_printk(KERN_WARNING, host,
915 "(%d:%d) Unexpected REJECT Message %s\n",
916 pun, lun,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917 NCR_700_phase[(dsps & 0xf00) >> 8]);
918 /* however, just ignore it */
919 }
920 break;
921
922 case A_PARITY_ERROR_MSG:
923 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
924 pun, lun);
925 NCR_700_internal_bus_reset(host);
926 break;
927 case A_SIMPLE_TAG_MSG:
928 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
929 pun, lun, hostdata->msgin[1],
930 NCR_700_phase[(dsps & 0xf00) >> 8]);
931 /* just ignore it */
932 break;
933 default:
934 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
935 host->host_no, pun, lun,
936 NCR_700_phase[(dsps & 0xf00) >> 8]);
937
Matthew Wilcox1abfd372005-12-15 16:22:01 -0500938 spi_print_msg(hostdata->msgin);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939 printk("\n");
940 /* just reject it */
941 hostdata->msgout[0] = A_REJECT_MSG;
Ralf Baechled3fa72e2006-12-06 20:38:56 -0800942 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
943 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
944 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 /* SendMsgOut returns, so set up the return
946 * address */
947 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
948
949 break;
950 }
951 NCR_700_writel(temp, host, TEMP_REG);
952 /* set us up to receive another message */
Ralf Baechled3fa72e2006-12-06 20:38:56 -0800953 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954 return resume_offset;
955}
956
957STATIC __u32
958process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
959 struct Scsi_Host *host,
960 struct NCR_700_Host_Parameters *hostdata)
961{
962 __u32 resume_offset = 0;
963 __u8 pun = 0xff, lun=0xff;
964
965 if(SCp != NULL) {
966 pun = SCp->device->id;
967 lun = SCp->device->lun;
968 }
969
970 if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
971 DEBUG((" COMMAND COMPLETE, status=%02x\n",
972 hostdata->status[0]));
973 /* OK, if TCQ still under negotiation, we now know it works */
974 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
975 NCR_700_set_tag_neg_state(SCp->device,
976 NCR_700_FINISHED_TAG_NEGOTIATION);
977
978 /* check for contingent allegiance contitions */
979 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
980 status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
981 struct NCR_700_command_slot *slot =
982 (struct NCR_700_command_slot *)SCp->host_scribble;
James Bottomley0f13fc02006-06-29 13:02:11 -0400983 if(slot->flags == NCR_700_FLAG_AUTOSENSE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 /* OOPS: bad device, returning another
985 * contingent allegiance condition */
Jeff Garzik017560f2005-10-24 18:04:36 -0400986 scmd_printk(KERN_ERR, SCp,
987 "broken device is looping in contingent allegiance: ignoring\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
989 } else {
James Bottomley0f13fc02006-06-29 13:02:11 -0400990 char *cmnd =
991 NCR_700_get_sense_cmnd(SCp->device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992#ifdef NCR_DEBUG
993 scsi_print_command(SCp);
994 printk(" cmd %p has status %d, requesting sense\n",
995 SCp, hostdata->status[0]);
996#endif
997 /* we can destroy the command here
998 * because the contingent allegiance
999 * condition will cause a retry which
1000 * will re-copy the command from the
1001 * saved data_cmnd. We also unmap any
1002 * data associated with the command
1003 * here */
1004 NCR_700_unmap(hostdata, SCp, slot);
James Bottomley67d59df2006-06-13 21:31:19 -05001005 dma_unmap_single(hostdata->dev, slot->pCmd,
1006 sizeof(SCp->cmnd),
1007 DMA_TO_DEVICE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008
James Bottomley0f13fc02006-06-29 13:02:11 -04001009 cmnd[0] = REQUEST_SENSE;
1010 cmnd[1] = (SCp->device->lun & 0x7) << 5;
1011 cmnd[2] = 0;
1012 cmnd[3] = 0;
1013 cmnd[4] = sizeof(SCp->sense_buffer);
1014 cmnd[5] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 /* Here's a quiet hack: the
1016 * REQUEST_SENSE command is six bytes,
1017 * so store a flag indicating that
1018 * this was an internal sense request
1019 * and the original status at the end
1020 * of the command */
James Bottomley0f13fc02006-06-29 13:02:11 -04001021 cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1022 cmnd[7] = hostdata->status[0];
James Bottomleyc603d042006-12-01 11:25:12 -06001023 cmnd[8] = SCp->cmd_len;
1024 SCp->cmd_len = 6; /* command length for
1025 * REQUEST_SENSE */
James Bottomley0f13fc02006-06-29 13:02:11 -04001026 slot->pCmd = dma_map_single(hostdata->dev, cmnd, MAX_COMMAND_SIZE, DMA_TO_DEVICE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1028 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | sizeof(SCp->sense_buffer));
1029 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1030 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1031 slot->SG[1].pAddr = 0;
1032 slot->resume_offset = hostdata->pScript;
Ralf Baechled3fa72e2006-12-06 20:38:56 -08001033 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1034 dma_cache_sync(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1035
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036 /* queue the command for reissue */
1037 slot->state = NCR_700_SLOT_QUEUED;
James Bottomley67d59df2006-06-13 21:31:19 -05001038 slot->flags = NCR_700_FLAG_AUTOSENSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039 hostdata->state = NCR_700_HOST_FREE;
1040 hostdata->cmd = NULL;
1041 }
1042 } else {
1043 // Currently rely on the mid layer evaluation
1044 // of the tag queuing capability
1045 //
1046 //if(status_byte(hostdata->status[0]) == GOOD &&
1047 // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1048 // /* Piggy back the tag queueing support
1049 // * on this command */
1050 // dma_sync_single_for_cpu(hostdata->dev,
1051 // slot->dma_handle,
1052 // SCp->request_bufflen,
1053 // DMA_FROM_DEVICE);
1054 // if(((char *)SCp->request_buffer)[7] & 0x02) {
Jeff Garzik017560f2005-10-24 18:04:36 -04001055 // scmd_printk(KERN_INFO, SCp,
1056 // "Enabling Tag Command Queuing\n");
1057 // hostdata->tag_negotiated |= (1<<scmd_id(SCp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058 // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1059 // } else {
1060 // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
Jeff Garzik017560f2005-10-24 18:04:36 -04001061 // hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062 // }
1063 //}
1064 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1065 }
1066 } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1067 __u8 i = (dsps & 0xf00) >> 8;
1068
Jeff Garzik017560f2005-10-24 18:04:36 -04001069 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 NCR_700_phase[i],
1071 sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
Jeff Garzik017560f2005-10-24 18:04:36 -04001072 scmd_printk(KERN_ERR, SCp, " len = %d, cmd =",
1073 SCp->cmd_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 scsi_print_command(SCp);
1075
1076 NCR_700_internal_bus_reset(host);
1077 } else if((dsps & 0xfffff000) == A_FATAL) {
1078 int i = (dsps & 0xfff);
1079
1080 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1081 host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1082 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1083 printk(KERN_ERR " msg begins %02x %02x\n",
1084 hostdata->msgin[0], hostdata->msgin[1]);
1085 }
1086 NCR_700_internal_bus_reset(host);
1087 } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1088#ifdef NCR_700_DEBUG
1089 __u8 i = (dsps & 0xf00) >> 8;
1090
1091 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1092 host->host_no, pun, lun,
1093 i, NCR_700_phase[i]);
1094#endif
1095 save_for_reselection(hostdata, SCp, dsp);
1096
1097 } else if(dsps == A_RESELECTION_IDENTIFIED) {
1098 __u8 lun;
1099 struct NCR_700_command_slot *slot;
1100 __u8 reselection_id = hostdata->reselection_id;
1101 struct scsi_device *SDp;
1102
1103 lun = hostdata->msgin[0] & 0x1f;
1104
1105 hostdata->reselection_id = 0xff;
1106 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1107 host->host_no, reselection_id, lun));
1108 /* clear the reselection indicator */
1109 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1110 if(unlikely(SDp == NULL)) {
1111 printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1112 host->host_no, reselection_id, lun);
1113 BUG();
1114 }
1115 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1116 struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1117 if(unlikely(SCp == NULL)) {
1118 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1119 host->host_no, reselection_id, lun, hostdata->msgin[2]);
1120 BUG();
1121 }
1122
1123 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
Jeff Garzik017560f2005-10-24 18:04:36 -04001124 DDEBUG(KERN_DEBUG, SDp,
1125 "reselection is tag %d, slot %p(%d)\n",
1126 hostdata->msgin[2], slot, slot->tag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127 } else {
1128 struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1129 if(unlikely(SCp == NULL)) {
Jeff Garzik017560f2005-10-24 18:04:36 -04001130 sdev_printk(KERN_ERR, SDp,
1131 "no saved request for untagged cmd\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132 BUG();
1133 }
1134 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1135 }
1136
1137 if(slot == NULL) {
1138 printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1139 host->host_no, reselection_id, lun,
1140 hostdata->msgin[0], hostdata->msgin[1],
1141 hostdata->msgin[2]);
1142 } else {
1143 if(hostdata->state != NCR_700_HOST_BUSY)
1144 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1145 host->host_no);
1146 resume_offset = slot->resume_offset;
1147 hostdata->cmd = slot->cmnd;
1148
1149 /* re-patch for this command */
Ralf Baechled3fa72e2006-12-06 20:38:56 -08001150 script_patch_32_abs(hostdata->dev, hostdata->script,
1151 CommandAddress, slot->pCmd);
1152 script_patch_16(hostdata->dev, hostdata->script,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153 CommandCount, slot->cmnd->cmd_len);
Ralf Baechled3fa72e2006-12-06 20:38:56 -08001154 script_patch_32_abs(hostdata->dev, hostdata->script,
1155 SGScriptStartAddress,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156 to32bit(&slot->pSG[0].ins));
1157
1158 /* Note: setting SXFER only works if we're
1159 * still in the MESSAGE phase, so it is vital
1160 * that ACK is still asserted when we process
1161 * the reselection message. The resume offset
1162 * should therefore always clear ACK */
1163 NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1164 host, SXFER_REG);
Ralf Baechled3fa72e2006-12-06 20:38:56 -08001165 dma_cache_sync(hostdata->dev, hostdata->msgin,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166 MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
Ralf Baechled3fa72e2006-12-06 20:38:56 -08001167 dma_cache_sync(hostdata->dev, hostdata->msgout,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168 MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1169 /* I'm just being paranoid here, the command should
1170 * already have been flushed from the cache */
Ralf Baechled3fa72e2006-12-06 20:38:56 -08001171 dma_cache_sync(hostdata->dev, slot->cmnd->cmnd,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172 slot->cmnd->cmd_len, DMA_TO_DEVICE);
1173
1174
1175
1176 }
1177 } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1178
1179 /* This section is full of debugging code because I've
1180 * never managed to reach it. I think what happens is
1181 * that, because the 700 runs with selection
1182 * interrupts enabled the whole time that we take a
1183 * selection interrupt before we manage to get to the
1184 * reselected script interrupt */
1185
1186 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1187 struct NCR_700_command_slot *slot;
1188
1189 /* Take out our own ID */
1190 reselection_id &= ~(1<<host->this_id);
1191
1192 /* I've never seen this happen, so keep this as a printk rather
1193 * than a debug */
1194 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1195 host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1196
1197 {
1198 /* FIXME: DEBUGGING CODE */
1199 __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1200 int i;
1201
1202 for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1203 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1204 && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1205 break;
1206 }
1207 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);
1208 SCp = hostdata->slots[i].cmnd;
1209 }
1210
1211 if(SCp != NULL) {
1212 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1213 /* change slot from busy to queued to redo command */
1214 slot->state = NCR_700_SLOT_QUEUED;
1215 }
1216 hostdata->cmd = NULL;
1217
1218 if(reselection_id == 0) {
1219 if(hostdata->reselection_id == 0xff) {
1220 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1221 return 0;
1222 } else {
1223 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1224 host->host_no);
1225 reselection_id = hostdata->reselection_id;
1226 }
1227 } else {
1228
1229 /* convert to real ID */
1230 reselection_id = bitmap_to_number(reselection_id);
1231 }
1232 hostdata->reselection_id = reselection_id;
1233 /* just in case we have a stale simple tag message, clear it */
1234 hostdata->msgin[1] = 0;
Ralf Baechled3fa72e2006-12-06 20:38:56 -08001235 dma_cache_sync(hostdata->dev, hostdata->msgin,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236 MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1237 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1238 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1239 } else {
1240 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1241 }
1242 } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1243 /* we've just disconnected from the bus, do nothing since
1244 * a return here will re-run the queued command slot
1245 * that may have been interrupted by the initial selection */
1246 DEBUG((" SELECTION COMPLETED\n"));
1247 } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1248 resume_offset = process_message(host, hostdata, SCp,
1249 dsp, dsps);
1250 } else if((dsps & 0xfffff000) == 0) {
1251 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1252 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1253 host->host_no, pun, lun, NCR_700_condition[i],
1254 NCR_700_phase[j], dsp - hostdata->pScript);
1255 if(SCp != NULL) {
FUJITA Tomonori3258a4d2007-05-14 19:12:55 +09001256 struct scatterlist *sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257
FUJITA Tomonori3258a4d2007-05-14 19:12:55 +09001258 scsi_print_command(SCp);
1259 scsi_for_each_sg(SCp, sg, scsi_sg_count(SCp) + 1, i) {
1260 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261 }
FUJITA Tomonori3258a4d2007-05-14 19:12:55 +09001262 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263 NCR_700_internal_bus_reset(host);
1264 } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1265 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1266 host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1267 resume_offset = dsp;
1268 } else {
1269 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1270 host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1271 NCR_700_internal_bus_reset(host);
1272 }
1273 return resume_offset;
1274}
1275
1276/* We run the 53c700 with selection interrupts always enabled. This
1277 * means that the chip may be selected as soon as the bus frees. On a
1278 * busy bus, this can be before the scripts engine finishes its
1279 * processing. Therefore, part of the selection processing has to be
1280 * to find out what the scripts engine is doing and complete the
1281 * function if necessary (i.e. process the pending disconnect or save
1282 * the interrupted initial selection */
1283STATIC inline __u32
1284process_selection(struct Scsi_Host *host, __u32 dsp)
1285{
1286 __u8 id = 0; /* Squash compiler warning */
1287 int count = 0;
1288 __u32 resume_offset = 0;
1289 struct NCR_700_Host_Parameters *hostdata =
1290 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1291 struct scsi_cmnd *SCp = hostdata->cmd;
1292 __u8 sbcl;
1293
1294 for(count = 0; count < 5; count++) {
1295 id = NCR_700_readb(host, hostdata->chip710 ?
1296 CTEST9_REG : SFBR_REG);
1297
1298 /* Take out our own ID */
1299 id &= ~(1<<host->this_id);
1300 if(id != 0)
1301 break;
1302 udelay(5);
1303 }
1304 sbcl = NCR_700_readb(host, SBCL_REG);
1305 if((sbcl & SBCL_IO) == 0) {
1306 /* mark as having been selected rather than reselected */
1307 id = 0xff;
1308 } else {
1309 /* convert to real ID */
1310 hostdata->reselection_id = id = bitmap_to_number(id);
1311 DEBUG(("scsi%d: Reselected by %d\n",
1312 host->host_no, id));
1313 }
1314 if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1315 struct NCR_700_command_slot *slot =
1316 (struct NCR_700_command_slot *)SCp->host_scribble;
1317 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));
1318
1319 switch(dsp - hostdata->pScript) {
1320 case Ent_Disconnect1:
1321 case Ent_Disconnect2:
1322 save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1323 break;
1324 case Ent_Disconnect3:
1325 case Ent_Disconnect4:
1326 save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1327 break;
1328 case Ent_Disconnect5:
1329 case Ent_Disconnect6:
1330 save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1331 break;
1332 case Ent_Disconnect7:
1333 case Ent_Disconnect8:
1334 save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1335 break;
1336 case Ent_Finish1:
1337 case Ent_Finish2:
1338 process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1339 break;
1340
1341 default:
1342 slot->state = NCR_700_SLOT_QUEUED;
1343 break;
1344 }
1345 }
1346 hostdata->state = NCR_700_HOST_BUSY;
1347 hostdata->cmd = NULL;
1348 /* clear any stale simple tag message */
1349 hostdata->msgin[1] = 0;
Ralf Baechled3fa72e2006-12-06 20:38:56 -08001350 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351 DMA_BIDIRECTIONAL);
1352
1353 if(id == 0xff) {
1354 /* Selected as target, Ignore */
1355 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1356 } else if(hostdata->tag_negotiated & (1<<id)) {
1357 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1358 } else {
1359 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1360 }
1361 return resume_offset;
1362}
1363
1364static inline void
1365NCR_700_clear_fifo(struct Scsi_Host *host) {
1366 const struct NCR_700_Host_Parameters *hostdata
1367 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1368 if(hostdata->chip710) {
1369 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1370 } else {
1371 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1372 }
1373}
1374
1375static inline void
1376NCR_700_flush_fifo(struct Scsi_Host *host) {
1377 const struct NCR_700_Host_Parameters *hostdata
1378 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1379 if(hostdata->chip710) {
1380 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1381 udelay(10);
1382 NCR_700_writeb(0, host, CTEST8_REG);
1383 } else {
1384 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1385 udelay(10);
1386 NCR_700_writeb(0, host, DFIFO_REG);
1387 }
1388}
1389
1390
1391/* The queue lock with interrupts disabled must be held on entry to
1392 * this function */
1393STATIC int
1394NCR_700_start_command(struct scsi_cmnd *SCp)
1395{
1396 struct NCR_700_command_slot *slot =
1397 (struct NCR_700_command_slot *)SCp->host_scribble;
1398 struct NCR_700_Host_Parameters *hostdata =
1399 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1400 __u16 count = 1; /* for IDENTIFY message */
1401
1402 if(hostdata->state != NCR_700_HOST_FREE) {
1403 /* keep this inside the lock to close the race window where
1404 * the running command finishes on another CPU while we don't
1405 * change the state to queued on this one */
1406 slot->state = NCR_700_SLOT_QUEUED;
1407
1408 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1409 SCp->device->host->host_no, slot->cmnd, slot));
1410 return 0;
1411 }
1412 hostdata->state = NCR_700_HOST_BUSY;
1413 hostdata->cmd = SCp;
1414 slot->state = NCR_700_SLOT_BUSY;
1415 /* keep interrupts disabled until we have the command correctly
1416 * set up so we cannot take a selection interrupt */
1417
James Bottomley67d59df2006-06-13 21:31:19 -05001418 hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&
1419 slot->flags != NCR_700_FLAG_AUTOSENSE),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420 SCp->device->lun);
1421 /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1422 * if the negotiated transfer parameters still hold, so
1423 * always renegotiate them */
James Bottomley67d59df2006-06-13 21:31:19 -05001424 if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||
1425 slot->flags == NCR_700_FLAG_AUTOSENSE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1427 }
1428
1429 /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1430 * If a contingent allegiance condition exists, the device
1431 * will refuse all tags, so send the request sense as untagged
1432 * */
Jeff Garzik422c0d62005-10-24 18:05:09 -04001433 if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
James Bottomley67d59df2006-06-13 21:31:19 -05001434 && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&
1435 slot->flags != NCR_700_FLAG_AUTOSENSE)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
1437 }
1438
1439 if(hostdata->fast &&
1440 NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
Matthew Wilcox6ea3c0b2006-02-07 07:54:46 -07001441 count += spi_populate_sync_msg(&hostdata->msgout[count],
1442 spi_period(SCp->device->sdev_target),
1443 spi_offset(SCp->device->sdev_target));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1445 }
1446
Ralf Baechled3fa72e2006-12-06 20:38:56 -08001447 script_patch_16(hostdata->dev, hostdata->script, MessageCount, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448
1449
Ralf Baechled3fa72e2006-12-06 20:38:56 -08001450 script_patch_ID(hostdata->dev, hostdata->script,
Jeff Garzik422c0d62005-10-24 18:05:09 -04001451 Device_ID, 1<<scmd_id(SCp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452
Ralf Baechled3fa72e2006-12-06 20:38:56 -08001453 script_patch_32_abs(hostdata->dev, hostdata->script, CommandAddress,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001454 slot->pCmd);
Ralf Baechled3fa72e2006-12-06 20:38:56 -08001455 script_patch_16(hostdata->dev, hostdata->script, CommandCount,
1456 SCp->cmd_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 /* finally plumb the beginning of the SG list into the script
1458 * */
Ralf Baechled3fa72e2006-12-06 20:38:56 -08001459 script_patch_32_abs(hostdata->dev, hostdata->script,
1460 SGScriptStartAddress, to32bit(&slot->pSG[0].ins));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461 NCR_700_clear_fifo(SCp->device->host);
1462
1463 if(slot->resume_offset == 0)
1464 slot->resume_offset = hostdata->pScript;
1465 /* now perform all the writebacks and invalidates */
Ralf Baechled3fa72e2006-12-06 20:38:56 -08001466 dma_cache_sync(hostdata->dev, hostdata->msgout, count, DMA_TO_DEVICE);
1467 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468 DMA_FROM_DEVICE);
Ralf Baechled3fa72e2006-12-06 20:38:56 -08001469 dma_cache_sync(hostdata->dev, SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1470 dma_cache_sync(hostdata->dev, hostdata->status, 1, DMA_FROM_DEVICE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471
1472 /* set the synchronous period/offset */
1473 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1474 SCp->device->host, SXFER_REG);
1475 NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1476 NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1477
1478 return 1;
1479}
1480
1481irqreturn_t
David Howells7d12e782006-10-05 14:55:46 +01001482NCR_700_intr(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483{
1484 struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1485 struct NCR_700_Host_Parameters *hostdata =
1486 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1487 __u8 istat;
1488 __u32 resume_offset = 0;
1489 __u8 pun = 0xff, lun = 0xff;
1490 unsigned long flags;
1491 int handled = 0;
1492
1493 /* Use the host lock to serialise acess to the 53c700
1494 * hardware. Note: In future, we may need to take the queue
1495 * lock to enter the done routines. When that happens, we
1496 * need to ensure that for this driver, the host lock and the
1497 * queue lock point to the same thing. */
1498 spin_lock_irqsave(host->host_lock, flags);
1499 if((istat = NCR_700_readb(host, ISTAT_REG))
1500 & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1501 __u32 dsps;
1502 __u8 sstat0 = 0, dstat = 0;
1503 __u32 dsp;
1504 struct scsi_cmnd *SCp = hostdata->cmd;
1505 enum NCR_700_Host_State state;
1506
1507 handled = 1;
1508 state = hostdata->state;
1509 SCp = hostdata->cmd;
1510
1511 if(istat & SCSI_INT_PENDING) {
1512 udelay(10);
1513
1514 sstat0 = NCR_700_readb(host, SSTAT0_REG);
1515 }
1516
1517 if(istat & DMA_INT_PENDING) {
1518 udelay(10);
1519
1520 dstat = NCR_700_readb(host, DSTAT_REG);
1521 }
1522
1523 dsps = NCR_700_readl(host, DSPS_REG);
1524 dsp = NCR_700_readl(host, DSP_REG);
1525
1526 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1527 host->host_no, istat, sstat0, dstat,
1528 (dsp - (__u32)(hostdata->pScript))/4,
1529 dsp, dsps));
1530
1531 if(SCp != NULL) {
1532 pun = SCp->device->id;
1533 lun = SCp->device->lun;
1534 }
1535
1536 if(sstat0 & SCSI_RESET_DETECTED) {
1537 struct scsi_device *SDp;
1538 int i;
1539
1540 hostdata->state = NCR_700_HOST_BUSY;
1541
1542 printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1543 host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1544
1545 scsi_report_bus_reset(host, 0);
1546
1547 /* clear all the negotiated parameters */
1548 __shost_for_each_device(SDp, host)
James Bottomley0f13fc02006-06-29 13:02:11 -04001549 NCR_700_clear_flag(SDp, ~0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550
1551 /* clear all the slots and their pending commands */
1552 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1553 struct scsi_cmnd *SCp;
1554 struct NCR_700_command_slot *slot =
1555 &hostdata->slots[i];
1556
1557 if(slot->state == NCR_700_SLOT_FREE)
1558 continue;
1559
1560 SCp = slot->cmnd;
1561 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1562 slot, SCp);
1563 free_slot(slot, hostdata);
1564 SCp->host_scribble = NULL;
1565 NCR_700_set_depth(SCp->device, 0);
1566 /* NOTE: deadlock potential here: we
1567 * rely on mid-layer guarantees that
1568 * scsi_done won't try to issue the
1569 * command again otherwise we'll
1570 * deadlock on the
1571 * hostdata->state_lock */
1572 SCp->result = DID_RESET << 16;
1573 SCp->scsi_done(SCp);
1574 }
1575 mdelay(25);
1576 NCR_700_chip_setup(host);
1577
1578 hostdata->state = NCR_700_HOST_FREE;
1579 hostdata->cmd = NULL;
1580 /* signal back if this was an eh induced reset */
1581 if(hostdata->eh_complete != NULL)
1582 complete(hostdata->eh_complete);
1583 goto out_unlock;
1584 } else if(sstat0 & SELECTION_TIMEOUT) {
1585 DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1586 host->host_no, pun, lun));
1587 NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1588 } else if(sstat0 & PHASE_MISMATCH) {
1589 struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1590 (struct NCR_700_command_slot *)SCp->host_scribble;
1591
1592 if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1593 /* It wants to reply to some part of
1594 * our message */
1595#ifdef NCR_700_DEBUG
1596 __u32 temp = NCR_700_readl(host, TEMP_REG);
1597 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1598 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)));
1599#endif
1600 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1601 } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1602 dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1603 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1604 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1605 int residual = NCR_700_data_residual(host);
1606 int i;
1607#ifdef NCR_700_DEBUG
1608 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1609
1610 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1611 host->host_no, pun, lun,
1612 SGcount, data_transfer);
1613 scsi_print_command(SCp);
1614 if(residual) {
1615 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1616 host->host_no, pun, lun,
1617 SGcount, data_transfer, residual);
1618 }
1619#endif
1620 data_transfer += residual;
1621
1622 if(data_transfer != 0) {
1623 int count;
1624 __u32 pAddr;
1625
1626 SGcount--;
1627
1628 count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1629 DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1630 slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1631 slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1632 pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1633 pAddr += (count - data_transfer);
1634#ifdef NCR_700_DEBUG
1635 if(pAddr != naddr) {
1636 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);
1637 }
1638#endif
1639 slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1640 }
1641 /* set the executed moves to nops */
1642 for(i=0; i<SGcount; i++) {
1643 slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1644 slot->SG[i].pAddr = 0;
1645 }
Ralf Baechled3fa72e2006-12-06 20:38:56 -08001646 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001647 /* and pretend we disconnected after
1648 * the command phase */
1649 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1650 /* make sure all the data is flushed */
1651 NCR_700_flush_fifo(host);
1652 } else {
1653 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1654 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1655 host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1656 NCR_700_internal_bus_reset(host);
1657 }
1658
1659 } else if(sstat0 & SCSI_GROSS_ERROR) {
1660 printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1661 host->host_no, pun, lun);
1662 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1663 } else if(sstat0 & PARITY_ERROR) {
1664 printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1665 host->host_no, pun, lun);
1666 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1667 } else if(dstat & SCRIPT_INT_RECEIVED) {
1668 DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1669 host->host_no, pun, lun));
1670 resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1671 } else if(dstat & (ILGL_INST_DETECTED)) {
1672 printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1673 " Please email James.Bottomley@HansenPartnership.com with the details\n",
1674 host->host_no, pun, lun,
1675 dsp, dsp - hostdata->pScript);
1676 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1677 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1678 printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1679 host->host_no, pun, lun, dstat);
1680 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1681 }
1682
1683
1684 /* NOTE: selection interrupt processing MUST occur
1685 * after script interrupt processing to correctly cope
1686 * with the case where we process a disconnect and
1687 * then get reselected before we process the
1688 * disconnection */
1689 if(sstat0 & SELECTED) {
1690 /* FIXME: It currently takes at least FOUR
1691 * interrupts to complete a command that
1692 * disconnects: one for the disconnect, one
1693 * for the reselection, one to get the
1694 * reselection data and one to complete the
1695 * command. If we guess the reselected
1696 * command here and prepare it, we only need
1697 * to get a reselection data interrupt if we
1698 * guessed wrongly. Since the interrupt
1699 * overhead is much greater than the command
1700 * setup, this would be an efficient
1701 * optimisation particularly as we probably
1702 * only have one outstanding command on a
1703 * target most of the time */
1704
1705 resume_offset = process_selection(host, dsp);
1706
1707 }
1708
1709 }
1710
1711 if(resume_offset) {
1712 if(hostdata->state != NCR_700_HOST_BUSY) {
1713 printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1714 host->host_no, resume_offset, resume_offset - hostdata->pScript);
1715 hostdata->state = NCR_700_HOST_BUSY;
1716 }
1717
1718 DEBUG(("Attempting to resume at %x\n", resume_offset));
1719 NCR_700_clear_fifo(host);
1720 NCR_700_writel(resume_offset, host, DSP_REG);
1721 }
1722 /* There is probably a technical no-no about this: If we're a
1723 * shared interrupt and we got this interrupt because the
1724 * other device needs servicing not us, we're still going to
1725 * check our queued commands here---of course, there shouldn't
1726 * be any outstanding.... */
1727 if(hostdata->state == NCR_700_HOST_FREE) {
1728 int i;
1729
1730 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1731 /* fairness: always run the queue from the last
1732 * position we left off */
1733 int j = (i + hostdata->saved_slot_position)
1734 % NCR_700_COMMAND_SLOTS_PER_HOST;
1735
1736 if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1737 continue;
1738 if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1739 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1740 host->host_no, &hostdata->slots[j],
1741 hostdata->slots[j].cmnd));
1742 hostdata->saved_slot_position = j + 1;
1743 }
1744
1745 break;
1746 }
1747 }
1748 out_unlock:
1749 spin_unlock_irqrestore(host->host_lock, flags);
1750 return IRQ_RETVAL(handled);
1751}
1752
1753STATIC int
1754NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1755{
1756 struct NCR_700_Host_Parameters *hostdata =
1757 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1758 __u32 move_ins;
1759 enum dma_data_direction direction;
1760 struct NCR_700_command_slot *slot;
1761
1762 if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1763 /* We're over our allocation, this should never happen
1764 * since we report the max allocation to the mid layer */
1765 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1766 return 1;
1767 }
1768 /* check for untagged commands. We cannot have any outstanding
1769 * commands if we accept them. Commands could be untagged because:
1770 *
1771 * - The tag negotiated bitmap is clear
1772 * - The blk layer sent and untagged command
1773 */
1774 if(NCR_700_get_depth(SCp->device) != 0
Jeff Garzik017560f2005-10-24 18:04:36 -04001775 && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001776 || !blk_rq_tagged(SCp->request))) {
Jeff Garzik017560f2005-10-24 18:04:36 -04001777 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1778 NCR_700_get_depth(SCp->device));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001779 return SCSI_MLQUEUE_DEVICE_BUSY;
1780 }
1781 if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
Jeff Garzik017560f2005-10-24 18:04:36 -04001782 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1783 NCR_700_get_depth(SCp->device));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001784 return SCSI_MLQUEUE_DEVICE_BUSY;
1785 }
1786 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1787
1788 /* begin the command here */
1789 /* no need to check for NULL, test for command_slot_count above
1790 * ensures a slot is free */
1791 slot = find_empty_slot(hostdata);
1792
1793 slot->cmnd = SCp;
1794
1795 SCp->scsi_done = done;
1796 SCp->host_scribble = (unsigned char *)slot;
1797 SCp->SCp.ptr = NULL;
1798 SCp->SCp.buffer = NULL;
1799
1800#ifdef NCR_700_DEBUG
1801 printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1802 scsi_print_command(SCp);
1803#endif
1804 if(blk_rq_tagged(SCp->request)
Jeff Garzik017560f2005-10-24 18:04:36 -04001805 && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
Linus Torvalds1da177e2005-04-16 15:20:36 -07001806 && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
Jeff Garzik017560f2005-10-24 18:04:36 -04001807 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1808 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001809 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1810 }
1811
1812 /* here we may have to process an untagged command. The gate
1813 * above ensures that this will be the only one outstanding,
1814 * so clear the tag negotiated bit.
1815 *
1816 * FIXME: This will royally screw up on multiple LUN devices
1817 * */
1818 if(!blk_rq_tagged(SCp->request)
Jeff Garzik017560f2005-10-24 18:04:36 -04001819 && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1820 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1821 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001822 }
1823
Jeff Garzik017560f2005-10-24 18:04:36 -04001824 if((hostdata->tag_negotiated &(1<<scmd_id(SCp)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001825 && scsi_get_tag_type(SCp->device)) {
1826 slot->tag = SCp->request->tag;
Jeff Garzik017560f2005-10-24 18:04:36 -04001827 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1828 slot->tag, slot);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001829 } else {
1830 slot->tag = SCSI_NO_TAG;
1831 /* must populate current_cmnd for scsi_find_tag to work */
1832 SCp->device->current_cmnd = SCp;
1833 }
1834 /* sanity check: some of the commands generated by the mid-layer
1835 * have an eccentric idea of their sc_data_direction */
FUJITA Tomonori3258a4d2007-05-14 19:12:55 +09001836 if(!scsi_sg_count(SCp) && !scsi_bufflen(SCp) &&
1837 SCp->sc_data_direction != DMA_NONE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001838#ifdef NCR_700_DEBUG
1839 printk("53c700: Command");
1840 scsi_print_command(SCp);
1841 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1842#endif
1843 SCp->sc_data_direction = DMA_NONE;
1844 }
1845
1846 switch (SCp->cmnd[0]) {
1847 case REQUEST_SENSE:
1848 /* clear the internal sense magic */
1849 SCp->cmnd[6] = 0;
1850 /* fall through */
1851 default:
1852 /* OK, get it from the command */
1853 switch(SCp->sc_data_direction) {
1854 case DMA_BIDIRECTIONAL:
1855 default:
1856 printk(KERN_ERR "53c700: Unknown command for data direction ");
1857 scsi_print_command(SCp);
1858
1859 move_ins = 0;
1860 break;
1861 case DMA_NONE:
1862 move_ins = 0;
1863 break;
1864 case DMA_FROM_DEVICE:
1865 move_ins = SCRIPT_MOVE_DATA_IN;
1866 break;
1867 case DMA_TO_DEVICE:
1868 move_ins = SCRIPT_MOVE_DATA_OUT;
1869 break;
1870 }
1871 }
1872
1873 /* now build the scatter gather list */
1874 direction = SCp->sc_data_direction;
1875 if(move_ins != 0) {
1876 int i;
1877 int sg_count;
1878 dma_addr_t vPtr = 0;
FUJITA Tomonori3258a4d2007-05-14 19:12:55 +09001879 struct scatterlist *sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001880 __u32 count = 0;
1881
FUJITA Tomonori3258a4d2007-05-14 19:12:55 +09001882 sg_count = scsi_dma_map(SCp);
1883 BUG_ON(sg_count < 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001884
FUJITA Tomonori3258a4d2007-05-14 19:12:55 +09001885 scsi_for_each_sg(SCp, sg, sg_count, i) {
1886 vPtr = sg_dma_address(sg);
1887 count = sg_dma_len(sg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001888
1889 slot->SG[i].ins = bS_to_host(move_ins | count);
1890 DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1891 i, count, slot->SG[i].ins, (unsigned long)vPtr));
1892 slot->SG[i].pAddr = bS_to_host(vPtr);
1893 }
1894 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1895 slot->SG[i].pAddr = 0;
Ralf Baechled3fa72e2006-12-06 20:38:56 -08001896 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001897 DEBUG((" SETTING %08lx to %x\n",
Ralf Baechled3fa72e2006-12-06 20:38:56 -08001898 (&slot->pSG[i].ins),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001899 slot->SG[i].ins));
1900 }
1901 slot->resume_offset = 0;
1902 slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1903 sizeof(SCp->cmnd), DMA_TO_DEVICE);
1904 NCR_700_start_command(SCp);
1905 return 0;
1906}
1907
1908STATIC int
1909NCR_700_abort(struct scsi_cmnd * SCp)
1910{
1911 struct NCR_700_command_slot *slot;
1912
Jeff Garzik017560f2005-10-24 18:04:36 -04001913 scmd_printk(KERN_INFO, SCp,
1914 "New error handler wants to abort command\n\t");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001915 scsi_print_command(SCp);
1916
1917 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1918
1919 if(slot == NULL)
1920 /* no outstanding command to abort */
1921 return SUCCESS;
1922 if(SCp->cmnd[0] == TEST_UNIT_READY) {
1923 /* FIXME: This is because of a problem in the new
1924 * error handler. When it is in error recovery, it
1925 * will send a TUR to a device it thinks may still be
1926 * showing a problem. If the TUR isn't responded to,
1927 * it will abort it and mark the device off line.
1928 * Unfortunately, it does no other error recovery, so
1929 * this would leave us with an outstanding command
1930 * occupying a slot. Rather than allow this to
1931 * happen, we issue a bus reset to force all
1932 * outstanding commands to terminate here. */
1933 NCR_700_internal_bus_reset(SCp->device->host);
1934 /* still drop through and return failed */
1935 }
1936 return FAILED;
1937
1938}
1939
1940STATIC int
1941NCR_700_bus_reset(struct scsi_cmnd * SCp)
1942{
Peter Zijlstra6e9a4732006-09-30 23:28:10 -07001943 DECLARE_COMPLETION_ONSTACK(complete);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001944 struct NCR_700_Host_Parameters *hostdata =
1945 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1946
Jeff Garzik017560f2005-10-24 18:04:36 -04001947 scmd_printk(KERN_INFO, SCp,
1948 "New error handler wants BUS reset, cmd %p\n\t", SCp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001949 scsi_print_command(SCp);
Jeff Garzik 68b3aa72005-05-28 07:56:31 -04001950
Linus Torvalds1da177e2005-04-16 15:20:36 -07001951 /* In theory, eh_complete should always be null because the
1952 * eh is single threaded, but just in case we're handling a
1953 * reset via sg or something */
Jeff Garzik 68b3aa72005-05-28 07:56:31 -04001954 spin_lock_irq(SCp->device->host->host_lock);
1955 while (hostdata->eh_complete != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001956 spin_unlock_irq(SCp->device->host->host_lock);
1957 msleep_interruptible(100);
1958 spin_lock_irq(SCp->device->host->host_lock);
1959 }
Jeff Garzik 68b3aa72005-05-28 07:56:31 -04001960
Linus Torvalds1da177e2005-04-16 15:20:36 -07001961 hostdata->eh_complete = &complete;
1962 NCR_700_internal_bus_reset(SCp->device->host);
Jeff Garzik 68b3aa72005-05-28 07:56:31 -04001963
Linus Torvalds1da177e2005-04-16 15:20:36 -07001964 spin_unlock_irq(SCp->device->host->host_lock);
1965 wait_for_completion(&complete);
1966 spin_lock_irq(SCp->device->host->host_lock);
Jeff Garzik 68b3aa72005-05-28 07:56:31 -04001967
Linus Torvalds1da177e2005-04-16 15:20:36 -07001968 hostdata->eh_complete = NULL;
1969 /* Revalidate the transport parameters of the failing device */
1970 if(hostdata->fast)
1971 spi_schedule_dv_device(SCp->device);
Jeff Garzik 68b3aa72005-05-28 07:56:31 -04001972
1973 spin_unlock_irq(SCp->device->host->host_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001974 return SUCCESS;
1975}
1976
1977STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001978NCR_700_host_reset(struct scsi_cmnd * SCp)
1979{
Jeff Garzik017560f2005-10-24 18:04:36 -04001980 scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset\n\t");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001981 scsi_print_command(SCp);
1982
Jeff Garzik df0ae242005-05-28 07:57:14 -04001983 spin_lock_irq(SCp->device->host->host_lock);
1984
Linus Torvalds1da177e2005-04-16 15:20:36 -07001985 NCR_700_internal_bus_reset(SCp->device->host);
1986 NCR_700_chip_reset(SCp->device->host);
Jeff Garzik df0ae242005-05-28 07:57:14 -04001987
1988 spin_unlock_irq(SCp->device->host->host_lock);
1989
Linus Torvalds1da177e2005-04-16 15:20:36 -07001990 return SUCCESS;
1991}
1992
1993STATIC void
1994NCR_700_set_period(struct scsi_target *STp, int period)
1995{
1996 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
1997 struct NCR_700_Host_Parameters *hostdata =
1998 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
1999
2000 if(!hostdata->fast)
2001 return;
2002
2003 if(period < hostdata->min_period)
2004 period = hostdata->min_period;
2005
2006 spi_period(STp) = period;
2007 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2008 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2009 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2010}
2011
2012STATIC void
2013NCR_700_set_offset(struct scsi_target *STp, int offset)
2014{
2015 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2016 struct NCR_700_Host_Parameters *hostdata =
2017 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2018 int max_offset = hostdata->chip710
2019 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2020
2021 if(!hostdata->fast)
2022 return;
2023
2024 if(offset > max_offset)
2025 offset = max_offset;
2026
2027 /* if we're currently async, make sure the period is reasonable */
2028 if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2029 spi_period(STp) > 0xff))
2030 spi_period(STp) = hostdata->min_period;
2031
2032 spi_offset(STp) = offset;
2033 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2034 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2035 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2036}
2037
James Bottomley0f13fc02006-06-29 13:02:11 -04002038STATIC int
2039NCR_700_slave_alloc(struct scsi_device *SDp)
2040{
2041 SDp->hostdata = kzalloc(sizeof(struct NCR_700_Device_Parameters),
2042 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002043
James Bottomley0f13fc02006-06-29 13:02:11 -04002044 if (!SDp->hostdata)
2045 return -ENOMEM;
2046
2047 return 0;
2048}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002049
2050STATIC int
2051NCR_700_slave_configure(struct scsi_device *SDp)
2052{
2053 struct NCR_700_Host_Parameters *hostdata =
2054 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2055
2056 /* to do here: allocate memory; build a queue_full list */
2057 if(SDp->tagged_supported) {
2058 scsi_set_tag_type(SDp, MSG_ORDERED_TAG);
2059 scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS);
2060 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2061 } else {
2062 /* initialise to default depth */
2063 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
2064 }
2065 if(hostdata->fast) {
2066 /* Find the correct offset and period via domain validation */
2067 if (!spi_initial_dv(SDp->sdev_target))
2068 spi_dv_device(SDp);
2069 } else {
2070 spi_offset(SDp->sdev_target) = 0;
2071 spi_period(SDp->sdev_target) = 0;
2072 }
2073 return 0;
2074}
2075
2076STATIC void
2077NCR_700_slave_destroy(struct scsi_device *SDp)
2078{
James Bottomley67d59df2006-06-13 21:31:19 -05002079 kfree(SDp->hostdata);
2080 SDp->hostdata = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002081}
2082
2083static int
2084NCR_700_change_queue_depth(struct scsi_device *SDp, int depth)
2085{
2086 if (depth > NCR_700_MAX_TAGS)
2087 depth = NCR_700_MAX_TAGS;
2088
2089 scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth);
2090 return depth;
2091}
2092
2093static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
2094{
2095 int change_tag = ((tag_type ==0 && scsi_get_tag_type(SDp) != 0)
2096 || (tag_type != 0 && scsi_get_tag_type(SDp) == 0));
2097 struct NCR_700_Host_Parameters *hostdata =
2098 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2099
2100 scsi_set_tag_type(SDp, tag_type);
2101
2102 /* We have a global (per target) flag to track whether TCQ is
2103 * enabled, so we'll be turning it off for the entire target here.
2104 * our tag algorithm will fail if we mix tagged and untagged commands,
2105 * so quiesce the device before doing this */
2106 if (change_tag)
2107 scsi_target_quiesce(SDp->sdev_target);
2108
2109 if (!tag_type) {
2110 /* shift back to the default unqueued number of commands
2111 * (the user can still raise this) */
2112 scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun);
Jeff Garzik422c0d62005-10-24 18:05:09 -04002113 hostdata->tag_negotiated &= ~(1 << sdev_id(SDp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002114 } else {
2115 /* Here, we cleared the negotiation flag above, so this
2116 * will force the driver to renegotiate */
2117 scsi_activate_tcq(SDp, SDp->queue_depth);
2118 if (change_tag)
2119 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2120 }
2121 if (change_tag)
2122 scsi_target_resume(SDp->sdev_target);
2123
2124 return tag_type;
2125}
2126
2127static ssize_t
Yani Ioannou10523b32005-05-17 06:43:37 -04002128NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002129{
2130 struct scsi_device *SDp = to_scsi_device(dev);
2131
2132 return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2133}
2134
2135static struct device_attribute NCR_700_active_tags_attr = {
2136 .attr = {
2137 .name = "active_tags",
2138 .mode = S_IRUGO,
2139 },
2140 .show = NCR_700_show_active_tags,
2141};
2142
2143STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2144 &NCR_700_active_tags_attr,
2145 NULL,
2146};
2147
2148EXPORT_SYMBOL(NCR_700_detect);
2149EXPORT_SYMBOL(NCR_700_release);
2150EXPORT_SYMBOL(NCR_700_intr);
2151
2152static struct spi_function_template NCR_700_transport_functions = {
2153 .set_period = NCR_700_set_period,
2154 .show_period = 1,
2155 .set_offset = NCR_700_set_offset,
2156 .show_offset = 1,
2157};
2158
2159static int __init NCR_700_init(void)
2160{
2161 NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2162 if(!NCR_700_transport_template)
2163 return -ENODEV;
2164 return 0;
2165}
2166
2167static void __exit NCR_700_exit(void)
2168{
2169 spi_release_transport(NCR_700_transport_template);
2170}
2171
2172module_init(NCR_700_init);
2173module_exit(NCR_700_exit);
2174