53c700.c 67.8 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119
/* -*- mode: c; c-basic-offset: 8 -*- */

/* NCR (or Symbios) 53c700 and 53c700-66 Driver
 *
 * Copyright (C) 2001 by James.Bottomley@HansenPartnership.com
**-----------------------------------------------------------------------------
**  
**  This program is free software; you can redistribute it and/or modify
**  it under the terms of the GNU General Public License as published by
**  the Free Software Foundation; either version 2 of the License, or
**  (at your option) any later version.
**
**  This program is distributed in the hope that it will be useful,
**  but WITHOUT ANY WARRANTY; without even the implied warranty of
**  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
**  GNU General Public License for more details.
**
**  You should have received a copy of the GNU General Public License
**  along with this program; if not, write to the Free Software
**  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**
**-----------------------------------------------------------------------------
 */

/* Notes:
 *
 * This driver is designed exclusively for these chips (virtually the
 * earliest of the scripts engine chips).  They need their own drivers
 * because they are missing so many of the scripts and snazzy register
 * features of their elder brothers (the 710, 720 and 770).
 *
 * The 700 is the lowliest of the line, it can only do async SCSI.
 * The 700-66 can at least do synchronous SCSI up to 10MHz.
 * 
 * The 700 chip has no host bus interface logic of its own.  However,
 * it is usually mapped to a location with well defined register
 * offsets.  Therefore, if you can determine the base address and the
 * irq your board incorporating this chip uses, you can probably use
 * this driver to run it (although you'll probably have to write a
 * minimal wrapper for the purpose---see the NCR_D700 driver for
 * details about how to do this).
 *
 *
 * TODO List:
 *
 * 1. Better statistics in the proc fs
 *
 * 2. Implement message queue (queues SCSI messages like commands) and make
 *    the abort and device reset functions use them.
 * */

/* CHANGELOG
 *
 * Version 2.8
 *
 * Fixed bad bug affecting tag starvation processing (previously the
 * driver would hang the system if too many tags starved.  Also fixed
 * bad bug having to do with 10 byte command processing and REQUEST
 * SENSE (the command would loop forever getting a transfer length
 * mismatch in the CMD phase).
 *
 * Version 2.7
 *
 * Fixed scripts problem which caused certain devices (notably CDRWs)
 * to hang on initial INQUIRY.  Updated NCR_700_readl/writel to use
 * __raw_readl/writel for parisc compatibility (Thomas
 * Bogendoerfer). Added missing SCp->request_bufflen initialisation
 * for sense requests (Ryan Bradetich).
 *
 * Version 2.6
 *
 * Following test of the 64 bit parisc kernel by Richard Hirst,
 * several problems have now been corrected.  Also adds support for
 * consistent memory allocation.
 *
 * Version 2.5
 * 
 * More Compatibility changes for 710 (now actually works).  Enhanced
 * support for odd clock speeds which constrain SDTR negotiations.
 * correct cacheline separation for scsi messages and status for
 * incoherent architectures.  Use of the pci mapping functions on
 * buffers to begin support for 64 bit drivers.
 *
 * Version 2.4
 *
 * Added support for the 53c710 chip (in 53c700 emulation mode only---no 
 * special 53c710 instructions or registers are used).
 *
 * Version 2.3
 *
 * More endianness/cache coherency changes.
 *
 * Better bad device handling (handles devices lying about tag
 * queueing support and devices which fail to provide sense data on
 * contingent allegiance conditions)
 *
 * Many thanks to Richard Hirst <rhirst@linuxcare.com> for patiently
 * debugging this driver on the parisc architecture and suggesting
 * many improvements and bug fixes.
 *
 * Thanks also go to Linuxcare Inc. for providing several PARISC
 * machines for me to debug the driver on.
 *
 * Version 2.2
 *
 * Made the driver mem or io mapped; added endian invariance; added
 * dma cache flushing operations for architectures which need it;
 * added support for more varied clocking speeds.
 *
 * Version 2.1
 *
 * Initial modularisation from the D700.  See NCR_D700.c for the rest of
 * the changelog.
 * */
#define NCR_700_VERSION "2.8"

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/string.h>
120
#include <linux/slab.h>
Linus Torvalds's avatar
Linus Torvalds committed
121 122 123 124 125 126 127 128 129
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/blkdev.h>
#include <linux/module.h>
#include <linux/interrupt.h>
130
#include <linux/device.h>
Linus Torvalds's avatar
Linus Torvalds committed
131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168
#include <asm/dma.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/byteorder.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_spi.h>

#include "53c700.h"

/* NOTE: For 64 bit drivers there are points in the code where we use
 * a non dereferenceable pointer to point to a structure in dma-able
 * memory (which is 32 bits) so that we can use all of the structure
 * operations but take the address at the end.  This macro allows us
 * to truncate the 64 bit pointer down to 32 bits without the compiler
 * complaining */
#define to32bit(x)	((__u32)((unsigned long)(x)))

#ifdef NCR_700_DEBUG
#define STATIC
#else
#define STATIC static
#endif

MODULE_AUTHOR("James Bottomley");
MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");
MODULE_LICENSE("GPL");

/* This is the script */
#include "53c700_d.h"


Jeff Garzik's avatar
Jeff Garzik committed
169
STATIC int NCR_700_queuecommand(struct Scsi_Host *h, struct scsi_cmnd *);
Linus Torvalds's avatar
Linus Torvalds committed
170 171 172 173 174
STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt);
STATIC int NCR_700_bus_reset(struct scsi_cmnd * SCpnt);
STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt);
STATIC void NCR_700_chip_setup(struct Scsi_Host *host);
STATIC void NCR_700_chip_reset(struct Scsi_Host *host);
175
STATIC int NCR_700_slave_alloc(struct scsi_device *SDpnt);
Linus Torvalds's avatar
Linus Torvalds committed
176 177
STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt);
STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt);
178
static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth);
Linus Torvalds's avatar
Linus Torvalds committed
179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258

STATIC struct device_attribute *NCR_700_dev_attrs[];

STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;

static char *NCR_700_phase[] = {
	"",
	"after selection",
	"before command phase",
	"after command phase",
	"after status phase",
	"after data in phase",
	"after data out phase",
	"during data phase",
};

static char *NCR_700_condition[] = {
	"",
	"NOT MSG_OUT",
	"UNEXPECTED PHASE",
	"NOT MSG_IN",
	"UNEXPECTED MSG",
	"MSG_IN",
	"SDTR_MSG RECEIVED",
	"REJECT_MSG RECEIVED",
	"DISCONNECT_MSG RECEIVED",
	"MSG_OUT",
	"DATA_IN",
	
};

static char *NCR_700_fatal_messages[] = {
	"unexpected message after reselection",
	"still MSG_OUT after message injection",
	"not MSG_IN after selection",
	"Illegal message length received",
};

static char *NCR_700_SBCL_bits[] = {
	"IO ",
	"CD ",
	"MSG ",
	"ATN ",
	"SEL ",
	"BSY ",
	"ACK ",
	"REQ ",
};

static char *NCR_700_SBCL_to_phase[] = {
	"DATA_OUT",
	"DATA_IN",
	"CMD_OUT",
	"STATE",
	"ILLEGAL PHASE",
	"ILLEGAL PHASE",
	"MSG OUT",
	"MSG IN",
};

/* This translates the SDTR message offset and period to a value
 * which can be loaded into the SXFER_REG.
 *
 * NOTE: According to SCSI-2, the true transfer period (in ns) is
 *       actually four times this period value */
static inline __u8
NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
			       __u8 offset, __u8 period)
{
	int XFERP;

	__u8 min_xferp = (hostdata->chip710
			  ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
	__u8 max_offset = (hostdata->chip710
			   ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);

	if(offset == 0)
		return 0;

	if(period < hostdata->min_period) {
259
		printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4);
Linus Torvalds's avatar
Linus Torvalds committed
260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301
		period = hostdata->min_period;
	}
	XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
	if(offset > max_offset) {
		printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
		       offset, max_offset);
		offset = max_offset;
	}
	if(XFERP < min_xferp) {
		XFERP =  min_xferp;
	}
	return (offset & 0x0f) | (XFERP & 0x07)<<4;
}

static inline __u8
NCR_700_get_SXFER(struct scsi_device *SDp)
{
	struct NCR_700_Host_Parameters *hostdata = 
		(struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];

	return NCR_700_offset_period_to_sxfer(hostdata,
					      spi_offset(SDp->sdev_target),
					      spi_period(SDp->sdev_target));
}

struct Scsi_Host *
NCR_700_detect(struct scsi_host_template *tpnt,
	       struct NCR_700_Host_Parameters *hostdata, struct device *dev)
{
	dma_addr_t pScript, pSlots;
	__u8 *memory;
	__u32 *script;
	struct Scsi_Host *host;
	static int banner = 0;
	int j;

	if(tpnt->sdev_attrs == NULL)
		tpnt->sdev_attrs = NCR_700_dev_attrs;

	memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
				       &pScript, GFP_KERNEL);
	if(memory == NULL) {
302
		printk(KERN_ERR "53c700: Failed to allocate memory for driver, detaching\n");
Linus Torvalds's avatar
Linus Torvalds committed
303 304 305 306 307 308 309 310 311
		return NULL;
	}

	script = (__u32 *)memory;
	hostdata->msgin = memory + MSGIN_OFFSET;
	hostdata->msgout = memory + MSGOUT_OFFSET;
	hostdata->status = memory + STATUS_OFFSET;
	hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
	hostdata->dev = dev;
312

Linus Torvalds's avatar
Linus Torvalds committed
313 314 315 316 317 318 319 320 321 322 323 324 325
	pSlots = pScript + SLOTS_OFFSET;

	/* Fill in the missing routines from the host template */
	tpnt->queuecommand = NCR_700_queuecommand;
	tpnt->eh_abort_handler = NCR_700_abort;
	tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
	tpnt->eh_host_reset_handler = NCR_700_host_reset;
	tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
	tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
	tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
	tpnt->use_clustering = ENABLE_CLUSTERING;
	tpnt->slave_configure = NCR_700_slave_configure;
	tpnt->slave_destroy = NCR_700_slave_destroy;
326
	tpnt->slave_alloc = NCR_700_slave_alloc;
Linus Torvalds's avatar
Linus Torvalds committed
327
	tpnt->change_queue_depth = NCR_700_change_queue_depth;
328

Linus Torvalds's avatar
Linus Torvalds committed
329 330 331 332 333 334 335 336 337 338
	if(tpnt->name == NULL)
		tpnt->name = "53c700";
	if(tpnt->proc_name == NULL)
		tpnt->proc_name = "53c700";

	host = scsi_host_alloc(tpnt, 4);
	if (!host)
		return NULL;
	memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
	       * NCR_700_COMMAND_SLOTS_PER_HOST);
339
	for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
Linus Torvalds's avatar
Linus Torvalds committed
340 341 342 343 344 345 346 347 348 349
		dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
					  - (unsigned long)&hostdata->slots[0].SG[0]);
		hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
		if(j == 0)
			hostdata->free_list = &hostdata->slots[j];
		else
			hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
		hostdata->slots[j].state = NCR_700_SLOT_FREE;
	}

350
	for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)
Linus Torvalds's avatar
Linus Torvalds committed
351 352 353
		script[j] = bS_to_host(SCRIPT[j]);

	/* adjust all labels to be bus physical */
354
	for (j = 0; j < PATCHES; j++)
Linus Torvalds's avatar
Linus Torvalds committed
355 356
		script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
	/* now patch up fixed addresses. */
357
	script_patch_32(hostdata->dev, script, MessageLocation,
Linus Torvalds's avatar
Linus Torvalds committed
358
			pScript + MSGOUT_OFFSET);
359
	script_patch_32(hostdata->dev, script, StatusAddress,
Linus Torvalds's avatar
Linus Torvalds committed
360
			pScript + STATUS_OFFSET);
361
	script_patch_32(hostdata->dev, script, ReceiveMsgAddress,
Linus Torvalds's avatar
Linus Torvalds committed
362 363 364 365 366 367 368
			pScript + MSGIN_OFFSET);

	hostdata->script = script;
	hostdata->pScript = pScript;
	dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
	hostdata->state = NCR_700_HOST_FREE;
	hostdata->cmd = NULL;
369
	host->max_id = 8;
Linus Torvalds's avatar
Linus Torvalds committed
370 371 372
	host->max_lun = NCR_700_MAX_LUNS;
	BUG_ON(NCR_700_transport_template == NULL);
	host->transportt = NCR_700_transport_template;
373
	host->unique_id = (unsigned long)hostdata->base;
Linus Torvalds's avatar
Linus Torvalds committed
374 375 376 377
	hostdata->eh_complete = NULL;
	host->hostdata[0] = (unsigned long)hostdata;
	/* kick the chip */
	NCR_700_writeb(0xff, host, CTEST9_REG);
378
	if (hostdata->chip710)
Linus Torvalds's avatar
Linus Torvalds committed
379 380 381 382
		hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
	else
		hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
	hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
383
	if (banner == 0) {
Linus Torvalds's avatar
Linus Torvalds committed
384 385 386 387
		printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
		banner = 1;
	}
	printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
388
	       hostdata->chip710 ? "53c710" :
Linus Torvalds's avatar
Linus Torvalds committed
389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532
	       (hostdata->fast ? "53c700-66" : "53c700"),
	       hostdata->rev, hostdata->differential ?
	       "(Differential)" : "");
	/* reset the chip */
	NCR_700_chip_reset(host);

	if (scsi_add_host(host, dev)) {
		dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
		scsi_host_put(host);
		return NULL;
	}

	spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
		SPI_SIGNAL_SE;

	return host;
}

int
NCR_700_release(struct Scsi_Host *host)
{
	struct NCR_700_Host_Parameters *hostdata = 
		(struct NCR_700_Host_Parameters *)host->hostdata[0];

	dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
			       hostdata->script, hostdata->pScript);
	return 1;
}

static inline __u8
NCR_700_identify(int can_disconnect, __u8 lun)
{
	return IDENTIFY_BASE |
		((can_disconnect) ? 0x40 : 0) |
		(lun & NCR_700_LUN_MASK);
}

/*
 * Function : static int data_residual (Scsi_Host *host)
 *
 * Purpose : return residual data count of what's in the chip.  If you
 * really want to know what this function is doing, it's almost a
 * direct transcription of the algorithm described in the 53c710
 * guide, except that the DBC and DFIFO registers are only 6 bits
 * wide on a 53c700.
 *
 * Inputs : host - SCSI host */
static inline int
NCR_700_data_residual (struct Scsi_Host *host) {
	struct NCR_700_Host_Parameters *hostdata = 
		(struct NCR_700_Host_Parameters *)host->hostdata[0];
	int count, synchronous = 0;
	unsigned int ddir;

	if(hostdata->chip710) {
		count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
			 (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
	} else {
		count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
			 (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
	}
	
	if(hostdata->fast)
		synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
	
	/* get the data direction */
	ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;

	if (ddir) {
		/* Receive */
		if (synchronous) 
			count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
		else
			if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
				++count;
	} else {
		/* Send */
		__u8 sstat = NCR_700_readb(host, SSTAT1_REG);
		if (sstat & SODL_REG_FULL)
			++count;
		if (synchronous && (sstat & SODR_REG_FULL))
			++count;
	}
#ifdef NCR_700_DEBUG
	if(count)
		printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
#endif
	return count;
}

/* print out the SCSI wires and corresponding phase from the SBCL register
 * in the chip */
static inline char *
sbcl_to_string(__u8 sbcl)
{
	int i;
	static char ret[256];

	ret[0]='\0';
	for(i=0; i<8; i++) {
		if((1<<i) & sbcl) 
			strcat(ret, NCR_700_SBCL_bits[i]);
	}
	strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
	return ret;
}

static inline __u8
bitmap_to_number(__u8 bitmap)
{
	__u8 i;

	for(i=0; i<8 && !(bitmap &(1<<i)); i++)
		;
	return i;
}

/* Pull a slot off the free list */
STATIC struct NCR_700_command_slot *
find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
{
	struct NCR_700_command_slot *slot = hostdata->free_list;

	if(slot == NULL) {
		/* sanity check */
		if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
			printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
		return NULL;
	}

	if(slot->state != NCR_700_SLOT_FREE)
		/* should panic! */
		printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
		

	hostdata->free_list = slot->ITL_forw;
	slot->ITL_forw = NULL;


	/* NOTE: set the state to busy here, not queued, since this
	 * indicates the slot is in use and cannot be run by the IRQ
	 * finish routine.  If we cannot queue the command when it
	 * is properly build, we then change to NCR_700_SLOT_QUEUED */
	slot->state = NCR_700_SLOT_BUSY;
533
	slot->flags = 0;
Linus Torvalds's avatar
Linus Torvalds committed
534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580
	hostdata->command_slot_count++;
	
	return slot;
}

STATIC void 
free_slot(struct NCR_700_command_slot *slot,
	  struct NCR_700_Host_Parameters *hostdata)
{
	if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
		printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
	}
	if(slot->state == NCR_700_SLOT_FREE) {
		printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
	}
	
	slot->resume_offset = 0;
	slot->cmnd = NULL;
	slot->state = NCR_700_SLOT_FREE;
	slot->ITL_forw = hostdata->free_list;
	hostdata->free_list = slot;
	hostdata->command_slot_count--;
}


/* This routine really does very little.  The command is indexed on
   the ITL and (if tagged) the ITLQ lists in _queuecommand */
STATIC void
save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
		     struct scsi_cmnd *SCp, __u32 dsp)
{
	/* Its just possible that this gets executed twice */
	if(SCp != NULL) {
		struct NCR_700_command_slot *slot =
			(struct NCR_700_command_slot *)SCp->host_scribble;

		slot->resume_offset = dsp;
	}
	hostdata->state = NCR_700_HOST_FREE;
	hostdata->cmd = NULL;
}

STATIC inline void
NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
	      struct NCR_700_command_slot *slot)
{
	if(SCp->sc_data_direction != DMA_NONE &&
581 582
	   SCp->sc_data_direction != DMA_BIDIRECTIONAL)
		scsi_dma_unmap(SCp);
Linus Torvalds's avatar
Linus Torvalds committed
583 584 585 586 587 588 589 590 591 592
}

STATIC inline void
NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
	       struct scsi_cmnd *SCp, int result)
{
	hostdata->state = NCR_700_HOST_FREE;
	hostdata->cmd = NULL;

	if(SCp != NULL) {
593
		struct NCR_700_command_slot *slot =
Linus Torvalds's avatar
Linus Torvalds committed
594
			(struct NCR_700_command_slot *)SCp->host_scribble;
595

596
		dma_unmap_single(hostdata->dev, slot->pCmd,
597
				 MAX_COMMAND_SIZE, DMA_TO_DEVICE);
598
		if (slot->flags == NCR_700_FLAG_AUTOSENSE) {
599
			char *cmnd = NCR_700_get_sense_cmnd(SCp->device);
Linus Torvalds's avatar
Linus Torvalds committed
600

601 602
			dma_unmap_single(hostdata->dev, slot->dma_handle,
					 SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
Linus Torvalds's avatar
Linus Torvalds committed
603 604
			/* restore the old result if the request sense was
			 * successful */
605
			if (result == 0)
606
				result = cmnd[7];
607 608
			/* restore the original length */
			SCp->cmd_len = cmnd[8];
609
		} else
610
			NCR_700_unmap(hostdata, SCp, slot);
611

Linus Torvalds's avatar
Linus Torvalds committed
612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648
		free_slot(slot, hostdata);
#ifdef NCR_700_DEBUG
		if(NCR_700_get_depth(SCp->device) == 0 ||
		   NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
			printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
			       NCR_700_get_depth(SCp->device));
#endif /* NCR_700_DEBUG */
		NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);

		SCp->host_scribble = NULL;
		SCp->result = result;
		SCp->scsi_done(SCp);
	} else {
		printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
	}
}


STATIC void
NCR_700_internal_bus_reset(struct Scsi_Host *host)
{
	/* Bus reset */
	NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
	udelay(50);
	NCR_700_writeb(0, host, SCNTL1_REG);

}

STATIC void
NCR_700_chip_setup(struct Scsi_Host *host)
{
	struct NCR_700_Host_Parameters *hostdata = 
		(struct NCR_700_Host_Parameters *)host->hostdata[0];
	__u8 min_period;
	__u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);

	if(hostdata->chip710) {
649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668
		__u8 burst_disable = 0;
		__u8 burst_length = 0;

		switch (hostdata->burst_length) {
			case 1:
			        burst_length = BURST_LENGTH_1;
			        break;
			case 2:
			        burst_length = BURST_LENGTH_2;
			        break;
			case 4:
			        burst_length = BURST_LENGTH_4;
			        break;
			case 8:
			        burst_length = BURST_LENGTH_8;
			        break;
			default:
			        burst_disable = BURST_DISABLE;
			        break;
		}
669
		hostdata->dcntl_extra |= COMPAT_700_MODE;
Linus Torvalds's avatar
Linus Torvalds committed
670

671
		NCR_700_writeb(hostdata->dcntl_extra, host, DCNTL_REG);
672
		NCR_700_writeb(burst_length | hostdata->dmode_extra,
Linus Torvalds's avatar
Linus Torvalds committed
673
			       host, DMODE_710_REG);
674 675 676
		NCR_700_writeb(burst_disable | hostdata->ctest7_extra |
			       (hostdata->differential ? DIFF : 0),
			       host, CTEST7_REG);
Linus Torvalds's avatar
Linus Torvalds committed
677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710
		NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
		NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
			       | AUTO_ATN, host, SCNTL0_REG);
	} else {
		NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
			       host, DMODE_700_REG);
		NCR_700_writeb(hostdata->differential ? 
			       DIFF : 0, host, CTEST7_REG);
		if(hostdata->fast) {
			/* this is for 700-66, does nothing on 700 */
			NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION 
				       | GENERATE_RECEIVE_PARITY, host,
				       CTEST8_REG);
		} else {
			NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
				       | PARITY | AUTO_ATN, host, SCNTL0_REG);
		}
	}

	NCR_700_writeb(1 << host->this_id, host, SCID_REG);
	NCR_700_writeb(0, host, SBCL_REG);
	NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);

	NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
	     | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);

	NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
	NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
	if(hostdata->clock > 75) {
		printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
		/* do the best we can, but the async clock will be out
		 * of spec: sync divider 2, async divider 3 */
		DEBUG(("53c700: sync 2 async 3\n"));
		NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
711
		NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
Linus Torvalds's avatar
Linus Torvalds committed
712 713 714 715 716
		hostdata->sync_clock = hostdata->clock/2;
	} else	if(hostdata->clock > 50  && hostdata->clock <= 75) {
		/* sync divider 1.5, async divider 3 */
		DEBUG(("53c700: sync 1.5 async 3\n"));
		NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
717
		NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
Linus Torvalds's avatar
Linus Torvalds committed
718 719 720 721 722 723 724
		hostdata->sync_clock = hostdata->clock*2;
		hostdata->sync_clock /= 3;
		
	} else if(hostdata->clock > 37 && hostdata->clock <= 50) {
		/* sync divider 1, async divider 2 */
		DEBUG(("53c700: sync 1 async 2\n"));
		NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
725
		NCR_700_writeb(ASYNC_DIV_2_0 | hostdata->dcntl_extra, host, DCNTL_REG);
Linus Torvalds's avatar
Linus Torvalds committed
726 727 728 729 730
		hostdata->sync_clock = hostdata->clock;
	} else if(hostdata->clock > 25 && hostdata->clock <=37) {
		/* sync divider 1, async divider 1.5 */
		DEBUG(("53c700: sync 1 async 1.5\n"));
		NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
731
		NCR_700_writeb(ASYNC_DIV_1_5 | hostdata->dcntl_extra, host, DCNTL_REG);
Linus Torvalds's avatar
Linus Torvalds committed
732 733 734 735
		hostdata->sync_clock = hostdata->clock;
	} else {
		DEBUG(("53c700: sync 1 async 1\n"));
		NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
736
		NCR_700_writeb(ASYNC_DIV_1_0 | hostdata->dcntl_extra, host, DCNTL_REG);
Linus Torvalds's avatar
Linus Torvalds committed
737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818
		/* sync divider 1, async divider 1 */
		hostdata->sync_clock = hostdata->clock;
	}
	/* Calculate the actual minimum period that can be supported
	 * by our synchronous clock speed.  See the 710 manual for
	 * exact details of this calculation which is based on a
	 * setting of the SXFER register */
	min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
	hostdata->min_period = NCR_700_MIN_PERIOD;
	if(min_period > NCR_700_MIN_PERIOD)
		hostdata->min_period = min_period;
}

STATIC void
NCR_700_chip_reset(struct Scsi_Host *host)
{
	struct NCR_700_Host_Parameters *hostdata = 
		(struct NCR_700_Host_Parameters *)host->hostdata[0];
	if(hostdata->chip710) {
		NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
		udelay(100);

		NCR_700_writeb(0, host, ISTAT_REG);
	} else {
		NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
		udelay(100);
		
		NCR_700_writeb(0, host, DCNTL_REG);
	}

	mdelay(1000);

	NCR_700_chip_setup(host);
}

/* The heart of the message processing engine is that the instruction
 * immediately after the INT is the normal case (and so must be CLEAR
 * ACK).  If we want to do something else, we call that routine in
 * scripts and set temp to be the normal case + 8 (skipping the CLEAR
 * ACK) so that the routine returns correctly to resume its activity
 * */
STATIC __u32
process_extended_message(struct Scsi_Host *host, 
			 struct NCR_700_Host_Parameters *hostdata,
			 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
{
	__u32 resume_offset = dsp, temp = dsp + 8;
	__u8 pun = 0xff, lun = 0xff;

	if(SCp != NULL) {
		pun = SCp->device->id;
		lun = SCp->device->lun;
	}

	switch(hostdata->msgin[2]) {
	case A_SDTR_MSG:
		if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
			struct scsi_target *starget = SCp->device->sdev_target;
			__u8 period = hostdata->msgin[3];
			__u8 offset = hostdata->msgin[4];

			if(offset == 0 || period == 0) {
				offset = 0;
				period = 0;
			}

			spi_offset(starget) = offset;
			spi_period(starget) = period;
			
			if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
				spi_display_xfer_agreement(starget);
				NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
			}
			
			NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
			NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
			
			NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
				       host, SXFER_REG);

		} else {
			/* SDTR message out of the blue, reject it */
819 820
			shost_printk(KERN_WARNING, host,
				"Unexpected SDTR msg\n");
Linus Torvalds's avatar
Linus Torvalds committed
821
			hostdata->msgout[0] = A_REJECT_MSG;
822 823 824
			dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
			script_patch_16(hostdata->dev, hostdata->script,
			                MessageCount, 1);
Linus Torvalds's avatar
Linus Torvalds committed
825 826 827 828 829 830 831 832 833 834
			/* SendMsgOut returns, so set up the return
			 * address */
			resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
		}
		break;
	
	case A_WDTR_MSG:
		printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
		       host->host_no, pun, lun);
		hostdata->msgout[0] = A_REJECT_MSG;
835 836 837
		dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
		script_patch_16(hostdata->dev, hostdata->script, MessageCount,
		                1);
Linus Torvalds's avatar
Linus Torvalds committed
838 839 840 841 842 843 844 845
		resume_offset = hostdata->pScript + Ent_SendMessageWithATN;

		break;

	default:
		printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
		       host->host_no, pun, lun,
		       NCR_700_phase[(dsps & 0xf00) >> 8]);
846
		spi_print_msg(hostdata->msgin);
Linus Torvalds's avatar
Linus Torvalds committed
847 848 849
		printk("\n");
		/* just reject it */
		hostdata->msgout[0] = A_REJECT_MSG;
850 851 852
		dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
		script_patch_16(hostdata->dev, hostdata->script, MessageCount,
		                1);
Linus Torvalds's avatar
Linus Torvalds committed
853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876
		/* SendMsgOut returns, so set up the return
		 * address */
		resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
	}
	NCR_700_writel(temp, host, TEMP_REG);
	return resume_offset;
}

STATIC __u32
process_message(struct Scsi_Host *host,	struct NCR_700_Host_Parameters *hostdata,
		struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
{
	/* work out where to return to */
	__u32 temp = dsp + 8, resume_offset = dsp;
	__u8 pun = 0xff, lun = 0xff;

	if(SCp != NULL) {
		pun = SCp->device->id;
		lun = SCp->device->lun;
	}

#ifdef NCR_700_DEBUG
	printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
	       NCR_700_phase[(dsps & 0xf00) >> 8]);
877
	spi_print_msg(hostdata->msgin);
Linus Torvalds's avatar
Linus Torvalds committed
878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896
	printk("\n");
#endif

	switch(hostdata->msgin[0]) {

	case A_EXTENDED_MSG:
		resume_offset =  process_extended_message(host, hostdata, SCp,
							  dsp, dsps);
		break;

	case A_REJECT_MSG:
		if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
			/* Rejected our sync negotiation attempt */
			spi_period(SCp->device->sdev_target) =
				spi_offset(SCp->device->sdev_target) = 0;
			NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
			NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
		} else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
			/* rejected our first simple tag message */
897 898
			scmd_printk(KERN_WARNING, SCp,
				"Rejected first tag queue attempt, turning off tag queueing\n");
Linus Torvalds's avatar
Linus Torvalds committed
899 900
			/* we're done negotiating */
			NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
901
			hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
902

Linus Torvalds's avatar
Linus Torvalds committed
903
			SCp->device->tagged_supported = 0;
904
			SCp->device->simple_tags = 0;
905
			scsi_change_queue_depth(SCp->device, host->cmd_per_lun);
Linus Torvalds's avatar
Linus Torvalds committed
906
		} else {
907 908 909
			shost_printk(KERN_WARNING, host,
				"(%d:%d) Unexpected REJECT Message %s\n",
			       pun, lun,
Linus Torvalds's avatar
Linus Torvalds committed
910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930
			       NCR_700_phase[(dsps & 0xf00) >> 8]);
			/* however, just ignore it */
		}
		break;

	case A_PARITY_ERROR_MSG:
		printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
		       pun, lun);
		NCR_700_internal_bus_reset(host);
		break;
	case A_SIMPLE_TAG_MSG:
		printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
		       pun, lun, hostdata->msgin[1],
		       NCR_700_phase[(dsps & 0xf00) >> 8]);
		/* just ignore it */
		break;
	default:
		printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
		       host->host_no, pun, lun,
		       NCR_700_phase[(dsps & 0xf00) >> 8]);

931
		spi_print_msg(hostdata->msgin);
Linus Torvalds's avatar
Linus Torvalds committed
932 933 934
		printk("\n");
		/* just reject it */
		hostdata->msgout[0] = A_REJECT_MSG;
935 936 937
		dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
		script_patch_16(hostdata->dev, hostdata->script, MessageCount,
		                1);
Linus Torvalds's avatar
Linus Torvalds committed
938 939 940 941 942 943 944 945
		/* SendMsgOut returns, so set up the return
		 * address */
		resume_offset = hostdata->pScript + Ent_SendMessageWithATN;

		break;
	}
	NCR_700_writel(temp, host, TEMP_REG);
	/* set us up to receive another message */
946
	dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
Linus Torvalds's avatar
Linus Torvalds committed
947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975
	return resume_offset;
}

STATIC __u32
process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
			 struct Scsi_Host *host,
			 struct NCR_700_Host_Parameters *hostdata)
{
	__u32 resume_offset = 0;
	__u8 pun = 0xff, lun=0xff;

	if(SCp != NULL) {
		pun = SCp->device->id;
		lun = SCp->device->lun;
	}

	if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
		DEBUG(("  COMMAND COMPLETE, status=%02x\n",
		       hostdata->status[0]));
		/* OK, if TCQ still under negotiation, we now know it works */
		if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
			NCR_700_set_tag_neg_state(SCp->device,
						  NCR_700_FINISHED_TAG_NEGOTIATION);
			
		/* check for contingent allegiance contitions */
		if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
		   status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
			struct NCR_700_command_slot *slot =
				(struct NCR_700_command_slot *)SCp->host_scribble;
976
			if(slot->flags == NCR_700_FLAG_AUTOSENSE) {
Linus Torvalds's avatar
Linus Torvalds committed
977 978
				/* OOPS: bad device, returning another
				 * contingent allegiance condition */
979 980
				scmd_printk(KERN_ERR, SCp,
					"broken device is looping in contingent allegiance: ignoring\n");
Linus Torvalds's avatar
Linus Torvalds committed
981 982
				NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
			} else {
983 984
				char *cmnd =
					NCR_700_get_sense_cmnd(SCp->device);
Linus Torvalds's avatar
Linus Torvalds committed
985 986 987 988 989 990 991 992 993 994 995 996 997
#ifdef NCR_DEBUG
				scsi_print_command(SCp);
				printk("  cmd %p has status %d, requesting sense\n",
				       SCp, hostdata->status[0]);
#endif
				/* we can destroy the command here
				 * because the contingent allegiance
				 * condition will cause a retry which
				 * will re-copy the command from the
				 * saved data_cmnd.  We also unmap any
				 * data associated with the command
				 * here */
				NCR_700_unmap(hostdata, SCp, slot);
998
				dma_unmap_single(hostdata->dev, slot->pCmd,
999
						 MAX_COMMAND_SIZE,
1000 1001
						 DMA_TO_DEVICE);

1002
				cmnd[0] = REQUEST_SENSE;
Hannes Reinecke's avatar
Hannes Reinecke committed
1003
				cmnd[1] = (lun & 0x7) << 5;
1004 1005
				cmnd[2] = 0;
				cmnd[3] = 0;
1006
				cmnd[4] = SCSI_SENSE_BUFFERSIZE;
1007
				cmnd[5] = 0;
Linus Torvalds's avatar
Linus Torvalds committed
1008 1009 1010 1011 1012 1013
				/* Here's a quiet hack: the
				 * REQUEST_SENSE command is six bytes,
				 * so store a flag indicating that
				 * this was an internal sense request
				 * and the original status at the end
				 * of the command */
1014 1015
				cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
				cmnd[7] = hostdata->status[0];
1016 1017 1018
				cmnd[8] = SCp->cmd_len;
				SCp->cmd_len = 6; /* command length for
						   * REQUEST_SENSE */
1019
				slot->pCmd = dma_map_single(hostdata->dev, cmnd, MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1020 1021
				slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
				slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | SCSI_SENSE_BUFFERSIZE);
Linus Torvalds's avatar
Linus Torvalds committed
1022 1023 1024 1025
				slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
				slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
				slot->SG[1].pAddr = 0;
				slot->resume_offset = hostdata->pScript;
1026
				dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1027
				dma_cache_sync(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1028

Linus Torvalds's avatar
Linus Torvalds committed
1029 1030
				/* queue the command for reissue */
				slot->state = NCR_700_SLOT_QUEUED;
1031
				slot->flags = NCR_700_FLAG_AUTOSENSE;
Linus Torvalds's avatar
Linus Torvalds committed
1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047
				hostdata->state = NCR_700_HOST_FREE;
				hostdata->cmd = NULL;
			}
		} else {
			// Currently rely on the mid layer evaluation
			// of the tag queuing capability
			//
			//if(status_byte(hostdata->status[0]) == GOOD &&
			//   SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
			//	/* Piggy back the tag queueing support
			//	 * on this command */
			//	dma_sync_single_for_cpu(hostdata->dev,
			//			    slot->dma_handle,
			//			    SCp->request_bufflen,
			//			    DMA_FROM_DEVICE);
			//	if(((char *)SCp->request_buffer)[7] & 0x02) {
1048 1049 1050
			//		scmd_printk(KERN_INFO, SCp,
			//		     "Enabling Tag Command Queuing\n");
			//		hostdata->tag_negotiated |= (1<<scmd_id(SCp));
Linus Torvalds's avatar
Linus Torvalds committed
1051 1052 1053
			//		NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
			//	} else {
			//		NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1054
			//		hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
Linus Torvalds's avatar
Linus Torvalds committed
1055 1056 1057 1058 1059 1060 1061
			//	}
			//}
			NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
		}
	} else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
		__u8 i = (dsps & 0xf00) >> 8;

1062
		scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
Linus Torvalds's avatar
Linus Torvalds committed
1063 1064
		       NCR_700_phase[i],
		       sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1065 1066
		scmd_printk(KERN_ERR, SCp, "         len = %d, cmd =",
			SCp->cmd_len);
Linus Torvalds's avatar
Linus Torvalds committed
1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108
		scsi_print_command(SCp);

		NCR_700_internal_bus_reset(host);
	} else if((dsps & 0xfffff000) == A_FATAL) {
		int i = (dsps & 0xfff);

		printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
		       host->host_no, pun, lun, NCR_700_fatal_messages[i]);
		if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
			printk(KERN_ERR "     msg begins %02x %02x\n",
			       hostdata->msgin[0], hostdata->msgin[1]);
		}
		NCR_700_internal_bus_reset(host);
	} else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
#ifdef NCR_700_DEBUG
		__u8 i = (dsps & 0xf00) >> 8;

		printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
		       host->host_no, pun, lun,
		       i, NCR_700_phase[i]);
#endif
		save_for_reselection(hostdata, SCp, dsp);

	} else if(dsps == A_RESELECTION_IDENTIFIED) {
		__u8 lun;
		struct NCR_700_command_slot *slot;
		__u8 reselection_id = hostdata->reselection_id;
		struct scsi_device *SDp;

		lun = hostdata->msgin[0] & 0x1f;

		hostdata->reselection_id = 0xff;
		DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
		       host->host_no, reselection_id, lun));
		/* clear the reselection indicator */
		SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
		if(unlikely(SDp == NULL)) {
			printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
			       host->host_no, reselection_id, lun);
			BUG();
		}
		if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1109 1110 1111
			struct scsi_cmnd *SCp;

			SCp = scsi_host_find_tag(SDp->host, hostdata->msgin[2]);
Linus Torvalds's avatar
Linus Torvalds committed
1112 1113 1114 1115 1116 1117 1118
			if(unlikely(SCp == NULL)) {
				printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n", 
				       host->host_no, reselection_id, lun, hostdata->msgin[2]);
				BUG();
			}

			slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1119 1120 1121
			DDEBUG(KERN_DEBUG, SDp,
				"reselection is tag %d, slot %p(%d)\n",
				hostdata->msgin[2], slot, slot->tag);
Linus Torvalds's avatar
Linus Torvalds committed
1122
		} else {
1123 1124
			struct NCR_700_Device_Parameters *p = SDp->hostdata;
			struct scsi_cmnd *SCp = p->current_cmnd;
1125

Linus Torvalds's avatar
Linus Torvalds committed
1126
			if(unlikely(SCp == NULL)) {
1127 1128
				sdev_printk(KERN_ERR, SDp,
					"no saved request for untagged cmd\n");
Linus Torvalds's avatar
Linus Torvalds committed
1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146
				BUG();
			}
			slot = (struct NCR_700_command_slot *)SCp->host_scribble;
		}

		if(slot == NULL) {
			printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
			       host->host_no, reselection_id, lun,
			       hostdata->msgin[0], hostdata->msgin[1],
			       hostdata->msgin[2]);
		} else {
			if(hostdata->state != NCR_700_HOST_BUSY)
				printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
				       host->host_no);
			resume_offset = slot->resume_offset;
			hostdata->cmd = slot->cmnd;

			/* re-patch for this command */
1147 1148 1149
			script_patch_32_abs(hostdata->dev, hostdata->script,
			                    CommandAddress, slot->pCmd);
			script_patch_16(hostdata->dev, hostdata->script,
Linus Torvalds's avatar
Linus Torvalds committed
1150
					CommandCount, slot->cmnd->cmd_len);
1151 1152
			script_patch_32_abs(hostdata->dev, hostdata->script,
			                    SGScriptStartAddress,
Linus Torvalds's avatar
Linus Torvalds committed
1153 1154 1155 1156 1157 1158 1159 1160 1161
					    to32bit(&slot->pSG[0].ins));

			/* Note: setting SXFER only works if we're
			 * still in the MESSAGE phase, so it is vital
			 * that ACK is still asserted when we process
			 * the reselection message.  The resume offset
			 * should therefore always clear ACK */
			NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
				       host, SXFER_REG);
1162
			dma_cache_sync(hostdata->dev, hostdata->msgin,
Linus Torvalds's avatar
Linus Torvalds committed
1163
				       MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1164
			dma_cache_sync(hostdata->dev, hostdata->msgout,
Linus Torvalds's avatar
Linus Torvalds committed
1165 1166 1167
				       MSG_ARRAY_SIZE, DMA_TO_DEVICE);
			/* I'm just being paranoid here, the command should
			 * already have been flushed from the cache */
1168
			dma_cache_sync(hostdata->dev, slot->cmnd->cmnd,
Linus Torvalds's avatar
Linus Torvalds committed
1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231
				       slot->cmnd->cmd_len, DMA_TO_DEVICE);


			
		}
	} else if(dsps == A_RESELECTED_DURING_SELECTION) {

		/* This section is full of debugging code because I've
		 * never managed to reach it.  I think what happens is
		 * that, because the 700 runs with selection
		 * interrupts enabled the whole time that we take a
		 * selection interrupt before we manage to get to the
		 * reselected script interrupt */

		__u8 reselection_id = NCR_700_readb(host, SFBR_REG);
		struct NCR_700_command_slot *slot;
		
		/* Take out our own ID */
		reselection_id &= ~(1<<host->this_id);
		
		/* I've never seen this happen, so keep this as a printk rather
		 * than a debug */
		printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
		       host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);

		{
			/* FIXME: DEBUGGING CODE */
			__u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
			int i;

			for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
				if(SG >= to32bit(&hostdata->slots[i].pSG[0])
				   && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
					break;
			}
			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);
			SCp =  hostdata->slots[i].cmnd;
		}

		if(SCp != NULL) {
			slot = (struct NCR_700_command_slot *)SCp->host_scribble;
			/* change slot from busy to queued to redo command */
			slot->state = NCR_700_SLOT_QUEUED;
		}
		hostdata->cmd = NULL;
		
		if(reselection_id == 0) {
			if(hostdata->reselection_id == 0xff) {
				printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
				return 0;
			} else {
				printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
				       host->host_no);
				reselection_id = hostdata->reselection_id;
			}
		} else {
			
			/* convert to real ID */
			reselection_id = bitmap_to_number(reselection_id);
		}
		hostdata->reselection_id = reselection_id;
		/* just in case we have a stale simple tag message, clear it */
		hostdata->msgin[1] = 0;
1232
		dma_cache_sync(hostdata->dev, hostdata->msgin,
Linus Torvalds's avatar
Linus Torvalds committed
1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252
			       MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
		if(hostdata->tag_negotiated & (1<<reselection_id)) {
			resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
		} else {
			resume_offset = hostdata->pScript + Ent_GetReselectionData;
		}
	} else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
		/* we've just disconnected from the bus, do nothing since
		 * a return here will re-run the queued command slot
		 * that may have been interrupted by the initial selection */
		DEBUG((" SELECTION COMPLETED\n"));
	} else if((dsps & 0xfffff0f0) == A_MSG_IN) { 
		resume_offset = process_message(host, hostdata, SCp,
						dsp, dsps);
	} else if((dsps &  0xfffff000) == 0) {
		__u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
		printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
		       host->host_no, pun, lun, NCR_700_condition[i],
		       NCR_700_phase[j], dsp - hostdata->pScript);
		if(SCp != NULL) {
1253
			struct scatterlist *sg;
Linus Torvalds's avatar
Linus Torvalds committed
1254

1255 1256 1257
			scsi_print_command(SCp);
			scsi_for_each_sg(SCp, sg, scsi_sg_count(SCp) + 1, i) {
				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 Torvalds's avatar
Linus Torvalds committed
1258
			}
1259
		}
Linus Torvalds's avatar
Linus Torvalds committed
1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346
		NCR_700_internal_bus_reset(host);
	} else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
		printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
		       host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
		resume_offset = dsp;
	} else {
		printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
		       host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
		NCR_700_internal_bus_reset(host);
	}
	return resume_offset;
}

/* We run the 53c700 with selection interrupts always enabled.  This
 * means that the chip may be selected as soon as the bus frees.  On a
 * busy bus, this can be before the scripts engine finishes its
 * processing.  Therefore, part of the selection processing has to be
 * to find out what the scripts engine is doing and complete the
 * function if necessary (i.e. process the pending disconnect or save
 * the interrupted initial selection */
STATIC inline __u32
process_selection(struct Scsi_Host *host, __u32 dsp)
{
	__u8 id = 0;	/* Squash compiler warning */
	int count = 0;
	__u32 resume_offset = 0;
	struct NCR_700_Host_Parameters *hostdata =
		(struct NCR_700_Host_Parameters *)host->hostdata[0];
	struct scsi_cmnd *SCp = hostdata->cmd;
	__u8 sbcl;

	for(count = 0; count < 5; count++) {
		id = NCR_700_readb(host, hostdata->chip710 ?
				   CTEST9_REG : SFBR_REG);

		/* Take out our own ID */
		id &= ~(1<<host->this_id);
		if(id != 0) 
			break;
		udelay(5);
	}
	sbcl = NCR_700_readb(host, SBCL_REG);
	if((sbcl & SBCL_IO) == 0) {
		/* mark as having been selected rather than reselected */
		id = 0xff;
	} else {
		/* convert to real ID */
		hostdata->reselection_id = id = bitmap_to_number(id);
		DEBUG(("scsi%d:  Reselected by %d\n",
		       host->host_no, id));
	}
	if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
		struct NCR_700_command_slot *slot =
			(struct NCR_700_command_slot *)SCp->host_scribble;
		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));
		
		switch(dsp - hostdata->pScript) {
		case Ent_Disconnect1:
		case Ent_Disconnect2:
			save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
			break;
		case Ent_Disconnect3:
		case Ent_Disconnect4:
			save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
			break;
		case Ent_Disconnect5:
		case Ent_Disconnect6:
			save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
			break;
		case Ent_Disconnect7:
		case Ent_Disconnect8:
			save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
			break;
		case Ent_Finish1:
		case Ent_Finish2:
			process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
			break;
			
		default:
			slot->state = NCR_700_SLOT_QUEUED;
			break;
			}
	}
	hostdata->state = NCR_700_HOST_BUSY;
	hostdata->cmd = NULL;
	/* clear any stale simple tag message */
	hostdata->msgin[1] = 0;
1347
	dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
Linus Torvalds's avatar
Linus Torvalds committed
1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397
		       DMA_BIDIRECTIONAL);

	if(id == 0xff) {
		/* Selected as target, Ignore */
		resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
	} else if(hostdata->tag_negotiated & (1<<id)) {
		resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
	} else {
		resume_offset = hostdata->pScript + Ent_GetReselectionData;
	}
	return resume_offset;
}

static inline void
NCR_700_clear_fifo(struct Scsi_Host *host) {
	const struct NCR_700_Host_Parameters *hostdata
		= (struct NCR_700_Host_Parameters *)host->hostdata[0];
	if(hostdata->chip710) {
		NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
	} else {
		NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
	}
}

static inline void
NCR_700_flush_fifo(struct Scsi_Host *host) {
	const struct NCR_700_Host_Parameters *hostdata
		= (struct NCR_700_Host_Parameters *)host->hostdata[0];
	if(hostdata->chip710) {
		NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
		udelay(10);
		NCR_700_writeb(0, host, CTEST8_REG);
	} else {
		NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
		udelay(10);
		NCR_700_writeb(0, host, DFIFO_REG);
	}
}


/* The queue lock with interrupts disabled must be held on entry to
 * this function */
STATIC int
NCR_700_start_command(struct scsi_cmnd *SCp)
{
	struct NCR_700_command_slot *slot =
		(struct NCR_700_command_slot *)SCp->host_scribble;
	struct NCR_700_Host_Parameters *hostdata =
		(struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
	__u16 count = 1;	/* for IDENTIFY message */
Hannes Reinecke's avatar
Hannes Reinecke committed
1398 1399
	u8 lun = SCp->device->lun;

Linus Torvalds's avatar
Linus Torvalds committed
1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415
	if(hostdata->state != NCR_700_HOST_FREE) {
		/* keep this inside the lock to close the race window where
		 * the running command finishes on another CPU while we don't
		 * change the state to queued on this one */
		slot->state = NCR_700_SLOT_QUEUED;

		DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
		       SCp->device->host->host_no, slot->cmnd, slot));
		return 0;
	}
	hostdata->state = NCR_700_HOST_BUSY;
	hostdata->cmd = SCp;
	slot->state = NCR_700_SLOT_BUSY;
	/* keep interrupts disabled until we have the command correctly
	 * set up so we cannot take a selection interrupt */

1416 1417
	hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&
						slot->flags != NCR_700_FLAG_AUTOSENSE),
Hannes Reinecke's avatar
Hannes Reinecke committed
1418
					       lun);
Linus Torvalds's avatar
Linus Torvalds committed
1419 1420 1421
	/* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
	 * if the negotiated transfer parameters still hold, so
	 * always renegotiate them */
1422 1423
	if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||
	   slot->flags == NCR_700_FLAG_AUTOSENSE) {
Linus Torvalds's avatar
Linus Torvalds committed
1424 1425 1426 1427 1428 1429 1430
		NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
	}

	/* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
	 * If a contingent allegiance condition exists, the device
	 * will refuse all tags, so send the request sense as untagged
	 * */
1431
	if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1432 1433
	   && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&
	       slot->flags != NCR_700_FLAG_AUTOSENSE)) {
1434
		count += spi_populate_tag_msg(&hostdata->msgout[count], SCp);
Linus Torvalds's avatar
Linus Torvalds committed
1435 1436 1437 1438
	}

	if(hostdata->fast &&
	   NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1439 1440 1441
		count += spi_populate_sync_msg(&hostdata->msgout[count],
				spi_period(SCp->device->sdev_target),
				spi_offset(SCp->device->sdev_target));
Linus Torvalds's avatar
Linus Torvalds committed
1442 1443 1444
		NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
	}

1445
	script_patch_16(hostdata->dev, hostdata->script, MessageCount, count);
Linus Torvalds's avatar
Linus Torvalds committed
1446 1447


1448
	script_patch_ID(hostdata->dev, hostdata->script,
1449
			Device_ID, 1<<scmd_id(SCp));
Linus Torvalds's avatar
Linus Torvalds committed
1450

1451
	script_patch_32_abs(hostdata->dev, hostdata->script, CommandAddress,
Linus Torvalds's avatar
Linus Torvalds committed
1452
			    slot->pCmd);
1453 1454
	script_patch_16(hostdata->dev, hostdata->script, CommandCount,
	                SCp->cmd_len);
Linus Torvalds's avatar
Linus Torvalds committed
1455 1456
	/* finally plumb the beginning of the SG list into the script
	 * */
1457 1458
	script_patch_32_abs(hostdata->dev, hostdata->script,
	                    SGScriptStartAddress, to32bit(&slot->pSG[0].ins));
Linus Torvalds's avatar
Linus Torvalds committed
1459 1460 1461 1462 1463
	NCR_700_clear_fifo(SCp->device->host);

	if(slot->resume_offset == 0)
		slot->resume_offset = hostdata->pScript;
	/* now perform all the writebacks and invalidates */
1464 1465
	dma_cache_sync(hostdata->dev, hostdata->msgout, count, DMA_TO_DEVICE);
	dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
Linus Torvalds's avatar
Linus Torvalds committed
1466
		       DMA_FROM_DEVICE);
1467 1468
	dma_cache_sync(hostdata->dev, SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
	dma_cache_sync(hostdata->dev, hostdata->status, 1, DMA_FROM_DEVICE);
Linus Torvalds's avatar
Linus Torvalds committed
1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479

	/* set the synchronous period/offset */
	NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
		       SCp->device->host, SXFER_REG);
	NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
	NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);

	return 1;
}

irqreturn_t
1480
NCR_700_intr(int irq, void *dev_id)
Linus Torvalds's avatar
Linus Torvalds committed
1481 1482 1483 1484 1485 1486 1487 1488 1489 1490
{
	struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
	struct NCR_700_Host_Parameters *hostdata =
		(struct NCR_700_Host_Parameters *)host->hostdata[0];
	__u8 istat;
	__u32 resume_offset = 0;
	__u8 pun = 0xff, lun = 0xff;
	unsigned long flags;
	int handled = 0;

1491
	/* Use the host lock to serialise access to the 53c700
Linus Torvalds's avatar
Linus Torvalds committed
1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546
	 * hardware.  Note: In future, we may need to take the queue
	 * lock to enter the done routines.  When that happens, we
	 * need to ensure that for this driver, the host lock and the
	 * queue lock point to the same thing. */
	spin_lock_irqsave(host->host_lock, flags);
	if((istat = NCR_700_readb(host, ISTAT_REG))
	      & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
		__u32 dsps;
		__u8 sstat0 = 0, dstat = 0;
		__u32 dsp;
		struct scsi_cmnd *SCp = hostdata->cmd;
		enum NCR_700_Host_State state;

		handled = 1;
		state = hostdata->state;
		SCp = hostdata->cmd;

		if(istat & SCSI_INT_PENDING) {
			udelay(10);

			sstat0 = NCR_700_readb(host, SSTAT0_REG);
		}

		if(istat & DMA_INT_PENDING) {
			udelay(10);

			dstat = NCR_700_readb(host, DSTAT_REG);
		}

		dsps = NCR_700_readl(host, DSPS_REG);
		dsp = NCR_700_readl(host, DSP_REG);

		DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
		       host->host_no, istat, sstat0, dstat,
		       (dsp - (__u32)(hostdata->pScript))/4,
		       dsp, dsps));

		if(SCp != NULL) {
			pun = SCp->device->id;
			lun = SCp->device->lun;
		}

		if(sstat0 & SCSI_RESET_DETECTED) {
			struct scsi_device *SDp;
			int i;

			hostdata->state = NCR_700_HOST_BUSY;

			printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
			       host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);

			scsi_report_bus_reset(host, 0);

			/* clear all the negotiated parameters */
			__shost_for_each_device(SDp, host)
1547
				NCR_700_clear_flag(SDp, ~0);
Linus Torvalds's avatar
Linus Torvalds committed
1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643
			
			/* clear all the slots and their pending commands */
			for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
				struct scsi_cmnd *SCp;
				struct NCR_700_command_slot *slot =
					&hostdata->slots[i];

				if(slot->state == NCR_700_SLOT_FREE)
					continue;
				
				SCp = slot->cmnd;
				printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
				       slot, SCp);
				free_slot(slot, hostdata);
				SCp->host_scribble = NULL;
				NCR_700_set_depth(SCp->device, 0);
				/* NOTE: deadlock potential here: we
				 * rely on mid-layer guarantees that
				 * scsi_done won't try to issue the
				 * command again otherwise we'll
				 * deadlock on the
				 * hostdata->state_lock */
				SCp->result = DID_RESET << 16;
				SCp->scsi_done(SCp);
			}
			mdelay(25);
			NCR_700_chip_setup(host);

			hostdata->state = NCR_700_HOST_FREE;
			hostdata->cmd = NULL;
			/* signal back if this was an eh induced reset */
			if(hostdata->eh_complete != NULL)
				complete(hostdata->eh_complete);
			goto out_unlock;
		} else if(sstat0 & SELECTION_TIMEOUT) {
			DEBUG(("scsi%d: (%d:%d) selection timeout\n",
			       host->host_no, pun, lun));
			NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
		} else if(sstat0 & PHASE_MISMATCH) {
			struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
				(struct NCR_700_command_slot *)SCp->host_scribble;

			if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
				/* It wants to reply to some part of
				 * our message */
#ifdef NCR_700_DEBUG
				__u32 temp = NCR_700_readl(host, TEMP_REG);
				int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
				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)));
#endif
				resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
			} else if(dsp >= to32bit(&slot->pSG[0].ins) &&
				  dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
				int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
				int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
				int residual = NCR_700_data_residual(host);
				int i;
#ifdef NCR_700_DEBUG
				__u32 naddr = NCR_700_readl(host, DNAD_REG);

				printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
				       host->host_no, pun, lun,
				       SGcount, data_transfer);
				scsi_print_command(SCp);
				if(residual) {
					printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
				       host->host_no, pun, lun,
				       SGcount, data_transfer, residual);
				}
#endif
				data_transfer += residual;

				if(data_transfer != 0) {
					int count; 
					__u32 pAddr;

					SGcount--;

					count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
					DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
					slot->SG[SGcount].ins &= bS_to_host(0xff000000);
					slot->SG[SGcount].ins |= bS_to_host(data_transfer);
					pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
					pAddr += (count - data_transfer);
#ifdef NCR_700_DEBUG
					if(pAddr != naddr) {
						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);
					}
#endif
					slot->SG[SGcount].pAddr = bS_to_host(pAddr);
				}
				/* set the executed moves to nops */
				for(i=0; i<SGcount; i++) {
					slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
					slot->SG[i].pAddr = 0;
				}
1644
				dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
Linus Torvalds's avatar
Linus Torvalds committed
1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750
				/* and pretend we disconnected after
				 * the command phase */
				resume_offset = hostdata->pScript + Ent_MsgInDuringData;
				/* make sure all the data is flushed */
				NCR_700_flush_fifo(host);
			} else {
				__u8 sbcl = NCR_700_readb(host, SBCL_REG);
				printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
				       host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
				NCR_700_internal_bus_reset(host);
			}

		} else if(sstat0 & SCSI_GROSS_ERROR) {
			printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
			       host->host_no, pun, lun);
			NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
		} else if(sstat0 & PARITY_ERROR) {
			printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
			       host->host_no, pun, lun);
			NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
		} else if(dstat & SCRIPT_INT_RECEIVED) {
			DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
			       host->host_no, pun, lun));
			resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
		} else if(dstat & (ILGL_INST_DETECTED)) {
			printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
			       "         Please email James.Bottomley@HansenPartnership.com with the details\n",
			       host->host_no, pun, lun,
			       dsp, dsp - hostdata->pScript);
			NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
		} else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
			printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
			       host->host_no, pun, lun, dstat);
			NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
		}

		
		/* NOTE: selection interrupt processing MUST occur
		 * after script interrupt processing to correctly cope
		 * with the case where we process a disconnect and
		 * then get reselected before we process the
		 * disconnection */
		if(sstat0 & SELECTED) {
			/* FIXME: It currently takes at least FOUR
			 * interrupts to complete a command that
			 * disconnects: one for the disconnect, one
			 * for the reselection, one to get the
			 * reselection data and one to complete the
			 * command.  If we guess the reselected
			 * command here and prepare it, we only need
			 * to get a reselection data interrupt if we
			 * guessed wrongly.  Since the interrupt
			 * overhead is much greater than the command
			 * setup, this would be an efficient
			 * optimisation particularly as we probably
			 * only have one outstanding command on a
			 * target most of the time */

			resume_offset = process_selection(host, dsp);

		}

	}

	if(resume_offset) {
		if(hostdata->state != NCR_700_HOST_BUSY) {
			printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
			       host->host_no, resume_offset, resume_offset - hostdata->pScript);
			hostdata->state = NCR_700_HOST_BUSY;
		}

		DEBUG(("Attempting to resume at %x\n", resume_offset));
		NCR_700_clear_fifo(host);
		NCR_700_writel(resume_offset, host, DSP_REG);
	} 
	/* There is probably a technical no-no about this: If we're a
	 * shared interrupt and we got this interrupt because the
	 * other device needs servicing not us, we're still going to
	 * check our queued commands here---of course, there shouldn't
	 * be any outstanding.... */
	if(hostdata->state == NCR_700_HOST_FREE) {
		int i;

		for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
			/* fairness: always run the queue from the last
			 * position we left off */
			int j = (i + hostdata->saved_slot_position)
				% NCR_700_COMMAND_SLOTS_PER_HOST;
			
			if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
				continue;
			if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
				DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
				       host->host_no, &hostdata->slots[j],
				       hostdata->slots[j].cmnd));
				hostdata->saved_slot_position = j + 1;
			}

			break;
		}
	}
 out_unlock:
	spin_unlock_irqrestore(host->host_lock, flags);
	return IRQ_RETVAL(handled);
}

Jeff Garzik's avatar
Jeff Garzik committed
1751 1752
static int
NCR_700_queuecommand_lck(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
Linus Torvalds's avatar
Linus Torvalds committed
1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772
{
	struct NCR_700_Host_Parameters *hostdata = 
		(struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
	__u32 move_ins;
	enum dma_data_direction direction;
	struct NCR_700_command_slot *slot;

	if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
		/* We're over our allocation, this should never happen
		 * since we report the max allocation to the mid layer */
		printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
		return 1;
	}
	/* check for untagged commands.  We cannot have any outstanding
	 * commands if we accept them.  Commands could be untagged because:
	 *
	 * - The tag negotiated bitmap is clear
	 * - The blk layer sent and untagged command
	 */
	if(NCR_700_get_depth(SCp->device) != 0
1773
	   && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1774
	       || !(SCp->flags & SCMD_TAGGED))) {
1775 1776
		CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
		       NCR_700_get_depth(SCp->device));
Linus Torvalds's avatar
Linus Torvalds committed
1777 1778 1779
		return SCSI_MLQUEUE_DEVICE_BUSY;
	}
	if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1780 1781
		CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
		       NCR_700_get_depth(SCp->device));
Linus Torvalds's avatar
Linus Torvalds committed
1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801
		return SCSI_MLQUEUE_DEVICE_BUSY;
	}
	NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);

	/* begin the command here */
	/* no need to check for NULL, test for command_slot_count above
	 * ensures a slot is free */
	slot = find_empty_slot(hostdata);

	slot->cmnd = SCp;

	SCp->scsi_done = done;
	SCp->host_scribble = (unsigned char *)slot;
	SCp->SCp.ptr = NULL;
	SCp->SCp.buffer = NULL;

#ifdef NCR_700_DEBUG
	printk("53c700: scsi%d, command ", SCp->device->host->host_no);
	scsi_print_command(SCp);
#endif
1802
	if ((SCp->flags & SCMD_TAGGED)
1803
	   && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
Linus Torvalds's avatar
Linus Torvalds committed
1804
	   && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1805 1806
		scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
		hostdata->tag_negotiated |= (1<<scmd_id(SCp));
Linus Torvalds's avatar
Linus Torvalds committed
1807 1808 1809 1810 1811 1812 1813 1814 1815
		NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
	}

	/* here we may have to process an untagged command.  The gate
	 * above ensures that this will be the only one outstanding,
	 * so clear the tag negotiated bit.
	 *
	 * FIXME: This will royally screw up on multiple LUN devices
	 * */
1816
	if (!(SCp->flags & SCMD_TAGGED)
1817 1818 1819
	   && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
		scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
		hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
Linus Torvalds's avatar
Linus Torvalds committed
1820 1821
	}

1822 1823
	if ((hostdata->tag_negotiated & (1<<scmd_id(SCp))) &&
	    SCp->device->simple_tags) {
Linus Torvalds's avatar
Linus Torvalds committed
1824
		slot->tag = SCp->request->tag;
1825 1826
		CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
		       slot->tag, slot);
Linus Torvalds's avatar
Linus Torvalds committed
1827
	} else {
1828 1829
		struct NCR_700_Device_Parameters *p = SCp->device->hostdata;

Linus Torvalds's avatar
Linus Torvalds committed
1830
		slot->tag = SCSI_NO_TAG;
1831
		/* save current command for reselection */
1832
		p->current_cmnd = SCp;
Linus Torvalds's avatar
Linus Torvalds committed
1833 1834 1835
	}
	/* sanity check: some of the commands generated by the mid-layer
	 * have an eccentric idea of their sc_data_direction */
1836 1837
	if(!scsi_sg_count(SCp) && !scsi_bufflen(SCp) &&
	   SCp->sc_data_direction != DMA_NONE) {
Linus Torvalds's avatar
Linus Torvalds committed
1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878
#ifdef NCR_700_DEBUG
		printk("53c700: Command");
		scsi_print_command(SCp);
		printk("Has wrong data direction %d\n", SCp->sc_data_direction);
#endif
		SCp->sc_data_direction = DMA_NONE;
	}

	switch (SCp->cmnd[0]) {
	case REQUEST_SENSE:
		/* clear the internal sense magic */
		SCp->cmnd[6] = 0;
		/* fall through */
	default:
		/* OK, get it from the command */
		switch(SCp->sc_data_direction) {
		case DMA_BIDIRECTIONAL:
		default:
			printk(KERN_ERR "53c700: Unknown command for data direction ");
			scsi_print_command(SCp);
			
			move_ins = 0;
			break;
		case DMA_NONE:
			move_ins = 0;
			break;
		case DMA_FROM_DEVICE:
			move_ins = SCRIPT_MOVE_DATA_IN;
			break;
		case DMA_TO_DEVICE:
			move_ins = SCRIPT_MOVE_DATA_OUT;
			break;
		}
	}

	/* now build the scatter gather list */
	direction = SCp->sc_data_direction;
	if(move_ins != 0) {
		int i;
		int sg_count;
		dma_addr_t vPtr = 0;
1879
		struct scatterlist *sg;
Linus Torvalds's avatar
Linus Torvalds committed
1880 1881
		__u32 count = 0;

1882 1883
		sg_count = scsi_dma_map(SCp);
		BUG_ON(sg_count < 0);
Linus Torvalds's avatar
Linus Torvalds committed
1884

1885 1886 1887
		scsi_for_each_sg(SCp, sg, sg_count, i) {
			vPtr = sg_dma_address(sg);
			count = sg_dma_len(sg);
Linus Torvalds's avatar
Linus Torvalds committed
1888 1889 1890 1891 1892 1893 1894 1895

			slot->SG[i].ins = bS_to_host(move_ins | count);
			DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
			       i, count, slot->SG[i].ins, (unsigned long)vPtr));
			slot->SG[i].pAddr = bS_to_host(vPtr);
		}
		slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
		slot->SG[i].pAddr = 0;
1896
		dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1897
		DEBUG((" SETTING %p to %x\n",
1898
		       (&slot->pSG[i].ins),
Linus Torvalds's avatar
Linus Torvalds committed
1899 1900 1901 1902
		       slot->SG[i].ins));
	}
	slot->resume_offset = 0;
	slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1903
				    MAX_COMMAND_SIZE, DMA_TO_DEVICE);
Linus Torvalds's avatar
Linus Torvalds committed
1904 1905 1906 1907
	NCR_700_start_command(SCp);
	return 0;
}

Jeff Garzik's avatar
Jeff Garzik committed
1908 1909
STATIC DEF_SCSI_QCMD(NCR_700_queuecommand)

Linus Torvalds's avatar
Linus Torvalds committed
1910 1911 1912 1913 1914
STATIC int
NCR_700_abort(struct scsi_cmnd * SCp)
{
	struct NCR_700_command_slot *slot;

1915
	scmd_printk(KERN_INFO, SCp, "abort command\n");
Linus Torvalds's avatar
Linus Torvalds committed
1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942

	slot = (struct NCR_700_command_slot *)SCp->host_scribble;

	if(slot == NULL)
		/* no outstanding command to abort */
		return SUCCESS;
	if(SCp->cmnd[0] == TEST_UNIT_READY) {
		/* FIXME: This is because of a problem in the new
		 * error handler.  When it is in error recovery, it
		 * will send a TUR to a device it thinks may still be
		 * showing a problem.  If the TUR isn't responded to,
		 * it will abort it and mark the device off line.
		 * Unfortunately, it does no other error recovery, so
		 * this would leave us with an outstanding command
		 * occupying a slot.  Rather than allow this to
		 * happen, we issue a bus reset to force all
		 * outstanding commands to terminate here. */
		NCR_700_internal_bus_reset(SCp->device->host);
		/* still drop through and return failed */
	}
	return FAILED;

}

STATIC int
NCR_700_bus_reset(struct scsi_cmnd * SCp)
{
1943
	DECLARE_COMPLETION_ONSTACK(complete);
Linus Torvalds's avatar
Linus Torvalds committed
1944 1945 1946
	struct NCR_700_Host_Parameters *hostdata = 
		(struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];

1947 1948
	scmd_printk(KERN_INFO, SCp,
		"New error handler wants BUS reset, cmd %p\n\t", SCp);
Linus Torvalds's avatar
Linus Torvalds committed
1949
	scsi_print_command(SCp);
1950

Linus Torvalds's avatar
Linus Torvalds committed
1951 1952 1953
	/* In theory, eh_complete should always be null because the
	 * eh is single threaded, but just in case we're handling a
	 * reset via sg or something */
1954 1955
	spin_lock_irq(SCp->device->host->host_lock);
	while (hostdata->eh_complete != NULL) {
Linus Torvalds's avatar
Linus Torvalds committed
1956 1957 1958 1959
		spin_unlock_irq(SCp->device->host->host_lock);
		msleep_interruptible(100);
		spin_lock_irq(SCp->device->host->host_lock);
	}
1960

Linus Torvalds's avatar
Linus Torvalds committed
1961 1962
	hostdata->eh_complete = &complete;
	NCR_700_internal_bus_reset(SCp->device->host);
1963

Linus Torvalds's avatar
Linus Torvalds committed
1964 1965 1966
	spin_unlock_irq(SCp->device->host->host_lock);
	wait_for_completion(&complete);
	spin_lock_irq(SCp->device->host->host_lock);
1967

Linus Torvalds's avatar
Linus Torvalds committed
1968 1969 1970 1971
	hostdata->eh_complete = NULL;
	/* Revalidate the transport parameters of the failing device */
	if(hostdata->fast)
		spi_schedule_dv_device(SCp->device);
1972 1973

	spin_unlock_irq(SCp->device->host->host_lock);
Linus Torvalds's avatar
Linus Torvalds committed
1974 1975 1976 1977 1978 1979
	return SUCCESS;
}

STATIC int
NCR_700_host_reset(struct scsi_cmnd * SCp)
{
1980
	scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset<