atari_NCR5380.c 89.0 KB
Newer Older
1
/*
L
Linus Torvalds 已提交
2
 * NCR 5380 generic driver routines.  These should make it *trivial*
3
 *	to implement 5380 SCSI drivers under Linux with a non-trantor
L
Linus Torvalds 已提交
4 5 6 7 8
 *	architecture.
 *
 *	Note that these routines also work with NR53c400 family chips.
 *
 * Copyright 1993, Drew Eckhardt
9
 *	Visionary Computing
L
Linus Torvalds 已提交
10
 *	(Unix and Linux consulting and custom programming)
11
 *	drew@colorado.edu
L
Linus Torvalds 已提交
12 13
 *	+1 (303) 666-5836
 *
14
 * For more information, please consult
L
Linus Torvalds 已提交
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
 *
 * NCR 5380 Family
 * SCSI Protocol Controller
 * Databook
 *
 * NCR Microelectronics
 * 1635 Aeroplaza Drive
 * Colorado Springs, CO 80916
 * 1+ (719) 578-3400
 * 1+ (800) 334-5454
 */

/*
 * ++roman: To port the 5380 driver to the Atari, I had to do some changes in
 * this file, too:
 *
 *  - Some of the debug statements were incorrect (undefined variables and the
 *    like). I fixed that.
 *
 *  - In information_transfer(), I think a #ifdef was wrong. Looking at the
 *    possible DMA transfer size should also happen for REAL_DMA. I added this
 *    in the #if statement.
 *
 *  - When using real DMA, information_transfer() should return in a DATAOUT
 *    phase after starting the DMA. It has nothing more to do.
 *
 *  - The interrupt service routine should run main after end of DMA, too (not
 *    only after RESELECTION interrupts). Additionally, it should _not_ test
 *    for more interrupts after running main, since a DMA process may have
 *    been started and interrupts are turned on now. The new int could happen
 *    inside the execution of NCR5380_intr(), leading to recursive
 *    calls.
 *
 *  - I've added a function merge_contiguous_buffers() that tries to
 *    merge scatter-gather buffers that are located at contiguous
 *    physical addresses and can be processed with the same DMA setup.
 *    Since most scatter-gather operations work on a page (4K) of
 *    4 buffers (1K), in more than 90% of all cases three interrupts and
 *    DMA setup actions are saved.
 *
 * - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA
 *    and USLEEP, because these were messing up readability and will never be
 *    needed for Atari SCSI.
58
 *
L
Linus Torvalds 已提交
59 60 61 62 63 64 65 66 67 68 69
 * - I've revised the NCR5380_main() calling scheme (relax the 'main_running'
 *   stuff), and 'main' is executed in a bottom half if awoken by an
 *   interrupt.
 *
 * - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..."
 *   constructs. In my eyes, this made the source rather unreadable, so I
 *   finally replaced that by the *_PRINTK() macros.
 *
 */

/*
70 71
 * Further development / testing that should be done :
 * 1.  Test linked command handling code after Eric is ready with
L
Linus Torvalds 已提交
72 73
 *     the high level code.
 */
74 75 76

/* Adapted for the sun3 by Sam Creasey. */

已提交
77
#include <scsi/scsi_dbg.h>
78
#include <scsi/scsi_transport_spi.h>
L
Linus Torvalds 已提交
79 80

#if (NDEBUG & NDEBUG_LISTS)
81 82 83 84 85 86 87 88 89 90 91 92 93 94 95
#define LIST(x, y)						\
	do {							\
		printk("LINE:%d   Adding %p to %p\n",		\
		       __LINE__, (void*)(x), (void*)(y));	\
		if ((x) == (y))					\
			udelay(5);				\
	} while (0)
#define REMOVE(w, x, y, z)					\
	do {							\
		printk("LINE:%d   Removing: %p->%p  %p->%p \n",	\
		       __LINE__, (void*)(w), (void*)(x),	\
		       (void*)(y), (void*)(z));			\
		if ((x) == (y))					\
			udelay(5);				\
	} while (0)
L
Linus Torvalds 已提交
96 97 98 99 100 101 102 103 104 105 106 107
#else
#define LIST(x,y)
#define REMOVE(w,x,y,z)
#endif

#ifndef notyet
#undef LINKED
#endif

/*
 * Design
 *
108
 * This is a generic 5380 driver.  To use it on a different platform,
L
Linus Torvalds 已提交
109
 * one simply writes appropriate system specific macros (ie, data
110
 * transfer - some PC's will use the I/O bus, 68K's must use
L
Linus Torvalds 已提交
111 112
 * memory mapped) and drops this file in their 'C' wrapper.
 *
113
 * As far as command queueing, two queues are maintained for
L
Linus Torvalds 已提交
114
 * each 5380 in the system - commands that haven't been issued yet,
115 116 117 118 119
 * and commands that are currently executing.  This means that an
 * unlimited number of commands may be queued, letting
 * more commands propagate from the higher driver levels giving higher
 * throughput.  Note that both I_T_L and I_T_L_Q nexuses are supported,
 * allowing multiple commands to propagate all the way to a SCSI-II device
L
Linus Torvalds 已提交
120 121 122
 * while a command is already executing.
 *
 *
123
 * Issues specific to the NCR5380 :
L
Linus Torvalds 已提交
124
 *
125 126 127 128
 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
 * piece of hardware that requires you to sit in a loop polling for
 * the REQ signal as long as you are connected.  Some devices are
 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
L
Linus Torvalds 已提交
129
 * while doing long seek operations.
130
 *
L
Linus Torvalds 已提交
131 132
 * The workaround for this is to keep track of devices that have
 * disconnected.  If the device hasn't disconnected, for commands that
133
 * should disconnect, we do something like
L
Linus Torvalds 已提交
134 135
 *
 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
136 137
 *
 * Some tweaking of N and M needs to be done.  An algorithm based
L
Linus Torvalds 已提交
138
 * on "time to data" would give the best results as long as short time
139
 * to datas (ie, on the same track) were considered, however these
L
Linus Torvalds 已提交
140 141 142 143 144 145
 * broken devices are the exception rather than the rule and I'd rather
 * spend my time optimizing for the normal case.
 *
 * Architecture :
 *
 * At the heart of the design is a coroutine, NCR5380_main,
F
Finn Thain 已提交
146 147 148 149
 * which is started from a workqueue for each NCR5380 host in the
 * system.  It attempts to establish I_T_L or I_T_L_Q nexuses by
 * removing the commands from the issue queue and calling
 * NCR5380_select() if a nexus is not established.
L
Linus Torvalds 已提交
150 151 152 153 154
 *
 * Once a nexus is established, the NCR5380_information_transfer()
 * phase goes through the various phases as instructed by the target.
 * if the target goes into MSG IN and sends a DISCONNECT message,
 * the command structure is placed into the per instance disconnected
F
Finn Thain 已提交
155 156
 * queue, and NCR5380_main tries to find more work.  If the target is
 * idle for too long, the system will try to sleep.
L
Linus Torvalds 已提交
157 158 159 160 161
 *
 * If a command has disconnected, eventually an interrupt will trigger,
 * calling NCR5380_intr()  which will in turn call NCR5380_reselect
 * to reestablish a nexus.  This will run main if necessary.
 *
162
 * On command termination, the done function will be called as
L
Linus Torvalds 已提交
163 164
 * appropriate.
 *
165
 * SCSI pointers are maintained in the SCp field of SCSI command
L
Linus Torvalds 已提交
166 167 168 169 170 171 172 173 174
 * structures, being initialized after the command is connected
 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
 * Note that in violation of the standard, an implicit SAVE POINTERS operation
 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
 */

/*
 * Using this file :
 * This file a skeleton Linux SCSI driver for the NCR 5380 series
175
 * of chips.  To use it, you write an architecture specific functions
L
Linus Torvalds 已提交
176 177
 * and macros and include this file in your driver.
 *
178
 * These macros control options :
L
Linus Torvalds 已提交
179
 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
180
 *	for commands that return with a CHECK CONDITION status.
L
Linus Torvalds 已提交
181
 *
F
Finn Thain 已提交
182 183 184
 * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential
 *	transceivers.
 *
L
Linus Torvalds 已提交
185 186 187 188 189 190 191
 * LINKED - if defined, linked commands are supported.
 *
 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
 *
 * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible
 *
 * These macros MUST be defined :
192
 *
L
Linus Torvalds 已提交
193 194
 * NCR5380_read(register)  - read from the specified register
 *
195
 * NCR5380_write(register, value) - write to the specific register
L
Linus Torvalds 已提交
196
 *
F
Finn Thain 已提交
197 198 199
 * NCR5380_implementation_fields  - additional fields needed for this
 *      specific implementation of the NCR5380
 *
L
Linus Torvalds 已提交
200
 * Either real DMA *or* pseudo DMA may be implemented
201
 * REAL functions :
L
Linus Torvalds 已提交
202
 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
203
 * Note that the DMA setup functions should return the number of bytes
L
Linus Torvalds 已提交
204 205
 *	that they were able to program the controller for.
 *
206
 * Also note that generic i386/PC versions of these macros are
L
Linus Torvalds 已提交
207 208 209 210 211 212 213 214 215 216 217 218
 *	available as NCR5380_i386_dma_write_setup,
 *	NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
 *
 * NCR5380_dma_write_setup(instance, src, count) - initialize
 * NCR5380_dma_read_setup(instance, dst, count) - initialize
 * NCR5380_dma_residual(instance); - residual count
 *
 * PSEUDO functions :
 * NCR5380_pwrite(instance, src, count)
 * NCR5380_pread(instance, dst, count);
 *
 * The generic driver is initialized by calling NCR5380_init(instance),
219
 * after setting the appropriate host specific fields and ID.  If the
L
Linus Torvalds 已提交
220
 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
F
Finn Thain 已提交
221
 * possible) function may be used.
L
Linus Torvalds 已提交
222 223 224 225 226 227 228 229
 */

/* Macros ease life... :-) */
#define	SETUP_HOSTDATA(in)				\
    struct NCR5380_hostdata *hostdata =			\
	(struct NCR5380_hostdata *)(in)->hostdata
#define	HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata)

F
Finn Thain 已提交
230
#define	NEXT(cmd)		((struct scsi_cmnd *)(cmd)->host_scribble)
231
#define	SET_NEXT(cmd,next)	((cmd)->host_scribble = (void *)(next))
F
Finn Thain 已提交
232
#define	NEXTADDR(cmd)		((struct scsi_cmnd **)&(cmd)->host_scribble)
L
Linus Torvalds 已提交
233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273

#define	HOSTNO		instance->host_no
#define	H_NO(cmd)	(cmd)->device->host->host_no

#ifdef SUPPORT_TAGS

/*
 * Functions for handling tagged queuing
 * =====================================
 *
 * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes:
 *
 * Using consecutive numbers for the tags is no good idea in my eyes. There
 * could be wrong re-usings if the counter (8 bit!) wraps and some early
 * command has been preempted for a long time. My solution: a bitfield for
 * remembering used tags.
 *
 * There's also the problem that each target has a certain queue size, but we
 * cannot know it in advance :-( We just see a QUEUE_FULL status being
 * returned. So, in this case, the driver internal queue size assumption is
 * reduced to the number of active tags if QUEUE_FULL is returned by the
 * target. The command is returned to the mid-level, but with status changed
 * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL
 * correctly.
 *
 * We're also not allowed running tagged commands as long as an untagged
 * command is active. And REQUEST SENSE commands after a contingent allegiance
 * condition _must_ be untagged. To keep track whether an untagged command has
 * been issued, the host->busy array is still employed, as it is without
 * support for tagged queuing.
 *
 * One could suspect that there are possible race conditions between
 * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the
 * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(),
 * which already guaranteed to be running at most once. It is also the only
 * place where tags/LUNs are allocated. So no other allocation can slip
 * between that pair, there could only happen a reselection, which can free a
 * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes
 * important: the tag bit must be cleared before 'nr_allocated' is decreased.
 */

274
static void __init init_tags(struct NCR5380_hostdata *hostdata)
L
Linus Torvalds 已提交
275
{
276
	int target, lun;
277
	struct tag_alloc *ta;
278

279
	if (!(hostdata->flags & FLAG_TAGGED_QUEUING))
280 281 282 283
		return;

	for (target = 0; target < 8; ++target) {
		for (lun = 0; lun < 8; ++lun) {
284
			ta = &hostdata->TagAlloc[target][lun];
285 286 287 288 289 290 291 292
			bitmap_zero(ta->allocated, MAX_TAGS);
			ta->nr_allocated = 0;
			/* At the beginning, assume the maximum queue size we could
			 * support (MAX_TAGS). This value will be decreased if the target
			 * returns QUEUE_FULL status.
			 */
			ta->queue_size = MAX_TAGS;
		}
L
Linus Torvalds 已提交
293 294 295 296 297 298 299 300 301
	}
}


/* Check if we can issue a command to this LUN: First see if the LUN is marked
 * busy by an untagged command. If the command should use tagged queuing, also
 * check that there is a free tag and the target's queue won't overflow. This
 * function should be called with interrupts disabled to avoid race
 * conditions.
302
 */
L
Linus Torvalds 已提交
303

F
Finn Thain 已提交
304
static int is_lun_busy(struct scsi_cmnd *cmd, int should_be_tagged)
L
Linus Torvalds 已提交
305
{
H
Hannes Reinecke 已提交
306
	u8 lun = cmd->device->lun;
307 308
	SETUP_HOSTDATA(cmd->device->host);

H
Hannes Reinecke 已提交
309
	if (hostdata->busy[cmd->device->id] & (1 << lun))
310 311
		return 1;
	if (!should_be_tagged ||
312 313
	    !(hostdata->flags & FLAG_TAGGED_QUEUING) ||
	    !cmd->device->tagged_supported)
314
		return 0;
315 316
	if (hostdata->TagAlloc[scmd_id(cmd)][lun].nr_allocated >=
	    hostdata->TagAlloc[scmd_id(cmd)][lun].queue_size) {
F
Finn Thain 已提交
317
		dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d: no free tags\n",
H
Hannes Reinecke 已提交
318
			   H_NO(cmd), cmd->device->id, lun);
319 320 321
		return 1;
	}
	return 0;
L
Linus Torvalds 已提交
322 323 324 325 326 327 328 329
}


/* Allocate a tag for a command (there are no checks anymore, check_lun_busy()
 * must be called before!), or reserve the LUN in 'busy' if the command is
 * untagged.
 */

F
Finn Thain 已提交
330
static void cmd_get_tag(struct scsi_cmnd *cmd, int should_be_tagged)
L
Linus Torvalds 已提交
331
{
H
Hannes Reinecke 已提交
332
	u8 lun = cmd->device->lun;
333 334 335 336 337 338
	SETUP_HOSTDATA(cmd->device->host);

	/* If we or the target don't support tagged queuing, allocate the LUN for
	 * an untagged command.
	 */
	if (!should_be_tagged ||
339 340
	    !(hostdata->flags & FLAG_TAGGED_QUEUING) ||
	    !cmd->device->tagged_supported) {
341
		cmd->tag = TAG_NONE;
H
Hannes Reinecke 已提交
342
		hostdata->busy[cmd->device->id] |= (1 << lun);
F
Finn Thain 已提交
343
		dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d now allocated by untagged "
H
Hannes Reinecke 已提交
344
			   "command\n", H_NO(cmd), cmd->device->id, lun);
345
	} else {
346
		struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][lun];
347 348 349 350

		cmd->tag = find_first_zero_bit(ta->allocated, MAX_TAGS);
		set_bit(cmd->tag, ta->allocated);
		ta->nr_allocated++;
F
Finn Thain 已提交
351
		dprintk(NDEBUG_TAGS, "scsi%d: using tag %d for target %d lun %d "
352 353
			   "(now %d tags in use)\n",
			   H_NO(cmd), cmd->tag, cmd->device->id,
H
Hannes Reinecke 已提交
354
			   lun, ta->nr_allocated);
355
	}
L
Linus Torvalds 已提交
356 357 358 359 360 361 362
}


/* Mark the tag of command 'cmd' as free, or in case of an untagged command,
 * unlock the LUN.
 */

F
Finn Thain 已提交
363
static void cmd_free_tag(struct scsi_cmnd *cmd)
L
Linus Torvalds 已提交
364
{
H
Hannes Reinecke 已提交
365
	u8 lun = cmd->device->lun;
366 367 368
	SETUP_HOSTDATA(cmd->device->host);

	if (cmd->tag == TAG_NONE) {
H
Hannes Reinecke 已提交
369
		hostdata->busy[cmd->device->id] &= ~(1 << lun);
F
Finn Thain 已提交
370
		dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d untagged cmd finished\n",
H
Hannes Reinecke 已提交
371
			   H_NO(cmd), cmd->device->id, lun);
372 373 374 375
	} else if (cmd->tag >= MAX_TAGS) {
		printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n",
		       H_NO(cmd), cmd->tag);
	} else {
376
		struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][lun];
377 378
		clear_bit(cmd->tag, ta->allocated);
		ta->nr_allocated--;
F
Finn Thain 已提交
379
		dprintk(NDEBUG_TAGS, "scsi%d: freed tag %d for target %d lun %d\n",
H
Hannes Reinecke 已提交
380
			   H_NO(cmd), cmd->tag, cmd->device->id, lun);
381
	}
L
Linus Torvalds 已提交
382 383 384
}


385
static void free_all_tags(struct NCR5380_hostdata *hostdata)
L
Linus Torvalds 已提交
386
{
387
	int target, lun;
388
	struct tag_alloc *ta;
389

390
	if (!(hostdata->flags & FLAG_TAGGED_QUEUING))
391 392 393 394
		return;

	for (target = 0; target < 8; ++target) {
		for (lun = 0; lun < 8; ++lun) {
395
			ta = &hostdata->TagAlloc[target][lun];
396 397 398
			bitmap_zero(ta->allocated, MAX_TAGS);
			ta->nr_allocated = 0;
		}
L
Linus Torvalds 已提交
399 400 401 402 403 404 405
	}
}

#endif /* SUPPORT_TAGS */


/*
F
Finn Thain 已提交
406
 * Function: void merge_contiguous_buffers( struct scsi_cmnd *cmd )
L
Linus Torvalds 已提交
407 408 409 410 411
 *
 * Purpose: Try to merge several scatter-gather requests into one DMA
 *    transfer. This is possible if the scatter buffers lie on
 *    physical contiguous addresses.
 *
F
Finn Thain 已提交
412
 * Parameters: struct scsi_cmnd *cmd
L
Linus Torvalds 已提交
413
 *    The command to work on. The first scatter buffer's data are
L
Lucas De Marchi 已提交
414
 *    assumed to be already transferred into ptr/this_residual.
L
Linus Torvalds 已提交
415 416
 */

F
Finn Thain 已提交
417
static void merge_contiguous_buffers(struct scsi_cmnd *cmd)
L
Linus Torvalds 已提交
418
{
419
#if !defined(CONFIG_SUN3)
420
	unsigned long endaddr;
L
Linus Torvalds 已提交
421
#if (NDEBUG & NDEBUG_MERGING)
422 423
	unsigned long oldlen = cmd->SCp.this_residual;
	int cnt = 1;
L
Linus Torvalds 已提交
424 425
#endif

426 427
	for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1;
	     cmd->SCp.buffers_residual &&
G
Geert Uytterhoeven 已提交
428
	     virt_to_phys(sg_virt(&cmd->SCp.buffer[1])) == endaddr;) {
F
Finn Thain 已提交
429
		dprintk(NDEBUG_MERGING, "VTOP(%p) == %08lx -> merging\n",
G
Geert Uytterhoeven 已提交
430
			   page_address(sg_page(&cmd->SCp.buffer[1])), endaddr);
L
Linus Torvalds 已提交
431
#if (NDEBUG & NDEBUG_MERGING)
432
		++cnt;
L
Linus Torvalds 已提交
433
#endif
434 435 436 437 438
		++cmd->SCp.buffer;
		--cmd->SCp.buffers_residual;
		cmd->SCp.this_residual += cmd->SCp.buffer->length;
		endaddr += cmd->SCp.buffer->length;
	}
L
Linus Torvalds 已提交
439
#if (NDEBUG & NDEBUG_MERGING)
440
	if (oldlen != cmd->SCp.this_residual)
F
Finn Thain 已提交
441
		dprintk(NDEBUG_MERGING, "merged %d buffers from %p, new length %08x\n",
442
			   cnt, cmd->SCp.ptr, cmd->SCp.this_residual);
L
Linus Torvalds 已提交
443
#endif
444
#endif /* !defined(CONFIG_SUN3) */
L
Linus Torvalds 已提交
445 446
}

F
Finn Thain 已提交
447 448 449
/**
 * initialize_SCp - init the scsi pointer field
 * @cmd: command block to set up
L
Linus Torvalds 已提交
450
 *
F
Finn Thain 已提交
451
 * Set up the internal fields in the SCSI command.
L
Linus Torvalds 已提交
452 453
 */

F
Finn Thain 已提交
454
static inline void initialize_SCp(struct scsi_cmnd *cmd)
L
Linus Torvalds 已提交
455
{
456 457 458
	/*
	 * Initialize the Scsi Pointer field so that all of the commands in the
	 * various queues are valid.
L
Linus Torvalds 已提交
459
	 */
460

461 462 463
	if (scsi_bufflen(cmd)) {
		cmd->SCp.buffer = scsi_sglist(cmd);
		cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
J
Jens Axboe 已提交
464
		cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
465 466 467 468 469 470 471 472
		cmd->SCp.this_residual = cmd->SCp.buffer->length;
		/* ++roman: Try to merge some scatter-buffers if they are at
		 * contiguous physical addresses.
		 */
		merge_contiguous_buffers(cmd);
	} else {
		cmd->SCp.buffer = NULL;
		cmd->SCp.buffers_residual = 0;
473 474
		cmd->SCp.ptr = NULL;
		cmd->SCp.this_residual = 0;
475
	}
L
Linus Torvalds 已提交
476 477 478 479 480 481
}

#include <linux/delay.h>

#if NDEBUG
static struct {
482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502
	unsigned char mask;
	const char *name;
} signals[] = {
	{ SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" },
	{ SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD,  "CD" }, { SR_IO, "IO" },
	{ SR_SEL, "SEL" }, {0, NULL}
}, basrs[] = {
	{BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL}
}, icrs[] = {
	{ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"},
	{ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"},
	{ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"},
	{0, NULL}
}, mrs[] = {
	{MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"},
	{MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR,
	"MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"},
	{MR_MONITOR_BSY, "MODE MONITOR BSY"},
	{MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"},
	{0, NULL}
};
L
Linus Torvalds 已提交
503

F
Finn Thain 已提交
504 505 506
/**
 * NCR5380_print - print scsi bus signals
 * @instance: adapter state to dump
L
Linus Torvalds 已提交
507
 *
F
Finn Thain 已提交
508
 * Print the SCSI bus signals for debugging purposes
L
Linus Torvalds 已提交
509 510
 */

511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539
static void NCR5380_print(struct Scsi_Host *instance)
{
	unsigned char status, data, basr, mr, icr, i;
	unsigned long flags;

	local_irq_save(flags);
	data = NCR5380_read(CURRENT_SCSI_DATA_REG);
	status = NCR5380_read(STATUS_REG);
	mr = NCR5380_read(MODE_REG);
	icr = NCR5380_read(INITIATOR_COMMAND_REG);
	basr = NCR5380_read(BUS_AND_STATUS_REG);
	local_irq_restore(flags);
	printk("STATUS_REG: %02x ", status);
	for (i = 0; signals[i].mask; ++i)
		if (status & signals[i].mask)
			printk(",%s", signals[i].name);
	printk("\nBASR: %02x ", basr);
	for (i = 0; basrs[i].mask; ++i)
		if (basr & basrs[i].mask)
			printk(",%s", basrs[i].name);
	printk("\nICR: %02x ", icr);
	for (i = 0; icrs[i].mask; ++i)
		if (icr & icrs[i].mask)
			printk(",%s", icrs[i].name);
	printk("\nMODE: %02x ", mr);
	for (i = 0; mrs[i].mask; ++i)
		if (mr & mrs[i].mask)
			printk(",%s", mrs[i].name);
	printk("\n");
L
Linus Torvalds 已提交
540 541 542
}

static struct {
543 544
	unsigned char value;
	const char *name;
L
Linus Torvalds 已提交
545
} phases[] = {
546 547 548 549
	{PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"},
	{PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"},
	{PHASE_UNKNOWN, "UNKNOWN"}
};
L
Linus Torvalds 已提交
550

F
Finn Thain 已提交
551 552 553
/**
 * NCR5380_print_phase - show SCSI phase
 * @instance: adapter to dump
L
Linus Torvalds 已提交
554
 *
F
Finn Thain 已提交
555
 * Print the current SCSI phase for debugging purposes
L
Linus Torvalds 已提交
556
 *
F
Finn Thain 已提交
557
 * Locks: none
L
Linus Torvalds 已提交
558 559 560 561
 */

static void NCR5380_print_phase(struct Scsi_Host *instance)
{
562 563 564 565 566 567 568 569 570 571 572 573
	unsigned char status;
	int i;

	status = NCR5380_read(STATUS_REG);
	if (!(status & SR_REQ))
		printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO);
	else {
		for (i = 0; (phases[i].value != PHASE_UNKNOWN) &&
		     (phases[i].value != (status & PHASE_MASK)); ++i)
			;
		printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name);
	}
L
Linus Torvalds 已提交
574 575 576 577 578 579
}

#endif

/*
 * ++roman: New scheme of calling NCR5380_main()
580
 *
L
Linus Torvalds 已提交
581 582 583 584 585 586 587 588 589 590
 * If we're not in an interrupt, we can call our main directly, it cannot be
 * already running. Else, we queue it on a task queue, if not 'main_running'
 * tells us that a lower level is already executing it. This way,
 * 'main_running' needs not be protected in a special way.
 *
 * queue_main() is a utility function for putting our main onto the task
 * queue, if main_running is false. It should be called only from a
 * interrupt or bottom half.
 */

591
#include <linux/gfp.h>
L
Linus Torvalds 已提交
592 593 594
#include <linux/workqueue.h>
#include <linux/interrupt.h>

595
static inline void queue_main(struct NCR5380_hostdata *hostdata)
L
Linus Torvalds 已提交
596
{
597
	if (!hostdata->main_running) {
598 599 600 601
		/* If in interrupt and NCR5380_main() not already running,
		   queue it on the 'immediate' task queue, to be processed
		   immediately after the current interrupt processing has
		   finished. */
602
		schedule_work(&hostdata->main_task);
603 604 605
	}
	/* else: nothing to do: the running NCR5380_main() will pick up
	   any newly queued command. */
L
Linus Torvalds 已提交
606 607
}

F
Finn Thain 已提交
608 609 610
/**
 * NCR58380_info - report driver and host information
 * @instance: relevant scsi host instance
L
Linus Torvalds 已提交
611
 *
F
Finn Thain 已提交
612
 * For use as the host template info() handler.
L
Linus Torvalds 已提交
613
 *
F
Finn Thain 已提交
614
 * Locks: none
L
Linus Torvalds 已提交
615 616
 */

F
Finn Thain 已提交
617
static const char *NCR5380_info(struct Scsi_Host *instance)
L
Linus Torvalds 已提交
618
{
F
Finn Thain 已提交
619 620 621 622 623 624 625 626 627 628 629 630 631 632
	struct NCR5380_hostdata *hostdata = shost_priv(instance);

	return hostdata->info;
}

static void prepare_info(struct Scsi_Host *instance)
{
	struct NCR5380_hostdata *hostdata = shost_priv(instance);

	snprintf(hostdata->info, sizeof(hostdata->info),
	         "%s, io_port 0x%lx, n_io_port %d, "
	         "base 0x%lx, irq %d, "
	         "can_queue %d, cmd_per_lun %d, "
	         "sg_tablesize %d, this_id %d, "
633
	         "flags { %s}, "
F
Finn Thain 已提交
634 635 636 637 638
	         "options { %s} ",
	         instance->hostt->name, instance->io_port, instance->n_io_port,
	         instance->base, instance->irq,
	         instance->can_queue, instance->cmd_per_lun,
	         instance->sg_tablesize, instance->this_id,
639
	         hostdata->flags & FLAG_TAGGED_QUEUING ? "TAGGED_QUEUING " : "",
F
Finn Thain 已提交
640 641 642
#ifdef DIFFERENTIAL
	         "DIFFERENTIAL "
#endif
L
Linus Torvalds 已提交
643
#ifdef REAL_DMA
F
Finn Thain 已提交
644
	         "REAL_DMA "
L
Linus Torvalds 已提交
645 646
#endif
#ifdef PARITY
F
Finn Thain 已提交
647
	         "PARITY "
L
Linus Torvalds 已提交
648 649
#endif
#ifdef SUPPORT_TAGS
F
Finn Thain 已提交
650
	         "SUPPORT_TAGS "
L
Linus Torvalds 已提交
651
#endif
F
Finn Thain 已提交
652
	         "");
L
Linus Torvalds 已提交
653 654
}

F
Finn Thain 已提交
655 656 657
/**
 * NCR5380_print_status - dump controller info
 * @instance: controller to dump
L
Linus Torvalds 已提交
658
 *
F
Finn Thain 已提交
659 660
 * Print commands in the various queues, called from NCR5380_abort
 * to aid debugging.
L
Linus Torvalds 已提交
661 662
 */

F
Finn Thain 已提交
663
static void lprint_Scsi_Cmnd(struct scsi_cmnd *cmd)
L
Linus Torvalds 已提交
664
{
A
Al Viro 已提交
665 666
	int i, s;
	unsigned char *command;
H
Hannes Reinecke 已提交
667
	printk("scsi%d: destination target %d, lun %llu\n",
A
Al Viro 已提交
668 669 670 671 672 673 674
		H_NO(cmd), cmd->device->id, cmd->device->lun);
	printk(KERN_CONT "        command = ");
	command = cmd->cmnd;
	printk(KERN_CONT "%2d (0x%02x)", command[0], command[0]);
	for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
		printk(KERN_CONT " %02x", command[i]);
	printk("\n");
L
Linus Torvalds 已提交
675 676
}

A
Al Viro 已提交
677
static void NCR5380_print_status(struct Scsi_Host *instance)
L
Linus Torvalds 已提交
678
{
679
	struct NCR5380_hostdata *hostdata;
F
Finn Thain 已提交
680
	struct scsi_cmnd *ptr;
681
	unsigned long flags;
A
Al Viro 已提交
682

683 684
	NCR5380_dprint(NDEBUG_ANY, instance);
	NCR5380_dprint_phase(NDEBUG_ANY, instance);
685 686 687 688

	hostdata = (struct NCR5380_hostdata *)instance->hostdata;

	local_irq_save(flags);
A
Al Viro 已提交
689
	printk("NCR5380: coroutine is%s running.\n",
690
		hostdata->main_running ? "" : "n't");
691
	if (!hostdata->connected)
A
Al Viro 已提交
692
		printk("scsi%d: no currently connected command\n", HOSTNO);
693
	else
F
Finn Thain 已提交
694
		lprint_Scsi_Cmnd((struct scsi_cmnd *) hostdata->connected);
A
Al Viro 已提交
695
	printk("scsi%d: issue_queue\n", HOSTNO);
F
Finn Thain 已提交
696
	for (ptr = (struct scsi_cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr))
A
Al Viro 已提交
697
		lprint_Scsi_Cmnd(ptr);
L
Linus Torvalds 已提交
698

A
Al Viro 已提交
699
	printk("scsi%d: disconnected_queue\n", HOSTNO);
F
Finn Thain 已提交
700
	for (ptr = (struct scsi_cmnd *) hostdata->disconnected_queue; ptr;
A
Al Viro 已提交
701 702
	     ptr = NEXT(ptr))
		lprint_Scsi_Cmnd(ptr);
L
Linus Torvalds 已提交
703

704
	local_irq_restore(flags);
A
Al Viro 已提交
705
	printk("\n");
L
Linus Torvalds 已提交
706 707
}

F
Finn Thain 已提交
708
static void show_Scsi_Cmnd(struct scsi_cmnd *cmd, struct seq_file *m)
L
Linus Torvalds 已提交
709
{
710 711
	int i, s;
	unsigned char *command;
H
Hannes Reinecke 已提交
712
	seq_printf(m, "scsi%d: destination target %d, lun %llu\n",
713
		H_NO(cmd), cmd->device->id, cmd->device->lun);
A
Al Viro 已提交
714
	seq_printf(m, "        command = ");
715
	command = cmd->cmnd;
A
Al Viro 已提交
716
	seq_printf(m, "%2d (0x%02x)", command[0], command[0]);
717
	for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
A
Al Viro 已提交
718 719
		seq_printf(m, " %02x", command[i]);
	seq_printf(m, "\n");
L
Linus Torvalds 已提交
720 721
}

722 723
static int __maybe_unused NCR5380_show_info(struct seq_file *m,
                                            struct Scsi_Host *instance)
A
Al Viro 已提交
724 725
{
	struct NCR5380_hostdata *hostdata;
F
Finn Thain 已提交
726
	struct scsi_cmnd *ptr;
A
Al Viro 已提交
727 728 729 730 731 732
	unsigned long flags;

	hostdata = (struct NCR5380_hostdata *)instance->hostdata;

	local_irq_save(flags);
	seq_printf(m, "NCR5380: coroutine is%s running.\n",
733
		hostdata->main_running ? "" : "n't");
A
Al Viro 已提交
734 735 736
	if (!hostdata->connected)
		seq_printf(m, "scsi%d: no currently connected command\n", HOSTNO);
	else
F
Finn Thain 已提交
737
		show_Scsi_Cmnd((struct scsi_cmnd *) hostdata->connected, m);
A
Al Viro 已提交
738
	seq_printf(m, "scsi%d: issue_queue\n", HOSTNO);
F
Finn Thain 已提交
739
	for (ptr = (struct scsi_cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr))
A
Al Viro 已提交
740 741 742
		show_Scsi_Cmnd(ptr, m);

	seq_printf(m, "scsi%d: disconnected_queue\n", HOSTNO);
F
Finn Thain 已提交
743
	for (ptr = (struct scsi_cmnd *) hostdata->disconnected_queue; ptr;
A
Al Viro 已提交
744 745 746 747 748 749
	     ptr = NEXT(ptr))
		show_Scsi_Cmnd(ptr, m);

	local_irq_restore(flags);
	return 0;
}
L
Linus Torvalds 已提交
750

F
Finn Thain 已提交
751 752 753 754
/**
 * NCR5380_init - initialise an NCR5380
 * @instance: adapter to configure
 * @flags: control flags
L
Linus Torvalds 已提交
755
 *
F
Finn Thain 已提交
756 757
 * Initializes *instance and corresponding 5380 chip,
 * with flags OR'd into the initial flags value.
L
Linus Torvalds 已提交
758 759
 *
 * Notes : I assume that the host, hostno, and id bits have been
F
Finn Thain 已提交
760
 * set correctly. I don't care about the irq and other fields.
761
 *
F
Finn Thain 已提交
762
 * Returns 0 for success
L
Linus Torvalds 已提交
763 764
 */

765
static int __init NCR5380_init(struct Scsi_Host *instance, int flags)
L
Linus Torvalds 已提交
766
{
767 768 769
	int i;
	SETUP_HOSTDATA(instance);

770
	hostdata->host = instance;
771 772 773 774 775 776 777 778
	hostdata->aborted = 0;
	hostdata->id_mask = 1 << instance->this_id;
	hostdata->id_higher_mask = 0;
	for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
		if (i > hostdata->id_mask)
			hostdata->id_higher_mask |= i;
	for (i = 0; i < 8; ++i)
		hostdata->busy[i] = 0;
L
Linus Torvalds 已提交
779
#ifdef SUPPORT_TAGS
780
	init_tags(hostdata);
L
Linus Torvalds 已提交
781 782
#endif
#if defined (REAL_DMA)
783
	hostdata->dma_len = 0;
L
Linus Torvalds 已提交
784
#endif
785 786 787 788
	hostdata->targets_present = 0;
	hostdata->connected = NULL;
	hostdata->issue_queue = NULL;
	hostdata->disconnected_queue = NULL;
789
	hostdata->flags = flags;
790

791
	INIT_WORK(&hostdata->main_task, NCR5380_main);
L
Linus Torvalds 已提交
792

F
Finn Thain 已提交
793 794
	prepare_info(instance);

795 796 797 798
	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
	NCR5380_write(MODE_REG, MR_BASE);
	NCR5380_write(TARGET_COMMAND_REG, 0);
	NCR5380_write(SELECT_ENABLE_REG, 0);
L
Linus Torvalds 已提交
799

800
	return 0;
L
Linus Torvalds 已提交
801 802
}

F
Finn Thain 已提交
803 804 805 806 807 808 809
/**
 * NCR5380_exit - remove an NCR5380
 * @instance: adapter to remove
 *
 * Assumes that no more work can be queued (e.g. by NCR5380_intr).
 */

810 811
static void NCR5380_exit(struct Scsi_Host *instance)
{
812 813 814
	struct NCR5380_hostdata *hostdata = shost_priv(instance);

	cancel_work_sync(&hostdata->main_task);
815 816
}

F
Finn Thain 已提交
817 818 819 820
/**
 * NCR5380_queue_command - queue a command
 * @instance: the relevant SCSI adapter
 * @cmd: SCSI command
L
Linus Torvalds 已提交
821
 *
F
Finn Thain 已提交
822 823 824
 * cmd is added to the per instance issue_queue, with minor
 * twiddling done to the host specific fields of cmd.  If the
 * main coroutine is not running, it is restarted.
L
Linus Torvalds 已提交
825 826
 */

827 828
static int NCR5380_queue_command(struct Scsi_Host *instance,
                                 struct scsi_cmnd *cmd)
L
Linus Torvalds 已提交
829
{
830
	struct NCR5380_hostdata *hostdata = shost_priv(instance);
F
Finn Thain 已提交
831
	struct scsi_cmnd *tmp;
832
	unsigned long flags;
L
Linus Torvalds 已提交
833 834

#if (NDEBUG & NDEBUG_NO_WRITE)
835 836 837 838 839 840
	switch (cmd->cmnd[0]) {
	case WRITE_6:
	case WRITE_10:
		printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
		       H_NO(cmd));
		cmd->result = (DID_ERROR << 16);
841
		cmd->scsi_done(cmd);
842 843
		return 0;
	}
L
Linus Torvalds 已提交
844 845
#endif /* (NDEBUG & NDEBUG_NO_WRITE) */

846 847 848 849 850
	/*
	 * We use the host_scribble field as a pointer to the next command
	 * in a queue
	 */

851
	SET_NEXT(cmd, NULL);
852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872
	cmd->result = 0;

	/*
	 * Insert the cmd into the issue queue. Note that REQUEST SENSE
	 * commands are added to the head of the queue since any command will
	 * clear the contingent allegiance condition that exists and the
	 * sense data is only guaranteed to be valid while the condition exists.
	 */

	/* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
	 * Otherwise a running NCR5380_main may steal the lock.
	 * Lock before actually inserting due to fairness reasons explained in
	 * atari_scsi.c. If we insert first, then it's impossible for this driver
	 * to release the lock.
	 * Stop timer for this command while waiting for the lock, or timeouts
	 * may happen (and they really do), and it's no good if the command doesn't
	 * appear in any of the queues.
	 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
	 * because also a timer int can trigger an abort or reset, which would
	 * alter queues and touch the lock.
	 */
873
	if (!NCR5380_acquire_dma_irq(instance))
874 875 876 877
		return SCSI_MLQUEUE_HOST_BUSY;

	local_irq_save(flags);

F
Finn Thain 已提交
878 879 880 881 882 883 884
	/*
	 * Insert the cmd into the issue queue. Note that REQUEST SENSE
	 * commands are added to the head of the queue since any command will
	 * clear the contingent allegiance condition that exists and the
	 * sense data is only guaranteed to be valid while the condition exists.
	 */

885 886
	if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
		LIST(cmd, hostdata->issue_queue);
887
		SET_NEXT(cmd, hostdata->issue_queue);
888 889
		hostdata->issue_queue = cmd;
	} else {
F
Finn Thain 已提交
890
		for (tmp = (struct scsi_cmnd *)hostdata->issue_queue;
891 892 893
		     NEXT(tmp); tmp = NEXT(tmp))
			;
		LIST(cmd, tmp);
894
		SET_NEXT(tmp, cmd);
895 896 897
	}
	local_irq_restore(flags);

F
Finn Thain 已提交
898
	dprintk(NDEBUG_QUEUES, "scsi%d: command added to %s of queue\n", H_NO(cmd),
899 900 901 902 903 904 905 906 907
		  (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");

	/* If queue_command() is called from an interrupt (real one or bottom
	 * half), we let queue_main() do the job of taking care about main. If it
	 * is already running, this is a no-op, else main will be queued.
	 *
	 * If we're not in an interrupt, we can call NCR5380_main()
	 * unconditionally, because it cannot be already running.
	 */
908
	if (in_interrupt() || irqs_disabled())
909
		queue_main(hostdata);
910
	else
911
		NCR5380_main(&hostdata->main_task);
912
	return 0;
L
Linus Torvalds 已提交
913 914
}

915 916 917 918 919 920 921 922 923 924 925 926
static inline void maybe_release_dma_irq(struct Scsi_Host *instance)
{
	struct NCR5380_hostdata *hostdata = shost_priv(instance);

	/* Caller does the locking needed to set & test these data atomically */
	if (!hostdata->disconnected_queue &&
	    !hostdata->issue_queue &&
	    !hostdata->connected &&
	    !hostdata->retain_dma_intr)
		NCR5380_release_dma_irq(instance);
}

F
Finn Thain 已提交
927 928
/**
 * NCR5380_main - NCR state machines
L
Linus Torvalds 已提交
929
 *
F
Finn Thain 已提交
930 931 932 933
 * NCR5380_main is a coroutine that runs as long as more work can
 * be done on the NCR5380 host adapters in a system.  Both
 * NCR5380_queue_command() and NCR5380_intr() will try to start it
 * in case it is not running.
934
 *
F
Finn Thain 已提交
935
 * Locks: called as its own thread with no locks held.
936 937
 */

938
static void NCR5380_main(struct work_struct *work)
L
Linus Torvalds 已提交
939
{
940 941 942
	struct NCR5380_hostdata *hostdata =
		container_of(work, struct NCR5380_hostdata, main_task);
	struct Scsi_Host *instance = hostdata->host;
F
Finn Thain 已提交
943
	struct scsi_cmnd *tmp, *prev;
944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967
	int done;
	unsigned long flags;

	/*
	 * We run (with interrupts disabled) until we're sure that none of
	 * the host adapters have anything that can be done, at which point
	 * we set main_running to 0 and exit.
	 *
	 * Interrupts are enabled before doing various other internal
	 * instructions, after we've decided that we need to run through
	 * the loop again.
	 *
	 * this should prevent any race conditions.
	 *
	 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
	 * because also a timer int can trigger an abort or reset, which can
	 * alter queues and touch the Falcon lock.
	 */

	/* Tell int handlers main() is now already executing.  Note that
	   no races are possible here. If an int comes in before
	   'main_running' is set here, and queues/executes main via the
	   task queue, it doesn't do any harm, just this instance of main
	   won't find any work left to do. */
968
	if (hostdata->main_running)
969
		return;
970
	hostdata->main_running = 1;
971 972 973 974 975 976 977

	local_save_flags(flags);
	do {
		local_irq_disable();	/* Freeze request queues */
		done = 1;

		if (!hostdata->connected) {
F
Finn Thain 已提交
978
			dprintk(NDEBUG_MAIN, "scsi%d: not connected\n", HOSTNO);
979 980 981 982
			/*
			 * Search through the issue_queue for a command destined
			 * for a target that's not busy.
			 */
L
Linus Torvalds 已提交
983
#if (NDEBUG & NDEBUG_LISTS)
F
Finn Thain 已提交
984
			for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, prev = NULL;
985 986 987 988 989 990
			     tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp))
				;
			/*printk("%p  ", tmp);*/
			if ((tmp == prev) && tmp)
				printk(" LOOP\n");
			/* else printk("\n"); */
L
Linus Torvalds 已提交
991
#endif
F
Finn Thain 已提交
992
			for (tmp = (struct scsi_cmnd *) hostdata->issue_queue,
993
			     prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp)) {
H
Hannes Reinecke 已提交
994
				u8 lun = tmp->device->lun;
L
Linus Torvalds 已提交
995

996 997 998 999
				dprintk(NDEBUG_LISTS,
				        "MAIN tmp=%p target=%d busy=%d lun=%d\n",
				        tmp, scmd_id(tmp), hostdata->busy[scmd_id(tmp)],
				        lun);
1000 1001 1002
				/*  When we find one, remove it from the issue queue. */
				/* ++guenther: possible race with Falcon locking */
				if (
L
Linus Torvalds 已提交
1003
#ifdef SUPPORT_TAGS
1004
				    !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE)
L
Linus Torvalds 已提交
1005
#else
H
Hannes Reinecke 已提交
1006
				    !(hostdata->busy[tmp->device->id] & (1 << lun))
L
Linus Torvalds 已提交
1007
#endif
1008 1009 1010 1011 1012
				    ) {
					/* ++guenther: just to be sure, this must be atomic */
					local_irq_disable();
					if (prev) {
						REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
1013
						SET_NEXT(prev, NEXT(tmp));
1014 1015 1016 1017
					} else {
						REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp));
						hostdata->issue_queue = NEXT(tmp);
					}
1018
					SET_NEXT(tmp, NULL);
1019
					hostdata->retain_dma_intr++;
1020 1021 1022 1023 1024 1025 1026 1027 1028 1029

					/* reenable interrupts after finding one */
					local_irq_restore(flags);

					/*
					 * Attempt to establish an I_T_L nexus here.
					 * On success, instance->hostdata->connected is set.
					 * On failure, we must add the command back to the
					 *   issue queue so we can keep trying.
					 */
F
Finn Thain 已提交
1030
					dprintk(NDEBUG_MAIN, "scsi%d: main(): command for target %d "
1031
						    "lun %d removed from issue_queue\n",
H
Hannes Reinecke 已提交
1032
						    HOSTNO, tmp->device->id, lun);
1033 1034 1035 1036 1037 1038 1039 1040 1041 1042
					/*
					 * REQUEST SENSE commands are issued without tagged
					 * queueing, even on SCSI-II devices because the
					 * contingent allegiance condition exists for the
					 * entire unit.
					 */
					/* ++roman: ...and the standard also requires that
					 * REQUEST SENSE command are untagged.
					 */

L
Linus Torvalds 已提交
1043
#ifdef SUPPORT_TAGS
1044
					cmd_get_tag(tmp, tmp->cmnd[0] != REQUEST_SENSE);
L
Linus Torvalds 已提交
1045
#endif
1046
					if (!NCR5380_select(instance, tmp)) {
1047
						local_irq_disable();
1048
						hostdata->retain_dma_intr--;
1049
						/* release if target did not response! */
1050 1051
						maybe_release_dma_irq(instance);
						local_irq_restore(flags);
1052 1053 1054 1055
						break;
					} else {
						local_irq_disable();
						LIST(tmp, hostdata->issue_queue);
1056
						SET_NEXT(tmp, hostdata->issue_queue);
1057
						hostdata->issue_queue = tmp;
L
Linus Torvalds 已提交
1058
#ifdef SUPPORT_TAGS
1059
						cmd_free_tag(tmp);
L
Linus Torvalds 已提交
1060
#endif
1061
						hostdata->retain_dma_intr--;
1062
						local_irq_restore(flags);
F
Finn Thain 已提交
1063
						dprintk(NDEBUG_MAIN, "scsi%d: main(): select() failed, "
1064 1065 1066 1067 1068 1069 1070 1071 1072
							    "returned to issue_queue\n", HOSTNO);
						if (hostdata->connected)
							break;
					}
				} /* if target/lun/target queue is not busy */
			} /* for issue_queue */
		} /* if (!hostdata->connected) */

		if (hostdata->connected
L
Linus Torvalds 已提交
1073
#ifdef REAL_DMA
1074
		    && !hostdata->dma_len
L
Linus Torvalds 已提交
1075
#endif
1076 1077
		    ) {
			local_irq_restore(flags);
F
Finn Thain 已提交
1078
			dprintk(NDEBUG_MAIN, "scsi%d: main: performing information transfer\n",
1079 1080
				    HOSTNO);
			NCR5380_information_transfer(instance);
F
Finn Thain 已提交
1081
			dprintk(NDEBUG_MAIN, "scsi%d: main: done set false\n", HOSTNO);
1082 1083 1084
			done = 0;
		}
	} while (!done);
L
Linus Torvalds 已提交
1085

1086 1087 1088
	/* Better allow ints _after_ 'main_running' has been cleared, else
	   an interrupt could believe we'll pick up the work it left for
	   us, but we won't see it anymore here... */
1089
	hostdata->main_running = 0;
1090
	local_irq_restore(flags);
L
Linus Torvalds 已提交
1091 1092 1093 1094 1095 1096 1097 1098
}


#ifdef REAL_DMA
/*
 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
 *
 * Purpose : Called by interrupt handler when DMA finishes or a phase
1099
 *	mismatch occurs (which would finish the DMA transfer).
L
Linus Torvalds 已提交
1100 1101 1102 1103 1104
 *
 * Inputs : instance - this instance of the NCR5380.
 *
 */

1105
static void NCR5380_dma_complete(struct Scsi_Host *instance)
L
Linus Torvalds 已提交
1106
{
1107
	SETUP_HOSTDATA(instance);
F
Finn Thain 已提交
1108
	int transferred;
1109
	unsigned char **data;
1110
	volatile int *count;
1111 1112
	int saved_data = 0, overrun = 0;
	unsigned char p;
1113 1114 1115 1116 1117

	if (!hostdata->connected) {
		printk(KERN_WARNING "scsi%d: received end of DMA interrupt with "
		       "no connected cmd\n", HOSTNO);
		return;
L
Linus Torvalds 已提交
1118
	}
1119

1120
	if (hostdata->read_overruns) {
1121 1122 1123 1124 1125 1126 1127 1128
		p = hostdata->connected->SCp.phase;
		if (p & SR_IO) {
			udelay(10);
			if ((NCR5380_read(BUS_AND_STATUS_REG) &
			     (BASR_PHASE_MATCH|BASR_ACK)) ==
			    (BASR_PHASE_MATCH|BASR_ACK)) {
				saved_data = NCR5380_read(INPUT_DATA_REG);
				overrun = 1;
F
Finn Thain 已提交
1129
				dprintk(NDEBUG_DMA, "scsi%d: read overrun handled\n", HOSTNO);
1130 1131 1132 1133
			}
		}
	}

F
Finn Thain 已提交
1134
	dprintk(NDEBUG_DMA, "scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n",
1135 1136 1137
		   HOSTNO, NCR5380_read(BUS_AND_STATUS_REG),
		   NCR5380_read(STATUS_REG));

1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155
#if defined(CONFIG_SUN3)
	if ((sun3scsi_dma_finish(rq_data_dir(hostdata->connected->request)))) {
		pr_err("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n",
		       instance->host_no);
		BUG();
	}

	/* make sure we're not stuck in a data phase */
	if ((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) ==
	    (BASR_PHASE_MATCH | BASR_ACK)) {
		pr_err("scsi%d: BASR %02x\n", instance->host_no,
		       NCR5380_read(BUS_AND_STATUS_REG));
		pr_err("scsi%d: bus stuck in data phase -- probably a single byte overrun!\n",
		       instance->host_no);
		BUG();
	}
#endif

1156 1157 1158 1159
	(void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
	NCR5380_write(MODE_REG, MR_BASE);
	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);

F
Finn Thain 已提交
1160
	transferred = hostdata->dma_len - NCR5380_dma_residual(instance);
1161 1162 1163 1164
	hostdata->dma_len = 0;

	data = (unsigned char **)&hostdata->connected->SCp.ptr;
	count = &hostdata->connected->SCp.this_residual;
F
Finn Thain 已提交
1165 1166
	*data += transferred;
	*count -= transferred;
1167

1168
	if (hostdata->read_overruns) {
1169 1170
		int cnt, toPIO;

1171
		if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) {
1172
			cnt = toPIO = hostdata->read_overruns;
1173
			if (overrun) {
F
Finn Thain 已提交
1174
				dprintk(NDEBUG_DMA, "Got an input overrun, using saved byte\n");
1175 1176 1177 1178 1179
				*(*data)++ = saved_data;
				(*count)--;
				cnt--;
				toPIO--;
			}
F
Finn Thain 已提交
1180
			dprintk(NDEBUG_DMA, "Doing %d-byte PIO to 0x%08lx\n", cnt, (long)*data);
1181 1182 1183
			NCR5380_transfer_pio(instance, &p, &cnt, data);
			*count -= toPIO - cnt;
		}
L
Linus Torvalds 已提交
1184 1185 1186 1187 1188
	}
}
#endif /* REAL_DMA */


F
Finn Thain 已提交
1189 1190 1191 1192
/**
 * NCR5380_intr - generic NCR5380 irq handler
 * @irq: interrupt number
 * @dev_id: device info
L
Linus Torvalds 已提交
1193
 *
F
Finn Thain 已提交
1194 1195 1196
 * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
 * from the disconnected queue, and restarting NCR5380_main()
 * as required.
L
Linus Torvalds 已提交
1197 1198
 */

1199
static irqreturn_t NCR5380_intr(int irq, void *dev_id)
L
Linus Torvalds 已提交
1200
{
1201
	struct Scsi_Host *instance = dev_id;
1202 1203 1204
	int done = 1, handled = 0;
	unsigned char basr;

F
Finn Thain 已提交
1205
	dprintk(NDEBUG_INTR, "scsi%d: NCR5380 irq triggered\n", HOSTNO);
1206 1207 1208

	/* Look for pending interrupts */
	basr = NCR5380_read(BUS_AND_STATUS_REG);
F
Finn Thain 已提交
1209
	dprintk(NDEBUG_INTR, "scsi%d: BASR=%02x\n", HOSTNO, basr);
1210 1211
	/* dispatch to appropriate routine if found and done=0 */
	if (basr & BASR_IRQ) {
1212
		NCR5380_dprint(NDEBUG_INTR, instance);
1213 1214
		if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) {
			done = 0;
F
Finn Thain 已提交
1215
			dprintk(NDEBUG_INTR, "scsi%d: SEL interrupt\n", HOSTNO);
1216 1217 1218
			NCR5380_reselect(instance);
			(void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
		} else if (basr & BASR_PARITY_ERROR) {
F
Finn Thain 已提交
1219
			dprintk(NDEBUG_INTR, "scsi%d: PARITY interrupt\n", HOSTNO);
1220 1221
			(void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
		} else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
F
Finn Thain 已提交
1222
			dprintk(NDEBUG_INTR, "scsi%d: RESET interrupt\n", HOSTNO);
1223 1224 1225 1226 1227 1228
			(void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
		} else {
			/*
			 * The rest of the interrupt conditions can occur only during a
			 * DMA transfer
			 */
L
Linus Torvalds 已提交
1229 1230

#if defined(REAL_DMA)
1231 1232 1233 1234 1235 1236 1237 1238 1239 1240
			/*
			 * We should only get PHASE MISMATCH and EOP interrupts if we have
			 * DMA enabled, so do a sanity check based on the current setting
			 * of the MODE register.
			 */

			if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) &&
			    ((basr & BASR_END_DMA_TRANSFER) ||
			     !(basr & BASR_PHASE_MATCH))) {

F
Finn Thain 已提交
1241
				dprintk(NDEBUG_INTR, "scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO);
1242 1243 1244
				NCR5380_dma_complete( instance );
				done = 0;
			} else
L
Linus Torvalds 已提交
1245
#endif /* REAL_DMA */
1246
			{
L
Linus Torvalds 已提交
1247
/* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */
1248
				if (basr & BASR_PHASE_MATCH)
1249
					dprintk(NDEBUG_INTR, "scsi%d: unknown interrupt, "
1250 1251 1252 1253
					       "BASR 0x%x, MR 0x%x, SR 0x%x\n",
					       HOSTNO, basr, NCR5380_read(MODE_REG),
					       NCR5380_read(STATUS_REG));
				(void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1254 1255 1256
#ifdef SUN3_SCSI_VME
				dregs->csr |= CSR_DMA_ENABLE;
#endif
1257 1258 1259 1260 1261 1262 1263 1264
			}
		} /* if !(SELECTION || PARITY) */
		handled = 1;
	} /* BASR & IRQ */ else {
		printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, "
		       "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr,
		       NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG));
		(void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1265 1266 1267
#ifdef SUN3_SCSI_VME
		dregs->csr |= CSR_DMA_ENABLE;
#endif
1268 1269 1270
	}

	if (!done) {
F
Finn Thain 已提交
1271
		dprintk(NDEBUG_INTR, "scsi%d: in int routine, calling main\n", HOSTNO);
1272
		/* Put a call to NCR5380_main() on the queue... */
1273
		queue_main(shost_priv(instance));
1274 1275
	}
	return IRQ_RETVAL(handled);
L
Linus Torvalds 已提交
1276 1277
}

1278
/*
F
Finn Thain 已提交
1279 1280
 * Function : int NCR5380_select(struct Scsi_Host *instance,
 *                               struct scsi_cmnd *cmd)
L
Linus Torvalds 已提交
1281 1282
 *
 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1283 1284
 *	including ARBITRATION, SELECTION, and initial message out for
 *	IDENTIFY and queue messages.
L
Linus Torvalds 已提交
1285
 *
1286
 * Inputs : instance - instantiation of the 5380 driver on which this
1287
 *	target lives, cmd - SCSI command to execute.
1288
 *
L
Linus Torvalds 已提交
1289
 * Returns : -1 if selection could not execute for some reason,
1290 1291
 *	0 if selection succeeded or failed because the target
 *	did not respond.
L
Linus Torvalds 已提交
1292
 *
1293 1294
 * Side effects :
 *	If bus busy, arbitration failed, etc, NCR5380_select() will exit
L
Linus Torvalds 已提交
1295 1296 1297 1298
 *		with registers as they should have been on entry - ie
 *		SELECT_ENABLE will be set appropriately, the NCR5380
 *		will cease to drive any SCSI bus signals.
 *
1299 1300 1301
 *	If successful : I_T_L or I_T_L_Q nexus will be established,
 *		instance->connected will be set to cmd.
 *		SELECT interrupt will be disabled.
L
Linus Torvalds 已提交
1302
 *
1303
 *	If failed (no target) : cmd->scsi_done() will be called, and the
L
Linus Torvalds 已提交
1304 1305 1306
 *		cmd->result host byte set to DID_BAD_TARGET.
 */

F
Finn Thain 已提交
1307
static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd)
L
Linus Torvalds 已提交
1308
{
1309 1310 1311 1312 1313 1314 1315 1316
	SETUP_HOSTDATA(instance);
	unsigned char tmp[3], phase;
	unsigned char *data;
	int len;
	unsigned long timeout;
	unsigned long flags;

	hostdata->restart_select = 0;
1317
	NCR5380_dprint(NDEBUG_ARBITRATION, instance);
F
Finn Thain 已提交
1318
	dprintk(NDEBUG_ARBITRATION, "scsi%d: starting arbitration, id = %d\n", HOSTNO,
1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331
		   instance->this_id);

	/*
	 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
	 * data bus during SELECTION.
	 */

	local_irq_save(flags);
	if (hostdata->connected) {
		local_irq_restore(flags);
		return -1;
	}
	NCR5380_write(TARGET_COMMAND_REG, 0);
L
Linus Torvalds 已提交
1332

1333 1334 1335
	/*
	 * Start arbitration.
	 */
L
Linus Torvalds 已提交
1336

1337 1338
	NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
	NCR5380_write(MODE_REG, MR_ARBITRATE);
L
Linus Torvalds 已提交
1339

1340
	local_irq_restore(flags);
L
Linus Torvalds 已提交
1341

1342
	/* Wait for arbitration logic to complete */
M
Michael Schmitz 已提交
1343
#if defined(NCR_TIMEOUT)
1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356
	{
		unsigned long timeout = jiffies + 2*NCR_TIMEOUT;

		while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) &&
		       time_before(jiffies, timeout) && !hostdata->connected)
			;
		if (time_after_eq(jiffies, timeout)) {
			printk("scsi : arbitration timeout at %d\n", __LINE__);
			NCR5380_write(MODE_REG, MR_BASE);
			NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
			return -1;
		}
	}
L
Linus Torvalds 已提交
1357
#else /* NCR_TIMEOUT */
1358 1359 1360
	while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) &&
	       !hostdata->connected)
		;
L
Linus Torvalds 已提交
1361 1362
#endif

F
Finn Thain 已提交
1363
	dprintk(NDEBUG_ARBITRATION, "scsi%d: arbitration complete\n", HOSTNO);
1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383

	if (hostdata->connected) {
		NCR5380_write(MODE_REG, MR_BASE);
		return -1;
	}
	/*
	 * The arbitration delay is 2.2us, but this is a minimum and there is
	 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
	 * the integral nature of udelay().
	 *
	 */

	udelay(3);

	/* Check for lost arbitration */
	if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
	    (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) ||
	    (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
	    hostdata->connected) {
		NCR5380_write(MODE_REG, MR_BASE);
F
Finn Thain 已提交
1384
		dprintk(NDEBUG_ARBITRATION, "scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
1385 1386 1387
			   HOSTNO);
		return -1;
	}
L
Linus Torvalds 已提交
1388

1389 1390 1391 1392 1393 1394 1395 1396 1397 1398
	/* after/during arbitration, BSY should be asserted.
	   IBM DPES-31080 Version S31Q works now */
	/* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */
	NCR5380_write(INITIATOR_COMMAND_REG,
		      ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY);

	if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
	    hostdata->connected) {
		NCR5380_write(MODE_REG, MR_BASE);
		NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
F
Finn Thain 已提交
1399
		dprintk(NDEBUG_ARBITRATION, "scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n",
1400 1401 1402 1403 1404 1405 1406 1407
			   HOSTNO);
		return -1;
	}

	/*
	 * Again, bus clear + bus settle time is 1.2us, however, this is
	 * a minimum so we'll udelay ceil(1.2)
	 */
L
Linus Torvalds 已提交
1408 1409

#ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
1410 1411
	/* ++roman: But some targets (see above :-) seem to need a bit more... */
	udelay(15);
L
Linus Torvalds 已提交
1412
#else
1413
	udelay(2);
L
Linus Torvalds 已提交
1414
#endif
1415 1416 1417 1418 1419 1420 1421

	if (hostdata->connected) {
		NCR5380_write(MODE_REG, MR_BASE);
		NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
		return -1;
	}

F
Finn Thain 已提交
1422
	dprintk(NDEBUG_ARBITRATION, "scsi%d: won arbitration\n", HOSTNO);
1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438

	/*
	 * Now that we have won arbitration, start Selection process, asserting
	 * the host and target ID's on the SCSI bus.
	 */

	NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id)));

	/*
	 * Raise ATN while SEL is true before BSY goes false from arbitration,
	 * since this is the only way to guarantee that we'll get a MESSAGE OUT
	 * phase immediately after selection.
	 */

	NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY |
		      ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL ));
L
Linus Torvalds 已提交
1439 1440
	NCR5380_write(MODE_REG, MR_BASE);

1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451
	/*
	 * Reselect interrupts must be turned off prior to the dropping of BSY,
	 * otherwise we will trigger an interrupt.
	 */

	if (hostdata->connected) {
		NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
		return -1;
	}

	NCR5380_write(SELECT_ENABLE_REG, 0);
L
Linus Torvalds 已提交
1452

1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478
	/*
	 * The initiator shall then wait at least two deskew delays and release
	 * the BSY signal.
	 */
	udelay(1);        /* wingel -- wait two bus deskew delay >2*45ns */

	/* Reset BSY */
	NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA |
		      ICR_ASSERT_ATN | ICR_ASSERT_SEL));

	/*
	 * Something weird happens when we cease to drive BSY - looks
	 * like the board/chip is letting us do another read before the
	 * appropriate propagation delay has expired, and we're confusing
	 * a BSY signal from ourselves as the target's response to SELECTION.
	 *
	 * A small delay (the 'C++' frontend breaks the pipeline with an
	 * unnecessary jump, making it work on my 386-33/Trantor T128, the
	 * tighter 'C' code breaks and requires this) solves the problem -
	 * the 1 us delay is arbitrary, and only used because this delay will
	 * be the same on other platforms and since it works here, it should
	 * work there.
	 *
	 * wingel suggests that this could be due to failing to wait
	 * one deskew delay.
	 */
L
Linus Torvalds 已提交
1479

1480
	udelay(1);
L
Linus Torvalds 已提交
1481

F
Finn Thain 已提交
1482
	dprintk(NDEBUG_SELECTION, "scsi%d: selecting target %d\n", HOSTNO, cmd->device->id);
L
Linus Torvalds 已提交
1483

1484 1485 1486 1487
	/*
	 * The SCSI specification calls for a 250 ms timeout for the actual
	 * selection.
	 */
L
Linus Torvalds 已提交
1488

F
Finn Thain 已提交
1489
	timeout = jiffies + (250 * HZ / 1000);
L
Linus Torvalds 已提交
1490

1491 1492 1493 1494 1495
	/*
	 * XXX very interesting - we're seeing a bounce where the BSY we
	 * asserted is being reflected / still asserted (propagation delay?)
	 * and it's detecting as true.  Sigh.
	 */
L
Linus Torvalds 已提交
1496 1497

#if 0
1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516
	/* ++roman: If a target conformed to the SCSI standard, it wouldn't assert
	 * IO while SEL is true. But again, there are some disks out the in the
	 * world that do that nevertheless. (Somebody claimed that this announces
	 * reselection capability of the target.) So we better skip that test and
	 * only wait for BSY... (Famous german words: Der Klügere gibt nach :-)
	 */

	while (time_before(jiffies, timeout) &&
	       !(NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO)))
		;

	if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
		NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
		NCR5380_reselect(instance);
		printk(KERN_ERR "scsi%d: reselection after won arbitration?\n",
		       HOSTNO);
		NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
		return -1;
	}
L
Linus Torvalds 已提交
1517
#else
1518 1519
	while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY))
		;
L
Linus Torvalds 已提交
1520 1521
#endif

1522 1523 1524 1525 1526
	/*
	 * No less than two deskew delays after the initiator detects the
	 * BSY signal is true, it shall release the SEL signal and may
	 * change the DATA BUS.                                     -wingel
	 */
L
Linus Torvalds 已提交
1527

1528
	udelay(1);
L
Linus Torvalds 已提交
1529

1530
	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
L
Linus Torvalds 已提交
1531

1532 1533 1534 1535 1536 1537
	if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
		NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
		if (hostdata->targets_present & (1 << cmd->device->id)) {
			printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO);
			if (hostdata->restart_select)
				printk(KERN_NOTICE "\trestart select\n");
1538
			NCR5380_dprint(NDEBUG_ANY, instance);
1539 1540 1541 1542
			NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
			return -1;
		}
		cmd->result = DID_BAD_TARGET << 16;
L
Linus Torvalds 已提交
1543
#ifdef SUPPORT_TAGS
1544
		cmd_free_tag(cmd);
L
Linus Torvalds 已提交
1545
#endif
1546 1547
		cmd->scsi_done(cmd);
		NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
F
Finn Thain 已提交
1548
		dprintk(NDEBUG_SELECTION, "scsi%d: target did not respond within 250ms\n", HOSTNO);
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
		NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
		return 0;
	}

	hostdata->targets_present |= (1 << cmd->device->id);

	/*
	 * Since we followed the SCSI spec, and raised ATN while SEL
	 * was true but before BSY was false during selection, the information
	 * transfer phase should be a MESSAGE OUT phase so that we can send the
	 * IDENTIFY message.
	 *
	 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
	 * message (2 bytes) with a tag ID that we increment with every command
	 * until it wraps back to 0.
	 *
	 * XXX - it turns out that there are some broken SCSI-II devices,
	 *	     which claim to support tagged queuing but fail when more than
	 *	     some number of commands are issued at once.
	 */

	/* Wait for start of REQ/ACK handshake */
	while (!(NCR5380_read(STATUS_REG) & SR_REQ))
		;

F
Finn Thain 已提交
1574
	dprintk(NDEBUG_SELECTION, "scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
1575 1576
		   HOSTNO, cmd->device->id);
	tmp[0] = IDENTIFY(1, cmd->device->lun);
L
Linus Torvalds 已提交
1577 1578

#ifdef SUPPORT_TAGS
1579 1580 1581 1582 1583 1584
	if (cmd->tag != TAG_NONE) {
		tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG;
		tmp[2] = cmd->tag;
		len = 3;
	} else
		len = 1;
L
Linus Torvalds 已提交
1585
#else
1586 1587
	len = 1;
	cmd->tag = 0;
L
Linus Torvalds 已提交
1588 1589
#endif /* SUPPORT_TAGS */

1590 1591 1592 1593
	/* Send message(s) */
	data = tmp;
	phase = PHASE_MSGOUT;
	NCR5380_transfer_pio(instance, &phase, &len, &data);
F
Finn Thain 已提交
1594
	dprintk(NDEBUG_SELECTION, "scsi%d: nexus established.\n", HOSTNO);
1595 1596
	/* XXX need to handle errors here */
	hostdata->connected = cmd;
L
Linus Torvalds 已提交
1597
#ifndef SUPPORT_TAGS
1598 1599
	hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
#endif
1600 1601 1602
#ifdef SUN3_SCSI_VME
	dregs->csr |= CSR_INTR;
#endif
L
Linus Torvalds 已提交
1603

1604
	initialize_SCp(cmd);
L
Linus Torvalds 已提交
1605

1606
	return 0;
L
Linus Torvalds 已提交
1607 1608
}

1609 1610
/*
 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
L
Linus Torvalds 已提交
1611 1612 1613 1614
 *      unsigned char *phase, int *count, unsigned char **data)
 *
 * Purpose : transfers data in given phase using polled I/O
 *
1615 1616
 * Inputs : instance - instance of driver, *phase - pointer to
 *	what phase is expected, *count - pointer to number of
L
Linus Torvalds 已提交
1617
 *	bytes to transfer, **data - pointer to data pointer.
1618
 *
L
Linus Torvalds 已提交
1619
 * Returns : -1 when different phase is entered without transferring
L
Lucas De Marchi 已提交
1620
 *	maximum number of bytes, 0 if all bytes are transferred or exit
L
Linus Torvalds 已提交
1621 1622
 *	is in same phase.
 *
1623
 *	Also, *phase, *count, *data are modified in place.
L
Linus Torvalds 已提交
1624 1625 1626 1627 1628
 *
 * XXX Note : handling for bus free may be useful.
 */

/*
1629
 * Note : this code is not as quick as it could be, however it
L
Linus Torvalds 已提交
1630 1631 1632 1633
 * IS 100% reliable, and for the actual data transfer where speed
 * counts, we will always do a pseudo DMA or DMA transfer.
 */

1634 1635 1636
static int NCR5380_transfer_pio(struct Scsi_Host *instance,
				unsigned char *phase, int *count,
				unsigned char **data)
L
Linus Torvalds 已提交
1637
{
1638 1639 1640 1641 1642 1643 1644 1645
	register unsigned char p = *phase, tmp;
	register int c = *count;
	register unsigned char *d = *data;

	/*
	 * The NCR5380 chip will only drive the SCSI bus when the
	 * phase specified in the appropriate bits of the TARGET COMMAND
	 * REGISTER match the STATUS REGISTER
L
Linus Torvalds 已提交
1646 1647
	 */

1648
	NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
L
Linus Torvalds 已提交
1649

1650 1651 1652 1653 1654 1655 1656
	do {
		/*
		 * Wait for assertion of REQ, after which the phase bits will be
		 * valid
		 */
		while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ))
			;
L
Linus Torvalds 已提交
1657

F
Finn Thain 已提交
1658
		dprintk(NDEBUG_HANDSHAKE, "scsi%d: REQ detected\n", HOSTNO);
L
Linus Torvalds 已提交
1659

1660 1661
		/* Check for phase mismatch */
		if ((tmp & PHASE_MASK) != p) {
F
Finn Thain 已提交
1662
			dprintk(NDEBUG_PIO, "scsi%d: phase mismatch\n", HOSTNO);
1663
			NCR5380_dprint_phase(NDEBUG_PIO, instance);
1664 1665
			break;
		}
L
Linus Torvalds 已提交
1666

1667 1668 1669 1670 1671
		/* Do actual transfer from SCSI bus to / from memory */
		if (!(p & SR_IO))
			NCR5380_write(OUTPUT_DATA_REG, *d);
		else
			*d = NCR5380_read(CURRENT_SCSI_DATA_REG);
L
Linus Torvalds 已提交
1672

1673
		++d;
L
Linus Torvalds 已提交
1674

1675 1676 1677 1678 1679 1680
		/*
		 * The SCSI standard suggests that in MSGOUT phase, the initiator
		 * should drop ATN on the last byte of the message phase
		 * after REQ has been asserted for the handshake but before
		 * the initiator raises ACK.
		 */
L
Linus Torvalds 已提交
1681

1682 1683 1684
		if (!(p & SR_IO)) {
			if (!((p & SR_MSG) && c > 1)) {
				NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1685
				NCR5380_dprint(NDEBUG_PIO, instance);
1686 1687 1688 1689 1690
				NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
					      ICR_ASSERT_DATA | ICR_ASSERT_ACK);
			} else {
				NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
					      ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1691
				NCR5380_dprint(NDEBUG_PIO, instance);
1692 1693 1694 1695
				NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
					      ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
			}
		} else {
1696
			NCR5380_dprint(NDEBUG_PIO, instance);
1697 1698
			NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
		}
L
Linus Torvalds 已提交
1699

1700 1701 1702
		while (NCR5380_read(STATUS_REG) & SR_REQ)
			;

F
Finn Thain 已提交
1703
		dprintk(NDEBUG_HANDSHAKE, "scsi%d: req false, handshake complete\n", HOSTNO);
1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723

		/*
		 * We have several special cases to consider during REQ/ACK handshaking :
		 * 1.  We were in MSGOUT phase, and we are on the last byte of the
		 *	message.  ATN must be dropped as ACK is dropped.
		 *
		 * 2.  We are in a MSGIN phase, and we are on the last byte of the
		 *	message.  We must exit with ACK asserted, so that the calling
		 *	code may raise ATN before dropping ACK to reject the message.
		 *
		 * 3.  ACK and ATN are clear and the target may proceed as normal.
		 */
		if (!(p == PHASE_MSGIN && c == 1)) {
			if (p == PHASE_MSGOUT && c > 1)
				NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
			else
				NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
		}
	} while (--c);

F
Finn Thain 已提交
1724
	dprintk(NDEBUG_PIO, "scsi%d: residual %d\n", HOSTNO, c);
1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741

	*count = c;
	*data = d;
	tmp = NCR5380_read(STATUS_REG);
	/* The phase read from the bus is valid if either REQ is (already)
	 * asserted or if ACK hasn't been released yet. The latter is the case if
	 * we're in MSGIN and all wanted bytes have been received.
	 */
	if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0))
		*phase = tmp & PHASE_MASK;
	else
		*phase = PHASE_UNKNOWN;

	if (!c || (*phase == p))
		return 0;
	else
		return -1;
L
Linus Torvalds 已提交
1742 1743 1744 1745
}

/*
 * Function : do_abort (Scsi_Host *host)
1746 1747 1748 1749
 *
 * Purpose : abort the currently established nexus.  Should only be
 *	called from a routine which can drop into a
 *
L
Linus Torvalds 已提交
1750 1751 1752
 * Returns : 0 on success, -1 on failure.
 */

1753
static int do_abort(struct Scsi_Host *instance)
L
Linus Torvalds 已提交
1754
{
1755 1756 1757 1758
	unsigned char tmp, *msgptr, phase;
	int len;

	/* Request message out phase */
L
Linus Torvalds 已提交
1759
	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770

	/*
	 * Wait for the target to indicate a valid phase by asserting
	 * REQ.  Once this happens, we'll have either a MSGOUT phase
	 * and can immediately send the ABORT message, or we'll have some
	 * other phase and will have to source/sink data.
	 *
	 * We really don't care what value was on the bus or what value
	 * the target sees, so we just handshake.
	 */

1771
	while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ))
1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787
		;

	NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));

	if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
		NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
			      ICR_ASSERT_ACK);
		while (NCR5380_read(STATUS_REG) & SR_REQ)
			;
		NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
	}

	tmp = ABORT;
	msgptr = &tmp;
	len = 1;
	phase = PHASE_MSGOUT;
1788
	NCR5380_transfer_pio(instance, &phase, &len, &msgptr);
1789 1790 1791 1792 1793 1794 1795

	/*
	 * If we got here, and the command completed successfully,
	 * we're about to go into bus free state.
	 */

	return len ? -1 : 0;
L
Linus Torvalds 已提交
1796 1797 1798
}

#if defined(REAL_DMA)
1799 1800
/*
 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
L
Linus Torvalds 已提交
1801 1802 1803 1804 1805
 *      unsigned char *phase, int *count, unsigned char **data)
 *
 * Purpose : transfers data in given phase using either real
 *	or pseudo DMA.
 *
1806 1807
 * Inputs : instance - instance of driver, *phase - pointer to
 *	what phase is expected, *count - pointer to number of
L
Linus Torvalds 已提交
1808
 *	bytes to transfer, **data - pointer to data pointer.
1809
 *
L
Linus Torvalds 已提交
1810
 * Returns : -1 when different phase is entered without transferring
L
Lucas De Marchi 已提交
1811
 *	maximum number of bytes, 0 if all bytes or transferred or exit
L
Linus Torvalds 已提交
1812 1813
 *	is in same phase.
 *
1814
 *	Also, *phase, *count, *data are modified in place.
L
Linus Torvalds 已提交
1815 1816 1817 1818
 *
 */


1819 1820 1821
static int NCR5380_transfer_dma(struct Scsi_Host *instance,
				unsigned char *phase, int *count,
				unsigned char **data)
L
Linus Torvalds 已提交
1822
{
1823 1824 1825
	SETUP_HOSTDATA(instance);
	register int c = *count;
	register unsigned char p = *phase;
1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 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
	unsigned long flags;

#if defined(CONFIG_SUN3)
	/* sanity check */
	if (!sun3_dma_setup_done) {
		pr_err("scsi%d: transfer_dma without setup!\n",
		       instance->host_no);
		BUG();
	}
	hostdata->dma_len = c;

	dprintk(NDEBUG_DMA, "scsi%d: initializing DMA for %s, %d bytes %s %p\n",
		instance->host_no, (p & SR_IO) ? "reading" : "writing",
		c, (p & SR_IO) ? "to" : "from", *data);

	/* netbsd turns off ints here, why not be safe and do it too */
	local_irq_save(flags);

	/* send start chain */
	sun3scsi_dma_start(c, *data);

	if (p & SR_IO) {
		NCR5380_write(TARGET_COMMAND_REG, 1);
		NCR5380_read(RESET_PARITY_INTERRUPT_REG);
		NCR5380_write(INITIATOR_COMMAND_REG, 0);
		NCR5380_write(MODE_REG,
			      (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR));
		NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
	} else {
		NCR5380_write(TARGET_COMMAND_REG, 0);
		NCR5380_read(RESET_PARITY_INTERRUPT_REG);
		NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_DATA);
		NCR5380_write(MODE_REG,
			      (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR));
		NCR5380_write(START_DMA_SEND_REG, 0);
	}

#ifdef SUN3_SCSI_VME
	dregs->csr |= CSR_DMA_ENABLE;
#endif

	local_irq_restore(flags);

	sun3_dma_active = 1;

#else /* !defined(CONFIG_SUN3) */
1872 1873 1874 1875 1876 1877 1878
	register unsigned char *d = *data;
	unsigned char tmp;

	if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
		*phase = tmp;
		return -1;
	}
L
Linus Torvalds 已提交
1879

1880 1881
	if (hostdata->read_overruns && (p & SR_IO))
		c -= hostdata->read_overruns;
L
Linus Torvalds 已提交
1882

F
Finn Thain 已提交
1883
	dprintk(NDEBUG_DMA, "scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1884 1885
		   HOSTNO, (p & SR_IO) ? "reading" : "writing",
		   c, (p & SR_IO) ? "to" : "from", d);
L
Linus Torvalds 已提交
1886

1887
	NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
L
Linus Torvalds 已提交
1888 1889

#ifdef REAL_DMA
1890
	NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
L
Linus Torvalds 已提交
1891 1892
#endif /* def REAL_DMA  */

1893
	if (!(hostdata->flags & FLAG_LATE_DMA_SETUP)) {
1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910
		/* On the Medusa, it is a must to initialize the DMA before
		 * starting the NCR. This is also the cleaner way for the TT.
		 */
		local_irq_save(flags);
		hostdata->dma_len = (p & SR_IO) ?
			NCR5380_dma_read_setup(instance, d, c) :
			NCR5380_dma_write_setup(instance, d, c);
		local_irq_restore(flags);
	}

	if (p & SR_IO)
		NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
	else {
		NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
		NCR5380_write(START_DMA_SEND_REG, 0);
	}

1911
	if (hostdata->flags & FLAG_LATE_DMA_SETUP) {
1912 1913 1914 1915 1916 1917 1918 1919 1920
		/* On the Falcon, the DMA setup must be done after the last */
		/* NCR access, else the DMA setup gets trashed!
		 */
		local_irq_save(flags);
		hostdata->dma_len = (p & SR_IO) ?
			NCR5380_dma_read_setup(instance, d, c) :
			NCR5380_dma_write_setup(instance, d, c);
		local_irq_restore(flags);
	}
1921 1922
#endif /* !defined(CONFIG_SUN3) */

1923
	return 0;
L
Linus Torvalds 已提交
1924 1925 1926 1927 1928 1929
}
#endif /* defined(REAL_DMA) */

/*
 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
 *
1930 1931
 * Purpose : run through the various SCSI phases and do as the target
 *	directs us to.  Operates on the currently connected command,
L
Linus Torvalds 已提交
1932 1933 1934 1935
 *	instance->connected.
 *
 * Inputs : instance, instance for which we are doing commands
 *
1936
 * Side effects : SCSI things happen, the disconnected queue will be
L
Linus Torvalds 已提交
1937 1938 1939
 *	modified if a command disconnects, *instance->connected will
 *	change.
 *
1940 1941
 * XXX Note : we need to watch for bus free or a reset condition here
 *	to recover from an unexpected bus free condition.
L
Linus Torvalds 已提交
1942
 */
1943 1944

static void NCR5380_information_transfer(struct Scsi_Host *instance)
L
Linus Torvalds 已提交
1945
{
1946 1947 1948 1949 1950
	SETUP_HOSTDATA(instance);
	unsigned long flags;
	unsigned char msgout = NOP;
	int sink = 0;
	int len;
L
Linus Torvalds 已提交
1951
#if defined(REAL_DMA)
1952
	int transfersize;
L
Linus Torvalds 已提交
1953
#endif
1954 1955
	unsigned char *data;
	unsigned char phase, tmp, extended_msg[10], old_phase = 0xff;
F
Finn Thain 已提交
1956
	struct scsi_cmnd *cmd = (struct scsi_cmnd *) hostdata->connected;
1957

1958 1959 1960 1961
#ifdef SUN3_SCSI_VME
	dregs->csr |= CSR_INTR;
#endif

1962 1963 1964 1965 1966 1967 1968
	while (1) {
		tmp = NCR5380_read(STATUS_REG);
		/* We only have a valid SCSI phase when REQ is asserted */
		if (tmp & SR_REQ) {
			phase = (tmp & PHASE_MASK);
			if (phase != old_phase) {
				old_phase = phase;
1969
				NCR5380_dprint_phase(NDEBUG_INFORMATION, instance);
1970
			}
1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997
#if defined(CONFIG_SUN3)
			if (phase == PHASE_CMDOUT) {
#if defined(REAL_DMA)
				void *d;
				unsigned long count;

				if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
					count = cmd->SCp.buffer->length;
					d = sg_virt(cmd->SCp.buffer);
				} else {
					count = cmd->SCp.this_residual;
					d = cmd->SCp.ptr;
				}
				/* this command setup for dma yet? */
				if ((count >= DMA_MIN_SIZE) && (sun3_dma_setup_done != cmd)) {
					if (cmd->request->cmd_type == REQ_TYPE_FS) {
						sun3scsi_dma_setup(d, count,
						                   rq_data_dir(cmd->request));
						sun3_dma_setup_done = cmd;
					}
				}
#endif
#ifdef SUN3_SCSI_VME
				dregs->csr |= CSR_INTR;
#endif
			}
#endif /* CONFIG_SUN3 */
L
Linus Torvalds 已提交
1998

1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013
			if (sink && (phase != PHASE_MSGOUT)) {
				NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));

				NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
					      ICR_ASSERT_ACK);
				while (NCR5380_read(STATUS_REG) & SR_REQ)
					;
				NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
					      ICR_ASSERT_ATN);
				sink = 0;
				continue;
			}

			switch (phase) {
			case PHASE_DATAOUT:
L
Linus Torvalds 已提交
2014
#if (NDEBUG & NDEBUG_NO_DATAOUT)
2015 2016 2017 2018 2019
				printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
				       "aborted\n", HOSTNO);
				sink = 1;
				do_abort(instance);
				cmd->result = DID_ERROR << 16;
2020
				cmd->scsi_done(cmd);
2021
				return;
L
Linus Torvalds 已提交
2022
#endif
2023 2024 2025 2026 2027 2028 2029 2030 2031 2032
			case PHASE_DATAIN:
				/*
				 * If there is no room left in the current buffer in the
				 * scatter-gather list, move onto the next one.
				 */

				if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
					++cmd->SCp.buffer;
					--cmd->SCp.buffers_residual;
					cmd->SCp.this_residual = cmd->SCp.buffer->length;
J
Jens Axboe 已提交
2033
					cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
2034 2035 2036 2037
					/* ++roman: Try to merge some scatter-buffers if
					 * they are at contiguous physical addresses.
					 */
					merge_contiguous_buffers(cmd);
F
Finn Thain 已提交
2038
					dprintk(NDEBUG_INFORMATION, "scsi%d: %d bytes and %d buffers left\n",
2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056
						   HOSTNO, cmd->SCp.this_residual,
						   cmd->SCp.buffers_residual);
				}

				/*
				 * The preferred transfer method is going to be
				 * PSEUDO-DMA for systems that are strictly PIO,
				 * since we can let the hardware do the handshaking.
				 *
				 * For this to work, we need to know the transfersize
				 * ahead of time, since the pseudo-DMA code will sit
				 * in an unconditional loop.
				 */

				/* ++roman: I suggest, this should be
				 *   #if def(REAL_DMA)
				 * instead of leaving REAL_DMA out.
				 */
L
Linus Torvalds 已提交
2057 2058

#if defined(REAL_DMA)
2059 2060 2061 2062 2063
				if (
#if !defined(CONFIG_SUN3)
				    !cmd->device->borken &&
#endif
				    (transfersize = NCR5380_dma_xfer_len(instance, cmd, phase)) >= DMA_MIN_SIZE) {
2064 2065 2066 2067 2068 2069 2070 2071
					len = transfersize;
					cmd->SCp.phase = phase;
					if (NCR5380_transfer_dma(instance, &phase,
					    &len, (unsigned char **)&cmd->SCp.ptr)) {
						/*
						 * If the watchdog timer fires, all future
						 * accesses to this device will use the
						 * polled-IO. */
F
Finn Thain 已提交
2072 2073
						scmd_printk(KERN_INFO, cmd,
							"switching to slow handshake\n");
2074 2075 2076 2077 2078 2079
						cmd->device->borken = 1;
						NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
							ICR_ASSERT_ATN);
						sink = 1;
						do_abort(instance);
						cmd->result = DID_ERROR << 16;
2080
						cmd->scsi_done(cmd);
2081 2082
						/* XXX - need to source or sink data here, as appropriate */
					} else {
L
Linus Torvalds 已提交
2083
#ifdef REAL_DMA
2084 2085 2086 2087 2088 2089 2090 2091
						/* ++roman: When using real DMA,
						 * information_transfer() should return after
						 * starting DMA since it has nothing more to
						 * do.
						 */
						return;
#else
						cmd->SCp.this_residual -= transfersize - len;
L
Linus Torvalds 已提交
2092
#endif
2093 2094
					}
				} else
L
Linus Torvalds 已提交
2095
#endif /* defined(REAL_DMA) */
2096 2097 2098
					NCR5380_transfer_pio(instance, &phase,
							     (int *)&cmd->SCp.this_residual,
							     (unsigned char **)&cmd->SCp.ptr);
2099 2100 2101 2102 2103
#if defined(CONFIG_SUN3) && defined(REAL_DMA)
				/* if we had intended to dma that command clear it */
				if (sun3_dma_setup_done == cmd)
					sun3_dma_setup_done = NULL;
#endif
2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122
				break;
			case PHASE_MSGIN:
				len = 1;
				data = &tmp;
				NCR5380_write(SELECT_ENABLE_REG, 0);	/* disable reselects */
				NCR5380_transfer_pio(instance, &phase, &len, &data);
				cmd->SCp.Message = tmp;

				switch (tmp) {
				/*
				 * Linking lets us reduce the time required to get the
				 * next command out to the device, hopefully this will
				 * mean we don't waste another revolution due to the delays
				 * required by ARBITRATION and another SELECTION.
				 *
				 * In the current implementation proposal, low level drivers
				 * merely have to start the next command, pointed to by
				 * next_link, done() is called as with unlinked commands.
				 */
L
Linus Torvalds 已提交
2123
#ifdef LINKED
2124 2125 2126 2127 2128
				case LINKED_CMD_COMPLETE:
				case LINKED_FLG_CMD_COMPLETE:
					/* Accept message by clearing ACK */
					NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);

H
Hannes Reinecke 已提交
2129
					dprintk(NDEBUG_LINKED, "scsi%d: target %d lun %llu linked command "
2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140
						   "complete.\n", HOSTNO, cmd->device->id, cmd->device->lun);

					/* Enable reselect interrupts */
					NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
					/*
					 * Sanity check : A linked command should only terminate
					 * with one of these messages if there are more linked
					 * commands available.
					 */

					if (!cmd->next_link) {
H
Hannes Reinecke 已提交
2141
						 printk(KERN_NOTICE "scsi%d: target %d lun %llu "
2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153
							"linked command complete, no next_link\n",
							HOSTNO, cmd->device->id, cmd->device->lun);
						sink = 1;
						do_abort(instance);
						return;
					}

					initialize_SCp(cmd->next_link);
					/* The next command is still part of this process; copy it
					 * and don't free it! */
					cmd->next_link->tag = cmd->tag;
					cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
H
Hannes Reinecke 已提交
2154
					dprintk(NDEBUG_LINKED, "scsi%d: target %d lun %llu linked request "
2155 2156 2157 2158 2159
						   "done, calling scsi_done().\n",
						   HOSTNO, cmd->device->id, cmd->device->lun);
					cmd->scsi_done(cmd);
					cmd = hostdata->connected;
					break;
L
Linus Torvalds 已提交
2160
#endif /* def LINKED */
2161 2162 2163 2164
				case ABORT:
				case COMMAND_COMPLETE:
					/* Accept message by clearing ACK */
					NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
H
Hannes Reinecke 已提交
2165
					dprintk(NDEBUG_QUEUES, "scsi%d: command for target %d, lun %llu "
2166
						  "completed\n", HOSTNO, cmd->device->id, cmd->device->lun);
2167 2168 2169 2170

					local_irq_save(flags);
					hostdata->retain_dma_intr++;
					hostdata->connected = NULL;
L
Linus Torvalds 已提交
2171
#ifdef SUPPORT_TAGS
2172 2173 2174 2175 2176 2177 2178 2179 2180 2181
					cmd_free_tag(cmd);
					if (status_byte(cmd->SCp.Status) == QUEUE_FULL) {
						/* Turn a QUEUE FULL status into BUSY, I think the
						 * mid level cannot handle QUEUE FULL :-( (The
						 * command is retried after BUSY). Also update our
						 * queue size to the number of currently issued
						 * commands now.
						 */
						/* ++Andreas: the mid level code knows about
						   QUEUE_FULL now. */
2182
						struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][cmd->device->lun];
H
Hannes Reinecke 已提交
2183
						dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %llu returned "
2184 2185 2186 2187 2188 2189
							   "QUEUE_FULL after %d commands\n",
							   HOSTNO, cmd->device->id, cmd->device->lun,
							   ta->nr_allocated);
						if (ta->queue_size > ta->nr_allocated)
							ta->nr_allocated = ta->queue_size;
					}
L
Linus Torvalds 已提交
2190
#else
2191
					hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
L
Linus Torvalds 已提交
2192
#endif
2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215
					/* Enable reselect interrupts */
					NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);

					/*
					 * I'm not sure what the correct thing to do here is :
					 *
					 * If the command that just executed is NOT a request
					 * sense, the obvious thing to do is to set the result
					 * code to the values of the stored parameters.
					 *
					 * If it was a REQUEST SENSE command, we need some way to
					 * differentiate between the failure code of the original
					 * and the failure code of the REQUEST sense - the obvious
					 * case is success, where we fall through and leave the
					 * result code unchanged.
					 *
					 * The non-obvious place is where the REQUEST SENSE failed
					 */

					if (cmd->cmnd[0] != REQUEST_SENSE)
						cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
					else if (status_byte(cmd->SCp.Status) != GOOD)
						cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
L
Linus Torvalds 已提交
2216

2217 2218 2219 2220 2221 2222
					if ((cmd->cmnd[0] == REQUEST_SENSE) &&
						hostdata->ses.cmd_len) {
						scsi_eh_restore_cmnd(cmd, &hostdata->ses);
						hostdata->ses.cmd_len = 0 ;
					}

2223 2224
					if ((cmd->cmnd[0] != REQUEST_SENSE) &&
					    (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
2225 2226
						scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0);

F
Finn Thain 已提交
2227
						dprintk(NDEBUG_AUTOSENSE, "scsi%d: performing request sense\n", HOSTNO);
2228 2229

						LIST(cmd,hostdata->issue_queue);
2230
						SET_NEXT(cmd, hostdata->issue_queue);
F
Finn Thain 已提交
2231
						hostdata->issue_queue = (struct scsi_cmnd *) cmd;
F
Finn Thain 已提交
2232
						dprintk(NDEBUG_QUEUES, "scsi%d: REQUEST SENSE added to head of "
2233
							  "issue queue\n", H_NO(cmd));
2234
					} else {
2235 2236 2237
						cmd->scsi_done(cmd);
					}

2238 2239
					local_irq_restore(flags);

2240 2241 2242 2243 2244 2245 2246 2247 2248 2249
					NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
					/*
					 * Restore phase bits to 0 so an interrupted selection,
					 * arbitration can resume.
					 */
					NCR5380_write(TARGET_COMMAND_REG, 0);

					while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
						barrier();

2250
					local_irq_save(flags);
2251
					hostdata->retain_dma_intr--;
2252 2253 2254 2255
					/* ++roman: For Falcon SCSI, release the lock on the
					 * ST-DMA here if no other commands are waiting on the
					 * disconnected queue.
					 */
2256 2257
					maybe_release_dma_irq(instance);
					local_irq_restore(flags);
2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276
					return;
				case MESSAGE_REJECT:
					/* Accept message by clearing ACK */
					NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
					/* Enable reselect interrupts */
					NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
					switch (hostdata->last_message) {
					case HEAD_OF_QUEUE_TAG:
					case ORDERED_QUEUE_TAG:
					case SIMPLE_QUEUE_TAG:
						/* The target obviously doesn't support tagged
						 * queuing, even though it announced this ability in
						 * its INQUIRY data ?!? (maybe only this LUN?) Ok,
						 * clear 'tagged_supported' and lock the LUN, since
						 * the command is treated as untagged further on.
						 */
						cmd->device->tagged_supported = 0;
						hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
						cmd->tag = TAG_NONE;
H
Hannes Reinecke 已提交
2277
						dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %llu rejected "
2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289
							   "QUEUE_TAG message; tagged queuing "
							   "disabled\n",
							   HOSTNO, cmd->device->id, cmd->device->lun);
						break;
					}
					break;
				case DISCONNECT:
					/* Accept message by clearing ACK */
					NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
					local_irq_save(flags);
					cmd->device->disconnect = 1;
					LIST(cmd,hostdata->disconnected_queue);
2290
					SET_NEXT(cmd, hostdata->disconnected_queue);
2291 2292 2293
					hostdata->connected = NULL;
					hostdata->disconnected_queue = cmd;
					local_irq_restore(flags);
H
Hannes Reinecke 已提交
2294
					dprintk(NDEBUG_QUEUES, "scsi%d: command for target %d lun %llu was "
2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308
						  "moved from connected to the "
						  "disconnected_queue\n", HOSTNO,
						  cmd->device->id, cmd->device->lun);
					/*
					 * Restore phase bits to 0 so an interrupted selection,
					 * arbitration can resume.
					 */
					NCR5380_write(TARGET_COMMAND_REG, 0);

					/* Enable reselect interrupts */
					NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
					/* Wait for bus free to avoid nasty timeouts */
					while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
						barrier();
2309 2310 2311
#ifdef SUN3_SCSI_VME
					dregs->csr |= CSR_DMA_ENABLE;
#endif
2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346
					return;
					/*
					 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
					 * operation, in violation of the SCSI spec so we can safely
					 * ignore SAVE/RESTORE pointers calls.
					 *
					 * Unfortunately, some disks violate the SCSI spec and
					 * don't issue the required SAVE_POINTERS message before
					 * disconnecting, and we have to break spec to remain
					 * compatible.
					 */
				case SAVE_POINTERS:
				case RESTORE_POINTERS:
					/* Accept message by clearing ACK */
					NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
					/* Enable reselect interrupts */
					NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
					break;
				case EXTENDED_MESSAGE:
					/*
					 * Extended messages are sent in the following format :
					 * Byte
					 * 0		EXTENDED_MESSAGE == 1
					 * 1		length (includes one byte for code, doesn't
					 *		include first two bytes)
					 * 2		code
					 * 3..length+1	arguments
					 *
					 * Start the extended message buffer with the EXTENDED_MESSAGE
					 * byte, since spi_print_msg() wants the whole thing.
					 */
					extended_msg[0] = EXTENDED_MESSAGE;
					/* Accept first byte by clearing ACK */
					NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);

F
Finn Thain 已提交
2347
					dprintk(NDEBUG_EXTENDED, "scsi%d: receiving extended message\n", HOSTNO);
2348 2349 2350 2351 2352

					len = 2;
					data = extended_msg + 1;
					phase = PHASE_MSGIN;
					NCR5380_transfer_pio(instance, &phase, &len, &data);
F
Finn Thain 已提交
2353
					dprintk(NDEBUG_EXTENDED, "scsi%d: length=%d, code=0x%02x\n", HOSTNO,
2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364
						   (int)extended_msg[1], (int)extended_msg[2]);

					if (!len && extended_msg[1] <=
					    (sizeof(extended_msg) - 1)) {
						/* Accept third byte by clearing ACK */
						NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
						len = extended_msg[1] - 1;
						data = extended_msg + 3;
						phase = PHASE_MSGIN;

						NCR5380_transfer_pio(instance, &phase, &len, &data);
F
Finn Thain 已提交
2365
						dprintk(NDEBUG_EXTENDED, "scsi%d: message received, residual %d\n",
2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392
							   HOSTNO, len);

						switch (extended_msg[2]) {
						case EXTENDED_SDTR:
						case EXTENDED_WDTR:
						case EXTENDED_MODIFY_DATA_POINTER:
						case EXTENDED_EXTENDED_IDENTIFY:
							tmp = 0;
						}
					} else if (len) {
						printk(KERN_NOTICE "scsi%d: error receiving "
						       "extended message\n", HOSTNO);
						tmp = 0;
					} else {
						printk(KERN_NOTICE "scsi%d: extended message "
							   "code %02x length %d is too long\n",
							   HOSTNO, extended_msg[2], extended_msg[1]);
						tmp = 0;
					}
					/* Fall through to reject message */

					/*
					 * If we get something weird that we aren't expecting,
					 * reject it.
					 */
				default:
					if (!tmp) {
F
Finn Thain 已提交
2393 2394
						printk(KERN_INFO "scsi%d: rejecting message ",
						       instance->host_no);
2395 2396 2397
						spi_print_msg(extended_msg);
						printk("\n");
					} else if (tmp != EXTENDED_MESSAGE)
F
Finn Thain 已提交
2398 2399 2400
						scmd_printk(KERN_INFO, cmd,
						            "rejecting unknown message %02x\n",
						            tmp);
2401
					else
F
Finn Thain 已提交
2402 2403 2404
						scmd_printk(KERN_INFO, cmd,
						            "rejecting unknown extended message code %02x, length %d\n",
						            extended_msg[1], extended_msg[0]);
2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416

					msgout = MESSAGE_REJECT;
					NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
					break;
				} /* switch (tmp) */
				break;
			case PHASE_MSGOUT:
				len = 1;
				data = &msgout;
				hostdata->last_message = msgout;
				NCR5380_transfer_pio(instance, &phase, &len, &data);
				if (msgout == ABORT) {
2417
					local_irq_save(flags);
L
Linus Torvalds 已提交
2418
#ifdef SUPPORT_TAGS
2419
					cmd_free_tag(cmd);
L
Linus Torvalds 已提交
2420
#else
2421
					hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
L
Linus Torvalds 已提交
2422
#endif
2423 2424 2425
					hostdata->connected = NULL;
					cmd->result = DID_ERROR << 16;
					NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2426 2427 2428
					maybe_release_dma_irq(instance);
					local_irq_restore(flags);
					cmd->scsi_done(cmd);
2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450
					return;
				}
				msgout = NOP;
				break;
			case PHASE_CMDOUT:
				len = cmd->cmd_len;
				data = cmd->cmnd;
				/*
				 * XXX for performance reasons, on machines with a
				 * PSEUDO-DMA architecture we should probably
				 * use the dma transfer function.
				 */
				NCR5380_transfer_pio(instance, &phase, &len, &data);
				break;
			case PHASE_STATIN:
				len = 1;
				data = &tmp;
				NCR5380_transfer_pio(instance, &phase, &len, &data);
				cmd->SCp.Status = tmp;
				break;
			default:
				printk("scsi%d: unknown phase\n", HOSTNO);
2451
				NCR5380_dprint(NDEBUG_ANY, instance);
2452 2453 2454
			} /* switch(phase) */
		} /* if (tmp * SR_REQ) */
	} /* while (1) */
L
Linus Torvalds 已提交
2455 2456 2457 2458 2459
}

/*
 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
 *
2460
 * Purpose : does reselection, initializing the instance->connected
F
Finn Thain 已提交
2461
 *	field to point to the scsi_cmnd for which the I_T_L or I_T_L_Q
L
Linus Torvalds 已提交
2462
 *	nexus has been reestablished,
2463
 *
L
Linus Torvalds 已提交
2464 2465 2466 2467 2468
 * Inputs : instance - this instance of the NCR5380.
 *
 */


2469 2470 2471
/* it might eventually prove necessary to do a dma setup on
   reselection, but it doesn't seem to be needed now -- sam */

2472
static void NCR5380_reselect(struct Scsi_Host *instance)
L
Linus Torvalds 已提交
2473
{
2474 2475
	SETUP_HOSTDATA(instance);
	unsigned char target_mask;
2476
	unsigned char lun;
L
Linus Torvalds 已提交
2477
#ifdef SUPPORT_TAGS
2478
	unsigned char tag;
L
Linus Torvalds 已提交
2479
#endif
2480
	unsigned char msg[3];
2481 2482
	int __maybe_unused len;
	unsigned char __maybe_unused *data, __maybe_unused phase;
F
Finn Thain 已提交
2483
	struct scsi_cmnd *tmp = NULL, *prev;
2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494

	/*
	 * Disable arbitration, etc. since the host adapter obviously
	 * lost, and tell an interrupted NCR5380_select() to restart.
	 */

	NCR5380_write(MODE_REG, MR_BASE);
	hostdata->restart_select = 1;

	target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);

F
Finn Thain 已提交
2495
	dprintk(NDEBUG_RESELECTION, "scsi%d: reselect\n", HOSTNO);
2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518

	/*
	 * At this point, we have detected that our SCSI ID is on the bus,
	 * SEL is true and BSY was false for at least one bus settle delay
	 * (400 ns).
	 *
	 * We must assert BSY ourselves, until the target drops the SEL
	 * signal.
	 */

	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);

	while (NCR5380_read(STATUS_REG) & SR_SEL)
		;
	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);

	/*
	 * Wait for target to go into MSGIN.
	 */

	while (!(NCR5380_read(STATUS_REG) & SR_REQ))
		;

2519 2520 2521 2522 2523 2524 2525
#if defined(CONFIG_SUN3) && defined(REAL_DMA)
	/* acknowledge toggle to MSGIN */
	NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN));

	/* peek at the byte without really hitting the bus */
	msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG);
#else
2526 2527 2528 2529
	len = 1;
	data = msg;
	phase = PHASE_MSGIN;
	NCR5380_transfer_pio(instance, &phase, &len, &data);
2530
#endif
2531 2532 2533 2534 2535 2536 2537 2538

	if (!(msg[0] & 0x80)) {
		printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO);
		spi_print_msg(msg);
		do_abort(instance);
		return;
	}
	lun = (msg[0] & 0x07);
L
Linus Torvalds 已提交
2539

2540
#if defined(SUPPORT_TAGS) && !defined(CONFIG_SUN3)
2541 2542 2543 2544 2545
	/* If the phase is still MSGIN, the target wants to send some more
	 * messages. In case it supports tagged queuing, this is probably a
	 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
	 */
	tag = TAG_NONE;
2546
	if (phase == PHASE_MSGIN && (hostdata->flags & FLAG_TAGGED_QUEUING)) {
2547 2548 2549 2550 2551 2552 2553
		/* Accept previous IDENTIFY message by clearing ACK */
		NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
		len = 2;
		data = msg + 1;
		if (!NCR5380_transfer_pio(instance, &phase, &len, &data) &&
		    msg[1] == SIMPLE_QUEUE_TAG)
			tag = msg[2];
F
Finn Thain 已提交
2554
		dprintk(NDEBUG_TAGS, "scsi%d: target mask %02x, lun %d sent tag %d at "
2555 2556
			   "reselection\n", HOSTNO, target_mask, lun, tag);
	}
L
Linus Torvalds 已提交
2557
#endif
2558 2559 2560 2561 2562 2563

	/*
	 * Find the command corresponding to the I_T_L or I_T_L_Q  nexus we
	 * just reestablished, and remove it from the disconnected queue.
	 */

F
Finn Thain 已提交
2564
	for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue, prev = NULL;
2565 2566
	     tmp; prev = tmp, tmp = NEXT(tmp)) {
		if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
L
Linus Torvalds 已提交
2567
#ifdef SUPPORT_TAGS
2568
		    && (tag == tmp->tag)
L
Linus Torvalds 已提交
2569
#endif
2570 2571 2572
		    ) {
			if (prev) {
				REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
2573
				SET_NEXT(prev, NEXT(tmp));
2574 2575 2576 2577
			} else {
				REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp));
				hostdata->disconnected_queue = NEXT(tmp);
			}
2578
			SET_NEXT(tmp, NULL);
2579 2580
			break;
		}
L
Linus Torvalds 已提交
2581
	}
2582 2583 2584

	if (!tmp) {
		printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d "
L
Linus Torvalds 已提交
2585
#ifdef SUPPORT_TAGS
2586
		       "tag %d "
L
Linus Torvalds 已提交
2587
#endif
2588 2589
		       "not in disconnected_queue.\n",
		       HOSTNO, target_mask, lun
L
Linus Torvalds 已提交
2590
#ifdef SUPPORT_TAGS
2591
		       , tag
L
Linus Torvalds 已提交
2592
#endif
2593 2594 2595 2596 2597 2598 2599 2600
			);
		/*
		 * Since we have an established nexus that we can't do anything
		 * with, we must abort it.
		 */
		do_abort(instance);
		return;
	}
L
Linus Torvalds 已提交
2601

2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624
#if defined(CONFIG_SUN3) && defined(REAL_DMA)
	/* engage dma setup for the command we just saw */
	{
		void *d;
		unsigned long count;

		if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) {
			count = tmp->SCp.buffer->length;
			d = sg_virt(tmp->SCp.buffer);
		} else {
			count = tmp->SCp.this_residual;
			d = tmp->SCp.ptr;
		}
		/* setup this command for dma if not already */
		if ((count >= DMA_MIN_SIZE) && (sun3_dma_setup_done != tmp)) {
			sun3scsi_dma_setup(d, count, rq_data_dir(tmp->request));
			sun3_dma_setup_done = tmp;
		}
	}

	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
#endif

2625 2626
	/* Accept message by clearing ACK */
	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
L
Linus Torvalds 已提交
2627

2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646
#if defined(SUPPORT_TAGS) && defined(CONFIG_SUN3)
	/* If the phase is still MSGIN, the target wants to send some more
	 * messages. In case it supports tagged queuing, this is probably a
	 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
	 */
	tag = TAG_NONE;
	if (phase == PHASE_MSGIN && setup_use_tagged_queuing) {
		/* Accept previous IDENTIFY message by clearing ACK */
		NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
		len = 2;
		data = msg + 1;
		if (!NCR5380_transfer_pio(instance, &phase, &len, &data) &&
		    msg[1] == SIMPLE_QUEUE_TAG)
			tag = msg[2];
		dprintk(NDEBUG_TAGS, "scsi%d: target mask %02x, lun %d sent tag %d at reselection\n"
			HOSTNO, target_mask, lun, tag);
	}
#endif

2647
	hostdata->connected = tmp;
H
Hannes Reinecke 已提交
2648
	dprintk(NDEBUG_RESELECTION, "scsi%d: nexus established, target = %d, lun = %llu, tag = %d\n",
2649
		   HOSTNO, tmp->device->id, tmp->device->lun, tmp->tag);
L
Linus Torvalds 已提交
2650 2651 2652 2653
}


/*
F
Finn Thain 已提交
2654
 * Function : int NCR5380_abort (struct scsi_cmnd *cmd)
L
Linus Torvalds 已提交
2655 2656 2657
 *
 * Purpose : abort a command
 *
F
Finn Thain 已提交
2658
 * Inputs : cmd - the scsi_cmnd to abort, code - code to set the
2659
 *	host byte of the result field to, if zero DID_ABORTED is
L
Linus Torvalds 已提交
2660 2661
 *	used.
 *
2662
 * Returns : SUCCESS - success, FAILED on failure.
L
Linus Torvalds 已提交
2663
 *
2664 2665
 * XXX - there is no way to abort the command that is currently
 *	 connected, you have to wait for it to complete.  If this is
L
Linus Torvalds 已提交
2666
 *	 a problem, we could implement longjmp() / setjmp(), setjmp()
2667
 *	 called where the loop started in NCR5380_main().
L
Linus Torvalds 已提交
2668 2669 2670
 */

static
F
Finn Thain 已提交
2671
int NCR5380_abort(struct scsi_cmnd *cmd)
L
Linus Torvalds 已提交
2672
{
2673 2674
	struct Scsi_Host *instance = cmd->device->host;
	SETUP_HOSTDATA(instance);
F
Finn Thain 已提交
2675
	struct scsi_cmnd *tmp, **prev;
2676
	unsigned long flags;
L
Linus Torvalds 已提交
2677

2678
	scmd_printk(KERN_NOTICE, cmd, "aborting command\n");
L
Linus Torvalds 已提交
2679

2680 2681 2682
	NCR5380_print_status(instance);

	local_irq_save(flags);
L
Linus Torvalds 已提交
2683

F
Finn Thain 已提交
2684
	dprintk(NDEBUG_ABORT, "scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO,
2685 2686
		    NCR5380_read(BUS_AND_STATUS_REG),
		    NCR5380_read(STATUS_REG));
L
Linus Torvalds 已提交
2687 2688

#if 1
2689 2690 2691 2692 2693
	/*
	 * Case 1 : If the command is the currently executing command,
	 * we'll set the aborted flag and return control so that
	 * information transfer routine can exit cleanly.
	 */
L
Linus Torvalds 已提交
2694

2695
	if (hostdata->connected == cmd) {
L
Linus Torvalds 已提交
2696

F
Finn Thain 已提交
2697
		dprintk(NDEBUG_ABORT, "scsi%d: aborting connected command\n", HOSTNO);
2698 2699 2700 2701
		/*
		 * We should perform BSY checking, and make sure we haven't slipped
		 * into BUS FREE.
		 */
L
Linus Torvalds 已提交
2702

2703 2704 2705 2706 2707 2708
		/*	NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */
		/*
		 * Since we can't change phases until we've completed the current
		 * handshake, we have to source or sink a byte of data if the current
		 * phase is not MSGOUT.
		 */
L
Linus Torvalds 已提交
2709

2710 2711 2712 2713
		/*
		 * Return control to the executing NCR drive so we can clear the
		 * aborted flag and get back into our main loop.
		 */
L
Linus Torvalds 已提交
2714

2715 2716 2717 2718
		if (do_abort(instance) == 0) {
			hostdata->aborted = 1;
			hostdata->connected = NULL;
			cmd->result = DID_ABORT << 16;
L
Linus Torvalds 已提交
2719
#ifdef SUPPORT_TAGS
2720
			cmd_free_tag(cmd);
L
Linus Torvalds 已提交
2721
#else
2722
			hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
L
Linus Torvalds 已提交
2723
#endif
2724
			maybe_release_dma_irq(instance);
2725 2726
			local_irq_restore(flags);
			cmd->scsi_done(cmd);
2727
			return SUCCESS;
2728
		} else {
2729
			local_irq_restore(flags);
2730
			printk("scsi%d: abort of connected command failed!\n", HOSTNO);
2731
			return FAILED;
2732 2733
		}
	}
L
Linus Torvalds 已提交
2734 2735
#endif

2736 2737 2738 2739
	/*
	 * Case 2 : If the command hasn't been issued yet, we simply remove it
	 *	    from the issue queue.
	 */
F
Finn Thain 已提交
2740 2741
	for (prev = (struct scsi_cmnd **)&(hostdata->issue_queue),
	     tmp = (struct scsi_cmnd *)hostdata->issue_queue;
2742 2743 2744 2745
	     tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) {
		if (cmd == tmp) {
			REMOVE(5, *prev, tmp, NEXT(tmp));
			(*prev) = NEXT(tmp);
2746
			SET_NEXT(tmp, NULL);
2747
			tmp->result = DID_ABORT << 16;
2748
			maybe_release_dma_irq(instance);
2749
			local_irq_restore(flags);
F
Finn Thain 已提交
2750
			dprintk(NDEBUG_ABORT, "scsi%d: abort removed command from issue queue.\n",
2751 2752 2753 2754
				    HOSTNO);
			/* Tagged queuing note: no tag to free here, hasn't been assigned
			 * yet... */
			tmp->scsi_done(tmp);
2755
			return SUCCESS;
2756
		}
L
Linus Torvalds 已提交
2757 2758
	}

2759 2760 2761 2762 2763 2764 2765 2766 2767 2768
	/*
	 * Case 3 : If any commands are connected, we're going to fail the abort
	 *	    and let the high level SCSI driver retry at a later time or
	 *	    issue a reset.
	 *
	 *	    Timeouts, and therefore aborted commands, will be highly unlikely
	 *          and handling them cleanly in this situation would make the common
	 *	    case of noresets less efficient, and would pollute our code.  So,
	 *	    we fail.
	 */
L
Linus Torvalds 已提交
2769

2770 2771
	if (hostdata->connected) {
		local_irq_restore(flags);
F
Finn Thain 已提交
2772
		dprintk(NDEBUG_ABORT, "scsi%d: abort failed, command connected.\n", HOSTNO);
2773
		return FAILED;
2774
	}
L
Linus Torvalds 已提交
2775

2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800
	/*
	 * Case 4: If the command is currently disconnected from the bus, and
	 *	there are no connected commands, we reconnect the I_T_L or
	 *	I_T_L_Q nexus associated with it, go into message out, and send
	 *      an abort message.
	 *
	 * This case is especially ugly. In order to reestablish the nexus, we
	 * need to call NCR5380_select().  The easiest way to implement this
	 * function was to abort if the bus was busy, and let the interrupt
	 * handler triggered on the SEL for reselect take care of lost arbitrations
	 * where necessary, meaning interrupts need to be enabled.
	 *
	 * When interrupts are enabled, the queues may change - so we
	 * can't remove it from the disconnected queue before selecting it
	 * because that could cause a failure in hashing the nexus if that
	 * device reselected.
	 *
	 * Since the queues may change, we can't use the pointers from when we
	 * first locate it.
	 *
	 * So, we must first locate the command, and if NCR5380_select()
	 * succeeds, then issue the abort, relocate the command and remove
	 * it from the disconnected queue.
	 */

F
Finn Thain 已提交
2801
	for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; tmp;
2802 2803 2804
	     tmp = NEXT(tmp)) {
		if (cmd == tmp) {
			local_irq_restore(flags);
F
Finn Thain 已提交
2805
			dprintk(NDEBUG_ABORT, "scsi%d: aborting disconnected command.\n", HOSTNO);
2806

2807
			if (NCR5380_select(instance, cmd))
2808
				return FAILED;
L
Linus Torvalds 已提交
2809

F
Finn Thain 已提交
2810
			dprintk(NDEBUG_ABORT, "scsi%d: nexus reestablished.\n", HOSTNO);
2811 2812 2813 2814

			do_abort(instance);

			local_irq_save(flags);
F
Finn Thain 已提交
2815 2816
			for (prev = (struct scsi_cmnd **)&(hostdata->disconnected_queue),
			     tmp = (struct scsi_cmnd *)hostdata->disconnected_queue;
2817 2818 2819 2820
			     tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) {
				if (cmd == tmp) {
					REMOVE(5, *prev, tmp, NEXT(tmp));
					*prev = NEXT(tmp);
2821
					SET_NEXT(tmp, NULL);
2822 2823 2824 2825 2826
					tmp->result = DID_ABORT << 16;
					/* We must unlock the tag/LUN immediately here, since the
					 * target goes to BUS FREE and doesn't send us another
					 * message (COMMAND_COMPLETE or the like)
					 */
L
Linus Torvalds 已提交
2827
#ifdef SUPPORT_TAGS
2828
					cmd_free_tag(tmp);
L
Linus Torvalds 已提交
2829
#else
2830
					hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
L
Linus Torvalds 已提交
2831
#endif
2832
					maybe_release_dma_irq(instance);
2833 2834
					local_irq_restore(flags);
					tmp->scsi_done(tmp);
2835
					return SUCCESS;
2836 2837
				}
			}
L
Linus Torvalds 已提交
2838 2839 2840
		}
	}

2841 2842 2843 2844 2845 2846 2847
	/* Maybe it is sufficient just to release the ST-DMA lock... (if
	 * possible at all) At least, we should check if the lock could be
	 * released after the abort, in case it is kept due to some bug.
	 */
	maybe_release_dma_irq(instance);
	local_irq_restore(flags);

2848 2849 2850 2851 2852 2853 2854 2855 2856
	/*
	 * Case 5 : If we reached this point, the command was not found in any of
	 *	    the queues.
	 *
	 * We probably reached this point because of an unlikely race condition
	 * between the command completing successfully and the abortion code,
	 * so we won't panic, but we will notify the user in case something really
	 * broke.
	 */
L
Linus Torvalds 已提交
2857

2858
	printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully before abortion\n", HOSTNO);
L
Linus Torvalds 已提交
2859

2860
	return FAILED;
L
Linus Torvalds 已提交
2861 2862 2863
}


2864
/*
F
Finn Thain 已提交
2865
 * Function : int NCR5380_reset (struct scsi_cmnd *cmd)
2866
 *
L
Linus Torvalds 已提交
2867 2868
 * Purpose : reset the SCSI bus.
 *
2869
 * Returns : SUCCESS or FAILURE
L
Linus Torvalds 已提交
2870
 *
2871
 */
L
Linus Torvalds 已提交
2872

F
Finn Thain 已提交
2873
static int NCR5380_bus_reset(struct scsi_cmnd *cmd)
L
Linus Torvalds 已提交
2874
{
2875 2876
	struct Scsi_Host *instance = cmd->device->host;
	struct NCR5380_hostdata *hostdata = shost_priv(instance);
2877 2878
	int i;
	unsigned long flags;
L
Linus Torvalds 已提交
2879

2880
	NCR5380_print_status(instance);
2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903

	/* get in phase */
	NCR5380_write(TARGET_COMMAND_REG,
		      PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG)));
	/* assert RST */
	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
	udelay(40);
	/* reset NCR registers */
	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
	NCR5380_write(MODE_REG, MR_BASE);
	NCR5380_write(TARGET_COMMAND_REG, 0);
	NCR5380_write(SELECT_ENABLE_REG, 0);
	/* ++roman: reset interrupt condition! otherwise no interrupts don't get
	 * through anymore ... */
	(void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);

	/* After the reset, there are no more connected or disconnected commands
	 * and no busy units; so clear the low-level status here to avoid
	 * conflicts when the mid-level code tries to wake up the affected
	 * commands!
	 */

	if (hostdata->issue_queue)
F
Finn Thain 已提交
2904
		dprintk(NDEBUG_ABORT, "scsi%d: reset aborted issued command(s)\n", H_NO(cmd));
2905
	if (hostdata->connected)
F
Finn Thain 已提交
2906
		dprintk(NDEBUG_ABORT, "scsi%d: reset aborted a connected command\n", H_NO(cmd));
2907
	if (hostdata->disconnected_queue)
F
Finn Thain 已提交
2908
		dprintk(NDEBUG_ABORT, "scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd));
2909 2910 2911 2912 2913

	local_irq_save(flags);
	hostdata->issue_queue = NULL;
	hostdata->connected = NULL;
	hostdata->disconnected_queue = NULL;
L
Linus Torvalds 已提交
2914
#ifdef SUPPORT_TAGS
2915
	free_all_tags(hostdata);
L
Linus Torvalds 已提交
2916
#endif
2917 2918
	for (i = 0; i < 8; ++i)
		hostdata->busy[i] = 0;
L
Linus Torvalds 已提交
2919
#ifdef REAL_DMA
2920
	hostdata->dma_len = 0;
L
Linus Torvalds 已提交
2921
#endif
2922 2923

	maybe_release_dma_irq(instance);
2924
	local_irq_restore(flags);
L
Linus Torvalds 已提交
2925

2926
	return SUCCESS;
L
Linus Torvalds 已提交
2927
}