../linux/src/drivers/scsi/NCR5380.c

Bug Summary

File:	obj-scan-build/../linux/src/drivers/scsi/NCR5380.c
Location:	line 372, column 5
Description:	Value stored to 'data' is never read

Annotated Source Code

1	#ifndef NDEBUG(0x40000 \| NDEBUG_ABORT)
2	#define NDEBUG(0x40000 \| NDEBUG_ABORT) (NDEBUG_RESTART_SELECT0x40000 \| NDEBUG_ABORT)
3	#endif
4	/*
5	* NCR 5380 generic driver routines. These should make it trivial
6	* to implement 5380 SCSI drivers under Linux with a non-trantor
7	* architecture.
8	*
9	* Note that these routines also work with NR53c400 family chips.
10	*
11	* Copyright 1993, Drew Eckhardt
12	* Visionary Computing
13	* (Unix and Linux consulting and custom programming)
14	* drew@colorado.edu
15	* +1 (303) 666-5836
16	*
17	* DISTRIBUTION RELEASE 6.
18	*
19	* For more information, please consult
20	*
21	* NCR 5380 Family
22	* SCSI Protocol Controller
23	* Databook
24	*
25	* NCR Microelectronics
26	* 1635 Aeroplaza Drive
27	* Colorado Springs, CO 80916
28	* 1+ (719) 578-3400
29	* 1+ (800) 334-5454
30	*/
31
32	/*
33	* Revision 1.7 1996/3/2 Ray Van Tassle (rayvt@comm.mot.com)
34	* added proc_info
35	* added support needed for DTC 3180/3280
36	* fixed a couple of bugs
37	*
38
39	* Revision 1.5 1994/01/19 09:14:57 drew
40	* Fixed udelay() hack that was being used on DATAOUT phases
41	* instead of a proper wait for the final handshake.
42	*
43	* Revision 1.4 1994/01/19 06:44:25 drew
44	* * empty log message *
45	*
46	* Revision 1.3 1994/01/19 05:24:40 drew
47	* Added support for TCR LAST_BYTE_SENT bit.
48	*
49	* Revision 1.2 1994/01/15 06:14:11 drew
50	* REAL DMA support, bug fixes.
51	*
52	* Revision 1.1 1994/01/15 06:00:54 drew
53	* Initial revision
54	*
55	*/
56
57	/*
58	* Further development / testing that should be done :
59	* 1. Cleanup the NCR5380_transfer_dma function and DMA operation complete
60	* code so that everything does the same thing that's done at the
61	* end of a pseudo-DMA read operation.
62	*
63	* 2. Fix REAL_DMA (interrupt driven, polled works fine) -
64	* basically, transfer size needs to be reduced by one
65	* and the last byte read as is done with PSEUDO_DMA.
66	*
67	* 3. Test USLEEP code
68	*
69	* 4. Test SCSI-II tagged queueing (I have no devices which support
70	* tagged queueing)
71	*
72	* 5. Test linked command handling code after Eric is ready with
73	* the high level code.
74	*/
75
76	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_LISTS0x400000)
77	#define LIST(x,y) {printk("LINE:%d Adding %p to %p\n", __LINE__77, (void)(x), (void)(y)); if ((x)==(y)) udelay(5)(__builtin_constant_p(5) ? __const_udelay((5) * 0x10c6ul) : __udelay (5)); }
78	#define REMOVE(w,x,y,z) {printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__78, (void)(w), (void)(x), (void)(y), (void)(z)); if ((x)==(y)) udelay(5)(__builtin_constant_p(5) ? __const_udelay((5) * 0x10c6ul) : __udelay (5)); }
79	#else
80	#define LIST(x,y)
81	#define REMOVE(w,x,y,z)
82	#endif
83
84	#ifndef notyet
85	#undef LINKED
86	#undef USLEEP
87	#undef REAL_DMA
88	#endif
89
90	#ifdef REAL_DMA_POLL
91	#undef READ_OVERRUNS
92	#define READ_OVERRUNS
93	#endif
94
95	/*
96	* Design
97	* Issues :
98	*
99	* The other Linux SCSI drivers were written when Linux was Intel PC-only,
100	* and specifically for each board rather than each chip. This makes their
101	* adaptation to platforms like the Mac (Some of which use NCR5380's)
102	* more difficult than it has to be.
103	*
104	* Also, many of the SCSI drivers were written before the command queuing
105	* routines were implemented, meaning their implementations of queued
106	* commands were hacked on rather than designed in from the start.
107	*
108	* When I designed the Linux SCSI drivers I figured that
109	* while having two different SCSI boards in a system might be useful
110	* for debugging things, two of the same type wouldn't be used.
111	* Well, I was wrong and a number of users have mailed me about running
112	* multiple high-performance SCSI boards in a server.
113	*
114	* Finally, when I get questions from users, I have no idea what
115	* revision of my driver they are running.
116	*
117	* This driver attempts to address these problems :
118	* This is a generic 5380 driver. To use it on a different platform,
119	* one simply writes appropriate system specific macros (ie, data
120	* transfer - some PC's will use the I/O bus, 68K's must use
121	* memory mapped) and drops this file in their 'C' wrapper.
122	*
123	* As far as command queueing, two queues are maintained for
124	* each 5380 in the system - commands that haven't been issued yet,
125	* and commands that are currently executing. This means that an
126	* unlimited number of commands may be queued, letting
127	* more commands propagate from the higher driver levels giving higher
128	* throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
129	* allowing multiple commands to propagate all the way to a SCSI-II device
130	* while a command is already executing.
131	*
132	* To solve the multiple-boards-in-the-same-system problem,
133	* there is a separate instance structure for each instance
134	* of a 5380 in the system. So, multiple NCR5380 drivers will
135	* be able to coexist with appropriate changes to the high level
136	* SCSI code.
137	*
138	* A NCR5380_PUBLIC_REVISION macro is provided, with the release
139	* number (updated for each public release) printed by the
140	* NCR5380_print_options command, which should be called from the
141	* wrapper detect function, so that I know what release of the driver
142	* users are using.
143	*
144	* Issues specific to the NCR5380 :
145	*
146	* When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
147	* piece of hardware that requires you to sit in a loop polling for
148	* the REQ signal as long as you are connected. Some devices are
149	* brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
150	* while doing long seek operations.
151	*
152	* The workaround for this is to keep track of devices that have
153	* disconnected. If the device hasn't disconnected, for commands that
154	* should disconnect, we do something like
155	*
156	* while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
157	*
158	* Some tweaking of N and M needs to be done. An algorithm based
159	* on "time to data" would give the best results as long as short time
160	* to datas (ie, on the same track) were considered, however these
161	* broken devices are the exception rather than the rule and I'd rather
162	* spend my time optimizing for the normal case.
163	*
164	* Architecture :
165	*
166	* At the heart of the design is a coroutine, NCR5380_main,
167	* which is started when not running by the interrupt handler,
168	* timer, and queue command function. It attempts to establish
169	* I_T_L or I_T_L_Q nexuses by removing the commands from the
170	* issue queue and calling NCR5380_select() if a nexus
171	* is not established.
172	*
173	* Once a nexus is established, the NCR5380_information_transfer()
174	* phase goes through the various phases as instructed by the target.
175	* if the target goes into MSG IN and sends a DISCONNECT message,
176	* the command structure is placed into the per instance disconnected
177	* queue, and NCR5380_main tries to find more work. If USLEEP
178	* was defined, and the target is idle for too long, the system
179	* will try to sleep.
180	*
181	* If a command has disconnected, eventually an interrupt will trigger,
182	* calling NCR5380_intr() which will in turn call NCR5380_reselect
183	* to reestablish a nexus. This will run main if necessary.
184	*
185	* On command termination, the done function will be called as
186	* appropriate.
187	*
188	* SCSI pointers are maintained in the SCp field of SCSI command
189	* structures, being initialized after the command is connected
190	* in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
191	* Note that in violation of the standard, an implicit SAVE POINTERS operation
192	* is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
193	*/
194
195	/*
196	* Using this file :
197	* This file a skeleton Linux SCSI driver for the NCR 5380 series
198	* of chips. To use it, you write a architecture specific functions
199	* and macros and include this file in your driver.
200	*
201	* These macros control options :
202	* AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be
203	* defined.
204	*
205	* AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
206	* for commands that return with a CHECK CONDITION status.
207	*
208	* DIFFERENTIAL - if defined, NCR53c81 chips will use external differential
209	* transceivers.
210	*
211	* DONT_USE_INTR - if defined, never use interrupts, even if we probe or
212	* override-configure an IRQ.
213	*
214	* LIMIT_TRANSFERSIZE - if defined, limit the pseudo-dma transfers to 512
215	* bytes at a time. Since interrupts are disabled by default during
216	* these transfers, we might need this to give reasonable interrupt
217	* service time if the transfer size gets too large.
218	*
219	* LINKED - if defined, linked commands are supported.
220	*
221	* PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases.
222	*
223	* REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
224	*
225	* REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't
226	* rely on phase mismatch and EOP interrupts to determine end
227	* of phase.
228	*
229	* SCSI2 - if defined, SCSI-2 tagged queuing is used where possible
230	*
231	* UNSAFE - leave interrupts enabled during pseudo-DMA transfers. You
232	* only really want to use this if you're having a problem with
233	* dropped characters during high speed communications, and even
234	* then, you're going to be better off twiddling with transfersize
235	* in the high level code.
236	*
237	* USLEEP - if defined, on devices that aren't disconnecting from the
238	* bus, we will go to sleep so that the CPU can get real work done
239	* when we run a command that won't complete immediately.
240	*
241	* Note that if USLEEP is defined, NCR5380_TIMER must also be
242	* defined.
243	*
244	* Defaults for these will be provided if USLEEP is defined, although
245	* the user may want to adjust these to allocate CPU resources to
246	* the SCSI driver or "real" code.
247	*
248	* USLEEP_SLEEP - amount of time, in jiffies, to sleep
249	*
250	* USLEEP_POLL - amount of time, in jiffies, to poll
251	*
252	* These macros MUST be defined :
253	* NCR5380_local_declare() - declare any local variables needed for your
254	* transfer routines.
255	*
256	* NCR5380_setup(instance) - initialize any local variables needed from a given
257	* instance of the host adapter for NCR5380_{read,write,pread,pwrite}
258	*
259	* NCR5380_read(register) - read from the specified register
260	*
261	* NCR5380_write(register, value) - write to the specific register
262	*
263	* NCR5380_implementation_fields - additional fields needed for this
264	* specific implementation of the NCR5380
265	*
266	* Either real DMA or pseudo DMA may be implemented
267	* REAL functions :
268	* NCR5380_REAL_DMA should be defined if real DMA is to be used.
269	* Note that the DMA setup functions should return the number of bytes
270	* that they were able to program the controller for.
271	*
272	* Also note that generic i386/PC versions of these macros are
273	* available as NCR5380_i386_dma_write_setup,
274	* NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
275	*
276	* NCR5380_dma_write_setup(instance, src, count) - initialize
277	* NCR5380_dma_read_setup(instance, dst, count) - initialize
278	* NCR5380_dma_residual(instance); - residual count
279	*
280	* PSEUDO functions :
281	* NCR5380_pwrite(instance, src, count)
282	* NCR5380_pread(instance, dst, count);
283	*
284	* If nothing specific to this implementation needs doing (ie, with external
285	* hardware), you must also define
286	*
287	* NCR5380_queue_command
288	* NCR5380_reset
289	* NCR5380_abort
290	* NCR5380_proc_info
291	*
292	* to be the global entry points into the specific driver, ie
293	* #define NCR5380_queue_command t128_queue_command.
294	*
295	* If this is not done, the routines will be defined as static functions
296	* with the NCR5380* names and the user must provide a globally
297	* accessible wrapper function.
298	*
299	* The generic driver is initialized by calling NCR5380_init(instance),
300	* after setting the appropriate host specific fields and ID. If the
301	* driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
302	* possible) function may be used. Before the specific driver initialization
303	* code finishes, NCR5380_print_options should be called.
304	*/
305
306	static int do_abort (struct Scsi_Host *host);
307	static void do_reset (struct Scsi_Host *host);
308	static struct Scsi_Host first_instance = NULL((void ) 0);
309	static Scsi_Host_Template the_template = NULL((void ) 0);
310
311	/*
312	* Function : void initialize_SCp(Scsi_Cmnd *cmd)
313	*
314	* Purpose : initialize the saved data pointers for cmd to point to the
315	* start of the buffer.
316	*
317	* Inputs : cmd - Scsi_Cmnd structure to have pointers reset.
318	*/
319
320	static __inline____inline__ __attribute__((always_inline)) void initialize_SCp(Scsi_Cmnd *cmd) {
321	/*
322	* Initialize the Scsi Pointer field so that all of the commands in the
323	* various queues are valid.
324	*/
325
326	if (cmd->use_sg) {
327	cmd->SCp.buffer = (struct scatterlist *) cmd->buffer;
328	cmd->SCp.buffers_residual = cmd->use_sg - 1;
329	cmd->SCp.ptr = (char *) cmd->SCp.buffer->address;
330	cmd->SCp.this_residual = cmd->SCp.buffer->length;
331	} else {
332	cmd->SCp.buffer = NULL((void *) 0);
333	cmd->SCp.buffers_residual = 0;
334	cmd->SCp.ptr = (char *) cmd->request_buffer;
335	cmd->SCp.this_residual = cmd->request_bufflen;
336	}
337	}
338
339	#include <linux/delay.h>
340
341	#ifdef NDEBUG(0x40000 \| NDEBUG_ABORT)
342	static struct {
343	unsigned char mask;
344	const char * name;}
345	signals[] = {{ SR_DBP0x01, "PARITY"}, { SR_RST0x80, "RST" }, { SR_BSY0x40, "BSY" },
346	{ SR_REQ0x20, "REQ" }, { SR_MSG0x10, "MSG" }, { SR_CD0x08, "CD" }, { SR_IO0x04, "IO" },
347	{ SR_SEL0x02, "SEL" }, {0, NULL((void *) 0)}},
348	basrs[] = {{BASR_ATN0x02, "ATN"}, {BASR_ACK0x01, "ACK"}, {0, NULL((void *) 0)}},
349	icrs[] = {{ICR_ASSERT_RST0x80, "ASSERT RST"},{ICR_ASSERT_ACK0x10, "ASSERT ACK"},
350	{ICR_ASSERT_BSY0x08, "ASSERT BSY"}, {ICR_ASSERT_SEL0x04, "ASSERT SEL"},
351	{ICR_ASSERT_ATN0x02, "ASSERT ATN"}, {ICR_ASSERT_DATA0x01, "ASSERT DATA"},
352	{0, NULL((void *) 0)}},
353	mrs[] = {{MR_BLOCK_DMA_MODE0x80, "MODE BLOCK DMA"}, {MR_TARGET0x40, "MODE TARGET"},
354	{MR_ENABLE_PAR_CHECK0x20, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR0x10,
355	"MODE PARITY INTR"}, {MR_MONITOR_BSY0x04, "MODE MONITOR BSY"},
356	{MR_DMA_MODE0x02, "MODE DMA"}, {MR_ARBITRATE0x01, "MODE ARBITRATION"},
357	{0, NULL((void *) 0)}};
358
359	/*
360	* Function : void NCR5380_print(struct Scsi_Host *instance)
361	*
362	* Purpose : print the SCSI bus signals for debugging purposes
363	*
364	* Input : instance - which NCR5380
365	*/
366
367	static void NCR5380_print(struct Scsi_Host *instance) {
368	NCR5380_local_declare()volatile unsigned char *base;
369	unsigned char status, data, basr, mr, icr, i;
370	NCR5380_setup(instance)base = (volatile unsigned char *) (instance)->base;
371	cli()__asm__ __volatile__ ("cli": : :"memory");
372	data = NCR5380_read(CURRENT_SCSI_DATA_REG)(*((base + 0x3880 + 0)));
	Value stored to 'data' is never read
373	status = NCR5380_read(STATUS_REG)(*((base + 0x3880 + 4)));
374	mr = NCR5380_read(MODE_REG)(*((base + 0x3880 + 2)));
375	icr = NCR5380_read(INITIATOR_COMMAND_REG)(*((base + 0x3880 + 1)));
376	basr = NCR5380_read(BUS_AND_STATUS_REG)(*((base + 0x3880 + 5)));
377	sti()__asm__ __volatile__ ("sti": : :"memory");
378	printk("STATUS_REG: %02x ", status);
379	for (i = 0; signals[i].mask ; ++i)
380	if (status & signals[i].mask)
381	printk(",%s", signals[i].name);
382	printk("\nBASR: %02x ", basr);
383	for (i = 0; basrs[i].mask ; ++i)
384	if (basr & basrs[i].mask)
385	printk(",%s", basrs[i].name);
386	printk("\nICR: %02x ", icr);
387	for (i = 0; icrs[i].mask; ++i)
388	if (icr & icrs[i].mask)
389	printk(",%s", icrs[i].name);
390	printk("\nMODE: %02x ", mr);
391	for (i = 0; mrs[i].mask; ++i)
392	if (mr & mrs[i].mask)
393	printk(",%s", mrs[i].name);
394	printk("\n");
395	}
396
397	static struct {
398	unsigned char value;
399	const char *name;
400	} phases[] = {
401	{PHASE_DATAOUT0, "DATAOUT"}, {PHASE_DATAIN0x04, "DATAIN"}, {PHASE_CMDOUT0x08, "CMDOUT"},
402	{PHASE_STATIN(0x08 \| 0x04), "STATIN"}, {PHASE_MSGOUT(0x10 \| 0x08), "MSGOUT"}, {PHASE_MSGIN(0x10 \| 0x08 \| 0x04), "MSGIN"},
403	{PHASE_UNKNOWN0xff, "UNKNOWN"}};
404
405	/*
406	* Function : void NCR5380_print_phase(struct Scsi_Host *instance)
407	*
408	* Purpose : print the current SCSI phase for debugging purposes
409	*
410	* Input : instance - which NCR5380
411	*/
412
413	static void NCR5380_print_phase(struct Scsi_Host *instance) {
414	NCR5380_local_declare()volatile unsigned char *base;
415	unsigned char status;
416	int i;
417	NCR5380_setup(instance)base = (volatile unsigned char *) (instance)->base;
418
419	status = NCR5380_read(STATUS_REG)(*((base + 0x3880 + 4)));
420	if (!(status & SR_REQ0x20))
421	printk("scsi%d : REQ not asserted, phase unknown.\n",
422	instance->host_no);
423	else {
424	for (i = 0; (phases[i].value != PHASE_UNKNOWN0xff) &&
425	(phases[i].value != (status & PHASE_MASK(0x10 \| 0x08 \| 0x04))); ++i);
426	printk("scsi%d : phase %s\n", instance->host_no, phases[i].name);
427	}
428	}
429	#endif
430
431	/*
432	* We need to have our coroutine active given these constraints :
433	* 1. The mutex flag, main_running, can only be set when the main
434	* routine can actually process data, otherwise SCSI commands
435	* will never get issued.
436	*
437	* 2. NCR5380_main() shouldn't be called before it has exited, because
438	* other drivers have had kernel stack overflows in similar
439	* situations.
440	*
441	* 3. We don't want to inline NCR5380_main() because of space concerns,
442	* even though it is only called in two places.
443	*
444	* So, the solution is to set the mutex in an inline wrapper for the
445	* main coroutine, and have the main coroutine exit with interrupts
446	* disabled after the final search through the queues so that no race
447	* conditions are possible.
448	*/
449
450	static volatile int main_running = 0;
451
452	/*
453	* Function : run_main(void)
454	*
455	* Purpose : insure that the coroutine is running and will process our
456	* request. main_running is checked/set here (in an inline function)
457	* rather than in NCR5380_main itself to reduce the chances of stack
458	* overflow.
459	*
460	*/
461
462	static __inline____inline__ __attribute__((always_inline)) void run_main(void) {
463	cli()__asm__ __volatile__ ("cli": : :"memory");
464	if (!main_running) {
465	main_running = 1;
466	NCR5380_main();
467	/*
468	* main_running is cleared in NCR5380_main once it can't do
469	* more work, and NCR5380_main exits with interrupts disabled.
470	*/
471	sti()__asm__ __volatile__ ("sti": : :"memory");
472	} else
473	sti()__asm__ __volatile__ ("sti": : :"memory");
474	}
475
476	#ifdef USLEEP
477	#ifndef NCR5380_TIMER
478	#error "NCR5380_TIMER must be defined so that this type of NCR5380 driver gets a unique timer."
479	#endif
480
481	/*
482	* These need tweaking, and would probably work best as per-device
483	* flags initialized differently for disk, tape, cd, etc devices.
484	* People with broken devices are free to experiment as to what gives
485	* the best results for them.
486	*
487	* USLEEP_SLEEP should be a minimum seek time.
488	*
489	* USLEEP_POLL should be a maximum rotational latency.
490	*/
491	#ifndef USLEEP_SLEEP
492	/* 20 ms (reasonable hard disk speed) */
493	#define USLEEP_SLEEP (20*HZ100/1000)
494	#endif
495	/* 300 RPM (floppy speed) */
496	#ifndef USLEEP_POLL
497	#define USLEEP_POLL (200*HZ100/1000)
498	#endif
499
500	static struct Scsi_Host * expires_first = NULL((void *) 0);
501
502	/*
503	* Function : int should_disconnect (unsigned char cmd)
504	*
505	* Purpose : decide weather a command would normally disconnect or
506	* not, since if it won't disconnect we should go to sleep.
507	*
508	* Input : cmd - opcode of SCSI command
509	*
510	* Returns : DISCONNECT_LONG if we should disconnect for a really long
511	* time (ie always, sleep, look for REQ active, sleep),
512	* DISCONNECT_TIME_TO_DATA if we would only disconnect for a normal
513	* time-to-data delay, DISCONNECT_NONE if this command would return
514	* immediately.
515	*
516	* Future sleep algorithms based on time to data can exploit
517	* something like this so they can differentiate between "normal"
518	* (ie, read, write, seek) and unusual commands (ie, * format).
519	*
520	* Note : We don't deal with commands that handle an immediate disconnect,
521	*
522	*/
523
524	static int should_disconnect (unsigned char cmd) {
525	switch (cmd) {
526	case READ_60x08:
527	case WRITE_60x0a:
528	case SEEK_60x0b:
529	case READ_100x28:
530	case WRITE_100x2a:
531	case SEEK_100x2b:
532	return DISCONNECT_TIME_TO_DATA1;
533	case FORMAT_UNIT0x04:
534	case SEARCH_HIGH0x30:
535	case SEARCH_LOW0x32:
536	case SEARCH_EQUAL0x31:
537	return DISCONNECT_LONG2;
538	default:
539	return DISCONNECT_NONE0;
540	}
541	}
542
543	/*
544	* Assumes instance->time_expires has been set in higher level code.
545	*/
546
547	static int NCR5380_set_timer (struct Scsi_Host *instance) {
548	struct Scsi_Host tmp, *prev;
549
550	cli()__asm__ __volatile__ ("cli": : :"memory");
551	if (((struct NCR5380_hostdata *) (instance->host_data))->next_timer) {
552	sti()__asm__ __volatile__ ("sti": : :"memory");
553	return -1;
554	}
555
556	for (prev = &expires_first, tmp = expires_first; tmp;
557	prev = &(((struct NCR5380_hostdata *) tmp->host_data)->next_timer),
558	tmp = ((struct NCR5380_hostdata *) tmp->host_data)->next_timer)
559	if (instance->time_expires < tmp->time_expires)
560	break;
561
562	instance->next_timer = tmp;
563	*prev = instance;
564	timer_table[NCR5380_TIMER].expires = expires_first->time_expires;
565	timer_active \|= 1 << NCR5380_TIMER;
566	sti()__asm__ __volatile__ ("sti": : :"memory");
567	return 0;
568	}
569
570	/* Doing something about unwanted reentrancy here might be useful */
571	void NCR5380_timer_fn(void) {
572	struct Scsi_Host *instance;
573	cli()__asm__ __volatile__ ("cli": : :"memory");
574	for (; expires_first && expires_first->time_expires >= jiffies; ) {
575	instance = ((NCR5380_hostdata *) expires_first->host_data)->
576	expires_next;
577	((NCR5380_hostdata *) expires_first->host_data)->expires_next =
578	NULL((void *) 0);
579	((NCR5380_hostdata *) expires_first->host_data)->time_expires =
580	0;
581	expires_first = instance;
582	}
583
584	if (expires_first) {
585	timer_table[NCR5380_TIMER].expires = ((NCR5380_hostdata *)
586	expires_first->host_data)->time_expires;
587	timer_active \|= (1 << NCR5380_TIMER);
588	} else {
589	timer_table[NCR5380_TIMER].expires = 0;
590	timer_active &= ~(1 << MCR5380_TIMER);
591	}
592	sti()__asm__ __volatile__ ("sti": : :"memory");
593
594	run_main();
595	}
596	#endif /* def USLEEP */
597
598	static void NCR5380_all_init (void) {
599	static int done = 0;
600	if (!done) {
601	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_INIT0x20)
602	printk("scsi : NCR5380_all_init()\n");
603	#endif
604	done = 1;
605	#ifdef USLEEP
606	timer_table[NCR5380_TIMER].expires = 0;
607	timer_table[NCR5380_TIMER].fn = NCR5380_timer_fn;
608	#endif
609	}
610	}
611
612	#ifdef AUTOPROBE_IRQ
613	/*
614	* Function : int NCR5380_probe_irq (struct Scsi_Host *instance, int possible)
615	*
616	* Purpose : autoprobe for the IRQ line used by the NCR5380.
617	*
618	* Inputs : instance - pointer to this instance of the NCR5380 driver,
619	* possible - bitmask of permissible interrupts.
620	*
621	* Returns : number of the IRQ selected, IRQ_NONE if no interrupt fired.
622	*
623	* XXX no effort is made to deal with spurious interrupts.
624	*/
625
626
627	static int probe_irq;
628	static void probe_intr (int irq, void dev_id, struct pt_regs regs) {
629	probe_irq = irq;
630	};
631
632	static int NCR5380_probe_irq (struct Scsi_Host *instance, int possible) {
633	NCR5380_local_declare()volatile unsigned char *base;
634	struct NCR5380_hostdata hostdata = (struct NCR5380_hostdata )
635	instance->hostdata;
636	unsigned long timeout;
637	int trying_irqs, i, mask;
638	NCR5380_setup(instance)base = (volatile unsigned char *) (instance)->base;
639
640	for (trying_irqs = i = 0, mask = 1; i < 16; ++i, mask <<= 1)
641	if ((mask & possible) && (request_irq(i, &probe_intr, SA_INTERRUPT0x20000000, "NCR-probe", NULL((void *) 0))
642	== 0))
643	trying_irqs \|= mask;
644
645	timeout = jiffies + 250*HZ100/1000;
646	probe_irq = IRQ_NONE255;
647
648	/*
649	* A interrupt is triggered whenever BSY = false, SEL = true
650	* and a bit set in the SELECT_ENABLE_REG is asserted on the
651	* SCSI bus.
652	*
653	* Note that the bus is only driven when the phase control signals
654	* (I/O, C/D, and MSG) match those in the TCR, so we must reset that
655	* to zero.
656	*/
657
658	NCR5380_write(TARGET_COMMAND_REG, 0)(*((base + 0x3880 + 3)) = (0));
659	NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask)(*((base + 0x3880 + 4)) = (hostdata->id_mask));
660	NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask)(*((base + 0x3880 + 0)) = (hostdata->id_mask));
661	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE \| ICR_ASSERT_DATA \|(*((base + 0x3880 + 1)) = (0 \| 0x01 \| 0x04))
662	ICR_ASSERT_SEL)(*((base + 0x3880 + 1)) = (0 \| 0x01 \| 0x04));
663
664	while (probe_irq == IRQ_NONE255 && jiffies < timeout)
665	barrier()__asm__ __volatile__("": : :"memory");
666
667	NCR5380_write(SELECT_ENABLE_REG, 0)(*((base + 0x3880 + 4)) = (0));
668	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE)(*((base + 0x3880 + 1)) = (0));
669
670	for (i = 0, mask = 1; i < 16; ++i, mask <<= 1)
671	if (trying_irqs & mask)
672	free_irq(i, NULL((void *) 0));
673
674	return probe_irq;
675	}
676	#endif /* AUTOPROBE_IRQ */
677
678	/*
679	* Function : void NCR58380_print_options (struct Scsi_Host *instance)
680	*
681	* Purpose : called by probe code indicating the NCR5380 driver
682	* options that were selected.
683	*
684	* Inputs : instance, pointer to this instance. Unused.
685	*/
686
687	static void NCR5380_print_options (struct Scsi_Host *instance) {
688	printk(" generic options"
689	#ifdef AUTOPROBE_IRQ
690	" AUTOPROBE_IRQ"
691	#endif
692	#ifdef AUTOSENSE
693	" AUTOSENSE"
694	#endif
695	#ifdef DIFFERENTIAL
696	" DIFFERENTIAL"
697	#endif
698	#ifdef REAL_DMA
699	" REAL DMA"
700	#endif
701	#ifdef REAL_DMA_POLL
702	" REAL DMA POLL"
703	#endif
704	#ifdef PARITY
705	" PARITY"
706	#endif
707	#ifdef PSEUDO_DMA
708	" PSEUDO DMA"
709	#endif
710	#ifdef SCSI2
711	" SCSI-2"
712	#endif
713	#ifdef UNSAFE
714	" UNSAFE "
715	#endif
716	);
717	#ifdef USLEEP
718	printk(" USLEEP, USLEEP_POLL=%d USLEEP_SLEEP=%d", USLEEP_POLL, USLEEP_SLEEP);
719	#endif
720	printk(" generic release=%d", NCR5380_PUBLIC_RELEASE7);
721	if (((struct NCR5380_hostdata *)instance->hostdata)->flags & FLAG_NCR53C4004) {
722	printk(" ncr53c400 release=%d", NCR53C400_PUBLIC_RELEASE2);
723	}
724	}
725
726	/*
727	* Function : void NCR5380_print_status (struct Scsi_Host *instance)
728	*
729	* Purpose : print commands in the various queues, called from
730	* NCR5380_abort and NCR5380_debug to aid debugging.
731	*
732	* Inputs : instance, pointer to this instance.
733	*/
734
735	static void NCR5380_print_status (struct Scsi_Host *instance) {
736	static char pr_bfr[512];
737	char *start;
738	int len;
739
740	printk("NCR5380 : coroutine is%s running.\n",
741	main_running ? "" : "n't");
742
743	#ifdef NDEBUG(0x40000 \| NDEBUG_ABORT)
744	NCR5380_print (instance);
745	NCR5380_print_phase (instance);
746	#endif
747
748	len = NCR5380_proc_infodtc_proc_info(pr_bfr, &start, 0, sizeof(pr_bfr),
749	instance->host_no, 0);
750	pr_bfr[len] = 0;
751	printk("\n%s\n", pr_bfr);
752	}
753
754	/******************************************/
755	/*
756	* /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
757	*
758	* *buffer: I/O buffer
759	* **start: if inout == FALSE pointer into buffer where user read should start
760	* offset: current offset
761	* length: length of buffer
762	* hostno: Scsi_Host host_no
763	* inout: TRUE - user is writing; FALSE - user is reading
764	*
765	* Return the number of bytes read from or written
766	*/
767
768	#undef SPRINTF
769	#define SPRINTF(args...)do { if(pos < buffer + length-80) pos += linux_sprintf(pos ,args...); } while(0) do { if(pos < buffer + length-80) pos += sprintflinux_sprintf(pos, ## args); } while(0)
770	static
771	char lprint_Scsi_Cmnd (Scsi_Cmnd cmd, char pos, char buffer, int length);
772	static
773	char lprint_command (unsigned char cmd, char pos, char buffer, int len);
774	static
775	char lprint_opcode(int opcode, char pos, char *buffer, int length);
776
777	#ifndef NCR5380_proc_infodtc_proc_info
778	static
779	#endif
780	int NCR5380_proc_infodtc_proc_info (
781	char buffer, char *start,off_t offset,
782	int length,int hostno,int inout)
783	{
784	char *pos = buffer;
785	struct Scsi_Host *instance;
786	struct NCR5380_hostdata *hostdata;
787	Scsi_Cmnd *ptr;
788
789	for (instance = first_instance; instance &&
790	instance->host_no != hostno; instance=instance->next)
791	;
792	if (!instance)
793	return(-ESRCH3);
794	hostdata = (struct NCR5380_hostdata *)instance->hostdata;
795
796	if (inout) { /* Has data been written to the file ? */
797	#ifdef DTC_PUBLIC_RELEASE1
798	dtc_wmaxi = dtc_maxi = 0;
799	#endif
800	#ifdef PAS16_PUBLIC_RELEASE
801	pas_wmaxi = pas_maxi = 0;
802	#endif
803	return(-ENOSYS38); /* Currently this is a no-op */
804	}
805	SPRINTF("NCR5380 core release=%d. ", NCR5380_PUBLIC_RELEASE)do { if(pos < buffer + length-80) pos += linux_sprintf(pos ,"NCR5380 core release=%d. ", 7); } while(0);
806	if (((struct NCR5380_hostdata *)instance->hostdata)->flags & FLAG_NCR53C4004)
807	SPRINTF("ncr53c400 release=%d. ", NCR53C400_PUBLIC_RELEASE)do { if(pos < buffer + length-80) pos += linux_sprintf(pos ,"ncr53c400 release=%d. ", 2); } while(0);
808	#ifdef DTC_PUBLIC_RELEASE1
809	SPRINTF("DTC 3180/3280 release %d", DTC_PUBLIC_RELEASE)do { if(pos < buffer + length-80) pos += linux_sprintf(pos ,"DTC 3180/3280 release %d", 1); } while(0);
810	#endif
811	#ifdef T128_PUBLIC_RELEASE
812	SPRINTF("T128 release %d", T128_PUBLIC_RELEASE)do { if(pos < buffer + length-80) pos += linux_sprintf(pos ,"T128 release %d", T128_PUBLIC_RELEASE); } while(0);
813	#endif
814	#ifdef GENERIC_NCR5380_PUBLIC_RELEASE
815	SPRINTF("Generic5380 release %d", GENERIC_NCR5380_PUBLIC_RELEASE)do { if(pos < buffer + length-80) pos += linux_sprintf(pos ,"Generic5380 release %d", GENERIC_NCR5380_PUBLIC_RELEASE); } while(0);
816	#endif
817	#ifdef PAS16_PUBLIC_RELEASE
818	SPRINTF("PAS16 release=%d", PAS16_PUBLIC_RELEASE)do { if(pos < buffer + length-80) pos += linux_sprintf(pos ,"PAS16 release=%d", PAS16_PUBLIC_RELEASE); } while(0);
819	#endif
820
821	SPRINTF("\nBase Addr: 0x%05lX ", (long)instance->base)do { if(pos < buffer + length-80) pos += linux_sprintf(pos ,"\nBase Addr: 0x%05lX ", (long)instance->base); } while (0);
822	SPRINTF("io_port: %04x ", (int)instance->io_port)do { if(pos < buffer + length-80) pos += linux_sprintf(pos ,"io_port: %04x ", (int)instance->io_port); } while(0 );
823	if (instance->irq == IRQ_NONE255)
824	SPRINTF("IRQ: None.\n")do { if(pos < buffer + length-80) pos += linux_sprintf(pos ,"IRQ: None.\n"); } while(0);
825	else
826	SPRINTF("IRQ: %d.\n", instance->irq)do { if(pos < buffer + length-80) pos += linux_sprintf(pos ,"IRQ: %d.\n", instance->irq); } while(0);
827
828	#ifdef DTC_PUBLIC_RELEASE1
829	SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n",do { if(pos < buffer + length-80) pos += linux_sprintf(pos ,"Highwater I/O busy_spin_counts -- write: %d read: %d\n", dtc_wmaxi , dtc_maxi); } while(0)
830	dtc_wmaxi, dtc_maxi)do { if(pos < buffer + length-80) pos += linux_sprintf(pos ,"Highwater I/O busy_spin_counts -- write: %d read: %d\n", dtc_wmaxi , dtc_maxi); } while(0);
831	#endif
832	#ifdef PAS16_PUBLIC_RELEASE
833	SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n",do { if(pos < buffer + length-80) pos += linux_sprintf(pos ,"Highwater I/O busy_spin_counts -- write: %d read: %d\n", pas_wmaxi , pas_maxi); } while(0)
834	pas_wmaxi, pas_maxi)do { if(pos < buffer + length-80) pos += linux_sprintf(pos ,"Highwater I/O busy_spin_counts -- write: %d read: %d\n", pas_wmaxi , pas_maxi); } while(0);
835	#endif
836	cli()__asm__ __volatile__ ("cli": : :"memory");
837	SPRINTF("NCR5380 : coroutine is%s running.\n", main_running ? "" : "n't")do { if(pos < buffer + length-80) pos += linux_sprintf(pos ,"NCR5380 : coroutine is%s running.\n", main_running ? "" : "n't" ); } while(0);
838	if (!hostdata->connected)
839	SPRINTF("scsi%d: no currently connected command\n", instance->host_no)do { if(pos < buffer + length-80) pos += linux_sprintf(pos ,"scsi%d: no currently connected command\n", instance->host_no ); } while(0);
840	else
841	pos = lprint_Scsi_Cmnd ((Scsi_Cmnd *) hostdata->connected,
842	pos, buffer, length);
843	SPRINTF("scsi%d: issue_queue\n", instance->host_no)do { if(pos < buffer + length-80) pos += linux_sprintf(pos ,"scsi%d: issue_queue\n", instance->host_no); } while(0);
844	for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr;
845	ptr = (Scsi_Cmnd *) ptr->host_scribble)
846	pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
847
848	SPRINTF("scsi%d: disconnected_queue\n", instance->host_no)do { if(pos < buffer + length-80) pos += linux_sprintf(pos ,"scsi%d: disconnected_queue\n", instance->host_no); } while (0);
849	for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr;
850	ptr = (Scsi_Cmnd *) ptr->host_scribble)
851	pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
852
853	sti()__asm__ __volatile__ ("sti": : :"memory");
854	*start=buffer;
855	if (pos - buffer < offset)
856	return 0;
857	else if (pos - buffer - offset < length)
858	return pos - buffer - offset;
859	return length;
860	}
861
862	static
863	char lprint_Scsi_Cmnd (Scsi_Cmnd cmd, char pos, char buffer, int length) {
864	SPRINTF("scsi%d : destination target %d, lun %d\n",do { if(pos < buffer + length-80) pos += linux_sprintf(pos ,"scsi%d : destination target %d, lun %d\n", cmd->host-> host_no, cmd->target, cmd->lun); } while(0)
865	cmd->host->host_no, cmd->target, cmd->lun)do { if(pos < buffer + length-80) pos += linux_sprintf(pos ,"scsi%d : destination target %d, lun %d\n", cmd->host-> host_no, cmd->target, cmd->lun); } while(0);
866	SPRINTF(" command = ")do { if(pos < buffer + length-80) pos += linux_sprintf(pos ," command = "); } while(0);
867	pos = lprint_command (cmd->cmnd, pos, buffer, length);
868	return (pos);
869	}
870
871	static
872	char lprint_command (unsigned char command,
873	char pos, char buffer, int length) {
874	int i, s;
875	pos = lprint_opcode(command[0], pos, buffer, length);
876	for ( i = 1, s = COMMAND_SIZE(command[0])scsi_command_size[((command[0]) >> 5) & 7]; i < s; ++i)
877	SPRINTF("%02x ", command[i])do { if(pos < buffer + length-80) pos += linux_sprintf(pos ,"%02x ", command[i]); } while(0);
878	SPRINTF("\n")do { if(pos < buffer + length-80) pos += linux_sprintf(pos ,"\n"); } while(0);
879	return(pos);
880	}
881
882	static
883	char lprint_opcode(int opcode, char pos, char *buffer, int length) {
884	SPRINTF("%2d (0x%02x)", opcode, opcode)do { if(pos < buffer + length-80) pos += linux_sprintf(pos ,"%2d (0x%02x)", opcode, opcode); } while(0);
885	return(pos);
886	}
887
888
889	/*
890	* Function : void NCR5380_init (struct Scsi_Host *instance, flags)
891	*
892	* Purpose : initializes *instance and corresponding 5380 chip,
893	* with flags OR'd into the initial flags value.
894	*
895	* Inputs : instance - instantiation of the 5380 driver.
896	*
897	* Notes : I assume that the host, hostno, and id bits have been
898	* set correctly. I don't care about the irq and other fields.
899	*
900	*/
901
902	static void NCR5380_init (struct Scsi_Host *instance, int flags) {
903	NCR5380_local_declare()volatile unsigned char *base;
904	int i, pass;
905	unsigned long timeout;
906	struct NCR5380_hostdata hostdata = (struct NCR5380_hostdata )
907	instance->hostdata;
908
909	/*
910	* On NCR53C400 boards, NCR5380 registers are mapped 8 past
911	* the base address.
912	*/
913
914	#ifdef NCR53C400
915	if (flags & FLAG_NCR53C4004)
916	instance->NCR5380_instance_name += NCR53C400_address_adjust;
917	#endif
918
919	NCR5380_setup(instance)base = (volatile unsigned char *) (instance)->base;
920
921	NCR5380_all_init();
922
923	hostdata->aborted = 0;
924	hostdata->id_mask = 1 << instance->this_id;
925	for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
926	if (i > hostdata->id_mask)
927	hostdata->id_higher_mask \|= i;
928	for (i = 0; i < 8; ++i)
929	hostdata->busy[i] = 0;
930	#ifdef REAL_DMA
931	hostdata->dmalen = 0;
932	#endif
933	hostdata->targets_present = 0;
934	hostdata->connected = NULL((void *) 0);
935	hostdata->issue_queue = NULL((void *) 0);
936	hostdata->disconnected_queue = NULL((void *) 0);
937	#ifdef NCR5380_STATS
938	for (i = 0; i < 8; ++i) {
939	hostdata->time_read[i] = 0;
940	hostdata->time_write[i] = 0;
941	hostdata->bytes_read[i] = 0;
942	hostdata->bytes_write[i] = 0;
943	}
944	hostdata->timebase = 0;
945	hostdata->pendingw = 0;
946	hostdata->pendingr = 0;
947	#endif
948
949	/* The CHECK code seems to break the 53C400. Will check it later maybe */
950	if (flags & FLAG_NCR53C4004)
951	hostdata->flags = FLAG_HAS_LAST_BYTE_SENT1 \| flags;
952	else
953	hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT2 \| flags;
954
955	if (!the_template) {
956	the_template = instance->hostt;
957	first_instance = instance;
958	}
959
960
961	#ifdef USLEEP
962	hostdata->time_expires = 0;
963	hostdata->next_timer = NULL((void *) 0);
964	#endif
965
966	#ifndef AUTOSENSE
967	if ((instance->cmd_per_lun > 1) \|\| instance->can_queue > 1))
968	printk("scsi%d : WARNING : support for multiple outstanding commands enabled\n"
969	" without AUTOSENSE option, contingent allegiance conditions may\n"
970	" be incorrectly cleared.\n", instance->host_no);
971	#endif /* def AUTOSENSE */
972
973	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE)(*((base + 0x3880 + 1)) = (0));
974	NCR5380_write(MODE_REG, MR_BASE)(*((base + 0x3880 + 2)) = (0));
975	NCR5380_write(TARGET_COMMAND_REG, 0)(*((base + 0x3880 + 3)) = (0));
976	NCR5380_write(SELECT_ENABLE_REG, 0)(*((base + 0x3880 + 4)) = (0));
977
978	#ifdef NCR53C400
979	if (hostdata->flags & FLAG_NCR53C4004) {
980	NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE)(*((base + 0x3880 + NCR53C400_register_offset-8)) = (0x10));
981	}
982	#endif
983
984	/*
985	* Detect and correct bus wedge problems.
986	*
987	* If the system crashed, it may have crashed in a state
988	* where a SCSI command was still executing, and the
989	* SCSI bus is not in a BUS FREE STATE.
990	*
991	* If this is the case, we'll try to abort the currently
992	* established nexus which we know nothing about, and that
993	* failing, do a hard reset of the SCSI bus
994	*/
995
996	for (pass = 1; (NCR5380_read(STATUS_REG)(*((base + 0x3880 + 4))) & SR_BSY0x40) &&
997	pass <= 6 ; ++pass) {
998	switch (pass) {
999	case 1:
1000	case 3:
1001	case 5:
1002	printk("scsi%d: SCSI bus busy, waiting up to five seconds\n",
1003	instance->host_no);
1004	timeout = jiffies + 5*HZ100;
1005	while (jiffies < timeout && (NCR5380_read(STATUS_REG)(*((base + 0x3880 + 4))) & SR_BSY0x40));
1006	break;
1007	case 2:
1008	printk("scsi%d: bus busy, attempting abort\n",
1009	instance->host_no);
1010	do_abort (instance);
1011	break;
1012	case 4:
1013	printk("scsi%d: bus busy, attempting reset\n",
1014	instance->host_no);
1015	do_reset (instance);
1016	break;
1017	case 6:
1018	printk("scsi%d: bus locked solid or invalid override\n",
1019	instance->host_no);
1020	}
1021	}
1022	}
1023
1024	/*
1025	* Function : int NCR5380_queue_command (Scsi_Cmnd *cmd,
1026	* void (done)(Scsi_Cmnd ))
1027	*
1028	* Purpose : enqueues a SCSI command
1029	*
1030	* Inputs : cmd - SCSI command, done - function called on completion, with
1031	* a pointer to the command descriptor.
1032	*
1033	* Returns : 0
1034	*
1035	* Side effects :
1036	* cmd is added to the per instance issue_queue, with minor
1037	* twiddling done to the host specific fields of cmd. If the
1038	* main coroutine is not running, it is restarted.
1039	*
1040	*/
1041
1042	/* Only make static if a wrapper function is used */
1043	#ifndef NCR5380_queue_commanddtc_queue_command
1044	static
1045	#endif
1046	int NCR5380_queue_commanddtc_queue_command (Scsi_Cmnd cmd, void (done)(Scsi_Cmnd *)) {
1047	struct Scsi_Host *instance = cmd->host;
1048	struct NCR5380_hostdata hostdata = (struct NCR5380_hostdata )
1049	instance->hostdata;
1050	Scsi_Cmnd *tmp;
1051
1052	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_NO_WRITE0x400)
1053	switch (cmd->cmnd[0]) {
1054	case WRITE_60x0a:
1055	case WRITE_100x2a:
1056	printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n",
1057	instance->host_no);
1058	cmd->result = (DID_ERROR0x07 << 16);
1059	done(cmd);
1060	return 0;
1061	}
1062	#endif /* (NDEBUG & NDEBUG_NO_WRITE) */
1063
1064	#ifdef NCR5380_STATS
1065	# if 0
1066	if (!hostdata->connected && !hostdata->issue_queue &&
1067	!hostdata->disconnected_queue) {
1068	hostdata->timebase = jiffies;
1069	}
1070	# endif
1071	# ifdef NCR5380_STAT_LIMIT
1072	if (cmd->request_bufflen > NCR5380_STAT_LIMIT)
1073	# endif
1074	switch (cmd->cmnd[0])
1075	{
1076	case WRITE1:
1077	case WRITE_60x0a:
1078	case WRITE_100x2a:
1079	hostdata->time_write[cmd->target] -= (jiffies - hostdata->timebase);
1080	hostdata->bytes_write[cmd->target] += cmd->request_bufflen;
1081	hostdata->pendingw++;
1082	break;
1083	case READ0:
1084	case READ_60x08:
1085	case READ_100x28:
1086	hostdata->time_read[cmd->target] -= (jiffies - hostdata->timebase);
1087	hostdata->bytes_read[cmd->target] += cmd->request_bufflen;
1088	hostdata->pendingr++;
1089	break;
1090	}
1091	#endif
1092
1093	/*
1094	* We use the host_scribble field as a pointer to the next command
1095	* in a queue
1096	*/
1097
1098	cmd->host_scribble = NULL((void *) 0);
1099	cmd->scsi_done = done;
1100
1101	cmd->result = 0;
1102
1103
1104	/*
1105	* Insert the cmd into the issue queue. Note that REQUEST SENSE
1106	* commands are added to the head of the queue since any command will
1107	* clear the contingent allegiance condition that exists and the
1108	* sense data is only guaranteed to be valid while the condition exists.
1109	*/
1110
1111	cli()__asm__ __volatile__ ("cli": : :"memory");
1112	if (!(hostdata->issue_queue) \|\| (cmd->cmnd[0] == REQUEST_SENSE0x03)) {
1113	LIST(cmd, hostdata->issue_queue);
1114	cmd->host_scribble = (unsigned char *) hostdata->issue_queue;
1115	hostdata->issue_queue = cmd;
1116	} else {
1117	for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp->host_scribble;
1118	tmp = (Scsi_Cmnd *) tmp->host_scribble);
1119	LIST(cmd, tmp);
1120	tmp->host_scribble = (unsigned char *) cmd;
1121	}
1122	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_QUEUES0x2000)
1123	printk("scsi%d : command added to %s of queue\n", instance->host_no,
1124	(cmd->cmnd[0] == REQUEST_SENSE0x03) ? "head" : "tail");
1125	#endif
1126
1127	/* Run the coroutine if it isn't already running. */
1128	run_main();
1129	return 0;
1130	}
1131
1132	/*
1133	* Function : NCR5380_main (void)
1134	*
1135	* Purpose : NCR5380_main is a coroutine that runs as long as more work can
1136	* be done on the NCR5380 host adapters in a system. Both
1137	* NCR5380_queue_command() and NCR5380_intr() will try to start it
1138	* in case it is not running.
1139	*
1140	* NOTE : NCR5380_main exits with interrupts disabled, the caller should
1141	* reenable them. This prevents reentrancy and kernel stack overflow.
1142	*/
1143
1144	static void NCR5380_main (void) {
1145	Scsi_Cmnd tmp, prev;
1146	struct Scsi_Host *instance;
1147	struct NCR5380_hostdata *hostdata;
1148	int done;
1149
1150	/*
1151	* We run (with interrupts disabled) until we're sure that none of
1152	* the host adapters have anything that can be done, at which point
1153	* we set main_running to 0 and exit.
1154	*
1155	* Interrupts are enabled before doing various other internal
1156	* instructions, after we've decided that we need to run through
1157	* the loop again.
1158	*
1159	* this should prevent any race conditions.
1160	*/
1161
1162	do {
1163	cli()__asm__ __volatile__ ("cli": : :"memory"); /* Freeze request queues */
1164	done = 1;
1165	for (instance = first_instance; instance &&
1166	instance->hostt == the_template; instance=instance->next) {
1167	hostdata = (struct NCR5380_hostdata *) instance->hostdata;
1168	cli()__asm__ __volatile__ ("cli": : :"memory");
1169	if (!hostdata->connected) {
1170	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_MAIN0x100)
1171	printk("scsi%d : not connected\n", instance->host_no);
1172	#endif
1173	/*
1174	* Search through the issue_queue for a command destined
1175	* for a target that's not busy.
1176	*/
1177	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_LISTS0x400000)
1178	for (tmp= (Scsi_Cmnd ) hostdata->issue_queue, prev=NULL((void ) 0); tmp && (tmp != prev); prev=tmp, tmp=(Scsi_Cmnd*)tmp->host_scribble)
1179	;
1180	/printk("%p ", tmp);/
1181	if ((tmp == prev) && tmp) printk(" LOOP\n");/* else printk("\n");*/
1182	#endif
1183	for (tmp = (Scsi_Cmnd *) hostdata->issue_queue,
1184	prev = NULL((void ) 0); tmp; prev = tmp, tmp = (Scsi_Cmnd )
1185	tmp->host_scribble) {
1186
1187	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_LISTS0x400000)
1188	if (prev != tmp)
1189	printk("MAIN tmp=%p target=%d busy=%d lun=%d\n", tmp, tmp->target, hostdata->busy[tmp->target], tmp->lun);
1190	#endif
1191	/* When we find one, remove it from the issue queue. */
1192	if (!(hostdata->busy[tmp->target] & (1 << tmp->lun))) {
1193	if (prev) {
1194	REMOVE(prev,prev->host_scribble,tmp,tmp->host_scribble);
1195	prev->host_scribble = tmp->host_scribble;
1196	} else {
1197	REMOVE(-1,hostdata->issue_queue,tmp,tmp->host_scribble);
1198	hostdata->issue_queue = (Scsi_Cmnd *) tmp->host_scribble;
1199	}
1200	tmp->host_scribble = NULL((void *) 0);
1201
1202	/* reenable interrupts after finding one */
1203	sti()__asm__ __volatile__ ("sti": : :"memory");
1204
1205	/*
1206	* Attempt to establish an I_T_L nexus here.
1207	* On success, instance->hostdata->connected is set.
1208	* On failure, we must add the command back to the
1209	* issue queue so we can keep trying.
1210	*/
1211	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & (NDEBUG_MAIN0x100 \| NDEBUG_QUEUES0x2000))
1212	printk("scsi%d : main() : command for target %d lun %d removed from issue_queue\n",
1213	instance->host_no, tmp->target, tmp->lun);
1214	#endif
1215
1216	/*
1217	* A successful selection is defined as one that
1218	* leaves us with the command connected and
1219	* in hostdata->connected, OR has terminated the
1220	* command.
1221	*
1222	* With successful commands, we fall through
1223	* and see if we can do an information transfer,
1224	* with failures we will restart.
1225	*/
1226
1227	if (!NCR5380_select(instance, tmp,
1228	/*
1229	* REQUEST SENSE commands are issued without tagged
1230	* queueing, even on SCSI-II devices because the
1231	* contingent allegiance condition exists for the
1232	* entire unit.
1233	*/
1234	(tmp->cmnd[0] == REQUEST_SENSE0x03) ? TAG_NONE-2 :
1235	TAG_NEXT-1)) {
1236	break;
1237	} else {
1238	cli()__asm__ __volatile__ ("cli": : :"memory");
1239	LIST(tmp, hostdata->issue_queue);
1240	tmp->host_scribble = (unsigned char *)
1241	hostdata->issue_queue;
1242	hostdata->issue_queue = tmp;
1243	done = 0;
1244	sti()__asm__ __volatile__ ("sti": : :"memory");
1245	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & (NDEBUG_MAIN0x100 \| NDEBUG_QUEUES0x2000))
1246	printk("scsi%d : main(): select() failed, returned to issue_queue\n",
1247	instance->host_no);
1248	#endif
1249	}
1250	} /* if target/lun is not busy */
1251	} /* for */
1252	} /* if (!hostdata->connected) */
1253
1254	if (hostdata->connected
1255	#ifdef REAL_DMA
1256	&& !hostdata->dmalen
1257	#endif
1258	#ifdef USLEEP
1259	&& (!hostdata->time_expires \|\| hostdata->time_expires >= jiffies)
1260	#endif
1261	) {
1262	sti()__asm__ __volatile__ ("sti": : :"memory");
1263	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_MAIN0x100)
1264	printk("scsi%d : main() : performing information transfer\n",
1265	instance->host_no);
1266	#endif
1267	NCR5380_information_transfer(instance);
1268	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_MAIN0x100)
1269	printk("scsi%d : main() : done set false\n", instance->host_no);
1270	#endif
1271	done = 0;
1272	} else
1273	break;
1274	} /* for instance */
1275	} while (!done);
1276	main_running = 0;
1277	}
1278
1279	#ifndef DONT_USE_INTR
1280	/*
1281	* Function : void NCR5380_intr (int irq)
1282	*
1283	* Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1284	* from the disconnected queue, and restarting NCR5380_main()
1285	* as required.
1286	*
1287	* Inputs : int irq, irq that caused this interrupt.
1288	*
1289	*/
1290
1291	static void NCR5380_intrdtc_intr (int irq, void dev_id, struct pt_regs regs) {
1292	NCR5380_local_declare()volatile unsigned char *base;
1293	struct Scsi_Host *instance;
1294	int done;
1295	unsigned char basr;
1296	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_INTR0x40)
1297	printk("scsi : NCR5380 irq %d triggered\n", irq);
1298	#endif
1299	do {
1300	done = 1;
1301	for (instance = first_instance; instance && (instance->hostt ==
1302	the_template); instance = instance->next)
1303	if (instance->irq == irq) {
1304
1305	/* Look for pending interrupts */
1306	NCR5380_setup(instance)base = (volatile unsigned char *) (instance)->base;
1307	basr = NCR5380_read(BUS_AND_STATUS_REG)(*((base + 0x3880 + 5)));
1308	/* XXX dispatch to appropriate routine if found and done=0 */
1309	if (basr & BASR_IRQ0x10) {
1310	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_INTR0x40)
1311	NCR5380_print(instance);
1312	#endif
1313	if ((NCR5380_read(STATUS_REG)(*((base + 0x3880 + 4))) & (SR_SEL0x02 \| SR_IO0x04)) ==
1314	(SR_SEL0x02 \| SR_IO0x04)) {
1315	done = 0;
1316	sti()__asm__ __volatile__ ("sti": : :"memory");
1317	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_INTR0x40)
1318	printk("scsi%d : SEL interrupt\n", instance->host_no);
1319	#endif
1320	NCR5380_reselect(instance);
1321	(void) NCR5380_read(RESET_PARITY_INTERRUPT_REG)(*((base + 0x3880 + 7)));
1322	} else if (basr & BASR_PARITY_ERROR0x20) {
1323	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_INTR0x40)
1324	printk("scsi%d : PARITY interrupt\n", instance->host_no);
1325	#endif
1326	(void) NCR5380_read(RESET_PARITY_INTERRUPT_REG)(*((base + 0x3880 + 7)));
1327	} else if ((NCR5380_read(STATUS_REG)(*((base + 0x3880 + 4))) & SR_RST0x80) == SR_RST0x80) {
1328	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_INTR0x40)
1329	printk("scsi%d : RESET interrupt\n", instance->host_no);
1330	#endif
1331	(void)NCR5380_read(RESET_PARITY_INTERRUPT_REG)(*((base + 0x3880 + 7)));
1332	} else {
1333	/*
1334	* XXX the rest of the interrupt conditions should only occur during a
1335	* DMA transfer, which I haven't gotten around to fixing yet.
1336	*/
1337
1338	#if defined(REAL_DMA)
1339	/*
1340	* We should only get PHASE MISMATCH and EOP interrupts
1341	* if we have DMA enabled, so do a sanity check based on
1342	* the current setting of the MODE register.
1343	*/
1344
1345	if ((NCR5380_read(MODE_REG)(*((base + 0x3880 + 2))) & MR_DMA) && ((basr &
1346	BASR_END_DMA_TRANSFER0x80) \|\|
1347	!(basr & BASR_PHASE_MATCH0x08))) {
1348	int transfered;
1349
1350	if (!hostdata->connected)
1351	panic("scsi%d : received end of DMA interrupt with no connected cmd\n",
1352	instance->hostno);
1353
1354	transfered = (hostdata->dmalen - NCR5380_dma_residual(instance));
1355	hostdata->connected->SCp.this_residual -= transferred;
1356	hostdata->connected->SCp.ptr += transferred;
1357	hostdata->dmalen = 0;
1358
1359	(void) NCR5380_read(RESET_PARITY_INTERRUPT_REG)(*((base + 0x3880 + 7)));
1360	#if NCR_TIMEOUT
1361	{
1362	unsigned long timeout = jiffies + NCR_TIMEOUT;
1363
1364	while (NCR5380_read(BUS_AND_STATUS_REG)(*((base + 0x3880 + 5))) & BASR_ACK0x01
1365	&& jiffies < timeout)
1366	;
1367	if (jiffies >= timeout)
1368	printk("scsi%d: timeout at NCR5380.c:%d\n",
1369	host->host_no, __LINE__1369);
1370	}
1371	#else /* NCR_TIMEOUT */
1372	while (NCR5380_read(BUS_AND_STATUS_REG)(*((base + 0x3880 + 5))) & BASR_ACK0x01);
1373	#endif
1374
1375	NCR5380_write(MODE_REG, MR_BASE)(*((base + 0x3880 + 2)) = (0));
1376	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE)(*((base + 0x3880 + 1)) = (0));
1377	}
1378	#else
1379	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_INTR0x40)
1380	printk("scsi : unknown interrupt, BASR 0x%X, MR 0x%X, SR 0x%x\n", basr, NCR5380_read(MODE_REG)(((base + 0x3880 + 2))), NCR5380_read(STATUS_REG)(((base + 0x3880 + 4))));
1381	#endif
1382	(void) NCR5380_read(RESET_PARITY_INTERRUPT_REG)(*((base + 0x3880 + 7)));
1383	#endif
1384	}
1385	} /* if BASR_IRQ */
1386	if (!done)
1387	run_main();
1388	} /* if (instance->irq == irq) */
1389	} while (!done);
1390	}
1391	#endif
1392
1393	#ifdef NCR5380_STATS
1394	static void collect_stats(struct NCR5380_hostdata* hostdata, Scsi_Cmnd* cmd)
1395	{
1396	# ifdef NCR5380_STAT_LIMIT
1397	if (cmd->request_bufflen > NCR5380_STAT_LIMIT)
1398	# endif
1399	switch (cmd->cmnd[0])
1400	{
1401	case WRITE1:
1402	case WRITE_60x0a:
1403	case WRITE_100x2a:
1404	hostdata->time_write[cmd->target] += (jiffies - hostdata->timebase);
1405	/hostdata->bytes_write[cmd->target] += cmd->request_bufflen;/
1406	hostdata->pendingw--;
1407	break;
1408	case READ0:
1409	case READ_60x08:
1410	case READ_100x28:
1411	hostdata->time_read[cmd->target] += (jiffies - hostdata->timebase);
1412	/hostdata->bytes_read[cmd->target] += cmd->request_bufflen;/
1413	hostdata->pendingr--;
1414	break;
1415	}
1416	}
1417	#endif
1418
1419	/*
1420	* Function : int NCR5380_select (struct Scsi_Host instance, Scsi_Cmnd cmd,
1421	* int tag);
1422	*
1423	* Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1424	* including ARBITRATION, SELECTION, and initial message out for
1425	* IDENTIFY and queue messages.
1426	*
1427	* Inputs : instance - instantiation of the 5380 driver on which this
1428	* target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1429	* new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
1430	* the command that is presently connected.
1431	*
1432	* Returns : -1 if selection could not execute for some reason,
1433	* 0 if selection succeeded or failed because the target
1434	* did not respond.
1435	*
1436	* Side effects :
1437	* If bus busy, arbitration failed, etc, NCR5380_select() will exit
1438	* with registers as they should have been on entry - ie
1439	* SELECT_ENABLE will be set appropriately, the NCR5380
1440	* will cease to drive any SCSI bus signals.
1441	*
1442	* If successful : I_T_L or I_T_L_Q nexus will be established,
1443	* instance->connected will be set to cmd.
1444	* SELECT interrupt will be disabled.
1445	*
1446	* If failed (no target) : cmd->scsi_done() will be called, and the
1447	* cmd->result host byte set to DID_BAD_TARGET.
1448	*/
1449
1450	static int NCR5380_select (struct Scsi_Host instance, Scsi_Cmnd cmd,
1451	int tag) {
1452	NCR5380_local_declare()volatile unsigned char *base;
1453	struct NCR5380_hostdata hostdata = (struct NCR5380_hostdata)
1454	instance->hostdata;
1455	unsigned char tmp[3], phase;
1456	unsigned char *data;
1457	int len;
1458	unsigned long timeout;
1459	NCR5380_setup(instance)base = (volatile unsigned char *) (instance)->base;
1460
1461	hostdata->restart_select = 0;
1462	#if defined (NDEBUG(0x40000 \| NDEBUG_ABORT)) && (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_ARBITRATION0x1)
1463	NCR5380_print(instance);
1464	printk("scsi%d : starting arbitration, id = %d\n", instance->host_no,
1465	instance->this_id);
1466	#endif
1467	cli()__asm__ __volatile__ ("cli": : :"memory");
1468
1469	/*
1470	* Set the phase bits to 0, otherwise the NCR5380 won't drive the
1471	* data bus during SELECTION.
1472	*/
1473
1474	NCR5380_write(TARGET_COMMAND_REG, 0)(*((base + 0x3880 + 3)) = (0));
1475
1476
1477	/*
1478	* Start arbitration.
1479	*/
1480
1481	NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask)(*((base + 0x3880 + 0)) = (hostdata->id_mask));
1482	NCR5380_write(MODE_REG, MR_ARBITRATE)(*((base + 0x3880 + 2)) = (0x01));
1483
1484	sti()__asm__ __volatile__ ("sti": : :"memory");
1485
1486	/* Wait for arbitration logic to complete */
1487	#if NCR_TIMEOUT
1488	{
1489	unsigned long timeout = jiffies + 2*NCR_TIMEOUT;
1490
1491	while (!(NCR5380_read(INITIATOR_COMMAND_REG)(*((base + 0x3880 + 1))) & ICR_ARBITRATION_PROGRESS0x40)
1492	&& jiffies < timeout)
1493	;
1494	if (jiffies >= timeout)
1495	{
1496	printk("scsi: arbitration timeout at %d\n", __LINE__1496);
1497	NCR5380_write(MODE_REG, MR_BASE)(*((base + 0x3880 + 2)) = (0));
1498	NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask)(*((base + 0x3880 + 4)) = (hostdata->id_mask));
1499	return -1;
1500	}
1501	}
1502	#else /* NCR_TIMEOUT */
1503	while (!(NCR5380_read(INITIATOR_COMMAND_REG)(*((base + 0x3880 + 1))) & ICR_ARBITRATION_PROGRESS0x40));
1504	#endif
1505
1506	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_ARBITRATION0x1)
1507	printk("scsi%d : arbitration complete\n", instance->host_no);
1508	/* Avoid GCC 2.4.5 asm needs to many reloads error */
1509	__asm__("nop");
1510	#endif
1511
1512	/*
1513	* The arbitration delay is 2.2us, but this is a minimum and there is
1514	* no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1515	* the integral nature of udelay().
1516	*
1517	*/
1518
1519	udelay(3)(__builtin_constant_p(3) ? __const_udelay((3) * 0x10c6ul) : __udelay (3));
1520
1521	/* Check for lost arbitration */
1522	if ((NCR5380_read(INITIATOR_COMMAND_REG)(*((base + 0x3880 + 1))) & ICR_ARBITRATION_LOST0x20) \|\|
1523	(NCR5380_read(CURRENT_SCSI_DATA_REG)(*((base + 0x3880 + 0))) & hostdata->id_higher_mask) \|\|
1524	(NCR5380_read(INITIATOR_COMMAND_REG)(*((base + 0x3880 + 1))) & ICR_ARBITRATION_LOST0x20)) {
1525	NCR5380_write(MODE_REG, MR_BASE)(*((base + 0x3880 + 2)) = (0));
1526	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_ARBITRATION0x1)
1527	printk("scsi%d : lost arbitration, deasserting MR_ARBITRATE\n",
1528	instance->host_no);
1529	#endif
1530	return -1;
1531	}
1532
1533
1534
1535	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE \| ICR_ASSERT_SEL)(*((base + 0x3880 + 1)) = (0 \| 0x04));
1536
1537	if (NCR5380_read(INITIATOR_COMMAND_REG)(*((base + 0x3880 + 1))) & ICR_ARBITRATION_LOST0x20) {
1538	NCR5380_write(MODE_REG, MR_BASE)(*((base + 0x3880 + 2)) = (0));
1539	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE)(*((base + 0x3880 + 1)) = (0));
1540	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_ARBITRATION0x1)
1541	printk("scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n",
1542	instance->host_no);
1543	#endif
1544	return -1;
1545	}
1546
1547	/*
1548	* Again, bus clear + bus settle time is 1.2us, however, this is
1549	* a minimum so we'll udelay ceil(1.2)
1550	*/
1551
1552	udelay(2)(__builtin_constant_p(2) ? __const_udelay((2) * 0x10c6ul) : __udelay (2));
1553
1554	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_ARBITRATION0x1)
1555	printk("scsi%d : won arbitration\n", instance->host_no);
1556	#endif
1557
1558
1559	/*
1560	* Now that we have won arbitration, start Selection process, asserting
1561	* the host and target ID's on the SCSI bus.
1562	*/
1563
1564	NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask \| (1 << cmd->target)))(*((base + 0x3880 + 0)) = ((hostdata->id_mask \| (1 << cmd->target))));
1565
1566	/*
1567	* Raise ATN while SEL is true before BSY goes false from arbitration,
1568	* since this is the only way to guarantee that we'll get a MESSAGE OUT
1569	* phase immediately after selection.
1570	*/
1571
1572	NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE \| ICR_ASSERT_BSY \|(*((base + 0x3880 + 1)) = ((0 \| 0x08 \| 0x01 \| 0x02 \| 0x04 )))
1573	ICR_ASSERT_DATA \| ICR_ASSERT_ATN \| ICR_ASSERT_SEL ))(*((base + 0x3880 + 1)) = ((0 \| 0x08 \| 0x01 \| 0x02 \| 0x04 )));
1574	NCR5380_write(MODE_REG, MR_BASE)(*((base + 0x3880 + 2)) = (0));
1575
1576	/*
1577	* Reselect interrupts must be turned off prior to the dropping of BSY,
1578	* otherwise we will trigger an interrupt.
1579	*/
1580	NCR5380_write(SELECT_ENABLE_REG, 0)(*((base + 0x3880 + 4)) = (0));
1581
1582	/*
1583	* The initiator shall then wait at least two deskew delays and release
1584	* the BSY signal.
1585	*/
1586	udelay(1)(__builtin_constant_p(1) ? __const_udelay((1) * 0x10c6ul) : __udelay (1)); /* wingel -- wait two bus deskew delay >245ns /
1587
1588	/* Reset BSY */
1589	NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE \| ICR_ASSERT_DATA \|(*((base + 0x3880 + 1)) = ((0 \| 0x01 \| 0x02 \| 0x04)))
1590	ICR_ASSERT_ATN \| ICR_ASSERT_SEL))(*((base + 0x3880 + 1)) = ((0 \| 0x01 \| 0x02 \| 0x04)));
1591
1592	/*
1593	* Something weird happens when we cease to drive BSY - looks
1594	* like the board/chip is letting us do another read before the
1595	* appropriate propagation delay has expired, and we're confusing
1596	* a BSY signal from ourselves as the target's response to SELECTION.
1597	*
1598	* A small delay (the 'C++' frontend breaks the pipeline with an
1599	* unnecessary jump, making it work on my 386-33/Trantor T128, the
1600	* tighter 'C' code breaks and requires this) solves the problem -
1601	* the 1 us delay is arbitrary, and only used because this delay will
1602	* be the same on other platforms and since it works here, it should
1603	* work there.
1604	*
1605	* wingel suggests that this could be due to failing to wait
1606	* one deskew delay.
1607	*/
1608
1609	udelay(1)(__builtin_constant_p(1) ? __const_udelay((1) * 0x10c6ul) : __udelay (1));
1610
1611	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_SELECTION0x8000)
1612	printk("scsi%d : selecting target %d\n", instance->host_no, cmd->target);
1613	#endif
1614
1615	/*
1616	* The SCSI specification calls for a 250 ms timeout for the actual
1617	* selection.
1618	*/
1619
1620	timeout = jiffies + 250*HZ100/1000;
1621
1622	/*
1623	* XXX very interesting - we're seeing a bounce where the BSY we
1624	* asserted is being reflected / still asserted (propagation delay?)
1625	* and it's detecting as true. Sigh.
1626	*/
1627
1628	while ((jiffies < timeout) && !(NCR5380_read(STATUS_REG)(*((base + 0x3880 + 4))) &
1629	(SR_BSY0x40 \| SR_IO0x04)));
1630
1631	if ((NCR5380_read(STATUS_REG)(*((base + 0x3880 + 4))) & (SR_SEL0x02 \| SR_IO0x04)) ==
1632	(SR_SEL0x02 \| SR_IO0x04)) {
1633	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE)(*((base + 0x3880 + 1)) = (0));
1634	NCR5380_reselect(instance);
1635	printk ("scsi%d : reselection after won arbitration?\n",
1636	instance->host_no);
1637	NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask)(*((base + 0x3880 + 4)) = (hostdata->id_mask));
1638	return -1;
1639	}
1640
1641	/*
1642	* No less than two deskew delays after the initiator detects the
1643	* BSY signal is true, it shall release the SEL signal and may
1644	* change the DATA BUS. -wingel
1645	*/
1646
1647	udelay(1)(__builtin_constant_p(1) ? __const_udelay((1) * 0x10c6ul) : __udelay (1));
1648
1649	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE \| ICR_ASSERT_ATN)(*((base + 0x3880 + 1)) = (0 \| 0x02));
1650
1651	if (!(NCR5380_read(STATUS_REG)(*((base + 0x3880 + 4))) & SR_BSY0x40)) {
1652	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE)(*((base + 0x3880 + 1)) = (0));
1653	if (hostdata->targets_present & (1 << cmd->target)) {
1654	printk("scsi%d : weirdness\n", instance->host_no);
1655	if (hostdata->restart_select)
1656	printk("\trestart select\n");
1657	#ifdef NDEBUG(0x40000 \| NDEBUG_ABORT)
1658	NCR5380_print (instance);
1659	#endif
1660	NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask)(*((base + 0x3880 + 4)) = (hostdata->id_mask));
1661	return -1;
1662	}
1663	cmd->result = DID_BAD_TARGET0x04 << 16;
1664	#ifdef NCR5380_STATS
1665	collect_stats(hostdata, cmd);
1666	#endif
1667	cmd->scsi_done(cmd);
1668	NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask)(*((base + 0x3880 + 4)) = (hostdata->id_mask));
1669	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_SELECTION0x8000)
1670	printk("scsi%d : target did not respond within 250ms\n",
1671	instance->host_no);
1672	#endif
1673	NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask)(*((base + 0x3880 + 4)) = (hostdata->id_mask));
1674	return 0;
1675	}
1676
1677	hostdata->targets_present \|= (1 << cmd->target);
1678
1679	/*
1680	* Since we followed the SCSI spec, and raised ATN while SEL
1681	* was true but before BSY was false during selection, the information
1682	* transfer phase should be a MESSAGE OUT phase so that we can send the
1683	* IDENTIFY message.
1684	*
1685	* If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1686	* message (2 bytes) with a tag ID that we increment with every command
1687	* until it wraps back to 0.
1688	*
1689	* XXX - it turns out that there are some broken SCSI-II devices,
1690	* which claim to support tagged queuing but fail when more than
1691	* some number of commands are issued at once.
1692	*/
1693
1694	/* Wait for start of REQ/ACK handshake */
1695	#ifdef NCR_TIMEOUT
1696	{
1697	unsigned long timeout = jiffies + NCR_TIMEOUT;
1698
1699	while (!(NCR5380_read(STATUS_REG)(*((base + 0x3880 + 4))) & SR_REQ0x20) && jiffies < timeout);
1700
1701	if (jiffies >= timeout) {
1702	printk("scsi%d: timeout at NCR5380.c:%d\n", __LINE__1702);
1703	NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask)(*((base + 0x3880 + 4)) = (hostdata->id_mask));
1704	return -1;
1705	}
1706	}
1707	#else /* NCR_TIMEOUT */
1708	while (!(NCR5380_read(STATUS_REG)(*((base + 0x3880 + 4))) & SR_REQ0x20));
1709	#endif /* def NCR_TIMEOUT */
1710
1711	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_SELECTION0x8000)
1712	printk("scsi%d : target %d selected, going into MESSAGE OUT phase.\n",
1713	instance->host_no, cmd->target);
1714	#endif
1715	tmp[0] = IDENTIFY(((instance->irq == IRQ_NONE) ? 0 : 1), cmd->lun)(0x80 \| ((((instance->irq == 255) ? 0 : 1)) ? 0x40 : 0) \| ( (cmd->lun) & 0x07));
1716	#ifdef SCSI2
1717	if (cmd->device->tagged_queue && (tag != TAG_NONE-2)) {
1718	tmp[1] = SIMPLE_QUEUE_TAG0x20;
1719	if (tag == TAG_NEXT-1) {
1720	/* 0 is TAG_NONE, used to imply no tag for this command */
1721	if (cmd->device->current_tag == 0)
1722	cmd->device->current_tag = 1;
1723
1724	cmd->tag = cmd->device->current_tag;
1725	cmd->device->current_tag++;
1726	} else
1727	cmd->tag = (unsigned char) tag;
1728
1729	tmp[2] = cmd->tag;
1730	hostdata->last_message = SIMPLE_QUEUE_TAG0x20;
1731	len = 3;
1732	} else
1733	#endif /* def SCSI2 */
1734	{
1735	len = 1;
1736	cmd->tag=0;
1737	}
1738
1739	/* Send message(s) */
1740	data = tmp;
1741	phase = PHASE_MSGOUT(0x10 \| 0x08);
1742	NCR5380_transfer_pio(instance, &phase, &len, &data);
1743	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_SELECTION0x8000)
1744	printk("scsi%d : nexus established.\n", instance->host_no);
1745	#endif
1746	/* XXX need to handle errors here */
1747	hostdata->connected = cmd;
1748	#ifdef SCSI2
1749	if (!cmd->device->tagged_queue)
1750	#endif
1751	hostdata->busy[cmd->target] \|= (1 << cmd->lun);
1752
1753	initialize_SCp(cmd);
1754
1755
1756	return 0;
1757	}
1758
1759	/*
1760	* Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1761	* unsigned char phase, int count, unsigned char **data)
1762	*
1763	* Purpose : transfers data in given phase using polled I/O
1764	*
1765	* Inputs : instance - instance of driver, *phase - pointer to
1766	* what phase is expected, *count - pointer to number of
1767	* bytes to transfer, **data - pointer to data pointer.
1768	*
1769	* Returns : -1 when different phase is entered without transferring
1770	* maximum number of bytes, 0 if all bytes or transfered or exit
1771	* is in same phase.
1772	*
1773	* Also, phase, count, *data are modified in place.
1774	*
1775	* XXX Note : handling for bus free may be useful.
1776	*/
1777
1778	/*
1779	* Note : this code is not as quick as it could be, however it
1780	* IS 100% reliable, and for the actual data transfer where speed
1781	* counts, we will always do a pseudo DMA or DMA transfer.
1782	*/
1783
1784	static int NCR5380_transfer_pio (struct Scsi_Host *instance,
1785	unsigned char phase, int count, unsigned char **data) {
1786	NCR5380_local_declare()volatile unsigned char *base;
1787	register unsigned char p = *phase, tmp;
1788	register int c = *count;
1789	register unsigned char d = data;
1790	NCR5380_setup(instance)base = (volatile unsigned char *) (instance)->base;
1791
1792	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_PIO0x800)
1793	if (!(p & SR_IO0x04))
1794	printk("scsi%d : pio write %d bytes\n", instance->host_no, c);
1795	else
1796	printk("scsi%d : pio read %d bytes\n", instance->host_no, c);
1797	#endif
1798
1799	/*
1800	* The NCR5380 chip will only drive the SCSI bus when the
1801	* phase specified in the appropriate bits of the TARGET COMMAND
1802	* REGISTER match the STATUS REGISTER
1803	*/
1804
1805	NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p))(*((base + 0x3880 + 3)) = (((p) >> 2)));
1806
1807	do {
1808	/*
1809	* Wait for assertion of REQ, after which the phase bits will be
1810	* valid
1811	*/
1812	while (!((tmp = NCR5380_read(STATUS_REG)(*((base + 0x3880 + 4)))) & SR_REQ0x20));
1813
1814	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_HANDSHAKE0x8)
1815	printk("scsi%d : REQ detected\n", instance->host_no);
1816	#endif
1817
1818	/* Check for phase mismatch */
1819	if ((tmp & PHASE_MASK(0x10 \| 0x08 \| 0x04)) != p) {
1820	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_PIO0x800)
1821	printk("scsi%d : phase mismatch\n", instance->host_no);
1822	NCR5380_print_phase(instance);
1823	#endif
1824	break;
1825	}
1826
1827	/* Do actual transfer from SCSI bus to / from memory */
1828	if (!(p & SR_IO0x04))
1829	NCR5380_write(OUTPUT_DATA_REG, d)(((base + 0x3880 + 0)) = (*d));
1830	else
1831	d = NCR5380_read(CURRENT_SCSI_DATA_REG)(((base + 0x3880 + 0)));
1832
1833	++d;
1834
1835	/*
1836	* The SCSI standard suggests that in MSGOUT phase, the initiator
1837	* should drop ATN on the last byte of the message phase
1838	* after REQ has been asserted for the handshake but before
1839	* the initiator raises ACK.
1840	*/
1841
1842	if (!(p & SR_IO0x04)) {
1843	if (!((p & SR_MSG0x10) && c > 1)) {
1844	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE \|(*((base + 0x3880 + 1)) = (0 \| 0x01))
1845	ICR_ASSERT_DATA)(*((base + 0x3880 + 1)) = (0 \| 0x01));
1846	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_PIO0x800)
1847	NCR5380_print(instance);
1848	#endif
1849	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE \|(*((base + 0x3880 + 1)) = (0 \| 0x01 \| 0x10))
1850	ICR_ASSERT_DATA \| ICR_ASSERT_ACK)(*((base + 0x3880 + 1)) = (0 \| 0x01 \| 0x10));
1851	} else {
1852	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE \|(*((base + 0x3880 + 1)) = (0 \| 0x01 \| 0x02))
1853	ICR_ASSERT_DATA \| ICR_ASSERT_ATN)(*((base + 0x3880 + 1)) = (0 \| 0x01 \| 0x02));
1854	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_PIO0x800)
1855	NCR5380_print(instance);
1856	#endif
1857	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE \|(*((base + 0x3880 + 1)) = (0 \| 0x01 \| 0x02 \| 0x10))
1858	ICR_ASSERT_DATA \| ICR_ASSERT_ATN \| ICR_ASSERT_ACK)(*((base + 0x3880 + 1)) = (0 \| 0x01 \| 0x02 \| 0x10));
1859	}
1860	} else {
1861	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_PIO0x800)
1862	NCR5380_print(instance);
1863	#endif
1864	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE \| ICR_ASSERT_ACK)(*((base + 0x3880 + 1)) = (0 \| 0x10));
1865	}
1866
1867	while (NCR5380_read(STATUS_REG)(*((base + 0x3880 + 4))) & SR_REQ0x20);
1868
1869	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_HANDSHAKE0x8)
1870	printk("scsi%d : req false, handshake complete\n", instance->host_no);
1871	#endif
1872
1873	/*
1874	* We have several special cases to consider during REQ/ACK handshaking :
1875	* 1. We were in MSGOUT phase, and we are on the last byte of the
1876	* message. ATN must be dropped as ACK is dropped.
1877	*
1878	* 2. We are in a MSGIN phase, and we are on the last byte of the
1879	* message. We must exit with ACK asserted, so that the calling
1880	* code may raise ATN before dropping ACK to reject the message.
1881	*
1882	* 3. ACK and ATN are clear and the target may proceed as normal.
1883	*/
1884	if (!(p == PHASE_MSGIN(0x10 \| 0x08 \| 0x04) && c == 1)) {
1885	if (p == PHASE_MSGOUT(0x10 \| 0x08) && c > 1)
1886	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE \| ICR_ASSERT_ATN)(*((base + 0x3880 + 1)) = (0 \| 0x02));
1887	else
1888	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE)(*((base + 0x3880 + 1)) = (0));
1889	}
1890	} while (--c);
1891
1892	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_PIO0x800)
1893	printk("scsi%d : residual %d\n", instance->host_no, c);
1894	#endif
1895
1896	*count = c;
1897	*data = d;
1898	tmp = NCR5380_read(STATUS_REG)(*((base + 0x3880 + 4)));
1899	if (tmp & SR_REQ0x20)
1900	*phase = tmp & PHASE_MASK(0x10 \| 0x08 \| 0x04);
1901	else
1902	*phase = PHASE_UNKNOWN0xff;
1903
1904	if (!c \|\| (*phase == p))
1905	return 0;
1906	else
1907	return -1;
1908	}
1909
1910	static void do_reset (struct Scsi_Host *host) {
1911	NCR5380_local_declare()volatile unsigned char *base;
1912	NCR5380_setup(host)base = (volatile unsigned char *) (host)->base;
1913
1914	cli()__asm__ __volatile__ ("cli": : :"memory");
1915	NCR5380_write(TARGET_COMMAND_REG,(((base + 0x3880 + 3)) = ((((((base + 0x3880 + 4))) & ( 0x10 \| 0x08 \| 0x04)) >> 2)))
1916	PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK))(((base + 0x3880 + 3)) = ((((((base + 0x3880 + 4))) & ( 0x10 \| 0x08 \| 0x04)) >> 2)));
1917	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE \| ICR_ASSERT_RST)(*((base + 0x3880 + 1)) = (0 \| 0x80));
1918	udelay(25)(__builtin_constant_p(25) ? __const_udelay((25) * 0x10c6ul) : __udelay(25));
1919	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE)(*((base + 0x3880 + 1)) = (0));
1920	sti()__asm__ __volatile__ ("sti": : :"memory");
1921	}
1922
1923	/*
1924	* Function : do_abort (Scsi_Host *host)
1925	*
1926	* Purpose : abort the currently established nexus. Should only be
1927	* called from a routine which can drop into a
1928	*
1929	* Returns : 0 on success, -1 on failure.
1930	*/
1931
1932	static int do_abort (struct Scsi_Host *host) {
1933	NCR5380_local_declare()volatile unsigned char *base;
1934	unsigned char tmp, *msgptr, phase;
1935	int len;
1936	NCR5380_setup(host)base = (volatile unsigned char *) (host)->base;
1937
1938
1939	/* Request message out phase */
1940	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE \| ICR_ASSERT_ATN)(*((base + 0x3880 + 1)) = (0 \| 0x02));
1941
1942	/*
1943	* Wait for the target to indicate a valid phase by asserting
1944	* REQ. Once this happens, we'll have either a MSGOUT phase
1945	* and can immediately send the ABORT message, or we'll have some
1946	* other phase and will have to source/sink data.
1947	*
1948	* We really don't care what value was on the bus or what value
1949	* the target sees, so we just handshake.
1950	*/
1951
1952	while (!((tmp = NCR5380_read(STATUS_REG)(*((base + 0x3880 + 4)))) & SR_REQ0x20));
1953
1954	NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp))(*((base + 0x3880 + 3)) = (((tmp) >> 2)));
1955
1956	if ((tmp & PHASE_MASK(0x10 \| 0x08 \| 0x04)) != PHASE_MSGOUT(0x10 \| 0x08)) {
1957	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE \| ICR_ASSERT_ATN \|(*((base + 0x3880 + 1)) = (0 \| 0x02 \| 0x10))
1958	ICR_ASSERT_ACK)(*((base + 0x3880 + 1)) = (0 \| 0x02 \| 0x10));
1959	while (NCR5380_read(STATUS_REG)(*((base + 0x3880 + 4))) & SR_REQ0x20);
1960	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE \| ICR_ASSERT_ATN)(*((base + 0x3880 + 1)) = (0 \| 0x02));
1961	}
1962
1963	tmp = ABORT0x06;
1964	msgptr = &tmp;
1965	len = 1;
1966	phase = PHASE_MSGOUT(0x10 \| 0x08);
1967	NCR5380_transfer_pio (host, &phase, &len, &msgptr);
1968
1969	/*
1970	* If we got here, and the command completed successfully,
1971	* we're about to go into bus free state.
1972	*/
1973
1974	return len ? -1 : 0;
1975	}
1976
1977	#if defined(REAL_DMA) \|\| defined(PSEUDO_DMA) \|\| defined (REAL_DMA_POLL)
1978	/*
1979	* Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1980	* unsigned char phase, int count, unsigned char **data)
1981	*
1982	* Purpose : transfers data in given phase using either real
1983	* or pseudo DMA.
1984	*
1985	* Inputs : instance - instance of driver, *phase - pointer to
1986	* what phase is expected, *count - pointer to number of
1987	* bytes to transfer, **data - pointer to data pointer.
1988	*
1989	* Returns : -1 when different phase is entered without transferring
1990	* maximum number of bytes, 0 if all bytes or transfered or exit
1991	* is in same phase.
1992	*
1993	* Also, phase, count, *data are modified in place.
1994	*
1995	*/
1996
1997
1998	static int NCR5380_transfer_dma (struct Scsi_Host *instance,
1999	unsigned char phase, int count, unsigned char **data) {
2000	NCR5380_local_declare()volatile unsigned char *base;
2001	register int c = *count;
2002	register unsigned char p = *phase;
2003	register unsigned char d = data;
2004	unsigned char tmp;
2005	int foo;
2006	#if defined(REAL_DMA_POLL)
2007	int cnt, toPIO;
2008	unsigned char saved_data = 0, overrun = 0, residue;
2009	#endif
2010
2011	struct NCR5380_hostdata hostdata = (struct NCR5380_hostdata )
2012	instance->hostdata;
2013
2014	NCR5380_setup(instance)base = (volatile unsigned char *) (instance)->base;
2015
2016	if ((tmp = (NCR5380_read(STATUS_REG)(*((base + 0x3880 + 4))) & PHASE_MASK(0x10 \| 0x08 \| 0x04))) != p) {
2017	*phase = tmp;
2018	return -1;
2019	}
2020	#if defined(REAL_DMA) \|\| defined(REAL_DMA_POLL)
2021	#ifdef READ_OVERRUNS
2022	if (p & SR_IO0x04) {
2023	c -= 2;
2024	}
2025	#endif
2026	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_DMA0x4)
2027	printk("scsi%d : initializing DMA channel %d for %s, %d bytes %s %0x\n",
2028	instance->host_no, instance->dma_channel, (p & SR_IO0x04) ? "reading" :
2029	"writing", c, (p & SR_IO0x04) ? "to" : "from", (unsigned) d);
2030	#endif
2031	hostdata->dma_len = (p & SR_IO0x04) ?
2032	NCR5380_dma_read_setup(instance, d, c) :
2033	NCR5380_dma_write_setup(instance, d, c);
2034	#endif
2035
2036	NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p))(*((base + 0x3880 + 3)) = (((p) >> 2)));
2037
2038	#ifdef REAL_DMA
2039	NCR5380_write(MODE_REG, MR_BASE \| MR_DMA_MODE \| MR_ENABLE_EOP_INTR \| MR_MONITOR_BSY)(*((base + 0x3880 + 2)) = (0 \| 0x02 \| 0x08 \| 0x04));
2040	#elif defined(REAL_DMA_POLL)
2041	NCR5380_write(MODE_REG, MR_BASE \| MR_DMA_MODE)(*((base + 0x3880 + 2)) = (0 \| 0x02));
2042	#else
2043	/*
2044	* Note : on my sample board, watch-dog timeouts occurred when interrupts
2045	* were not disabled for the duration of a single DMA transfer, from
2046	* before the setting of DMA mode to after transfer of the last byte.
2047	*/
2048
2049	#if defined(PSEUDO_DMA) && !defined(UNSAFE)
2050	cli()__asm__ __volatile__ ("cli": : :"memory");
2051	#endif
2052	/* KLL May need eop and parity in 53c400 */
2053	if (hostdata->flags & FLAG_NCR53C4004)
2054	NCR5380_write(MODE_REG, MR_BASE \| MR_DMA_MODE \| MR_ENABLE_PAR_CHECK(*((base + 0x3880 + 2)) = (0 \| 0x02 \| 0x20 \| 0x10 \| 0x08 \| 0x02 \| 0x04))
2055	\| MR_ENABLE_PAR_INTR \| MR_ENABLE_EOP_INTR \| MR_DMA_MODE(*((base + 0x3880 + 2)) = (0 \| 0x02 \| 0x20 \| 0x10 \| 0x08 \| 0x02 \| 0x04))
2056	\| MR_MONITOR_BSY)(*((base + 0x3880 + 2)) = (0 \| 0x02 \| 0x20 \| 0x10 \| 0x08 \| 0x02 \| 0x04));
2057	else
2058	NCR5380_write(MODE_REG, MR_BASE \| MR_DMA_MODE)(*((base + 0x3880 + 2)) = (0 \| 0x02));
2059	#endif /* def REAL_DMA */
2060
2061	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_DMA0x4) & 0
2062	printk("scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG)(*((base + 0x3880 + 2))));
2063	#endif
2064
2065	/*
2066	* FOO stuff. For some UNAPPARENT reason, I'm getting
2067	* watchdog timers fired on bootup for NO APPARENT REASON, meaning it's
2068	* probably a timing problem.
2069	*
2070	* Since this is the only place I have back-to-back writes, perhaps this
2071	* is the problem?
2072	*/
2073
2074	if (p & SR_IO0x04) {
2075	#ifndef FOO
2076	udelay(1)(__builtin_constant_p(1) ? __const_udelay((1) * 0x10c6ul) : __udelay (1));
2077	#endif
2078	NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0)(*((base + 0x3880 + 7)) = (0));
2079	} else {
2080	#ifndef FOO
2081	udelay(1)(__builtin_constant_p(1) ? __const_udelay((1) * 0x10c6ul) : __udelay (1));
2082	#endif
2083	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE \| ICR_ASSERT_DATA)(*((base + 0x3880 + 1)) = (0 \| 0x01));
2084	#ifndef FOO
2085	udelay(1)(__builtin_constant_p(1) ? __const_udelay((1) * 0x10c6ul) : __udelay (1));
2086	#endif
2087	NCR5380_write(START_DMA_SEND_REG, 0)(*((base + 0x3880 + 5)) = (0));
2088	#ifndef FOO
2089	udelay(1)(__builtin_constant_p(1) ? __const_udelay((1) * 0x10c6ul) : __udelay (1));
2090	#endif
2091	}
2092
2093	#if defined(REAL_DMA_POLL)
2094	do {
2095	tmp = NCR5380_read(BUS_AND_STATUS_REG)(*((base + 0x3880 + 5)));
2096	} while ((tmp & BASR_PHASE_MATCH0x08) && !(tmp & (BASR_BUSY_ERROR0x04 \|
2097	BASR_END_DMA_TRANSFER0x80)));
2098
2099	/*
2100	At this point, either we've completed DMA, or we have a phase mismatch,
2101	or we've unexpectedly lost BUSY (which is a real error).
2102
2103	For write DMAs, we want to wait until the last byte has been
2104	transferred out over the bus before we turn off DMA mode. Alas, there
2105	seems to be no terribly good way of doing this on a 5380 under all
2106	conditions. For non-scatter-gather operations, we can wait until REQ
2107	and ACK both go false, or until a phase mismatch occurs. Gather-writes
2108	are nastier, since the device will be expecting more data than we
2109	are prepared to send it, and REQ will remain asserted. On a 53C8[01] we
2110	could test LAST BIT SENT to assure transfer (I imagine this is precisely
2111	why this signal was added to the newer chips) but on the older 538[01]
2112	this signal does not exist. The workaround for this lack is a watchdog;
2113	we bail out of the wait-loop after a modest amount of wait-time if
2114	the usual exit conditions are not met. Not a terribly clean or
2115	correct solution :-%
2116
2117	Reads are equally tricky due to a nasty characteristic of the NCR5380.
2118	If the chip is in DMA mode for an READ, it will respond to a target's
2119	REQ by latching the SCSI data into the INPUT DATA register and asserting
2120	ACK, even if it has _already_ been notified by the DMA controller that
2121	the current DMA transfer has completed! If the NCR5380 is then taken
2122	out of DMA mode, this already-acknowledged byte is lost.
2123
2124	This is not a problem for "one DMA transfer per command" reads, because
2125	the situation will never arise... either all of the data is DMA'ed
2126	properly, or the target switches to MESSAGE IN phase to signal a
2127	disconnection (either operation bringing the DMA to a clean halt).
2128	However, in order to handle scatter-reads, we must work around the
2129	problem. The chosen fix is to DMA N-2 bytes, then check for the
2130	condition before taking the NCR5380 out of DMA mode. One or two extra
2131	bytes are transferred via PIO as necessary to fill out the original
2132	request.
2133	*/
2134
2135	if (p & SR_IO0x04) {
2136	#ifdef READ_OVERRUNS
2137	udelay(10)(__builtin_constant_p(10) ? __const_udelay((10) * 0x10c6ul) : __udelay(10));
2138	if (((NCR5380_read(BUS_AND_STATUS_REG)(*((base + 0x3880 + 5))) & (BASR_PHASE_MATCH0x08\|BASR_ACK0x01)) ==
2139	(BASR_PHASE_MATCH0x08 \| BASR_ACK0x01))) {
2140	saved_data = NCR5380_read(INPUT_DATA_REGISTER)(*((base + 0x3880 + INPUT_DATA_REGISTER)));
2141	overrun = 1;
2142	}
2143	#endif
2144	} else {
2145	int limit = 100;
2146	while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)(*((base + 0x3880 + 5)))) & BASR_ACK0x01) \|\|
2147	(NCR5380_read(STATUS_REG)(*((base + 0x3880 + 4))) & SR_REQ0x20)) {
2148	if (!(tmp & BASR_PHASE_MATCH0x08)) break;
2149	if (--limit < 0) break;
2150	}
2151	}
2152
2153
2154	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_DMA0x4)
2155	printk("scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n",
2156	instance->host_no, tmp, NCR5380_read(STATUS_REG)(*((base + 0x3880 + 4))));
2157	#endif
2158
2159	NCR5380_write(MODE_REG, MR_BASE)(*((base + 0x3880 + 2)) = (0));
2160	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE)(*((base + 0x3880 + 1)) = (0));
2161
2162	residue = NCR5380_dma_residual(instance);
2163	c -= residue;
2164	*count -= c;
2165	*data += c;
2166	phase = NCR5380_read(STATUS_REG)(((base + 0x3880 + 4))) & PHASE_MASK(0x10 \| 0x08 \| 0x04);
2167
2168	#ifdef READ_OVERRUNS
2169	if (*phase == p && (p & SR_IO0x04) && residue == 0) {
2170	if (overrun) {
2171	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_DMA0x4)
2172	printk("Got an input overrun, using saved byte\n");
2173	#endif
2174	**data = saved_data;
2175	*data += 1;
2176	*count -= 1;
2177	cnt = toPIO = 1;
2178	} else {
2179	printk("No overrun??\n");
2180	cnt = toPIO = 2;
2181	}
2182	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_DMA0x4)
2183	printk("Doing %d-byte PIO to 0x%X\n", cnt, *data);
2184	#endif
2185	NCR5380_transfer_pio(instance, phase, &cnt, data);
2186	*count -= toPIO - cnt;
2187	}
2188	#endif
2189
2190	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_DMA0x4)
2191	printk("Return with data ptr = 0x%X, count %d, last 0x%X, next 0x%X\n",
2192	data, count, (data+count-1), (data+count));
2193	#endif
2194	return 0;
2195
2196	#elif defined(REAL_DMA)
2197	return 0;
2198	#else /* defined(REAL_DMA_POLL) */
2199	if (p & SR_IO0x04) {
2200	#ifdef DMA_WORKS_RIGHT
2201	foo = NCR5380_pread(instance, d, c);
2202	#else
2203	int diff = 1;
2204	if (hostdata->flags & FLAG_NCR53C4004) {
2205	diff=0;
2206	}
2207
2208	if (!(foo = NCR5380_pread(instance, d, c - diff))) {
2209	/*
2210	* We can't disable DMA mode after successfully transferring
2211	* what we plan to be the last byte, since that would open up
2212	* a race condition where if the target asserted REQ before
2213	* we got the DMA mode reset, the NCR5380 would have latched
2214	* an additional byte into the INPUT DATA register and we'd
2215	* have dropped it.
2216	*
2217	* The workaround was to transfer one fewer bytes than we
2218	* intended to with the pseudo-DMA read function, wait for
2219	* the chip to latch the last byte, read it, and then disable
2220	* pseudo-DMA mode.
2221	*
2222	* After REQ is asserted, the NCR5380 asserts DRQ and ACK.
2223	* REQ is deasserted when ACK is asserted, and not reasserted
2224	* until ACK goes false. Since the NCR5380 won't lower ACK
2225	* until DACK is asserted, which won't happen unless we twiddle
2226	* the DMA port or we take the NCR5380 out of DMA mode, we
2227	* can guarantee that we won't handshake another extra
2228	* byte.
2229	*/
2230
2231	if (!(hostdata->flags & FLAG_NCR53C4004)) {
2232	while (!(NCR5380_read(BUS_AND_STATUS_REG)(*((base + 0x3880 + 5))) & BASR_DRQ0x40));
2233	/* Wait for clean handshake */
2234	while (NCR5380_read(STATUS_REG)(*((base + 0x3880 + 4))) & SR_REQ0x20);
2235	d[c - 1] = NCR5380_read(INPUT_DATA_REG)(*((base + 0x3880 + 6)));
2236	}
2237	}
2238	#endif
2239	} else {
2240	#ifdef DMA_WORKS_RIGHT
2241	foo = NCR5380_pwrite(instance, d, c);
2242	#else
2243	int timeout;
2244	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_C400_PWRITE0x200000)
2245	printk("About to pwrite %d bytes\n", c);
2246	#endif
2247	if (!(foo = NCR5380_pwrite(instance, d, c))) {
2248	/*
2249	* Wait for the last byte to be sent. If REQ is being asserted for
2250	* the byte we're interested, we'll ACK it and it will go false.
2251	*/
2252	if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT1)) {
2253	timeout = 20000;
2254	#if 1
2255	#if 1
2256	while (!(NCR5380_read(BUS_AND_STATUS_REG)(*((base + 0x3880 + 5))) &
2257	BASR_DRQ0x40) && (NCR5380_read(BUS_AND_STATUS_REG)(*((base + 0x3880 + 5))) &
2258	BASR_PHASE_MATCH0x08));
2259	#else
2260	if (NCR5380_read(STATUS_REG)(*((base + 0x3880 + 4))) & SR_REQ0x20) {
2261	for (; timeout &&
2262	!(NCR5380_read(BUS_AND_STATUS_REG)(*((base + 0x3880 + 5))) & BASR_ACK0x01);
2263	--timeout);
2264	for (; timeout && (NCR5380_read(STATUS_REG)(*((base + 0x3880 + 4))) & SR_REQ0x20);
2265	--timeout);
2266	}
2267	#endif
2268
2269
2270	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_LAST_BYTE_SENT0x20000)
2271	if (!timeout)
2272	printk("scsi%d : timed out on last byte\n",
2273	instance->host_no);
2274	#endif
2275
2276
2277	if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT2) {
2278	hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT2;
2279	if (NCR5380_read(TARGET_COMMAND_REG)(*((base + 0x3880 + 3))) & TCR_LAST_BYTE_SENT0x80) {
2280	hostdata->flags \|= FLAG_HAS_LAST_BYTE_SENT1;
2281	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_LAST_BYTE_SENT0x20000)
2282	printk("scsi%d : last bit sent works\n",
2283	instance->host_no);
2284	#endif
2285	}
2286	}
2287	} else {
2288	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_C400_PWRITE0x200000)
2289	printk("Waiting for LASTBYTE\n");
2290	#endif
2291	while (!(NCR5380_read(TARGET_COMMAND_REG)(*((base + 0x3880 + 3))) & TCR_LAST_BYTE_SENT0x80));
2292	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_C400_PWRITE0x200000)
2293	printk("Got LASTBYTE\n");
2294	#endif
2295	}
2296	#else
2297	udelay (5)(__builtin_constant_p(5) ? __const_udelay((5) * 0x10c6ul) : __udelay (5));
2298	#endif
2299	}
2300	#endif
2301	}
2302
2303	NCR5380_write(MODE_REG, MR_BASE)(*((base + 0x3880 + 2)) = (0));
2304	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE)(*((base + 0x3880 + 1)) = (0));
2305
2306	if ((!(p & SR_IO0x04)) && (hostdata->flags & FLAG_NCR53C4004)) {
2307	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_C400_PWRITE0x200000)
2308	printk("53C400w: Checking for IRQ\n");
2309	#endif
2310	if (NCR5380_read(BUS_AND_STATUS_REG)(*((base + 0x3880 + 5))) & BASR_IRQ0x10) {
2311	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_C400_PWRITE0x200000)
2312	printk("53C400w: got it, reading reset interrupt reg\n");
2313	#endif
2314	NCR5380_read(RESET_PARITY_INTERRUPT_REG)(*((base + 0x3880 + 7)));
2315	} else {
2316	printk("53C400w: IRQ NOT THERE!\n");
2317	}
2318	}
2319
2320	*data = d + c;
2321	*count = 0;
2322	phase = NCR5380_read(STATUS_REG)(((base + 0x3880 + 4))) & PHASE_MASK(0x10 \| 0x08 \| 0x04);
2323	#if 0
2324	NCR5380_print_phase(instance);
2325	#endif
2326	#if defined(PSEUDO_DMA) && !defined(UNSAFE)
2327	sti()__asm__ __volatile__ ("sti": : :"memory");
2328	#endif /* defined(REAL_DMA_POLL) */
2329	return foo;
2330	#endif /* def REAL_DMA */
2331	}
2332	#endif /* defined(REAL_DMA) \| defined(PSEUDO_DMA) */
2333
2334	/*
2335	* Function : NCR5380_information_transfer (struct Scsi_Host *instance)
2336	*
2337	* Purpose : run through the various SCSI phases and do as the target
2338	* directs us to. Operates on the currently connected command,
2339	* instance->connected.
2340	*
2341	* Inputs : instance, instance for which we are doing commands
2342	*
2343	* Side effects : SCSI things happen, the disconnected queue will be
2344	* modified if a command disconnects, *instance->connected will
2345	* change.
2346	*
2347	* XXX Note : we need to watch for bus free or a reset condition here
2348	* to recover from an unexpected bus free condition.
2349	*/
2350
2351	static void NCR5380_information_transfer (struct Scsi_Host *instance) {
2352	NCR5380_local_declare()volatile unsigned char *base;
2353	struct NCR5380_hostdata hostdata = (struct NCR5380_hostdata )
2354	instance->hostdata;
2355	unsigned char msgout = NOP0x08;
2356	int sink = 0;
2357	int len;
2358	#if defined(PSEUDO_DMA) \|\| defined(REAL_DMA_POLL)
2359	int transfersize;
2360	#endif
2361	unsigned char *data;
2362	unsigned char phase, tmp, extended_msg[10], old_phase=0xff;
2363	Scsi_Cmnd cmd = (Scsi_Cmnd ) hostdata->connected;
2364	NCR5380_setup(instance)base = (volatile unsigned char *) (instance)->base;
2365
2366	while (1) {
2367	tmp = NCR5380_read(STATUS_REG)(*((base + 0x3880 + 4)));
2368	/* We only have a valid SCSI phase when REQ is asserted */
2369	if (tmp & SR_REQ0x20) {
2370	phase = (tmp & PHASE_MASK(0x10 \| 0x08 \| 0x04));
2371	if (phase != old_phase) {
2372	old_phase = phase;
2373	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_INFORMATION0x10)
2374	NCR5380_print_phase(instance);
2375	#endif
2376	}
2377
2378	if (sink && (phase != PHASE_MSGOUT(0x10 \| 0x08))) {
2379	NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp))(*((base + 0x3880 + 3)) = (((tmp) >> 2)));
2380
2381	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE \| ICR_ASSERT_ATN \|(*((base + 0x3880 + 1)) = (0 \| 0x02 \| 0x10))
2382	ICR_ASSERT_ACK)(*((base + 0x3880 + 1)) = (0 \| 0x02 \| 0x10));
2383	while (NCR5380_read(STATUS_REG)(*((base + 0x3880 + 4))) & SR_REQ0x20);
2384	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE \|(*((base + 0x3880 + 1)) = (0 \| 0x02))
2385	ICR_ASSERT_ATN)(*((base + 0x3880 + 1)) = (0 \| 0x02));
2386	sink = 0;
2387	continue;
2388	}
2389
2390	switch (phase) {
2391	case PHASE_DATAIN0x04:
2392	case PHASE_DATAOUT0:
2393	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_NO_DATAOUT0x200)
2394	printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n",
2395	instance->host_no);
2396	sink = 1;
2397	do_abort(instance);
2398	cmd->result = DID_ERROR0x07 << 16;
2399	cmd->done(cmd);
2400	return;
2401	#endif
2402	/*
2403	* If there is no room left in the current buffer in the
2404	* scatter-gather list, move onto the next one.
2405	*/
2406
2407	if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2408	++cmd->SCp.buffer;
2409	--cmd->SCp.buffers_residual;
2410	cmd->SCp.this_residual = cmd->SCp.buffer->length;
2411	cmd->SCp.ptr = cmd->SCp.buffer->address;
2412	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_INFORMATION0x10)
2413	printk("scsi%d : %d bytes and %d buffers left\n",
2414	instance->host_no, cmd->SCp.this_residual,
2415	cmd->SCp.buffers_residual);
2416	#endif
2417	}
2418
2419	/*
2420	* The preferred transfer method is going to be
2421	* PSEUDO-DMA for systems that are strictly PIO,
2422	* since we can let the hardware do the handshaking.
2423	*
2424	* For this to work, we need to know the transfersize
2425	* ahead of time, since the pseudo-DMA code will sit
2426	* in an unconditional loop.
2427	*/
2428
2429	#if defined(PSEUDO_DMA) \|\| defined(REAL_DMA_POLL)
2430	/* KLL
2431	* PSEUDO_DMA is defined here. If this is the g_NCR5380
2432	* driver then it will always be defined, so the
2433	* FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base
2434	* NCR5380 case. I think this is a fairly clean solution.
2435	* We supplement these 2 if's with the flag.
2436	*/
2437	#ifdef NCR5380_dma_xfer_len
2438	if (!cmd->device->borken &&
2439	!(hostdata->flags & FLAG_NO_PSEUDO_DMA8) &&
2440	(transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) {
2441	#else
2442	transfersize = cmd->transfersize;
2443
2444	#ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */
2445	if( transfersize > 512 )
2446	transfersize = 512;
2447	#endif /* LIMIT_TRANSFERSIZE */
2448
2449	if (!cmd->device->borken && transfersize &&
2450	!(hostdata->flags & FLAG_NO_PSEUDO_DMA8) &&
2451	cmd->SCp.this_residual && !(cmd->SCp.this_residual %
2452	transfersize)) {
2453	/* Limit transfers to 32K, for xx400 & xx406
2454	* pseudoDMA that transfers in 128 bytes blocks. */
2455	if (transfersize > 32*1024)
2456	transfersize = 32*1024;
2457	#endif
2458	len = transfersize;
2459	if (NCR5380_transfer_dma(instance, &phase,
2460	&len, (unsigned char **) &cmd->SCp.ptr)) {
2461	/*
2462	* If the watchdog timer fires, all future accesses to this
2463	* device will use the polled-IO.
2464	*/
2465	printk("scsi%d : switching target %d lun %d to slow handshake\n",
2466	instance->host_no, cmd->target, cmd->lun);
2467	cmd->device->borken = 1;
2468	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE \|(*((base + 0x3880 + 1)) = (0 \| 0x02))
2469	ICR_ASSERT_ATN)(*((base + 0x3880 + 1)) = (0 \| 0x02));
2470	sink = 1;
2471	do_abort(instance);
2472	cmd->result = DID_ERROR0x07 << 16;
2473	cmd->done(cmd);
2474	/* XXX - need to source or sink data here, as appropriate */
2475	} else
2476	cmd->SCp.this_residual -= transfersize - len;
2477	} else
2478	#endif /* defined(PSEUDO_DMA) \|\| defined(REAL_DMA_POLL) */
2479	NCR5380_transfer_pio(instance, &phase,
2480	(int ) &cmd->SCp.this_residual, (unsigned char *)
2481	&cmd->SCp.ptr);
2482	break;
2483	case PHASE_MSGIN(0x10 \| 0x08 \| 0x04):
2484	len = 1;
2485	data = &tmp;
2486	NCR5380_transfer_pio(instance, &phase, &len, &data);
2487	cmd->SCp.Message = tmp;
2488
2489	switch (tmp) {
2490	/*
2491	* Linking lets us reduce the time required to get the
2492	* next command out to the device, hopefully this will
2493	* mean we don't waste another revolution due to the delays
2494	* required by ARBITRATION and another SELECTION.
2495	*
2496	* In the current implementation proposal, low level drivers
2497	* merely have to start the next command, pointed to by
2498	* next_link, done() is called as with unlinked commands.
2499	*/
2500	#ifdef LINKED
2501	case LINKED_CMD_COMPLETE0x0a:
2502	case LINKED_FLG_CMD_COMPLETE0x0b:
2503	/* Accept message by clearing ACK */
2504	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE)(*((base + 0x3880 + 1)) = (0));
2505
2506	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_LINKED0x80)
2507	printk("scsi%d : target %d lun %d linked command complete.\n",
2508	instance->host_no, cmd->target, cmd->lun);
2509	#endif
2510	/*
2511	* Sanity check : A linked command should only terminate with
2512	* one of these messages if there are more linked commands
2513	* available.
2514	*/
2515
2516	if (!cmd->next_link) {
2517	printk("scsi%d : target %d lun %d linked command complete, no next_link\n"
2518	instance->host_no, cmd->target, cmd->lun);
2519	sink = 1;
2520	do_abort (instance);
2521	return;
2522	}
2523
2524	initialize_SCp(cmd->next_link);
2525	/* The next command is still part of this process */
2526	cmd->next_link->tag = cmd->tag;
2527	cmd->result = cmd->SCp.Status \| (cmd->SCp.Message << 8);
2528	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_LINKED0x80)
2529	printk("scsi%d : target %d lun %d linked request done, calling scsi_done().\n",
2530	instance->host_no, cmd->target, cmd->lun);
2531	#endif
2532	#ifdef NCR5380_STATS
2533	collect_stats(hostdata, cmd);
2534	#endif
2535	cmd->scsi_done(cmd);
2536	cmd = hostdata->connected;
2537	break;
2538	#endif /* def LINKED */
2539	case ABORT0x06:
2540	case COMMAND_COMPLETE0x00:
2541	/* Accept message by clearing ACK */
2542	sink = 1;
2543	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE)(*((base + 0x3880 + 1)) = (0));
2544	hostdata->connected = NULL((void *) 0);
2545	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_QUEUES0x2000)
2546	printk("scsi%d : command for target %d, lun %d completed\n",
2547	instance->host_no, cmd->target, cmd->lun);
2548	#endif
2549	hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
2550
2551	/*
2552	* I'm not sure what the correct thing to do here is :
2553	*
2554	* If the command that just executed is NOT a request
2555	* sense, the obvious thing to do is to set the result
2556	* code to the values of the stored parameters.
2557	*
2558	* If it was a REQUEST SENSE command, we need some way
2559	* to differentiate between the failure code of the original
2560	* and the failure code of the REQUEST sense - the obvious
2561	* case is success, where we fall through and leave the result
2562	* code unchanged.
2563	*
2564	* The non-obvious place is where the REQUEST SENSE failed
2565	*/
2566
2567	if (cmd->cmnd[0] != REQUEST_SENSE0x03)
2568	cmd->result = cmd->SCp.Status \| (cmd->SCp.Message << 8);
2569	else if (cmd->SCp.Status != GOOD0x00)
2570	cmd->result = (cmd->result & 0x00ffff) \| (DID_ERROR0x07 << 16);
2571
2572	#ifdef AUTOSENSE
2573	if ((cmd->cmnd[0] != REQUEST_SENSE0x03) &&
2574	(cmd->SCp.Status == CHECK_CONDITION0x01)) {
2575	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_AUTOSENSE0x2)
2576	printk("scsi%d : performing request sense\n",
2577	instance->host_no);
2578	#endif
2579	cmd->cmnd[0] = REQUEST_SENSE0x03;
2580	cmd->cmnd[1] &= 0xe0;
2581	cmd->cmnd[2] = 0;
2582	cmd->cmnd[3] = 0;
2583	cmd->cmnd[4] = sizeof(cmd->sense_buffer);
2584	cmd->cmnd[5] = 0;
2585
2586	cmd->SCp.buffer = NULL((void *) 0);
2587	cmd->SCp.buffers_residual = 0;
2588	cmd->SCp.ptr = (char *) cmd->sense_buffer;
2589	cmd->SCp.this_residual = sizeof(cmd->sense_buffer);
2590
2591	cli()__asm__ __volatile__ ("cli": : :"memory");
2592	LIST(cmd,hostdata->issue_queue);
2593	cmd->host_scribble = (unsigned char *)
2594	hostdata->issue_queue;
2595	hostdata->issue_queue = (Scsi_Cmnd *) cmd;
2596	sti()__asm__ __volatile__ ("sti": : :"memory");
2597	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_QUEUES0x2000)
2598	printk("scsi%d : REQUEST SENSE added to head of issue queue\n",instance->host_no);
2599	#endif
2600	} else {
2601	#endif /* def AUTOSENSE */
2602	#ifdef NCR5380_STATS
2603	collect_stats(hostdata, cmd);
2604	#endif
2605	cmd->scsi_done(cmd);
2606	}
2607
2608	NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask)(*((base + 0x3880 + 4)) = (hostdata->id_mask));
2609	/*
2610	* Restore phase bits to 0 so an interrupted selection,
2611	* arbitration can resume.
2612	*/
2613	NCR5380_write(TARGET_COMMAND_REG, 0)(*((base + 0x3880 + 3)) = (0));
2614
2615	while ((NCR5380_read(STATUS_REG)(*((base + 0x3880 + 4))) & SR_BSY0x40) && !hostdata->connected)
2616	barrier()__asm__ __volatile__("": : :"memory");
2617	return;
2618	case MESSAGE_REJECT0x07:
2619	/* Accept message by clearing ACK */
2620	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE)(*((base + 0x3880 + 1)) = (0));
2621	switch (hostdata->last_message) {
2622	case HEAD_OF_QUEUE_TAG0x21:
2623	case ORDERED_QUEUE_TAG0x22:
2624	case SIMPLE_QUEUE_TAG0x20:
2625	cmd->device->tagged_queue = 0;
2626	hostdata->busy[cmd->target] \|= (1 << cmd->lun);
2627	break;
2628	default:
2629	break;
2630	}
2631	case DISCONNECT0x04:
2632	/* Accept message by clearing ACK */
2633	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE)(*((base + 0x3880 + 1)) = (0));
2634	cmd->device->disconnect = 1;
2635	cli()__asm__ __volatile__ ("cli": : :"memory");
2636	LIST(cmd,hostdata->disconnected_queue);
2637	cmd->host_scribble = (unsigned char *)
2638	hostdata->disconnected_queue;
2639	hostdata->connected = NULL((void *) 0);
2640	hostdata->disconnected_queue = cmd;
2641	sti()__asm__ __volatile__ ("sti": : :"memory");
2642	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_QUEUES0x2000)
2643	printk("scsi%d : command for target %d lun %d was moved from connected to"
2644	" the disconnected_queue\n", instance->host_no,
2645	cmd->target, cmd->lun);
2646	#endif
2647	/*
2648	* Restore phase bits to 0 so an interrupted selection,
2649	* arbitration can resume.
2650	*/
2651	NCR5380_write(TARGET_COMMAND_REG, 0)(*((base + 0x3880 + 3)) = (0));
2652
2653	/* Enable reselect interrupts */
2654	NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask)(*((base + 0x3880 + 4)) = (hostdata->id_mask));
2655	/* Wait for bus free to avoid nasty timeouts */
2656	while ((NCR5380_read(STATUS_REG)(*((base + 0x3880 + 4))) & SR_BSY0x40) && !hostdata->connected)
2657	barrier()__asm__ __volatile__("": : :"memory");
2658	#if 0
2659	NCR5380_print_status(instance);
2660	#endif
2661	return;
2662	/*
2663	* The SCSI data pointer is IMPLICITLY saved on a disconnect
2664	* operation, in violation of the SCSI spec so we can safely
2665	* ignore SAVE/RESTORE pointers calls.
2666	*
2667	* Unfortunately, some disks violate the SCSI spec and
2668	* don't issue the required SAVE_POINTERS message before
2669	* disconnecting, and we have to break spec to remain
2670	* compatible.
2671	*/
2672	case SAVE_POINTERS0x02:
2673	case RESTORE_POINTERS0x03:
2674	/* Accept message by clearing ACK */
2675	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE)(*((base + 0x3880 + 1)) = (0));
2676	break;
2677	case EXTENDED_MESSAGE0x01:
2678	/*
2679	* Extended messages are sent in the following format :
2680	* Byte
2681	* 0 EXTENDED_MESSAGE == 1
2682	* 1 length (includes one byte for code, doesn't
2683	* include first two bytes)
2684	* 2 code
2685	* 3..length+1 arguments
2686	*
2687	* Start the extended message buffer with the EXTENDED_MESSAGE
2688	* byte, since print_msg() wants the whole thing.
2689	*/
2690	extended_msg[0] = EXTENDED_MESSAGE0x01;
2691	/* Accept first byte by clearing ACK */
2692	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE)(*((base + 0x3880 + 1)) = (0));
2693
2694	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_EXTENDED0x80000)
2695	printk("scsi%d : receiving extended message\n",
2696	instance->host_no);
2697	#endif
2698
2699	len = 2;
2700	data = extended_msg + 1;
2701	phase = PHASE_MSGIN(0x10 \| 0x08 \| 0x04);
2702	NCR5380_transfer_pio(instance, &phase, &len, &data);
2703
2704	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_EXTENDED0x80000)
2705	printk("scsi%d : length=%d, code=0x%02x\n",
2706	instance->host_no, (int) extended_msg[1],
2707	(int) extended_msg[2]);
2708	#endif
2709
2710	if (!len && extended_msg[1] <=
2711	(sizeof (extended_msg) - 1)) {
2712	/* Accept third byte by clearing ACK */
2713	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE)(*((base + 0x3880 + 1)) = (0));
2714	len = extended_msg[1] - 1;
2715	data = extended_msg + 3;
2716	phase = PHASE_MSGIN(0x10 \| 0x08 \| 0x04);
2717
2718	NCR5380_transfer_pio(instance, &phase, &len, &data);
2719
2720	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_EXTENDED0x80000)
2721	printk("scsi%d : message received, residual %d\n",
2722	instance->host_no, len);
2723	#endif
2724
2725	switch (extended_msg[2]) {
2726	case EXTENDED_SDTR0x01:
2727	case EXTENDED_WDTR0x03:
2728	case EXTENDED_MODIFY_DATA_POINTER0x00:
2729	case EXTENDED_EXTENDED_IDENTIFY0x02:
2730	tmp = 0;
2731	}
2732	} else if (len) {
2733	printk("scsi%d: error receiving extended message\n",
2734	instance->host_no);
2735	tmp = 0;
2736	} else {
2737	printk("scsi%d: extended message code %02x length %d is too long\n",
2738	instance->host_no, extended_msg[2], extended_msg[1]);
2739	tmp = 0;
2740	}
2741	/* Fall through to reject message */
2742
2743	/*
2744	* If we get something weird that we aren't expecting,
2745	* reject it.
2746	*/
2747	default:
2748	if (!tmp) {
2749	printk("scsi%d: rejecting message ", instance->host_no);
2750	print_msg (extended_msg);
2751	printk("\n");
2752	} else if (tmp != EXTENDED_MESSAGE0x01)
2753	printk("scsi%d: rejecting unknown message %02x from target %d, lun %d\n",
2754	instance->host_no, tmp, cmd->target, cmd->lun);
2755	else
2756	printk("scsi%d: rejecting unknown extended message code %02x, length %d from target %d, lun %d\n",
2757	instance->host_no, extended_msg[1], extended_msg[0], cmd->target, cmd->lun);
2758
2759	msgout = MESSAGE_REJECT0x07;
2760	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE \|(*((base + 0x3880 + 1)) = (0 \| 0x02))
2761	ICR_ASSERT_ATN)(*((base + 0x3880 + 1)) = (0 \| 0x02));
2762	break;
2763	} /* switch (tmp) */
2764	break;
2765	case PHASE_MSGOUT(0x10 \| 0x08):
2766	len = 1;
2767	data = &msgout;
2768	hostdata->last_message = msgout;
2769	NCR5380_transfer_pio(instance, &phase, &len, &data);
2770	if (msgout == ABORT0x06) {
2771	hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
2772	hostdata->connected = NULL((void *) 0);
2773	cmd->result = DID_ERROR0x07 << 16;
2774	#ifdef NCR5380_STATS
2775	collect_stats(hostdata, cmd);
2776	#endif
2777	cmd->scsi_done(cmd);
2778	NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask)(*((base + 0x3880 + 4)) = (hostdata->id_mask));
2779	return;
2780	}
2781	msgout = NOP0x08;
2782	break;
2783	case PHASE_CMDOUT0x08:
2784	len = cmd->cmd_len;
2785	data = cmd->cmnd;
2786	/*
2787	* XXX for performance reasons, on machines with a
2788	* PSEUDO-DMA architecture we should probably
2789	* use the dma transfer function.
2790	*/
2791	NCR5380_transfer_pio(instance, &phase, &len,
2792	&data);
2793	#ifdef USLEEP
2794	if (!disconnect && should_disconnect(cmd->cmnd[0])) {
2795	hostdata->time_expires = jiffies + USLEEP_SLEEP;
2796	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_USLEEP0x10000)
2797	printk("scsi%d : issued command, sleeping until %ul\n", instance->host_no,
2798	hostdata->time_expires);
2799	#endif
2800	NCR5380_set_timer (instance);
2801	return;
2802	}
2803	#endif /* def USLEEP */
2804	break;
2805	case PHASE_STATIN(0x08 \| 0x04):
2806	len = 1;
2807	data = &tmp;
2808	NCR5380_transfer_pio(instance, &phase, &len, &data);
2809	cmd->SCp.Status = tmp;
2810	break;
2811	default:
2812	printk("scsi%d : unknown phase\n", instance->host_no);
2813	#ifdef NDEBUG(0x40000 \| NDEBUG_ABORT)
2814	NCR5380_print(instance);
2815	#endif
2816	} /* switch(phase) */
2817	} /* if (tmp * SR_REQ) */
2818	#ifdef USLEEP
2819	else {
2820	if (!disconnect && hostdata->time_expires && jiffies >
2821	hostdata->time_expires) {
2822	hostdata->time_expires = jiffies + USLEEP_SLEEP;
2823	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_USLEEP0x10000)
2824	printk("scsi%d : poll timed out, sleeping until %ul\n", instance->host_no,
2825	hostdata->time_expires);
2826	#endif
2827	NCR5380_set_timer (instance);
2828	return;
2829	}
2830	}
2831	#endif
2832	} /* while (1) */
2833	}
2834
2835	/*
2836	* Function : void NCR5380_reselect (struct Scsi_Host *instance)
2837	*
2838	* Purpose : does reselection, initializing the instance->connected
2839	* field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
2840	* nexus has been reestablished,
2841	*
2842	* Inputs : instance - this instance of the NCR5380.
2843	*
2844	*/
2845
2846
2847	static void NCR5380_reselect (struct Scsi_Host *instance) {
2848	NCR5380_local_declare()volatile unsigned char *base;
2849	struct NCR5380_hostdata hostdata = (struct NCR5380_hostdata )
2850	instance->hostdata;
2851	unsigned char target_mask;
2852	unsigned char lun, phase;
2853	int len;
2854	#ifdef SCSI2
2855	unsigned char tag;
2856	#endif
2857	unsigned char msg[3];
2858	unsigned char *data;
2859	Scsi_Cmnd tmp = NULL((void ) 0), *prev;
2860	int abort = 0;
2861	NCR5380_setup(instance)base = (volatile unsigned char *) (instance)->base;
2862
2863	/*
2864	* Disable arbitration, etc. since the host adapter obviously
2865	* lost, and tell an interrupted NCR5380_select() to restart.
2866	*/
2867
2868	NCR5380_write(MODE_REG, MR_BASE)(*((base + 0x3880 + 2)) = (0));
2869	hostdata->restart_select = 1;
2870
2871	target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG)(*((base + 0x3880 + 0))) & ~(hostdata->id_mask);
2872
2873	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_RESELECTION0x4000)
2874	printk("scsi%d : reselect\n", instance->host_no);
2875	#endif
2876
2877	/*
2878	* At this point, we have detected that our SCSI ID is on the bus,
2879	* SEL is true and BSY was false for at least one bus settle delay
2880	* (400 ns).
2881	*
2882	* We must assert BSY ourselves, until the target drops the SEL
2883	* signal.
2884	*/
2885
2886	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE \| ICR_ASSERT_BSY)(*((base + 0x3880 + 1)) = (0 \| 0x08));
2887
2888	while (NCR5380_read(STATUS_REG)(*((base + 0x3880 + 4))) & SR_SEL0x02);
2889	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE)(*((base + 0x3880 + 1)) = (0));
2890
2891	/*
2892	* Wait for target to go into MSGIN.
2893	*/
2894
2895	while (!(NCR5380_read(STATUS_REG)(*((base + 0x3880 + 4))) & SR_REQ0x20));
2896
2897	len = 1;
2898	data = msg;
2899	phase = PHASE_MSGIN(0x10 \| 0x08 \| 0x04);
2900	NCR5380_transfer_pio(instance, &phase, &len, &data);
2901
2902
2903	if (!(msg[0] & 0x80)) {
2904	printk("scsi%d : expecting IDENTIFY message, got ",
2905	instance->host_no);
2906	print_msg(msg);
2907	abort = 1;
2908	} else {
2909	/* Accept message by clearing ACK */
2910	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE)(*((base + 0x3880 + 1)) = (0));
2911	lun = (msg[0] & 0x07);
2912
2913	/*
2914	* We need to add code for SCSI-II to track which devices have
2915	* I_T_L_Q nexuses established, and which have simple I_T_L
2916	* nexuses so we can chose to do additional data transfer.
2917	*/
2918
2919	#ifdef SCSI2
2920	#error "SCSI-II tagged queueing is not supported yet"
2921	#endif
2922
2923	/*
2924	* Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2925	* just reestablished, and remove it from the disconnected queue.
2926	*/
2927
2928
2929	for (tmp = (Scsi_Cmnd ) hostdata->disconnected_queue, prev = NULL((void ) 0);
2930	tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble)
2931	if ((target_mask == (1 << tmp->target)) && (lun == tmp->lun)
2932	#ifdef SCSI2
2933	&& (tag == tmp->tag)
2934	#endif
2935	) {
2936	if (prev) {
2937	REMOVE(prev,prev->host_scribble,tmp,tmp->host_scribble);
2938	prev->host_scribble = tmp->host_scribble;
2939	} else {
2940	REMOVE(-1,hostdata->disconnected_queue,tmp,tmp->host_scribble);
2941	hostdata->disconnected_queue = (Scsi_Cmnd *) tmp->host_scribble;
2942	}
2943	tmp->host_scribble = NULL((void *) 0);
2944	break;
2945	}
2946
2947	if (!tmp) {
2948	#ifdef SCSI2
2949	printk("scsi%d : warning : target bitmask %02x lun %d tag %d not in disconnect_queue.\n",
2950	instance->host_no, target_mask, lun, tag);
2951	#else
2952	printk("scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n",
2953	instance->host_no, target_mask, lun);
2954	#endif
2955	/*
2956	* Since we have an established nexus that we can't do anything with,
2957	* we must abort it.
2958	*/
2959	abort = 1;
2960	}
2961	}
2962
2963	if (abort) {
2964	do_abort (instance);
2965	} else {
2966	hostdata->connected = tmp;
2967	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_RESELECTION0x4000)
2968	printk("scsi%d : nexus established, target = %d, lun = %d, tag = %d\n",
2969	instance->host_no, tmp->target, tmp->lun, tmp->tag);
2970	#endif
2971	}
2972	}
2973
2974	/*
2975	* Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
2976	*
2977	* Purpose : called by interrupt handler when DMA finishes or a phase
2978	* mismatch occurs (which would finish the DMA transfer).
2979	*
2980	* Inputs : instance - this instance of the NCR5380.
2981	*
2982	* Returns : pointer to the Scsi_Cmnd structure for which the I_T_L
2983	* nexus has been reestablished, on failure NULL is returned.
2984	*/
2985
2986	#ifdef REAL_DMA
2987	static void NCR5380_dma_complete (NCR5380_instance *instance) {
2988	NCR5380_local_declare()volatile unsigned char *base;
2989	struct NCR5380_hostdata hostdata = (struct NCR5380_hostdata
2990	instance->hostdata);
2991	int transferred;
2992	NCR5380_setup(instance)base = (volatile unsigned char *) (instance)->base;
2993
2994	/*
2995	* XXX this might not be right.
2996	*
2997	* Wait for final byte to transfer, ie wait for ACK to go false.
2998	*
2999	* We should use the Last Byte Sent bit, unfortunately this is
3000	* not available on the 5380/5381 (only the various CMOS chips)
3001	*/
3002
3003	while (NCR5380_read(BUS_AND_STATUS_REG)(*((base + 0x3880 + 5))) & BASR_ACK0x01);
3004
3005	NCR5380_write(MODE_REG, MR_BASE)(*((base + 0x3880 + 2)) = (0));
3006	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE)(*((base + 0x3880 + 1)) = (0));
3007
3008	/*
3009	* The only places we should see a phase mismatch and have to send
3010	* data from the same set of pointers will be the data transfer
3011	* phases. So, residual, requested length are only important here.
3012	*/
3013
3014	if (!(hostdata->connected->SCp.phase & SR_CD0x08)) {
3015	transferred = instance->dmalen - NCR5380_dma_residual();
3016	hostdata->connected->SCp.this_residual -= transferred;
3017	hostdata->connected->SCp.ptr += transferred;
3018	}
3019	}
3020	#endif /* def REAL_DMA */
3021
3022	/*
3023	* Function : int NCR5380_abort (Scsi_Cmnd *cmd)
3024	*
3025	* Purpose : abort a command
3026	*
3027	* Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
3028	* host byte of the result field to, if zero DID_ABORTED is
3029	* used.
3030	*
3031	* Returns : 0 - success, -1 on failure.
3032	*
3033	* XXX - there is no way to abort the command that is currently
3034	* connected, you have to wait for it to complete. If this is
3035	* a problem, we could implement longjmp() / setjmp(), setjmp()
3036	* called where the loop started in NCR5380_main().
3037	*/
3038
3039	#ifndef NCR5380_abortdtc_abort
3040	static
3041	#endif
3042	int NCR5380_abortdtc_abort (Scsi_Cmnd *cmd) {
3043	NCR5380_local_declare()volatile unsigned char *base;
3044	struct Scsi_Host *instance = cmd->host;
3045	struct NCR5380_hostdata hostdata = (struct NCR5380_hostdata )
3046	instance->hostdata;
3047	Scsi_Cmnd tmp, *prev;
3048
3049	printk("scsi%d : aborting command\n", instance->host_no);
3050	print_Scsi_Cmnd (cmd);
3051
3052	NCR5380_print_status (instance);
3053
3054	printk("scsi%d : aborting command\n", instance->host_no);
3055	print_Scsi_Cmnd (cmd);
3056
3057	NCR5380_print_status (instance);
3058
3059	cli()__asm__ __volatile__ ("cli": : :"memory");
3060	NCR5380_setup(instance)base = (volatile unsigned char *) (instance)->base;
3061
3062	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_ABORT)
3063	printk("scsi%d : abort called\n", instance->host_no);
3064	printk(" basr 0x%X, sr 0x%X\n",
3065	NCR5380_read(BUS_AND_STATUS_REG)(((base + 0x3880 + 5))), NCR5380_read(STATUS_REG)(((base + 0x3880 + 4))));
3066	#endif
3067
3068	#if 0
3069	/*
3070	* Case 1 : If the command is the currently executing command,
3071	* we'll set the aborted flag and return control so that
3072	* information transfer routine can exit cleanly.
3073	*/
3074
3075	if (hostdata->connected == cmd) {
3076	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_ABORT)
3077	printk("scsi%d : aborting connected command\n", instance->host_no);
3078	#endif
3079	hostdata->aborted = 1;
3080	/*
3081	* We should perform BSY checking, and make sure we haven't slipped
3082	* into BUS FREE.
3083	*/
3084
3085	NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN)(*((base + 0x3880 + 1)) = (0x02));
3086	/*
3087	* Since we can't change phases until we've completed the current
3088	* handshake, we have to source or sink a byte of data if the current
3089	* phase is not MSGOUT.
3090	*/
3091
3092	/*
3093	* Return control to the executing NCR drive so we can clear the
3094	* aborted flag and get back into our main loop.
3095	*/
3096
3097	return 0;
3098	}
3099	#endif
3100
3101	/*
3102	* Case 2 : If the command hasn't been issued yet, we simply remove it
3103	* from the issue queue.
3104	*/
3105	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_ABORT)
3106	/* KLL */
3107	printk("scsi%d : abort going into loop.\n", instance->host_no);
3108	#endif
3109	for (prev = (Scsi_Cmnd **) &(hostdata->issue_queue),
3110	tmp = (Scsi_Cmnd *) hostdata->issue_queue;
3111	tmp; prev = (Scsi_Cmnd **) &(tmp->host_scribble), tmp =
3112	(Scsi_Cmnd *) tmp->host_scribble)
3113	if (cmd == tmp) {
3114	REMOVE(5,*prev,tmp,tmp->host_scribble);
3115	(prev) = (Scsi_Cmnd ) tmp->host_scribble;
3116	tmp->host_scribble = NULL((void *) 0);
3117	tmp->result = DID_ABORT0x05 << 16;
3118	sti()__asm__ __volatile__ ("sti": : :"memory");
3119	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_ABORT)
3120	printk("scsi%d : abort removed command from issue queue.\n",
3121	instance->host_no);
3122	#endif
3123	tmp->done(tmp);
3124	return SCSI_ABORT_SUCCESS1;
3125	}
3126	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_ABORT)
3127	/* KLL */
3128	else if (prev == tmp) printk("scsi%d : LOOP\n", instance->host_no);
3129	#endif
3130
3131	/*
3132	* Case 3 : If any commands are connected, we're going to fail the abort
3133	* and let the high level SCSI driver retry at a later time or
3134	* issue a reset.
3135	*
3136	* Timeouts, and therefore aborted commands, will be highly unlikely
3137	* and handling them cleanly in this situation would make the common
3138	* case of noresets less efficient, and would pollute our code. So,
3139	* we fail.
3140	*/
3141
3142	if (hostdata->connected) {
3143	sti()__asm__ __volatile__ ("sti": : :"memory");
3144	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_ABORT)
3145	printk("scsi%d : abort failed, command connected.\n", instance->host_no);
3146	#endif
3147	return SCSI_ABORT_NOT_RUNNING4;
3148	}
3149
3150	/*
3151	* Case 4: If the command is currently disconnected from the bus, and
3152	* there are no connected commands, we reconnect the I_T_L or
3153	* I_T_L_Q nexus associated with it, go into message out, and send
3154	* an abort message.
3155	*
3156	* This case is especially ugly. In order to reestablish the nexus, we
3157	* need to call NCR5380_select(). The easiest way to implement this
3158	* function was to abort if the bus was busy, and let the interrupt
3159	* handler triggered on the SEL for reselect take care of lost arbitrations
3160	* where necessary, meaning interrupts need to be enabled.
3161	*
3162	* When interrupts are enabled, the queues may change - so we
3163	* can't remove it from the disconnected queue before selecting it
3164	* because that could cause a failure in hashing the nexus if that
3165	* device reselected.
3166	*
3167	* Since the queues may change, we can't use the pointers from when we
3168	* first locate it.
3169	*
3170	* So, we must first locate the command, and if NCR5380_select()
3171	* succeeds, then issue the abort, relocate the command and remove
3172	* it from the disconnected queue.
3173	*/
3174
3175	for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp;
3176	tmp = (Scsi_Cmnd *) tmp->host_scribble)
3177	if (cmd == tmp) {
3178	sti()__asm__ __volatile__ ("sti": : :"memory");
3179	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_ABORT)
3180	printk("scsi%d : aborting disconnected command.\n", instance->host_no);
3181	#endif
3182
3183	if (NCR5380_select (instance, cmd, (int) cmd->tag))
3184	return SCSI_ABORT_BUSY3;
3185
3186	#if (NDEBUG(0x40000 \| NDEBUG_ABORT) & NDEBUG_ABORT)
3187	printk("scsi%d : nexus reestablished.\n", instance->host_no);
3188	#endif
3189
3190	do_abort (instance);
3191
3192	cli()__asm__ __volatile__ ("cli": : :"memory");
3193	for (prev = (Scsi_Cmnd **) &(hostdata->disconnected_queue),
3194	tmp = (Scsi_Cmnd *) hostdata->disconnected_queue;
3195	tmp; prev = (Scsi_Cmnd **) &(tmp->host_scribble), tmp =
3196	(Scsi_Cmnd *) tmp->host_scribble)
3197	if (cmd == tmp) {
3198	REMOVE(5,*prev,tmp,tmp->host_scribble);
3199	prev = (Scsi_Cmnd ) tmp->host_scribble;
3200	tmp->host_scribble = NULL((void *) 0);
3201	tmp->result = DID_ABORT0x05 << 16;
3202	sti()__asm__ __volatile__ ("sti": : :"memory");
3203	tmp->done(tmp);
3204	return SCSI_ABORT_SUCCESS1;
3205	}
3206	}
3207
3208	/*
3209	* Case 5 : If we reached this point, the command was not found in any of
3210	* the queues.
3211	*
3212	* We probably reached this point because of an unlikely race condition
3213	* between the command completing successfully and the abortion code,
3214	* so we won't panic, but we will notify the user in case something really
3215	* broke.
3216	*/
3217
3218	sti()__asm__ __volatile__ ("sti": : :"memory");
3219	printk("scsi%d : warning : SCSI command probably completed successfully\n"
3220	" before abortion\n", instance->host_no);
3221	return SCSI_ABORT_NOT_RUNNING4;
3222	}
3223
3224
3225	/*
3226	* Function : int NCR5380_reset (Scsi_Cmnd *cmd, unsigned int reset_flags)
3227	*
3228	* Purpose : reset the SCSI bus.
3229	*
3230	* Returns : SCSI_RESET_WAKEUP
3231	*
3232	*/
3233
3234	#ifndef NCR5380_resetdtc_reset
3235	static
3236	#endif
3237	int NCR5380_resetdtc_reset (Scsi_Cmnd *cmd, unsigned int dummy) {
3238	NCR5380_local_declare()volatile unsigned char *base;
3239	NCR5380_setup(cmd->host)base = (volatile unsigned char *) (cmd->host)->base;
3240
3241	NCR5380_print_status (cmd->host);
3242	do_reset (cmd->host);
3243
3244	return SCSI_RESET_WAKEUP4;
3245	}
3246