summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/qlogicfas408.c
blob: 1ad51552d6b188aba1e206d5dc8e2a2ae96622a9 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
/*----------------------------------------------------------------*/
/*
   Qlogic linux driver - work in progress. No Warranty express or implied.
   Use at your own risk.  Support Tort Reform so you won't have to read all
   these silly disclaimers.

   Copyright 1994, Tom Zerucha.   
   tz@execpc.com
   
   Additional Code, and much appreciated help by
   Michael A. Griffith
   grif@cs.ucr.edu

   Thanks to Eric Youngdale and Dave Hinds for loadable module and PCMCIA
   help respectively, and for suffering through my foolishness during the
   debugging process.

   Reference Qlogic FAS408 Technical Manual, 53408-510-00A, May 10, 1994
   (you can reference it, but it is incomplete and inaccurate in places)

   Version 0.46 1/30/97 - kernel 1.2.0+

   Functions as standalone, loadable, and PCMCIA driver, the latter from
   Dave Hinds' PCMCIA package.
   
   Cleaned up 26/10/2002 by Alan Cox <alan@lxorguk.ukuu.org.uk> as part of the 2.5
   SCSI driver cleanup and audit. This driver still needs work on the
   following
   	-	Non terminating hardware waits
   	-	Some layering violations with its pcmcia stub

   Redistributable under terms of the GNU General Public License

   For the avoidance of doubt the "preferred form" of this code is one which
   is in an open non patent encumbered format. Where cryptographic key signing
   forms part of the process of creating an executable the information
   including keys needed to generate an equivalently functional executable
   are deemed to be part of the source code.

*/

#include <linux/module.h>
#include <linux/blkdev.h>		/* to get disk capacity */
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/proc_fs.h>
#include <linux/unistd.h>
#include <linux/spinlock.h>
#include <linux/stat.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/dma.h>

#include "scsi.h"
#include <scsi/scsi_host.h>
#include "qlogicfas408.h"

/*----------------------------------------------------------------*/
static int qlcfg5 = (XTALFREQ << 5);	/* 15625/512 */
static int qlcfg6 = SYNCXFRPD;
static int qlcfg7 = SYNCOFFST;
static int qlcfg8 = (SLOWCABLE << 7) | (QL_ENABLE_PARITY << 4);
static int qlcfg9 = ((XTALFREQ + 4) / 5);
static int qlcfgc = (FASTCLK << 3) | (FASTSCSI << 4);

/*----------------------------------------------------------------*/

/*----------------------------------------------------------------*/
/* local functions */
/*----------------------------------------------------------------*/

/* error recovery - reset everything */

static void ql_zap(struct qlogicfas408_priv *priv)
{
	int x;
	int qbase = priv->qbase;
	int int_type = priv->int_type;

	x = inb(qbase + 0xd);
	REG0;
	outb(3, qbase + 3);	/* reset SCSI */
	outb(2, qbase + 3);	/* reset chip */
	if (x & 0x80)
		REG1;
}

/*
 *	Do a pseudo-dma tranfer
 */
 
static int ql_pdma(struct qlogicfas408_priv *priv, int phase, char *request, int reqlen)
{
	int j;
	int qbase = priv->qbase;
	j = 0;
	if (phase & 1) {	/* in */
#if QL_TURBO_PDMA
		rtrc(4)
		/* empty fifo in large chunks */
		if (reqlen >= 128 && (inb(qbase + 8) & 2)) {	/* full */
			insl(qbase + 4, request, 32);
			reqlen -= 128;
			request += 128;
		}
		while (reqlen >= 84 && !(j & 0xc0))	/* 2/3 */
			if ((j = inb(qbase + 8)) & 4) 
			{
				insl(qbase + 4, request, 21);
				reqlen -= 84;
				request += 84;
			}
		if (reqlen >= 44 && (inb(qbase + 8) & 8)) {	/* 1/3 */
			insl(qbase + 4, request, 11);
			reqlen -= 44;
			request += 44;
		}
#endif
		/* until both empty and int (or until reclen is 0) */
		rtrc(7)
		j = 0;
		while (reqlen && !((j & 0x10) && (j & 0xc0))) 
		{
			/* while bytes to receive and not empty */
			j &= 0xc0;
			while (reqlen && !((j = inb(qbase + 8)) & 0x10)) 
			{
				*request++ = inb(qbase + 4);
				reqlen--;
			}
			if (j & 0x10)
				j = inb(qbase + 8);

		}
	} else {		/* out */
#if QL_TURBO_PDMA
		rtrc(4)
		    if (reqlen >= 128 && inb(qbase + 8) & 0x10) {	/* empty */
			outsl(qbase + 4, request, 32);
			reqlen -= 128;
			request += 128;
		}
		while (reqlen >= 84 && !(j & 0xc0))	/* 1/3 */
			if (!((j = inb(qbase + 8)) & 8)) {
				outsl(qbase + 4, request, 21);
				reqlen -= 84;
				request += 84;
			}
		if (reqlen >= 40 && !(inb(qbase + 8) & 4)) {	/* 2/3 */
			outsl(qbase + 4, request, 10);
			reqlen -= 40;
			request += 40;
		}
#endif
		/* until full and int (or until reclen is 0) */
		rtrc(7)
		    j = 0;
		while (reqlen && !((j & 2) && (j & 0xc0))) {
			/* while bytes to send and not full */
			while (reqlen && !((j = inb(qbase + 8)) & 2)) 
			{
				outb(*request++, qbase + 4);
				reqlen--;
			}
			if (j & 2)
				j = inb(qbase + 8);
		}
	}
	/* maybe return reqlen */
	return inb(qbase + 8) & 0xc0;
}

/*
 *	Wait for interrupt flag (polled - not real hardware interrupt) 
 */

static int ql_wai(struct qlogicfas408_priv *priv)
{
	int k;
	int qbase = priv->qbase;
	unsigned long i;

	k = 0;
	i = jiffies + WATCHDOG;
	while (time_before(jiffies, i) && !priv->qabort &&
					!((k = inb(qbase + 4)) & 0xe0)) {
		barrier();
		cpu_relax();
	}
	if (time_after_eq(jiffies, i))
		return (DID_TIME_OUT);
	if (priv->qabort)
		return (priv->qabort == 1 ? DID_ABORT : DID_RESET);
	if (k & 0x60)
		ql_zap(priv);
	if (k & 0x20)
		return (DID_PARITY);
	if (k & 0x40)
		return (DID_ERROR);
	return 0;
}

/*
 *	Initiate scsi command - queueing handler 
 *	caller must hold host lock
 */

static void ql_icmd(struct scsi_cmnd *cmd)
{
	struct qlogicfas408_priv *priv = get_priv_by_cmd(cmd);
	int 	qbase = priv->qbase;
	int	int_type = priv->int_type;
	unsigned int i;

	priv->qabort = 0;

	REG0;
	/* clearing of interrupts and the fifo is needed */

	inb(qbase + 5);		/* clear interrupts */
	if (inb(qbase + 5))	/* if still interrupting */
		outb(2, qbase + 3);	/* reset chip */
	else if (inb(qbase + 7) & 0x1f)
		outb(1, qbase + 3);	/* clear fifo */
	while (inb(qbase + 5));	/* clear ints */
	REG1;
	outb(1, qbase + 8);	/* set for PIO pseudo DMA */
	outb(0, qbase + 0xb);	/* disable ints */
	inb(qbase + 8);		/* clear int bits */
	REG0;
	outb(0x40, qbase + 0xb);	/* enable features */

	/* configurables */
	outb(qlcfgc, qbase + 0xc);
	/* config: no reset interrupt, (initiator) bus id */
	outb(0x40 | qlcfg8 | priv->qinitid, qbase + 8);
	outb(qlcfg7, qbase + 7);
	outb(qlcfg6, qbase + 6);
	 /**/ outb(qlcfg5, qbase + 5);	/* select timer */
	outb(qlcfg9 & 7, qbase + 9);	/* prescaler */
/*	outb(0x99, qbase + 5);	*/
	outb(scmd_id(cmd), qbase + 4);

	for (i = 0; i < cmd->cmd_len; i++)
		outb(cmd->cmnd[i], qbase + 2);

	priv->qlcmd = cmd;
	outb(0x41, qbase + 3);	/* select and send command */
}

/*
 *	Process scsi command - usually after interrupt 
 */

static unsigned int ql_pcmd(struct scsi_cmnd *cmd)
{
	unsigned int i, j;
	unsigned long k;
	unsigned int result;	/* ultimate return result */
	unsigned int status;	/* scsi returned status */
	unsigned int message;	/* scsi returned message */
	unsigned int phase;	/* recorded scsi phase */
	unsigned int reqlen;	/* total length of transfer */
	char *buf;
	struct qlogicfas408_priv *priv = get_priv_by_cmd(cmd);
	int qbase = priv->qbase;
	int int_type = priv->int_type;

	rtrc(1)
	j = inb(qbase + 6);
	i = inb(qbase + 5);
	if (i == 0x20) {
		return (DID_NO_CONNECT << 16);
	}
	i |= inb(qbase + 5);	/* the 0x10 bit can be set after the 0x08 */
	if (i != 0x18) {
		printk(KERN_ERR "Ql:Bad Interrupt status:%02x\n", i);
		ql_zap(priv);
		return (DID_BAD_INTR << 16);
	}
	j &= 7;			/* j = inb( qbase + 7 ) >> 5; */

	/* correct status is supposed to be step 4 */
	/* it sometimes returns step 3 but with 0 bytes left to send */
	/* We can try stuffing the FIFO with the max each time, but we will get a
	   sequence of 3 if any bytes are left (but we do flush the FIFO anyway */

	if (j != 3 && j != 4) {
		printk(KERN_ERR "Ql:Bad sequence for command %d, int %02X, cmdleft = %d\n",
		     j, i, inb(qbase + 7) & 0x1f);
		ql_zap(priv);
		return (DID_ERROR << 16);
	}
	result = DID_OK;
	if (inb(qbase + 7) & 0x1f)	/* if some bytes in fifo */
		outb(1, qbase + 3);	/* clear fifo */
	/* note that request_bufflen is the total xfer size when sg is used */
	reqlen = scsi_bufflen(cmd);
	/* note that it won't work if transfers > 16M are requested */
	if (reqlen && !((phase = inb(qbase + 4)) & 6)) {	/* data phase */
		struct scatterlist *sg;
		rtrc(2)
		outb(reqlen, qbase);	/* low-mid xfer cnt */
		outb(reqlen >> 8, qbase + 1);	/* low-mid xfer cnt */
		outb(reqlen >> 16, qbase + 0xe);	/* high xfer cnt */
		outb(0x90, qbase + 3);	/* command do xfer */
		/* PIO pseudo DMA to buffer or sglist */
		REG1;

		scsi_for_each_sg(cmd, sg, scsi_sg_count(cmd), i) {
			if (priv->qabort) {
				REG0;
				return ((priv->qabort == 1 ?
					 DID_ABORT : DID_RESET) << 16);
			}
			buf = sg_virt(sg);
			if (ql_pdma(priv, phase, buf, sg->length))
				break;
		}
		REG0;
		rtrc(2)
		/*
		 *	Wait for irq (split into second state of irq handler
		 *	if this can take time) 
		 */
		if ((k = ql_wai(priv)))
			return (k << 16);
		k = inb(qbase + 5);	/* should be 0x10, bus service */
	}

	/*
	 *	Enter Status (and Message In) Phase 
	 */
	 
	k = jiffies + WATCHDOG;

	while (time_before(jiffies, k) && !priv->qabort &&
						!(inb(qbase + 4) & 6))
		cpu_relax();	/* wait for status phase */

	if (time_after_eq(jiffies, k)) {
		ql_zap(priv);
		return (DID_TIME_OUT << 16);
	}

	/* FIXME: timeout ?? */
	while (inb(qbase + 5))
		cpu_relax();	/* clear pending ints */

	if (priv->qabort)
		return ((priv->qabort == 1 ? DID_ABORT : DID_RESET) << 16);

	outb(0x11, qbase + 3);	/* get status and message */
	if ((k = ql_wai(priv)))
		return (k << 16);
	i = inb(qbase + 5);	/* get chip irq stat */
	j = inb(qbase + 7) & 0x1f;	/* and bytes rec'd */
	status = inb(qbase + 2);
	message = inb(qbase + 2);

	/*
	 *	Should get function complete int if Status and message, else 
	 *	bus serv if only status 
	 */
	if (!((i == 8 && j == 2) || (i == 0x10 && j == 1))) {
		printk(KERN_ERR "Ql:Error during status phase, int=%02X, %d bytes recd\n", i, j);
		result = DID_ERROR;
	}
	outb(0x12, qbase + 3);	/* done, disconnect */
	rtrc(1)
	if ((k = ql_wai(priv)))
		return (k << 16);

	/*
	 *	Should get bus service interrupt and disconnect interrupt 
	 */
	 
	i = inb(qbase + 5);	/* should be bus service */
	while (!priv->qabort && ((i & 0x20) != 0x20)) {
		barrier();
		cpu_relax();
		i |= inb(qbase + 5);
	}
	rtrc(0)

	if (priv->qabort)
		return ((priv->qabort == 1 ? DID_ABORT : DID_RESET) << 16);
		
	return (result << 16) | (message << 8) | (status & STATUS_MASK);
}

/*
 *	Interrupt handler 
 */

static void ql_ihandl(void *dev_id)
{
	struct scsi_cmnd *icmd;
	struct Scsi_Host *host = dev_id;
	struct qlogicfas408_priv *priv = get_priv_by_host(host);
	int qbase = priv->qbase;
	REG0;

	if (!(inb(qbase + 4) & 0x80))	/* false alarm? */
		return;

	if (priv->qlcmd == NULL) {	/* no command to process? */
		int i;
		i = 16;
		while (i-- && inb(qbase + 5));	/* maybe also ql_zap() */
		return;
	}
	icmd = priv->qlcmd;
	icmd->result = ql_pcmd(icmd);
	priv->qlcmd = NULL;
	/*
	 *	If result is CHECK CONDITION done calls qcommand to request 
	 *	sense 
	 */
	(icmd->scsi_done) (icmd);
}

irqreturn_t qlogicfas408_ihandl(int irq, void *dev_id)
{
	unsigned long flags;
	struct Scsi_Host *host = dev_id;

	spin_lock_irqsave(host->host_lock, flags);
	ql_ihandl(dev_id);
	spin_unlock_irqrestore(host->host_lock, flags);
	return IRQ_HANDLED;
}

/*
 *	Queued command
 */

int qlogicfas408_queuecommand(struct scsi_cmnd *cmd,
			      void (*done) (struct scsi_cmnd *))
{
	struct qlogicfas408_priv *priv = get_priv_by_cmd(cmd);
	if (scmd_id(cmd) == priv->qinitid) {
		cmd->result = DID_BAD_TARGET << 16;
		done(cmd);
		return 0;
	}

	cmd->scsi_done = done;
	/* wait for the last command's interrupt to finish */
	while (priv->qlcmd != NULL) {
		barrier();
		cpu_relax();
	}
	ql_icmd(cmd);
	return 0;
}

/* 
 *	Return bios parameters 
 */

int qlogicfas408_biosparam(struct scsi_device *disk, struct block_device *dev,
			   sector_t capacity, int ip[])
{
/* This should mimic the DOS Qlogic driver's behavior exactly */
	ip[0] = 0x40;
	ip[1] = 0x20;
	ip[2] = (unsigned long) capacity / (ip[0] * ip[1]);
	if (ip[2] > 1024) {
		ip[0] = 0xff;
		ip[1] = 0x3f;
		ip[2] = (unsigned long) capacity / (ip[0] * ip[1]);
#if 0
		if (ip[2] > 1023)
			ip[2] = 1023;
#endif
	}
	return 0;
}

/*
 *	Abort a command in progress
 */
 
int qlogicfas408_abort(struct scsi_cmnd *cmd)
{
	struct qlogicfas408_priv *priv = get_priv_by_cmd(cmd);
	priv->qabort = 1;
	ql_zap(priv);
	return SUCCESS;
}

/* 
 *	Reset SCSI bus
 *	FIXME: This function is invoked with cmd = NULL directly by
 *	the PCMCIA qlogic_stub code. This wants fixing
 */

int qlogicfas408_bus_reset(struct scsi_cmnd *cmd)
{
	struct qlogicfas408_priv *priv = get_priv_by_cmd(cmd);
	unsigned long flags;

	priv->qabort = 2;

	spin_lock_irqsave(cmd->device->host->host_lock, flags);
	ql_zap(priv);
	spin_unlock_irqrestore(cmd->device->host->host_lock, flags);

	return SUCCESS;
}

/*
 *	Return info string
 */

const char *qlogicfas408_info(struct Scsi_Host *host)
{
	struct qlogicfas408_priv *priv = get_priv_by_host(host);
	return priv->qinfo;
}

/*
 *	Get type of chip
 */

int qlogicfas408_get_chip_type(int qbase, int int_type)
{
	REG1;
	return inb(qbase + 0xe) & 0xf8;
}

/*
 *	Perform initialization tasks
 */

void qlogicfas408_setup(int qbase, int id, int int_type)
{
	outb(1, qbase + 8);	/* set for PIO pseudo DMA */
	REG0;
	outb(0x40 | qlcfg8 | id, qbase + 8);	/* (ini) bus id, disable scsi rst */
	outb(qlcfg5, qbase + 5);	/* select timer */
	outb(qlcfg9, qbase + 9);	/* prescaler */

#if QL_RESET_AT_START
	outb(3, qbase + 3);

	REG1;
	/* FIXME: timeout */
	while (inb(qbase + 0xf) & 4)
		cpu_relax();

	REG0;
#endif
}

/*
 *	Checks if this is a QLogic FAS 408
 */

int qlogicfas408_detect(int qbase, int int_type)
{
        REG1;
	return (((inb(qbase + 0xe) ^ inb(qbase + 0xe)) == 7) &&
	       ((inb(qbase + 0xe) ^ inb(qbase + 0xe)) == 7));		
}

/*
 *	Disable interrupts
 */

void qlogicfas408_disable_ints(struct qlogicfas408_priv *priv)
{
	int qbase = priv->qbase;
	int int_type = priv->int_type;

	REG1;
	outb(0, qbase + 0xb);	/* disable ints */
}

/*
 *	Init and exit functions
 */

static int __init qlogicfas408_init(void)
{
	return 0;
}

static void __exit qlogicfas408_exit(void)
{

}

MODULE_AUTHOR("Tom Zerucha, Michael Griffith");
MODULE_DESCRIPTION("Driver for the Qlogic FAS SCSI controllers");
MODULE_LICENSE("GPL");
module_init(qlogicfas408_init);
module_exit(qlogicfas408_exit);

EXPORT_SYMBOL(qlogicfas408_info);
EXPORT_SYMBOL(qlogicfas408_queuecommand);
EXPORT_SYMBOL(qlogicfas408_abort);
EXPORT_SYMBOL(qlogicfas408_bus_reset);
EXPORT_SYMBOL(qlogicfas408_biosparam);
EXPORT_SYMBOL(qlogicfas408_ihandl);
EXPORT_SYMBOL(qlogicfas408_get_chip_type);
EXPORT_SYMBOL(qlogicfas408_setup);
EXPORT_SYMBOL(qlogicfas408_detect);
EXPORT_SYMBOL(qlogicfas408_disable_ints);