aboutsummaryrefslogtreecommitdiff
path: root/drivers/ide/legacy/qd65xx.c
blob: d1414a75b52371d707aa5375ec5ee4b1221e2ca5 (plain)
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
/*
 *  linux/drivers/ide/legacy/qd65xx.c		Version 0.07	Sep 30, 2001
 *
 *  Copyright (C) 1996-2001  Linus Torvalds & author (see below)
 */

/*
 *  Version 0.03	Cleaned auto-tune, added probe
 *  Version 0.04	Added second channel tuning
 *  Version 0.05	Enhanced tuning ; added qd6500 support
 *  Version 0.06	Added dos driver's list
 *  Version 0.07	Second channel bug fix 
 *
 * QDI QD6500/QD6580 EIDE controller fast support
 *
 * Please set local bus speed using kernel parameter idebus
 * 	for example, "idebus=33" stands for 33Mhz VLbus
 * To activate controller support, use "ide0=qd65xx"
 * To enable tuning, use "hda=autotune hdb=autotune"
 * To enable 2nd channel tuning (qd6580 only), use "hdc=autotune hdd=autotune"
 */

/*
 * Rewritten from the work of Colten Edwards <pje120@cs.usask.ca> by
 * Samuel Thibault <samuel.thibault@fnac.net>
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/blkdev.h>
#include <linux/hdreg.h>
#include <linux/ide.h>
#include <linux/init.h>
#include <asm/system.h>
#include <asm/io.h>

#include "qd65xx.h"

/*
 * I/O ports are 0x30-0x31 (and 0x32-0x33 for qd6580)
 *            or 0xb0-0xb1 (and 0xb2-0xb3 for qd6580)
 *	-- qd6500 is a single IDE interface
 *	-- qd6580 is a dual IDE interface
 *
 * More research on qd6580 being done by willmore@cig.mot.com (David)
 * More Information given by Petr Soucek (petr@ryston.cz)
 * http://www.ryston.cz/petr/vlb
 */

/*
 * base: Timer1
 *
 *
 * base+0x01: Config (R/O)
 *
 * bit 0: ide baseport: 1 = 0x1f0 ; 0 = 0x170 (only useful for qd6500)
 * bit 1: qd65xx baseport: 1 = 0xb0 ; 0 = 0x30
 * bit 2: ID3: bus speed: 1 = <=33MHz ; 0 = >33MHz
 * bit 3: qd6500: 1 = disabled, 0 = enabled
 *        qd6580: 1
 * upper nibble:
 *        qd6500: 1100
 *        qd6580: either 1010 or 0101
 *
 *
 * base+0x02: Timer2 (qd6580 only)
 *
 *
 * base+0x03: Control (qd6580 only)
 *
 * bits 0-3 must always be set 1
 * bit 4 must be set 1, but is set 0 by dos driver while measuring vlb clock
 * bit 0 : 1 = Only primary port enabled : channel 0 for hda, channel 1 for hdb
 *         0 = Primary and Secondary ports enabled : channel 0 for hda & hdb
 *                                                   channel 1 for hdc & hdd
 * bit 1 : 1 = only disks on primary port
 *         0 = disks & ATAPI devices on primary port
 * bit 2-4 : always 0
 * bit 5 : status, but of what ?
 * bit 6 : always set 1 by dos driver
 * bit 7 : set 1 for non-ATAPI devices on primary port
 *	(maybe read-ahead and post-write buffer ?)
 */

static int timings[4]={-1,-1,-1,-1}; /* stores current timing for each timer */

static void qd_write_reg (u8 content, unsigned long reg)
{
	unsigned long flags;

	spin_lock_irqsave(&ide_lock, flags);
	outb(content,reg);
	spin_unlock_irqrestore(&ide_lock, flags);
}

static u8 __init qd_read_reg (unsigned long reg)
{
	unsigned long flags;
	u8 read;

	spin_lock_irqsave(&ide_lock, flags);
	read = inb(reg);
	spin_unlock_irqrestore(&ide_lock, flags);
	return read;
}

/*
 * qd_select:
 *
 * This routine is invoked from ide.c to prepare for access to a given drive.
 */

static void qd_select (ide_drive_t *drive)
{
	u8 index = ((	(QD_TIMREG(drive)) & 0x80 ) >> 7) |
			(QD_TIMREG(drive) & 0x02);

	if (timings[index] != QD_TIMING(drive))
		qd_write_reg(timings[index] = QD_TIMING(drive), QD_TIMREG(drive));
}

/*
 * qd6500_compute_timing
 *
 * computes the timing value where
 *	lower nibble represents active time,   in count of VLB clocks
 *	upper nibble represents recovery time, in count of VLB clocks
 */

static u8 qd6500_compute_timing (ide_hwif_t *hwif, int active_time, int recovery_time)
{
	u8 active_cycle,recovery_cycle;

	if (system_bus_clock()<=33) {
		active_cycle =   9  - IDE_IN(active_time   * system_bus_clock() / 1000 + 1, 2, 9);
		recovery_cycle = 15 - IDE_IN(recovery_time * system_bus_clock() / 1000 + 1, 0, 15);
	} else {
		active_cycle =   8  - IDE_IN(active_time   * system_bus_clock() / 1000 + 1, 1, 8);
		recovery_cycle = 18 - IDE_IN(recovery_time * system_bus_clock() / 1000 + 1, 3, 18);
	}

	return((recovery_cycle<<4) | 0x08 | active_cycle);
}

/*
 * qd6580_compute_timing
 *
 * idem for qd6580
 */

static u8 qd6580_compute_timing (int active_time, int recovery_time)
{
	u8 active_cycle   = 17 - IDE_IN(active_time   * system_bus_clock() / 1000 + 1, 2, 17);
	u8 recovery_cycle = 15 - IDE_IN(recovery_time * system_bus_clock() / 1000 + 1, 2, 15);

	return((recovery_cycle<<4) | active_cycle);
}

/*
 * qd_find_disk_type
 *
 * tries to find timing from dos driver's table
 */

static int qd_find_disk_type (ide_drive_t *drive,
		int *active_time, int *recovery_time)
{
	struct qd65xx_timing_s *p;
	char model[40];

	if (!*drive->id->model) return 0;

	strncpy(model,drive->id->model,40);
	ide_fixstring(model,40,1); /* byte-swap */

	for (p = qd65xx_timing ; p->offset != -1 ; p++) {
		if (!strncmp(p->model, model+p->offset, 4)) {
			printk(KERN_DEBUG "%s: listed !\n", drive->name);
			*active_time = p->active;
			*recovery_time = p->recovery;
			return 1;
		}
	}
	return 0;
}

/*
 * qd_timing_ok:
 *
 * check whether timings don't conflict
 */

static int qd_timing_ok (ide_drive_t drives[])
{
	return (IDE_IMPLY(drives[0].present && drives[1].present,
			IDE_IMPLY(QD_TIMREG(drives) == QD_TIMREG(drives+1),
			          QD_TIMING(drives) == QD_TIMING(drives+1))));
	/* if same timing register, must be same timing */
}

/*
 * qd_set_timing:
 *
 * records the timing, and enables selectproc as needed
 */

static void qd_set_timing (ide_drive_t *drive, u8 timing)
{
	ide_hwif_t *hwif = HWIF(drive);

	drive->drive_data &= 0xff00;
	drive->drive_data |= timing;
	if (qd_timing_ok(hwif->drives)) {
		qd_select(drive); /* selects once */
		hwif->selectproc = NULL;
	} else
		hwif->selectproc = &qd_select;

	printk(KERN_DEBUG "%s: %#x\n", drive->name, timing);
}

/*
 * qd6500_tune_drive
 */

static void qd6500_tune_drive (ide_drive_t *drive, u8 pio)
{
	int active_time   = 175;
	int recovery_time = 415; /* worst case values from the dos driver */

	if (drive->id && !qd_find_disk_type(drive, &active_time, &recovery_time)
		&& drive->id->tPIO && (drive->id->field_valid & 0x02)
		&& drive->id->eide_pio >= 240) {

		printk(KERN_INFO "%s: PIO mode%d\n", drive->name,
				drive->id->tPIO);
		active_time = 110;
		recovery_time = drive->id->eide_pio - 120;
	}

	qd_set_timing(drive, qd6500_compute_timing(HWIF(drive), active_time, recovery_time));
}

/*
 * qd6580_tune_drive
 */

static void qd6580_tune_drive (ide_drive_t *drive, u8 pio)
{
	ide_pio_data_t d;
	int base = HWIF(drive)->select_data;
	int active_time   = 175;
	int recovery_time = 415; /* worst case values from the dos driver */

	if (drive->id && !qd_find_disk_type(drive, &active_time, &recovery_time)) {
		pio = ide_get_best_pio_mode(drive, pio, 255, &d);
		pio = min_t(u8, pio, 4);

		switch (pio) {
			case 0: break;
			case 3:
				if (d.cycle_time >= 110) {
					active_time = 86;
					recovery_time = d.cycle_time - 102;
				} else
					printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
				break;
			case 4:
				if (d.cycle_time >= 69) {
					active_time = 70;
					recovery_time = d.cycle_time - 61;
				} else
					printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
				break;
			default:
				if (d.cycle_time >= 180) {
					active_time = 110;
					recovery_time = d.cycle_time - 120;
				} else {
					active_time = ide_pio_timings[pio].active_time;
					recovery_time = d.cycle_time
							-active_time;
				}
		}
		printk(KERN_INFO "%s: PIO mode%d\n", drive->name,pio);
	}

	if (!HWIF(drive)->channel && drive->media != ide_disk) {
		qd_write_reg(0x5f, QD_CONTROL_PORT);
		printk(KERN_WARNING "%s: ATAPI: disabled read-ahead FIFO "
			"and post-write buffer on %s.\n",
			drive->name, HWIF(drive)->name);
	}

	qd_set_timing(drive, qd6580_compute_timing(active_time, recovery_time));
}

/*
 * qd_testreg
 *
 * tests if the given port is a register
 */

static int __init qd_testreg(int port)
{
	u8 savereg;
	u8 readreg;
	unsigned long flags;

	spin_lock_irqsave(&ide_lock, flags);
	savereg = inb_p(port);
	outb_p(QD_TESTVAL, port);	/* safe value */
	readreg = inb_p(port);
	outb(savereg, port);
	spin_unlock_irqrestore(&ide_lock, flags);

	if (savereg == QD_TESTVAL) {
		printk(KERN_ERR "Outch ! the probe for qd65xx isn't reliable !\n");
		printk(KERN_ERR "Please contact maintainers to tell about your hardware\n");
		printk(KERN_ERR "Assuming qd65xx is not present.\n");
		return 1;
	}

	return (readreg != QD_TESTVAL);
}

/*
 * qd_setup:
 *
 * called to setup an ata channel : adjusts attributes & links for tuning
 */

static void __init qd_setup(ide_hwif_t *hwif, int base, int config,
			    unsigned int data0, unsigned int data1,
			    void (*tuneproc) (ide_drive_t *, u8 pio))
{
	hwif->chipset = ide_qd65xx;
	hwif->channel = hwif->index;
	hwif->select_data = base;
	hwif->config_data = config;
	hwif->drives[0].drive_data = data0;
	hwif->drives[1].drive_data = data1;
	hwif->drives[0].io_32bit =
	hwif->drives[1].io_32bit = 1;
	hwif->tuneproc = tuneproc;
	probe_hwif_init(hwif);
}

/*
 * qd_unsetup:
 *
 * called to unsetup an ata channel : back to default values, unlinks tuning
 */
/*
static void __exit qd_unsetup(ide_hwif_t *hwif)
{
	u8 config = hwif->config_data;
	int base = hwif->select_data;
	void *tuneproc = (void *) hwif->tuneproc;

	if (hwif->chipset != ide_qd65xx)
		return;

	printk(KERN_NOTICE "%s: back to defaults\n", hwif->name);

	hwif->selectproc = NULL;
	hwif->tuneproc = NULL;

	if (tuneproc == (void *) qd6500_tune_drive) {
		// will do it for both
		qd_write_reg(QD6500_DEF_DATA, QD_TIMREG(&hwif->drives[0]));
	} else if (tuneproc == (void *) qd6580_tune_drive) {
		if (QD_CONTROL(hwif) & QD_CONTR_SEC_DISABLED) {
			qd_write_reg(QD6580_DEF_DATA, QD_TIMREG(&hwif->drives[0]));
			qd_write_reg(QD6580_DEF_DATA2, QD_TIMREG(&hwif->drives[1]));
		} else {
			qd_write_reg(hwif->channel ? QD6580_DEF_DATA2 : QD6580_DEF_DATA, QD_TIMREG(&hwif->drives[0]));
		}
	} else {
		printk(KERN_WARNING "Unknown qd65xx tuning fonction !\n");
		printk(KERN_WARNING "keeping settings !\n");
	}
}
*/

/*
 * qd_probe:
 *
 * looks at the specified baseport, and if qd found, registers & initialises it
 * return 1 if another qd may be probed
 */

static int __init qd_probe(int base)
{
	ide_hwif_t *hwif;
	u8 config;
	u8 unit;

	config = qd_read_reg(QD_CONFIG_PORT);

	if (! ((config & QD_CONFIG_BASEPORT) >> 1 == (base == 0xb0)) )
		return 1;

	unit = ! (config & QD_CONFIG_IDE_BASEPORT);

	if ((config & 0xf0) == QD_CONFIG_QD6500) {

		if (qd_testreg(base)) return 1;		/* bad register */

		/* qd6500 found */

		hwif = &ide_hwifs[unit];
		printk(KERN_NOTICE "%s: qd6500 at %#x\n", hwif->name, base);
		printk(KERN_DEBUG "qd6500: config=%#x, ID3=%u\n",
			config, QD_ID3);
		
		if (config & QD_CONFIG_DISABLED) {
			printk(KERN_WARNING "qd6500 is disabled !\n");
			return 1;
		}

		qd_setup(hwif, base, config, QD6500_DEF_DATA, QD6500_DEF_DATA,
			 &qd6500_tune_drive);

		ide_proc_register_port(hwif);

		return 1;
	}

	if (((config & 0xf0) == QD_CONFIG_QD6580_A) ||
	    ((config & 0xf0) == QD_CONFIG_QD6580_B)) {

		u8 control;

		if (qd_testreg(base) || qd_testreg(base+0x02)) return 1;
			/* bad registers */

		/* qd6580 found */

		control = qd_read_reg(QD_CONTROL_PORT);

		printk(KERN_NOTICE "qd6580 at %#x\n", base);
		printk(KERN_DEBUG "qd6580: config=%#x, control=%#x, ID3=%u\n",
			config, control, QD_ID3);

		if (control & QD_CONTR_SEC_DISABLED) {
			/* secondary disabled */

			hwif = &ide_hwifs[unit];
			printk(KERN_INFO "%s: qd6580: single IDE board\n",
					 hwif->name);
			qd_setup(hwif, base, config | (control << 8),
				 QD6580_DEF_DATA, QD6580_DEF_DATA2,
				 &qd6580_tune_drive);
			qd_write_reg(QD_DEF_CONTR,QD_CONTROL_PORT);

			ide_proc_register_port(hwif);

			return 1;
		} else {
			ide_hwif_t *mate;

			hwif = &ide_hwifs[0];
			mate = &ide_hwifs[1];
			/* secondary enabled */
			printk(KERN_INFO "%s&%s: qd6580: dual IDE board\n",
					hwif->name, mate->name);

			qd_setup(hwif, base, config | (control << 8),
				 QD6580_DEF_DATA, QD6580_DEF_DATA,
				 &qd6580_tune_drive);
			qd_setup(mate, base, config | (control << 8),
				 QD6580_DEF_DATA2, QD6580_DEF_DATA2,
				 &qd6580_tune_drive);
			qd_write_reg(QD_DEF_CONTR,QD_CONTROL_PORT);

			ide_proc_register_port(hwif);
			ide_proc_register_port(mate);

			return 0; /* no other qd65xx possible */
		}
	}
	/* no qd65xx found */
	return 1;
}

int probe_qd65xx = 0;

module_param_named(probe, probe_qd65xx, bool, 0);
MODULE_PARM_DESC(probe, "probe for QD65xx chipsets");

/* Can be called directly from ide.c. */
int __init qd65xx_init(void)
{
	if (probe_qd65xx == 0)
		return -ENODEV;

	if (qd_probe(0x30))
		qd_probe(0xb0);
	if (ide_hwifs[0].chipset != ide_qd65xx &&
	    ide_hwifs[1].chipset != ide_qd65xx)
		return -ENODEV;
	return 0;
}

#ifdef MODULE
module_init(qd65xx_init);
#endif

MODULE_AUTHOR("Samuel Thibault");
MODULE_DESCRIPTION("support of qd65xx vlb ide chipset");
MODULE_LICENSE("GPL");