qd65xx.c revision 5193535517825f9a07967e4868a1103013d0a99d 
1/*
2 *  Copyright (C) 1996-2001  Linus Torvalds & author (see below)
3 */
4
5/*
6 *  Version 0.03	Cleaned auto-tune, added probe
7 *  Version 0.04	Added second channel tuning
8 *  Version 0.05	Enhanced tuning ; added qd6500 support
9 *  Version 0.06	Added dos driver's list
10 *  Version 0.07	Second channel bug fix
11 *
12 * QDI QD6500/QD6580 EIDE controller fast support
13 *
14 * To activate controller support, use "ide0=qd65xx"
15 */
16
17/*
18 * Rewritten from the work of Colten Edwards <pje120@cs.usask.ca> by
19 * Samuel Thibault <samuel.thibault@ens-lyon.org>
20 */
21
22#include <linux/module.h>
23#include <linux/types.h>
24#include <linux/kernel.h>
25#include <linux/delay.h>
26#include <linux/timer.h>
27#include <linux/mm.h>
28#include <linux/ioport.h>
29#include <linux/blkdev.h>
30#include <linux/ide.h>
31#include <linux/init.h>
32#include <asm/system.h>
33#include <asm/io.h>
34
35#define DRV_NAME "qd65xx"
36
37#include "qd65xx.h"
38
39/*
40 * I/O ports are 0x30-0x31 (and 0x32-0x33 for qd6580)
41 *            or 0xb0-0xb1 (and 0xb2-0xb3 for qd6580)
42 *	-- qd6500 is a single IDE interface
43 *	-- qd6580 is a dual IDE interface
44 *
45 * More research on qd6580 being done by willmore@cig.mot.com (David)
46 * More Information given by Petr Soucek (petr@ryston.cz)
47 * http://www.ryston.cz/petr/vlb
48 */
49
50/*
51 * base: Timer1
52 *
53 *
54 * base+0x01: Config (R/O)
55 *
56 * bit 0: ide baseport: 1 = 0x1f0 ; 0 = 0x170 (only useful for qd6500)
57 * bit 1: qd65xx baseport: 1 = 0xb0 ; 0 = 0x30
58 * bit 2: ID3: bus speed: 1 = <=33MHz ; 0 = >33MHz
59 * bit 3: qd6500: 1 = disabled, 0 = enabled
60 *        qd6580: 1
61 * upper nibble:
62 *        qd6500: 1100
63 *        qd6580: either 1010 or 0101
64 *
65 *
66 * base+0x02: Timer2 (qd6580 only)
67 *
68 *
69 * base+0x03: Control (qd6580 only)
70 *
71 * bits 0-3 must always be set 1
72 * bit 4 must be set 1, but is set 0 by dos driver while measuring vlb clock
73 * bit 0 : 1 = Only primary port enabled : channel 0 for hda, channel 1 for hdb
74 *         0 = Primary and Secondary ports enabled : channel 0 for hda & hdb
75 *                                                   channel 1 for hdc & hdd
76 * bit 1 : 1 = only disks on primary port
77 *         0 = disks & ATAPI devices on primary port
78 * bit 2-4 : always 0
79 * bit 5 : status, but of what ?
80 * bit 6 : always set 1 by dos driver
81 * bit 7 : set 1 for non-ATAPI devices on primary port
82 *	(maybe read-ahead and post-write buffer ?)
83 */
84
85static int timings[4]={-1,-1,-1,-1}; /* stores current timing for each timer */
86
87/*
88 * qd65xx_select:
89 *
90 * This routine is invoked to prepare for access to a given drive.
91 */
92
93static void qd65xx_select(ide_drive_t *drive)
94{
95	u8 index = ((	(QD_TIMREG(drive)) & 0x80 ) >> 7) |
96			(QD_TIMREG(drive) & 0x02);
97
98	if (timings[index] != QD_TIMING(drive))
99		outb(timings[index] = QD_TIMING(drive), QD_TIMREG(drive));
100}
101
102/*
103 * qd6500_compute_timing
104 *
105 * computes the timing value where
106 *	lower nibble represents active time,   in count of VLB clocks
107 *	upper nibble represents recovery time, in count of VLB clocks
108 */
109
110static u8 qd6500_compute_timing (ide_hwif_t *hwif, int active_time, int recovery_time)
111{
112	int clk = ide_vlb_clk ? ide_vlb_clk : 50;
113	u8 act_cyc, rec_cyc;
114
115	if (clk <= 33) {
116		act_cyc =  9 - IDE_IN(active_time   * clk / 1000 + 1, 2,  9);
117		rec_cyc = 15 - IDE_IN(recovery_time * clk / 1000 + 1, 0, 15);
118	} else {
119		act_cyc =  8 - IDE_IN(active_time   * clk / 1000 + 1, 1,  8);
120		rec_cyc = 18 - IDE_IN(recovery_time * clk / 1000 + 1, 3, 18);
121	}
122
123	return (rec_cyc << 4) | 0x08 | act_cyc;
124}
125
126/*
127 * qd6580_compute_timing
128 *
129 * idem for qd6580
130 */
131
132static u8 qd6580_compute_timing (int active_time, int recovery_time)
133{
134	int clk = ide_vlb_clk ? ide_vlb_clk : 50;
135	u8 act_cyc, rec_cyc;
136
137	act_cyc = 17 - IDE_IN(active_time   * clk / 1000 + 1, 2, 17);
138	rec_cyc = 15 - IDE_IN(recovery_time * clk / 1000 + 1, 2, 15);
139
140	return (rec_cyc << 4) | act_cyc;
141}
142
143/*
144 * qd_find_disk_type
145 *
146 * tries to find timing from dos driver's table
147 */
148
149static int qd_find_disk_type (ide_drive_t *drive,
150		int *active_time, int *recovery_time)
151{
152	struct qd65xx_timing_s *p;
153	char *m = (char *)&drive->id[ATA_ID_PROD];
154	char model[ATA_ID_PROD_LEN];
155
156	if (*m == 0)
157		return 0;
158
159	strncpy(model, m, ATA_ID_PROD_LEN);
160	ide_fixstring(model, ATA_ID_PROD_LEN, 1); /* byte-swap */
161
162	for (p = qd65xx_timing ; p->offset != -1 ; p++) {
163		if (!strncmp(p->model, model+p->offset, 4)) {
164			printk(KERN_DEBUG "%s: listed !\n", drive->name);
165			*active_time = p->active;
166			*recovery_time = p->recovery;
167			return 1;
168		}
169	}
170	return 0;
171}
172
173/*
174 * qd_set_timing:
175 *
176 * records the timing
177 */
178
179static void qd_set_timing (ide_drive_t *drive, u8 timing)
180{
181	drive->drive_data &= 0xff00;
182	drive->drive_data |= timing;
183
184	printk(KERN_DEBUG "%s: %#x\n", drive->name, timing);
185}
186
187static void qd6500_set_pio_mode(ide_drive_t *drive, const u8 pio)
188{
189	u16 *id = drive->id;
190	int active_time   = 175;
191	int recovery_time = 415; /* worst case values from the dos driver */
192
193	/*
194	 * FIXME: use "pio" value
195	 */
196	if (!qd_find_disk_type(drive, &active_time, &recovery_time) &&
197	    (id[ATA_ID_OLD_PIO_MODES] & 0xff) && (id[ATA_ID_FIELD_VALID] & 2) &&
198	    id[ATA_ID_EIDE_PIO] >= 240) {
199		printk(KERN_INFO "%s: PIO mode%d\n", drive->name,
200			id[ATA_ID_OLD_PIO_MODES] & 0xff);
201		active_time = 110;
202		recovery_time = drive->id[ATA_ID_EIDE_PIO] - 120;
203	}
204
205	qd_set_timing(drive, qd6500_compute_timing(drive->hwif,
206				active_time, recovery_time));
207}
208
209static void qd6580_set_pio_mode(ide_drive_t *drive, const u8 pio)
210{
211	ide_hwif_t *hwif = drive->hwif;
212	struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
213	unsigned int cycle_time;
214	int active_time   = 175;
215	int recovery_time = 415; /* worst case values from the dos driver */
216	u8 base = (hwif->config_data & 0xff00) >> 8;
217
218	if (drive->id && !qd_find_disk_type(drive, &active_time, &recovery_time)) {
219		cycle_time = ide_pio_cycle_time(drive, pio);
220
221		switch (pio) {
222			case 0: break;
223			case 3:
224				if (cycle_time >= 110) {
225					active_time = 86;
226					recovery_time = cycle_time - 102;
227				} else
228					printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
229				break;
230			case 4:
231				if (cycle_time >= 69) {
232					active_time = 70;
233					recovery_time = cycle_time - 61;
234				} else
235					printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
236				break;
237			default:
238				if (cycle_time >= 180) {
239					active_time = 110;
240					recovery_time = cycle_time - 120;
241				} else {
242					active_time = t->active;
243					recovery_time = cycle_time - active_time;
244				}
245		}
246		printk(KERN_INFO "%s: PIO mode%d\n", drive->name,pio);
247	}
248
249	if (!hwif->channel && drive->media != ide_disk) {
250		outb(0x5f, QD_CONTROL_PORT);
251		printk(KERN_WARNING "%s: ATAPI: disabled read-ahead FIFO "
252			"and post-write buffer on %s.\n",
253			drive->name, hwif->name);
254	}
255
256	qd_set_timing(drive, qd6580_compute_timing(active_time, recovery_time));
257}
258
259/*
260 * qd_testreg
261 *
262 * tests if the given port is a register
263 */
264
265static int __init qd_testreg(int port)
266{
267	unsigned long flags;
268	u8 savereg, readreg;
269
270	local_irq_save(flags);
271	savereg = inb_p(port);
272	outb_p(QD_TESTVAL, port);	/* safe value */
273	readreg = inb_p(port);
274	outb(savereg, port);
275	local_irq_restore(flags);
276
277	if (savereg == QD_TESTVAL) {
278		printk(KERN_ERR "Outch ! the probe for qd65xx isn't reliable !\n");
279		printk(KERN_ERR "Please contact maintainers to tell about your hardware\n");
280		printk(KERN_ERR "Assuming qd65xx is not present.\n");
281		return 1;
282	}
283
284	return (readreg != QD_TESTVAL);
285}
286
287static void __init qd6500_init_dev(ide_drive_t *drive)
288{
289	ide_hwif_t *hwif = drive->hwif;
290	u8 base = (hwif->config_data & 0xff00) >> 8;
291	u8 config = QD_CONFIG(hwif);
292
293	drive->drive_data = QD6500_DEF_DATA;
294}
295
296static void __init qd6580_init_dev(ide_drive_t *drive)
297{
298	ide_hwif_t *hwif = drive->hwif;
299	u16 t1, t2;
300	u8 base = (hwif->config_data & 0xff00) >> 8;
301	u8 config = QD_CONFIG(hwif);
302
303	if (hwif->host_flags & IDE_HFLAG_SINGLE) {
304		t1 = QD6580_DEF_DATA;
305		t2 = QD6580_DEF_DATA2;
306	} else
307		t2 = t1 = hwif->channel ? QD6580_DEF_DATA2 : QD6580_DEF_DATA;
308
309	drive->drive_data = (drive->dn & 1) ? t2 : t1;
310}
311
312static const struct ide_port_ops qd6500_port_ops = {
313	.init_dev		= qd6500_init_dev,
314	.set_pio_mode		= qd6500_set_pio_mode,
315	.selectproc		= qd65xx_select,
316};
317
318static const struct ide_port_ops qd6580_port_ops = {
319	.init_dev		= qd6580_init_dev,
320	.set_pio_mode		= qd6580_set_pio_mode,
321	.selectproc		= qd65xx_select,
322};
323
324static const struct ide_port_info qd65xx_port_info __initdata = {
325	.name			= DRV_NAME,
326	.chipset		= ide_qd65xx,
327	.host_flags		= IDE_HFLAG_IO_32BIT |
328				  IDE_HFLAG_NO_DMA,
329	.pio_mask		= ATA_PIO4,
330};
331
332/*
333 * qd_probe:
334 *
335 * looks at the specified baseport, and if qd found, registers & initialises it
336 * return 1 if another qd may be probed
337 */
338
339static int __init qd_probe(int base)
340{
341	int rc;
342	u8 config, unit, control;
343	struct ide_port_info d = qd65xx_port_info;
344
345	config = inb(QD_CONFIG_PORT);
346
347	if (! ((config & QD_CONFIG_BASEPORT) >> 1 == (base == 0xb0)) )
348		return -ENODEV;
349
350	unit = ! (config & QD_CONFIG_IDE_BASEPORT);
351
352	if (unit)
353		d.host_flags |= IDE_HFLAG_QD_2ND_PORT;
354
355	switch (config & 0xf0) {
356	case QD_CONFIG_QD6500:
357		if (qd_testreg(base))
358			 return -ENODEV;	/* bad register */
359
360		if (config & QD_CONFIG_DISABLED) {
361			printk(KERN_WARNING "qd6500 is disabled !\n");
362			return -ENODEV;
363		}
364
365		printk(KERN_NOTICE "qd6500 at %#x\n", base);
366		printk(KERN_DEBUG "qd6500: config=%#x, ID3=%u\n",
367			config, QD_ID3);
368
369		d.port_ops = &qd6500_port_ops;
370		d.host_flags |= IDE_HFLAG_SINGLE;
371		break;
372	case QD_CONFIG_QD6580_A:
373	case QD_CONFIG_QD6580_B:
374		if (qd_testreg(base) || qd_testreg(base + 0x02))
375			return -ENODEV;	/* bad registers */
376
377		control = inb(QD_CONTROL_PORT);
378
379		printk(KERN_NOTICE "qd6580 at %#x\n", base);
380		printk(KERN_DEBUG "qd6580: config=%#x, control=%#x, ID3=%u\n",
381			config, control, QD_ID3);
382
383		outb(QD_DEF_CONTR, QD_CONTROL_PORT);
384
385		d.port_ops = &qd6580_port_ops;
386		if (control & QD_CONTR_SEC_DISABLED)
387			d.host_flags |= IDE_HFLAG_SINGLE;
388
389		printk(KERN_INFO "qd6580: %s IDE board\n",
390			(control & QD_CONTR_SEC_DISABLED) ? "single" : "dual");
391		break;
392	default:
393		return -ENODEV;
394	}
395
396	rc = ide_legacy_device_add(&d, (base << 8) | config);
397
398	if (d.host_flags & IDE_HFLAG_SINGLE)
399		return (rc == 0) ? 1 : rc;
400
401	return rc;
402}
403
404static int probe_qd65xx;
405
406module_param_named(probe, probe_qd65xx, bool, 0);
407MODULE_PARM_DESC(probe, "probe for QD65xx chipsets");
408
409static int __init qd65xx_init(void)
410{
411	int rc1, rc2 = -ENODEV;
412
413	if (probe_qd65xx == 0)
414		return -ENODEV;
415
416	rc1 = qd_probe(0x30);
417	if (rc1)
418		rc2 = qd_probe(0xb0);
419
420	if (rc1 < 0 && rc2 < 0)
421		return -ENODEV;
422
423	return 0;
424}
425
426module_init(qd65xx_init);
427
428MODULE_AUTHOR("Samuel Thibault");
429MODULE_DESCRIPTION("support of qd65xx vlb ide chipset");
430MODULE_LICENSE("GPL");
431