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/drivers/ide/qd65xx.c

http://github.com/mirrors/linux
C | 446 lines | 264 code | 80 blank | 102 comment | 42 complexity | 57240666bd70a0cb5347eeb8ab9c423a MD5 | raw file
  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 *  Copyright (C) 1996-2001  Linus Torvalds & author (see below)
  4 */
  5
  6/*
  7 *  Version 0.03	Cleaned auto-tune, added probe
  8 *  Version 0.04	Added second channel tuning
  9 *  Version 0.05	Enhanced tuning ; added qd6500 support
 10 *  Version 0.06	Added dos driver's list
 11 *  Version 0.07	Second channel bug fix 
 12 *
 13 * QDI QD6500/QD6580 EIDE controller fast support
 14 *
 15 * To activate controller support, use "ide0=qd65xx"
 16 */
 17
 18/*
 19 * Rewritten from the work of Colten Edwards <pje120@cs.usask.ca> by
 20 * Samuel Thibault <samuel.thibault@ens-lyon.org>
 21 */
 22
 23#include <linux/module.h>
 24#include <linux/types.h>
 25#include <linux/kernel.h>
 26#include <linux/delay.h>
 27#include <linux/timer.h>
 28#include <linux/mm.h>
 29#include <linux/ioport.h>
 30#include <linux/blkdev.h>
 31#include <linux/ide.h>
 32#include <linux/init.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_dev_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	outb(drive->select | ATA_DEVICE_OBS, drive->hwif->io_ports.device_addr);
102}
103
104/*
105 * qd6500_compute_timing
106 *
107 * computes the timing value where
108 *	lower nibble represents active time,   in count of VLB clocks
109 *	upper nibble represents recovery time, in count of VLB clocks
110 */
111
112static u8 qd6500_compute_timing (ide_hwif_t *hwif, int active_time, int recovery_time)
113{
114	int clk = ide_vlb_clk ? ide_vlb_clk : 50;
115	u8 act_cyc, rec_cyc;
116
117	if (clk <= 33) {
118		act_cyc =  9 - IDE_IN(active_time   * clk / 1000 + 1, 2,  9);
119		rec_cyc = 15 - IDE_IN(recovery_time * clk / 1000 + 1, 0, 15);
120	} else {
121		act_cyc =  8 - IDE_IN(active_time   * clk / 1000 + 1, 1,  8);
122		rec_cyc = 18 - IDE_IN(recovery_time * clk / 1000 + 1, 3, 18);
123	}
124
125	return (rec_cyc << 4) | 0x08 | act_cyc;
126}
127
128/*
129 * qd6580_compute_timing
130 *
131 * idem for qd6580
132 */
133
134static u8 qd6580_compute_timing (int active_time, int recovery_time)
135{
136	int clk = ide_vlb_clk ? ide_vlb_clk : 50;
137	u8 act_cyc, rec_cyc;
138
139	act_cyc = 17 - IDE_IN(active_time   * clk / 1000 + 1, 2, 17);
140	rec_cyc = 15 - IDE_IN(recovery_time * clk / 1000 + 1, 2, 15);
141
142	return (rec_cyc << 4) | act_cyc;
143}
144
145/*
146 * qd_find_disk_type
147 *
148 * tries to find timing from dos driver's table
149 */
150
151static int qd_find_disk_type (ide_drive_t *drive,
152		int *active_time, int *recovery_time)
153{
154	struct qd65xx_timing_s *p;
155	char *m = (char *)&drive->id[ATA_ID_PROD];
156	char model[ATA_ID_PROD_LEN];
157
158	if (*m == 0)
159		return 0;
160
161	strncpy(model, m, ATA_ID_PROD_LEN);
162	ide_fixstring(model, ATA_ID_PROD_LEN, 1); /* byte-swap */
163
164	for (p = qd65xx_timing ; p->offset != -1 ; p++) {
165		if (!strncmp(p->model, model+p->offset, 4)) {
166			printk(KERN_DEBUG "%s: listed !\n", drive->name);
167			*active_time = p->active;
168			*recovery_time = p->recovery;
169			return 1;
170		}
171	}
172	return 0;
173}
174
175/*
176 * qd_set_timing:
177 *
178 * records the timing
179 */
180
181static void qd_set_timing (ide_drive_t *drive, u8 timing)
182{
183	unsigned long data = (unsigned long)ide_get_drivedata(drive);
184
185	data &= 0xff00;
186	data |= timing;
187	ide_set_drivedata(drive, (void *)data);
188
189	printk(KERN_DEBUG "%s: %#x\n", drive->name, timing);
190}
191
192static void qd6500_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
193{
194	u16 *id = drive->id;
195	int active_time   = 175;
196	int recovery_time = 415; /* worst case values from the dos driver */
197
198	/* FIXME: use drive->pio_mode value */
199	if (!qd_find_disk_type(drive, &active_time, &recovery_time) &&
200	    (id[ATA_ID_OLD_PIO_MODES] & 0xff) && (id[ATA_ID_FIELD_VALID] & 2) &&
201	    id[ATA_ID_EIDE_PIO] >= 240) {
202		printk(KERN_INFO "%s: PIO mode%d\n", drive->name,
203			id[ATA_ID_OLD_PIO_MODES] & 0xff);
204		active_time = 110;
205		recovery_time = drive->id[ATA_ID_EIDE_PIO] - 120;
206	}
207
208	qd_set_timing(drive, qd6500_compute_timing(drive->hwif,
209				active_time, recovery_time));
210}
211
212static void qd6580_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
213{
214	const u8 pio = drive->pio_mode - XFER_PIO_0;
215	struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
216	unsigned int cycle_time;
217	int active_time   = 175;
218	int recovery_time = 415; /* worst case values from the dos driver */
219	u8 base = (hwif->config_data & 0xff00) >> 8;
220
221	if (drive->id && !qd_find_disk_type(drive, &active_time, &recovery_time)) {
222		cycle_time = ide_pio_cycle_time(drive, pio);
223
224		switch (pio) {
225			case 0: break;
226			case 3:
227				if (cycle_time >= 110) {
228					active_time = 86;
229					recovery_time = cycle_time - 102;
230				} else
231					printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
232				break;
233			case 4:
234				if (cycle_time >= 69) {
235					active_time = 70;
236					recovery_time = cycle_time - 61;
237				} else
238					printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
239				break;
240			default:
241				if (cycle_time >= 180) {
242					active_time = 110;
243					recovery_time = cycle_time - 120;
244				} else {
245					active_time = t->active;
246					recovery_time = cycle_time - active_time;
247				}
248		}
249		printk(KERN_INFO "%s: PIO mode%d\n", drive->name,pio);
250	}
251
252	if (!hwif->channel && drive->media != ide_disk) {
253		outb(0x5f, QD_CONTROL_PORT);
254		printk(KERN_WARNING "%s: ATAPI: disabled read-ahead FIFO "
255			"and post-write buffer on %s.\n",
256			drive->name, hwif->name);
257	}
258
259	qd_set_timing(drive, qd6580_compute_timing(active_time, recovery_time));
260}
261
262/*
263 * qd_testreg
264 *
265 * tests if the given port is a register
266 */
267
268static int __init qd_testreg(int port)
269{
270	unsigned long flags;
271	u8 savereg, readreg;
272
273	local_irq_save(flags);
274	savereg = inb_p(port);
275	outb_p(QD_TESTVAL, port);	/* safe value */
276	readreg = inb_p(port);
277	outb(savereg, port);
278	local_irq_restore(flags);
279
280	if (savereg == QD_TESTVAL) {
281		printk(KERN_ERR "Outch ! the probe for qd65xx isn't reliable !\n");
282		printk(KERN_ERR "Please contact maintainers to tell about your hardware\n");
283		printk(KERN_ERR "Assuming qd65xx is not present.\n");
284		return 1;
285	}
286
287	return (readreg != QD_TESTVAL);
288}
289
290static void __init qd6500_init_dev(ide_drive_t *drive)
291{
292	ide_hwif_t *hwif = drive->hwif;
293	u8 base = (hwif->config_data & 0xff00) >> 8;
294	u8 config = QD_CONFIG(hwif);
295
296	ide_set_drivedata(drive, (void *)QD6500_DEF_DATA);
297}
298
299static void __init qd6580_init_dev(ide_drive_t *drive)
300{
301	ide_hwif_t *hwif = drive->hwif;
302	unsigned long t1, t2;
303	u8 base = (hwif->config_data & 0xff00) >> 8;
304	u8 config = QD_CONFIG(hwif);
305
306	if (hwif->host_flags & IDE_HFLAG_SINGLE) {
307		t1 = QD6580_DEF_DATA;
308		t2 = QD6580_DEF_DATA2;
309	} else
310		t2 = t1 = hwif->channel ? QD6580_DEF_DATA2 : QD6580_DEF_DATA;
311
312	ide_set_drivedata(drive, (void *)((drive->dn & 1) ? t2 : t1));
313}
314
315static const struct ide_tp_ops qd65xx_tp_ops = {
316	.exec_command		= ide_exec_command,
317	.read_status		= ide_read_status,
318	.read_altstatus		= ide_read_altstatus,
319	.write_devctl		= ide_write_devctl,
320
321	.dev_select		= qd65xx_dev_select,
322	.tf_load		= ide_tf_load,
323	.tf_read		= ide_tf_read,
324
325	.input_data		= ide_input_data,
326	.output_data		= ide_output_data,
327};
328
329static const struct ide_port_ops qd6500_port_ops = {
330	.init_dev		= qd6500_init_dev,
331	.set_pio_mode		= qd6500_set_pio_mode,
332};
333
334static const struct ide_port_ops qd6580_port_ops = {
335	.init_dev		= qd6580_init_dev,
336	.set_pio_mode		= qd6580_set_pio_mode,
337};
338
339static const struct ide_port_info qd65xx_port_info __initconst = {
340	.name			= DRV_NAME,
341	.tp_ops 		= &qd65xx_tp_ops,
342	.chipset		= ide_qd65xx,
343	.host_flags		= IDE_HFLAG_IO_32BIT |
344				  IDE_HFLAG_NO_DMA,
345	.pio_mask		= ATA_PIO4,
346};
347
348/*
349 * qd_probe:
350 *
351 * looks at the specified baseport, and if qd found, registers & initialises it
352 * return 1 if another qd may be probed
353 */
354
355static int __init qd_probe(int base)
356{
357	int rc;
358	u8 config, unit, control;
359	struct ide_port_info d = qd65xx_port_info;
360
361	config = inb(QD_CONFIG_PORT);
362
363	if (! ((config & QD_CONFIG_BASEPORT) >> 1 == (base == 0xb0)) )
364		return -ENODEV;
365
366	unit = ! (config & QD_CONFIG_IDE_BASEPORT);
367
368	if (unit)
369		d.host_flags |= IDE_HFLAG_QD_2ND_PORT;
370
371	switch (config & 0xf0) {
372	case QD_CONFIG_QD6500:
373		if (qd_testreg(base))
374			 return -ENODEV;	/* bad register */
375
376		if (config & QD_CONFIG_DISABLED) {
377			printk(KERN_WARNING "qd6500 is disabled !\n");
378			return -ENODEV;
379		}
380
381		printk(KERN_NOTICE "qd6500 at %#x\n", base);
382		printk(KERN_DEBUG "qd6500: config=%#x, ID3=%u\n",
383			config, QD_ID3);
384
385		d.port_ops = &qd6500_port_ops;
386		d.host_flags |= IDE_HFLAG_SINGLE;
387		break;
388	case QD_CONFIG_QD6580_A:
389	case QD_CONFIG_QD6580_B:
390		if (qd_testreg(base) || qd_testreg(base + 0x02))
391			return -ENODEV;	/* bad registers */
392
393		control = inb(QD_CONTROL_PORT);
394
395		printk(KERN_NOTICE "qd6580 at %#x\n", base);
396		printk(KERN_DEBUG "qd6580: config=%#x, control=%#x, ID3=%u\n",
397			config, control, QD_ID3);
398
399		outb(QD_DEF_CONTR, QD_CONTROL_PORT);
400
401		d.port_ops = &qd6580_port_ops;
402		if (control & QD_CONTR_SEC_DISABLED)
403			d.host_flags |= IDE_HFLAG_SINGLE;
404
405		printk(KERN_INFO "qd6580: %s IDE board\n",
406			(control & QD_CONTR_SEC_DISABLED) ? "single" : "dual");
407		break;
408	default:
409		return -ENODEV;
410	}
411
412	rc = ide_legacy_device_add(&d, (base << 8) | config);
413
414	if (d.host_flags & IDE_HFLAG_SINGLE)
415		return (rc == 0) ? 1 : rc;
416
417	return rc;
418}
419
420static bool probe_qd65xx;
421
422module_param_named(probe, probe_qd65xx, bool, 0);
423MODULE_PARM_DESC(probe, "probe for QD65xx chipsets");
424
425static int __init qd65xx_init(void)
426{
427	int rc1, rc2 = -ENODEV;
428
429	if (probe_qd65xx == 0)
430		return -ENODEV;
431
432	rc1 = qd_probe(0x30);
433	if (rc1)
434		rc2 = qd_probe(0xb0);
435
436	if (rc1 < 0 && rc2 < 0)
437		return -ENODEV;
438
439	return 0;
440}
441
442module_init(qd65xx_init);
443
444MODULE_AUTHOR("Samuel Thibault");
445MODULE_DESCRIPTION("support of qd65xx vlb ide chipset");
446MODULE_LICENSE("GPL");