qd65xx.c 12.8 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
/*
 *  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"
19 20
 * To enable tuning, use "hda=autotune hdb=autotune"
 * To enable 2nd channel tuning (qd6580 only), use "hdc=autotune hdd=autotune"
Linus Torvalds's avatar
Linus Torvalds committed
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
 */

/*
 * 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)
{
	int base = HWIF(drive)->select_data;
256
	unsigned int cycle_time;
Linus Torvalds's avatar
Linus Torvalds committed
257 258 259 260
	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)) {
261 262
		pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
		cycle_time = ide_pio_cycle_time(drive, pio);
Linus Torvalds's avatar
Linus Torvalds committed
263 264 265 266

		switch (pio) {
			case 0: break;
			case 3:
267
				if (cycle_time >= 110) {
Linus Torvalds's avatar
Linus Torvalds committed
268
					active_time = 86;
269
					recovery_time = cycle_time - 102;
Linus Torvalds's avatar
Linus Torvalds committed
270 271 272 273
				} else
					printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
				break;
			case 4:
274
				if (cycle_time >= 69) {
Linus Torvalds's avatar
Linus Torvalds committed
275
					active_time = 70;
276
					recovery_time = cycle_time - 61;
Linus Torvalds's avatar
Linus Torvalds committed
277 278 279 280
				} else
					printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
				break;
			default:
281
				if (cycle_time >= 180) {
Linus Torvalds's avatar
Linus Torvalds committed
282
					active_time = 110;
283
					recovery_time = cycle_time - 120;
Linus Torvalds's avatar
Linus Torvalds committed
284 285
				} else {
					active_time = ide_pio_timings[pio].active_time;
286
					recovery_time = cycle_time - active_time;
Linus Torvalds's avatar
Linus Torvalds committed
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
				}
		}
		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);

429
		ide_proc_register_port(hwif);
Linus Torvalds's avatar
Linus Torvalds committed
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

		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);

461
			ide_proc_register_port(hwif);
Linus Torvalds's avatar
Linus Torvalds committed
462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480

			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);

481 482
			ide_proc_register_port(hwif);
			ide_proc_register_port(mate);
Linus Torvalds's avatar
Linus Torvalds committed
483 484 485 486 487 488 489 490

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

491 492 493 494 495
int probe_qd65xx = 0;

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

Linus Torvalds's avatar
Linus Torvalds committed
496 497 498
/* Can be called directly from ide.c. */
int __init qd65xx_init(void)
{
499 500 501
	if (probe_qd65xx == 0)
		return -ENODEV;

Linus Torvalds's avatar
Linus Torvalds committed
502 503 504 505 506 507 508 509 510 511 512 513 514 515 516
	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");