drivers/ide/legacy/qd65xx.c - maze/linux - Git at Google

 /*
  *  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 "ide0=autotune"
  * To enable second channel tuning (qd6580 only), use "ide1=autotune"
  */

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

 #undef REALLY_SLOW_IO		/* most systems can safely undef this */

 #include <linux/module.h>
 #include <linux/config.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);

 		create_proc_ide_interfaces();

 		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);

 			create_proc_ide_interfaces();

 			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);

 			create_proc_ide_interfaces();

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

 /* Can be called directly from ide.c. */
 int __init qd65xx_init(void)
 {
 	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");
	/*
	* 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 "ide0=autotune"
	* To enable second channel tuning (qd6580 only), use "ide1=autotune"
	*/

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

	#undef REALLY_SLOW_IO /* most systems can safely undef this */

	#include <linux/module.h>
	#include <linux/config.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);

	create_proc_ide_interfaces();

	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);

	create_proc_ide_interfaces();

	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);

	create_proc_ide_interfaces();

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

	/* Can be called directly from ide.c. */
	int __init qd65xx_init(void)
	{
	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");