drivers/ide/pci/opti621.c - kernel/msm-4.19 - Gitiles

 /*
  *  linux/drivers/ide/pci/opti621.c		Version 0.7	Sept 10, 2002
  *
  *  Copyright (C) 1996-1998  Linus Torvalds & authors (see below)
  */

 /*
  * Authors:
  * Jaromir Koutek <miri@punknet.cz>,
  * Jan Harkes <jaharkes@cwi.nl>,
  * Mark Lord <mlord@pobox.com>
  * Some parts of code are from ali14xx.c and from rz1000.c.
  *
  * OPTi is trademark of OPTi, Octek is trademark of Octek.
  *
  * I used docs from OPTi databook, from ftp.opti.com, file 9123-0002.ps
  * and disassembled/traced setupvic.exe (DOS program).
  * It increases kernel code about 2 kB.
  * I don't have this card no more, but I hope I can get some in case
  * of needed development.
  * My card is Octek PIDE 1.01 (on card) or OPTiViC (program).
  * It has a place for a secondary connector in circuit, but nothing
  * is there. Also BIOS says no address for
  * secondary controller (see bellow in ide_init_opti621).
  * I've only tested this on my system, which only has one disk.
  * It's Western Digital WDAC2850, with PIO mode 3. The PCI bus
  * is at 20 MHz (I have DX2/80, I tried PCI at 40, but I got random
  * lockups). I tried the OCTEK double speed CD-ROM and
  * it does not work! But I can't boot DOS also, so it's probably
  * hardware fault. I have connected Conner 80MB, the Seagate 850MB (no
  * problems) and Seagate 1GB (as slave, WD as master). My experiences
  * with the third, 1GB drive: I got 3MB/s (hdparm), but sometimes
  * it slows to about 100kB/s! I don't know why and I have
  * not this drive now, so I can't try it again.
  * I write this driver because I lost the paper ("manual") with
  * settings of jumpers on the card and I have to boot Linux with
  * Loadlin except LILO, cause I have to run the setupvic.exe program
  * already or I get disk errors (my test: rpm -Vf
  * /usr/X11R6/bin/XF86_SVGA - or any big file).
  * Some numbers from hdparm -t /dev/hda:
  * Timing buffer-cache reads:   32 MB in  3.02 seconds =10.60 MB/sec
  * Timing buffered disk reads:  16 MB in  5.52 seconds = 2.90 MB/sec
  * I have 4 Megs/s before, but I don't know why (maybe changes
  * in hdparm test).
  * After release of 0.1, I got some successful reports, so it might work.
  *
  * The main problem with OPTi is that some timings for master
  * and slave must be the same. For example, if you have master
  * PIO 3 and slave PIO 0, driver have to set some timings of
  * master for PIO 0. Second problem is that opti621_tune_drive
  * got only one drive to set, but have to set both drives.
  * This is solved in compute_pios. If you don't set
  * the second drive, compute_pios use ide_get_best_pio_mode
  * for autoselect mode (you can change it to PIO 0, if you want).
  * If you then set the second drive to another PIO, the old value
  * (automatically selected) will be overrided by yours.
  * There is a 25/33MHz switch in configuration
  * register, but driver is written for use at any frequency which get
  * (use idebus=xx to select PCI bus speed).
  * Use ide0=autotune for automatical tune of the PIO modes.
  * If you get strange results, do not use this and set PIO manually
  * by hdparm.
  *
  * Version 0.1, Nov 8, 1996
  * by Jaromir Koutek, for 2.1.8.
  * Initial version of driver.
  *
  * Version 0.2
  * Number 0.2 skipped.
  *
  * Version 0.3, Nov 29, 1997
  * by Mark Lord (probably), for 2.1.68
  * Updates for use with new IDE block driver.
  *
  * Version 0.4, Dec 14, 1997
  * by Jan Harkes
  * Fixed some errors and cleaned the code.
  *
  * Version 0.5, Jan 2, 1998
  * by Jaromir Koutek
  * Updates for use with (again) new IDE block driver.
  * Update of documentation.
  *
  * Version 0.6, Jan 2, 1999
  * by Jaromir Koutek
  * Reversed to version 0.3 of the driver, because
  * 0.5 doesn't work.
  */

 #undef REALLY_SLOW_IO	/* most systems can safely undef this */
 #define OPTI621_DEBUG		/* define for debug messages */

 #include <linux/types.h>
 #include <linux/module.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/pci.h>
 #include <linux/hdreg.h>
 #include <linux/ide.h>

 #include <asm/io.h>

 #define OPTI621_MAX_PIO 3
 /* In fact, I do not have any PIO 4 drive
  * (address: 25 ns, data: 70 ns, recovery: 35 ns),
  * but OPTi 82C621 is programmable and it can do (minimal values):
  * on 40MHz PCI bus (pulse 25 ns):
  *  address: 25 ns, data: 25 ns, recovery: 50 ns;
  * on 20MHz PCI bus (pulse 50 ns):
  *  address: 50 ns, data: 50 ns, recovery: 100 ns.
  */

 /* #define READ_PREFETCH 0 */
 /* Uncomment for disable read prefetch.
  * There is some readprefetch capatibility in hdparm,
  * but when I type hdparm -P 1 /dev/hda, I got errors
  * and till reset drive is inaccessible.
  * This (hw) read prefetch is safe on my drive.
  */

 #ifndef READ_PREFETCH
 #define READ_PREFETCH 0x40 /* read prefetch is enabled */
 #endif /* else read prefetch is disabled */

 #define READ_REG 0	/* index of Read cycle timing register */
 #define WRITE_REG 1	/* index of Write cycle timing register */
 #define CNTRL_REG 3	/* index of Control register */
 #define STRAP_REG 5	/* index of Strap register */
 #define MISC_REG 6	/* index of Miscellaneous register */

 static int reg_base;

 #define PIO_NOT_EXIST 254
 #define PIO_DONT_KNOW 255

 /* there are stored pio numbers from other calls of opti621_tune_drive */
 static void compute_pios(ide_drive_t *drive, u8 pio)
 /* Store values into drive->drive_data
  *	second_contr - 0 for primary controller, 1 for secondary
  *	slave_drive - 0 -> pio is for master, 1 -> pio is for slave
  *	pio - PIO mode for selected drive (for other we don't know)
  */
 {
 	int d;
 	ide_hwif_t *hwif = HWIF(drive);

 	drive->drive_data = ide_get_best_pio_mode(drive, pio, OPTI621_MAX_PIO, NULL);
 	for (d = 0; d < 2; ++d) {
 		drive = &hwif->drives[d];
 		if (drive->present) {
 			if (drive->drive_data == PIO_DONT_KNOW)
 				drive->drive_data = ide_get_best_pio_mode(drive, 255, OPTI621_MAX_PIO, NULL);
 #ifdef OPTI621_DEBUG
 			printk("%s: Selected PIO mode %d\n",
 				drive->name, drive->drive_data);
 #endif
 		} else {
 			drive->drive_data = PIO_NOT_EXIST;
 		}
 	}
 }

 static int cmpt_clk(int time, int bus_speed)
 /* Returns (rounded up) time in clocks for time in ns,
  * with bus_speed in MHz.
  * Example: bus_speed = 40 MHz, time = 80 ns
  * 1000/40 = 25 ns (clk value),
  * 80/25 = 3.2, rounded up to 4 (I hope ;-)).
  * Use idebus=xx to select right frequency.
  */
 {
 	return ((time*bus_speed+999)/1000);
 }

 static void write_reg(ide_hwif_t *hwif, u8 value, int reg)
 /* Write value to register reg, base of register
  * is at reg_base (0x1f0 primary, 0x170 secondary,
  * if not changed by PCI configuration).
  * This is from setupvic.exe program.
  */
 {
 	hwif->INW(reg_base+1);
 	hwif->INW(reg_base+1);
 	hwif->OUTB(3, reg_base+2);
 	hwif->OUTB(value, reg_base+reg);
 	hwif->OUTB(0x83, reg_base+2);
 }

 static u8 read_reg(ide_hwif_t *hwif, int reg)
 /* Read value from register reg, base of register
  * is at reg_base (0x1f0 primary, 0x170 secondary,
  * if not changed by PCI configuration).
  * This is from setupvic.exe program.
  */
 {
 	u8 ret = 0;

 	hwif->INW(reg_base+1);
 	hwif->INW(reg_base+1);
 	hwif->OUTB(3, reg_base+2);
 	ret = hwif->INB(reg_base+reg);
 	hwif->OUTB(0x83, reg_base+2);
 	return ret;
 }

 typedef struct pio_clocks_s {
 	int	address_time;	/* Address setup (clocks) */
 	int	data_time;	/* Active/data pulse (clocks) */
 	int	recovery_time;	/* Recovery time (clocks) */
 } pio_clocks_t;

 static void compute_clocks(int pio, pio_clocks_t *clks)
 {
         if (pio != PIO_NOT_EXIST) {
         	int adr_setup, data_pls;
 		int bus_speed = system_bus_clock();

  	       	adr_setup = ide_pio_timings[pio].setup_time;
   	      	data_pls = ide_pio_timings[pio].active_time;
 	  	clks->address_time = cmpt_clk(adr_setup, bus_speed);
 	     	clks->data_time = cmpt_clk(data_pls, bus_speed);
      		clks->recovery_time = cmpt_clk(ide_pio_timings[pio].cycle_time
      			- adr_setup-data_pls, bus_speed);
      		if (clks->address_time<1) clks->address_time = 1;
      		if (clks->address_time>4) clks->address_time = 4;
      		if (clks->data_time<1) clks->data_time = 1;
      		if (clks->data_time>16) clks->data_time = 16;
      		if (clks->recovery_time<2) clks->recovery_time = 2;
      		if (clks->recovery_time>17) clks->recovery_time = 17;
 	} else {
 		clks->address_time = 1;
 		clks->data_time = 1;
 		clks->recovery_time = 2;
 		/* minimal values */
 	}

 }

 /* Main tune procedure, called from tuneproc. */
 static void opti621_tune_drive (ide_drive_t *drive, u8 pio)
 {
 	/* primary and secondary drives share some registers,
 	 * so we have to program both drives
 	 */
 	unsigned long flags;
 	u8 pio1 = 0, pio2 = 0;
 	pio_clocks_t first, second;
 	int ax, drdy;
 	u8 cycle1, cycle2, misc;
 	ide_hwif_t *hwif = HWIF(drive);

 	/* sets drive->drive_data for both drives */
 	compute_pios(drive, pio);
  	pio1 = hwif->drives[0].drive_data;
  	pio2 = hwif->drives[1].drive_data;

 	compute_clocks(pio1, &first);
 	compute_clocks(pio2, &second);

 	/* ax = max(a1,a2) */
 	ax = (first.address_time < second.address_time) ? second.address_time : first.address_time;

 	drdy = 2; /* DRDY is default 2 (by OPTi Databook) */

 	cycle1 = ((first.data_time-1)<<4)  | (first.recovery_time-2);
 	cycle2 = ((second.data_time-1)<<4) | (second.recovery_time-2);
 	misc = READ_PREFETCH | ((ax-1)<<4) | ((drdy-2)<<1);

 #ifdef OPTI621_DEBUG
 	printk("%s: master: address: %d, data: %d, "
 		"recovery: %d, drdy: %d [clk]\n",
 		hwif->name, ax, first.data_time,
 		first.recovery_time, drdy);
 	printk("%s: slave:  address: %d, data: %d, "
 		"recovery: %d, drdy: %d [clk]\n",
 		hwif->name, ax, second.data_time,
 		second.recovery_time, drdy);
 #endif

 	spin_lock_irqsave(&ide_lock, flags);

      	reg_base = hwif->io_ports[IDE_DATA_OFFSET];

 	/* allow Register-B */
 	hwif->OUTB(0xc0, reg_base+CNTRL_REG);
 	/* hmm, setupvic.exe does this ;-) */
 	hwif->OUTB(0xff, reg_base+5);
 	/* if reads 0xff, adapter not exist? */
 	(void) hwif->INB(reg_base+CNTRL_REG);
 	/* if reads 0xc0, no interface exist? */
 	read_reg(hwif, CNTRL_REG);
 	/* read version, probably 0 */
 	read_reg(hwif, STRAP_REG);

 	/* program primary drive */
 		/* select Index-0 for Register-A */
 	write_reg(hwif, 0,      MISC_REG);
 		/* set read cycle timings */
 	write_reg(hwif, cycle1, READ_REG);
 		/* set write cycle timings */
 	write_reg(hwif, cycle1, WRITE_REG);

 	/* program secondary drive */
 		/* select Index-1 for Register-B */
 	write_reg(hwif, 1,      MISC_REG);
 		/* set read cycle timings */
 	write_reg(hwif, cycle2, READ_REG);
 		/* set write cycle timings */
 	write_reg(hwif, cycle2, WRITE_REG);

 	/* use Register-A for drive 0 */
 	/* use Register-B for drive 1 */
 	write_reg(hwif, 0x85, CNTRL_REG);

 	/* set address setup, DRDY timings,   */
 	/*  and read prefetch for both drives */
  	write_reg(hwif, misc, MISC_REG);

 	spin_unlock_irqrestore(&ide_lock, flags);
 }

 /*
  * init_hwif_opti621() is called once for each hwif found at boot.
  */
 static void __devinit init_hwif_opti621 (ide_hwif_t *hwif)
 {
 	hwif->autodma = 0;
 	hwif->drives[0].drive_data = PIO_DONT_KNOW;
 	hwif->drives[1].drive_data = PIO_DONT_KNOW;
 	hwif->tuneproc = &opti621_tune_drive;

 	if (!(hwif->dma_base))
 		return;

 	hwif->atapi_dma = 1;
 	hwif->mwdma_mask = 0x07;
 	hwif->swdma_mask = 0x07;

 	if (!noautodma)
 		hwif->autodma = 1;
 	hwif->drives[0].autodma = hwif->autodma;
 	hwif->drives[1].autodma = hwif->autodma;
 }

 static ide_pci_device_t opti621_chipsets[] __devinitdata = {
 	{	/* 0 */
 		.name		= "OPTI621",
 		.init_hwif	= init_hwif_opti621,
 		.channels	= 2,
 		.autodma	= AUTODMA,
 		.enablebits	= {{0x45,0x80,0x00}, {0x40,0x08,0x00}},
 		.bootable	= ON_BOARD,
 	},{	/* 1 */
 		.name		= "OPTI621X",
 		.init_hwif	= init_hwif_opti621,
 		.channels	= 2,
 		.autodma	= AUTODMA,
 		.enablebits	= {{0x45,0x80,0x00}, {0x40,0x08,0x00}},
 		.bootable	= ON_BOARD,
 	}
 };

 static int __devinit opti621_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 {
 	return ide_setup_pci_device(dev, &opti621_chipsets[id->driver_data]);
 }

 static struct pci_device_id opti621_pci_tbl[] = {
 	{ PCI_VENDOR_ID_OPTI, PCI_DEVICE_ID_OPTI_82C621, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
 	{ PCI_VENDOR_ID_OPTI, PCI_DEVICE_ID_OPTI_82C825, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 1},
 	{ 0, },
 };
 MODULE_DEVICE_TABLE(pci, opti621_pci_tbl);

 static struct pci_driver driver = {
 	.name		= "Opti621_IDE",
 	.id_table	= opti621_pci_tbl,
 	.probe		= opti621_init_one,
 };

 static int __init opti621_ide_init(void)
 {
 	return ide_pci_register_driver(&driver);
 }

 module_init(opti621_ide_init);

 MODULE_AUTHOR("Jaromir Koutek, Jan Harkes, Mark Lord");
 MODULE_DESCRIPTION("PCI driver module for Opti621 IDE");
 MODULE_LICENSE("GPL");
	/*
	* linux/drivers/ide/pci/opti621.c Version 0.7 Sept 10, 2002
	*
	* Copyright (C) 1996-1998 Linus Torvalds & authors (see below)
	*/

	/*
	* Authors:
	* Jaromir Koutek <miri@punknet.cz>,
	* Jan Harkes <jaharkes@cwi.nl>,
	* Mark Lord <mlord@pobox.com>
	* Some parts of code are from ali14xx.c and from rz1000.c.
	*
	* OPTi is trademark of OPTi, Octek is trademark of Octek.
	*
	* I used docs from OPTi databook, from ftp.opti.com, file 9123-0002.ps
	* and disassembled/traced setupvic.exe (DOS program).
	* It increases kernel code about 2 kB.
	* I don't have this card no more, but I hope I can get some in case
	* of needed development.
	* My card is Octek PIDE 1.01 (on card) or OPTiViC (program).
	* It has a place for a secondary connector in circuit, but nothing
	* is there. Also BIOS says no address for
	* secondary controller (see bellow in ide_init_opti621).
	* I've only tested this on my system, which only has one disk.
	* It's Western Digital WDAC2850, with PIO mode 3. The PCI bus
	* is at 20 MHz (I have DX2/80, I tried PCI at 40, but I got random
	* lockups). I tried the OCTEK double speed CD-ROM and
	* it does not work! But I can't boot DOS also, so it's probably
	* hardware fault. I have connected Conner 80MB, the Seagate 850MB (no
	* problems) and Seagate 1GB (as slave, WD as master). My experiences
	* with the third, 1GB drive: I got 3MB/s (hdparm), but sometimes
	* it slows to about 100kB/s! I don't know why and I have
	* not this drive now, so I can't try it again.
	* I write this driver because I lost the paper ("manual") with
	* settings of jumpers on the card and I have to boot Linux with
	* Loadlin except LILO, cause I have to run the setupvic.exe program
	* already or I get disk errors (my test: rpm -Vf
	* /usr/X11R6/bin/XF86_SVGA - or any big file).
	* Some numbers from hdparm -t /dev/hda:
	* Timing buffer-cache reads: 32 MB in 3.02 seconds =10.60 MB/sec
	* Timing buffered disk reads: 16 MB in 5.52 seconds = 2.90 MB/sec
	* I have 4 Megs/s before, but I don't know why (maybe changes
	* in hdparm test).
	* After release of 0.1, I got some successful reports, so it might work.
	*
	* The main problem with OPTi is that some timings for master
	* and slave must be the same. For example, if you have master
	* PIO 3 and slave PIO 0, driver have to set some timings of
	* master for PIO 0. Second problem is that opti621_tune_drive
	* got only one drive to set, but have to set both drives.
	* This is solved in compute_pios. If you don't set
	* the second drive, compute_pios use ide_get_best_pio_mode
	* for autoselect mode (you can change it to PIO 0, if you want).
	* If you then set the second drive to another PIO, the old value
	* (automatically selected) will be overrided by yours.
	* There is a 25/33MHz switch in configuration
	* register, but driver is written for use at any frequency which get
	* (use idebus=xx to select PCI bus speed).
	* Use ide0=autotune for automatical tune of the PIO modes.
	* If you get strange results, do not use this and set PIO manually
	* by hdparm.
	*
	* Version 0.1, Nov 8, 1996
	* by Jaromir Koutek, for 2.1.8.
	* Initial version of driver.
	*
	* Version 0.2
	* Number 0.2 skipped.
	*
	* Version 0.3, Nov 29, 1997
	* by Mark Lord (probably), for 2.1.68
	* Updates for use with new IDE block driver.
	*
	* Version 0.4, Dec 14, 1997
	* by Jan Harkes
	* Fixed some errors and cleaned the code.
	*
	* Version 0.5, Jan 2, 1998
	* by Jaromir Koutek
	* Updates for use with (again) new IDE block driver.
	* Update of documentation.
	*
	* Version 0.6, Jan 2, 1999
	* by Jaromir Koutek
	* Reversed to version 0.3 of the driver, because
	* 0.5 doesn't work.
	*/

	#undef REALLY_SLOW_IO /* most systems can safely undef this */
	#define OPTI621_DEBUG /* define for debug messages */

	#include <linux/types.h>
	#include <linux/module.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/pci.h>
	#include <linux/hdreg.h>
	#include <linux/ide.h>

	#include <asm/io.h>

	#define OPTI621_MAX_PIO 3
	/* In fact, I do not have any PIO 4 drive
	* (address: 25 ns, data: 70 ns, recovery: 35 ns),
	* but OPTi 82C621 is programmable and it can do (minimal values):
	* on 40MHz PCI bus (pulse 25 ns):
	* address: 25 ns, data: 25 ns, recovery: 50 ns;
	* on 20MHz PCI bus (pulse 50 ns):
	* address: 50 ns, data: 50 ns, recovery: 100 ns.
	*/

	/* #define READ_PREFETCH 0 */
	/* Uncomment for disable read prefetch.
	* There is some readprefetch capatibility in hdparm,
	* but when I type hdparm -P 1 /dev/hda, I got errors
	* and till reset drive is inaccessible.
	* This (hw) read prefetch is safe on my drive.
	*/

	#ifndef READ_PREFETCH
	#define READ_PREFETCH 0x40 /* read prefetch is enabled */
	#endif /* else read prefetch is disabled */

	#define READ_REG 0 /* index of Read cycle timing register */
	#define WRITE_REG 1 /* index of Write cycle timing register */
	#define CNTRL_REG 3 /* index of Control register */
	#define STRAP_REG 5 /* index of Strap register */
	#define MISC_REG 6 /* index of Miscellaneous register */

	static int reg_base;

	#define PIO_NOT_EXIST 254
	#define PIO_DONT_KNOW 255

	/* there are stored pio numbers from other calls of opti621_tune_drive */
	static void compute_pios(ide_drive_t *drive, u8 pio)
	/* Store values into drive->drive_data
	* second_contr - 0 for primary controller, 1 for secondary
	* slave_drive - 0 -> pio is for master, 1 -> pio is for slave
	* pio - PIO mode for selected drive (for other we don't know)
	*/
	{
	int d;
	ide_hwif_t *hwif = HWIF(drive);

	drive->drive_data = ide_get_best_pio_mode(drive, pio, OPTI621_MAX_PIO, NULL);
	for (d = 0; d < 2; ++d) {
	drive = &hwif->drives[d];
	if (drive->present) {
	if (drive->drive_data == PIO_DONT_KNOW)
	drive->drive_data = ide_get_best_pio_mode(drive, 255, OPTI621_MAX_PIO, NULL);
	#ifdef OPTI621_DEBUG
	printk("%s: Selected PIO mode %d\n",
	drive->name, drive->drive_data);
	#endif
	} else {
	drive->drive_data = PIO_NOT_EXIST;
	}
	}
	}

	static int cmpt_clk(int time, int bus_speed)
	/* Returns (rounded up) time in clocks for time in ns,
	* with bus_speed in MHz.
	* Example: bus_speed = 40 MHz, time = 80 ns
	* 1000/40 = 25 ns (clk value),
	* 80/25 = 3.2, rounded up to 4 (I hope ;-)).
	* Use idebus=xx to select right frequency.
	*/
	{
	return ((time*bus_speed+999)/1000);
	}

	static void write_reg(ide_hwif_t *hwif, u8 value, int reg)
	/* Write value to register reg, base of register
	* is at reg_base (0x1f0 primary, 0x170 secondary,
	* if not changed by PCI configuration).
	* This is from setupvic.exe program.
	*/
	{
	hwif->INW(reg_base+1);
	hwif->INW(reg_base+1);
	hwif->OUTB(3, reg_base+2);
	hwif->OUTB(value, reg_base+reg);
	hwif->OUTB(0x83, reg_base+2);
	}

	static u8 read_reg(ide_hwif_t *hwif, int reg)
	/* Read value from register reg, base of register
	* is at reg_base (0x1f0 primary, 0x170 secondary,
	* if not changed by PCI configuration).
	* This is from setupvic.exe program.
	*/
	{
	u8 ret = 0;

	hwif->INW(reg_base+1);
	hwif->INW(reg_base+1);
	hwif->OUTB(3, reg_base+2);
	ret = hwif->INB(reg_base+reg);
	hwif->OUTB(0x83, reg_base+2);
	return ret;
	}

	typedef struct pio_clocks_s {
	int address_time; /* Address setup (clocks) */
	int data_time; /* Active/data pulse (clocks) */
	int recovery_time; /* Recovery time (clocks) */
	} pio_clocks_t;

	static void compute_clocks(int pio, pio_clocks_t *clks)
	{
	if (pio != PIO_NOT_EXIST) {
	int adr_setup, data_pls;
	int bus_speed = system_bus_clock();

	adr_setup = ide_pio_timings[pio].setup_time;
	data_pls = ide_pio_timings[pio].active_time;
	clks->address_time = cmpt_clk(adr_setup, bus_speed);
	clks->data_time = cmpt_clk(data_pls, bus_speed);
	clks->recovery_time = cmpt_clk(ide_pio_timings[pio].cycle_time
	- adr_setup-data_pls, bus_speed);
	if (clks->address_time<1) clks->address_time = 1;
	if (clks->address_time>4) clks->address_time = 4;
	if (clks->data_time<1) clks->data_time = 1;
	if (clks->data_time>16) clks->data_time = 16;
	if (clks->recovery_time<2) clks->recovery_time = 2;
	if (clks->recovery_time>17) clks->recovery_time = 17;
	} else {
	clks->address_time = 1;
	clks->data_time = 1;
	clks->recovery_time = 2;
	/* minimal values */
	}

	}

	/* Main tune procedure, called from tuneproc. */
	static void opti621_tune_drive (ide_drive_t *drive, u8 pio)
	{
	/* primary and secondary drives share some registers,
	* so we have to program both drives
	*/
	unsigned long flags;
	u8 pio1 = 0, pio2 = 0;
	pio_clocks_t first, second;
	int ax, drdy;
	u8 cycle1, cycle2, misc;
	ide_hwif_t *hwif = HWIF(drive);

	/* sets drive->drive_data for both drives */
	compute_pios(drive, pio);
	pio1 = hwif->drives[0].drive_data;
	pio2 = hwif->drives[1].drive_data;

	compute_clocks(pio1, &first);
	compute_clocks(pio2, &second);

	/* ax = max(a1,a2) */
	ax = (first.address_time < second.address_time) ? second.address_time : first.address_time;

	drdy = 2; /* DRDY is default 2 (by OPTi Databook) */

	cycle1 = ((first.data_time-1)<<4) \| (first.recovery_time-2);
	cycle2 = ((second.data_time-1)<<4) \| (second.recovery_time-2);
	misc = READ_PREFETCH \| ((ax-1)<<4) \| ((drdy-2)<<1);

	#ifdef OPTI621_DEBUG
	printk("%s: master: address: %d, data: %d, "
	"recovery: %d, drdy: %d [clk]\n",
	hwif->name, ax, first.data_time,
	first.recovery_time, drdy);
	printk("%s: slave: address: %d, data: %d, "
	"recovery: %d, drdy: %d [clk]\n",
	hwif->name, ax, second.data_time,
	second.recovery_time, drdy);
	#endif

	spin_lock_irqsave(&ide_lock, flags);

	reg_base = hwif->io_ports[IDE_DATA_OFFSET];

	/* allow Register-B */
	hwif->OUTB(0xc0, reg_base+CNTRL_REG);
	/* hmm, setupvic.exe does this ;-) */
	hwif->OUTB(0xff, reg_base+5);
	/* if reads 0xff, adapter not exist? */
	(void) hwif->INB(reg_base+CNTRL_REG);
	/* if reads 0xc0, no interface exist? */
	read_reg(hwif, CNTRL_REG);
	/* read version, probably 0 */
	read_reg(hwif, STRAP_REG);

	/* program primary drive */
	/* select Index-0 for Register-A */
	write_reg(hwif, 0, MISC_REG);
	/* set read cycle timings */
	write_reg(hwif, cycle1, READ_REG);
	/* set write cycle timings */
	write_reg(hwif, cycle1, WRITE_REG);

	/* program secondary drive */
	/* select Index-1 for Register-B */
	write_reg(hwif, 1, MISC_REG);
	/* set read cycle timings */
	write_reg(hwif, cycle2, READ_REG);
	/* set write cycle timings */
	write_reg(hwif, cycle2, WRITE_REG);

	/* use Register-A for drive 0 */
	/* use Register-B for drive 1 */
	write_reg(hwif, 0x85, CNTRL_REG);

	/* set address setup, DRDY timings, */
	/* and read prefetch for both drives */
	write_reg(hwif, misc, MISC_REG);

	spin_unlock_irqrestore(&ide_lock, flags);
	}

	/*
	* init_hwif_opti621() is called once for each hwif found at boot.
	*/
	static void __devinit init_hwif_opti621 (ide_hwif_t *hwif)
	{
	hwif->autodma = 0;
	hwif->drives[0].drive_data = PIO_DONT_KNOW;
	hwif->drives[1].drive_data = PIO_DONT_KNOW;
	hwif->tuneproc = &opti621_tune_drive;

	if (!(hwif->dma_base))
	return;

	hwif->atapi_dma = 1;
	hwif->mwdma_mask = 0x07;
	hwif->swdma_mask = 0x07;

	if (!noautodma)
	hwif->autodma = 1;
	hwif->drives[0].autodma = hwif->autodma;
	hwif->drives[1].autodma = hwif->autodma;
	}

	static ide_pci_device_t opti621_chipsets[] __devinitdata = {
	{ /* 0 */
	.name = "OPTI621",
	.init_hwif = init_hwif_opti621,
	.channels = 2,
	.autodma = AUTODMA,
	.enablebits = {{0x45,0x80,0x00}, {0x40,0x08,0x00}},
	.bootable = ON_BOARD,
	},{ /* 1 */
	.name = "OPTI621X",
	.init_hwif = init_hwif_opti621,
	.channels = 2,
	.autodma = AUTODMA,
	.enablebits = {{0x45,0x80,0x00}, {0x40,0x08,0x00}},
	.bootable = ON_BOARD,
	}
	};

	static int __devinit opti621_init_one(struct pci_dev dev, const struct pci_device_id id)
	{
	return ide_setup_pci_device(dev, &opti621_chipsets[id->driver_data]);
	}

	static struct pci_device_id opti621_pci_tbl[] = {
	{ PCI_VENDOR_ID_OPTI, PCI_DEVICE_ID_OPTI_82C621, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
	{ PCI_VENDOR_ID_OPTI, PCI_DEVICE_ID_OPTI_82C825, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 1},
	{ 0, },
	};
	MODULE_DEVICE_TABLE(pci, opti621_pci_tbl);

	static struct pci_driver driver = {
	.name = "Opti621_IDE",
	.id_table = opti621_pci_tbl,
	.probe = opti621_init_one,
	};

	static int __init opti621_ide_init(void)
	{
	return ide_pci_register_driver(&driver);
	}

	module_init(opti621_ide_init);

	MODULE_AUTHOR("Jaromir Koutek, Jan Harkes, Mark Lord");
	MODULE_DESCRIPTION("PCI driver module for Opti621 IDE");
	MODULE_LICENSE("GPL");