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/*
* linux/drivers/ide/opti621.c Version 0.6 Jan 02, 1999
*
* 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/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 <asm/io.h>
#include "ide_modes.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 */
/* Uncommnent 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 */
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, byte 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;
}
}
}
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(byte 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.
*/
{
inw(reg_base+1);
inw(reg_base+1);
outb(3, reg_base+2);
outb(value, reg_base+reg);
outb(0x83, reg_base+2);
}
static byte read_reg(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.
*/
{
byte ret;
inw(reg_base+1);
inw(reg_base+1);
outb(3, reg_base+2);
ret=inb(reg_base+reg);
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, byte pio)
{
/* primary and secondary drives share some registers,
* so we have to program both drives
*/
unsigned long flags;
byte pio1, pio2;
pio_clocks_t first, second;
int ax, drdy;
byte 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
save_flags(flags); /* all CPUs */
cli(); /* all CPUs */
reg_base = hwif->io_ports[IDE_DATA_OFFSET];
outb(0xc0, reg_base+CNTRL_REG); /* allow Register-B */
outb(0xff, reg_base+5); /* hmm, setupvic.exe does this ;-) */
inb(reg_base+CNTRL_REG); /* if reads 0xff, adapter not exist? */
read_reg(CNTRL_REG); /* if reads 0xc0, no interface exist? */
read_reg(STRAP_REG); /* read version, probably 0 */
/* program primary drive */
write_reg(0, MISC_REG); /* select Index-0 for Register-A */
write_reg(cycle1, READ_REG); /* set read cycle timings */
write_reg(cycle1, WRITE_REG); /* set write cycle timings */
/* program secondary drive */
write_reg(1, MISC_REG); /* select Index-1 for Register-B */
write_reg(cycle2, READ_REG); /* set read cycle timings */
write_reg(cycle2, WRITE_REG); /* set write cycle timings */
write_reg(0x85, CNTRL_REG); /* use Register-A for drive 0 */
/* use Register-B for drive 1 */
write_reg(misc, MISC_REG); /* set address setup, DRDY timings, */
/* and read prefetch for both drives */
restore_flags(flags); /* all CPUs */
}
/*
* ide_init_opti621() is called once for each hwif found at boot.
*/
void __init ide_init_opti621 (ide_hwif_t *hwif)
{
hwif->drives[0].drive_data = PIO_DONT_KNOW;
hwif->drives[1].drive_data = PIO_DONT_KNOW;
hwif->tuneproc = &opti621_tune_drive;
}
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