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/*
* linux/drivers/ide/ht6560b.c Version 0.07 Feb 1, 2000
*
* Copyright (C) 1995-2000 Linus Torvalds & author (see below)
*/
/*
*
* Version 0.01 Initial version hacked out of ide.c
*
* Version 0.02 Added support for PIO modes, auto-tune
*
* Version 0.03 Some cleanups
*
* Version 0.05 PIO mode cycle timings auto-tune using bus-speed
*
* Version 0.06 Prefetch mode now defaults no OFF. To set
* prefetch mode OFF/ON use "hdparm -p8/-p9".
* Unmask irq is disabled when prefetch mode
* is enabled.
*
* Version 0.07 Trying to fix CD-ROM detection problem.
* "Prefetch" mode bit OFF for ide disks and
* ON for anything else.
*
*
* HT-6560B EIDE-controller support
* To activate controller support use kernel parameter "ide0=ht6560b".
* Use hdparm utility to enable PIO mode support.
*
* Author: Mikko Ala-Fossi <maf@iki.fi>
* Jan Evert van Grootheest <janevert@iae.nl>
*
* Try: http://www.maf.iki.fi/~maf/ht6560b/
*/
#define HT6560B_VERSION "v0.07"
#undef REALLY_SLOW_IO /* most systems can safely undef this */
#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/io.h>
#include "ide_modes.h"
/* #define DEBUG */ /* remove comments for DEBUG messages */
/*
* The special i/o-port that HT-6560B uses to configuration:
* bit0 (0x01): "1" selects secondary interface
* bit2 (0x04): "1" enables FIFO function
* bit5 (0x20): "1" enables prefetched data read function (???)
*
* The special i/o-port that HT-6560A uses to configuration:
* bit0 (0x01): "1" selects secondary interface
* bit1 (0x02): "1" enables prefetched data read function
* bit2 (0x04): "0" enables multi-master system (?)
* bit3 (0x08): "1" 3 cycle time, "0" 2 cycle time (?)
*/
#define HT_CONFIG_PORT 0x3e6
#define HT_CONFIG(drivea) (byte)(((drivea)->drive_data & 0xff00) >> 8)
/*
* FIFO + PREFETCH (both a/b-model)
*/
#define HT_CONFIG_DEFAULT 0x1c /* no prefetch */
/* #define HT_CONFIG_DEFAULT 0x3c */ /* with prefetch */
#define HT_SECONDARY_IF 0x01
#define HT_PREFETCH_MODE 0x20
/*
* ht6560b Timing values:
*
* I reviewed some assembler source listings of htide drivers and found
* out how they setup those cycle time interfacing values, as they at Holtek
* call them. IDESETUP.COM that is supplied with the drivers figures out
* optimal values and fetches those values to drivers. I found out that
* they use IDE_SELECT_REG to fetch timings to the ide board right after
* interface switching. After that it was quite easy to add code to
* ht6560b.c.
*
* IDESETUP.COM gave me values 0x24, 0x45, 0xaa, 0xff that worked fine
* for hda and hdc. But hdb needed higher values to work, so I guess
* that sometimes it is necessary to give higher value than IDESETUP
* gives. [see cmd640.c for an extreme example of this. -ml]
*
* Perhaps I should explain something about these timing values:
* The higher nibble of value is the Recovery Time (rt) and the lower nibble
* of the value is the Active Time (at). Minimum value 2 is the fastest and
* the maximum value 15 is the slowest. Default values should be 15 for both.
* So 0x24 means 2 for rt and 4 for at. Each of the drives should have
* both values, and IDESETUP gives automatically rt=15 st=15 for CDROMs or
* similar. If value is too small there will be all sorts of failures.
*
* Timing byte consists of
* High nibble: Recovery Cycle Time (rt)
* The valid values range from 2 to 15. The default is 15.
*
* Low nibble: Active Cycle Time (at)
* The valid values range from 2 to 15. The default is 15.
*
* You can obtain optimized timing values by running Holtek IDESETUP.COM
* for DOS. DOS drivers get their timing values from command line, where
* the first value is the Recovery Time and the second value is the
* Active Time for each drive. Smaller value gives higher speed.
* In case of failures you should probably fall back to a higher value.
*/
#define HT_TIMING(drivea) (byte)((drivea)->drive_data & 0x00ff)
#define HT_TIMING_DEFAULT 0xff
/*
* This routine handles interface switching for the peculiar hardware design
* on the F.G.I./Holtek HT-6560B VLB IDE interface.
* The HT-6560B can only enable one IDE port at a time, and requires a
* silly sequence (below) whenever we switch between primary and secondary.
*/
/*
* This routine is invoked from ide.c to prepare for access to a given drive.
*/
static void ht6560b_selectproc (ide_drive_t *drive)
{
unsigned long flags;
static byte current_select = 0;
static byte current_timing = 0;
byte select, timing;
__save_flags (flags); /* local CPU only */
__cli(); /* local CPU only */
select = HT_CONFIG(drive);
timing = HT_TIMING(drive);
if (select != current_select || timing != current_timing) {
current_select = select;
current_timing = timing;
if (drive->media != ide_disk || !drive->present)
select |= HT_PREFETCH_MODE;
(void) inb(HT_CONFIG_PORT);
(void) inb(HT_CONFIG_PORT);
(void) inb(HT_CONFIG_PORT);
(void) inb(HT_CONFIG_PORT);
outb(select, HT_CONFIG_PORT);
/*
* Set timing for this drive:
*/
outb(timing, IDE_SELECT_REG);
(void) inb(IDE_STATUS_REG);
#ifdef DEBUG
printk("ht6560b: %s: select=%#x timing=%#x\n", drive->name, select, timing);
#endif
}
__restore_flags (flags); /* local CPU only */
}
/*
* Autodetection and initialization of ht6560b
*/
static int __init try_to_init_ht6560b(void)
{
byte orig_value;
int i;
/* Autodetect ht6560b */
if ((orig_value=inb(HT_CONFIG_PORT)) == 0xff)
return 0;
for (i=3;i>0;i--) {
outb(0x00, HT_CONFIG_PORT);
if (!( (~inb(HT_CONFIG_PORT)) & 0x3f )) {
outb(orig_value, HT_CONFIG_PORT);
return 0;
}
}
outb(0x00, HT_CONFIG_PORT);
if ((~inb(HT_CONFIG_PORT))& 0x3f) {
outb(orig_value, HT_CONFIG_PORT);
return 0;
}
/*
* Ht6560b autodetected
*/
outb(HT_CONFIG_DEFAULT, HT_CONFIG_PORT);
outb(HT_TIMING_DEFAULT, 0x1f6); /* IDE_SELECT_REG */
(void) inb(0x1f7); /* IDE_STATUS_REG */
printk("\nht6560b " HT6560B_VERSION
": chipset detected and initialized"
#ifdef DEBUG
" with debug enabled"
#endif
);
return 1;
}
static byte ht_pio2timings(ide_drive_t *drive, byte pio)
{
int active_time, recovery_time;
int active_cycles, recovery_cycles;
ide_pio_data_t d;
int bus_speed = system_bus_clock();
if (pio) {
pio = ide_get_best_pio_mode(drive, pio, 5, &d);
/*
* Just like opti621.c we try to calculate the
* actual cycle time for recovery and activity
* according system bus speed.
*/
active_time = ide_pio_timings[pio].active_time;
recovery_time = d.cycle_time
- active_time
- ide_pio_timings[pio].setup_time;
/*
* Cycle times should be Vesa bus cycles
*/
active_cycles = (active_time * bus_speed + 999) / 1000;
recovery_cycles = (recovery_time * bus_speed + 999) / 1000;
/*
* Upper and lower limits
*/
if (active_cycles < 2) active_cycles = 2;
if (recovery_cycles < 2) recovery_cycles = 2;
if (active_cycles > 15) active_cycles = 15;
if (recovery_cycles > 15) recovery_cycles = 0; /* 0==16 */
#ifdef DEBUG
printk("ht6560b: drive %s setting pio=%d recovery=%d (%dns) active=%d (%dns)\n", drive->name, pio, recovery_cycles, recovery_time, active_cycles, active_time);
#endif
return (byte)((recovery_cycles << 4) | active_cycles);
} else {
#ifdef DEBUG
printk("ht6560b: drive %s setting pio=0\n", drive->name);
#endif
return HT_TIMING_DEFAULT; /* default setting */
}
}
/*
* Enable/Disable so called prefetch mode
*/
static void ht_set_prefetch(ide_drive_t *drive, byte state)
{
unsigned long flags;
int t = HT_PREFETCH_MODE << 8;
save_flags (flags); /* all CPUs */
cli(); /* all CPUs */
/*
* Prefetch mode and unmask irq seems to conflict
*/
if (state) {
drive->drive_data |= t; /* enable prefetch mode */
drive->no_unmask = 1;
drive->unmask = 0;
} else {
drive->drive_data &= ~t; /* disable prefetch mode */
drive->no_unmask = 0;
}
restore_flags (flags); /* all CPUs */
#ifdef DEBUG
printk("ht6560b: drive %s prefetch mode %sabled\n", drive->name, (state ? "en" : "dis"));
#endif
}
static void tune_ht6560b (ide_drive_t *drive, byte pio)
{
unsigned long flags;
byte timing;
switch (pio) {
case 8: /* set prefetch off */
case 9: /* set prefetch on */
ht_set_prefetch(drive, pio & 1);
return;
}
timing = ht_pio2timings(drive, pio);
save_flags (flags); /* all CPUs */
cli(); /* all CPUs */
drive->drive_data &= 0xff00;
drive->drive_data |= timing;
restore_flags (flags); /* all CPUs */
#ifdef DEBUG
printk("ht6560b: drive %s tuned to pio mode %#x timing=%#x\n", drive->name, pio, timing);
#endif
}
void __init init_ht6560b (void)
{
int t;
if (check_region(HT_CONFIG_PORT,1)) {
printk(KERN_ERR "ht6560b: PORT %#x ALREADY IN USE\n", HT_CONFIG_PORT);
} else {
if (try_to_init_ht6560b()) {
request_region(HT_CONFIG_PORT, 1, ide_hwifs[0].name);
ide_hwifs[0].chipset = ide_ht6560b;
ide_hwifs[1].chipset = ide_ht6560b;
ide_hwifs[0].selectproc = &ht6560b_selectproc;
ide_hwifs[1].selectproc = &ht6560b_selectproc;
ide_hwifs[0].tuneproc = &tune_ht6560b;
ide_hwifs[1].tuneproc = &tune_ht6560b;
ide_hwifs[0].serialized = 1; /* is this needed? */
ide_hwifs[1].serialized = 1; /* is this needed? */
ide_hwifs[0].mate = &ide_hwifs[1];
ide_hwifs[1].mate = &ide_hwifs[0];
ide_hwifs[1].channel = 1;
/*
* Setting default configurations for drives
*/
t = (HT_CONFIG_DEFAULT << 8);
t |= HT_TIMING_DEFAULT;
ide_hwifs[0].drives[0].drive_data = t;
ide_hwifs[0].drives[1].drive_data = t;
t |= (HT_SECONDARY_IF << 8);
ide_hwifs[1].drives[0].drive_data = t;
ide_hwifs[1].drives[1].drive_data = t;
} else
printk(KERN_ERR "ht6560b: not found\n");
}
}
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