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linux-next/drivers/ide/legacy/ht6560b.c
Bartlomiej Zolnierkiewicz 849138827c ide: make legacy IDE VLB modules check for the "probe" kernel params (v2)
Legacy IDE VLB host drivers didn't check for "probe" options when compiled
as modules, which was obviously wrong as we don't want module to poke at
random I/O ports by simply loading it.  Fix it by adding "probe" module param
to legacy IDE VLB host drivers.

v2:
* don't obsolete old "ide0=dtc2278/ht6560b/qd65xx/ali14xx/umc8672"
  IDE driver options yet (per Alan Cox's request) and enhance documentation

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
2007-03-03 17:48:55 +01:00

376 lines
10 KiB
C

/*
* linux/drivers/ide/legacy/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"
#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/io.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) (u8)(((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) (u8)((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 u8 current_select = 0;
static u8 current_timing = 0;
u8 select, timing;
local_irq_save(flags);
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
}
local_irq_restore(flags);
}
/*
* Autodetection and initialization of ht6560b
*/
static int __init try_to_init_ht6560b(void)
{
u8 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 u8 ht_pio2timings(ide_drive_t *drive, u8 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 (u8)((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, u8 state)
{
unsigned long flags;
int t = HT_PREFETCH_MODE << 8;
spin_lock_irqsave(&ide_lock, flags);
/*
* 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;
}
spin_unlock_irqrestore(&ide_lock, flags);
#ifdef DEBUG
printk("ht6560b: drive %s prefetch mode %sabled\n", drive->name, (state ? "en" : "dis"));
#endif
}
static void tune_ht6560b (ide_drive_t *drive, u8 pio)
{
unsigned long flags;
u8 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);
spin_lock_irqsave(&ide_lock, flags);
drive->drive_data &= 0xff00;
drive->drive_data |= timing;
spin_unlock_irqrestore(&ide_lock, flags);
#ifdef DEBUG
printk("ht6560b: drive %s tuned to pio mode %#x timing=%#x\n", drive->name, pio, timing);
#endif
}
int probe_ht6560b = 0;
module_param_named(probe, probe_ht6560b, bool, 0);
MODULE_PARM_DESC(probe, "probe for HT6560B chipset");
/* Can be called directly from ide.c. */
int __init ht6560b_init(void)
{
ide_hwif_t *hwif, *mate;
int t;
if (probe_ht6560b == 0)
return -ENODEV;
hwif = &ide_hwifs[0];
mate = &ide_hwifs[1];
if (!request_region(HT_CONFIG_PORT, 1, hwif->name)) {
printk(KERN_NOTICE "%s: HT_CONFIG_PORT not found\n",
__FUNCTION__);
return -ENODEV;
}
if (!try_to_init_ht6560b()) {
printk(KERN_NOTICE "%s: HBA not found\n", __FUNCTION__);
goto release_region;
}
hwif->chipset = ide_ht6560b;
hwif->selectproc = &ht6560b_selectproc;
hwif->tuneproc = &tune_ht6560b;
hwif->serialized = 1; /* is this needed? */
hwif->mate = mate;
mate->chipset = ide_ht6560b;
mate->selectproc = &ht6560b_selectproc;
mate->tuneproc = &tune_ht6560b;
mate->serialized = 1; /* is this needed? */
mate->mate = hwif;
mate->channel = 1;
/*
* Setting default configurations for drives
*/
t = (HT_CONFIG_DEFAULT << 8);
t |= HT_TIMING_DEFAULT;
hwif->drives[0].drive_data = t;
hwif->drives[1].drive_data = t;
t |= (HT_SECONDARY_IF << 8);
mate->drives[0].drive_data = t;
mate->drives[1].drive_data = t;
probe_hwif_init(hwif);
probe_hwif_init(mate);
create_proc_ide_interfaces();
return 0;
release_region:
release_region(HT_CONFIG_PORT, 1);
return -ENODEV;
}
#ifdef MODULE
module_init(ht6560b_init);
#endif
MODULE_AUTHOR("See Local File");
MODULE_DESCRIPTION("HT-6560B EIDE-controller support");
MODULE_LICENSE("GPL");