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linux/drivers/ide/ht6560b.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 1995-2000 Linus Torvalds & author (see below)
*/
/*
* 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 <j.e.van.grootheest@caiway.nl>
*
*/
#define DRV_NAME "ht6560b"
#define HT6560B_VERSION "v0.08"
#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/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
static inline u8 HT_CONFIG(ide_drive_t *drive)
{
return ((unsigned long)ide_get_drivedata(drive) & 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 Select register 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.
*/
static inline u8 HT_TIMING(ide_drive_t *drive)
{
return (unsigned long)ide_get_drivedata(drive) & 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_dev_select(ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
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);
/*
* Need to enforce prefetch sometimes because otherwise
* it'll hang (hard).
*/
if (drive->media != ide_disk ||
(drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
select |= HT_PREFETCH_MODE;
if (select != current_select || timing != current_timing) {
current_select = select;
current_timing = timing;
(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, hwif->io_ports.device_addr);
(void)inb(hwif->io_ports.status_addr);
#ifdef DEBUG
printk("ht6560b: %s: select=%#x timing=%#x\n",
drive->name, select, timing);
#endif
}
local_irq_restore(flags);
outb(drive->select | ATA_DEVICE_OBS, hwif->io_ports.device_addr);
}
/*
* 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); /* Select register */
(void)inb(0x1f7); /* Status register */
printk("ht6560b " HT6560B_VERSION
": chipset detected and initialized"
#ifdef DEBUG
" with debug enabled"
#endif
"\n"
);
return 1;
}
static u8 ht_pio2timings(ide_drive_t *drive, const u8 pio)
{
int active_time, recovery_time;
int active_cycles, recovery_cycles;
int bus_speed = ide_vlb_clk ? ide_vlb_clk : 50;
if (pio) {
unsigned int cycle_time;
struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
cycle_time = ide_pio_cycle_time(drive, pio);
/*
* Just like opti621.c we try to calculate the
* actual cycle time for recovery and activity
* according system bus speed.
*/
active_time = t->active;
recovery_time = cycle_time - active_time - t->setup;
/*
* 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 */
}
}
static DEFINE_SPINLOCK(ht6560b_lock);
/*
* Enable/Disable so called prefetch mode
*/
static void ht_set_prefetch(ide_drive_t *drive, u8 state)
{
unsigned long flags, config;
int t = HT_PREFETCH_MODE << 8;
spin_lock_irqsave(&ht6560b_lock, flags);
config = (unsigned long)ide_get_drivedata(drive);
/*
* Prefetch mode and unmask irq seems to conflict
*/
if (state) {
config |= t; /* enable prefetch mode */
drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
drive->dev_flags &= ~IDE_DFLAG_UNMASK;
} else {
config &= ~t; /* disable prefetch mode */
drive->dev_flags &= ~IDE_DFLAG_NO_UNMASK;
}
ide_set_drivedata(drive, (void *)config);
spin_unlock_irqrestore(&ht6560b_lock, flags);
#ifdef DEBUG
printk("ht6560b: drive %s prefetch mode %sabled\n", drive->name, (state ? "en" : "dis"));
#endif
}
static void ht6560b_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
{
unsigned long flags, config;
const u8 pio = drive->pio_mode - XFER_PIO_0;
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(&ht6560b_lock, flags);
config = (unsigned long)ide_get_drivedata(drive);
config &= 0xff00;
config |= timing;
ide_set_drivedata(drive, (void *)config);
spin_unlock_irqrestore(&ht6560b_lock, flags);
#ifdef DEBUG
printk("ht6560b: drive %s tuned to pio mode %#x timing=%#x\n", drive->name, pio, timing);
#endif
}
static void __init ht6560b_init_dev(ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
/* Setting default configurations for drives. */
unsigned long t = (HT_CONFIG_DEFAULT << 8) | HT_TIMING_DEFAULT;
if (hwif->channel)
t |= (HT_SECONDARY_IF << 8);
ide_set_drivedata(drive, (void *)t);
}
static bool probe_ht6560b;
module_param_named(probe, probe_ht6560b, bool, 0);
MODULE_PARM_DESC(probe, "probe for HT6560B chipset");
static const struct ide_tp_ops ht6560b_tp_ops = {
.exec_command = ide_exec_command,
.read_status = ide_read_status,
.read_altstatus = ide_read_altstatus,
.write_devctl = ide_write_devctl,
.dev_select = ht6560b_dev_select,
.tf_load = ide_tf_load,
.tf_read = ide_tf_read,
.input_data = ide_input_data,
.output_data = ide_output_data,
};
static const struct ide_port_ops ht6560b_port_ops = {
.init_dev = ht6560b_init_dev,
.set_pio_mode = ht6560b_set_pio_mode,
};
static const struct ide_port_info ht6560b_port_info __initconst = {
.name = DRV_NAME,
.chipset = ide_ht6560b,
.tp_ops = &ht6560b_tp_ops,
.port_ops = &ht6560b_port_ops,
.host_flags = IDE_HFLAG_SERIALIZE | /* is this needed? */
IDE_HFLAG_NO_DMA |
IDE_HFLAG_ABUSE_PREFETCH,
.pio_mask = ATA_PIO4,
};
static int __init ht6560b_init(void)
{
if (probe_ht6560b == 0)
return -ENODEV;
if (!request_region(HT_CONFIG_PORT, 1, DRV_NAME)) {
printk(KERN_NOTICE "%s: HT_CONFIG_PORT not found\n",
__func__);
return -ENODEV;
}
if (!try_to_init_ht6560b()) {
printk(KERN_NOTICE "%s: HBA not found\n", __func__);
goto release_region;
}
return ide_legacy_device_add(&ht6560b_port_info, 0);
release_region:
release_region(HT_CONFIG_PORT, 1);
return -ENODEV;
}
module_init(ht6560b_init);
MODULE_AUTHOR("See Local File");
MODULE_DESCRIPTION("HT-6560B EIDE-controller support");
MODULE_LICENSE("GPL");
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