/*
* linux/drivers/ide/legacy/dtc2278.c Version 0.02 Feb 10, 1996
*
* Copyright (C) 1996 Linus Torvalds & author (see below)
*/
#undef REALLY_SLOW_IO /* most systems can safely undef this */
#include <linux/module.h>
#include <linux/config.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>
/*
* Changing this #undef to #define may solve start up problems in some systems.
*/
#undef ALWAYS_SET_DTC2278_PIO_MODE
/*
* From: andy@cercle.cts.com (Dyan Wile)
*
* Below is a patch for DTC-2278 - alike software-programmable controllers
* The code enables the secondary IDE controller and the PIO4 (3?) timings on
* the primary (EIDE). You may probably have to enable the 32-bit support to
* get the full speed. You better get the disk interrupts disabled ( hdparm -u0
* /dev/hd.. ) for the drives connected to the EIDE interface. (I get my
* filesystem corrupted with -u1, but under heavy disk load only :-)
*
* This card is now forced to use the "serialize" feature,
* and irq-unmasking is disallowed. If io_32bit is enabled,
* it must be done for BOTH drives on each interface.
*
* This code was written for the DTC2278E, but might work with any of these:
*
* DTC2278S has only a single IDE interface.
* DTC2278D has two IDE interfaces and is otherwise identical to the S version.
* DTC2278E also has serial ports and a printer port
* DTC2278EB: has onboard BIOS, and "works like a charm" -- Kent Bradford <kent@theory.caltech.edu>
*
* There may be a fourth controller type. The S and D versions use the
* Winbond chip, and I think the E version does also.
*
*/
static void sub22 (char b, char c)
{
int i;
for(i = 0; i < 3; ++i) {
inb(0x3f6);
outb_p(b,0xb0);
inb(0x3f6);
outb_p(c,0xb4);
inb(0x3f6);
if(inb(0xb4) == c) {
outb_p(7,0xb0);
inb(0x3f6);
return; /* success */
}
}
}
static void tune_dtc2278 (ide_drive_t *drive, u8 pio)
{
unsigned long flags;
pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
if (pio >= 3) {
spin_lock_irqsave(&ide_lock, flags);
/*
* This enables PIO mode4 (3?) on the first interface
*/
sub22(1,0xc3);
sub22(0,0xa0);
spin_unlock_irqrestore(&ide_lock, flags);
} else {
/* we don't know how to set it back again.. */
}
/*
* 32bit I/O has to be enabled for *both* drives at the same time.
*/
drive->io_32bit = 1;
HWIF(drive)->drives[!drive->select.b.unit].io_32bit = 1;
}
static int __init probe_dtc2278(void)
{
unsigned long flags;
ide_hwif_t *hwif, *mate;
hwif = &ide_hwifs[0];
mate = &ide_hwifs[1];
if (hwif->chipset != ide_unknown || mate->chipset != ide_unknown)
return 1;
local_irq_save(flags);
/*
* This enables the second interface
*/
outb_p(4,0xb0);
inb(0x3f6);
outb_p(0x20,0xb4);
inb(0x3f6);
#ifdef ALWAYS_SET_DTC2278_PIO_MODE
/*
* This enables PIO mode4 (3?) on the first interface
* and may solve start-up problems for some people.
*/
sub22(1,0xc3);
sub22(0,0xa0);
#endif
local_irq_restore(flags);
hwif->serialized = 1;
hwif->chipset = ide_dtc2278;
hwif->tuneproc = &tune_dtc2278;
hwif->drives[0].no_unmask = 1;
hwif->drives[1].no_unmask = 1;
hwif->mate = mate;
mate->serialized = 1;
mate->chipset = ide_dtc2278;
mate->drives[0].no_unmask = 1;
mate->drives[1].no_unmask = 1;
mate->mate = hwif;
mate->channel = 1;
probe_hwif_init(hwif);
probe_hwif_init(mate);
create_proc_ide_interfaces();
return 0;
}
/* Can be called directly from ide.c. */
int __init dtc2278_init(void)
{
if (probe_dtc2278()) {
printk(KERN_ERR "dtc2278: ide interfaces already in use!\n");
return -EBUSY;
}
return 0;
}
#ifdef MODULE
module_init(dtc2278_init);
#endif
MODULE_AUTHOR("See Local File");
MODULE_DESCRIPTION("support of DTC-2278 VLB IDE chipsets");
MODULE_LICENSE("GPL");
