1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
165 lines
3.9 KiB
C
165 lines
3.9 KiB
C
/*
|
|
* 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");
|