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/*

 *  linux/drivers/block/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/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 <asm/io.h>

#include "ide.h"

#include "ide_modes.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, byte pio)

{

        unsigned long flags;

        pio = ide_get_best_pio_mode(drive, pio, 4, NULL);

        if (pio >= 3) {

                save_flags(flags);

                cli();

                /*

                 * This enables PIO mode4 (3?) on the first interface

                 */

                sub22(1,0xc3);

                sub22(0,0xa0);

                restore_flags(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;

}

void init_dtc2278 (void)

{

        unsigned long flags;

        save_flags(flags);

        cli();

        /*

         * 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

        restore_flags(flags);

        ide_hwifs[0].serialized = 1;

        ide_hwifs[1].serialized = 1;

        ide_hwifs[0].chipset = ide_dtc2278;

        ide_hwifs[1].chipset = ide_dtc2278;

        ide_hwifs[0].tuneproc = &tune_dtc2278;

        ide_hwifs[0].drives[0].no_unmask = 1;

        ide_hwifs[0].drives[1].no_unmask = 1;

        ide_hwifs[1].drives[0].no_unmask = 1;

        ide_hwifs[1].drives[1].no_unmask = 1;

}