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/*

 *  linux/drivers/block/ht6580.c       Version 0.04  Mar 19, 1996

 *

 *  Copyright (C) 1995-1996  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

 *

 * 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.

 *

 * Port 0x3e6 bit 0x20 sets these timings on/off. If 0x20 bit is set

 * these timings are disabled.

 *

 * Mikko Ala-Fossi

 *

 * More notes:

 *

 * There's something still missing from the initialization code, though.

 * If I have booted to dos sometime after power on, I can get smaller

 * timing values working. Perhaps I could soft-ice the initialization.

 *

 * -=- malafoss@snakemail.hut.fi -=- searching the marvels of universe -=-

 */

#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"

/*

 * 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 stuff is courtesy of malafoss@snakemail.hut.fi

 *                          (or maf@nemesis.tky.hut.fi)

 *

 * At least one user has reported that this code can confuse the floppy

 * controller and/or driver -- perhaps this should be changed to use

 * a read-modify-write sequence, so as not to disturb other bits in the reg?

 */

/*

 * The special i/o-port that HT-6560B uses to select interfaces:

 */

#define HT_SELECT_PORT     0x3e6

/*

 * We don't know what all of the bits are for, but we *do* know about these:

 *      bit5 (0x20): "1" selects slower speed by disabling use of timing values

 *      bit0 (0x01): "1" selects second interface

 */

static byte ht6560b_selects [2][MAX_DRIVES] = {{0x3c,0x3c}, {0x3d,0x3d}};

/*

 * VLB ht6560b Timing values:

 *

 * Timing byte consists of

 *      High nibble:  Recovery Time  (rt)

 *           The valid values range from 2 to 15. The default is 15.

 *

 *      Low nibble:   Active 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.

 *

 * Hopefully this example will make it clearer:

 *

 * DOS:    DEVICE=C:\bin\HTIDE\HTIDE.SYS /D0=2,4 /D1=4,5 /D2=10,10 /D3=15,15

 * Linux:  byte ht6560b_timings [][] = {{0x24, 0x45}, {0xaa, 0xff}};

 *

 * Note: There are no ioctls to change these values directly,

 * but settings can be approximated as PIO modes, using "hdparm":

 *

 * rc.local:  hdparm -p3 /dev/hda -p2 /dev/hdb -p1 /dev/hdc -p0 /dev/hdd

 */

static byte ht6560b_timings [2][MAX_DRIVES] = {{0xff,0xff}, {0xff,0xff}};

static byte pio_to_timings[6] = {0xff, 0xaa, 0x45, 0x24, 0x13, 0x12};

/*

 * This routine is invoked from ide.c to prepare for access to a given drive.

 */

static void ht6560b_selectproc (ide_drive_t *drive)

{

        byte t;

        unsigned long flags;

        static byte current_select = 0;

        static byte current_timing = 0;

        byte select = ht6560b_selects[HWIF(drive)->index][drive->select.b.unit];

        byte timing = ht6560b_timings[HWIF(drive)->index][drive->select.b.unit];

        if (select != current_select || timing != current_timing) {

                current_select = select;

                current_timing = timing;

                save_flags (flags);

                cli();

                (void) inb(HT_SELECT_PORT);

                (void) inb(HT_SELECT_PORT);

                (void) inb(HT_SELECT_PORT);

                /*

                 * Note: input bits are reversed to output bits!!

                 */

                t = inb(HT_SELECT_PORT) ^ 0x3f;

                t &= (~0x21);

                t |= (current_select & 0x21);

                outb(t, HT_SELECT_PORT);

                /*

                 * Set timing for this drive:

                 */

                outb (timing, IDE_SELECT_REG);

                (void) inb (IDE_STATUS_REG);

                restore_flags (flags);

#ifdef DEBUG

                printk("ht6560b: %s: select=%#x timing=%#x\n", drive->name, t, timing);

#endif

        }

        OUT_BYTE(drive->select.all,IDE_SELECT_REG);

}

/*

 * Autodetection and initialization of ht6560b

 */

int try_to_init_ht6560b(void)

{

        byte orig_value;

        int i;

        /* Autodetect ht6560b */

        if ((orig_value=inb(HT_SELECT_PORT)) == 0xff)

                return 0;

        for (i=3;i>0;i--) {

                outb(0x00, HT_SELECT_PORT);

                if (!( (~inb(HT_SELECT_PORT)) & 0x3f )) {

                          outb(orig_value, HT_SELECT_PORT);

                          return 0;

                }

        }

        outb(0x00, HT_SELECT_PORT);

        if ((~inb(HT_SELECT_PORT))& 0x3f) {

                outb(orig_value, HT_SELECT_PORT);

                return 0;

        }

        /*

         * Ht6560b autodetected:

         *     reverse input bits to output bits

         *     initialize bit1 to 0

         */

        outb((orig_value ^ 0x3f) & 0xfd, HT_SELECT_PORT);

        printk("\nht6560b: detected and initialized");

        return 1;

}

static void tune_ht6560b (ide_drive_t *drive, byte pio)

{

        unsigned int hwif, unit;

        if (pio == 255)  {      /* auto-tune */

                if (drive->media != ide_disk)

                        pio = 0; /* some cdroms don't like fast modes (?) */

                else

                        pio = ide_get_best_pio_mode(drive, pio, 5, NULL);

        }

        unit = drive->select.b.unit;

        hwif = HWIF(drive)->index;

        ht6560b_timings[hwif][unit] = pio_to_timings[pio];

        if (pio == 0)

                ht6560b_selects[hwif][unit] |= 0x20;

        else

                ht6560b_selects[hwif][unit] &= ~0x20;

}

void init_ht6560b (void)

{

        if (check_region(HT_SELECT_PORT,1)) {

                printk("\nht6560b: PORT 0x3e6 ALREADY IN USE\n");

        } else {

                if (try_to_init_ht6560b()) {

                        request_region(HT_SELECT_PORT, 1, ide_hwifs[0].name);

                        ide_hwifs[0].chipset = ide_ht6560b;

                        ide_hwifs[1].chipset = ide_ht6560b;

                        ide_hwifs[0].selectproc = &ht6560b_selectproc;

                        ide_hwifs[1].selectproc = &ht6560b_selectproc;

                        ide_hwifs[0].tuneproc = &tune_ht6560b;

                        ide_hwifs[1].tuneproc = &tune_ht6560b;

                        ide_hwifs[0].serialized = 1;

                        ide_hwifs[1].serialized = 1;

                } else

                        printk("\nht6560b: not found\n");

        }

}