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/*

 *  linux/drivers/block/umc8672.c       Version 0.05  Jul 31, 1996

 *

 *  Copyright (C) 1995-1996  Linus Torvalds & author (see below)

 */

/*

 *  Principal Author/Maintainer:  PODIEN@hml2.atlas.de (Wolfram Podien)

 *

 *  This file provides support for the advanced features

 *  of the UMC 8672 IDE interface.

 *

 *  Version 0.01        Initial version, hacked out of ide.c,

 *                      and #include'd rather than compiled separately.

 *                      This will get cleaned up in a subsequent release.

 *

 *  Version 0.02        now configs/compiles separate from ide.c  -ml

 *  Version 0.03        enhanced auto-tune, fix display bug

 *  Version 0.05        replace sti() with restore_flags()  -ml

 *                      add detection of possible race condition  -ml

 */

/*

 * VLB Controller Support from

 * Wolfram Podien

 * Rohoefe 3

 * D28832 Achim

 * Germany

 *

 * To enable UMC8672 support there must a lilo line like

 * append="ide0=umc8672"...

 * To set the speed according to the abilities of the hardware there must be a

 * line like

 * #define UMC_DRIVE0 11

 * in the beginning of the driver, which sets the speed of drive 0 to 11 (there

 * are some lines present). 0 - 11 are allowed speed values. These values are

 * the results from the DOS speed test program supplied from UMC. 11 is the

 * highest speed (about PIO mode 3)

 */

#define REALLY_SLOW_IO          /* some 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"

/*

 * Default speeds.  These can be changed with "auto-tune" and/or hdparm.

 */

#define UMC_DRIVE0      1              /* DOS measured drive speeds */

#define UMC_DRIVE1      1              /* 0 to 11 allowed */

#define UMC_DRIVE2      1              /* 11 = Fastest Speed */

#define UMC_DRIVE3      1              /* In case of crash reduce speed */

static byte current_speeds[4] = {UMC_DRIVE0, UMC_DRIVE1, UMC_DRIVE2, UMC_DRIVE3};

static const byte pio_to_umc [5] = {0,3,7,10,11};        /* rough guesses */

/*       0    1    2    3    4    5    6    7    8    9    10   11      */

static const byte speedtab [3][12] = {

        {0xf, 0xb, 0x2, 0x2, 0x2, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1 },

        {0x3, 0x2, 0x2, 0x2, 0x2, 0x2, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1 },

        {0xff,0xcb,0xc0,0x58,0x36,0x33,0x23,0x22,0x21,0x11,0x10,0x0}};

static void out_umc (char port,char wert)

{

        outb_p (port,0x108);

        outb_p (wert,0x109);

}

static byte in_umc (char port)

{

        outb_p (port,0x108);

        return inb_p (0x109);

}

static void umc_set_speeds (byte speeds[])

{

        int i, tmp;

        outb_p (0x5A,0x108); /* enable umc */

        out_umc (0xd7,(speedtab[0][speeds[2]] | (speedtab[0][speeds[3]]<<4)));

        out_umc (0xd6,(speedtab[0][speeds[0]] | (speedtab[0][speeds[1]]<<4)));

        tmp = 0;

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

        {

                tmp = (tmp << 2) | speedtab[1][speeds[i]];

        }

        out_umc (0xdc,tmp);

        for (i = 0;i < 4; i++)

        {

                out_umc (0xd0+i,speedtab[2][speeds[i]]);

                out_umc (0xd8+i,speedtab[2][speeds[i]]);

        }

        outb_p (0xa5,0x108); /* disable umc */

        printk ("umc8672: drive speeds [0 to 11]: %d %d %d %d\n",

                speeds[0], speeds[1], speeds[2], speeds[3]);

}

static void tune_umc (ide_drive_t *drive, byte pio)

{

        unsigned long flags;

        ide_hwgroup_t *hwgroup = ide_hwifs[HWIF(drive)->index^1].hwgroup;

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

        printk("%s: setting umc8672 to PIO mode%d (speed %d)\n", drive->name, pio, pio_to_umc[pio]);

        save_flags(flags);

        cli();

        if (hwgroup && hwgroup->handler != NULL) {

                printk("umc8672: other interface is busy: exiting tune_umc()\n");

        } else {

                current_speeds[drive->name[2] - 'a'] = pio_to_umc[pio];

                umc_set_speeds (current_speeds);

        }

        restore_flags(flags);

}

void init_umc8672 (void)        /* called from ide.c */

{

        unsigned long flags;

        save_flags(flags);

        cli ();

        if (check_region(0x108, 2)) {

                restore_flags(flags);

                printk("\numc8672: PORTS 0x108-0x109 ALREADY IN USE\n");

                return;

        }

        outb_p (0x5A,0x108); /* enable umc */

        if (in_umc (0xd5) != 0xa0)

        {

                restore_flags(flags);

                printk ("umc8672: not found\n");

                return;

        }

        outb_p (0xa5,0x108); /* disable umc */

        umc_set_speeds (current_speeds);

        restore_flags(flags);

        request_region(0x108, 2, "umc8672");

        ide_hwifs[0].chipset = ide_umc8672;

        ide_hwifs[1].chipset = ide_umc8672;

        ide_hwifs[0].tuneproc = &tune_umc;

        ide_hwifs[1].tuneproc = &tune_umc;

}