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/*

        ktti.c        (c) 1998  Grant R. Guenther <grant@torque.net>

                          Under the terms of the GNU public license.

        ktti.c is a low-level protocol driver for the KT Technology

        parallel port adapter.  This adapter is used in the "PHd"

        portable hard-drives.  As far as I can tell, this device

        supports 4-bit mode _only_.

*/

#define KTTI_VERSION      "1.0"

#include <linux/module.h>

#include <linux/delay.h>

#include <linux/kernel.h>

#include <linux/types.h>

#include <asm/io.h>

#include "paride.h"

#define j44(a,b)                (((a>>4)&0x0f)|(b&0xf0))

/* cont = 0 - access the IDE register file

   cont = 1 - access the IDE command set

*/

static int  cont_map[2] = { 0x10, 0x08 };

static void  ktti_write_regr( PIA *pi, int cont, int regr, int val)

{       int r;

        r = regr + cont_map[cont];

        w0(r); w2(0xb); w2(0xa); w2(3); w2(6);

        w0(val); w2(3); w0(0); w2(6); w2(0xb);

}

static int ktti_read_regr( PIA *pi, int cont, int regr )

{       int  a, b, r;

        r = regr + cont_map[cont];

        w0(r); w2(0xb); w2(0xa); w2(9); w2(0xc); w2(9);

        a = r1(); w2(0xc);  b = r1(); w2(9); w2(0xc); w2(9);

        return j44(a,b);

}

static void ktti_read_block( PIA *pi, char * buf, int count )

{       int  k, a, b;

        for (k=0;k<count/2;k++) {

                w0(0x10); w2(0xb); w2(0xa); w2(9); w2(0xc); w2(9);

                a = r1(); w2(0xc); b = r1(); w2(9);

                buf[2*k] = j44(a,b);

                a = r1(); w2(0xc); b = r1(); w2(9);

                buf[2*k+1] = j44(a,b);

        }

}

static void ktti_write_block( PIA *pi, char * buf, int count )

{       int k;

        for (k=0;k<count/2;k++) {

                w0(0x10); w2(0xb); w2(0xa); w2(3); w2(6);

                w0(buf[2*k]); w2(3);

                w0(buf[2*k+1]); w2(6);

                w2(0xb);

        }

}

static void ktti_connect ( PIA *pi  )

{       pi->saved_r0 = r0();

        pi->saved_r2 = r2();

        w2(0xb); w2(0xa); w0(0); w2(3); w2(6);

}

static void ktti_disconnect ( PIA *pi )

{       w2(0xb); w2(0xa); w0(0xa0); w2(3); w2(4);

        w0(pi->saved_r0);

        w2(pi->saved_r2);

}

static void ktti_log_adapter( PIA *pi, char * scratch, int verbose )

{       printk("%s: ktti %s, KT adapter at 0x%x, delay %d\n",

                pi->device,KTTI_VERSION,pi->port,pi->delay);

}

static void ktti_init_proto( PIA *pi)

{       MOD_INC_USE_COUNT;

}

static void ktti_release_proto( PIA *pi)

{       MOD_DEC_USE_COUNT;

}

struct pi_protocol ktti = {"ktti",0,1,2,1,1,

                           ktti_write_regr,

                           ktti_read_regr,

                           ktti_write_block,

                           ktti_read_block,

                           ktti_connect,

                           ktti_disconnect,

                           0,

                           0,

                           0,

                           ktti_log_adapter,

                           ktti_init_proto,

                           ktti_release_proto

                          };

#ifdef MODULE

int     init_module(void)

{       return pi_register( &ktti ) - 1;

}

void    cleanup_module(void)

{       pi_unregister( &ktti );

}

#endif

/* end of ktti.c */