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/*

        fit2.c        (c) 1998  Grant R. Guenther <grant@torque.net>

                          Under the terms of the GNU public license.

        fit2.c is a low-level protocol driver for the older version

        of the Fidelity International Technology parallel port adapter.

        This adapter is used in their TransDisk 2000 and older TransDisk

        3000 portable hard-drives.  As far as I can tell, this device

        supports 4-bit mode _only_.

        Newer models of the FIT products use an enhanced protocol.

        The "fit3" protocol module should support current drives.

*/

#define FIT2_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

NB:  The FIT adapter does not appear to use the control registers.

So, we map ALT_STATUS to STATUS and NO-OP writes to the device

control register - this means that IDE reset will not work on these

devices.

*/

static void  fit2_write_regr( PIA *pi, int cont, int regr, int val)

{       if (cont == 1) return;

        w2(0xc); w0(regr); w2(4); w0(val); w2(5); w0(0); w2(4);

}

static int fit2_read_regr( PIA *pi, int cont, int regr )

{       int  a, b, r;

        if (cont) {

          if (regr != 6) return 0xff;

          r = 7;

        } else r = regr + 0x10;

        w2(0xc); w0(r); w2(4); w2(5);

                 w0(0); a = r1();

                 w0(1); b = r1();

        w2(4);

        return j44(a,b);

}

static void fit2_read_block( PIA *pi, char * buf, int count )

{       int  k, a, b, c, d;

        w2(0xc); w0(0x10);

        for (k=0;k<count/4;k++) {

                w2(4); w2(5);

                w0(0); a = r1(); w0(1); b = r1();

                w0(3); c = r1(); w0(2); d = r1();

                buf[4*k+0] = j44(a,b);

                buf[4*k+1] = j44(d,c);

                w2(4); w2(5);

                       a = r1(); w0(3); b = r1();

                w0(1); c = r1(); w0(0); d = r1();

                buf[4*k+2] = j44(d,c);

                buf[4*k+3] = j44(a,b);

        }

        w2(4);

}

static void fit2_write_block( PIA *pi, char * buf, int count )

{       int k;

        w2(0xc); w0(0);

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

                w2(4); w0(buf[2*k]);

                w2(5); w0(buf[2*k+1]);

        }

        w2(4);

}

static void fit2_connect ( PIA *pi  )

{       pi->saved_r0 = r0();

        pi->saved_r2 = r2();

        w2(0xcc);

}

static void fit2_disconnect ( PIA *pi )

{       w0(pi->saved_r0);

        w2(pi->saved_r2);

}

static void fit2_log_adapter( PIA *pi, char * scratch, int verbose )

{       printk("%s: fit2 %s, FIT 2000 adapter at 0x%x, delay %d\n",

                pi->device,FIT2_VERSION,pi->port,pi->delay);

}

static void fit2_init_proto( PIA *pi)

{       MOD_INC_USE_COUNT;

}

static void fit2_release_proto( PIA *pi)

{       MOD_DEC_USE_COUNT;

}

struct pi_protocol fit2 = {"fit2",0,1,2,1,1,

                           fit2_write_regr,

                           fit2_read_regr,

                           fit2_write_block,

                           fit2_read_block,

                           fit2_connect,

                           fit2_disconnect,

                           0,

                           0,

                           0,

                           fit2_log_adapter,

                           fit2_init_proto,

                           fit2_release_proto

                          };

#ifdef MODULE

int     init_module(void)

{       return pi_register( &fit2 ) - 1;

}

void    cleanup_module(void)

{       pi_unregister( &fit2 );

}

#endif

/* end of fit2.c */