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/*

        on20.c  (c) 1996-8  Grant R. Guenther <grant@torque.net>

                            Under the terms of the GNU public license.

        on20.c is a low-level protocol driver for the

        Onspec 90c20 parallel to IDE adapter.

*/

/* Changes:

        1.01    GRG 1998.05.06 init_proto, release_proto

*/

#define ON20_VERSION    "1.01"

#include <linux/module.h>

#include <linux/delay.h>

#include <linux/kernel.h>

#include <linux/types.h>

#include <asm/io.h>

#include "paride.h"

#define op(f)   w2(4);w0(f);w2(5);w2(0xd);w2(5);w2(0xd);w2(5);w2(4);

#define vl(v)   w2(4);w0(v);w2(5);w2(7);w2(5);w2(4);

#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 on20_read_regr( PIA *pi, int cont, int regr )

{       int h,l, r ;

        r = (regr<<2) + 1 + cont;

        op(1); vl(r); op(0);

        switch (pi->mode)  {

        case 0:  w2(4); w2(6); l = r1();

                 w2(4); w2(6); h = r1();

                 w2(4); w2(6); w2(4); w2(6); w2(4);

                 return j44(l,h);

        case 1:  w2(4); w2(0x26); r = r0();

                 w2(4); w2(0x26); w2(4);

                 return r;

        }

        return -1;

}

static void on20_write_regr( PIA *pi, int cont, int regr, int val )

{       int r;

        r = (regr<<2) + 1 + cont;

        op(1); vl(r);

        op(0); vl(val);

        op(0); vl(val);

}

static void on20_connect ( PIA *pi)

{       pi->saved_r0 = r0();

        pi->saved_r2 = r2();

        w2(4);w0(0);w2(0xc);w2(4);w2(6);w2(4);w2(6);w2(4);

        if (pi->mode) { op(2); vl(8); op(2); vl(9); }

               else   { op(2); vl(0); op(2); vl(8); }

}

static void on20_disconnect ( PIA *pi )

{       w2(4);w0(7);w2(4);w2(0xc);w2(4);

        w0(pi->saved_r0);

        w2(pi->saved_r2);

}

static void on20_read_block( PIA *pi, char * buf, int count )

{       int     k, l, h;

        op(1); vl(1); op(0);

        for (k=0;k<count;k++)

            if (pi->mode) {

                w2(4); w2(0x26); buf[k] = r0();

            } else {

                w2(6); l = r1(); w2(4);

                w2(6); h = r1(); w2(4);

                buf[k] = j44(l,h);

            }

        w2(4);

}

static void on20_write_block(  PIA *pi, char * buf, int count )

{       int     k;

        op(1); vl(1); op(0);

        for (k=0;k<count;k++) { w2(5); w0(buf[k]); w2(7); }

        w2(4);

}

static void on20_log_adapter( PIA *pi, char * scratch, int verbose )

{       char    *mode_string[2] = {"4-bit","8-bit"};

        printk("%s: on20 %s, OnSpec 90c20 at 0x%x, ",

                pi->device,ON20_VERSION,pi->port);

        printk("mode %d (%s), delay %d\n",pi->mode,

                mode_string[pi->mode],pi->delay);

}

static void on20_init_proto( PIA *pi)

{       MOD_INC_USE_COUNT;

}

static void on20_release_proto( PIA *pi)

{       MOD_DEC_USE_COUNT;

}

struct pi_protocol on20 = {"on20",0,2,2,1,1,

                           on20_write_regr,

                           on20_read_regr,

                           on20_write_block,

                           on20_read_block,

                           on20_connect,

                           on20_disconnect,

                           0,

                           0,

                           0,

                           on20_log_adapter,

                           on20_init_proto,

                           on20_release_proto

                          };

#ifdef MODULE

int     init_module(void)

{       return pi_register( &on20 ) - 1;

}

void    cleanup_module(void)

{       pi_unregister( &on20 );

}

#endif

/* end of on20.c */