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/*

        dstr.c    (c) 1997-8  Grant R. Guenther <grant@torque.net>

                              Under the terms of the GNU public license.

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

        DataStor EP2000 parallel to IDE adapter chip.

*/

/* Changes:

        1.01    GRG 1998.05.06 init_proto, release_proto

*/

#define DSTR_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"

/* mode codes:  0  nybble reads, 8-bit writes

                1  8-bit reads and writes

                2  8-bit EPP mode

                3  EPP-16

                4  EPP-32

*/

#define j44(a,b)  (((a>>3)&0x07)|((~a>>4)&0x08)|((b<<1)&0x70)|((~b)&0x80))

#define P1      w2(5);w2(0xd);w2(5);w2(4);

#define P2      w2(5);w2(7);w2(5);w2(4);

#define P3      w2(6);w2(4);w2(6);w2(4);

/* cont = 0 - access the IDE register file

   cont = 1 - access the IDE command set

*/

static int  cont_map[2] = { 0x20, 0x40 };

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

{       int     a, b, r;

        r = regr + cont_map[cont];

        w0(0x81); P1;

        if (pi->mode) { w0(0x11); } else { w0(1); }

        P2; w0(r); P1;

        switch (pi->mode)  {

        case 0: w2(6); a = r1(); w2(4); w2(6); b = r1(); w2(4);

                return j44(a,b);

        case 1: w0(0); w2(0x26); a = r0(); w2(4);

                return a;

        case 2:

        case 3:

        case 4: w2(0x24); a = r4(); w2(4);

                return a;

        }

        return -1;

}

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

{       int  r;

        r = regr + cont_map[cont];

        w0(0x81); P1;

        if (pi->mode >= 2) { w0(0x11); } else { w0(1); }

        P2; w0(r); P1;

        switch (pi->mode)  {

        case 0:

        case 1: w0(val); w2(5); w2(7); w2(5); w2(4);

                break;

        case 2:

        case 3:

        case 4: w4(val);

                break;

        }

}

#define  CCP(x)  w0(0xff);w2(0xc);w2(4);\

                 w0(0xaa);w0(0x55);w0(0);w0(0xff);w0(0x87);w0(0x78);\

                 w0(x);w2(5);w2(4);

static void dstr_connect ( PIA *pi  )

{       pi->saved_r0 = r0();

        pi->saved_r2 = r2();

        w2(4); CCP(0xe0); w0(0xff);

}

static void dstr_disconnect ( PIA *pi )

{       CCP(0x30);

        w0(pi->saved_r0);

        w2(pi->saved_r2);

}

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

{       int     k, a, b;

        w0(0x81); P1;

        if (pi->mode) { w0(0x19); } else { w0(9); }

        P2; w0(0x82); P1; P3; w0(0x20); P1;

        switch (pi->mode) {

        case 0: for (k=0;k<count;k++) {

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

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

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

                }

                break;

        case 1: w0(0);

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

                        w2(0x26); buf[k] = r0(); w2(0x24);

                }

                w2(4);

                break;

        case 2: w2(0x24);

                for (k=0;k<count;k++) buf[k] = r4();

                w2(4);

                break;

        case 3: w2(0x24);

                for (k=0;k<count/2;k++) ((u16 *)buf)[k] = r4w();

                w2(4);

                break;

        case 4: w2(0x24);

                for (k=0;k<count/4;k++) ((u32 *)buf)[k] = r4l();

                w2(4);

                break;

        }

}

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

{       int     k;

        w0(0x81); P1;

        if (pi->mode) { w0(0x19); } else { w0(9); }

        P2; w0(0x82); P1; P3; w0(0x20); P1;

        switch (pi->mode) {

        case 0:

        case 1: for (k=0;k<count;k++) {

                        w2(5); w0(buf[k]); w2(7);

                }

                w2(5); w2(4);

                break;

        case 2: w2(0xc5);

                for (k=0;k<count;k++) w4(buf[k]);

                w2(0xc4);

                break;

        case 3: w2(0xc5);

                for (k=0;k<count/2;k++) w4w(((u16 *)buf)[k]);

                w2(0xc4);

                break;

        case 4: w2(0xc5);

                for (k=0;k<count/4;k++) w4l(((u32 *)buf)[k]);

                w2(0xc4);

                break;

        }

}

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

{       char    *mode_string[5] = {"4-bit","8-bit","EPP-8",

                                   "EPP-16","EPP-32"};

        printk("%s: dstr %s, DataStor EP2000 at 0x%x, ",

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

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

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

}

static void dstr_init_proto( PIA *pi)

{       MOD_INC_USE_COUNT;

}

static void dstr_release_proto( PIA *pi)

{       MOD_DEC_USE_COUNT;

}

struct pi_protocol dstr = {"dstr",0,5,2,1,1,

                           dstr_write_regr,

                           dstr_read_regr,

                           dstr_write_block,

                           dstr_read_block,

                           dstr_connect,

                           dstr_disconnect,

                           0,

                           0,

                           0,

                           dstr_log_adapter,

                           dstr_init_proto,

                           dstr_release_proto

                          };

#ifdef MODULE

int     init_module(void)

{       return pi_register( &dstr ) - 1;

}

void    cleanup_module(void)

{       pi_unregister( &dstr );

}

#endif

/* end of dstr.c */