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/*

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

                              Under the terms of the GNU public license.

        comm.c is a low-level protocol driver for some older models

        of the DataStor "Commuter" parallel to IDE adapter.  Some of

        the parallel port devices marketed by Arista currently

        use this adapter.

*/

/* Changes:

        1.01    GRG 1998.05.05  init_proto, release_proto

*/

#define COMM_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

*/

#define j44(a,b)        (((a>>3)&0x0f)|((b<<1)&0xf0))

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

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

/* cont = 0 - access the IDE register file

   cont = 1 - access the IDE command set

*/

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

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

{       int     l, h, r;

        r = regr + cont_map[cont];

        switch (pi->mode)  {

        case 0: w0(r); P1; w0(0);

                w2(6); l = r1(); w0(0x80); h = r1(); w2(4);

                return j44(l,h);

        case 1: w0(r+0x20); P1;

                w0(0); w2(0x26); h = r0(); w2(4);

                return h;

        case 2:

        case 3:

        case 4: w3(r+0x20); r1();

                w2(0x24); h = r4(); w2(4);

                return h;

        }

        return -1;

}

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

{       int  r;

        r = regr + cont_map[cont];

        switch (pi->mode)  {

        case 0:

        case 1: w0(r); P1; w0(val); P2;

                break;

        case 2:

        case 3:

        case 4: w3(r); r1(); w4(val);

                break;

        }

}

static void comm_connect ( PIA *pi  )

{       pi->saved_r0 = r0();

        pi->saved_r2 = r2();

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

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

        w2(4); w0(0x00); w2(6);

        w2(4); w0(0x87); w2(6);

        w2(4); w0(0xe0); w2(0xc); w2(0xc); w2(4);

}

static void comm_disconnect ( PIA *pi )

{       w2(0); w2(0); w2(0); w2(4);

        w0(pi->saved_r0);

        w2(pi->saved_r2);

}

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

{       int     i, l, h;

        switch (pi->mode) {

        case 0: w0(0x48); P1;

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

                        w0(0); w2(6); l = r1();

                        w0(0x80); h = r1(); w2(4);

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

                }

                break;

        case 1: w0(0x68); P1; w0(0);

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

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

                }

                w2(4);

                break;

        case 2: w3(0x68); r1(); w2(0x24);

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

                w2(4);

                break;

        case 3: w3(0x68); r1(); w2(0x24);

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

                w2(4);

                break;

        case 4: w3(0x68); r1(); w2(0x24);

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

                w2(4);

                break;

        }

}

/* NB: Watch out for the byte swapped writes ! */

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

{       int     k;

        switch (pi->mode) {

        case 0:

        case 1: w0(0x68); P1;

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

                        w2(5); w0(buf[k^1]); w2(7);

                }

                w2(5); w2(4);

                break;

        case 2: w3(0x48); r1();

                for (k=0;k<count;k++) w4(buf[k^1]);

                break;

        case 3: w3(0x48); r1();

                for (k=0;k<count/2;k++) w4w(pi_swab16(buf,k));

                break;

        case 4: w3(0x48); r1();

                for (k=0;k<count/4;k++) w4l(pi_swab32(buf,k));

                break;

        }

}

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

{       char    *mode_string[5] = {"4-bit","8-bit","EPP-8","EPP-16","EPP-32"};

        printk("%s: comm %s, DataStor Commuter at 0x%x, ",

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

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

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

}

static void comm_init_proto(PIA *pi)

{       MOD_INC_USE_COUNT;

}

static void comm_release_proto(PIA *pi)

{       MOD_DEC_USE_COUNT;

}

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

                           comm_write_regr,

                           comm_read_regr,

                           comm_write_block,

                           comm_read_block,

                           comm_connect,

                           comm_disconnect,

                           0,

                           0,

                           0,

                           comm_log_adapter,

                           comm_init_proto,

                           comm_release_proto

                          };

#ifdef MODULE

int     init_module(void)

{       return pi_register( &comm ) - 1;

}

void    cleanup_module(void)

{       pi_unregister( &comm );

}

#endif

/* end of comm.c */