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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 */