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/* 
        aten.c  (c) 1997-8  Grant R. Guenther <grant@torque.net>
                            Under the terms of the GNU public license.
 
	aten.c is a low-level protocol driver for the ATEN EH-100
	parallel port adapter.  The EH-100 supports 4-bit and 8-bit
        modes only.  There is also an EH-132 which supports EPP mode
        transfers.  The EH-132 is not yet supported.
 
*/
 
/* Changes:
 
	1.01	GRG 1998.05.05	init_proto, release_proto
 
*/
 
#define ATEN_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 j44(a,b)                ((((a>>4)&0x0f)|(b&0xf0))^0x88)
 
/* cont = 0 - access the IDE register file 
   cont = 1 - access the IDE command set 
*/
 
static int  cont_map[2] = { 0x08, 0x20 };
 
static void  aten_write_regr( PIA *pi, int cont, int regr, int val)
 
{	int r;
 
	r = regr + cont_map[cont] + 0x80;
 
	w0(r); w2(0xe); w2(6); w0(val); w2(7); w2(6); w2(0xc);
}
 
static int aten_read_regr( PIA *pi, int cont, int regr )
 
{	int  a, b, r;
 
        r = regr + cont_map[cont] + 0x40;
 
	switch (pi->mode) {
 
        case 0: w0(r); w2(0xe); w2(6); 
		w2(7); w2(6); w2(0);
		a = r1(); w0(0x10); b = r1(); w2(0xc);
		return j44(a,b);
 
        case 1: r |= 0x10;
		w0(r); w2(0xe); w2(6); w0(0xff); 
		w2(0x27); w2(0x26); w2(0x20);
		a = r0();
		w2(0x26); w2(0xc);
		return a;
	}
	return -1;
}
 
static void aten_read_block( PIA *pi, char * buf, int count )
 
{	int  k, a, b, c, d;
 
	switch (pi->mode) {
 
	case 0:	w0(0x48); w2(0xe); w2(6);
		for (k=0;k<count/2;k++) {
			w2(7); w2(6); w2(2);
			a = r1(); w0(0x58); b = r1();
			w2(0); d = r1(); w0(0x48); c = r1();
			buf[2*k] = j44(c,d);
			buf[2*k+1] = j44(a,b);
		}
		w2(0xc);
		break;
 
	case 1: w0(0x58); w2(0xe); w2(6);
		for (k=0;k<count/2;k++) {
			w2(0x27); w2(0x26); w2(0x22);
			a = r0(); w2(0x20); b = r0();
			buf[2*k] = b; buf[2*k+1] = a;
		}
		w2(0x26); w2(0xc);
		break;
	}
}
 
static void aten_write_block( PIA *pi, char * buf, int count )
 
{	int k;
 
	w0(0x88); w2(0xe); w2(6);
	for (k=0;k<count/2;k++) {
		w0(buf[2*k+1]); w2(0xe); w2(6);
		w0(buf[2*k]); w2(7); w2(6);
	}
	w2(0xc);
}
 
static void aten_connect ( PIA *pi  )
 
{       pi->saved_r0 = r0();
        pi->saved_r2 = r2();
	w2(0xc);	
}
 
static void aten_disconnect ( PIA *pi )
 
{       w0(pi->saved_r0);
        w2(pi->saved_r2);
} 
 
static void aten_log_adapter( PIA *pi, char * scratch, int verbose )
 
{       char    *mode_string[2] = {"4-bit","8-bit"};
 
        printk("%s: aten %s, ATEN EH-100 at 0x%x, ",
                pi->device,ATEN_VERSION,pi->port);
        printk("mode %d (%s), delay %d\n",pi->mode,
		mode_string[pi->mode],pi->delay);
 
}
 
static void aten_init_proto( PIA *pi )
 
{       MOD_INC_USE_COUNT;
}
 
static void aten_release_proto( PIA *pi )
 
{       MOD_DEC_USE_COUNT;
}
 
struct pi_protocol aten = {"aten",0,2,2,1,1,
                           aten_write_regr,
                           aten_read_regr,
                           aten_write_block,
                           aten_read_block,
                           aten_connect,
                           aten_disconnect,
                           0,
                           0,
                           0,
                           aten_log_adapter,
                           aten_init_proto,
                           aten_release_proto
                          };
 
 
#ifdef MODULE
 
int     init_module(void)
 
{       return pi_register( &aten ) - 1;
}
 
void    cleanup_module(void)
 
{       pi_unregister( &aten );
}
 
#endif
 
/* end of aten.c */