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/* 
        fit2.c        (c) 1998  Grant R. Guenther <grant@torque.net>
                          Under the terms of the GNU public license.
 
	fit2.c is a low-level protocol driver for the older version
        of the Fidelity International Technology parallel port adapter.  
	This adapter is used in their TransDisk 2000 and older TransDisk
	3000 portable hard-drives.  As far as I can tell, this device
	supports 4-bit mode _only_.  
 
	Newer models of the FIT products use an enhanced protocol.
	The "fit3" protocol module should support current drives.
 
*/
 
#define FIT2_VERSION      "1.0"
 
#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))
 
/* cont = 0 - access the IDE register file 
   cont = 1 - access the IDE command set 
 
NB:  The FIT adapter does not appear to use the control registers.
So, we map ALT_STATUS to STATUS and NO-OP writes to the device
control register - this means that IDE reset will not work on these
devices.
 
*/
 
static void  fit2_write_regr( PIA *pi, int cont, int regr, int val)
 
{	if (cont == 1) return;
	w2(0xc); w0(regr); w2(4); w0(val); w2(5); w0(0); w2(4);
}
 
static int fit2_read_regr( PIA *pi, int cont, int regr )
 
{	int  a, b, r;
 
	if (cont) {
	  if (regr != 6) return 0xff;
	  r = 7;
	} else r = regr + 0x10;
 
	w2(0xc); w0(r); w2(4); w2(5); 
	         w0(0); a = r1();
	         w0(1); b = r1();
	w2(4);
 
	return j44(a,b);
 
}
 
static void fit2_read_block( PIA *pi, char * buf, int count )
 
{	int  k, a, b, c, d;
 
	w2(0xc); w0(0x10);
 
	for (k=0;k<count/4;k++) {
 
		w2(4); w2(5);
		w0(0); a = r1(); w0(1); b = r1();
		w0(3); c = r1(); w0(2); d = r1(); 
		buf[4*k+0] = j44(a,b);
		buf[4*k+1] = j44(d,c);
 
                w2(4); w2(5);
                       a = r1(); w0(3); b = r1();
                w0(1); c = r1(); w0(0); d = r1(); 
                buf[4*k+2] = j44(d,c);
                buf[4*k+3] = j44(a,b);
 
	}
 
	w2(4);
 
}
 
static void fit2_write_block( PIA *pi, char * buf, int count )
 
{	int k;
 
 
	w2(0xc); w0(0); 
	for (k=0;k<count/2;k++) {
		w2(4); w0(buf[2*k]); 
		w2(5); w0(buf[2*k+1]);
	}
	w2(4);
}
 
static void fit2_connect ( PIA *pi  )
 
{       pi->saved_r0 = r0();
        pi->saved_r2 = r2();
	w2(0xcc); 
}
 
static void fit2_disconnect ( PIA *pi )
 
{       w0(pi->saved_r0);
        w2(pi->saved_r2);
} 
 
static void fit2_log_adapter( PIA *pi, char * scratch, int verbose )
 
{       printk("%s: fit2 %s, FIT 2000 adapter at 0x%x, delay %d\n",
                pi->device,FIT2_VERSION,pi->port,pi->delay);
 
}
 
static void fit2_init_proto( PIA *pi)
 
{       MOD_INC_USE_COUNT;
}
 
static void fit2_release_proto( PIA *pi)
 
{       MOD_DEC_USE_COUNT;
}
 
struct pi_protocol fit2 = {"fit2",0,1,2,1,1,
                           fit2_write_regr,
                           fit2_read_regr,
                           fit2_write_block,
                           fit2_read_block,
                           fit2_connect,
                           fit2_disconnect,
                           0,
                           0,
                           0,
                           fit2_log_adapter,
                           fit2_init_proto,
                           fit2_release_proto
                          };
 
 
#ifdef MODULE
 
int     init_module(void)
 
{       return pi_register( &fit2 ) - 1;
}
 
void    cleanup_module(void)
 
{       pi_unregister( &fit2 );
}
 
#endif
 
/* end of fit2.c */