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/* 
        fit3.c        (c) 1998  Grant R. Guenther <grant@torque.net>
                          Under the terms of the GNU General Public License.
 
	fit3.c is a low-level protocol driver for newer models 
        of the Fidelity International Technology parallel port adapter.  
	This adapter is used in their TransDisk 3000 portable 
	hard-drives, as well as CD-ROM, PD-CD and other devices.
 
	The TD-2000 and certain older devices use a different protocol.
	Try the fit2 protocol module with them.
 
        NB:  The FIT adapters do not appear to support 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.
 
*/
 
#define FIT3_VERSION      "1.0"
 
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/wait.h>
#include <asm/io.h>
 
#include "paride.h"
 
#define j44(a,b)                (((a>>3)&0x0f)|((b<<1)&0xf0))
 
#define w7(byte)                {out_p(7,byte);}
#define r7()                    (in_p(7) & 0xff)
 
/* cont = 0 - access the IDE register file 
   cont = 1 - access the IDE command set 
 
*/
 
static void  fit3_write_regr( PIA *pi, int cont, int regr, int val)
 
{	if (cont == 1) return;
 
	switch (pi->mode) {
 
	case 0:
	case 1: w2(0xc); w0(regr); w2(0x8); w2(0xc); 
		w0(val); w2(0xd); 
		w0(0);   w2(0xc);
		break;
 
	case 2: w2(0xc); w0(regr); w2(0x8); w2(0xc);
		w4(val); w4(0);
		w2(0xc);
		break;
 
	}
}
 
static int fit3_read_regr( PIA *pi, int cont, int regr )
 
{	int  a, b;
 
	if (cont) {
	  if (regr != 6) return 0xff;
	  regr = 7;
	} 
 
	switch (pi->mode) {
 
	case 0: w2(0xc); w0(regr + 0x10); w2(0x8); w2(0xc);
		w2(0xd); a = r1();
		w2(0xf); b = r1(); 
		w2(0xc);
		return j44(a,b);
 
	case 1: w2(0xc); w0(regr + 0x90); w2(0x8); w2(0xc);
		w2(0xec); w2(0xee); w2(0xef); a = r0(); 
		w2(0xc);
		return a;
 
	case 2: w2(0xc); w0(regr + 0x90); w2(0x8); w2(0xc); 
		w2(0xec); 
		a = r4(); b = r4(); 
		w2(0xc);
		return a;
 
	}
	return -1; 
 
}
 
static void fit3_read_block( PIA *pi, char * buf, int count )
 
{	int  k, a, b, c, d;
 
	switch (pi->mode) {
 
	case 0: w2(0xc); w0(0x10); w2(0x8); w2(0xc);
		for (k=0;k<count/2;k++) {
		    w2(0xd); a = r1();
		    w2(0xf); b = r1();
		    w2(0xc); c = r1();
		    w2(0xe); d = r1();
		    buf[2*k  ] = j44(a,b);
		    buf[2*k+1] = j44(c,d);
		}
		w2(0xc);
		break;
 
	case 1: w2(0xc); w0(0x90); w2(0x8); w2(0xc); 
		w2(0xec); w2(0xee);
		for (k=0;k<count/2;k++) {
		    w2(0xef); a = r0();
		    w2(0xee); b = r0();
                    buf[2*k  ] = a;
                    buf[2*k+1] = b;
		}
		w2(0xec); 
		w2(0xc);
		break;
 
	case 2: w2(0xc); w0(0x90); w2(0x8); w2(0xc); 
                w2(0xec);
		for (k=0;k<count;k++) buf[k] = r4();
                w2(0xc);
		break;
 
	}
}
 
static void fit3_write_block( PIA *pi, char * buf, int count )
 
{	int k;
 
        switch (pi->mode) {
 
	case 0:
        case 1: w2(0xc); w0(0); w2(0x8); w2(0xc);
                for (k=0;k<count/2;k++) {
 		    w0(buf[2*k  ]); w2(0xd);
 		    w0(buf[2*k+1]); w2(0xc);
		}
		break;
 
        case 2: w2(0xc); w0(0); w2(0x8); w2(0xc); 
                for (k=0;k<count;k++) w4(buf[k]);
                w2(0xc);
		break;
	}
}
 
static void fit3_connect ( PIA *pi  )
 
{       pi->saved_r0 = r0();
        pi->saved_r2 = r2();
	w2(0xc); w0(0); w2(0xa);
	if (pi->mode == 2) { 
		w2(0xc); w0(0x9); w2(0x8); w2(0xc); 
		}
}
 
static void fit3_disconnect ( PIA *pi )
 
{       w2(0xc); w0(0xa); w2(0x8); w2(0xc);
	w0(pi->saved_r0);
        w2(pi->saved_r2);
} 
 
static void fit3_log_adapter( PIA *pi, char * scratch, int verbose )
 
{       char    *mode_string[3] = {"4-bit","8-bit","EPP"};
 
	printk("%s: fit3 %s, FIT 3000 adapter at 0x%x, "
	       "mode %d (%s), delay %d\n",
                pi->device,FIT3_VERSION,pi->port,
		pi->mode,mode_string[pi->mode],pi->delay);
 
}
 
static void fit3_init_proto(PIA *pi)
 
{       MOD_INC_USE_COUNT;
}
 
static void fit3_release_proto(PIA *pi)
 
{       MOD_DEC_USE_COUNT;
}
 
struct pi_protocol fit3 = {"fit3",0,3,2,1,1,
                           fit3_write_regr,
                           fit3_read_regr,
                           fit3_write_block,
                           fit3_read_block,
                           fit3_connect,
                           fit3_disconnect,
                           0,
                           0,
                           0,
                           fit3_log_adapter,
                           fit3_init_proto,
                           fit3_release_proto
                          };
 
 
#ifdef MODULE
 
int     init_module(void)
 
{       return pi_register( &fit3 ) - 1;
}
 
void    cleanup_module(void)
 
{       pi_unregister( &fit3 );
}
 
#endif
 
/* end of fit3.c */
MODULE_LICENSE("GPL");