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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 */