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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 */
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