219 lines
4.8 KiB
C
219 lines
4.8 KiB
C
/*
|
|
comm.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
|
|
Under the terms of the GNU General 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/init.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/types.h>
|
|
#include <linux/wait.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); (void)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); (void)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); (void)r1(); w2(0x24);
|
|
for (i=0;i<count;i++) buf[i] = r4();
|
|
w2(4);
|
|
break;
|
|
|
|
case 3: w3(0x68); (void)r1(); w2(0x24);
|
|
for (i=0;i<count/2;i++) ((u16 *)buf)[i] = r4w();
|
|
w2(4);
|
|
break;
|
|
|
|
case 4: w3(0x68); (void)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); (void)r1();
|
|
for (k=0;k<count;k++) w4(buf[k^1]);
|
|
break;
|
|
|
|
case 3: w3(0x48); (void)r1();
|
|
for (k=0;k<count/2;k++) w4w(pi_swab16(buf,k));
|
|
break;
|
|
|
|
case 4: w3(0x48); (void)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 struct pi_protocol comm = {
|
|
.owner = THIS_MODULE,
|
|
.name = "comm",
|
|
.max_mode = 5,
|
|
.epp_first = 2,
|
|
.default_delay = 1,
|
|
.max_units = 1,
|
|
.write_regr = comm_write_regr,
|
|
.read_regr = comm_read_regr,
|
|
.write_block = comm_write_block,
|
|
.read_block = comm_read_block,
|
|
.connect = comm_connect,
|
|
.disconnect = comm_disconnect,
|
|
.log_adapter = comm_log_adapter,
|
|
};
|
|
|
|
static int __init comm_init(void)
|
|
{
|
|
return paride_register(&comm);
|
|
}
|
|
|
|
static void __exit comm_exit(void)
|
|
{
|
|
paride_unregister(&comm);
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|
|
module_init(comm_init)
|
|
module_exit(comm_exit)
|