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/*
dstr.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
Under the terms of the GNU General Public License.
dstr.c is a low-level protocol driver for the
DataStor EP2000 parallel to IDE adapter chip.
*/
/* Changes:
1.01 GRG 1998.05.06 init_proto, release_proto
*/
#define DSTR_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
3 EPP-16
4 EPP-32
*/
#define j44(a,b) (((a>>3)&0x07)|((~a>>4)&0x08)|((b<<1)&0x70)|((~b)&0x80))
#define P1 w2(5);w2(0xd);w2(5);w2(4);
#define P2 w2(5);w2(7);w2(5);w2(4);
#define P3 w2(6);w2(4);w2(6);w2(4);
/* cont = 0 - access the IDE register file
cont = 1 - access the IDE command set
*/
static int cont_map[2] = { 0x20, 0x40 };
static int dstr_read_regr( PIA *pi, int cont, int regr )
{ int a, b, r;
r = regr + cont_map[cont];
w0(0x81); P1;
if (pi->mode) { w0(0x11); } else { w0(1); }
P2; w0(r); P1;
switch (pi->mode) {
case 0: w2(6); a = r1(); w2(4); w2(6); b = r1(); w2(4);
return j44(a,b);
case 1: w0(0); w2(0x26); a = r0(); w2(4);
return a;
case 2:
case 3:
case 4: w2(0x24); a = r4(); w2(4);
return a;
}
return -1;
}
static void dstr_write_regr( PIA *pi, int cont, int regr, int val )
{ int r;
r = regr + cont_map[cont];
w0(0x81); P1;
if (pi->mode >= 2) { w0(0x11); } else { w0(1); }
P2; w0(r); P1;
switch (pi->mode) {
case 0:
case 1: w0(val); w2(5); w2(7); w2(5); w2(4);
break;
case 2:
case 3:
case 4: w4(val);
break;
}
}
#define CCP(x) w0(0xff);w2(0xc);w2(4);\
w0(0xaa);w0(0x55);w0(0);w0(0xff);w0(0x87);w0(0x78);\
w0(x);w2(5);w2(4);
static void dstr_connect ( PIA *pi )
{ pi->saved_r0 = r0();
pi->saved_r2 = r2();
w2(4); CCP(0xe0); w0(0xff);
}
static void dstr_disconnect ( PIA *pi )
{ CCP(0x30);
w0(pi->saved_r0);
w2(pi->saved_r2);
}
static void dstr_read_block( PIA *pi, char * buf, int count )
{ int k, a, b;
w0(0x81); P1;
if (pi->mode) { w0(0x19); } else { w0(9); }
P2; w0(0x82); P1; P3; w0(0x20); P1;
switch (pi->mode) {
case 0: for (k=0;k<count;k++) {
w2(6); a = r1(); w2(4);
w2(6); b = r1(); w2(4);
buf[k] = j44(a,b);
}
break;
case 1: w0(0);
for (k=0;k<count;k++) {
w2(0x26); buf[k] = r0(); w2(0x24);
}
w2(4);
break;
case 2: w2(0x24);
for (k=0;k<count;k++) buf[k] = r4();
w2(4);
break;
case 3: w2(0x24);
for (k=0;k<count/2;k++) ((u16 *)buf)[k] = r4w();
w2(4);
break;
case 4: w2(0x24);
for (k=0;k<count/4;k++) ((u32 *)buf)[k] = r4l();
w2(4);
break;
}
}
static void dstr_write_block( PIA *pi, char * buf, int count )
{ int k;
w0(0x81); P1;
if (pi->mode) { w0(0x19); } else { w0(9); }
P2; w0(0x82); P1; P3; w0(0x20); P1;
switch (pi->mode) {
case 0:
case 1: for (k=0;k<count;k++) {
w2(5); w0(buf[k]); w2(7);
}
w2(5); w2(4);
break;
case 2: w2(0xc5);
for (k=0;k<count;k++) w4(buf[k]);
w2(0xc4);
break;
case 3: w2(0xc5);
for (k=0;k<count/2;k++) w4w(((u16 *)buf)[k]);
w2(0xc4);
break;
case 4: w2(0xc5);
for (k=0;k<count/4;k++) w4l(((u32 *)buf)[k]);
w2(0xc4);
break;
}
}
static void dstr_log_adapter( PIA *pi, char * scratch, int verbose )
{ char *mode_string[5] = {"4-bit","8-bit","EPP-8",
"EPP-16","EPP-32"};
printk("%s: dstr %s, DataStor EP2000 at 0x%x, ",
pi->device,DSTR_VERSION,pi->port);
printk("mode %d (%s), delay %d\n",pi->mode,
mode_string[pi->mode],pi->delay);
}
static struct pi_protocol dstr = {
.owner = THIS_MODULE,
.name = "dstr",
.max_mode = 5,
.epp_first = 2,
.default_delay = 1,
.max_units = 1,
.write_regr = dstr_write_regr,
.read_regr = dstr_read_regr,
.write_block = dstr_write_block,
.read_block = dstr_read_block,
.connect = dstr_connect,
.disconnect = dstr_disconnect,
.log_adapter = dstr_log_adapter,
};
static int __init dstr_init(void)
{
return paride_register(&dstr);
}
static void __exit dstr_exit(void)
{
paride_unregister(&dstr);
}
MODULE_LICENSE("GPL");
module_init(dstr_init)
module_exit(dstr_exit)
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