341 lines
7.0 KiB
C
341 lines
7.0 KiB
C
/*
|
|
epat.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
|
|
Under the terms of the GNU General Public License.
|
|
|
|
This is the low level protocol driver for the EPAT parallel
|
|
to IDE adapter from Shuttle Technologies. This adapter is
|
|
used in many popular parallel port disk products such as the
|
|
SyQuest EZ drives, the Avatar Shark and the Imation SuperDisk.
|
|
|
|
*/
|
|
|
|
/* Changes:
|
|
|
|
1.01 GRG 1998.05.06 init_proto, release_proto
|
|
1.02 Joshua b. Jore CPP(renamed), epat_connect, epat_disconnect
|
|
|
|
*/
|
|
|
|
#define EPAT_VERSION "1.02"
|
|
|
|
#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"
|
|
|
|
#define j44(a,b) (((a>>4)&0x0f)+(b&0xf0))
|
|
#define j53(a,b) (((a>>3)&0x1f)+((b<<4)&0xe0))
|
|
|
|
static int epatc8;
|
|
|
|
module_param(epatc8, int, 0);
|
|
MODULE_PARM_DESC(epatc8, "support for the Shuttle EP1284 chip, "
|
|
"used in any recent Imation SuperDisk (LS-120) drive.");
|
|
|
|
/* cont = 0 IDE register file
|
|
cont = 1 IDE control registers
|
|
cont = 2 internal EPAT registers
|
|
*/
|
|
|
|
static int cont_map[3] = { 0x18, 0x10, 0 };
|
|
|
|
static void epat_write_regr( PIA *pi, int cont, int regr, int val)
|
|
|
|
{ int r;
|
|
|
|
r = regr + cont_map[cont];
|
|
|
|
switch (pi->mode) {
|
|
|
|
case 0:
|
|
case 1:
|
|
case 2: w0(0x60+r); w2(1); w0(val); w2(4);
|
|
break;
|
|
|
|
case 3:
|
|
case 4:
|
|
case 5: w3(0x40+r); w4(val);
|
|
break;
|
|
|
|
}
|
|
}
|
|
|
|
static int epat_read_regr( PIA *pi, int cont, int regr )
|
|
|
|
{ int a, b, r;
|
|
|
|
r = regr + cont_map[cont];
|
|
|
|
switch (pi->mode) {
|
|
|
|
case 0: w0(r); w2(1); w2(3);
|
|
a = r1(); w2(4); b = r1();
|
|
return j44(a,b);
|
|
|
|
case 1: w0(0x40+r); w2(1); w2(4);
|
|
a = r1(); b = r2(); w0(0xff);
|
|
return j53(a,b);
|
|
|
|
case 2: w0(0x20+r); w2(1); w2(0x25);
|
|
a = r0(); w2(4);
|
|
return a;
|
|
|
|
case 3:
|
|
case 4:
|
|
case 5: w3(r); w2(0x24); a = r4(); w2(4);
|
|
return a;
|
|
|
|
}
|
|
return -1; /* never gets here */
|
|
}
|
|
|
|
static void epat_read_block( PIA *pi, char * buf, int count )
|
|
|
|
{ int k, ph, a, b;
|
|
|
|
switch (pi->mode) {
|
|
|
|
case 0: w0(7); w2(1); w2(3); w0(0xff);
|
|
ph = 0;
|
|
for(k=0;k<count;k++) {
|
|
if (k == count-1) w0(0xfd);
|
|
w2(6+ph); a = r1();
|
|
if (a & 8) b = a;
|
|
else { w2(4+ph); b = r1(); }
|
|
buf[k] = j44(a,b);
|
|
ph = 1 - ph;
|
|
}
|
|
w0(0); w2(4);
|
|
break;
|
|
|
|
case 1: w0(0x47); w2(1); w2(5); w0(0xff);
|
|
ph = 0;
|
|
for(k=0;k<count;k++) {
|
|
if (k == count-1) w0(0xfd);
|
|
w2(4+ph);
|
|
a = r1(); b = r2();
|
|
buf[k] = j53(a,b);
|
|
ph = 1 - ph;
|
|
}
|
|
w0(0); w2(4);
|
|
break;
|
|
|
|
case 2: w0(0x27); w2(1); w2(0x25); w0(0);
|
|
ph = 0;
|
|
for(k=0;k<count-1;k++) {
|
|
w2(0x24+ph);
|
|
buf[k] = r0();
|
|
ph = 1 - ph;
|
|
}
|
|
w2(0x26); w2(0x27); buf[count-1] = r0();
|
|
w2(0x25); w2(4);
|
|
break;
|
|
|
|
case 3: w3(0x80); w2(0x24);
|
|
for(k=0;k<count-1;k++) buf[k] = r4();
|
|
w2(4); w3(0xa0); w2(0x24); buf[count-1] = r4();
|
|
w2(4);
|
|
break;
|
|
|
|
case 4: w3(0x80); w2(0x24);
|
|
for(k=0;k<(count/2)-1;k++) ((u16 *)buf)[k] = r4w();
|
|
buf[count-2] = r4();
|
|
w2(4); w3(0xa0); w2(0x24); buf[count-1] = r4();
|
|
w2(4);
|
|
break;
|
|
|
|
case 5: w3(0x80); w2(0x24);
|
|
for(k=0;k<(count/4)-1;k++) ((u32 *)buf)[k] = r4l();
|
|
for(k=count-4;k<count-1;k++) buf[k] = r4();
|
|
w2(4); w3(0xa0); w2(0x24); buf[count-1] = r4();
|
|
w2(4);
|
|
break;
|
|
|
|
}
|
|
}
|
|
|
|
static void epat_write_block( PIA *pi, char * buf, int count )
|
|
|
|
{ int ph, k;
|
|
|
|
switch (pi->mode) {
|
|
|
|
case 0:
|
|
case 1:
|
|
case 2: w0(0x67); w2(1); w2(5);
|
|
ph = 0;
|
|
for(k=0;k<count;k++) {
|
|
w0(buf[k]);
|
|
w2(4+ph);
|
|
ph = 1 - ph;
|
|
}
|
|
w2(7); w2(4);
|
|
break;
|
|
|
|
case 3: w3(0xc0);
|
|
for(k=0;k<count;k++) w4(buf[k]);
|
|
w2(4);
|
|
break;
|
|
|
|
case 4: w3(0xc0);
|
|
for(k=0;k<(count/2);k++) w4w(((u16 *)buf)[k]);
|
|
w2(4);
|
|
break;
|
|
|
|
case 5: w3(0xc0);
|
|
for(k=0;k<(count/4);k++) w4l(((u32 *)buf)[k]);
|
|
w2(4);
|
|
break;
|
|
|
|
}
|
|
}
|
|
|
|
/* these macros access the EPAT registers in native addressing */
|
|
|
|
#define WR(r,v) epat_write_regr(pi,2,r,v)
|
|
#define RR(r) (epat_read_regr(pi,2,r))
|
|
|
|
/* and these access the IDE task file */
|
|
|
|
#define WRi(r,v) epat_write_regr(pi,0,r,v)
|
|
#define RRi(r) (epat_read_regr(pi,0,r))
|
|
|
|
/* FIXME: the CPP stuff should be fixed to handle multiple EPATs on a chain */
|
|
|
|
#define CPP(x) w2(4);w0(0x22);w0(0xaa);w0(0x55);w0(0);w0(0xff);\
|
|
w0(0x87);w0(0x78);w0(x);w2(4);w2(5);w2(4);w0(0xff);
|
|
|
|
static void epat_connect ( PIA *pi )
|
|
|
|
{ pi->saved_r0 = r0();
|
|
pi->saved_r2 = r2();
|
|
|
|
/* Initialize the chip */
|
|
CPP(0);
|
|
|
|
if (epatc8) {
|
|
CPP(0x40);CPP(0xe0);
|
|
w0(0);w2(1);w2(4);
|
|
WR(0x8,0x12);WR(0xc,0x14);WR(0x12,0x10);
|
|
WR(0xe,0xf);WR(0xf,4);
|
|
/* WR(0xe,0xa);WR(0xf,4); */
|
|
WR(0xe,0xd);WR(0xf,0);
|
|
/* CPP(0x30); */
|
|
}
|
|
|
|
/* Connect to the chip */
|
|
CPP(0xe0);
|
|
w0(0);w2(1);w2(4); /* Idle into SPP */
|
|
if (pi->mode >= 3) {
|
|
w0(0);w2(1);w2(4);w2(0xc);
|
|
/* Request EPP */
|
|
w0(0x40);w2(6);w2(7);w2(4);w2(0xc);w2(4);
|
|
}
|
|
|
|
if (!epatc8) {
|
|
WR(8,0x10); WR(0xc,0x14); WR(0xa,0x38); WR(0x12,0x10);
|
|
}
|
|
}
|
|
|
|
static void epat_disconnect (PIA *pi)
|
|
{ CPP(0x30);
|
|
w0(pi->saved_r0);
|
|
w2(pi->saved_r2);
|
|
}
|
|
|
|
static int epat_test_proto( PIA *pi, char * scratch, int verbose )
|
|
|
|
{ int k, j, f, cc;
|
|
int e[2] = {0,0};
|
|
|
|
epat_connect(pi);
|
|
cc = RR(0xd);
|
|
epat_disconnect(pi);
|
|
|
|
epat_connect(pi);
|
|
for (j=0;j<2;j++) {
|
|
WRi(6,0xa0+j*0x10);
|
|
for (k=0;k<256;k++) {
|
|
WRi(2,k^0xaa);
|
|
WRi(3,k^0x55);
|
|
if (RRi(2) != (k^0xaa)) e[j]++;
|
|
}
|
|
}
|
|
epat_disconnect(pi);
|
|
|
|
f = 0;
|
|
epat_connect(pi);
|
|
WR(0x13,1); WR(0x13,0); WR(0xa,0x11);
|
|
epat_read_block(pi,scratch,512);
|
|
|
|
for (k=0;k<256;k++) {
|
|
if ((scratch[2*k] & 0xff) != k) f++;
|
|
if ((scratch[2*k+1] & 0xff) != (0xff-k)) f++;
|
|
}
|
|
epat_disconnect(pi);
|
|
|
|
if (verbose) {
|
|
printk("%s: epat: port 0x%x, mode %d, ccr %x, test=(%d,%d,%d)\n",
|
|
pi->device,pi->port,pi->mode,cc,e[0],e[1],f);
|
|
}
|
|
|
|
return (e[0] && e[1]) || f;
|
|
}
|
|
|
|
static void epat_log_adapter( PIA *pi, char * scratch, int verbose )
|
|
|
|
{ int ver;
|
|
char *mode_string[6] =
|
|
{"4-bit","5/3","8-bit","EPP-8","EPP-16","EPP-32"};
|
|
|
|
epat_connect(pi);
|
|
WR(0xa,0x38); /* read the version code */
|
|
ver = RR(0xb);
|
|
epat_disconnect(pi);
|
|
|
|
printk("%s: epat %s, Shuttle EPAT chip %x at 0x%x, ",
|
|
pi->device,EPAT_VERSION,ver,pi->port);
|
|
printk("mode %d (%s), delay %d\n",pi->mode,
|
|
mode_string[pi->mode],pi->delay);
|
|
|
|
}
|
|
|
|
static struct pi_protocol epat = {
|
|
.owner = THIS_MODULE,
|
|
.name = "epat",
|
|
.max_mode = 6,
|
|
.epp_first = 3,
|
|
.default_delay = 1,
|
|
.max_units = 1,
|
|
.write_regr = epat_write_regr,
|
|
.read_regr = epat_read_regr,
|
|
.write_block = epat_write_block,
|
|
.read_block = epat_read_block,
|
|
.connect = epat_connect,
|
|
.disconnect = epat_disconnect,
|
|
.test_proto = epat_test_proto,
|
|
.log_adapter = epat_log_adapter,
|
|
};
|
|
|
|
static int __init epat_init(void)
|
|
{
|
|
#ifdef CONFIG_PARIDE_EPATC8
|
|
epatc8 = 1;
|
|
#endif
|
|
return paride_register(&epat);
|
|
}
|
|
|
|
static void __exit epat_exit(void)
|
|
{
|
|
paride_unregister(&epat);
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|
|
module_init(epat_init)
|
|
module_exit(epat_exit)
|