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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* (c) 1997-1998 Grant R. Guenther <grant@torque.net>
*
* 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.
*/
#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 "pata_parport.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(struct pi_adapter *pi, int cont, int regr, int val)
{
int 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(struct pi_adapter *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(struct pi_adapter *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(struct pi_adapter *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) \
do { \
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); \
} while (0)
static void epat_connect(struct pi_adapter *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(struct pi_adapter *pi)
{
CPP(0x30);
w0(pi->saved_r0);
w2(pi->saved_r2);
}
static int epat_test_proto(struct pi_adapter *pi)
{
int k, j, f, cc;
int e[2] = { 0, 0 };
char scratch[512];
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);
dev_dbg(&pi->dev,
"epat: port 0x%x, mode %d, ccr %x, test=(%d,%d,%d)\n",
pi->port, pi->mode, cc, e[0], e[1], f);
return (e[0] && e[1]) || f;
}
static void epat_log_adapter(struct pi_adapter *pi)
{
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);
dev_info(&pi->dev,
"Shuttle EPAT chip %x at 0x%x, mode %d (%s), delay %d\n",
ver, pi->port, 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_PATA_PARPORT_EPATC8
epatc8 = 1;
#endif
return pata_parport_register_driver(&epat);
}
static void __exit epat_exit(void)
{
pata_parport_unregister_driver(&epat);
}
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>");
MODULE_DESCRIPTION("Shuttle Technologies EPAT parallel port IDE adapter "
"protocol driver");
module_init(epat_init)
module_exit(epat_exit)
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