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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* (c) 1997-1998 Grant R. Guenther <grant@torque.net>
*
* epia.c is a low-level protocol driver for Shuttle Technologies
* EPIA parallel to IDE adapter chip. This device is now obsolete
* and has been replaced with the EPAT chip, which is supported
* by epat.c, however, some devices based on EPIA are still
* available.
*/
#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"
/*
* mode codes: 0 nybble reads on port 1, 8-bit writes
* 1 5/3 reads on ports 1 & 2, 8-bit writes
* 2 8-bit reads and writes
* 3 8-bit EPP mode
* 4 16-bit EPP
* 5 32-bit EPP
*/
#define j44(a, b) (((a >> 4) & 0x0f) + (b & 0xf0))
#define j53(a, b) (((a >> 3) & 0x1f) + ((b << 4) & 0xe0))
/*
* cont = 0 IDE register file
* cont = 1 IDE control registers
*/
static int cont_map[2] = { 0, 0x80 };
static int epia_read_regr(struct pi_adapter *pi, int cont, int regr)
{
int a, b, r;
regr += cont_map[cont];
switch (pi->mode) {
case 0:
r = regr ^ 0x39;
w0(r); w2(1); w2(3); w0(r);
a = r1(); w2(1); b = r1(); w2(4);
return j44(a, b);
case 1:
r = regr ^ 0x31;
w0(r); w2(1); w0(r & 0x37);
w2(3); w2(5); w0(r | 0xf0);
a = r1(); b = r2(); w2(4);
return j53(a, b);
case 2:
r = regr^0x29;
w0(r); w2(1); w2(0X21); w2(0x23);
a = r0(); w2(4);
return a;
case 3:
case 4:
case 5:
w3(regr); w2(0x24); a = r4(); w2(4);
return a;
}
return -1;
}
static void epia_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:
r = regr ^ 0x19;
w0(r); w2(1); w0(val); w2(3); w2(4);
break;
case 3:
case 4:
case 5:
r = regr ^ 0x40;
w3(r); w4(val); w2(4);
break;
}
}
#define WR(r, v) epia_write_regr(pi, 0, r, v)
#define RR(r) epia_read_regr(pi, 0, r)
/*
* The use of register 0x84 is entirely unclear - it seems to control
* some EPP counters ... currently we know about 3 different block
* sizes: the standard 512 byte reads and writes, 12 byte writes and
* 2048 byte reads (the last two being used in the CDrom drivers.
*/
static void epia_connect(struct pi_adapter *pi)
{
pi->saved_r0 = r0();
pi->saved_r2 = r2();
w2(4); w0(0xa0); w0(0x50); w0(0xc0); w0(0x30); w0(0xa0); w0(0);
w2(1); w2(4);
if (pi->mode >= 3) {
w0(0xa); w2(1); w2(4); w0(0x82); w2(4); w2(0xc); w2(4);
w2(0x24); w2(0x26); w2(4);
}
WR(0x86, 8);
}
static void epia_disconnect(struct pi_adapter *pi)
{
/* WR(0x84,0x10); */
w0(pi->saved_r0);
w2(1); w2(4);
w0(pi->saved_r0);
w2(pi->saved_r2);
}
static void epia_read_block(struct pi_adapter *pi, char *buf, int count)
{
int k, ph, a, b;
switch (pi->mode) {
case 0:
w0(0x81); w2(1); w2(3); w0(0xc1);
ph = 1;
for (k = 0; k < count; k++) {
w2(2+ph); a = r1();
w2(4+ph); b = r1();
buf[k] = j44(a, b);
ph = 1 - ph;
}
w0(0); w2(4);
break;
case 1:
w0(0x91); w2(1); w0(0x10); w2(3);
w0(0x51); w2(5); w0(0xd1);
ph = 1;
for (k = 0; k < count; k++) {
w2(4 + ph);
a = r1(); b = r2();
buf[k] = j53(a, b);
ph = 1 - ph;
}
w0(0); w2(4);
break;
case 2:
w0(0x89); w2(1); w2(0x23); w2(0x21);
ph = 1;
for (k = 0; k < count; k++) {
w2(0x24 + ph);
buf[k] = r0();
ph = 1 - ph;
}
w2(6); w2(4);
break;
case 3:
if (count > 512)
WR(0x84, 3);
w3(0); w2(0x24);
for (k = 0; k < count; k++)
buf[k] = r4();
w2(4); WR(0x84, 0);
break;
case 4:
if (count > 512)
WR(0x84, 3);
w3(0); w2(0x24);
for (k = 0; k < count / 2; k++)
((u16 *)buf)[k] = r4w();
w2(4); WR(0x84, 0);
break;
case 5:
if (count > 512)
WR(0x84, 3);
w3(0); w2(0x24);
for (k = 0; k < count / 4; k++)
((u32 *)buf)[k] = r4l();
w2(4); WR(0x84, 0);
break;
}
}
static void epia_write_block(struct pi_adapter *pi, char *buf, int count)
{
int ph, k, last, d;
switch (pi->mode) {
case 0:
case 1:
case 2:
w0(0xa1); w2(1); w2(3); w2(1); w2(5);
ph = 0; last = 0x8000;
for (k = 0; k < count; k++) {
d = buf[k];
if (d != last) {
last = d;
w0(d);
}
w2(4 + ph);
ph = 1 - ph;
}
w2(7); w2(4);
break;
case 3:
if (count < 512)
WR(0x84, 1);
w3(0x40);
for (k = 0; k < count; k++)
w4(buf[k]);
if (count < 512)
WR(0x84, 0);
break;
case 4:
if (count < 512)
WR(0x84, 1);
w3(0x40);
for (k = 0; k < count / 2; k++)
w4w(((u16 *)buf)[k]);
if (count < 512)
WR(0x84, 0);
break;
case 5:
if (count < 512)
WR(0x84, 1);
w3(0x40);
for (k = 0; k < count / 4; k++)
w4l(((u32 *)buf)[k]);
if (count < 512)
WR(0x84, 0);
break;
}
}
static int epia_test_proto(struct pi_adapter *pi)
{
int j, k, f;
int e[2] = { 0, 0 };
char scratch[512];
epia_connect(pi);
for (j = 0; j < 2; j++) {
WR(6, 0xa0 + j * 0x10);
for (k = 0; k < 256; k++) {
WR(2, k ^ 0xaa);
WR(3, k ^ 0x55);
if (RR(2) != (k ^ 0xaa))
e[j]++;
}
WR(2, 1); WR(3, 1);
}
epia_disconnect(pi);
f = 0;
epia_connect(pi);
WR(0x84, 8);
epia_read_block(pi, scratch, 512);
for (k = 0; k < 256; k++) {
if ((scratch[2 * k] & 0xff) != ((k + 1) & 0xff))
f++;
if ((scratch[2 * k + 1] & 0xff) != ((-2 - k) & 0xff))
f++;
}
WR(0x84, 0);
epia_disconnect(pi);
dev_dbg(&pi->dev, "epia: port 0x%x, mode %d, test=(%d,%d,%d)\n",
pi->port, pi->mode, e[0], e[1], f);
return (e[0] && e[1]) || f;
}
static void epia_log_adapter(struct pi_adapter *pi)
{
char *mode[6] = { "4-bit", "5/3", "8-bit", "EPP-8", "EPP-16", "EPP-32"};
dev_info(&pi->dev,
"Shuttle EPIA at 0x%x, mode %d (%s), delay %d\n",
pi->port, pi->mode, mode[pi->mode], pi->delay);
}
static struct pi_protocol epia = {
.owner = THIS_MODULE,
.name = "epia",
.max_mode = 6,
.epp_first = 3,
.default_delay = 1,
.max_units = 1,
.write_regr = epia_write_regr,
.read_regr = epia_read_regr,
.write_block = epia_write_block,
.read_block = epia_read_block,
.connect = epia_connect,
.disconnect = epia_disconnect,
.test_proto = epia_test_proto,
.log_adapter = epia_log_adapter,
};
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>");
MODULE_DESCRIPTION("Shuttle Technologies EPIA parallel port IDE adapter "
"protocol driver");
module_pata_parport_driver(epia);
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