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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* (c) 1997-8 Grant R. Guenther <grant@torque.net>
*
* aten.c is a low-level protocol driver for the ATEN EH-100
* parallel port adapter. The EH-100 supports 4-bit and 8-bit
* modes only. There is also an EH-132 which supports EPP mode
* transfers. The EH-132 is not yet supported.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/wait.h>
#include <linux/types.h>
#include <asm/io.h>
#include "pata_parport.h"
#define j44(a,b) ((((a>>4)&0x0f)|(b&0xf0))^0x88)
/*
* cont = 0 - access the IDE register file
* cont = 1 - access the IDE command set
*/
static int cont_map[2] = { 0x08, 0x20 };
static void aten_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
{
int r = regr + cont_map[cont] + 0x80;
w0(r); w2(0xe); w2(6); w0(val); w2(7); w2(6); w2(0xc);
}
static int aten_read_regr(struct pi_adapter *pi, int cont, int regr)
{
int a, b, r;
r = regr + cont_map[cont] + 0x40;
switch (pi->mode) {
case 0:
w0(r); w2(0xe); w2(6);
w2(7); w2(6); w2(0);
a = r1(); w0(0x10); b = r1(); w2(0xc);
return j44(a,b);
case 1:
r |= 0x10;
w0(r); w2(0xe); w2(6); w0(0xff);
w2(0x27); w2(0x26); w2(0x20);
a = r0();
w2(0x26); w2(0xc);
return a;
}
return -1;
}
static void aten_read_block(struct pi_adapter *pi, char *buf, int count)
{
int k, a, b, c, d;
switch (pi->mode) {
case 0:
w0(0x48); w2(0xe); w2(6);
for (k = 0; k < count / 2; k++) {
w2(7); w2(6); w2(2);
a = r1(); w0(0x58); b = r1();
w2(0); d = r1(); w0(0x48); c = r1();
buf[2 * k] = j44(c, d);
buf[2 * k + 1] = j44(a, b);
}
w2(0xc);
break;
case 1:
w0(0x58); w2(0xe); w2(6);
for (k = 0; k < count / 2; k++) {
w2(0x27); w2(0x26); w2(0x22);
a = r0(); w2(0x20); b = r0();
buf[2 * k] = b;
buf[2 * k + 1] = a;
}
w2(0x26); w2(0xc);
break;
}
}
static void aten_write_block(struct pi_adapter *pi, char *buf, int count)
{
int k;
w0(0x88); w2(0xe); w2(6);
for (k = 0; k < count / 2; k++) {
w0(buf[2 * k + 1]); w2(0xe); w2(6);
w0(buf[2 * k]); w2(7); w2(6);
}
w2(0xc);
}
static void aten_connect(struct pi_adapter *pi)
{
pi->saved_r0 = r0();
pi->saved_r2 = r2();
w2(0xc);
}
static void aten_disconnect(struct pi_adapter *pi)
{
w0(pi->saved_r0);
w2(pi->saved_r2);
}
static void aten_log_adapter(struct pi_adapter *pi)
{
char *mode_string[2] = { "4-bit", "8-bit" };
dev_info(&pi->dev,
"ATEN EH-100 at 0x%x, mode %d (%s), delay %d\n",
pi->port, pi->mode, mode_string[pi->mode], pi->delay);
}
static struct pi_protocol aten = {
.owner = THIS_MODULE,
.name = "aten",
.max_mode = 2,
.epp_first = 2,
.default_delay = 1,
.max_units = 1,
.write_regr = aten_write_regr,
.read_regr = aten_read_regr,
.write_block = aten_write_block,
.read_block = aten_read_block,
.connect = aten_connect,
.disconnect = aten_disconnect,
.log_adapter = aten_log_adapter,
};
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>");
MODULE_DESCRIPTION("ATEN EH-100 parallel port IDE adapter protocol driver");
module_pata_parport_driver(aten);
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