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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* (c) 1998 Grant R. Guenther <grant@torque.net>
*
* fit3.c is a low-level protocol driver for newer models
* of the Fidelity International Technology parallel port adapter.
* This adapter is used in their TransDisk 3000 portable
* hard-drives, as well as CD-ROM, PD-CD and other devices.
*
* The TD-2000 and certain older devices use a different protocol.
* Try the fit2 protocol module with them.
*
* NB: The FIT adapters do not appear to support the control
* registers. So, we map ALT_STATUS to STATUS and NO-OP writes
* to the device control register - this means that IDE reset
* will not work on these devices.
*/
#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 >> 3) & 0x0f) | ((b << 1) & 0xf0))
#define w7(byte) out_p(7, byte)
#define r7() (in_p(7) & 0xff)
/*
* cont = 0 - access the IDE register file
* cont = 1 - access the IDE command set
*/
static void fit3_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
{
if (cont == 1)
return;
switch (pi->mode) {
case 0:
case 1:
w2(0xc); w0(regr); w2(0x8); w2(0xc);
w0(val); w2(0xd);
w0(0); w2(0xc);
break;
case 2:
w2(0xc); w0(regr); w2(0x8); w2(0xc);
w4(val); w4(0);
w2(0xc);
break;
}
}
static int fit3_read_regr(struct pi_adapter *pi, int cont, int regr)
{
int a, b;
if (cont) {
if (regr != 6)
return 0xff;
regr = 7;
}
switch (pi->mode) {
case 0:
w2(0xc); w0(regr + 0x10); w2(0x8); w2(0xc);
w2(0xd); a = r1();
w2(0xf); b = r1();
w2(0xc);
return j44(a, b);
case 1:
w2(0xc); w0(regr + 0x90); w2(0x8); w2(0xc);
w2(0xec); w2(0xee); w2(0xef); a = r0();
w2(0xc);
return a;
case 2:
w2(0xc); w0(regr + 0x90); w2(0x8); w2(0xc);
w2(0xec);
a = r4(); b = r4();
w2(0xc);
return a;
}
return -1;
}
static void fit3_read_block(struct pi_adapter *pi, char *buf, int count)
{
int k, a, b, c, d;
switch (pi->mode) {
case 0:
w2(0xc); w0(0x10); w2(0x8); w2(0xc);
for (k = 0; k < count / 2; k++) {
w2(0xd); a = r1();
w2(0xf); b = r1();
w2(0xc); c = r1();
w2(0xe); d = r1();
buf[2 * k] = j44(a, b);
buf[2 * k + 1] = j44(c, d);
}
w2(0xc);
break;
case 1:
w2(0xc); w0(0x90); w2(0x8); w2(0xc);
w2(0xec); w2(0xee);
for (k = 0; k < count / 2; k++) {
w2(0xef); a = r0();
w2(0xee); b = r0();
buf[2 * k] = a;
buf[2 * k + 1] = b;
}
w2(0xec);
w2(0xc);
break;
case 2:
w2(0xc); w0(0x90); w2(0x8); w2(0xc);
w2(0xec);
for (k = 0; k < count; k++)
buf[k] = r4();
w2(0xc);
break;
}
}
static void fit3_write_block(struct pi_adapter *pi, char *buf, int count)
{
int k;
switch (pi->mode) {
case 0:
case 1:
w2(0xc); w0(0); w2(0x8); w2(0xc);
for (k = 0; k < count / 2; k++) {
w0(buf[2 * k]); w2(0xd);
w0(buf[2 * k + 1]); w2(0xc);
}
break;
case 2:
w2(0xc); w0(0); w2(0x8); w2(0xc);
for (k = 0; k < count; k++)
w4(buf[k]);
w2(0xc);
break;
}
}
static void fit3_connect(struct pi_adapter *pi)
{
pi->saved_r0 = r0();
pi->saved_r2 = r2();
w2(0xc); w0(0); w2(0xa);
if (pi->mode == 2) {
w2(0xc); w0(0x9);
w2(0x8); w2(0xc);
}
}
static void fit3_disconnect(struct pi_adapter *pi)
{
w2(0xc); w0(0xa); w2(0x8); w2(0xc);
w0(pi->saved_r0);
w2(pi->saved_r2);
}
static void fit3_log_adapter(struct pi_adapter *pi)
{
char *mode_string[3] = { "4-bit", "8-bit", "EPP"};
dev_info(&pi->dev,
"FIT 3000 adapter at 0x%x, mode %d (%s), delay %d\n",
pi->port, pi->mode, mode_string[pi->mode], pi->delay);
}
static struct pi_protocol fit3 = {
.owner = THIS_MODULE,
.name = "fit3",
.max_mode = 3,
.epp_first = 2,
.default_delay = 1,
.max_units = 1,
.write_regr = fit3_write_regr,
.read_regr = fit3_read_regr,
.write_block = fit3_write_block,
.read_block = fit3_read_block,
.connect = fit3_connect,
.disconnect = fit3_disconnect,
.log_adapter = fit3_log_adapter,
};
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>");
MODULE_DESCRIPTION("Fidelity International Technology parallel port IDE adapter"
"(newer models) protocol driver");
module_pata_parport_driver(fit3);
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