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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* (c) 1998 Grant R. Guenther <grant@torque.net>
*
* ktti.c is a low-level protocol driver for the KT Technology
* parallel port adapter. This adapter is used in the "PHd"
* portable hard-drives. As far as I can tell, this device
* supports 4-bit mode _only_.
*/
#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))
/*
* cont = 0 - access the IDE register file
* cont = 1 - access the IDE command set
*/
static int cont_map[2] = { 0x10, 0x08 };
static void ktti_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
{
int r = regr + cont_map[cont];
w0(r); w2(0xb); w2(0xa); w2(3); w2(6);
w0(val); w2(3); w0(0); w2(6); w2(0xb);
}
static int ktti_read_regr(struct pi_adapter *pi, int cont, int regr)
{
int a, b, r;
r = regr + cont_map[cont];
w0(r); w2(0xb); w2(0xa); w2(9); w2(0xc); w2(9);
a = r1(); w2(0xc); b = r1(); w2(9); w2(0xc); w2(9);
return j44(a, b);
}
static void ktti_read_block(struct pi_adapter *pi, char *buf, int count)
{
int k, a, b;
for (k = 0; k < count / 2; k++) {
w0(0x10); w2(0xb); w2(0xa); w2(9); w2(0xc); w2(9);
a = r1(); w2(0xc); b = r1(); w2(9);
buf[2*k] = j44(a, b);
a = r1(); w2(0xc); b = r1(); w2(9);
buf[2*k+1] = j44(a, b);
}
}
static void ktti_write_block(struct pi_adapter *pi, char *buf, int count)
{
int k;
for (k = 0; k < count / 2; k++) {
w0(0x10); w2(0xb); w2(0xa); w2(3); w2(6);
w0(buf[2 * k]); w2(3);
w0(buf[2 * k + 1]); w2(6);
w2(0xb);
}
}
static void ktti_connect(struct pi_adapter *pi)
{
pi->saved_r0 = r0();
pi->saved_r2 = r2();
w2(0xb); w2(0xa); w0(0); w2(3); w2(6);
}
static void ktti_disconnect(struct pi_adapter *pi)
{
w2(0xb); w2(0xa); w0(0xa0); w2(3); w2(4);
w0(pi->saved_r0);
w2(pi->saved_r2);
}
static void ktti_log_adapter(struct pi_adapter *pi)
{
dev_info(&pi->dev, "KT adapter at 0x%x, delay %d\n",
pi->port, pi->delay);
}
static struct pi_protocol ktti = {
.owner = THIS_MODULE,
.name = "ktti",
.max_mode = 1,
.epp_first = 2,
.default_delay = 1,
.max_units = 1,
.write_regr = ktti_write_regr,
.read_regr = ktti_read_regr,
.write_block = ktti_write_block,
.read_block = ktti_read_block,
.connect = ktti_connect,
.disconnect = ktti_disconnect,
.log_adapter = ktti_log_adapter,
};
MODULE_LICENSE("GPL");
module_pata_parport_driver(ktti);
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