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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* (c) 1996-1998 Grant R. Guenther <grant@torque.net>
*
* on20.c is a low-level protocol driver for the
* Onspec 90c20 parallel to IDE adapter.
*/
#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 op(f) \
do { \
w2(4); w0(f); w2(5); w2(0xd); \
w2(5); w2(0xd); w2(5); w2(4); \
} while (0)
#define vl(v) \
do { \
w2(4); w0(v); w2(5); \
w2(7); w2(5); w2(4); \
} while (0)
#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 on20_read_regr(struct pi_adapter *pi, int cont, int regr)
{
int h, l, r;
r = (regr << 2) + 1 + cont;
op(1); vl(r); op(0);
switch (pi->mode) {
case 0:
w2(4); w2(6); l = r1();
w2(4); w2(6); h = r1();
w2(4); w2(6); w2(4); w2(6); w2(4);
return j44(l, h);
case 1:
w2(4); w2(0x26); r = r0();
w2(4); w2(0x26); w2(4);
return r;
}
return -1;
}
static void on20_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
{
int r = (regr << 2) + 1 + cont;
op(1); vl(r);
op(0); vl(val);
op(0); vl(val);
}
static void on20_connect(struct pi_adapter *pi)
{
pi->saved_r0 = r0();
pi->saved_r2 = r2();
w2(4); w0(0); w2(0xc); w2(4); w2(6); w2(4); w2(6); w2(4);
if (pi->mode) {
op(2); vl(8); op(2); vl(9);
} else {
op(2); vl(0); op(2); vl(8);
}
}
static void on20_disconnect(struct pi_adapter *pi)
{
w2(4); w0(7); w2(4); w2(0xc); w2(4);
w0(pi->saved_r0);
w2(pi->saved_r2);
}
static void on20_read_block(struct pi_adapter *pi, char *buf, int count)
{
int k, l, h;
op(1); vl(1); op(0);
for (k = 0; k < count; k++) {
if (pi->mode) {
w2(4); w2(0x26); buf[k] = r0();
} else {
w2(6); l = r1(); w2(4);
w2(6); h = r1(); w2(4);
buf[k] = j44(l, h);
}
}
w2(4);
}
static void on20_write_block(struct pi_adapter *pi, char *buf, int count)
{
int k;
op(1); vl(1); op(0);
for (k = 0; k < count; k++) {
w2(5); w0(buf[k]); w2(7);
}
w2(4);
}
static void on20_log_adapter(struct pi_adapter *pi)
{
char *mode_string[2] = { "4-bit", "8-bit" };
dev_info(&pi->dev,
"OnSpec 90c20 at 0x%x, mode %d (%s), delay %d\n",
pi->port, pi->mode, mode_string[pi->mode], pi->delay);
}
static struct pi_protocol on20 = {
.owner = THIS_MODULE,
.name = "on20",
.max_mode = 2,
.epp_first = 2,
.default_delay = 1,
.max_units = 1,
.write_regr = on20_write_regr,
.read_regr = on20_read_regr,
.write_block = on20_write_block,
.read_block = on20_read_block,
.connect = on20_connect,
.disconnect = on20_disconnect,
.log_adapter = on20_log_adapter,
};
MODULE_LICENSE("GPL");
module_pata_parport_driver(on20);
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