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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* (c) 1997-1998 Grant R. Guenther <grant@torque.net>
*
* on26.c is a low-level protocol driver for the
* OnSpec 90c26 parallel to IDE adapter chip.
*/
#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, 8-bit writes
* 1 8-bit reads and writes
* 2 8-bit EPP mode
* 3 EPP-16
* 4 EPP-32
*/
#define j44(a, b) (((a >> 4) & 0x0f) | (b & 0xf0))
#define P1 \
do { \
w2(5); w2(0xd); w2(5); w2(0xd); w2(5); w2(4); \
} while (0)
#define P2 \
do { \
w2(5); w2(7); w2(5); w2(4); \
} while (0)
/*
* cont = 0 - access the IDE register file
* cont = 1 - access the IDE command set
*/
static int on26_read_regr(struct pi_adapter *pi, int cont, int regr)
{
int a, b, r;
r = (regr << 2) + 1 + cont;
switch (pi->mode) {
case 0:
w0(1); P1; w0(r); P2; w0(0); P1;
w2(6); a = r1(); w2(4);
w2(6); b = r1(); w2(4);
w2(6); w2(4); w2(6); w2(4);
return j44(a, b);
case 1:
w0(1); P1; w0(r); P2; w0(0); P1;
w2(0x26); a = r0(); w2(4); w2(0x26); w2(4);
return a;
case 2:
case 3:
case 4:
w3(1); w3(1); w2(5); w4(r); w2(4);
w3(0); w3(0); w2(0x24); a = r4(); w2(4);
w2(0x24); (void)r4(); w2(4);
return a;
}
return -1;
}
static void on26_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
{
int r = (regr << 2) + 1 + cont;
switch (pi->mode) {
case 0:
case 1:
w0(1); P1; w0(r); P2; w0(0); P1;
w0(val); P2; w0(val); P2;
break;
case 2:
case 3:
case 4:
w3(1); w3(1); w2(5); w4(r); w2(4);
w3(0); w3(0);
w2(5); w4(val); w2(4);
w2(5); w4(val); w2(4);
break;
}
}
#define CCP(x) \
do { \
w0(0xfe); w0(0xaa); w0(0x55); w0(0); \
w0(0xff); w0(0x87); w0(0x78); w0(x); \
w2(4); w2(5); w2(4); w0(0xff); \
} while (0)
static void on26_connect(struct pi_adapter *pi)
{
int x;
pi->saved_r0 = r0();
pi->saved_r2 = r2();
CCP(0x20);
if (pi->mode)
x = 9;
else
x = 8;
w0(2); P1; w0(8); P2;
w0(2); P1; w0(x); P2;
}
static void on26_disconnect(struct pi_adapter *pi)
{
if (pi->mode >= 2) {
w3(4); w3(4); w3(4); w3(4);
} else {
w0(4); P1; w0(4); P1;
}
CCP(0x30);
w0(pi->saved_r0);
w2(pi->saved_r2);
}
#define RESET_WAIT 200
/* hard reset */
static int on26_test_port(struct pi_adapter *pi)
{
int i, m, d, x = 0, y = 0;
pi->saved_r0 = r0();
pi->saved_r2 = r2();
d = pi->delay;
m = pi->mode;
pi->delay = 5;
pi->mode = 0;
w2(0xc);
CCP(0x30); CCP(0);
w0(0xfe); w0(0xaa); w0(0x55); w0(0); w0(0xff);
i = ((r1() & 0xf0) << 4); w0(0x87);
i |= (r1() & 0xf0); w0(0x78);
w0(0x20); w2(4); w2(5);
i |= ((r1() & 0xf0) >> 4);
w2(4); w0(0xff);
if (i == 0xb5f) {
w0(2); P1; w0(0); P2;
w0(3); P1; w0(0); P2;
w0(2); P1; w0(8); P2; udelay(100);
w0(2); P1; w0(0xa); P2; udelay(100);
w0(2); P1; w0(8); P2; udelay(1000);
on26_write_regr(pi, 0, 6, 0xa0);
for (i = 0; i < RESET_WAIT; i++) {
on26_write_regr(pi, 0, 6, 0xa0);
x = on26_read_regr(pi, 0, 7);
on26_write_regr(pi, 0, 6, 0xb0);
y = on26_read_regr(pi, 0, 7);
if (!((x & 0x80) || (y & 0x80)))
break;
mdelay(100);
}
if (i == RESET_WAIT)
dev_err(&pi->dev,
"on26: Device reset failed (%x,%x)\n", x, y);
w0(4); P1; w0(4); P1;
}
CCP(0x30);
pi->delay = d;
pi->mode = m;
w0(pi->saved_r0);
w2(pi->saved_r2);
return 5;
}
static void on26_read_block(struct pi_adapter *pi, char *buf, int count)
{
int k, a, b;
switch (pi->mode) {
case 0:
w0(1); P1; w0(1); P2; w0(2); P1; w0(0x18); P2; w0(0); P1;
udelay(10);
for (k = 0; k < count; k++) {
w2(6); a = r1();
w2(4); b = r1();
buf[k] = j44(a, b);
}
w0(2); P1; w0(8); P2;
break;
case 1:
w0(1); P1; w0(1); P2; w0(2); P1; w0(0x19); P2; w0(0); P1;
udelay(10);
for (k = 0; k < count / 2; k++) {
w2(0x26); buf[2 * k] = r0();
w2(0x24); buf[2 * k + 1] = r0();
}
w0(2); P1; w0(9); P2;
break;
case 2:
w3(1); w3(1); w2(5); w4(1); w2(4);
w3(0); w3(0); w2(0x24);
udelay(10);
for (k = 0; k < count; k++)
buf[k] = r4();
w2(4);
break;
case 3:
w3(1); w3(1); w2(5); w4(1); w2(4);
w3(0); w3(0); w2(0x24);
udelay(10);
for (k = 0; k < count / 2; k++)
((u16 *)buf)[k] = r4w();
w2(4);
break;
case 4:
w3(1); w3(1); w2(5); w4(1); w2(4);
w3(0); w3(0); w2(0x24);
udelay(10);
for (k = 0; k < count / 4; k++)
((u32 *)buf)[k] = r4l();
w2(4);
break;
}
}
static void on26_write_block(struct pi_adapter *pi, char *buf, int count)
{
int k;
switch (pi->mode) {
case 0:
case 1:
w0(1); P1; w0(1); P2;
w0(2); P1; w0(0x18 + pi->mode); P2; w0(0); P1;
udelay(10);
for (k = 0; k < count / 2; k++) {
w2(5); w0(buf[2 * k]);
w2(7); w0(buf[2 * k + 1]);
}
w2(5); w2(4);
w0(2); P1; w0(8 + pi->mode); P2;
break;
case 2:
w3(1); w3(1); w2(5); w4(1); w2(4);
w3(0); w3(0); w2(0xc5);
udelay(10);
for (k = 0; k < count; k++)
w4(buf[k]);
w2(0xc4);
break;
case 3:
w3(1); w3(1); w2(5); w4(1); w2(4);
w3(0); w3(0); w2(0xc5);
udelay(10);
for (k = 0; k < count / 2; k++)
w4w(((u16 *)buf)[k]);
w2(0xc4);
break;
case 4:
w3(1); w3(1); w2(5); w4(1); w2(4);
w3(0); w3(0); w2(0xc5);
udelay(10);
for (k = 0; k < count / 4; k++)
w4l(((u32 *)buf)[k]);
w2(0xc4);
break;
}
}
static void on26_log_adapter(struct pi_adapter *pi)
{
char *mode_string[5] = { "4-bit", "8-bit", "EPP-8", "EPP-16", "EPP-32" };
dev_info(&pi->dev,
"OnSpec 90c26 at 0x%x, mode %d (%s), delay %d\n",
pi->port, pi->mode, mode_string[pi->mode], pi->delay);
}
static struct pi_protocol on26 = {
.owner = THIS_MODULE,
.name = "on26",
.max_mode = 5,
.epp_first = 2,
.default_delay = 1,
.max_units = 1,
.write_regr = on26_write_regr,
.read_regr = on26_read_regr,
.write_block = on26_write_block,
.read_block = on26_read_block,
.connect = on26_connect,
.disconnect = on26_disconnect,
.test_port = on26_test_port,
.log_adapter = on26_log_adapter,
};
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>");
MODULE_DESCRIPTION("Onspec 90c26 parallel port IDE adapter protocol driver");
module_pata_parport_driver(on26);
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