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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* (c) 1997-1998 Grant R. Guenther <grant@torque.net>
*
* dstr.c is a low-level protocol driver for the DataStor EP2000 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 >> 3) & 0x07) | ((~a >> 4) & 0x08) | \
((b << 1) & 0x70) | ((~b) & 0x80))
#define P1 w2(5);w2(0xd);w2(5);w2(4);
#define P2 w2(5);w2(7);w2(5);w2(4);
#define P3 w2(6);w2(4);w2(6);w2(4);
/*
* cont = 0 - access the IDE register file
* cont = 1 - access the IDE command set
*/
static int cont_map[2] = { 0x20, 0x40 };
static int dstr_read_regr(struct pi_adapter *pi, int cont, int regr)
{
int a, b, r;
r = regr + cont_map[cont];
w0(0x81); P1;
if (pi->mode)
w0(0x11);
else
w0(1);
P2; w0(r); P1;
switch (pi->mode) {
case 0:
w2(6); a = r1(); w2(4); w2(6); b = r1(); w2(4);
return j44(a, b);
case 1:
w0(0); w2(0x26); a = r0(); w2(4);
return a;
case 2:
case 3:
case 4:
w2(0x24); a = r4(); w2(4);
return a;
}
return -1;
}
static void dstr_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
{
int r = regr + cont_map[cont];
w0(0x81); P1;
if (pi->mode >= 2)
w0(0x11);
else
w0(1);
P2; w0(r); P1;
switch (pi->mode) {
case 0:
case 1:
w0(val); w2(5); w2(7); w2(5); w2(4);
break;
case 2:
case 3:
case 4:
w4(val);
break;
}
}
#define CCP(x) \
do { \
w0(0xff); w2(0xc); w2(4); \
w0(0xaa); w0(0x55); w0(0); w0(0xff); \
w0(0x87); w0(0x78); \
w0(x); w2(5); w2(4); \
} while (0)
static void dstr_connect(struct pi_adapter *pi)
{
pi->saved_r0 = r0();
pi->saved_r2 = r2();
w2(4); CCP(0xe0); w0(0xff);
}
static void dstr_disconnect(struct pi_adapter *pi)
{
CCP(0x30);
w0(pi->saved_r0);
w2(pi->saved_r2);
}
static void dstr_read_block(struct pi_adapter *pi, char *buf, int count)
{
int k, a, b;
w0(0x81); P1;
if (pi->mode)
w0(0x19);
else
w0(9);
P2; w0(0x82); P1; P3; w0(0x20); P1;
switch (pi->mode) {
case 0:
for (k = 0; k < count; k++) {
w2(6); a = r1(); w2(4);
w2(6); b = r1(); w2(4);
buf[k] = j44(a, b);
}
break;
case 1:
w0(0);
for (k = 0; k < count; k++) {
w2(0x26);
buf[k] = r0();
w2(0x24);
}
w2(4);
break;
case 2:
w2(0x24);
for (k = 0; k < count; k++)
buf[k] = r4();
w2(4);
break;
case 3:
w2(0x24);
for (k = 0; k < count / 2; k++)
((u16 *)buf)[k] = r4w();
w2(4);
break;
case 4:
w2(0x24);
for (k = 0; k < count / 4; k++)
((u32 *)buf)[k] = r4l();
w2(4);
break;
}
}
static void dstr_write_block(struct pi_adapter *pi, char *buf, int count)
{
int k;
w0(0x81); P1;
if (pi->mode)
w0(0x19);
else
w0(9);
P2; w0(0x82); P1; P3; w0(0x20); P1;
switch (pi->mode) {
case 0:
case 1:
for (k = 0; k < count; k++) {
w2(5);
w0(buf[k]);
w2(7);
}
w2(5); w2(4);
break;
case 2:
w2(0xc5);
for (k = 0; k < count; k++)
w4(buf[k]);
w2(0xc4);
break;
case 3:
w2(0xc5);
for (k = 0; k < count / 2; k++)
w4w(((u16 *)buf)[k]);
w2(0xc4);
break;
case 4:
w2(0xc5);
for (k = 0; k < count / 4; k++)
w4l(((u32 *)buf)[k]);
w2(0xc4);
break;
}
}
static void dstr_log_adapter(struct pi_adapter *pi)
{
char *mode_string[5] = { "4-bit", "8-bit", "EPP-8", "EPP-16", "EPP-32" };
dev_info(&pi->dev,
"DataStor EP2000 at 0x%x, mode %d (%s), delay %d\n",
pi->port, pi->mode, mode_string[pi->mode], pi->delay);
}
static struct pi_protocol dstr = {
.owner = THIS_MODULE,
.name = "dstr",
.max_mode = 5,
.epp_first = 2,
.default_delay = 1,
.max_units = 1,
.write_regr = dstr_write_regr,
.read_regr = dstr_read_regr,
.write_block = dstr_write_block,
.read_block = dstr_read_block,
.connect = dstr_connect,
.disconnect = dstr_disconnect,
.log_adapter = dstr_log_adapter,
};
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>");
MODULE_DESCRIPTION("DataStor EP2000 parallel port IDE adapter protocol driver");
module_pata_parport_driver(dstr);
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