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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* (c) 1997-1998 Grant R. Guenther <grant@torque.net>
*
* This is a low-level driver for the KBIC-951A and KBIC-971A
* parallel to IDE adapter chips from KingByte Information Systems.
*
* The chips are almost identical, however, the wakeup code
* required for the 971A interferes with the correct operation of
* the 951A, so this driver registers itself twice, once for
* each 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"
#define r12w() (delay_p, inw(pi->port + 1) & 0xffff)
#define j44(a, b) ((((a >> 4) & 0x0f) | (b & 0xf0)) ^ 0x88)
#define j53(w) (((w >> 3) & 0x1f) | ((w >> 4) & 0xe0))
/*
* cont = 0 - access the IDE register file
* cont = 1 - access the IDE command set
*/
static int cont_map[2] = { 0x80, 0x40 };
static int kbic_read_regr(struct pi_adapter *pi, int cont, int regr)
{
int a, b, s;
s = cont_map[cont];
switch (pi->mode) {
case 0:
w0(regr | 0x18 | s); w2(4); w2(6); w2(4); w2(1); w0(8);
a = r1(); w0(0x28); b = r1(); w2(4);
return j44(a, b);
case 1:
w0(regr|0x38 | s); w2(4); w2(6); w2(4); w2(5); w0(8);
a = r12w(); w2(4);
return j53(a);
case 2:
w0(regr | 0x08 | s); w2(4); w2(6); w2(4); w2(0xa5); w2(0xa1);
a = r0(); w2(4);
return a;
case 3:
case 4:
case 5:
w0(0x20 | s); w2(4); w2(6); w2(4); w3(regr);
a = r4(); b = r4(); w2(4); w2(0); w2(4);
return a;
}
return -1;
}
static void kbic_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
{
int s = cont_map[cont];
switch (pi->mode) {
case 0:
case 1:
case 2:
w0(regr | 0x10 | s); w2(4); w2(6); w2(4);
w0(val); w2(5); w2(4);
break;
case 3:
case 4:
case 5:
w0(0x20 | s); w2(4); w2(6); w2(4); w3(regr);
w4(val); w4(val);
w2(4); w2(0); w2(4);
break;
}
}
static void k951_connect(struct pi_adapter *pi)
{
pi->saved_r0 = r0();
pi->saved_r2 = r2();
w2(4);
}
static void k951_disconnect(struct pi_adapter *pi)
{
w0(pi->saved_r0);
w2(pi->saved_r2);
}
#define CCP(x) \
do { \
w2(0xc4); w0(0xaa); w0(0x55); \
w0(0); w0(0xff); w0(0x87); \
w0(0x78); w0(x); w2(0xc5); \
w2(0xc4); w0(0xff); \
} while (0)
static void k971_connect(struct pi_adapter *pi)
{
pi->saved_r0 = r0();
pi->saved_r2 = r2();
CCP(0x20);
w2(4);
}
static void k971_disconnect(struct pi_adapter *pi)
{
CCP(0x30);
w0(pi->saved_r0);
w2(pi->saved_r2);
}
/*
* count must be congruent to 0 MOD 4, but all known applications
*have this property.
*/
static void kbic_read_block(struct pi_adapter *pi, char *buf, int count)
{
int k, a, b;
switch (pi->mode) {
case 0:
w0(0x98); w2(4); w2(6); w2(4);
for (k = 0; k < count / 2; k++) {
w2(1); w0(8);
a = r1();
w0(0x28);
b = r1();
buf[2 * k] = j44(a, b);
w2(5);
b = r1();
w0(8);
a = r1();
buf[2 * k + 1] = j44(a, b);
w2(4);
}
break;
case 1:
w0(0xb8); w2(4); w2(6); w2(4);
for (k = 0; k < count / 4; k++) {
w0(0xb8);
w2(4); w2(5);
w0(8);
buf[4 * k] = j53(r12w());
w0(0xb8);
buf[4 * k + 1] = j53(r12w());
w2(4); w2(5);
buf[4 * k + 3] = j53(r12w());
w0(8);
buf[4 * k + 2] = j53(r12w());
}
w2(4);
break;
case 2:
w0(0x88); w2(4); w2(6); w2(4);
for (k = 0; k < count / 2; k++) {
w2(0xa0); w2(0xa1);
buf[2 * k] = r0();
w2(0xa5);
buf[2 * k + 1] = r0();
}
w2(4);
break;
case 3:
w0(0xa0); w2(4); w2(6); w2(4); w3(0);
for (k = 0; k < count; k++)
buf[k] = r4();
w2(4); w2(0); w2(4);
break;
case 4:
w0(0xa0); w2(4); w2(6); w2(4); w3(0);
for (k = 0; k < count / 2; k++)
((u16 *)buf)[k] = r4w();
w2(4); w2(0); w2(4);
break;
case 5:
w0(0xa0); w2(4); w2(6); w2(4); w3(0);
for (k = 0; k < count / 4; k++)
((u32 *)buf)[k] = r4l();
w2(4); w2(0); w2(4);
break;
}
}
static void kbic_write_block(struct pi_adapter *pi, char *buf, int count)
{
int k;
switch (pi->mode) {
case 0:
case 1:
case 2:
w0(0x90); w2(4); w2(6); w2(4);
for (k = 0; k < count / 2; k++) {
w0(buf[2 * k + 1]);
w2(0); w2(4);
w0(buf[2 * k]);
w2(5); w2(4);
}
break;
case 3:
w0(0xa0); w2(4); w2(6); w2(4); w3(0);
for (k = 0; k < count / 2; k++) {
w4(buf[2 * k + 1]);
w4(buf[2 * k]);
}
w2(4); w2(0); w2(4);
break;
case 4:
w0(0xa0); w2(4); w2(6); w2(4); w3(0);
for (k = 0; k < count / 2; k++)
w4w(swab16(((u16 *)buf)[k]));
w2(4); w2(0); w2(4);
break;
case 5:
w0(0xa0); w2(4); w2(6); w2(4); w3(0);
for (k = 0; k < count / 4; k++)
w4l(swab16(((u16 *)buf)[2 * k]) |
swab16(((u16 *)buf)[2 * k + 1]) << 16);
w2(4); w2(0); w2(4);
break;
}
}
static void kbic_log_adapter(struct pi_adapter *pi, char *chip)
{
char *mode[6] = { "4-bit", "5/3", "8-bit", "EPP-8", "EPP_16", "EPP-32"};
dev_info(&pi->dev, "KingByte %s at 0x%x, mode %d (%s), delay %d\n",
chip, pi->port, pi->mode, mode[pi->mode], pi->delay);
}
static void k951_log_adapter(struct pi_adapter *pi)
{
kbic_log_adapter(pi, "KBIC-951A");
}
static void k971_log_adapter(struct pi_adapter *pi)
{
kbic_log_adapter(pi, "KBIC-971A");
}
static struct pi_protocol k951 = {
.owner = THIS_MODULE,
.name = "k951",
.max_mode = 6,
.epp_first = 3,
.default_delay = 1,
.max_units = 1,
.write_regr = kbic_write_regr,
.read_regr = kbic_read_regr,
.write_block = kbic_write_block,
.read_block = kbic_read_block,
.connect = k951_connect,
.disconnect = k951_disconnect,
.log_adapter = k951_log_adapter,
};
static struct pi_protocol k971 = {
.owner = THIS_MODULE,
.name = "k971",
.max_mode = 6,
.epp_first = 3,
.default_delay = 1,
.max_units = 1,
.write_regr = kbic_write_regr,
.read_regr = kbic_read_regr,
.write_block = kbic_write_block,
.read_block = kbic_read_block,
.connect = k971_connect,
.disconnect = k971_disconnect,
.log_adapter = k971_log_adapter,
};
static int __init kbic_init(void)
{
int rv;
rv = pata_parport_register_driver(&k951);
if (rv < 0)
return rv;
rv = pata_parport_register_driver(&k971);
if (rv < 0)
pata_parport_unregister_driver(&k951);
return rv;
}
static void __exit kbic_exit(void)
{
pata_parport_unregister_driver(&k951);
pata_parport_unregister_driver(&k971);
}
MODULE_LICENSE("GPL");
module_init(kbic_init)
module_exit(kbic_exit)
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