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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* (c) 1997-1998 Grant R. Guenther <grant@torque.net>
*
* comm.c is a low-level protocol driver for some older models of the DataStor
* "Commuter" parallel to IDE adapter. Some of the parallel port devices
* marketed by Arista currently use this 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"
/*
* mode codes: 0 nybble reads, 8-bit writes
* 1 8-bit reads and writes
* 2 8-bit EPP mode
*/
#define j44(a, b) (((a >> 3) & 0x0f) | ((b << 1) & 0xf0))
#define P1 w2(5);w2(0xd);w2(0xd);w2(5);w2(4);
#define P2 w2(5);w2(7);w2(7);w2(5);w2(4);
/*
* cont = 0 - access the IDE register file
* cont = 1 - access the IDE command set
*/
static int cont_map[2] = { 0x08, 0x10 };
static int comm_read_regr(struct pi_adapter *pi, int cont, int regr)
{
int l, h, r;
r = regr + cont_map[cont];
switch (pi->mode) {
case 0:
w0(r); P1; w0(0);
w2(6); l = r1(); w0(0x80); h = r1(); w2(4);
return j44(l, h);
case 1:
w0(r+0x20); P1;
w0(0); w2(0x26); h = r0(); w2(4);
return h;
case 2:
case 3:
case 4:
w3(r+0x20); (void)r1();
w2(0x24); h = r4(); w2(4);
return h;
}
return -1;
}
static void comm_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
{
int r = regr + cont_map[cont];
switch (pi->mode) {
case 0:
case 1:
w0(r); P1; w0(val); P2;
break;
case 2:
case 3:
case 4:
w3(r); (void)r1(); w4(val);
break;
}
}
static void comm_connect(struct pi_adapter *pi)
{
pi->saved_r0 = r0();
pi->saved_r2 = r2();
w2(4); w0(0xff); w2(6);
w2(4); w0(0xaa); w2(6);
w2(4); w0(0x00); w2(6);
w2(4); w0(0x87); w2(6);
w2(4); w0(0xe0); w2(0xc); w2(0xc); w2(4);
}
static void comm_disconnect(struct pi_adapter *pi)
{
w2(0); w2(0); w2(0); w2(4);
w0(pi->saved_r0);
w2(pi->saved_r2);
}
static void comm_read_block(struct pi_adapter *pi, char *buf, int count)
{
int i, l, h;
switch (pi->mode) {
case 0:
w0(0x48); P1;
for (i = 0; i < count; i++) {
w0(0); w2(6); l = r1();
w0(0x80); h = r1(); w2(4);
buf[i] = j44(l, h);
}
break;
case 1:
w0(0x68); P1; w0(0);
for (i = 0; i < count; i++) {
w2(0x26);
buf[i] = r0();
w2(0x24);
}
w2(4);
break;
case 2:
w3(0x68); (void)r1(); w2(0x24);
for (i = 0; i < count; i++)
buf[i] = r4();
w2(4);
break;
case 3:
w3(0x68); (void)r1(); w2(0x24);
for (i = 0; i < count / 2; i++)
((u16 *)buf)[i] = r4w();
w2(4);
break;
case 4:
w3(0x68); (void)r1(); w2(0x24);
for (i = 0; i < count / 4; i++)
((u32 *)buf)[i] = r4l();
w2(4);
break;
}
}
/* NB: Watch out for the byte swapped writes ! */
static void comm_write_block(struct pi_adapter *pi, char *buf, int count)
{
int k;
switch (pi->mode) {
case 0:
case 1:
w0(0x68); P1;
for (k = 0; k < count; k++) {
w2(5);
w0(buf[k ^ 1]);
w2(7);
}
w2(5); w2(4);
break;
case 2:
w3(0x48); (void)r1();
for (k = 0; k < count; k++)
w4(buf[k ^ 1]);
break;
case 3:
w3(0x48); (void)r1();
for (k = 0; k < count / 2; k++)
w4w(swab16(((u16 *)buf)[k]));
break;
case 4:
w3(0x48); (void)r1();
for (k = 0; k < count / 4; k++)
w4l(swab16(((u16 *)buf)[2 * k]) |
swab16(((u16 *)buf)[2 * k + 1]) << 16);
break;
}
}
static void comm_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 Commuter at 0x%x, mode %d (%s), delay %d\n",
pi->port, pi->mode, mode_string[pi->mode], pi->delay);
}
static struct pi_protocol comm = {
.owner = THIS_MODULE,
.name = "comm",
.max_mode = 5,
.epp_first = 2,
.default_delay = 1,
.max_units = 1,
.write_regr = comm_write_regr,
.read_regr = comm_read_regr,
.write_block = comm_write_block,
.read_block = comm_read_block,
.connect = comm_connect,
.disconnect = comm_disconnect,
.log_adapter = comm_log_adapter,
};
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>");
MODULE_DESCRIPTION("DataStor Commuter parallel port IDE adapter protocol driver");
module_pata_parport_driver(comm);
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